cpython-lru_cache-weakref: Objects/obmalloc.c annotate

annotate Objects/obmalloc.c @ 51330:ca423008fa4a legacy-trunk

#5144: document that PySys_SetArgv prepends the script directory (or the empty string) to sys.path.

author	Georg Brandl <georg@python.org>
date	Thu, 05 Feb 2009 10:37:07 +0000
parents	9d1c531168ca
children	e38335d4df91 ab49e0ac8c8f

rev	line source
22469 8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1 #include "Python.h"
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	2
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	3 #ifdef WITH_PYMALLOC
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	4
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	5 /* An object allocator for Python.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	6
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	7 Here is an introduction to the layers of the Python memory architecture,
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	8 showing where the object allocator is actually used (layer +2), It is
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	9 called for every object allocation and deallocation (PyObject_New/Del),
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	10 unless the object-specific allocators implement a proprietary allocation
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	11 scheme (ex.: ints use a simple free list). This is also the place where
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	12 the cyclic garbage collector operates selectively on container objects.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	13
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	14
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	15 Object-specific allocators
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	16 _____ ______ ______ ________
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	17 [ int ] [ dict ] [ list ] ... [ string ] Python core \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	18 +3 \| <----- Object-specific memory -----> \| <-- Non-object memory --> \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	19 _______________________________ \| \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	20 [ Python's object allocator ] \| \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	21 +2 \| ####### Object memory ####### \| <------ Internal buffers ------> \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	22 ______________________________________________________________ \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	23 [ Python's raw memory allocator (PyMem_ API) ] \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	24 +1 \| <----- Python memory (under PyMem manager's control) ------> \| \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	25 __________________________________________________________________
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	26 [ Underlying general-purpose allocator (ex: C library malloc) ]
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	27 0 \| <------ Virtual memory allocated for the python process -------> \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	28
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	29 =========================================================================
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	30 _______________________________________________________________________
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	31 [ OS-specific Virtual Memory Manager (VMM) ]
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	32 -1 \| <--- Kernel dynamic storage allocation & management (page-based) ---> \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	33 __________________________________ __________________________________
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	34 [ ] [ ]
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	35 -2 \| <-- Physical memory: ROM/RAM --> \| \| <-- Secondary storage (swap) --> \|
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	36
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	37 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	38 /==========================================================================/
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	39
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	40 /* A fast, special-purpose memory allocator for small blocks, to be used
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	41 on top of a general-purpose malloc -- heavily based on previous art. */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	42
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	43 /* Vladimir Marangozov -- August 2000 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	44
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	45 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	46 * "Memory management is where the rubber meets the road -- if we do the wrong
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	47 * thing at any level, the results will not be good. And if we don't make the
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	48 * levels work well together, we are in serious trouble." (1)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	49 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	50 * (1) Paul R. Wilson, Mark S. Johnstone, Michael Neely, and David Boles,
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	51 * "Dynamic Storage Allocation: A Survey and Critical Review",
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	52 * in Proc. 1995 Int'l. Workshop on Memory Management, September 1995.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	53 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	54
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	55 /* #undef WITH_MEMORY_LIMITS / / disable mem limit checks */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	56
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	57 /==========================================================================/
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	58
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	59 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	60 * Allocation strategy abstract:
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	61 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	62 * For small requests, the allocator sub-allocates <Big> blocks of memory.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	63 * Requests greater than 256 bytes are routed to the system's allocator.
22470 0e4758ccfe2b Just whitespace fiddling. Tim Peters <tim.peters@gmail.com> parents: 22469 diff changeset	64 *
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	65 * Small requests are grouped in size classes spaced 8 bytes apart, due
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	66 * to the required valid alignment of the returned address. Requests of
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	67 * a particular size are serviced from memory pools of 4K (one VMM page).
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	68 * Pools are fragmented on demand and contain free lists of blocks of one
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	69 * particular size class. In other words, there is a fixed-size allocator
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	70 * for each size class. Free pools are shared by the different allocators
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	71 * thus minimizing the space reserved for a particular size class.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	72 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	73 * This allocation strategy is a variant of what is known as "simple
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	74 * segregated storage based on array of free lists". The main drawback of
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	75 * simple segregated storage is that we might end up with lot of reserved
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	76 * memory for the different free lists, which degenerate in time. To avoid
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	77 * this, we partition each free list in pools and we share dynamically the
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	78 * reserved space between all free lists. This technique is quite efficient
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	79 * for memory intensive programs which allocate mainly small-sized blocks.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	80 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	81 * For small requests we have the following table:
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	82 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	83 * Request in bytes Size of allocated block Size class idx
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	84 * ----------------------------------------------------------------
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	85 * 1-8 8 0
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	86 * 9-16 16 1
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	87 * 17-24 24 2
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	88 * 25-32 32 3
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	89 * 33-40 40 4
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	90 * 41-48 48 5
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	91 * 49-56 56 6
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	92 * 57-64 64 7
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	93 * 65-72 72 8
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	94 * ... ... ...
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	95 * 241-248 248 30
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	96 * 249-256 256 31
22470 0e4758ccfe2b Just whitespace fiddling. Tim Peters <tim.peters@gmail.com> parents: 22469 diff changeset	97 *
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	98 * 0, 257 and up: routed to the underlying allocator.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	99 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	100
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	101 /==========================================================================/
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	102
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	103 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	104 * -- Main tunable settings section --
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	105 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	106
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	107 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	108 * Alignment of addresses returned to the user. 8-bytes alignment works
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	109 * on most current architectures (with 32-bit or 64-bit address busses).
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	110 * The alignment value is also used for grouping small requests in size
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	111 * classes spaced ALIGNMENT bytes apart.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	112 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	113 * You shouldn't change this unless you know what you are doing.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	114 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	115 #define ALIGNMENT 8 /* must be 2^N */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	116 #define ALIGNMENT_SHIFT 3
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	117 #define ALIGNMENT_MASK (ALIGNMENT - 1)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	118
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	119 /* Return the number of bytes in size class I, as a uint. */
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	120 #define INDEX2SIZE(I) (((uint)(I) + 1) << ALIGNMENT_SHIFT)
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	121
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	122 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	123 * Max size threshold below which malloc requests are considered to be
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	124 * small enough in order to use preallocated memory pools. You can tune
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	125 * this value according to your application behaviour and memory needs.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	126 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	127 * The following invariants must hold:
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	128 * 1) ALIGNMENT <= SMALL_REQUEST_THRESHOLD <= 256
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	129 * 2) SMALL_REQUEST_THRESHOLD is evenly divisible by ALIGNMENT
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	130 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	131 * Although not required, for better performance and space efficiency,
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	132 * it is recommended that SMALL_REQUEST_THRESHOLD is set to a power of 2.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	133 */
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	134 #define SMALL_REQUEST_THRESHOLD 256
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	135 #define NB_SMALL_SIZE_CLASSES (SMALL_REQUEST_THRESHOLD / ALIGNMENT)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	136
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	137 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	138 * The system's VMM page size can be obtained on most unices with a
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	139 * getpagesize() call or deduced from various header files. To make
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	140 * things simpler, we assume that it is 4K, which is OK for most systems.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	141 * It is probably better if this is the native page size, but it doesn't
35222 8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	142 * have to be. In theory, if SYSTEM_PAGE_SIZE is larger than the native page
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	143 * size, then `POOL_ADDR(p)->arenaindex' could rarely cause a segmentation
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	144 * violation fault. 4K is apparently OK for all the platforms that python
25928 75756c8558bd Patch #627105: Document that SYSTEM_PAGE_SIZE really should not be Martin v. Löwis <martin@v.loewis.de> parents: 25233 diff changeset	145 * currently targets.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	146 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	147 #define SYSTEM_PAGE_SIZE (4 * 1024)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	148 #define SYSTEM_PAGE_SIZE_MASK (SYSTEM_PAGE_SIZE - 1)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	149
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	150 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	151 * Maximum amount of memory managed by the allocator for small requests.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	152 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	153 #ifdef WITH_MEMORY_LIMITS
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	154 #ifndef SMALL_MEMORY_LIMIT
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	155 #define SMALL_MEMORY_LIMIT (64 * 1024 * 1024) /* 64 MB -- more? */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	156 #endif
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	157 #endif
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	158
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	159 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	160 * The allocator sub-allocates <Big> blocks of memory (called arenas) aligned
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	161 * on a page boundary. This is a reserved virtual address space for the
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	162 * current process (obtained through a malloc call). In no way this means
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	163 * that the memory arenas will be used entirely. A malloc(<Big>) is usually
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	164 * an address range reservation for <Big> bytes, unless all pages within this
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	165 * space are referenced subsequently. So malloc'ing big blocks and not using
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	166 * them does not mean "wasting memory". It's an addressable range wastage...
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	167 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	168 * Therefore, allocating arenas with malloc is not optimal, because there is
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	169 * some address space wastage, but this is the most portable way to request
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	170 * memory from the system across various platforms.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	171 */
22686 f8bd930644aa Now that we're no longer linking arenas together, there's no need to Tim Peters <tim.peters@gmail.com> parents: 22685 diff changeset	172 #define ARENA_SIZE (256 << 10) /* 256KB */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	173
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	174 #ifdef WITH_MEMORY_LIMITS
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	175 #define MAX_ARENAS (SMALL_MEMORY_LIMIT / ARENA_SIZE)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	176 #endif
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	177
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	178 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	179 * Size of the pools used for small blocks. Should be a power of 2,
22692 2c02cf278f02 It's once again thought safe to call the pymalloc free/realloc with an Tim Peters <tim.peters@gmail.com> parents: 22691 diff changeset	180 * between 1K and SYSTEM_PAGE_SIZE, that is: 1k, 2k, 4k.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	181 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	182 #define POOL_SIZE SYSTEM_PAGE_SIZE /* must be 2^N */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	183 #define POOL_SIZE_MASK SYSTEM_PAGE_SIZE_MASK
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	184
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	185 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	186 * -- End of tunable settings section --
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	187 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	188
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	189 /==========================================================================/
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	190
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	191 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	192 * Locking
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	193 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	194 * To reduce lock contention, it would probably be better to refine the
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	195 * crude function locking with per size class locking. I'm not positive
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	196 * however, whether it's worth switching to such locking policy because
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	197 * of the performance penalty it might introduce.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	198 *
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	199 * The following macros describe the simplest (should also be the fastest)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	200 * lock object on a particular platform and the init/fini/lock/unlock
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	201 * operations on it. The locks defined here are not expected to be recursive
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	202 * because it is assumed that they will always be called in the order:
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	203 * INIT, [LOCK, UNLOCK]*, FINI.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	204 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	205
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	206 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	207 * Python's threads are serialized, so object malloc locking is disabled.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	208 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	209 #define SIMPLELOCK_DECL(lock) /* simple lock declaration */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	210 #define SIMPLELOCK_INIT(lock) /* allocate (if needed) and initialize */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	211 #define SIMPLELOCK_FINI(lock) /* free/destroy an existing lock */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	212 #define SIMPLELOCK_LOCK(lock) /* acquire released lock */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	213 #define SIMPLELOCK_UNLOCK(lock) /* release acquired lock */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	214
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	215 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	216 * Basic types
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	217 * I don't care if these are defined in <sys/types.h> or elsewhere. Axiom.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	218 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	219 #undef uchar
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	220 #define uchar unsigned char /* assuming == 8 bits */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	221
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	222 #undef uint
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	223 #define uint unsigned int /* assuming >= 16 bits */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	224
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	225 #undef ulong
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	226 #define ulong unsigned long /* assuming >= 32 bits */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	227
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	228 #undef uptr
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	229 #define uptr Py_uintptr_t
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	230
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	231 /* When you say memory, my mind reasons in terms of (pointers to) blocks */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	232 typedef uchar block;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	233
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	234 /* Pool for small blocks. */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	235 struct pool_header {
17030 3ec500403f01 Identifiers matching _[A-Z_]\w* are reserved for C implementations. Tim Peters <tim.peters@gmail.com> parents: 16782 diff changeset	236 union { block *_padding;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	237 uint count; } ref; /* number of allocated blocks */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	238 block freeblock; / pool's free list head */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	239 struct pool_header nextpool; / next pool of this size class */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	240 struct pool_header prevpool; / previous pool "" */
22690 00b2972ab4a4 Changed the #-of-arenas counters to uints -- no need to be insane about Tim Peters <tim.peters@gmail.com> parents: 22687 diff changeset	241 uint arenaindex; /* index into arenas of base adr */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	242 uint szidx; /* block size class index */
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	243 uint nextoffset; /* bytes to virgin block */
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	244 uint maxnextoffset; /* largest valid nextoffset */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	245 };
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	246
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	247 typedef struct pool_header *poolp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	248
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	249 /* Record keeping for arenas. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	250 struct arena_object {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	251 /* The address of the arena, as returned by malloc. Note that 0
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	252 * will never be returned by a successful malloc, and is used
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	253 * here to mark an arena_object that doesn't correspond to an
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	254 * allocated arena.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	255 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	256 uptr address;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	257
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	258 /* Pool-aligned pointer to the next pool to be carved off. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	259 block* pool_address;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	260
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	261 /* The number of available pools in the arena: free pools + never-
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	262 * allocated pools.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	263 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	264 uint nfreepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	265
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	266 /* The total number of pools in the arena, whether or not available. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	267 uint ntotalpools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	268
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	269 /* Singly-linked list of available pools. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	270 struct pool_header* freepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	271
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	272 /* Whenever this arena_object is not associated with an allocated
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	273 * arena, the nextarena member is used to link all unassociated
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	274 * arena_objects in the singly-linked `unused_arena_objects` list.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	275 * The prevarena member is unused in this case.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	276 *
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	277 * When this arena_object is associated with an allocated arena
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	278 * with at least one available pool, both members are used in the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	279 * doubly-linked `usable_arenas` list, which is maintained in
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	280 * increasing order of `nfreepools` values.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	281 *
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	282 * Else this arena_object is associated with an allocated arena
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	283 * all of whose pools are in use. `nextarena` and `prevarena`
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	284 * are both meaningless in this case.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	285 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	286 struct arena_object* nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	287 struct arena_object* prevarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	288 };
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	289
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	290 #undef ROUNDUP
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	291 #define ROUNDUP(x) (((x) + ALIGNMENT_MASK) & ~ALIGNMENT_MASK)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	292 #define POOL_OVERHEAD ROUNDUP(sizeof(struct pool_header))
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	293
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	294 #define DUMMY_SIZE_IDX 0xffff /* size class of newly cached pools */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	295
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	296 /* Round pointer P down to the closest pool-aligned address <= P, as a poolp */
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	297 #define POOL_ADDR(P) ((poolp)((uptr)(P) & ~(uptr)POOL_SIZE_MASK))
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	298
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	299 /* Return total number of blocks in pool of size index I, as a uint. */
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	300 #define NUMBLOCKS(I) ((uint)(POOL_SIZE - POOL_OVERHEAD) / INDEX2SIZE(I))
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	301
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	302 /==========================================================================/
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	303
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	304 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	305 * This malloc lock
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	306 */
24294 0a08ed05bd42 Remove extraneous semicolon. Jeremy Hylton <jeremy@alum.mit.edu> parents: 24177 diff changeset	307 SIMPLELOCK_DECL(_malloc_lock)
17030 3ec500403f01 Identifiers matching _[A-Z_]\w* are reserved for C implementations. Tim Peters <tim.peters@gmail.com> parents: 16782 diff changeset	308 #define LOCK() SIMPLELOCK_LOCK(_malloc_lock)
3ec500403f01 Identifiers matching _[A-Z_]\w* are reserved for C implementations. Tim Peters <tim.peters@gmail.com> parents: 16782 diff changeset	309 #define UNLOCK() SIMPLELOCK_UNLOCK(_malloc_lock)
3ec500403f01 Identifiers matching _[A-Z_]\w* are reserved for C implementations. Tim Peters <tim.peters@gmail.com> parents: 16782 diff changeset	310 #define LOCK_INIT() SIMPLELOCK_INIT(_malloc_lock)
3ec500403f01 Identifiers matching _[A-Z_]\w* are reserved for C implementations. Tim Peters <tim.peters@gmail.com> parents: 16782 diff changeset	311 #define LOCK_FINI() SIMPLELOCK_FINI(_malloc_lock)
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	312
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	313 /*
22697 6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	314 * Pool table -- headed, circular, doubly-linked lists of partially used pools.
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	315
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	316 This is involved. For an index i, usedpools[i+i] is the header for a list of
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	317 all partially used pools holding small blocks with "size class idx" i. So
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	318 usedpools[0] corresponds to blocks of size 8, usedpools[2] to blocks of size
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	319 16, and so on: index 2*i <-> blocks of size (i+1)<<ALIGNMENT_SHIFT.
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	320
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	321 Pools are carved off an arena's highwater mark (an arena_object's pool_address
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	322 member) as needed. Once carved off, a pool is in one of three states forever
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	323 after:
22697 6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	324
22741 771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	325 used == partially used, neither empty nor full
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	326 At least one block in the pool is currently allocated, and at least one
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	327 block in the pool is not currently allocated (note this implies a pool
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	328 has room for at least two blocks).
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	329 This is a pool's initial state, as a pool is created only when malloc
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	330 needs space.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	331 The pool holds blocks of a fixed size, and is in the circular list headed
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	332 at usedpools[i] (see above). It's linked to the other used pools of the
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	333 same size class via the pool_header's nextpool and prevpool members.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	334 If all but one block is currently allocated, a malloc can cause a
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	335 transition to the full state. If all but one block is not currently
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	336 allocated, a free can cause a transition to the empty state.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	337
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	338 full == all the pool's blocks are currently allocated
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	339 On transition to full, a pool is unlinked from its usedpools[] list.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	340 It's not linked to from anything then anymore, and its nextpool and
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	341 prevpool members are meaningless until it transitions back to used.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	342 A free of a block in a full pool puts the pool back in the used state.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	343 Then it's linked in at the front of the appropriate usedpools[] list, so
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	344 that the next allocation for its size class will reuse the freed block.
22697 6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	345
22741 771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	346 empty == all the pool's blocks are currently available for allocation
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	347 On transition to empty, a pool is unlinked from its usedpools[] list,
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	348 and linked to the front of its arena_object's singly-linked freepools list,
22741 771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	349 via its nextpool member. The prevpool member has no meaning in this case.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	350 Empty pools have no inherent size class: the next time a malloc finds
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	351 an empty list in usedpools[], it takes the first pool off of freepools.
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	352 If the size class needed happens to be the same as the size class the pool
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	353 last had, some pool initialization can be skipped.
22741 771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	354
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	355
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	356 Block Management
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	357
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	358 Blocks within pools are again carved out as needed. pool->freeblock points to
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	359 the start of a singly-linked list of free blocks within the pool. When a
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	360 block is freed, it's inserted at the front of its pool's freeblock list. Note
771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	361 that the available blocks in a pool are not linked all together when a pool
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	362 is initialized. Instead only "the first two" (lowest addresses) blocks are
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	363 set up, returning the first such block, and setting pool->freeblock to a
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	364 one-block list holding the second such block. This is consistent with that
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	365 pymalloc strives at all levels (arena, pool, and block) never to touch a piece
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	366 of memory until it's actually needed.
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	367
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	368 So long as a pool is in the used state, we're certain there is a block
22948 6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	369 available for allocating, and pool->freeblock is not NULL. If pool->freeblock
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	370 points to the end of the free list before we've carved the entire pool into
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	371 blocks, that means we simply haven't yet gotten to one of the higher-address
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	372 blocks. The offset from the pool_header to the start of "the next" virgin
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	373 block is stored in the pool_header nextoffset member, and the largest value
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	374 of nextoffset that makes sense is stored in the maxnextoffset member when a
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	375 pool is initialized. All the blocks in a pool have been passed out at least
6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	376 once when and only when nextoffset > maxnextoffset.
22741 771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	377
22697 6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	378
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	379 Major obscurity: While the usedpools vector is declared to have poolp
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	380 entries, it doesn't really. It really contains two pointers per (conceptual)
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	381 poolp entry, the nextpool and prevpool members of a pool_header. The
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	382 excruciating initialization code below fools C so that
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	383
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	384 usedpool[i+i]
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	385
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	386 "acts like" a genuine poolp, but only so long as you only reference its
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	387 nextpool and prevpool members. The "- 2sizeof(block )" gibberish is
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	388 compensating for that a pool_header's nextpool and prevpool members
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	389 immediately follow a pool_header's first two members:
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	390
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	391 union { block *_padding;
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	392 uint count; } ref;
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	393 block *freeblock;
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	394
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	395 each of which consume sizeof(block *) bytes. So what usedpools[i+i] really
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	396 contains is a fudged-up pointer p such that if C believes it's a poolp
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	397 pointer, then p->nextpool and p->prevpool are both p (meaning that the headed
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	398 circular list is empty).
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	399
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	400 It's unclear why the usedpools setup is so convoluted. It could be to
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	401 minimize the amount of cache required to hold this heavily-referenced table
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	402 (which only needs the two interpool pointer members of a pool_header). OTOH,
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	403 referencing code has to remember to "double the index" and doing so isn't
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	404 free, usedpools[0] isn't a strictly legal pointer, and we're crucially relying
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	405 on that C doesn't insert any padding anywhere in a pool_header at or before
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	406 the prevpool member.
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	407 **************************************************************************** */
6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	408
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	409 #define PTA(x) ((poolp )((uchar )&(usedpools[2(x)]) - 2sizeof(block )))
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	410 #define PT(x) PTA(x), PTA(x)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	411
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	412 static poolp usedpools[2 * ((NB_SMALL_SIZE_CLASSES + 7) / 8) * 8] = {
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	413 PT(0), PT(1), PT(2), PT(3), PT(4), PT(5), PT(6), PT(7)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	414 #if NB_SMALL_SIZE_CLASSES > 8
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	415 , PT(8), PT(9), PT(10), PT(11), PT(12), PT(13), PT(14), PT(15)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	416 #if NB_SMALL_SIZE_CLASSES > 16
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	417 , PT(16), PT(17), PT(18), PT(19), PT(20), PT(21), PT(22), PT(23)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	418 #if NB_SMALL_SIZE_CLASSES > 24
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	419 , PT(24), PT(25), PT(26), PT(27), PT(28), PT(29), PT(30), PT(31)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	420 #if NB_SMALL_SIZE_CLASSES > 32
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	421 , PT(32), PT(33), PT(34), PT(35), PT(36), PT(37), PT(38), PT(39)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	422 #if NB_SMALL_SIZE_CLASSES > 40
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	423 , PT(40), PT(41), PT(42), PT(43), PT(44), PT(45), PT(46), PT(47)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	424 #if NB_SMALL_SIZE_CLASSES > 48
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	425 , PT(48), PT(49), PT(50), PT(51), PT(52), PT(53), PT(54), PT(55)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	426 #if NB_SMALL_SIZE_CLASSES > 56
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	427 , PT(56), PT(57), PT(58), PT(59), PT(60), PT(61), PT(62), PT(63)
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	428 #endif /* NB_SMALL_SIZE_CLASSES > 56 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	429 #endif /* NB_SMALL_SIZE_CLASSES > 48 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	430 #endif /* NB_SMALL_SIZE_CLASSES > 40 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	431 #endif /* NB_SMALL_SIZE_CLASSES > 32 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	432 #endif /* NB_SMALL_SIZE_CLASSES > 24 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	433 #endif /* NB_SMALL_SIZE_CLASSES > 16 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	434 #endif /* NB_SMALL_SIZE_CLASSES > 8 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	435 };
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	436
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	437 /*==========================================================================
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	438 Arena management.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	439
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	440 `arenas` is a vector of arena_objects. It contains maxarenas entries, some of
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	441 which may not be currently used (== they're arena_objects that aren't
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	442 currently associated with an allocated arena). Note that arenas proper are
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	443 separately malloc'ed.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	444
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	445 Prior to Python 2.5, arenas were never free()'ed. Starting with Python 2.5,
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	446 we do try to free() arenas, and use some mild heuristic strategies to increase
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	447 the likelihood that arenas eventually can be freed.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	448
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	449 unused_arena_objects
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	450
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	451 This is a singly-linked list of the arena_objects that are currently not
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	452 being used (no arena is associated with them). Objects are taken off the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	453 head of the list in new_arena(), and are pushed on the head of the list in
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	454 PyObject_Free() when the arena is empty. Key invariant: an arena_object
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	455 is on this list if and only if its .address member is 0.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	456
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	457 usable_arenas
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	458
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	459 This is a doubly-linked list of the arena_objects associated with arenas
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	460 that have pools available. These pools are either waiting to be reused,
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	461 or have not been used before. The list is sorted to have the most-
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	462 allocated arenas first (ascending order based on the nfreepools member).
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	463 This means that the next allocation will come from a heavily used arena,
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	464 which gives the nearly empty arenas a chance to be returned to the system.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	465 In my unscientific tests this dramatically improved the number of arenas
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	466 that could be freed.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	467
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	468 Note that an arena_object associated with an arena all of whose pools are
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	469 currently in use isn't on either list.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	470 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	471
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	472 /* Array of objects used to track chunks of memory (arenas). */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	473 static struct arena_object* arenas = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	474 /* Number of slots currently allocated in the `arenas` vector. */
22690 00b2972ab4a4 Changed the #-of-arenas counters to uints -- no need to be insane about Tim Peters <tim.peters@gmail.com> parents: 22687 diff changeset	475 static uint maxarenas = 0;
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	476
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	477 /* The head of the singly-linked, NULL-terminated list of available
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	478 * arena_objects.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	479 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	480 static struct arena_object* unused_arena_objects = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	481
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	482 /* The head of the doubly-linked, NULL-terminated at each end, list of
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	483 * arena_objects associated with arenas that have pools available.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	484 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	485 static struct arena_object* usable_arenas = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	486
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	487 /* How many arena_objects do we initially allocate?
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	488 * 16 = can allocate 16 arenas = 16 * ARENA_SIZE = 4MB before growing the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	489 * `arenas` vector.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	490 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	491 #define INITIAL_ARENA_OBJECTS 16
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	492
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	493 /* Number of arenas allocated that haven't been free()'d. */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	494 static size_t narenas_currently_allocated = 0;
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	495
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	496 #ifdef PYMALLOC_DEBUG
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	497 /* Total number of times malloc() called to allocate an arena. */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	498 static size_t ntimes_arena_allocated = 0;
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	499 /* High water mark (max value ever seen) for narenas_currently_allocated. */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	500 static size_t narenas_highwater = 0;
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	501 #endif
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	502
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	503 /* Allocate a new arena. If we run out of memory, return NULL. Else
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	504 * allocate a new arena, and return the address of an arena_object
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	505 * describing the new arena. It's expected that the caller will set
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	506 * `usable_arenas` to the return value.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	507 */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	508 static struct arena_object*
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	509 new_arena(void)
fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	510 {
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	511 struct arena_object* arenaobj;
22686 f8bd930644aa Now that we're no longer linking arenas together, there's no need to Tim Peters <tim.peters@gmail.com> parents: 22685 diff changeset	512 uint excess; /* number of bytes above pool alignment */
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	513
23020 e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	514 #ifdef PYMALLOC_DEBUG
e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	515 if (Py_GETENV("PYTHONMALLOCSTATS"))
e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	516 _PyObject_DebugMallocStats();
e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	517 #endif
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	518 if (unused_arena_objects == NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	519 uint i;
49144 3dc31809631f Issue #3642: Suppress warning in obmalloc when size_t is Martin v. Löwis <martin@v.loewis.de> parents: 48824 diff changeset	520 uint numarenas;
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	521 size_t nbytes;
23020 e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	522
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	523 /* Double the number of arena objects on each allocation.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	524 * Note that it's possible for `numarenas` to overflow.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	525 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	526 numarenas = maxarenas ? maxarenas << 1 : INITIAL_ARENA_OBJECTS;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	527 if (numarenas <= maxarenas)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	528 return NULL; /* overflow */
49144 3dc31809631f Issue #3642: Suppress warning in obmalloc when size_t is Martin v. Löwis <martin@v.loewis.de> parents: 48824 diff changeset	529 #if SIZEOF_SIZE_T <= SIZEOF_INT
47587 1c964ed35ef9 Merge in release25-maint r60793: Gregory P. Smith <greg@mad-scientist.com> parents: 42333 diff changeset	530 if (numarenas > PY_SIZE_MAX / sizeof(*arenas))
1c964ed35ef9 Merge in release25-maint r60793: Gregory P. Smith <greg@mad-scientist.com> parents: 42333 diff changeset	531 return NULL; /* overflow */
49144 3dc31809631f Issue #3642: Suppress warning in obmalloc when size_t is Martin v. Löwis <martin@v.loewis.de> parents: 48824 diff changeset	532 #endif
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	533 nbytes = numarenas * sizeof(*arenas);
37598 56e00c9b5011 Get compiling again Neal Norwitz <nnorwitz@gmail.com> parents: 37596 diff changeset	534 arenaobj = (struct arena_object *)realloc(arenas, nbytes);
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	535 if (arenaobj == NULL)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	536 return NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	537 arenas = arenaobj;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	538
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	539 /* We might need to fix pointers that were copied. However,
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	540 * new_arena only gets called when all the pages in the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	541 * previous arenas are full. Thus, there are no pointers
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	542 * into the old array. Thus, we don't have to worry about
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	543 * invalid pointers. Just to be sure, some asserts:
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	544 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	545 assert(usable_arenas == NULL);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	546 assert(unused_arena_objects == NULL);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	547
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	548 /* Put the new arenas on the unused_arena_objects list. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	549 for (i = maxarenas; i < numarenas; ++i) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	550 arenas[i].address = 0; /* mark as unassociated */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	551 arenas[i].nextarena = i < numarenas - 1 ?
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	552 &arenas[i+1] : NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	553 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	554
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	555 /* Update globals. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	556 unused_arena_objects = &arenas[maxarenas];
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	557 maxarenas = numarenas;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	558 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	559
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	560 /* Take the next available arena object off the head of the list. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	561 assert(unused_arena_objects != NULL);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	562 arenaobj = unused_arena_objects;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	563 unused_arena_objects = arenaobj->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	564 assert(arenaobj->address == 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	565 arenaobj->address = (uptr)malloc(ARENA_SIZE);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	566 if (arenaobj->address == 0) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	567 /* The allocation failed: return NULL after putting the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	568 * arenaobj back.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	569 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	570 arenaobj->nextarena = unused_arena_objects;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	571 unused_arena_objects = arenaobj;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	572 return NULL;
22686 f8bd930644aa Now that we're no longer linking arenas together, there's no need to Tim Peters <tim.peters@gmail.com> parents: 22685 diff changeset	573 }
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	574
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	575 ++narenas_currently_allocated;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	576 #ifdef PYMALLOC_DEBUG
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	577 ++ntimes_arena_allocated;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	578 if (narenas_currently_allocated > narenas_highwater)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	579 narenas_highwater = narenas_currently_allocated;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	580 #endif
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	581 arenaobj->freepools = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	582 /* pool_address <- first pool-aligned address in the arena
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	583 nfreepools <- number of whole pools that fit after alignment */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	584 arenaobj->pool_address = (block*)arenaobj->address;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	585 arenaobj->nfreepools = ARENA_SIZE / POOL_SIZE;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	586 assert(POOL_SIZE * arenaobj->nfreepools == ARENA_SIZE);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	587 excess = (uint)(arenaobj->address & POOL_SIZE_MASK);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	588 if (excess != 0) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	589 --arenaobj->nfreepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	590 arenaobj->pool_address += POOL_SIZE - excess;
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	591 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	592 arenaobj->ntotalpools = arenaobj->nfreepools;
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	593
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	594 return arenaobj;
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	595 }
fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	596
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	597 /*
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	598 Py_ADDRESS_IN_RANGE(P, POOL)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	599
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	600 Return true if and only if P is an address that was allocated by pymalloc.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	601 POOL must be the pool address associated with P, i.e., POOL = POOL_ADDR(P)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	602 (the caller is asked to compute this because the macro expands POOL more than
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	603 once, and for efficiency it's best for the caller to assign POOL_ADDR(P) to a
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	604 variable and pass the latter to the macro; because Py_ADDRESS_IN_RANGE is
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	605 called on every alloc/realloc/free, micro-efficiency is important here).
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	606
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	607 Tricky: Let B be the arena base address associated with the pool, B =
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	608 arenas[(POOL)->arenaindex].address. Then P belongs to the arena if and only if
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	609
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	610 B <= P < B + ARENA_SIZE
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	611
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	612 Subtracting B throughout, this is true iff
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	613
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	614 0 <= P-B < ARENA_SIZE
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	615
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	616 By using unsigned arithmetic, the "0 <=" half of the test can be skipped.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	617
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	618 Obscure: A PyMem "free memory" function can call the pymalloc free or realloc
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	619 before the first arena has been allocated. `arenas` is still NULL in that
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	620 case. We're relying on that maxarenas is also 0 in that case, so that
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	621 (POOL)->arenaindex < maxarenas must be false, saving us from trying to index
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	622 into a NULL arenas.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	623
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	624 Details: given P and POOL, the arena_object corresponding to P is AO =
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	625 arenas[(POOL)->arenaindex]. Suppose obmalloc controls P. Then (barring wild
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	626 stores, etc), POOL is the correct address of P's pool, AO.address is the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	627 correct base address of the pool's arena, and P must be within ARENA_SIZE of
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	628 AO.address. In addition, AO.address is not 0 (no arena can start at address 0
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	629 (NULL)). Therefore Py_ADDRESS_IN_RANGE correctly reports that obmalloc
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	630 controls P.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	631
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	632 Now suppose obmalloc does not control P (e.g., P was obtained via a direct
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	633 call to the system malloc() or realloc()). (POOL)->arenaindex may be anything
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	634 in this case -- it may even be uninitialized trash. If the trash arenaindex
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	635 is >= maxarenas, the macro correctly concludes at once that obmalloc doesn't
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	636 control P.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	637
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	638 Else arenaindex is < maxarena, and AO is read up. If AO corresponds to an
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	639 allocated arena, obmalloc controls all the memory in slice AO.address :
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	640 AO.address+ARENA_SIZE. By case assumption, P is not controlled by obmalloc,
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	641 so P doesn't lie in that slice, so the macro correctly reports that P is not
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	642 controlled by obmalloc.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	643
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	644 Finally, if P is not controlled by obmalloc and AO corresponds to an unused
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	645 arena_object (one not currently associated with an allocated arena),
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	646 AO.address is 0, and the second test in the macro reduces to:
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	647
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	648 P < ARENA_SIZE
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	649
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	650 If P >= ARENA_SIZE (extremely likely), the macro again correctly concludes
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	651 that P is not controlled by obmalloc. However, if P < ARENA_SIZE, this part
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	652 of the test still passes, and the third clause (AO.address != 0) is necessary
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	653 to get the correct result: AO.address is 0 in this case, so the macro
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	654 correctly reports that P is not controlled by obmalloc (despite that P lies in
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	655 slice AO.address : AO.address + ARENA_SIZE).
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	656
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	657 Note: The third (AO.address != 0) clause was added in Python 2.5. Before
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	658 2.5, arenas were never free()'ed, and an arenaindex < maxarena always
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	659 corresponded to a currently-allocated arena, so the "P is not controlled by
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	660 obmalloc, AO corresponds to an unused arena_object, and P < ARENA_SIZE" case
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	661 was impossible.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	662
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	663 Note that the logic is excruciating, and reading up possibly uninitialized
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	664 memory when P is not controlled by obmalloc (to get at (POOL)->arenaindex)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	665 creates problems for some memory debuggers. The overwhelming advantage is
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	666 that this test determines whether an arbitrary address is controlled by
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	667 obmalloc in a small constant time, independent of the number of arenas
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	668 obmalloc controls. Since this test is needed at every entry point, it's
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	669 extremely desirable that it be this fast.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	670 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	671 #define Py_ADDRESS_IN_RANGE(P, POOL) \
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	672 ((POOL)->arenaindex < maxarenas && \
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	673 (uptr)(P) - arenas[(POOL)->arenaindex].address < (uptr)ARENA_SIZE && \
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	674 arenas[(POOL)->arenaindex].address != 0)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	675
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	676
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	677 /* This is only useful when running memory debuggers such as
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	678 * Purify or Valgrind. Uncomment to use.
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	679 *
49293 9d1c531168ca Bug #3951: Py_USING_MEMORY_DEBUGGER should not be enabled by default. Martin v. Löwis <martin@v.loewis.de> parents: 49144 diff changeset	680 #define Py_USING_MEMORY_DEBUGGER
42333 6620a510e9a9 PEP 3123: Provide forward compatibility with Python 3.0, while keeping Martin v. Löwis <martin@v.loewis.de> parents: 40229 diff changeset	681 */
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	682
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	683 #ifdef Py_USING_MEMORY_DEBUGGER
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	684
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	685 /* Py_ADDRESS_IN_RANGE may access uninitialized memory by design
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	686 * This leads to thousands of spurious warnings when using
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	687 * Purify or Valgrind. By making a function, we can easily
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	688 * suppress the uninitialized memory reads in this one function.
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	689 * So we won't ignore real errors elsewhere.
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	690 *
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	691 * Disable the macro and use a function.
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	692 */
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	693
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	694 #undef Py_ADDRESS_IN_RANGE
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	695
40229 321c075f95cf Don't inline Py_ADDRESS_IN_RANGE with gcc 4+ either. Neal Norwitz <nnorwitz@gmail.com> parents: 38576 diff changeset	696 #if defined(__GNUC__) && ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) \|\| \
321c075f95cf Don't inline Py_ADDRESS_IN_RANGE with gcc 4+ either. Neal Norwitz <nnorwitz@gmail.com> parents: 38576 diff changeset	697 (__GNUC__ >= 4))
35864 dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	698 #define Py_NO_INLINE __attribute__((__noinline__))
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	699 #else
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	700 #define Py_NO_INLINE
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	701 #endif
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	702
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	703 /* Don't make static, to try to ensure this isn't inlined. */
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	704 int Py_ADDRESS_IN_RANGE(void *P, poolp pool) Py_NO_INLINE;
dbc93ee53e2f Do a better job of not inlining Py_ADDRESS_IN_RANGE() for newer gcc's. Neal Norwitz <nnorwitz@gmail.com> parents: 35222 diff changeset	705 #undef Py_NO_INLINE
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	706 #endif
22741 771b2a8d445d Restructured my pool-management overview in terms of the three Tim Peters <tim.peters@gmail.com> parents: 22724 diff changeset	707
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	708 /==========================================================================/
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	709
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	710 /* malloc. Note that nbytes==0 tries to return a non-NULL pointer, distinct
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	711 * from all other currently live pointers. This may not be possible.
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	712 */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	713
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	714 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	715 * The basic blocks are ordered by decreasing execution frequency,
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	716 * which minimizes the number of jumps in the most common cases,
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	717 * improves branching prediction and instruction scheduling (small
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	718 * block allocations typically result in a couple of instructions).
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	719 * Unless the optimizer reorders everything, being too smart...
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	720 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	721
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	722 #undef PyObject_Malloc
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	723 void *
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	724 PyObject_Malloc(size_t nbytes)
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	725 {
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	726 block *bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	727 poolp pool;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	728 poolp next;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	729 uint size;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	730
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	731 /*
48046 5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	732 * Limit ourselves to PY_SSIZE_T_MAX bytes to prevent security holes.
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	733 * Most python internals blindly use a signed Py_ssize_t to track
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	734 * things without checking for overflows or negatives.
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	735 * As size_t is unsigned, checking for nbytes < 0 is not required.
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	736 */
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	737 if (nbytes > PY_SSIZE_T_MAX)
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	738 return NULL;
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	739
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	740 /*
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	741 * This implicitly redirects malloc(0).
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	742 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	743 if ((nbytes - 1) < SMALL_REQUEST_THRESHOLD) {
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	744 LOCK();
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	745 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	746 * Most frequent paths first
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	747 */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	748 size = (uint)(nbytes - 1) >> ALIGNMENT_SHIFT;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	749 pool = usedpools[size + size];
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	750 if (pool != pool->nextpool) {
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	751 /*
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	752 * There is a used pool for this size class.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	753 * Pick up the head block of its free list.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	754 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	755 ++pool->ref.count;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	756 bp = pool->freeblock;
22948 6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	757 assert(bp != NULL);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	758 if ((pool->freeblock = (block *)bp) != NULL) {
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	759 UNLOCK();
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	760 return (void *)bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	761 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	762 /*
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	763 * Reached the end of the free list, try to extend it.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	764 */
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	765 if (pool->nextoffset <= pool->maxnextoffset) {
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	766 /* There is room for another block. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	767 pool->freeblock = (block*)pool +
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	768 pool->nextoffset;
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	769 pool->nextoffset += INDEX2SIZE(size);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	770 (block *)(pool->freeblock) = NULL;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	771 UNLOCK();
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	772 return (void *)bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	773 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	774 /* Pool is full, unlink from used pools. */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	775 next = pool->nextpool;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	776 pool = pool->prevpool;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	777 next->prevpool = pool;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	778 pool->nextpool = next;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	779 UNLOCK();
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	780 return (void *)bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	781 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	782
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	783 /* There isn't a pool of the right size class immediately
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	784 * available: use a free pool.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	785 */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	786 if (usable_arenas == NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	787 /* No arena has a free pool: allocate a new arena. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	788 #ifdef WITH_MEMORY_LIMITS
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	789 if (narenas_currently_allocated >= MAX_ARENAS) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	790 UNLOCK();
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	791 goto redirect;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	792 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	793 #endif
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	794 usable_arenas = new_arena();
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	795 if (usable_arenas == NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	796 UNLOCK();
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	797 goto redirect;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	798 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	799 usable_arenas->nextarena =
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	800 usable_arenas->prevarena = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	801 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	802 assert(usable_arenas->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	803
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	804 /* Try to get a cached free pool. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	805 pool = usable_arenas->freepools;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	806 if (pool != NULL) {
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	807 /* Unlink from cached pools. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	808 usable_arenas->freepools = pool->nextpool;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	809
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	810 /* This arena already had the smallest nfreepools
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	811 * value, so decreasing nfreepools doesn't change
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	812 * that, and we don't need to rearrange the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	813 * usable_arenas list. However, if the arena has
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	814 * become wholly allocated, we need to remove its
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	815 * arena_object from usable_arenas.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	816 */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	817 --usable_arenas->nfreepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	818 if (usable_arenas->nfreepools == 0) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	819 /* Wholly allocated: remove. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	820 assert(usable_arenas->freepools == NULL);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	821 assert(usable_arenas->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	822 usable_arenas->nextarena->prevarena ==
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	823 usable_arenas);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	824
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	825 usable_arenas = usable_arenas->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	826 if (usable_arenas != NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	827 usable_arenas->prevarena = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	828 assert(usable_arenas->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	829 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	830 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	831 else {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	832 /* nfreepools > 0: it must be that freepools
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	833 * isn't NULL, or that we haven't yet carved
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	834 * off all the arena's pools for the first
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	835 * time.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	836 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	837 assert(usable_arenas->freepools != NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	838 usable_arenas->pool_address <=
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	839 (block*)usable_arenas->address +
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	840 ARENA_SIZE - POOL_SIZE);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	841 }
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	842 init_pool:
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	843 /* Frontlink to used pools. */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	844 next = usedpools[size + size]; /* == prev */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	845 pool->nextpool = next;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	846 pool->prevpool = next;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	847 next->nextpool = pool;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	848 next->prevpool = pool;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	849 pool->ref.count = 1;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	850 if (pool->szidx == size) {
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	851 /* Luckily, this pool last contained blocks
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	852 * of the same size class, so its header
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	853 * and free list are already initialized.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	854 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	855 bp = pool->freeblock;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	856 pool->freeblock = (block *)bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	857 UNLOCK();
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	858 return (void *)bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	859 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	860 /*
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	861 * Initialize the pool header, set up the free list to
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	862 * contain just the second block, and return the first
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	863 * block.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	864 */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	865 pool->szidx = size;
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	866 size = INDEX2SIZE(size);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	867 bp = (block *)pool + POOL_OVERHEAD;
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	868 pool->nextoffset = POOL_OVERHEAD + (size << 1);
f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	869 pool->maxnextoffset = POOL_SIZE - size;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	870 pool->freeblock = bp + size;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	871 (block *)(pool->freeblock) = NULL;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	872 UNLOCK();
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	873 return (void *)bp;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	874 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	875
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	876 /* Carve off a new pool. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	877 assert(usable_arenas->nfreepools > 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	878 assert(usable_arenas->freepools == NULL);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	879 pool = (poolp)usable_arenas->pool_address;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	880 assert((block)pool <= (block)usable_arenas->address +
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	881 ARENA_SIZE - POOL_SIZE);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	882 pool->arenaindex = usable_arenas - arenas;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	883 assert(&arenas[pool->arenaindex] == usable_arenas);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	884 pool->szidx = DUMMY_SIZE_IDX;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	885 usable_arenas->pool_address += POOL_SIZE;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	886 --usable_arenas->nfreepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	887
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	888 if (usable_arenas->nfreepools == 0) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	889 assert(usable_arenas->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	890 usable_arenas->nextarena->prevarena ==
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	891 usable_arenas);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	892 /* Unlink the arena: it is completely allocated. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	893 usable_arenas = usable_arenas->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	894 if (usable_arenas != NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	895 usable_arenas->prevarena = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	896 assert(usable_arenas->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	897 }
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	898 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	899
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	900 goto init_pool;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	901 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	902
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	903 /* The small block allocator ends here. */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	904
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	905 redirect:
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	906 /* Redirect the original request to the underlying (libc) allocator.
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	907 * We jump here on bigger requests, on error in the code above (as a
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	908 * last chance to serve the request) or when the max memory limit
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	909 * has been reached.
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	910 */
23158 4ab21e354403 PyObject_Malloc: make a tiny bit faster for platforms where malloc(0) Tim Peters <tim.peters@gmail.com> parents: 23157 diff changeset	911 if (nbytes == 0)
4ab21e354403 PyObject_Malloc: make a tiny bit faster for platforms where malloc(0) Tim Peters <tim.peters@gmail.com> parents: 23157 diff changeset	912 nbytes = 1;
4ab21e354403 PyObject_Malloc: make a tiny bit faster for platforms where malloc(0) Tim Peters <tim.peters@gmail.com> parents: 23157 diff changeset	913 return (void *)malloc(nbytes);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	914 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	915
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	916 /* free */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	917
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	918 #undef PyObject_Free
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	919 void
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	920 PyObject_Free(void *p)
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	921 {
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	922 poolp pool;
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	923 block *lastfree;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	924 poolp next, prev;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	925 uint size;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	926
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	927 if (p == NULL) /* free(NULL) has no effect */
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	928 return;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	929
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	930 pool = POOL_ADDR(p);
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	931 if (Py_ADDRESS_IN_RANGE(p, pool)) {
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	932 /* We allocated this address. */
22697 6bb4386b1111 Added a long-overdue comment block giving an overview of pool operations Tim Peters <tim.peters@gmail.com> parents: 22692 diff changeset	933 LOCK();
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	934 /* Link p to the start of the pool's freeblock list. Since
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	935 * the pool had at least the p block outstanding, the pool
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	936 * wasn't empty (so it's already in a usedpools[] list, or
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	937 * was full and is in no list -- it's not in the freeblocks
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	938 * list in any case).
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	939 */
22701 cf1a05c86595 Add one more assert that indirectly interlocking conditions are consistent Tim Peters <tim.peters@gmail.com> parents: 22700 diff changeset	940 assert(pool->ref.count > 0); /* else it was empty */
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	941 (block *)p = lastfree = pool->freeblock;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	942 pool->freeblock = (block *)p;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	943 if (lastfree) {
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	944 struct arena_object* ao;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	945 uint nf; /* ao->nfreepools */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	946
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	947 /* freeblock wasn't NULL, so the pool wasn't full,
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	948 * and the pool is in a usedpools[] list.
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	949 */
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	950 if (--pool->ref.count != 0) {
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	951 /* pool isn't empty: leave it in usedpools */
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	952 UNLOCK();
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	953 return;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	954 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	955 /* Pool is now empty: unlink from usedpools, and
22699 35f58c297899 Fixed a typo in a new comment. Tim Peters <tim.peters@gmail.com> parents: 22698 diff changeset	956 * link to the front of freepools. This ensures that
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	957 * previously freed pools will be allocated later
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	958 * (being not referenced, they are perhaps paged out).
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	959 */
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	960 next = pool->nextpool;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	961 prev = pool->prevpool;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	962 next->prevpool = prev;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	963 prev->nextpool = next;
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	964
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	965 /* Link the pool to freepools. This is a singly-linked
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	966 * list, and pool->prevpool isn't used there.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	967 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	968 ao = &arenas[pool->arenaindex];
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	969 pool->nextpool = ao->freepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	970 ao->freepools = pool;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	971 nf = ++ao->nfreepools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	972
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	973 /* All the rest is arena management. We just freed
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	974 * a pool, and there are 4 cases for arena mgmt:
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	975 * 1. If all the pools are free, return the arena to
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	976 * the system free().
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	977 * 2. If this is the only free pool in the arena,
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	978 * add the arena back to the `usable_arenas` list.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	979 * 3. If the "next" arena has a smaller count of free
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	980 * pools, we have to "slide this arena right" to
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	981 * restore that usable_arenas is sorted in order of
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	982 * nfreepools.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	983 * 4. Else there's nothing more to do.
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	984 */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	985 if (nf == ao->ntotalpools) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	986 /* Case 1. First unlink ao from usable_arenas.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	987 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	988 assert(ao->prevarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	989 ao->prevarena->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	990 assert(ao ->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	991 ao->nextarena->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	992
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	993 /* Fix the pointer in the prevarena, or the
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	994 * usable_arenas pointer.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	995 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	996 if (ao->prevarena == NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	997 usable_arenas = ao->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	998 assert(usable_arenas == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	999 usable_arenas->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1000 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1001 else {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1002 assert(ao->prevarena->nextarena == ao);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1003 ao->prevarena->nextarena =
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1004 ao->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1005 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1006 /* Fix the pointer in the nextarena. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1007 if (ao->nextarena != NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1008 assert(ao->nextarena->prevarena == ao);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1009 ao->nextarena->prevarena =
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1010 ao->prevarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1011 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1012 /* Record that this arena_object slot is
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1013 * available to be reused.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1014 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1015 ao->nextarena = unused_arena_objects;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1016 unused_arena_objects = ao;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1017
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1018 /* Free the entire arena. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1019 free((void *)ao->address);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1020 ao->address = 0; /* mark unassociated */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1021 --narenas_currently_allocated;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1022
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1023 UNLOCK();
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1024 return;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1025 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1026 if (nf == 1) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1027 /* Case 2. Put ao at the head of
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1028 * usable_arenas. Note that because
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1029 * ao->nfreepools was 0 before, ao isn't
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1030 * currently on the usable_arenas list.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1031 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1032 ao->nextarena = usable_arenas;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1033 ao->prevarena = NULL;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1034 if (usable_arenas)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1035 usable_arenas->prevarena = ao;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1036 usable_arenas = ao;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1037 assert(usable_arenas->address != 0);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1038
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1039 UNLOCK();
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1040 return;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1041 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1042 /* If this arena is now out of order, we need to keep
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1043 * the list sorted. The list is kept sorted so that
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1044 * the "most full" arenas are used first, which allows
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1045 * the nearly empty arenas to be completely freed. In
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1046 * a few un-scientific tests, it seems like this
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1047 * approach allowed a lot more memory to be freed.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1048 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1049 if (ao->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1050 nf <= ao->nextarena->nfreepools) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1051 /* Case 4. Nothing to do. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1052 UNLOCK();
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1053 return;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1054 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1055 /* Case 3: We have to move the arena towards the end
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1056 * of the list, because it has more free pools than
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1057 * the arena to its right.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1058 * First unlink ao from usable_arenas.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1059 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1060 if (ao->prevarena != NULL) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1061 /* ao isn't at the head of the list */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1062 assert(ao->prevarena->nextarena == ao);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1063 ao->prevarena->nextarena = ao->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1064 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1065 else {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1066 /* ao is at the head of the list */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1067 assert(usable_arenas == ao);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1068 usable_arenas = ao->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1069 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1070 ao->nextarena->prevarena = ao->prevarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1071
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1072 /* Locate the new insertion point by iterating over
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1073 * the list, using our nextarena pointer.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1074 */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1075 while (ao->nextarena != NULL &&
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1076 nf > ao->nextarena->nfreepools) {
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1077 ao->prevarena = ao->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1078 ao->nextarena = ao->nextarena->nextarena;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1079 }
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1080
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1081 /* Insert ao at this point. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1082 assert(ao->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1083 ao->prevarena == ao->nextarena->prevarena);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1084 assert(ao->prevarena->nextarena == ao->nextarena);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1085
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1086 ao->prevarena->nextarena = ao;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1087 if (ao->nextarena != NULL)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1088 ao->nextarena->prevarena = ao;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1089
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1090 /* Verify that the swaps worked. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1091 assert(ao->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1092 nf <= ao->nextarena->nfreepools);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1093 assert(ao->prevarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1094 nf > ao->prevarena->nfreepools);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1095 assert(ao->nextarena == NULL \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1096 ao->nextarena->prevarena == ao);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1097 assert((usable_arenas == ao &&
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1098 ao->prevarena == NULL) \|\|
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1099 ao->prevarena->nextarena == ao);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1100
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	1101 UNLOCK();
fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	1102 return;
fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	1103 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1104 /* Pool was full, so doesn't currently live in any list:
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1105 * link it to the front of the appropriate usedpools[] list.
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1106 * This mimics LRU pool usage for new allocations and
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1107 * targets optimal filling when several pools contain
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1108 * blocks of the same size class.
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	1109 */
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1110 --pool->ref.count;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1111 assert(pool->ref.count > 0); /* else the pool is empty */
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1112 size = pool->szidx;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1113 next = usedpools[size + size];
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1114 prev = next->prevpool;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1115 /* insert pool before next: prev <-> pool <-> next */
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1116 pool->nextpool = next;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1117 pool->prevpool = prev;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1118 next->prevpool = pool;
a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1119 prev->nextpool = pool;
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	1120 UNLOCK();
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1121 return;
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1122 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1123
22698 a4a1e6f55531 _PyMalloc_Free(): As was already done for _PyMalloc_Malloc, rearranged Tim Peters <tim.peters@gmail.com> parents: 22697 diff changeset	1124 /* We didn't allocate this address. */
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1125 free(p);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1126 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1127
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1128 /* realloc. If p is NULL, this acts like malloc(nbytes). Else if nbytes==0,
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1129 * then as the Python docs promise, we do not treat this like free(p), and
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1130 * return a non-NULL result.
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1131 */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1132
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1133 #undef PyObject_Realloc
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1134 void *
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1135 PyObject_Realloc(void *p, size_t nbytes)
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1136 {
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1137 void *bp;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1138 poolp pool;
36501 7fdc639bc5b4 Merge ssize_t branch. Martin v. Löwis <martin@v.loewis.de> parents: 35864 diff changeset	1139 size_t size;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1140
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1141 if (p == NULL)
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1142 return PyObject_Malloc(nbytes);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1143
48046 5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1144 /*
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1145 * Limit ourselves to PY_SSIZE_T_MAX bytes to prevent security holes.
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1146 * Most python internals blindly use a signed Py_ssize_t to track
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1147 * things without checking for overflows or negatives.
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1148 * As size_t is unsigned, checking for nbytes < 0 is not required.
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1149 */
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1150 if (nbytes > PY_SSIZE_T_MAX)
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1151 return NULL;
5d3833e6aae3 Issue #2620: Overflow checking when allocating or reallocating memory Gregory P. Smith <greg@mad-scientist.com> parents: 47587 diff changeset	1152
22684 fd1b8ebe4eae Lots of changes: Tim Peters <tim.peters@gmail.com> parents: 22631 diff changeset	1153 pool = POOL_ADDR(p);
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1154 if (Py_ADDRESS_IN_RANGE(p, pool)) {
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1155 /* We're in charge of this block */
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	1156 size = INDEX2SIZE(pool->szidx);
23363 36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1157 if (nbytes <= size) {
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1158 /* The block is staying the same or shrinking. If
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1159 * it's shrinking, there's a tradeoff: it costs
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1160 * cycles to copy the block to a smaller size class,
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1161 * but it wastes memory not to copy it. The
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1162 * compromise here is to copy on shrink only if at
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1163 * least 25% of size can be shaved off.
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1164 */
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1165 if (4 * nbytes > 3 * size) {
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1166 /* It's the same,
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1167 * or shrinking and new/old > 3/4.
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1168 */
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1169 return p;
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1170 }
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1171 size = nbytes;
36840a989722 PyObject_Realloc(): If a small block is shrinking, bite the expense of Tim Peters <tim.peters@gmail.com> parents: 23298 diff changeset	1172 }
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1173 bp = PyObject_Malloc(nbytes);
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1174 if (bp != NULL) {
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1175 memcpy(bp, p, size);
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1176 PyObject_Free(p);
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1177 }
22794 f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1178 return bp;
f663ffbe9e5c _PyMalloc_{Malloc, Realloc}: Strive to meet the doc's promises about Tim Peters <tim.peters@gmail.com> parents: 22743 diff changeset	1179 }
35222 8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1180 /* We're not managing this block. If nbytes <=
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1181 * SMALL_REQUEST_THRESHOLD, it's tempting to try to take over this
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1182 * block. However, if we do, we need to copy the valid data from
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1183 * the C-managed block to one of our blocks, and there's no portable
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1184 * way to know how much of the memory space starting at p is valid.
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1185 * As bug 1185883 pointed out the hard way, it's possible that the
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1186 * C-managed block is "at the end" of allocated VM space, so that
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1187 * a memory fault can occur if we try to copy nbytes bytes starting
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1188 * at p. Instead we punt: let C continue to manage this block.
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1189 */
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1190 if (nbytes)
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1191 return realloc(p, nbytes);
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1192 /* C doesn't define the result of realloc(p, 0) (it may or may not
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1193 * return NULL then), but Python's docs promise that nbytes==0 never
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1194 * returns NULL. We don't pass 0 to realloc(), to avoid that endcase
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1195 * to begin with. Even then, we can't be sure that realloc() won't
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1196 * return NULL.
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1197 */
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1198 bp = realloc(p, 1);
8d0d395c211e Backport: Georg Brandl <georg@python.org> parents: 32279 diff changeset	1199 return bp ? bp : p;
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1200 }
5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1201
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1202 #else /* ! WITH_PYMALLOC */
16782 5864a9c58c81 Add Vladimir Marangozov's object allocator. It is disabled by default. This Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: diff changeset	1203
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1204 /==========================================================================/
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1205 /* pymalloc not enabled: Redirect the entry points to malloc. These will
1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1206 * only be used by extensions that are compiled with pymalloc enabled. */
22484 ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1207
22470 0e4758ccfe2b Just whitespace fiddling. Tim Peters <tim.peters@gmail.com> parents: 22469 diff changeset	1208 void *
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1209 PyObject_Malloc(size_t n)
22469 8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1210 {
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1211 return PyMem_MALLOC(n);
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1212 }
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1213
22470 0e4758ccfe2b Just whitespace fiddling. Tim Peters <tim.peters@gmail.com> parents: 22469 diff changeset	1214 void *
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1215 PyObject_Realloc(void *p, size_t n)
22469 8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1216 {
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1217 return PyMem_REALLOC(p, n);
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1218 }
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1219
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1220 void
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1221 PyObject_Free(void *p)
22469 8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1222 {
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1223 PyMem_FREE(p);
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1224 }
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1225 #endif /* WITH_PYMALLOC */
8d0061493c57 Build obmalloc.c directly instead of #include'ing from object.c. Tim Peters <tim.peters@gmail.com> parents: 22465 diff changeset	1226
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1227 #ifdef PYMALLOC_DEBUG
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1228 /==========================================================================/
22484 ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1229 /* A x-platform debugging allocator. This doesn't manage memory directly,
ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1230 * it wraps a real allocator, adding extra debugging info to the memory blocks.
ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1231 */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1232
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1233 /* Special bytes broadcast into debug memory blocks at appropriate times.
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1234 * Strings of these are unlikely to be valid addresses, floats, ints or
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1235 * 7-bit ASCII.
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1236 */
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1237 #undef CLEANBYTE
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1238 #undef DEADBYTE
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1239 #undef FORBIDDENBYTE
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1240 #define CLEANBYTE 0xCB /* clean (newly allocated) memory */
24177 a038abd08e4a Documented PYMALLOC_DEBUG. This completes primary coverage of all the Tim Peters <tim.peters@gmail.com> parents: 23363 diff changeset	1241 #define DEADBYTE 0xDB /* dead (newly freed) memory */
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1242 #define FORBIDDENBYTE 0xFB /* untouchable bytes at each end of a block */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1243
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1244 static size_t serialno = 0; /* incremented on each debug {m,re}alloc */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1245
22487 f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1246 /* serialno is always incremented via calling this routine. The point is
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1247 * to supply a single place to set a breakpoint.
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1248 */
22487 f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1249 static void
22631 7870fac049f7 Add missing "void" to function. Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22614 diff changeset	1250 bumpserialno(void)
22487 f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1251 {
f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1252 ++serialno;
f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1253 }
f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1254
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1255 #define SST SIZEOF_SIZE_T
22487 f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1256
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1257 /* Read sizeof(size_t) bytes at p as a big-endian size_t. */
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1258 static size_t
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1259 read_size_t(const void *p)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1260 {
22484 ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1261 const uchar q = (const uchar )p;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1262 size_t result = *q++;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1263 int i;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1264
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1265 for (i = SST; --i > 0; ++q)
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1266 result = (result << 8) \| *q;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1267 return result;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1268 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1269
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1270 /* Write n as a big-endian size_t, MSB at address p, LSB at
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1271 * p + sizeof(size_t) - 1.
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1272 */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1273 static void
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1274 write_size_t(void *p, size_t n)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1275 {
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1276 uchar q = (uchar )p + SST - 1;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1277 int i;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1278
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1279 for (i = SST; --i >= 0; --q) {
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1280 *q = (uchar)(n & 0xff);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1281 n >>= 8;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1282 }
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1283 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1284
23159 fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1285 #ifdef Py_DEBUG
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1286 /* Is target in the list? The list is traversed via the nextpool pointers.
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1287 * The list may be NULL-terminated, or circular. Return 1 if target is in
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1288 * list, else 0.
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1289 */
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1290 static int
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1291 pool_is_in_list(const poolp target, poolp list)
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1292 {
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1293 poolp origlist = list;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1294 assert(target != NULL);
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1295 if (list == NULL)
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1296 return 0;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1297 do {
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1298 if (target == list)
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1299 return 1;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1300 list = list->nextpool;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1301 } while (list != NULL && list != origlist);
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1302 return 0;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1303 }
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1304
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1305 #else
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1306 #define pool_is_in_list(X, Y) 1
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1307
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1308 #endif /* Py_DEBUG */
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1309
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1310 /* Let S = sizeof(size_t). The debug malloc asks for 4*S extra bytes and
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1311 fills them with useful stuff, here calling the underlying malloc's result p:
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1312
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1313 p[0: S]
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1314 Number of bytes originally asked for. This is a size_t, big-endian (easier
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1315 to read in a memory dump).
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1316 p[S: 2*S]
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1317 Copies of FORBIDDENBYTE. Used to catch under- writes and reads.
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1318 p[2S: 2S+n]
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1319 The requested memory, filled with copies of CLEANBYTE.
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1320 Used to catch reference to uninitialized memory.
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1321 &p[2*S] is returned. Note that this is 8-byte aligned if pymalloc
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1322 handled the request itself.
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1323 p[2S+n: 2S+n+S]
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1324 Copies of FORBIDDENBYTE. Used to catch over- writes and reads.
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1325 p[2S+n+S: 2S+n+2*S]
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1326 A serial number, incremented by 1 on each call to _PyObject_DebugMalloc
1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1327 and _PyObject_DebugRealloc.
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1328 This is a big-endian size_t.
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1329 If "bad memory" is detected later, the serial number gives an
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1330 excellent way to set a breakpoint on the next run, to capture the
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1331 instant at which this block was passed out.
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1332 */
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1333
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1334 void *
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1335 _PyObject_DebugMalloc(size_t nbytes)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1336 {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1337 uchar p; / base address of malloc'ed block */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1338 uchar tail; / p + 2SST + nbytes == pointer to tail pad bytes /
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1339 size_t total; /* nbytes + 4SST /
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1340
22487 f02cdb2bc17a _PyMalloc_DebugRealloc(): simplify decl of "fresh". Tim Peters <tim.peters@gmail.com> parents: 22484 diff changeset	1341 bumpserialno();
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1342 total = nbytes + 4*SST;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1343 if (total < nbytes)
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1344 /* overflow: can't represent total as a size_t */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1345 return NULL;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1346
23009 8be6238748c4 Small anal correctness tweaks: Tim Peters <tim.peters@gmail.com> parents: 22988 diff changeset	1347 p = (uchar *)PyObject_Malloc(total);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1348 if (p == NULL)
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1349 return NULL;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1350
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1351 write_size_t(p, nbytes);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1352 memset(p + SST, FORBIDDENBYTE, SST);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1353
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1354 if (nbytes > 0)
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1355 memset(p + 2*SST, CLEANBYTE, nbytes);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1356
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1357 tail = p + 2*SST + nbytes;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1358 memset(tail, FORBIDDENBYTE, SST);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1359 write_size_t(tail + SST, serialno);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1360
38576 82072a8f5267 _PyObject_DebugMalloc(): The return value should add Tim Peters <tim.peters@gmail.com> parents: 38575 diff changeset	1361 return p + 2*SST;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1362 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1363
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1364 /* The debug free first checks the 2*SST bytes on each end for sanity (in
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1365 particular, that the FORBIDDENBYTEs are still intact).
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1366 Then fills the original bytes with DEADBYTE.
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1367 Then calls the underlying free.
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1368 */
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1369 void
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1370 _PyObject_DebugFree(void *p)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1371 {
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1372 uchar q = (uchar )p - 2SST; / address returned from malloc */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1373 size_t nbytes;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1374
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1375 if (p == NULL)
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1376 return;
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1377 _PyObject_DebugCheckAddress(p);
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1378 nbytes = read_size_t(q);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1379 if (nbytes > 0)
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1380 memset(q, DEADBYTE, nbytes);
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1381 PyObject_Free(q);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1382 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1383
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1384 void *
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1385 _PyObject_DebugRealloc(void *p, size_t nbytes)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1386 {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1387 uchar q = (uchar )p;
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1388 uchar *tail;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1389 size_t total; /* nbytes + 4SST /
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1390 size_t original_nbytes;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1391 int i;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1392
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1393 if (p == NULL)
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1394 return _PyObject_DebugMalloc(nbytes);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1395
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1396 _PyObject_DebugCheckAddress(p);
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1397 bumpserialno();
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1398 original_nbytes = read_size_t(q - 2*SST);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1399 total = nbytes + 4*SST;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1400 if (total < nbytes)
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1401 /* overflow: can't represent total as a size_t */
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1402 return NULL;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1403
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1404 if (nbytes < original_nbytes) {
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1405 /* shrinking: mark old extra memory dead */
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1406 memset(q + nbytes, DEADBYTE, original_nbytes - nbytes);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1407 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1408
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1409 /* Resize and add decorations. */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1410 q = (uchar )PyObject_Realloc(q - 2SST, total);
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1411 if (q == NULL)
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1412 return NULL;
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1413
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1414 write_size_t(q, nbytes);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1415 for (i = 0; i < SST; ++i)
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1416 assert(q[SST + i] == FORBIDDENBYTE);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1417 q += 2*SST;
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1418 tail = q + nbytes;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1419 memset(tail, FORBIDDENBYTE, SST);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1420 write_size_t(tail + SST, serialno);
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1421
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1422 if (nbytes > original_nbytes) {
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1423 /* growing: mark new extra memory clean */
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1424 memset(q + original_nbytes, CLEANBYTE,
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1425 nbytes - original_nbytes);
22948 6cb52829da1a SF bug 542181: Realloc behavior Tim Peters <tim.peters@gmail.com> parents: 22860 diff changeset	1426 }
22988 be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1427
be54465a39c4 _PyObject_DebugRealloc(): rewritten to let the underlying realloc do Tim Peters <tim.peters@gmail.com> parents: 22987 diff changeset	1428 return q;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1429 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1430
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1431 /* Check the forbidden bytes on both ends of the memory allocated for p.
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1432 * If anything is wrong, print info to stderr via _PyObject_DebugDumpAddress,
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1433 * and call Py_FatalError to kill the program.
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1434 */
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1435 void
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1436 _PyObject_DebugCheckAddress(const void *p)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1437 {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1438 const uchar q = (const uchar )p;
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1439 char *msg;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1440 size_t nbytes;
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1441 const uchar *tail;
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1442 int i;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1443
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1444 if (p == NULL) {
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1445 msg = "didn't expect a NULL pointer";
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1446 goto error;
f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1447 }
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1448
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1449 /* Check the stuff at the start of p first: if there's underwrite
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1450 * corruption, the number-of-bytes field may be nuts, and checking
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1451 * the tail could lead to a segfault then.
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1452 */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1453 for (i = SST; i >= 1; --i) {
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1454 if (*(q-i) != FORBIDDENBYTE) {
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1455 msg = "bad leading pad byte";
f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1456 goto error;
f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1457 }
f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1458 }
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1459
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1460 nbytes = read_size_t(q - 2*SST);
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1461 tail = q + nbytes;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1462 for (i = 0; i < SST; ++i) {
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1463 if (tail[i] != FORBIDDENBYTE) {
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1464 msg = "bad trailing pad byte";
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1465 goto error;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1466 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1467 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1468
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1469 return;
f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1470
f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1471 error:
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1472 _PyObject_DebugDumpAddress(p);
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1473 Py_FatalError(msg);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1474 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1475
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1476 /* Display info to stderr about the memory block at p. */
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1477 void
22983 1c26a3106653 Move PyObject_Malloc and PyObject_Free here from object.c. Remove Neil Schemenauer <nascheme@enme.ucalgary.ca> parents: 22948 diff changeset	1478 _PyObject_DebugDumpAddress(const void *p)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1479 {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1480 const uchar q = (const uchar )p;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1481 const uchar *tail;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1482 size_t nbytes, serial;
22614 f294fdd18b5b PYMALLOC_DEBUG routines: The "check API family" gimmick was going nowhere Tim Peters <tim.peters@gmail.com> parents: 22487 diff changeset	1483 int i;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1484 int ok;
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1485
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1486 fprintf(stderr, "Debug memory block at address p=%p:\n", p);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1487 if (p == NULL)
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1488 return;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1489
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1490 nbytes = read_size_t(q - 2*SST);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1491 fprintf(stderr, " %" PY_FORMAT_SIZE_T "u bytes originally "
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1492 "requested\n", nbytes);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1493
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1494 /* In case this is nuts, check the leading pad bytes first. */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1495 fprintf(stderr, " The %d pad bytes at p-%d are ", SST, SST);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1496 ok = 1;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1497 for (i = 1; i <= SST; ++i) {
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1498 if (*(q-i) != FORBIDDENBYTE) {
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1499 ok = 0;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1500 break;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1501 }
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1502 }
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1503 if (ok)
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1504 fputs("FORBIDDENBYTE, as expected.\n", stderr);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1505 else {
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1506 fprintf(stderr, "not all FORBIDDENBYTE (0x%02x):\n",
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1507 FORBIDDENBYTE);
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1508 for (i = SST; i >= 1; --i) {
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1509 const uchar byte = *(q-i);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1510 fprintf(stderr, " at p-%d: 0x%02x", i, byte);
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1511 if (byte != FORBIDDENBYTE)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1512 fputs(" *** OUCH", stderr);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1513 fputc('\n', stderr);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1514 }
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1515
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1516 fputs(" Because memory is corrupted at the start, the "
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1517 "count of bytes requested\n"
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1518 " may be bogus, and checking the trailing pad "
5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1519 "bytes may segfault.\n", stderr);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1520 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1521
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1522 tail = q + nbytes;
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1523 fprintf(stderr, " The %d pad bytes at tail=%p are ", SST, tail);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1524 ok = 1;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1525 for (i = 0; i < SST; ++i) {
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1526 if (tail[i] != FORBIDDENBYTE) {
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1527 ok = 0;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1528 break;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1529 }
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1530 }
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1531 if (ok)
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1532 fputs("FORBIDDENBYTE, as expected.\n", stderr);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1533 else {
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1534 fprintf(stderr, "not all FORBIDDENBYTE (0x%02x):\n",
298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1535 FORBIDDENBYTE);
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1536 for (i = 0; i < SST; ++i) {
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1537 const uchar byte = tail[i];
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1538 fprintf(stderr, " at tail+%d: 0x%02x",
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1539 i, byte);
22986 298a7c51d2c0 PYMALLOC_{CLEAN, DEAD, FORBIDDEN}BYTE symbols: remove the PYMALLOC_ Tim Peters <tim.peters@gmail.com> parents: 22983 diff changeset	1540 if (byte != FORBIDDENBYTE)
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1541 fputs(" *** OUCH", stderr);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1542 fputc('\n', stderr);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1543 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1544 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1545
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1546 serial = read_size_t(tail + SST);
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1547 fprintf(stderr, " The block was made by call #%" PY_FORMAT_SIZE_T
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1548 "u to debug malloc/realloc.\n", serial);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1549
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1550 if (nbytes > 0) {
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1551 i = 0;
23298 5a6be8fa8de2 _PyObject_DebugCheckAddress(): If the leading pad bytes are corrupt, Tim Peters <tim.peters@gmail.com> parents: 23159 diff changeset	1552 fputs(" Data at p:", stderr);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1553 /* print up to 8 bytes at the start */
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1554 while (q < tail && i < 8) {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1555 fprintf(stderr, " %02x", *q);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1556 ++i;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1557 ++q;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1558 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1559 /* and up to 8 at the end */
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1560 if (q < tail) {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1561 if (tail - q > 8) {
22484 ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1562 fputs(" ...", stderr);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1563 q = tail - 8;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1564 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1565 while (q < tail) {
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1566 fprintf(stderr, " %02x", *q);
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1567 ++q;
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1568 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1569 }
22484 ffcb2fd2947e Minor code cleanup -- no semantic changes. Tim Peters <tim.peters@gmail.com> parents: 22479 diff changeset	1570 fputc('\n', stderr);
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1571 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1572 }
fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1573
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1574 static size_t
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1575 printone(const char* msg, size_t value)
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1576 {
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1577 int i, k;
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1578 char buf[100];
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1579 size_t origvalue = value;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1580
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1581 fputs(msg, stderr);
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1582 for (i = (int)strlen(msg); i < 35; ++i)
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1583 fputc(' ', stderr);
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1584 fputc('=', stderr);
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1585
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1586 /* Write the value with commas. */
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1587 i = 22;
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1588 buf[i--] = '\0';
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1589 buf[i--] = '\n';
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1590 k = 3;
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1591 do {
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1592 size_t nextvalue = value / 10;
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1593 uint digit = (uint)(value - nextvalue * 10);
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1594 value = nextvalue;
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1595 buf[i--] = (char)(digit + '0');
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1596 --k;
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1597 if (k == 0 && value && i >= 0) {
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1598 k = 3;
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1599 buf[i--] = ',';
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1600 }
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1601 } while (value && i >= 0);
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1602
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1603 while (i >= 0)
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1604 buf[i--] = ' ';
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1605 fputs(buf, stderr);
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1606
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1607 return origvalue;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1608 }
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1609
23159 fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1610 /* Print summary info to stderr about the state of pymalloc's structures.
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1611 * In Py_DEBUG mode, also perform some expensive internal consistency
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1612 * checks.
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1613 */
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1614 void
23020 e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	1615 _PyObject_DebugMallocStats(void)
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1616 {
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1617 uint i;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1618 const uint numclasses = SMALL_REQUEST_THRESHOLD >> ALIGNMENT_SHIFT;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1619 /* # of pools, allocated blocks, and free blocks per class index */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1620 size_t numpools[SMALL_REQUEST_THRESHOLD >> ALIGNMENT_SHIFT];
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1621 size_t numblocks[SMALL_REQUEST_THRESHOLD >> ALIGNMENT_SHIFT];
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1622 size_t numfreeblocks[SMALL_REQUEST_THRESHOLD >> ALIGNMENT_SHIFT];
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1623 /* total # of allocated bytes in used and full pools */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1624 size_t allocated_bytes = 0;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1625 /* total # of available bytes in used pools */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1626 size_t available_bytes = 0;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1627 /* # of free pools + pools not yet carved out of current arena */
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1628 uint numfreepools = 0;
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1629 /* # of bytes for arena alignment padding */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1630 size_t arena_alignment = 0;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1631 /* # of bytes in used and full pools used for pool_headers */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1632 size_t pool_header_bytes = 0;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1633 /* # of bytes in used and full pools wasted due to quantization,
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1634 * i.e. the necessarily leftover space at the ends of used and
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1635 * full pools.
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1636 */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1637 size_t quantization = 0;
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1638 /* # of arenas actually allocated. */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1639 size_t narenas = 0;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1640 /* running total -- should equal narenas * ARENA_SIZE */
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1641 size_t total;
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1642 char buf[128];
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1643
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1644 fprintf(stderr, "Small block threshold = %d, in %u size classes.\n",
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1645 SMALL_REQUEST_THRESHOLD, numclasses);
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1646
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1647 for (i = 0; i < numclasses; ++i)
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1648 numpools[i] = numblocks[i] = numfreeblocks[i] = 0;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1649
22743 7361ec88188a Fixed errors in two comments. Tim Peters <tim.peters@gmail.com> parents: 22741 diff changeset	1650 /* Because full pools aren't linked to from anything, it's easiest
7361ec88188a Fixed errors in two comments. Tim Peters <tim.peters@gmail.com> parents: 22741 diff changeset	1651 * to march over all the arenas. If we're lucky, most of the memory
7361ec88188a Fixed errors in two comments. Tim Peters <tim.peters@gmail.com> parents: 22741 diff changeset	1652 * will be living in full pools -- would be a shame to miss them.
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1653 */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1654 for (i = 0; i < maxarenas; ++i) {
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1655 uint poolsinarena;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1656 uint j;
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1657 uptr base = arenas[i].address;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1658
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1659 /* Skip arenas which are not allocated. */
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1660 if (arenas[i].address == (uptr)NULL)
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1661 continue;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1662 narenas += 1;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1663
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1664 poolsinarena = arenas[i].ntotalpools;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1665 numfreepools += arenas[i].nfreepools;
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1666
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1667 /* round up to pool alignment */
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1668 if (base & (uptr)POOL_SIZE_MASK) {
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1669 arena_alignment += POOL_SIZE;
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1670 base &= ~(uptr)POOL_SIZE_MASK;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1671 base += POOL_SIZE;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1672 }
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1673
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1674 /* visit every pool in the arena */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1675 assert(base <= (uptr) arenas[i].pool_address);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1676 for (j = 0;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1677 base < (uptr) arenas[i].pool_address;
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1678 ++j, base += POOL_SIZE) {
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1679 poolp p = (poolp)base;
23159 fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1680 const uint sz = p->szidx;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1681 uint freeblocks;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1682
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1683 if (p->ref.count == 0) {
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1684 /* currently unused */
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1685 assert(pool_is_in_list(p, arenas[i].freepools));
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1686 continue;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1687 }
23159 fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1688 ++numpools[sz];
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1689 numblocks[sz] += p->ref.count;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1690 freeblocks = NUMBLOCKS(sz) - p->ref.count;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1691 numfreeblocks[sz] += freeblocks;
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1692 #ifdef Py_DEBUG
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1693 if (freeblocks > 0)
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1694 assert(pool_is_in_list(p, usedpools[sz + sz]));
fca379c30906 _PyObject_DebugMallocStats(): Added some potentially expensive internal Tim Peters <tim.peters@gmail.com> parents: 23158 diff changeset	1695 #endif
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1696 }
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1697 }
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1698 assert(narenas == narenas_currently_allocated);
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1699
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1700 fputc('\n', stderr);
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1701 fputs("class size num pools blocks in use avail blocks\n"
04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1702 "----- ---- --------- ------------- ------------\n",
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1703 stderr);
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1704
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1705 for (i = 0; i < numclasses; ++i) {
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1706 size_t p = numpools[i];
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1707 size_t b = numblocks[i];
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1708 size_t f = numfreeblocks[i];
22836 f1f57bf09092 Widespread, but mostly in _PyMalloc_Malloc: optimize away all expensive Tim Peters <tim.peters@gmail.com> parents: 22795 diff changeset	1709 uint size = INDEX2SIZE(i);
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1710 if (p == 0) {
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1711 assert(b == 0 && f == 0);
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1712 continue;
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1713 }
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1714 fprintf(stderr, "%5u %6u "
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1715 "%11" PY_FORMAT_SIZE_T "u "
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1716 "%15" PY_FORMAT_SIZE_T "u "
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1717 "%13" PY_FORMAT_SIZE_T "u\n",
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1718 i, size, p, b, f);
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1719 allocated_bytes += b * size;
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1720 available_bytes += f * size;
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1721 pool_header_bytes += p * POOL_OVERHEAD;
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1722 quantization += p * ((POOL_SIZE - POOL_OVERHEAD) % size);
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1723 }
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1724 fputc('\n', stderr);
23020 e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	1725 (void)printone("# times object malloc called", serialno);
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1726
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1727 (void)printone("# arenas allocated total", ntimes_arena_allocated);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1728 (void)printone("# arenas reclaimed", ntimes_arena_allocated - narenas);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1729 (void)printone("# arenas highwater mark", narenas_highwater);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1730 (void)printone("# arenas allocated current", narenas);
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1731
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1732 PyOS_snprintf(buf, sizeof(buf),
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1733 "%" PY_FORMAT_SIZE_T "u arenas * %d bytes/arena",
5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1734 narenas, ARENA_SIZE);
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1735 (void)printone(buf, narenas * ARENA_SIZE);
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1736
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1737 fputc('\n', stderr);
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1738
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1739 total = printone("# bytes in allocated blocks", allocated_bytes);
23020 e2848618bd19 _PyObject_DebugDumpStats: renamed to _PyObject_DebugMallocStats. Tim Peters <tim.peters@gmail.com> parents: 23009 diff changeset	1740 total += printone("# bytes in available blocks", available_bytes);
22860 04367cff8689 Minor improvements to the stats output dump, including adding commas to Tim Peters <tim.peters@gmail.com> parents: 22838 diff changeset	1741
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1742 PyOS_snprintf(buf, sizeof(buf),
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1743 "%u unused pools * %d bytes", numfreepools, POOL_SIZE);
38575 5722f112d5da In a PYMALLOC_DEBUG build obmalloc adds extra debugging info Tim Peters <tim.peters@gmail.com> parents: 37598 diff changeset	1744 total += printone(buf, (size_t)numfreepools * POOL_SIZE);
22837 ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1745
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1746 total += printone("# bytes lost to pool headers", pool_header_bytes);
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1747 total += printone("# bytes lost to quantization", quantization);
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1748 total += printone("# bytes lost to arena alignment", arena_alignment);
ef2fbce71736 _PyMalloc_DebugDumpStats(): vastly improved the output, and it now Tim Peters <tim.peters@gmail.com> parents: 22836 diff changeset	1749 (void)printone("Total", total);
22724 9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1750 }
9baa8c9a1e84 New PYMALLOC_DEBUG function void _PyMalloc_DebugDumpStats(void). Tim Peters <tim.peters@gmail.com> parents: 22701 diff changeset	1751
22479 fb45791150d1 Give Python a debug-mode pymalloc, much as sketched on Python-Dev. Tim Peters <tim.peters@gmail.com> parents: 22470 diff changeset	1752 #endif /* PYMALLOC_DEBUG */
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1753
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1754 #ifdef Py_USING_MEMORY_DEBUGGER
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1755 /* Make this function last so gcc won't inline it since the definition is
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1756 * after the reference.
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1757 */
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1758 int
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1759 Py_ADDRESS_IN_RANGE(void *P, poolp pool)
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1760 {
37008 685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1761 return pool->arenaindex < maxarenas &&
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1762 (uptr)P - arenas[pool->arenaindex].address < (uptr)ARENA_SIZE &&
685849bd905c Merge the tim-obmalloc branch to the trunk. Tim Peters <tim.peters@gmail.com> parents: 36514 diff changeset	1763 arenas[pool->arenaindex].address != 0;
32278 c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1764 }
c2bc248d3e9c SF bug 881641, make it easier to use valgrind Neal Norwitz <nnorwitz@gmail.com> parents: 29515 diff changeset	1765 #endif

Mercurial > cpython-lru_cache-weakref

annotate Objects/obmalloc.c @ 51330:ca423008fa4a legacy-trunk