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annotate Python/pyarena.c @ 36065:ea083efdc96c legacy-trunk

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Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines, simplifies a lot of error handling code, and fixes many memory leaks.
author Neal Norwitz <nnorwitz@gmail.com>
date Sat, 17 Dec 2005 20:54:49 +0000
parents
children de16a85c3b4c
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rev   line source
36065
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
Neal Norwitz <nnorwitz@gmail.com>
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diff changeset
1 #include "Python.h"
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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2 #include "pyarena.h"
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3
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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4 /* An arena list is a linked list that can store either pointers or
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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5 PyObjects. The type is clear from context.
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6 */
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7
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8 typedef struct _arena_list {
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9 struct _arena_list *al_next;
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10 void *al_pointer;
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11 } PyArenaList;
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12
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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13 /* There are two linked lists in an arena, one for malloc pointers and
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14 one for PyObject. For each list, there is a pointer to the head
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15 and to the tail. The head is used to free the list. The tail is
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16 used to add a new element to the list.
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17
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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18 The list always keeps one un-used node at the end of the list.
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19 */
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20
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21 struct _arena {
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22 PyArenaList *a_malloc_head;
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23 PyArenaList *a_malloc_tail;
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24 PyArenaList *a_object_head;
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25 PyArenaList *a_object_tail;
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26 };
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27
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28 static PyArenaList*
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29 PyArenaList_New(void)
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30 {
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31 PyArenaList *alist = (PyArenaList *)malloc(sizeof(PyArenaList));
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32 if (!alist)
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33 return NULL;
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34
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35 alist->al_next = NULL;
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36 alist->al_pointer = NULL;
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37 return alist;
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38 }
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39
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40 static void
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41 PyArenaList_FreeObject(PyArenaList *alist)
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42 {
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43 if (!alist)
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44 return;
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45
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46 while (alist) {
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47 PyArenaList *prev;
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48 Py_XDECREF((PyObject *)alist->al_pointer);
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49 alist->al_pointer = NULL;
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50 prev = alist;
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51 alist = alist->al_next;
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52 free(prev);
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53 }
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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54 }
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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55
ea083efdc96c Merge from ast-arena. This reduces the code in Python/ast.c by ~300 lines,
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56 static void
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57 PyArenaList_FreeMalloc(PyArenaList *alist)
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58 {
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59 if (!alist)
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60 return;
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61
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62 while (alist) {
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63 PyArenaList *prev;
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64 if (alist->al_pointer) {
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65 free(alist->al_pointer);
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66 }
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67 alist->al_pointer = NULL;
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68 prev = alist;
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69 alist = alist->al_next;
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70 free(prev);
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71 }
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72 }
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73
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74
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75 PyArena *
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76 PyArena_New()
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77 {
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78 PyArena* arena = (PyArena *)malloc(sizeof(PyArena));
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79 if (!arena)
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80 return NULL;
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81
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82 arena->a_object_head = PyArenaList_New();
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83 arena->a_object_tail = arena->a_object_head;
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84 arena->a_malloc_head = PyArenaList_New();
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85 arena->a_malloc_tail = arena->a_malloc_head;
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86 return arena;
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87 }
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88
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89 void
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90 PyArena_Free(PyArena *arena)
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91 {
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92 assert(arena);
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93 PyArenaList_FreeObject(arena->a_object_head);
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94 PyArenaList_FreeMalloc(arena->a_malloc_head);
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95 free(arena);
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96 }
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97
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98 void *
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99 PyArena_Malloc(PyArena *arena, size_t size)
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100 {
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101 /* A better implementation might actually use an arena. The current
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102 approach is just a trivial implementation of the API that allows
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103 it to be tested.
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104 */
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105 void *p;
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106 assert(size != 0);
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107 p = malloc(size);
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108 PyArena_AddMallocPointer(arena, p);
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109 return p;
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110 }
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111
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112 int
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113 PyArena_AddMallocPointer(PyArena *arena, void *pointer)
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114 {
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115 assert(pointer);
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116 PyArenaList *tail = arena->a_malloc_tail;
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117 assert(tail->al_pointer != pointer);
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118 tail->al_next = PyArenaList_New();
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119 tail->al_pointer = pointer;
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120 arena->a_malloc_tail = tail->al_next;
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121 return 1;
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122 }
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123
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124 int
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125 PyArena_AddPyObject(PyArena *arena, PyObject *pointer)
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126 {
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127 assert(pointer);
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128 PyArenaList *tail = arena->a_object_tail;
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129 tail->al_next = PyArenaList_New();
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130 tail->al_pointer = pointer;
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131 arena->a_object_tail = tail->al_next;
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132 return 1;
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133 }