Mercurial > cpython-lru_cache-weakref
diff Python/compile.c @ 32711:c7c9b68ddda2 legacy-trunk
Treat None as a constant.
| author | Raymond Hettinger <python@rcn.com> |
|---|---|
| date | Fri, 16 Jul 2004 12:16:48 +0000 |
| parents | 87d196e1c2d0 |
| children | 0e890ac1c0f2 |
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--- a/Python/compile.c Fri Jul 16 11:45:00 2004 +0000 +++ b/Python/compile.c Fri Jul 16 12:16:48 2004 +0000 @@ -363,12 +363,13 @@ } static PyObject * -optimize_code(PyObject *code, PyObject* consts) +optimize_code(PyObject *code, PyObject* consts, PyObject *names) { int i, j, codelen; int tgt, tgttgt, opcode; unsigned char *codestr; unsigned int *blocks; + char *name; /* Make a modifiable copy of the code string */ if (!PyString_Check(code)) @@ -418,6 +419,21 @@ continue; SETARG(codestr, i, (j^1)); codestr[i+3] = NOP; + + /* Replace LOAD_GLOBAL/LOAD_NAME None with LOAD_CONST None */ + case LOAD_NAME: + case LOAD_GLOBAL: + j = GETARG(codestr, i); + name = PyString_AsString(PyTuple_GET_ITEM(names, j)); + if (name == NULL || strcmp(name, "None") != 0) + continue; + for (j=0 ; j < PyTuple_GET_SIZE(consts) ; j++) { + if (PyTuple_GET_ITEM(consts, j) == Py_None) { + codestr[i] = LOAD_CONST; + SETARG(codestr, i, j); + break; + } + } break; /* Skip over LOAD_CONST trueconst JUMP_IF_FALSE xx POP_TOP. @@ -441,7 +457,7 @@ continue; if (!ISBASICBLOCK(blocks,i,6)) continue; - if (GETARG(codestr, i) == 2 && \ + if (GETARG(codestr, i) == 2 && GETARG(codestr, i+3) == 2) { codestr[i] = ROT_TWO; codestr[i+1] = JUMP_FORWARD; @@ -450,7 +466,7 @@ codestr[i+5] = NOP; continue; } - if (GETARG(codestr, i) == 3 && \ + if (GETARG(codestr, i) == 3 && GETARG(codestr, i+3) == 3) { codestr[i] = ROT_THREE; codestr[i+1] = ROT_TWO; @@ -542,7 +558,7 @@ co->co_nlocals = nlocals; co->co_stacksize = stacksize; co->co_flags = flags; - co->co_code = optimize_code(code, consts); + co->co_code = optimize_code(code, consts, names); Py_INCREF(consts); co->co_consts = consts; Py_INCREF(names);