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map cells to arg slots at code creation time (closes #12399)

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This removes nested loops in PyEval_EvalCodeEx.
This commit is contained in:
Benjamin Peterson 2011-06-25 22:54:45 -05:00
parent 935fa016f4
commit 9003760991
4 changed files with 89 additions and 79 deletions
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96
Objects/codeobject.c
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@ -51,7 +51,8 @@ PyCode_New(int argcount, int kwonlyargcount,
PyObject *lnotab)
{
PyCodeObject *co;
Py_ssize_t i;
unsigned char *cell2arg = NULL;
Py_ssize_t i, n_cellvars;
/* Check argument types */
if (argcount < 0 || kwonlyargcount < 0 || nlocals < 0 ||
@ -68,12 +69,13 @@ PyCode_New(int argcount, int kwonlyargcount,
PyErr_BadInternalCall();
return NULL;
}
n_cellvars = PyTuple_GET_SIZE(cellvars);
intern_strings(names);
intern_strings(varnames);
intern_strings(freevars);
intern_strings(cellvars);
/* Intern selected string constants */
for (i = PyTuple_Size(consts); --i >= 0; ) {
for (i = PyTuple_GET_SIZE(consts); --i >= 0; ) {
PyObject *v = PyTuple_GetItem(consts, i);
if (!PyUnicode_Check(v))
continue;
@ -81,35 +83,67 @@ PyCode_New(int argcount, int kwonlyargcount,
continue;
PyUnicode_InternInPlace(&PyTuple_GET_ITEM(consts, i));
}
co = PyObject_NEW(PyCodeObject, &PyCode_Type);
if (co != NULL) {
co->co_argcount = argcount;
co->co_kwonlyargcount = kwonlyargcount;
co->co_nlocals = nlocals;
co->co_stacksize = stacksize;
co->co_flags = flags;
Py_INCREF(code);
co->co_code = code;
Py_INCREF(consts);
co->co_consts = consts;
Py_INCREF(names);
co->co_names = names;
Py_INCREF(varnames);
co->co_varnames = varnames;
Py_INCREF(freevars);
co->co_freevars = freevars;
Py_INCREF(cellvars);
co->co_cellvars = cellvars;
Py_INCREF(filename);
co->co_filename = filename;
Py_INCREF(name);
co->co_name = name;
co->co_firstlineno = firstlineno;
Py_INCREF(lnotab);
co->co_lnotab = lnotab;
co->co_zombieframe = NULL;
co->co_weakreflist = NULL;
/* Create mapping between cells and arguments if needed. */
if (n_cellvars) {
Py_ssize_t total_args = argcount + kwonlyargcount +
((flags & CO_VARARGS) != 0) + ((flags & CO_VARKEYWORDS) != 0);
Py_ssize_t alloc_size = sizeof(unsigned char) * n_cellvars;
int used_cell2arg = 0;
cell2arg = PyMem_MALLOC(alloc_size);
if (cell2arg == NULL)
return NULL;
memset(cell2arg, CO_CELL_NOT_AN_ARG, alloc_size);
/* Find cells which are also arguments. */
for (i = 0; i < n_cellvars; i++) {
Py_ssize_t j;
PyObject *cell = PyTuple_GET_ITEM(cellvars, i);
for (j = 0; j < total_args; j++) {
PyObject *arg = PyTuple_GET_ITEM(varnames, j);
if (!PyUnicode_Compare(cell, arg)) {
cell2arg[i] = j;
used_cell2arg = 1;
break;
}
}
}
if (!used_cell2arg) {
PyMem_FREE(cell2arg);
cell2arg = NULL;
}
}
co = PyObject_NEW(PyCodeObject, &PyCode_Type);
if (co == NULL) {
if (cell2arg)
PyMem_FREE(cell2arg);
return NULL;
}
co->co_argcount = argcount;
co->co_kwonlyargcount = kwonlyargcount;
co->co_nlocals = nlocals;
co->co_stacksize = stacksize;
co->co_flags = flags;
Py_INCREF(code);
co->co_code = code;
Py_INCREF(consts);
co->co_consts = consts;
Py_INCREF(names);
co->co_names = names;
Py_INCREF(varnames);
co->co_varnames = varnames;
Py_INCREF(freevars);
co->co_freevars = freevars;
Py_INCREF(cellvars);
co->co_cellvars = cellvars;
co->co_cell2arg = cell2arg;
Py_INCREF(filename);
co->co_filename = filename;
Py_INCREF(name);
co->co_name = name;
co->co_firstlineno = firstlineno;
Py_INCREF(lnotab);
co->co_lnotab = lnotab;
co->co_zombieframe = NULL;
co->co_weakreflist = NULL;
return co;
}
@ -330,6 +364,8 @@ code_dealloc(PyCodeObject *co)
Py_XDECREF(co->co_filename);
Py_XDECREF(co->co_name);
Py_XDECREF(co->co_lnotab);
if (co->co_cell2arg != NULL)
PyMem_FREE(co->co_cell2arg);
if (co->co_zombieframe != NULL)
PyObject_GC_Del(co->co_zombieframe);
if (co->co_weakreflist != NULL)