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gh-117288: Allocate fewer label IDs in _PyCfg_ToInstructionSequence (#117290)

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Irit Katriel 2024-03-27 17:38:19 +00:00 • committed by GitHub
parent 74c8568d07
commit 262fb911ab
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4 changed files with 37 additions and 6 deletions
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34
Python/compile.c
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@ -235,6 +235,28 @@ _PyCompile_InstructionSequence_UseLabel(instr_sequence *seq, int lbl)
return SUCCESS;
}
int
_PyCompile_InstructionSequence_ApplyLabelMap(instr_sequence *instrs)
{
/* Replace labels by offsets in the code */
for (int i=0; i < instrs->s_used; i++) {
instruction *instr = &instrs->s_instrs[i];
if (HAS_TARGET(instr->i_opcode)) {
assert(instr->i_oparg < instrs->s_labelmap_size);
instr->i_oparg = instrs->s_labelmap[instr->i_oparg];
}
_PyCompile_ExceptHandlerInfo *hi = &instr->i_except_handler_info;
if (hi->h_label >= 0) {
assert(hi->h_label < instrs->s_labelmap_size);
hi->h_label = instrs->s_labelmap[hi->h_label];
}
}
/* Clear label map so it's never used again */
PyMem_Free(instrs->s_labelmap);
instrs->s_labelmap = NULL;
instrs->s_labelmap_size = 0;
return SUCCESS;
}
#define MAX_OPCODE 511
@ -7824,11 +7846,8 @@ instr_sequence_to_instructions(instr_sequence *seq)
for (int i = 0; i < seq->s_used; i++) {
instruction *instr = &seq->s_instrs[i];
location loc = instr->i_loc;
int arg = HAS_TARGET(instr->i_opcode) ?
seq->s_labelmap[instr->i_oparg] : instr->i_oparg;
PyObject *inst_tuple = Py_BuildValue(
"(iiiiii)", instr->i_opcode, arg,
"(iiiiii)", instr->i_opcode, instr->i_oparg,
loc.lineno, loc.end_lineno,
loc.col_offset, loc.end_col_offset);
if (inst_tuple == NULL) {
@ -7855,6 +7874,9 @@ cfg_to_instructions(cfg_builder *g)
if (_PyCfg_ToInstructionSequence(g, &seq) < 0) {
return NULL;
}
if (_PyCompile_InstructionSequence_ApplyLabelMap(&seq) < 0) {
return NULL;
}
PyObject *res = instr_sequence_to_instructions(&seq);
instr_sequence_fini(&seq);
return res;
@ -8026,6 +8048,10 @@ _PyCompile_CodeGen(PyObject *ast, PyObject *filename, PyCompilerFlags *pflags,
goto finally;
}
if (_PyCompile_InstructionSequence_ApplyLabelMap(INSTR_SEQUENCE(c)) < 0) {
return NULL;
}
PyObject *insts = instr_sequence_to_instructions(INSTR_SEQUENCE(c));
if (insts == NULL) {
goto finally;