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gh-87092: refactor assemble() to a number of separate functions, which do not need the compiler struct #102562

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Merged
iritkatriel merged 10 commits into from
Mar 13, 2023
+318 −261
Merged

gh-87092: refactor assemble() to a number of separate functions, which do not need the compiler struct #102562

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8b71935
remove compiler as arg from some codegen functions
iritkatriel Mar 8, 2023
ed9c7d2
prepare_localsplus doesn't need the whole compiler struct
iritkatriel Mar 8, 2023
1232d41
don't pass compiler around so much in assembler stage
iritkatriel Mar 8, 2023
dbf22d1
extract optimize_code_unit() out of assemble()
iritkatriel Mar 9, 2023
db4b2b8
_PyCompile_CodeGen doesn't need to construct a cfg
iritkatriel Mar 9, 2023
9071570
refactor optimize_code_unit further
iritkatriel Mar 9, 2023
4e7857f
unit tests run all of the optimization stage, not just optimize_cfg
iritkatriel Mar 9, 2023
d0166c4
break up assemble() some more
iritkatriel Mar 10, 2023
c9fc294
remove obsolete comment
iritkatriel Mar 10, 2023
0f198b6
tidy up the no-arg representation in unit test instruction sequences
iritkatriel Mar 10, 2023
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_PyCompile_CodeGen doesn't need to construct a cfg
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@iritkatriel
iritkatriel committed Mar 9, 2023
commit db4b2b8feebb18b98d72b1cadeb298f462a9d677
43 changes: 33 additions & 10 deletions Python/compile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9854,6 +9854,38 @@ instructions_to_cfg(PyObject *instructions, cfg_builder *g)
return ERROR;
}

static PyObject *
instr_sequence_to_instructions(instr_sequence *seq) {
PyObject *instructions = PyList_New(0);
if (instructions == NULL) {
return NULL;
}
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,
loc.lineno, loc.end_lineno,
loc.col_offset, loc.end_col_offset);
if (inst_tuple == NULL) {
goto error;
}

int res = PyList_Append(instructions, inst_tuple);
Py_DECREF(inst_tuple);
if (res != 0) {
goto error;
}
}
return instructions;
error:
Py_XDECREF(instructions);
return NULL;
}

static PyObject *
cfg_to_instructions(cfg_builder *g)
{
Expand Down Expand Up @@ -9927,19 +9959,10 @@ _PyCompile_CodeGen(PyObject *ast, PyObject *filename, PyCompilerFlags *pflags,
goto finally;
}

cfg_builder g;
if (instr_sequence_to_cfg(INSTR_SEQUENCE(c), &g) < 0) {
goto finally;
}
if (translate_jump_labels_to_targets(g.g_entryblock) < 0) {
goto finally;
}

res = cfg_to_instructions(&g);
res = instr_sequence_to_instructions(INSTR_SEQUENCE(c));

finally:
compiler_exit_scope(c);
cfg_builder_fini(&g);
compiler_free(c);
_PyArena_Free(arena);
return res;
Expand Down