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gh-126835: Rename AST optimization related stuff after moving const folding to the peephole optimizier #131830

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gh-126835: Rename AST optimization related stuff after moving const folding to the peephole optimizier #131830

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c404c1c
rename ast_opt.c -> ast_process.c
WolframAlph Mar 28, 2025
23882e2
_PyASTOptimizeState -> _PyASTProcessState
WolframAlph Mar 28, 2025
c35a501
_PyAST_Optimize -> _PyAST_Process
WolframAlph Mar 28, 2025
0cb1c88
_PyCompile_AstOptimize -> _PyCompile_AstProcess
WolframAlph Mar 28, 2025
77b9317
add news
WolframAlph Mar 28, 2025
0d126cf
address review
WolframAlph Mar 28, 2025
58648da
mention full file path
WolframAlph Mar 28, 2025
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2 changes: 1 addition & 1 deletion .github/CODEOWNERS
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Original file line number Diff line number Diff line change
Expand Up @@ -181,7 +181,7 @@ Include/internal/pycore_time.h @pganssle @abalkin

# AST
Python/ast.c @isidentical @JelleZijlstra @eclips4
Python/ast_opt.c @isidentical @eclips4
Python/ast_process.c @isidentical @eclips4
Parser/asdl.py @isidentical @JelleZijlstra @eclips4
Parser/asdl_c.py @isidentical @JelleZijlstra @eclips4
Lib/ast.py @isidentical @JelleZijlstra @eclips4
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6 changes: 3 additions & 3 deletions Include/internal/pycore_compile.h
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Expand Up @@ -34,16 +34,16 @@ PyAPI_FUNC(PyCodeObject*) _PyAST_Compile(
int optimize,
struct _arena *arena);

/* AST optimizations */
extern int _PyCompile_AstOptimize(
/* AST processing */
extern int _PyCompile_AstProcess(
struct _mod *mod,
PyObject *filename,
PyCompilerFlags *flags,
int optimize,
struct _arena *arena,
int syntax_check_only);

extern int _PyAST_Optimize(
extern int _PyAST_Process(
struct _mod *,
struct _arena *arena,
PyObject *filename,
Expand Down
4 changes: 2 additions & 2 deletions InternalDocs/compiler.md
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Expand Up @@ -505,8 +505,8 @@ Important files
* [Python/ast.c](../Python/ast.c):
Used for validating the AST.

* [Python/ast_opt.c](../Python/ast_opt.c):
Optimizes the AST.
* [Python/ast_process.c](../Python/ast_process.c):
Processes the AST before compiling.

* [Python/ast_unparse.c](../Python/ast_unparse.c):
Converts the AST expression node back into a string (for string annotations).
Expand Down
2 changes: 1 addition & 1 deletion Makefile.pre.in
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Expand Up @@ -426,7 +426,7 @@ PYTHON_OBJS= \
Python/asdl.o \
Python/assemble.o \
Python/ast.o \
Python/ast_opt.o \
Python/ast_process.o \
Python/ast_unparse.o \
Python/bltinmodule.o \
Python/brc.o \
Expand Down
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-03-28-15-06-55.gh-issue-126835.IpcMTn.rst
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@@ -0,0 +1,3 @@
Move constant folding to the peephole optimizer. Rename AST optimization
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Can you say which files were renamed? we have a 3.13 news entry that mentions ast_opt so maybe it's a good idea to say that Python/ast_opt.c is renamed Python/ast_process.c

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Sure, I will.

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While I think it's good to mention the files I don't know if we ever mentioned those structs and functions publicly. If not, no need to mention their renames. Strictly speaking, Python/* files are also all internals so maybe it's not needed to mention them in the end but I found a 3.13 NEWS entry that mentioned it (which is why I suggested this)

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Struct maybe yes because it's private, but _PyAST_Optimize and _PyCompile_AstOptimize are in internal API, aren't they?

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@picnixz picnixz Mar 28, 2025 •
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We actually made the structs private in 3.13:

Make ``_PyASTOptimizeState`` internal to ast_opt.c. Make ``_PyAST_Optimize``
take two integers instead of a pointer to this struct. This avoids the need
to include pycore_compile.h in ast_opt.c.

But we also mentioned _PyAST_Optimize, so we might want to mention the change even if no one should use them.

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You can include it in the news item. No need for what's new.

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Im a bit confused. This is news entry, not what's new. Am I missing something?

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No, I think Irit just wanted to say "keep what you wrote but no need for a What's New entry" (maybe I wasn't clear but the changelog I mentioned also was a simple blurb, not a full-fledged What's New entry)

related files (Python/ast_opt.c -> Python/ast_process.c), structs (_PyASTOptimizeState -> _PyASTProcessState)
and functions (_PyAST_Optimize -> _PyAST_Process, _PyCompile_AstOptimize -> _PyCompile_AstProcess).
2 changes: 1 addition & 1 deletion PCbuild/_freeze_module.vcxproj
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Expand Up @@ -188,7 +188,7 @@
<ClCompile Include="..\Python\asdl.c" />
<ClCompile Include="..\Python\assemble.c" />
<ClCompile Include="..\Python\ast.c" />
<ClCompile Include="..\Python\ast_opt.c" />
<ClCompile Include="..\Python\ast_process.c" />
<ClCompile Include="..\Python\ast_unparse.c" />
<ClCompile Include="..\Python\bltinmodule.c" />
<ClCompile Include="..\Python\brc.c" />
Expand Down
2 changes: 1 addition & 1 deletion PCbuild/_freeze_module.vcxproj.filters
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Expand Up @@ -34,7 +34,7 @@
<ClCompile Include="..\Python\ast.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Python\ast_opt.c">
<ClCompile Include="..\Python\ast_process.c">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="..\Python\ast_unparse.c">
Expand Down
2 changes: 1 addition & 1 deletion PCbuild/pythoncore.vcxproj
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Expand Up @@ -571,7 +571,7 @@
<ClCompile Include="..\Python\asdl.c" />
<ClCompile Include="..\Python\assemble.c" />
<ClCompile Include="..\Python\ast.c" />
<ClCompile Include="..\Python\ast_opt.c" />
<ClCompile Include="..\Python\ast_process.c" />
<ClCompile Include="..\Python\ast_unparse.c" />
<ClCompile Include="..\Python\bltinmodule.c" />
<ClCompile Include="..\Python\bootstrap_hash.c" />
Expand Down
2 changes: 1 addition & 1 deletion PCbuild/pythoncore.vcxproj.filters
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Expand Up @@ -1301,7 +1301,7 @@
<ClCompile Include="..\Python\ast.c">
<Filter>Python</Filter>
</ClCompile>
<ClCompile Include="..\Python\ast_opt.c">
<ClCompile Include="..\Python\ast_process.c">
<Filter>Python</Filter>
</ClCompile>
<ClCompile Include="..\Python\ast_unparse.c">
Expand Down
77 changes: 38 additions & 39 deletions Python/ast_opt.c → Python/ast_process.c
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
/* AST Optimizer */
#include "Python.h"
#include "pycore_ast.h" // _PyAST_GetDocString()
#include "pycore_c_array.h" // _Py_CArray_EnsureCapacity()
Expand All @@ -23,7 +22,7 @@ typedef struct {

_Py_c_array_t cf_finally; /* context for PEP 678 check */
int cf_finally_used;
} _PyASTOptimizeState;
} _PyASTProcessState;

#define ENTER_RECURSIVE() \
if (Py_EnterRecursiveCall(" during compilation")) { \
Expand All @@ -33,14 +32,14 @@ if (Py_EnterRecursiveCall(" during compilation")) { \
#define LEAVE_RECURSIVE() Py_LeaveRecursiveCall();

static ControlFlowInFinallyContext*
get_cf_finally_top(_PyASTOptimizeState *state)
get_cf_finally_top(_PyASTProcessState *state)
{
int idx = state->cf_finally_used;
return ((ControlFlowInFinallyContext*)state->cf_finally.array) + idx;
}

static int
push_cf_context(_PyASTOptimizeState *state, stmt_ty node, bool finally, bool funcdef, bool loop)
push_cf_context(_PyASTProcessState *state, stmt_ty node, bool finally, bool funcdef, bool loop)
{
if (_Py_CArray_EnsureCapacity(&state->cf_finally, state->cf_finally_used+1) < 0) {
return 0;
Expand All @@ -56,14 +55,14 @@ push_cf_context(_PyASTOptimizeState *state, stmt_ty node, bool finally, bool fun
}

static void
pop_cf_context(_PyASTOptimizeState *state)
pop_cf_context(_PyASTProcessState *state)
{
assert(state->cf_finally_used > 0);
state->cf_finally_used--;
}

static int
control_flow_in_finally_warning(const char *kw, stmt_ty n, _PyASTOptimizeState *state)
control_flow_in_finally_warning(const char *kw, stmt_ty n, _PyASTProcessState *state)
{
PyObject *msg = PyUnicode_FromFormat("'%s' in a 'finally' block", kw);
if (msg == NULL) {
Expand All @@ -77,7 +76,7 @@ control_flow_in_finally_warning(const char *kw, stmt_ty n, _PyASTOptimizeState *
}

static int
before_return(_PyASTOptimizeState *state, stmt_ty node_)
before_return(_PyASTProcessState *state, stmt_ty node_)
{
if (state->cf_finally_used > 0) {
ControlFlowInFinallyContext *ctx = get_cf_finally_top(state);
Expand All @@ -91,7 +90,7 @@ before_return(_PyASTOptimizeState *state, stmt_ty node_)
}

static int
before_loop_exit(_PyASTOptimizeState *state, stmt_ty node_, const char *kw)
before_loop_exit(_PyASTProcessState *state, stmt_ty node_, const char *kw)
{
if (state->cf_finally_used > 0) {
ControlFlowInFinallyContext *ctx = get_cf_finally_top(state);
Expand Down Expand Up @@ -366,7 +365,7 @@ optimize_format(expr_ty node, PyObject *fmt, asdl_expr_seq *elts, PyArena *arena
}

static int
fold_binop(expr_ty node, PyArena *arena, _PyASTOptimizeState *state)
fold_binop(expr_ty node, PyArena *arena, _PyASTProcessState *state)
{
if (state->syntax_check_only) {
return 1;
Expand All @@ -390,18 +389,18 @@ fold_binop(expr_ty node, PyArena *arena, _PyASTOptimizeState *state)
return 1;
}

static int astfold_mod(mod_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_arguments(arguments_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_comprehension(comprehension_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_keyword(keyword_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_arg(arg_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_withitem(withitem_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_excepthandler(excepthandler_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_match_case(match_case_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_type_param(type_param_ty node_, PyArena *ctx_, _PyASTOptimizeState *state);
static int astfold_mod(mod_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_arguments(arguments_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_comprehension(comprehension_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_keyword(keyword_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_arg(arg_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_withitem(withitem_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_excepthandler(excepthandler_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_match_case(match_case_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTProcessState *state);
static int astfold_type_param(type_param_ty node_, PyArena *ctx_, _PyASTProcessState *state);

#define CALL(FUNC, TYPE, ARG) \
if (!FUNC((ARG), ctx_, state)) \
Expand Down Expand Up @@ -437,7 +436,7 @@ stmt_seq_remove_item(asdl_stmt_seq *stmts, Py_ssize_t idx)
}

static int
astfold_body(asdl_stmt_seq *stmts, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_body(asdl_stmt_seq *stmts, PyArena *ctx_, _PyASTProcessState *state)
{
int docstring = _PyAST_GetDocString(stmts) != NULL;
if (docstring && (state->optimize >= 2)) {
Expand Down Expand Up @@ -467,7 +466,7 @@ astfold_body(asdl_stmt_seq *stmts, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_mod(mod_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_mod(mod_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
switch (node_->kind) {
case Module_kind:
Expand All @@ -489,7 +488,7 @@ astfold_mod(mod_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
ENTER_RECURSIVE();
switch (node_->kind) {
Expand Down Expand Up @@ -607,14 +606,14 @@ astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_keyword(keyword_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_keyword(keyword_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
CALL(astfold_expr, expr_ty, node_->value);
return 1;
}

static int
astfold_comprehension(comprehension_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_comprehension(comprehension_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
CALL(astfold_expr, expr_ty, node_->target);
CALL(astfold_expr, expr_ty, node_->iter);
Expand All @@ -623,7 +622,7 @@ astfold_comprehension(comprehension_ty node_, PyArena *ctx_, _PyASTOptimizeState
}

static int
astfold_arguments(arguments_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_arguments(arguments_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
CALL_SEQ(astfold_arg, arg, node_->posonlyargs);
CALL_SEQ(astfold_arg, arg, node_->args);
Expand All @@ -636,7 +635,7 @@ astfold_arguments(arguments_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_arg(arg_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_arg(arg_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
if (!(state->ff_features & CO_FUTURE_ANNOTATIONS)) {
CALL_OPT(astfold_expr, expr_ty, node_->annotation);
Expand All @@ -645,7 +644,7 @@ astfold_arg(arg_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
ENTER_RECURSIVE();
switch (node_->kind) {
Expand Down Expand Up @@ -800,7 +799,7 @@ astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_excepthandler(excepthandler_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_excepthandler(excepthandler_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
switch (node_->kind) {
case ExceptHandler_kind:
Expand All @@ -814,15 +813,15 @@ astfold_excepthandler(excepthandler_ty node_, PyArena *ctx_, _PyASTOptimizeState
}

static int
astfold_withitem(withitem_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_withitem(withitem_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
CALL(astfold_expr, expr_ty, node_->context_expr);
CALL_OPT(astfold_expr, expr_ty, node_->optional_vars);
return 1;
}

static int
fold_const_match_patterns(expr_ty node, PyArena *ctx_, _PyASTOptimizeState *state)
fold_const_match_patterns(expr_ty node, PyArena *ctx_, _PyASTProcessState *state)
{
if (state->syntax_check_only) {
return 1;
Expand Down Expand Up @@ -863,7 +862,7 @@ fold_const_match_patterns(expr_ty node, PyArena *ctx_, _PyASTOptimizeState *stat
}

static int
astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
// Currently, this is really only used to form complex/negative numeric
// constants in MatchValue and MatchMapping nodes
Expand Down Expand Up @@ -905,7 +904,7 @@ astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
}

static int
astfold_match_case(match_case_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_match_case(match_case_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
CALL(astfold_pattern, expr_ty, node_->pattern);
CALL_OPT(astfold_expr, expr_ty, node_->guard);
Expand All @@ -914,7 +913,7 @@ astfold_match_case(match_case_ty node_, PyArena *ctx_, _PyASTOptimizeState *stat
}

static int
astfold_type_param(type_param_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
astfold_type_param(type_param_ty node_, PyArena *ctx_, _PyASTProcessState *state)
{
switch (node_->kind) {
case TypeVar_kind:
Expand All @@ -936,11 +935,11 @@ astfold_type_param(type_param_ty node_, PyArena *ctx_, _PyASTOptimizeState *stat
#undef CALL_SEQ

int
_PyAST_Optimize(mod_ty mod, PyArena *arena, PyObject *filename, int optimize,
int ff_features, int syntax_check_only)
_PyAST_Process(mod_ty mod, PyArena *arena, PyObject *filename, int optimize,
int ff_features, int syntax_check_only)
{
_PyASTOptimizeState state;
memset(&state, 0, sizeof(_PyASTOptimizeState));
_PyASTProcessState state;
memset(&state, 0, sizeof(_PyASTProcessState));
state.filename = filename;
state.optimize = optimize;
state.ff_features = ff_features;
Expand Down
2 changes: 1 addition & 1 deletion Python/bltinmodule.c
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Expand Up @@ -847,7 +847,7 @@ builtin_compile_impl(PyObject *module, PyObject *source, PyObject *filename,
goto error;
}
int syntax_check_only = ((flags & PyCF_OPTIMIZED_AST) == PyCF_ONLY_AST); /* unoptiomized AST */
if (_PyCompile_AstOptimize(mod, filename, &cf, optimize,
if (_PyCompile_AstProcess(mod, filename, &cf, optimize,
arena, syntax_check_only) < 0) {
_PyArena_Free(arena);
goto error;
Expand Down
8 changes: 4 additions & 4 deletions Python/compile.c
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Expand Up @@ -134,7 +134,7 @@ compiler_setup(compiler *c, mod_ty mod, PyObject *filename,
c->c_optimize = (optimize == -1) ? _Py_GetConfig()->optimization_level : optimize;
c->c_save_nested_seqs = false;

if (!_PyAST_Optimize(mod, arena, filename, c->c_optimize, merged, 0)) {
if (!_PyAST_Process(mod, arena, filename, c->c_optimize, merged, 0)) {
return ERROR;
}
c->c_st = _PySymtable_Build(mod, filename, &c->c_future);
Expand Down Expand Up @@ -1449,8 +1449,8 @@ _PyAST_Compile(mod_ty mod, PyObject *filename, PyCompilerFlags *pflags,
}

int
_PyCompile_AstOptimize(mod_ty mod, PyObject *filename, PyCompilerFlags *cf,
int optimize, PyArena *arena, int no_const_folding)
_PyCompile_AstProcess(mod_ty mod, PyObject *filename, PyCompilerFlags *cf,
int optimize, PyArena *arena, int no_const_folding)
{
_PyFutureFeatures future;
if (!_PyFuture_FromAST(mod, filename, &future)) {
Expand All @@ -1460,7 +1460,7 @@ _PyCompile_AstOptimize(mod_ty mod, PyObject *filename, PyCompilerFlags *cf,
if (optimize == -1) {
optimize = _Py_GetConfig()->optimization_level;
}
if (!_PyAST_Optimize(mod, arena, filename, optimize, flags, no_const_folding)) {
if (!_PyAST_Process(mod, arena, filename, optimize, flags, no_const_folding)) {
return -1;
}
return 0;
Expand Down
2 changes: 1 addition & 1 deletion Python/pythonrun.c
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Expand Up @@ -1498,7 +1498,7 @@ Py_CompileStringObject(const char *str, PyObject *filename, int start,
}
if (flags && (flags->cf_flags & PyCF_ONLY_AST)) {
int syntax_check_only = ((flags->cf_flags & PyCF_OPTIMIZED_AST) == PyCF_ONLY_AST); /* unoptiomized AST */
if (_PyCompile_AstOptimize(mod, filename, flags, optimize, arena, syntax_check_only) < 0) {
if (_PyCompile_AstProcess(mod, filename, flags, optimize, arena, syntax_check_only) < 0) {
_PyArena_Free(arena);
return NULL;
}
Expand Down
1 change: 0 additions & 1 deletion Tools/c-analyzer/cpython/ignored.tsv
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Expand Up @@ -347,7 +347,6 @@ Objects/unicodeobject.c unicode_translate_call_errorhandler argparse -
Parser/parser.c - reserved_keywords -
Parser/parser.c - soft_keywords -
Parser/lexer/lexer.c - type_comment_prefix -
Python/ast_opt.c fold_unaryop ops -
Python/ceval.c - _PyEval_BinaryOps -
Python/ceval.c - _Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS -
Python/codecs.c - Py_hexdigits -
Expand Down
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