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gh-122313: Clean up deep recursion guarding code in the compiler (GH-122640)

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Add ENTER_RECURSIVE and LEAVE_RECURSIVE macros in ast.c, ast_opt.c and
symtable.c. Remove VISIT_QUIT macro in symtable.c.

The current recursion depth counter only needs to be updated during
normal execution -- all functions should just return an error code
if an error occurs.
This commit is contained in:
Serhiy Storchaka 2024-08-03 12:45:45 +03:00 • committed by GitHub
parent fe0a28d850
commit efcd65cd84
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GPG key ID: B5690EEEBB952194
3 changed files with 164 additions and 162 deletions
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39
Python/ast_opt.c
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@ -15,6 +15,19 @@ typedef struct {
int recursion_limit; /* recursion limit */
} _PyASTOptimizeState;
#define ENTER_RECURSIVE(ST) \
do { \
if (++(ST)->recursion_depth > (ST)->recursion_limit) { \
PyErr_SetString(PyExc_RecursionError, \
"maximum recursion depth exceeded during compilation"); \
return 0; \
} \
} while(0)
#define LEAVE_RECURSIVE(ST) \
do { \
--(ST)->recursion_depth; \
} while(0)
static int
make_const(expr_ty node, PyObject *val, PyArena *arena)
@ -708,11 +721,7 @@ astfold_mod(mod_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
static int
astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
{
if (++state->recursion_depth > state->recursion_limit) {
PyErr_SetString(PyExc_RecursionError,
"maximum recursion depth exceeded during compilation");
return 0;
}
ENTER_RECURSIVE(state);
switch (node_->kind) {
case BoolOp_kind:
CALL_SEQ(astfold_expr, expr, node_->v.BoolOp.values);
@ -811,7 +820,7 @@ astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
case Name_kind:
if (node_->v.Name.ctx == Load &&
_PyUnicode_EqualToASCIIString(node_->v.Name.id, "__debug__")) {
state->recursion_depth--;
LEAVE_RECURSIVE(state);
return make_const(node_, PyBool_FromLong(!state->optimize), ctx_);
}
break;
@ -824,7 +833,7 @@ astfold_expr(expr_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
// No default case, so the compiler will emit a warning if new expression
// kinds are added without being handled here
}
state->recursion_depth--;
LEAVE_RECURSIVE(state);;
return 1;
}
@ -871,11 +880,7 @@ astfold_arg(arg_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
static int
astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
{
if (++state->recursion_depth > state->recursion_limit) {
PyErr_SetString(PyExc_RecursionError,
"maximum recursion depth exceeded during compilation");
return 0;
}
ENTER_RECURSIVE(state);
switch (node_->kind) {
case FunctionDef_kind:
CALL_SEQ(astfold_type_param, type_param, node_->v.FunctionDef.type_params);
@ -999,7 +1004,7 @@ astfold_stmt(stmt_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
// No default case, so the compiler will emit a warning if new statement
// kinds are added without being handled here
}
state->recursion_depth--;
LEAVE_RECURSIVE(state);
return 1;
}
@ -1031,11 +1036,7 @@ astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
// Currently, this is really only used to form complex/negative numeric
// constants in MatchValue and MatchMapping nodes
// We still recurse into all subexpressions and subpatterns anyway
if (++state->recursion_depth > state->recursion_limit) {
PyErr_SetString(PyExc_RecursionError,
"maximum recursion depth exceeded during compilation");
return 0;
}
ENTER_RECURSIVE(state);
switch (node_->kind) {
case MatchValue_kind:
CALL(astfold_expr, expr_ty, node_->v.MatchValue.value);
@ -1067,7 +1068,7 @@ astfold_pattern(pattern_ty node_, PyArena *ctx_, _PyASTOptimizeState *state)
// No default case, so the compiler will emit a warning if new pattern
// kinds are added without being handled here
}
state->recursion_depth--;
LEAVE_RECURSIVE(state);
return 1;
}