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gh-116088: Insert bottom checks after all sym_set_...() calls (#116089)

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This changes the `sym_set_...()` functions to return a `bool` which is `false`
when the symbol is `bottom` after the operation.

All calls to such functions now check this result and go to `hit_bottom`,
a special error label that prints a different message and then reports
that it wasn't able to optimize the trace. No executor will be produced
in this case.
This commit is contained in:
Guido van Rossum 2024-02-29 10:55:29 -08:00 • committed by GitHub
parent 3b6f4cadf1
commit 0656509033
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
7 changed files with 106 additions and 47 deletions
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36
Python/optimizer_cases.c.h generated
View file

@ -172,8 +172,12 @@
sym_matches_type(right, &PyLong_Type)) {
REPLACE_OP(this_instr, _NOP, 0, 0);
}
sym_set_type(left, &PyLong_Type);
sym_set_type(right, &PyLong_Type);
if (!sym_set_type(left, &PyLong_Type)) {
goto hit_bottom;
}
if (!sym_set_type(right, &PyLong_Type)) {
goto hit_bottom;
}
break;
}
@ -276,8 +280,12 @@
sym_matches_type(right, &PyFloat_Type)) {
REPLACE_OP(this_instr, _NOP, 0 ,0);
}
sym_set_type(left, &PyFloat_Type);
sym_set_type(right, &PyFloat_Type);
if (!sym_set_type(left, &PyFloat_Type)) {
goto hit_bottom;
}
if (!sym_set_type(right, &PyFloat_Type)) {
goto hit_bottom;
}
break;
}
@ -383,8 +391,12 @@
sym_matches_type(right, &PyUnicode_Type)) {
REPLACE_OP(this_instr, _NOP, 0 ,0);
}
sym_set_type(left, &PyUnicode_Type);
sym_set_type(right, &PyUnicode_Type);
if (!sym_set_type(left, &PyUnicode_Type)) {
goto hit_bottom;
}
if (!sym_set_type(right, &PyUnicode_Type)) {
goto hit_bottom;
}
break;
}
@ -1397,8 +1409,12 @@
_Py_UopsSymbol *callable;
null = stack_pointer[-1 - oparg];
callable = stack_pointer[-2 - oparg];
sym_set_null(null);
sym_set_type(callable, &PyMethod_Type);
if (!sym_set_null(null)) {
goto hit_bottom;
}
if (!sym_set_type(callable, &PyMethod_Type)) {
goto hit_bottom;
}
break;
}
@ -1425,7 +1441,9 @@
self_or_null = stack_pointer[-1 - oparg];
callable = stack_pointer[-2 - oparg];
uint32_t func_version = (uint32_t)this_instr->operand;
sym_set_type(callable, &PyFunction_Type);
if (!sym_set_type(callable, &PyFunction_Type)) {
goto hit_bottom;
}
(void)self_or_null;
(void)func_version;
break;