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GH-93516: Speedup line number checks when tracing. (GH-93763)

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* Use a lookup table to reduce overhead of getting line numbers during tracing.
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Mark Shannon 2022-06-20 13:00:42 +01:00 • committed by GitHub
parent 45e62a2bc1
commit ab0e601016
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6 changed files with 101 additions and 8 deletions
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4
Include/cpython/code.h
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@ -62,7 +62,8 @@ typedef uint16_t _Py_CODEUNIT;
PyObject *co_exceptiontable; /* Byte string encoding exception handling \
table */ \
int co_flags; /* CO_..., see below */ \
int co_warmup; /* Warmup counter for quickening */ \
short co_warmup; /* Warmup counter for quickening */ \
short _co_linearray_entry_size; /* Size of each entry in _co_linearray */ \
\
/* The rest are not so impactful on performance. */ \
int co_argcount; /* #arguments, except *args */ \
@ -90,6 +91,7 @@ typedef uint16_t _Py_CODEUNIT;
PyObject *co_weakreflist; /* to support weakrefs to code objects */ \
void *_co_code; /* cached co_code object/attribute */ \
int _co_firsttraceable; /* index of first traceable instruction */ \
char *_co_linearray; /* array of line offsets */ \
/* Scratch space for extra data relating to the code object. \
Type is a void* to keep the format private in codeobject.c to force \
people to go through the proper APIs. */ \

29
Include/internal/pycore_code.h
View file

@ -461,6 +461,35 @@ adaptive_counter_backoff(uint16_t counter) {
}
/* Line array cache for tracing */
extern int _PyCode_CreateLineArray(PyCodeObject *co);
static inline int
_PyCode_InitLineArray(PyCodeObject *co)
{
if (co->_co_linearray) {
return 0;
}
return _PyCode_CreateLineArray(co);
}
static inline int
_PyCode_LineNumberFromArray(PyCodeObject *co, int index)
{
assert(co->_co_linearray != NULL);
assert(index >= 0);
assert(index < Py_SIZE(co));
if (co->_co_linearray_entry_size == 2) {
return ((int16_t *)co->_co_linearray)[index];
}
else {
assert(co->_co_linearray_entry_size == 4);
return ((int32_t *)co->_co_linearray)[index];
}
}
#ifdef __cplusplus
}
#endif