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bpo-44187: Quickening infrastructure (GH-26264)

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* Add co_firstinstr field to code object.

* Implement barebones quickening.

* Use non-quickened bytecode when tracing.

* Add NEWS item

* Add new file to Windows build.

* Don't specialize instructions with EXTENDED_ARG.
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Mark Shannon 2021-06-07 18:38:06 +01:00 • committed by GitHub
parent 89e50ab36f
commit 001eb520b5
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12 changed files with 416 additions and 12 deletions
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13
Include/cpython/code.h
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@ -7,9 +7,11 @@ typedef uint16_t _Py_CODEUNIT;
#ifdef WORDS_BIGENDIAN
# define _Py_OPCODE(word) ((word) >> 8)
# define _Py_OPARG(word) ((word) & 255)
# define _Py_MAKECODEUNIT(opcode, oparg) (((opcode)<<8)|(oparg))
#else
# define _Py_OPCODE(word) ((word) & 255)
# define _Py_OPARG(word) ((word) >> 8)
# define _Py_MAKECODEUNIT(opcode, oparg) ((opcode)|((oparg)<<8))
#endif
typedef struct _PyOpcache _PyOpcache;
@ -43,16 +45,20 @@ struct PyCodeObject {
/* These fields are set with provided values on new code objects. */
// The hottest fields (in the eval loop) are grouped here at the top.
PyObject *co_code; /* instruction opcodes */
PyObject *co_consts; /* list (constants used) */
PyObject *co_names; /* list of strings (names used) */
_Py_CODEUNIT *co_firstinstr; /* Pointer to first instruction, used for quickening */
PyObject *co_exceptiontable; /* Byte string encoding exception handling table */
int co_flags; /* CO_..., see below */
int co_warmup; /* Warmup counter for quickening */
// The rest are not so impactful on performance.
int co_argcount; /* #arguments, except *args */
int co_posonlyargcount; /* #positional only arguments */
int co_kwonlyargcount; /* #keyword only arguments */
int co_stacksize; /* #entries needed for evaluation stack */
int co_firstlineno; /* first source line number */
PyObject *co_code; /* instruction opcodes */
PyObject *co_varnames; /* tuple of strings (local variable names) */
PyObject *co_cellvars; /* tuple of strings (cell variable names) */
PyObject *co_freevars; /* tuple of strings (free variable names) */
@ -60,7 +66,6 @@ struct PyCodeObject {
PyObject *co_name; /* unicode (name, for reference) */
PyObject *co_linetable; /* string (encoding addr<->lineno mapping) See
Objects/lnotab_notes.txt for details. */
PyObject *co_exceptiontable; /* Byte string encoding exception handling table */
/* These fields are set with computed values on new code objects. */
@ -78,6 +83,10 @@ struct PyCodeObject {
Type is a void* to keep the format private in codeobject.c to force
people to go through the proper APIs. */
void *co_extra;
/* Quickened instructions and cache, or NULL
This should be treated as opaque by all code except the specializer and
interpreter. */
union _cache_or_instruction *co_quickened;
/* Per opcodes just-in-time cache
*