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67fbfb42bd
In the free threaded build, the `_PyObject_LookupSpecial()` call can lead to reference count contention on the returned function object becuase it doesn't use stackrefs. Refactor some of the callers to use `_PyObject_MaybeCallSpecialNoArgs`, which uses stackrefs internally. This fixes the scaling bottleneck in the "lookup_special" microbenchmark in `ftscalingbench.py`. However, the are still some uses of `_PyObject_LookupSpecial()` that need to be addressed in future PRs.
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* This files contains various key structs that are widely used
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* and do not depend on other headers. */
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#ifndef Py_INTERNAL_STRUCTS_H
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#define Py_INTERNAL_STRUCTS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h> // uint16_t
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typedef struct {
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uint16_t value_and_backoff;
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} _Py_BackoffCounter;
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/* Each instruction in a code object is a fixed-width value,
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* currently 2 bytes: 1-byte opcode + 1-byte oparg. The EXTENDED_ARG
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* opcode allows for larger values but the current limit is 3 uses
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* of EXTENDED_ARG (see Python/compile.c), for a maximum
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* 32-bit value. This aligns with the note in Python/compile.c
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* (compiler_addop_i_line) indicating that the max oparg value is
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* 2**32 - 1, rather than INT_MAX.
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*/
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typedef union {
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uint16_t cache;
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struct {
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uint8_t code;
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uint8_t arg;
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} op;
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_Py_BackoffCounter counter; // First cache entry of specializable op
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} _Py_CODEUNIT;
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/* Abstract tree node. */
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typedef struct {
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PyObject_HEAD
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} PyHamtNode;
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/* An HAMT immutable mapping collection. */
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typedef struct {
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PyObject_HEAD
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PyHamtNode *h_root;
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PyObject *h_weakreflist;
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Py_ssize_t h_count;
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} PyHamtObject;
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typedef struct {
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PyObject_VAR_HEAD
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uint32_t b_bitmap;
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PyObject *b_array[1];
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} PyHamtNode_Bitmap;
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#include "pycore_context.h" // _PyContextTokenMissing
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// Define this to get precise tracking of stackrefs.
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// #define Py_STACKREF_DEBUG 1
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typedef union _PyStackRef {
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#if !defined(Py_GIL_DISABLED) && defined(Py_STACKREF_DEBUG)
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uint64_t index;
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#else
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uintptr_t bits;
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#endif
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} _PyStackRef;
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// A stackref that can be stored in a regular C local variable and be visible
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// to the GC in the free threading build.
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// Used in combination with _PyThreadState_PushCStackRef().
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typedef struct _PyCStackRef {
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_PyStackRef ref;
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#ifdef Py_GIL_DISABLED
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struct _PyCStackRef *next;
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#endif
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} _PyCStackRef;
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#ifdef __cplusplus
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}
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#endif
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#endif /* Py_INTERNAL_STRUCTS_H */
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