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bpo-46841: Add a _Py_SET_OPCODE macro #31780

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Mar 12, 2022
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bpo-46841: Add a _Py_SET_OPCODE macro #31780

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371b2b0
Add a _Py_SET_OPCODE macro
brandtbucher Mar 9, 2022
ca98da7
Fix illegal aliasing
brandtbucher Mar 12, 2022
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3 changes: 3 additions & 0 deletions Include/cpython/code.h
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,9 @@ typedef uint16_t _Py_CODEUNIT;
# define _Py_MAKECODEUNIT(opcode, oparg) ((opcode)|((oparg)<<8))
#endif

// Use "unsigned char" instead of "uint8_t" here to avoid illegal aliasing:
#define _Py_SET_OPCODE(word, opcode) (((unsigned char *)&(word))[0] = (opcode))


/* Bytecode object */
struct PyCodeObject {
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2 changes: 1 addition & 1 deletion Python/ceval.c
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Expand Up @@ -5517,7 +5517,7 @@ opname ## _miss: \
_Py_CODEUNIT *counter = (_Py_CODEUNIT *)next_instr; \
*counter -= 1; \
if (*counter == 0) { \
next_instr[-1] = _Py_MAKECODEUNIT(opname ## _ADAPTIVE, _Py_OPARG(next_instr[-1])); \
_Py_SET_OPCODE(next_instr[-1], opname ## _ADAPTIVE); \
STAT_INC(opname, deopt); \
*counter = ADAPTIVE_CACHE_BACKOFF; \
} \
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