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GH-100222: Redefine _Py_CODEUNIT as a union to clarify structure of code unit. (GH-100223)

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Mark Shannon 2022-12-14 11:12:53 +00:00 • committed by GitHub
parent 985a71032b
commit 6997e77bdf
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9 changed files with 150 additions and 134 deletions
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Python/compile.c
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@ -263,22 +263,32 @@ write_instr(_Py_CODEUNIT *codestr, struct instr *instruction, int ilen)
int caches = _PyOpcode_Caches[opcode];
switch (ilen - caches) {
case 4:
*codestr++ = _Py_MAKECODEUNIT(EXTENDED_ARG, (oparg >> 24) & 0xFF);
codestr->opcode = EXTENDED_ARG;
codestr->oparg = (oparg >> 24) & 0xFF;
codestr++;
/* fall through */
case 3:
*codestr++ = _Py_MAKECODEUNIT(EXTENDED_ARG, (oparg >> 16) & 0xFF);
codestr->opcode = EXTENDED_ARG;
codestr->oparg = (oparg >> 16) & 0xFF;
codestr++;
/* fall through */
case 2:
*codestr++ = _Py_MAKECODEUNIT(EXTENDED_ARG, (oparg >> 8) & 0xFF);
codestr->opcode = EXTENDED_ARG;
codestr->oparg = (oparg >> 8) & 0xFF;
codestr++;
/* fall through */
case 1:
*codestr++ = _Py_MAKECODEUNIT(opcode, oparg & 0xFF);
codestr->opcode = opcode;
codestr->oparg = oparg & 0xFF;
codestr++;
break;
default:
Py_UNREACHABLE();
}
while (caches--) {
*codestr++ = _Py_MAKECODEUNIT(CACHE, 0);
codestr->opcode = CACHE;
codestr->oparg = 0;
codestr++;
}
}