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Use low bit of LOAD_GLOBAL's oparg to indicate whether it should push an additional NULL. (GH-31933)

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Mark Shannon 2022-03-17 16:14:57 +00:00 • committed by GitHub
parent ef1327e3b6
commit 3011a097bd
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7 changed files with 212 additions and 196 deletions
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15
Python/compile.c
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@ -1000,7 +1000,7 @@ stack_effect(int opcode, int oparg, int jump)
return -1;
case LOAD_GLOBAL:
return 1;
return (oparg & 1) + 1;
/* Exception handling pseudo-instructions */
case SETUP_FINALLY:
@ -4185,8 +4185,12 @@ compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx)
assert(op);
arg = compiler_add_o(dict, mangled);
Py_DECREF(mangled);
if (arg < 0)
if (arg < 0) {
return 0;
}
if (op == LOAD_GLOBAL) {
arg <<= 1;
}
return compiler_addop_i(c, op, arg);
}
@ -8812,6 +8816,13 @@ optimize_basic_block(struct compiler *c, basicblock *bb, PyObject *consts)
break;
case KW_NAMES:
break;
case PUSH_NULL:
if (nextop == LOAD_GLOBAL && (inst[1].i_opcode & 1) == 0) {
inst->i_opcode = NOP;
inst->i_oparg = 0;
inst[1].i_oparg |= 1;
}
break;
default:
/* All HAS_CONST opcodes should be handled with LOAD_CONST */
assert (!HAS_CONST(inst->i_opcode));