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GH-112354: END_FOR instruction to only pop one value. (GH-114247)

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* Compiler emits END_FOR; POP_TOP instead of END_FOR. To support tier 2 side exits in loops.
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Mark Shannon 2024-01-24 15:10:17 +00:00 • committed by GitHub
parent 6fadd68da5
commit 981d172f7f
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GPG key ID: B5690EEEBB952194
16 changed files with 238 additions and 184 deletions
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24
Python/bytecodes.c
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@ -265,9 +265,9 @@ dummy_func(
res = NULL;
}
macro(END_FOR) = POP_TOP + POP_TOP;
macro(END_FOR) = POP_TOP;
inst(INSTRUMENTED_END_FOR, (receiver, value --)) {
inst(INSTRUMENTED_END_FOR, (receiver, value -- receiver)) {
TIER_ONE_ONLY
/* Need to create a fake StopIteration error here,
* to conform to PEP 380 */
@ -2550,8 +2550,8 @@ dummy_func(
next_instr[oparg].op.code == INSTRUMENTED_END_FOR);
Py_DECREF(iter);
STACK_SHRINK(1);
/* Jump forward oparg, then skip following END_FOR instruction */
JUMPBY(oparg + 1);
/* Jump forward oparg, then skip following END_FOR and POP_TOP instruction */
JUMPBY(oparg + 2);
DISPATCH();
}
// Common case: no jump, leave it to the code generator
@ -2599,8 +2599,8 @@ dummy_func(
next_instr[oparg].op.code == INSTRUMENTED_END_FOR);
STACK_SHRINK(1);
Py_DECREF(iter);
/* Skip END_FOR */
target = next_instr + oparg + 1;
/* Skip END_FOR and POP_TOP */
target = next_instr + oparg + 2;
}
INSTRUMENTED_JUMP(this_instr, target, PY_MONITORING_EVENT_BRANCH);
}
@ -2621,8 +2621,8 @@ dummy_func(
}
Py_DECREF(iter);
STACK_SHRINK(1);
/* Jump forward oparg, then skip following END_FOR instruction */
JUMPBY(oparg + 1);
/* Jump forward oparg, then skip following END_FOR and POP_TOP instructions */
JUMPBY(oparg + 2);
DISPATCH();
}
}
@ -2667,8 +2667,8 @@ dummy_func(
}
Py_DECREF(iter);
STACK_SHRINK(1);
/* Jump forward oparg, then skip following END_FOR instruction */
JUMPBY(oparg + 1);
/* Jump forward oparg, then skip following END_FOR and POP_TOP instructions */
JUMPBY(oparg + 2);
DISPATCH();
}
}
@ -2709,8 +2709,8 @@ dummy_func(
if (r->len <= 0) {
STACK_SHRINK(1);
Py_DECREF(r);
// Jump over END_FOR instruction.
JUMPBY(oparg + 1);
// Jump over END_FOR and POP_TOP instructions.
JUMPBY(oparg + 2);
DISPATCH();
}
}