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gh-148219: Fix JIT+pystats crash: is_terminator fails for base opcodes #148220

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gh-148219: Fix JIT+pystats crash: is_terminator fails for base opcodes #148220

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1 change: 1 addition & 0 deletions Include/cpython/pystats.h
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,7 @@ typedef struct _optimization_stats {
uint64_t jit_code_size;
uint64_t jit_trampoline_size;
uint64_t jit_data_size;
uint64_t jit_got_size;
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@diegorusso diegorusso Apr 7, 2026

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oops, thanks! :)

uint64_t jit_padding_size;
uint64_t jit_freed_memory_size;
uint64_t trace_total_memory_hist[_Py_UOP_HIST_SIZE];
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3 changes: 3 additions & 0 deletions Python/optimizer.c
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Expand Up @@ -602,6 +602,9 @@ static int
is_terminator(const _PyUOpInstruction *uop)
{
int opcode = _PyUop_Uncached[uop->opcode];
if (opcode == 0) {
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@markshannon markshannon Apr 7, 2026

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We probably should remove the line int opcode = _PyUop_Uncached[uop->opcode]; as the only time we should see a TOS caching uop is in the sanity_check function.

Maybe move that line there, and just assert(opcode <= MAX_UOP_ID) here?

opcode = uop->opcode;
}
return (
opcode == _EXIT_TRACE ||
opcode == _DEOPT ||
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