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gh-142543: Mark tracer functions as Py_NO_INLINE by Fidget-Spinner · Pull Request #142846 · python/cpython · GitHub

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gh-142543: Mark tracer functions as Py_NO_INLINE #142846

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Merged
Fidget-Spinner merged 5 commits into from
Dec 17, 2025
+6 −3
Conversation 3 Commits 5 Checks 62 Files changed 2
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gh-142543: Mark tracer functions as Py_NO_INLINE #142846

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7fced44
Mark tracer function as Py_NO_INLINE
Fidget-Spinner Dec 16, 2025
8f854b8
mark more things as noinline
Fidget-Spinner Dec 16, 2025
87ceff2
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 16, 2025
8ff4a63
add comments
Fidget-Spinner Dec 16, 2025
04cf03a
Merge branch 'no_inilne_tracer' of github.com:Fidget-Spinner/cpython …
Fidget-Spinner Dec 16, 2025
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-12-16-23-26-41.gh-issue-142543.wJKjBs.rst
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@@ -0,0 +1 @@
Fix a stack overflow on Clang JIT build configurations with full LTO.
8 changes: 5 additions & 3 deletions Python/optimizer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -582,7 +582,8 @@ is_terminator(const _PyUOpInstruction *uop)

/* Returns 1 on success (added to trace), 0 on trace end.
*/
int
// gh-142543: inlining this function causes stack overflows
Py_NO_INLINE int
_PyJit_translate_single_bytecode_to_trace(
PyThreadState *tstate,
_PyInterpreterFrame *frame,
Expand Down Expand Up @@ -994,7 +995,8 @@ _PyJit_translate_single_bytecode_to_trace(
}

// Returns 0 for do not enter tracing, 1 on enter tracing.
int
// gh-142543: inlining this function causes stack overflows
Py_NO_INLINE int
_PyJit_TryInitializeTracing(
PyThreadState *tstate, _PyInterpreterFrame *frame, _Py_CODEUNIT *curr_instr,
_Py_CODEUNIT *start_instr, _Py_CODEUNIT *close_loop_instr, int curr_stackdepth, int chain_depth,
Expand Down Expand Up @@ -1066,7 +1068,7 @@ _PyJit_TryInitializeTracing(
return 1;
}

void
Py_NO_INLINE void
_PyJit_FinalizeTracing(PyThreadState *tstate)
{
_PyThreadStateImpl *_tstate = (_PyThreadStateImpl *)tstate;
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