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GH-126910: Allow native profilers and debuggers to unwind through JIT frames #143548

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GH-126910: Allow native profilers and debuggers to unwind through JIT frames #143548

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d76d264
Reserve the frame pointer in JIT code
brandtbucher Nov 27, 2025
c214c07
shim -> trampoline
brandtbucher Nov 28, 2025
8cfff6f
trampoline -> shim
brandtbucher Jan 8, 2026
766d404
Clean up
brandtbucher Jan 8, 2026
ae8649f
blurb add
brandtbucher Jan 8, 2026
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-01-07-23-07-17.gh-issue-126910.d8zdm-.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Set frame pointers in ``x86_64-unknown-linux-gnu`` JIT code, allowing
most native profilers and debuggers to unwind through them.
14 changes: 10 additions & 4 deletions Tools/jit/_targets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ class _Target(typing.Generic[_S, _R]):
debug: bool = False
verbose: bool = False
cflags: str = ""
frame_pointers: bool = False
llvm_version: str = _llvm._LLVM_VERSION
known_symbols: dict[str, int] = dataclasses.field(default_factory=dict)
pyconfig_dir: pathlib.Path = pathlib.Path.cwd().resolve()
Expand Down Expand Up @@ -174,10 +175,13 @@ async def _compile(
"-o",
f"{s}",
f"{c}",
*self.args,
# Allow user-provided CFLAGS to override any defaults
*shlex.split(self.cflags),
]
if self.frame_pointers:
frame_pointer = "all" if opname == "shim" else "reserved"
args_s += ["-Xclang", f"-mframe-pointer={frame_pointer}"]
args_s += self.args
# Allow user-provided CFLAGS to override any defaults
args_s += shlex.split(self.cflags)
await _llvm.run(
"clang", args_s, echo=self.verbose, llvm_version=self.llvm_version
)
Expand Down Expand Up @@ -613,7 +617,9 @@ def get_target(host: str) -> _COFF32 | _COFF64 | _ELF | _MachO:
condition = "defined(__x86_64__) && defined(__linux__)"
args = ["-fno-pic", "-mcmodel=medium", "-mlarge-data-threshold=0", "-fno-plt"]
optimizer = _optimizers.OptimizerX86
target = _ELF(host, condition, args=args, optimizer=optimizer)
target = _ELF(
host, condition, args=args, optimizer=optimizer, frame_pointers=True
)
else:
raise ValueError(host)
return target
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