GH-126910: Allow most native profilers and debuggers to unwind through JIT frames (GH-143548)
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-01-07-23-07-17.gh-issue-126910.d8zdm-.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-01-07-23-07-17.gh-issue-126910.d8zdm-.rst
new file mode 100644
index 0000000..c86bfdb
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-01-07-23-07-17.gh-issue-126910.d8zdm-.rst
@@ -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.
diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py
index c488adb..fa98dcb 100644
--- a/Tools/jit/_targets.py
+++ b/Tools/jit/_targets.py
@@ -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()
@@ -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
)
@@ -615,7 +619,9 @@ 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
