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GH-135904: JIT compiler: Support 19 bit branch instructions on AArch64 for Mach-O. (GH-140453)

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* Insert labels into assembly for custom relocation during stencil creation.
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Mark Shannon 2025-10-23 16:45:57 +01:00 • committed by GitHub
parent 95953b692d
commit 61e759c2ee
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4 changed files with 62 additions and 17 deletions
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12
Tools/jit/_stencils.py
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@ -58,6 +58,7 @@ class HoleValue(enum.Enum):
"ARM64_RELOC_PAGE21": "patch_aarch64_21r",
"ARM64_RELOC_PAGEOFF12": "patch_aarch64_12",
"ARM64_RELOC_UNSIGNED": "patch_64",
"CUSTOM_AARCH64_BRANCH19": "patch_aarch64_19r",
# x86_64-pc-windows-msvc:
"IMAGE_REL_AMD64_REL32": "patch_x86_64_32rx",
# aarch64-pc-windows-msvc:
@ -221,6 +222,17 @@ class StencilGroup:
_got: dict[str, int] = dataclasses.field(default_factory=dict, init=False)
_trampolines: set[int] = dataclasses.field(default_factory=set, init=False)
def convert_labels_to_relocations(self) -> None:
for name, hole_plus in self.symbols.items():
if isinstance(name, str) and "_JIT_RELOCATION_" in name:
_, offset = hole_plus
reloc, target = name.split("_JIT_RELOCATION_")
value, symbol = symbol_to_value(target)
hole = Hole(
int(offset), typing.cast(_schema.HoleKind, reloc), value, symbol, 0
)
self.code.holes.append(hole)
def process_relocations(self, known_symbols: dict[str, int]) -> None:
"""Fix up all GOT and internal relocations for this stencil group."""
for hole in self.code.holes.copy():