e2eaf8ded7
The system libunwind on older Darwins does not support JIT registration of
compact-unwind. Since the CompactUnwindManager utility discards redundant
eh-frame FDEs by default we need to remove the compact-unwind section first
when targeting older libunwinds in order to preserve eh-frames.
While LLJIT was already doing this as of eae6d6d18b, MachOPlatform was not.
This was causing buildbot failures in the ORC runtime (e.g. in
https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-RA/3479/).
This patch updates both LLJIT and MachOPlatform to check a bootstrap value,
"darwin-use-ehframes-only", to determine whether to forcibly preserve
eh-frame sections. If this value is present and set to true then compact-unwind
sections will be discarded, causing eh-frames to be preserved. If the value is
absent or set to false then compact-unwind will be used and redundant FDEs in
eh-frames discarded (FDEs that are needed by the compact-unwind section are
always preserved).
rdar://143895614
37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
//===----- DefaultHostBootstrapValues.cpp - Defaults for host process -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ExecutionEngine/Orc/TargetProcess/DefaultHostBootstrapValues.h"
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#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
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#include "llvm/ExecutionEngine/Orc/TargetProcess/RegisterEHFrames.h"
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#ifdef __APPLE__
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#include <dlfcn.h>
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#endif // __APPLE__
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namespace llvm::orc {
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void addDefaultBootstrapValuesForHostProcess(
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StringMap<std::vector<char>> &BootstrapMap,
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StringMap<ExecutorAddr> &BootstrapSymbols) {
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// FIXME: We probably shouldn't set these on Windows?
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BootstrapSymbols[rt::RegisterEHFrameSectionWrapperName] =
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ExecutorAddr::fromPtr(&llvm_orc_registerEHFrameSectionWrapper);
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BootstrapSymbols[rt::DeregisterEHFrameSectionWrapperName] =
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ExecutorAddr::fromPtr(&llvm_orc_deregisterEHFrameSectionWrapper);
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#ifdef __APPLE__
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if (!dlsym(RTLD_DEFAULT, "__unw_add_find_dynamic_unwind_sections"))
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BootstrapMap["darwin-use-ehframes-only"].push_back(1);
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#endif // __APPLE__
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}
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} // namespace llvm::orc
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