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//===--------- EHFrameRegistrationPlugin.cpp - Register eh-frames ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/EHFrameRegistrationPlugin.h"
#include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"
#include "llvm/ExecutionEngine/Orc/Shared/MachOObjectFormat.h"
#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
#define DEBUG_TYPE "orc"
using namespace llvm::jitlink;
namespace llvm::orc {
Expected<std::unique_ptr<EHFrameRegistrationPlugin>>
EHFrameRegistrationPlugin::Create(ExecutionSession &ES) {
// Lookup addresseses of the registration/deregistration functions in the
// bootstrap map.
ExecutorAddr RegisterEHFrameSectionAllocAction;
ExecutorAddr DeregisterEHFrameSectionAllocAction;
if (auto Err = ES.getExecutorProcessControl().getBootstrapSymbols(
{{RegisterEHFrameSectionAllocAction,
rt::RegisterEHFrameSectionAllocActionName},
{DeregisterEHFrameSectionAllocAction,
rt::DeregisterEHFrameSectionAllocActionName}}))
return std::move(Err);
return std::make_unique<EHFrameRegistrationPlugin>(
RegisterEHFrameSectionAllocAction, DeregisterEHFrameSectionAllocAction);
}
void EHFrameRegistrationPlugin::modifyPassConfig(
MaterializationResponsibility &MR, LinkGraph &LG,
PassConfiguration &PassConfig) {
if (LG.getTargetTriple().isOSBinFormatMachO())
PassConfig.PrePrunePasses.insert(
PassConfig.PrePrunePasses.begin(), [](LinkGraph &G) {
if (auto *CUSec = G.findSectionByName(MachOCompactUnwindSectionName))
G.removeSection(*CUSec);
return Error::success();
});
PassConfig.PostFixupPasses.push_back([this](LinkGraph &G) -> Error {
if (auto *EHFrame = getEHFrameSection(G)) {
using namespace shared;
auto R = SectionRange(*EHFrame).getRange();
G.allocActions().push_back(
{cantFail(
WrapperFunctionCall::Create<SPSArgList<SPSExecutorAddrRange>>(
RegisterEHFrame, R)),
cantFail(
WrapperFunctionCall::Create<SPSArgList<SPSExecutorAddrRange>>(
DeregisterEHFrame, R))});
}
return Error::success();
});
}
} // namespace llvm::orc
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