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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"
#define DEBUG_TYPE "orc"
using namespace llvm::jitlink;
namespace llvm::orc {
EHFrameRegistrationPlugin::EHFrameRegistrationPlugin(
ExecutionSession &ES, std::unique_ptr<EHFrameRegistrar> Registrar)
: ES(ES), Registrar(std::move(Registrar)) {}
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(createEHFrameRecorderPass(
LG.getTargetTriple(), [this, &MR](ExecutorAddr Addr, size_t Size) {
if (Addr) {
std::lock_guard<std::mutex> Lock(EHFramePluginMutex);
assert(!InProcessLinks.count(&MR) &&
"Link for MR already being tracked?");
InProcessLinks[&MR] = {Addr, Size};
}
}));
}
Error EHFrameRegistrationPlugin::notifyEmitted(
MaterializationResponsibility &MR) {
ExecutorAddrRange EmittedRange;
{
std::lock_guard<std::mutex> Lock(EHFramePluginMutex);
auto EHFrameRangeItr = InProcessLinks.find(&MR);
if (EHFrameRangeItr == InProcessLinks.end())
return Error::success();
EmittedRange = EHFrameRangeItr->second;
assert(EmittedRange.Start && "eh-frame addr to register can not be null");
InProcessLinks.erase(EHFrameRangeItr);
}
if (auto Err = MR.withResourceKeyDo(
[&](ResourceKey K) { EHFrameRanges[K].push_back(EmittedRange); }))
return Err;
return Registrar->registerEHFrames(EmittedRange);
}
Error EHFrameRegistrationPlugin::notifyFailed(
MaterializationResponsibility &MR) {
std::lock_guard<std::mutex> Lock(EHFramePluginMutex);
InProcessLinks.erase(&MR);
return Error::success();
}
Error EHFrameRegistrationPlugin::notifyRemovingResources(JITDylib &JD,
ResourceKey K) {
std::vector<ExecutorAddrRange> RangesToRemove;
ES.runSessionLocked([&] {
auto I = EHFrameRanges.find(K);
if (I != EHFrameRanges.end()) {
RangesToRemove = std::move(I->second);
EHFrameRanges.erase(I);
}
});
Error Err = Error::success();
while (!RangesToRemove.empty()) {
auto RangeToRemove = RangesToRemove.back();
RangesToRemove.pop_back();
assert(RangeToRemove.Start && "Untracked eh-frame range must not be null");
Err = joinErrors(std::move(Err),
Registrar->deregisterEHFrames(RangeToRemove));
}
return Err;
}
void EHFrameRegistrationPlugin::notifyTransferringResources(
JITDylib &JD, ResourceKey DstKey, ResourceKey SrcKey) {
auto SI = EHFrameRanges.find(SrcKey);
if (SI == EHFrameRanges.end())
return;
auto DI = EHFrameRanges.find(DstKey);
if (DI != EHFrameRanges.end()) {
auto &SrcRanges = SI->second;
auto &DstRanges = DI->second;
DstRanges.reserve(DstRanges.size() + SrcRanges.size());
for (auto &SrcRange : SrcRanges)
DstRanges.push_back(std::move(SrcRange));
EHFrameRanges.erase(SI);
} else {
// We need to move SrcKey's ranges over without invalidating the SI
// iterator.
auto Tmp = std::move(SI->second);
EHFrameRanges.erase(SI);
EHFrameRanges[DstKey] = std::move(Tmp);
}
}
} // namespace llvm::orc
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