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//===----- UnwindInfoRegistrationPlugin.cpp - libunwind registration ------===//
//
// 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/UnwindInfoRegistrationPlugin.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ExecutionEngine/Orc/Shared/MachOObjectFormat.h"
#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#define DEBUG_TYPE "orc"
using namespace llvm::jitlink;
namespace llvm::orc {
Expected<std::shared_ptr<UnwindInfoRegistrationPlugin>>
UnwindInfoRegistrationPlugin::Create(ExecutionSession &ES) {
ExecutorAddr Register, Deregister;
auto &EPC = ES.getExecutorProcessControl();
if (auto Err = EPC.getBootstrapSymbols(
{{Register, rt_alt::UnwindInfoManagerRegisterActionName},
{Deregister, rt_alt::UnwindInfoManagerDeregisterActionName}}))
return std::move(Err);
return std::make_shared<UnwindInfoRegistrationPlugin>(ES, Register,
Deregister);
}
void UnwindInfoRegistrationPlugin::modifyPassConfig(
MaterializationResponsibility &MR, LinkGraph &G,
PassConfiguration &PassConfig) {
PassConfig.PostFixupPasses.push_back(
[this](LinkGraph &G) { return addUnwindInfoRegistrationActions(G); });
}
Error UnwindInfoRegistrationPlugin::addUnwindInfoRegistrationActions(
LinkGraph &G) {
ExecutorAddrRange EHFrameRange, UnwindInfoRange;
std::vector<Block *> CodeBlocks;
auto ScanUnwindInfoSection = [&](Section &Sec, ExecutorAddrRange &SecRange) {
if (Sec.empty())
return;
SecRange.Start = (*Sec.blocks().begin())->getAddress();
for (auto *B : Sec.blocks()) {
auto R = B->getRange();
SecRange.Start = std::min(SecRange.Start, R.Start);
SecRange.End = std::max(SecRange.End, R.End);
for (auto &E : B->edges()) {
if (E.getKind() != Edge::KeepAlive || !E.getTarget().isDefined())
continue;
auto &TargetBlock = E.getTarget().getBlock();
auto &TargetSection = TargetBlock.getSection();
if ((TargetSection.getMemProt() & MemProt::Exec) == MemProt::Exec)
CodeBlocks.push_back(&TargetBlock);
}
}
};
if (auto *EHFrame = G.findSectionByName(MachOEHFrameSectionName))
ScanUnwindInfoSection(*EHFrame, EHFrameRange);
if (auto *UnwindInfo = G.findSectionByName(MachOUnwindInfoSectionName))
ScanUnwindInfoSection(*UnwindInfo, UnwindInfoRange);
if (CodeBlocks.empty())
return Error::success();
if ((EHFrameRange == ExecutorAddrRange() &&
UnwindInfoRange == ExecutorAddrRange()))
return Error::success();
llvm::sort(CodeBlocks, [](const Block *LHS, const Block *RHS) {
return LHS->getAddress() < RHS->getAddress();
});
SmallVector<ExecutorAddrRange> CodeRanges;
for (auto *B : CodeBlocks) {
if (CodeRanges.empty() || CodeRanges.back().End != B->getAddress())
CodeRanges.push_back(B->getRange());
else
CodeRanges.back().End = B->getRange().End;
}
ExecutorAddr DSOBase;
if (auto *DSOBaseSym = G.findAbsoluteSymbolByName(DSOBaseName))
DSOBase = DSOBaseSym->getAddress();
else if (auto *DSOBaseSym = G.findExternalSymbolByName(DSOBaseName))
DSOBase = DSOBaseSym->getAddress();
else if (auto *DSOBaseSym = G.findDefinedSymbolByName(DSOBaseName))
DSOBase = DSOBaseSym->getAddress();
else
return make_error<StringError>("In " + G.getName() +
" could not find dso base symbol",
inconvertibleErrorCode());
using namespace shared;
using SPSRegisterArgs =
SPSArgList<SPSSequence<SPSExecutorAddrRange>, SPSExecutorAddr,
SPSExecutorAddrRange, SPSExecutorAddrRange>;
using SPSDeregisterArgs = SPSArgList<SPSSequence<SPSExecutorAddrRange>>;
G.allocActions().push_back(
{cantFail(WrapperFunctionCall::Create<SPSRegisterArgs>(
Register, CodeRanges, DSOBase, EHFrameRange, UnwindInfoRange)),
cantFail(WrapperFunctionCall::Create<SPSDeregisterArgs>(Deregister,
CodeRanges))});
return Error::success();
}
} // namespace llvm::orc
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