128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
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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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//
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// This file contains support for writing DWARF exception info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfException.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/IR/Function.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCStreamer.h"
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using namespace llvm;
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ARMException::ARMException(AsmPrinter *A) : DwarfCFIExceptionBase(A) {}
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ARMException::~ARMException() = default;
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ARMTargetStreamer &ARMException::getTargetStreamer() {
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MCTargetStreamer &TS = *Asm->OutStreamer->getTargetStreamer();
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return static_cast<ARMTargetStreamer &>(TS);
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}
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void ARMException::beginFunction(const MachineFunction *MF) {
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if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
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getTargetStreamer().emitFnStart();
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// See if we need call frame info.
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AsmPrinter::CFISection CFISecType = Asm->getFunctionCFISectionType(*MF);
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assert(CFISecType != AsmPrinter::CFISection::EH &&
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"non-EH CFI not yet supported in prologue with EHABI lowering");
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if (CFISecType == AsmPrinter::CFISection::Debug) {
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if (!hasEmittedCFISections) {
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if (Asm->getModuleCFISectionType() == AsmPrinter::CFISection::Debug)
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Asm->OutStreamer->emitCFISections(false, true);
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hasEmittedCFISections = true;
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}
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shouldEmitCFI = true;
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Asm->OutStreamer->emitCFIStartProc(false);
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}
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}
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/// endFunction - Gather and emit post-function exception information.
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///
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void ARMException::endFunction(const MachineFunction *MF) {
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ARMTargetStreamer &ATS = getTargetStreamer();
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const Function &F = MF->getFunction();
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const Function *Per = nullptr;
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if (F.hasPersonalityFn())
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Per = dyn_cast<Function>(F.getPersonalityFn()->stripPointerCasts());
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bool forceEmitPersonality =
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F.hasPersonalityFn() && !isNoOpWithoutInvoke(classifyEHPersonality(Per)) &&
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F.needsUnwindTableEntry();
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bool shouldEmitPersonality = forceEmitPersonality ||
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!MF->getLandingPads().empty();
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if (!Asm->MF->getFunction().needsUnwindTableEntry() &&
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!shouldEmitPersonality)
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ATS.emitCantUnwind();
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else if (shouldEmitPersonality) {
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// Emit references to personality.
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if (Per) {
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MCSymbol *PerSym = Asm->getSymbol(Per);
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ATS.emitPersonality(PerSym);
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}
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// Emit .handlerdata directive.
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ATS.emitHandlerData();
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// Emit actual exception table
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emitExceptionTable();
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}
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if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
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ATS.emitFnEnd();
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}
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void ARMException::emitTypeInfos(unsigned TTypeEncoding,
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MCSymbol *TTBaseLabel) {
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const MachineFunction *MF = Asm->MF;
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const std::vector<const GlobalValue *> &TypeInfos = MF->getTypeInfos();
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const std::vector<unsigned> &FilterIds = MF->getFilterIds();
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bool VerboseAsm = Asm->OutStreamer->isVerboseAsm();
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int Entry = 0;
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// Emit the Catch TypeInfos.
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if (VerboseAsm && !TypeInfos.empty()) {
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Asm->OutStreamer->AddComment(">> Catch TypeInfos <<");
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Asm->OutStreamer->addBlankLine();
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Entry = TypeInfos.size();
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}
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for (const GlobalValue *GV : reverse(TypeInfos)) {
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if (VerboseAsm)
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Asm->OutStreamer->AddComment("TypeInfo " + Twine(Entry--));
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Asm->emitTTypeReference(GV, TTypeEncoding);
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}
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Asm->OutStreamer->emitLabel(TTBaseLabel);
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// Emit the Exception Specifications.
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if (VerboseAsm && !FilterIds.empty()) {
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Asm->OutStreamer->AddComment(">> Filter TypeInfos <<");
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Asm->OutStreamer->addBlankLine();
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Entry = 0;
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}
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for (std::vector<unsigned>::const_iterator
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I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
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unsigned TypeID = *I;
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if (VerboseAsm) {
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--Entry;
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if (TypeID != 0)
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Asm->OutStreamer->AddComment("FilterInfo " + Twine(Entry));
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}
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Asm->emitTTypeReference((TypeID == 0 ? nullptr : TypeInfos[TypeID - 1]),
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TTypeEncoding);
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}
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}
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