4af73d7ebb
The existing behaviors and callbacks were overlapping and had very confusing semantics: beginBasicBlock/endBasicBlock were not always called, beginFragment/endFragment seemed like they were meant to mean the same thing, but were slightly different, etc. This resulted in confusing semantics, virtual method overloads, and control flow. Remove the above, and replace with new beginBasicBlockSection and endBasicBlockSection callbacks. And document them. These are always called before the first and after the last blocks in a function, even when basic-block-sections are disabled.
134 lines
4.4 KiB
C++
134 lines
4.4 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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void ARMException::markFunctionEnd() {
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if (shouldEmitCFI)
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Asm->OutStreamer->emitCFIEndProc();
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DwarfCFIExceptionBase::markFunctionEnd();
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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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