forked from OSchip/llvm-project
137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/SmallString.h"
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#include "llvm/ADT/StringExtras.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/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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using namespace llvm;
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static cl::opt<bool>
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EnableARMEHABIDescriptors("arm-enable-ehabi-descriptors", cl::Hidden,
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cl::desc("Generate ARM EHABI tables with unwinding descriptors"),
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cl::init(false));
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ARMException::ARMException(AsmPrinter *A)
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: DwarfException(A) {}
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ARMException::~ARMException() {}
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void ARMException::EndModule() {
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}
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/// BeginFunction - Gather pre-function exception information. Assumes it's
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/// being emitted immediately after the function entry point.
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void ARMException::BeginFunction(const MachineFunction *MF) {
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Asm->OutStreamer.EmitFnStart();
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if (Asm->MF->getFunction()->needsUnwindTableEntry())
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
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Asm->getFunctionNumber()));
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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() {
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if (!Asm->MF->getFunction()->needsUnwindTableEntry())
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Asm->OutStreamer.EmitCantUnwind();
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else {
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
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Asm->getFunctionNumber()));
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if (EnableARMEHABIDescriptors) {
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// Map all labels and get rid of any dead landing pads.
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MMI->TidyLandingPads();
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if (!MMI->getLandingPads().empty()) {
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// Emit references to personality.
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if (const Function * Personality =
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MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
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MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
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Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
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Asm->OutStreamer.EmitPersonality(PerSym);
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}
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// Emit .handlerdata directive.
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Asm->OutStreamer.EmitHandlerData();
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// Emit actual exception table
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EmitExceptionTable();
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}
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}
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}
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Asm->OutStreamer.EmitFnEnd();
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}
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void ARMException::EmitTypeInfos(unsigned TTypeEncoding) {
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const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
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const std::vector<unsigned> &FilterIds = MMI->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 (std::vector<const GlobalVariable *>::const_reverse_iterator
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I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
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const GlobalVariable *GV = *I;
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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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// 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 ? 0 : TypeInfos[TypeID - 1]),
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TTypeEncoding);
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}
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}
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