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7561d48095
an MCSymbol. Make the EH_LABEL MachineInstr hold its label with an MCSymbol instead of ID. Fix a bug in MMI.cpp which would return labels named "Label4" instead of "label4". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98463 91177308-0d34-0410-b5e6-96231b3b80d8
305 lines
10 KiB
C++
305 lines
10 KiB
C++
//===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===//
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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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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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using namespace llvm::dwarf;
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// Handle the Pass registration stuff necessary to use TargetData's.
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static RegisterPass<MachineModuleInfo>
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X("machinemoduleinfo", "Machine Module Information");
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char MachineModuleInfo::ID = 0;
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// Out of line virtual method.
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MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
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//===----------------------------------------------------------------------===//
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MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI)
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: ImmutablePass(&ID), Context(MAI),
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ObjFileMMI(0), NextLabelIDToReturn(1),
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CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0), DbgInfoAvailable(false){
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// Always emit some info, by default "no personality" info.
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Personalities.push_back(NULL);
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}
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MachineModuleInfo::MachineModuleInfo()
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: ImmutablePass(&ID), Context(*(MCAsmInfo*)0) {
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assert(0 && "This MachineModuleInfo constructor should never be called, MMI "
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"should always be explicitly constructed by LLVMTargetMachine");
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abort();
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}
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MachineModuleInfo::~MachineModuleInfo() {
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delete ObjFileMMI;
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}
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/// doInitialization - Initialize the state for a new module.
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///
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bool MachineModuleInfo::doInitialization() {
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return false;
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}
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/// doFinalization - Tear down the state after completion of a module.
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///
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bool MachineModuleInfo::doFinalization() {
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return false;
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}
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/// getLabelSym - Turn a label ID into a symbol.
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MCSymbol *MachineModuleInfo::getLabelSym(unsigned ID) {
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return Context.GetOrCreateTemporarySymbol
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(Twine(Context.getAsmInfo().getPrivateGlobalPrefix()) + "label" +Twine(ID));
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}
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/// EndFunction - Discard function meta information.
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///
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void MachineModuleInfo::EndFunction() {
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// Clean up frame info.
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FrameMoves.clear();
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// Clean up exception info.
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LandingPads.clear();
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CallSiteMap.clear();
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TypeInfos.clear();
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FilterIds.clear();
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FilterEnds.clear();
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CallsEHReturn = 0;
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CallsUnwindInit = 0;
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VariableDbgInfo.clear();
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}
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/// AnalyzeModule - Scan the module for global debug information.
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///
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void MachineModuleInfo::AnalyzeModule(Module &M) {
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// Insert functions in the llvm.used array (but not llvm.compiler.used) into
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// UsedFunctions.
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GlobalVariable *GV = M.getGlobalVariable("llvm.used");
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if (!GV || !GV->hasInitializer()) return;
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// Should be an array of 'i8*'.
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ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
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if (InitList == 0) return;
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
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if (Function *F =
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dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts()))
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UsedFunctions.insert(F);
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}
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//===-EH-------------------------------------------------------------------===//
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/// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
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/// specified MachineBasicBlock.
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LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
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(MachineBasicBlock *LandingPad) {
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unsigned N = LandingPads.size();
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for (unsigned i = 0; i < N; ++i) {
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LandingPadInfo &LP = LandingPads[i];
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if (LP.LandingPadBlock == LandingPad)
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return LP;
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}
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LandingPads.push_back(LandingPadInfo(LandingPad));
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return LandingPads[N];
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}
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/// addInvoke - Provide the begin and end labels of an invoke style call and
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/// associate it with a try landing pad block.
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void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
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MCSymbol *BeginLabel, MCSymbol *EndLabel) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.BeginLabels.push_back(BeginLabel);
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LP.EndLabels.push_back(EndLabel);
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}
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/// addLandingPad - Provide the label of a try LandingPad block.
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///
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MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
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MCSymbol *LandingPadLabel = getLabelSym(NextLabelID());
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.LandingPadLabel = LandingPadLabel;
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return LandingPadLabel;
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}
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/// addPersonality - Provide the personality function for the exception
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/// information.
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void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
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Function *Personality) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.Personality = Personality;
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for (unsigned i = 0; i < Personalities.size(); ++i)
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if (Personalities[i] == Personality)
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return;
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// If this is the first personality we're adding go
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// ahead and add it at the beginning.
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if (Personalities[0] == NULL)
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Personalities[0] = Personality;
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else
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Personalities.push_back(Personality);
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}
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/// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
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///
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void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
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std::vector<GlobalVariable *> &TyInfo) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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for (unsigned N = TyInfo.size(); N; --N)
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LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
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}
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/// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
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///
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void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
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std::vector<GlobalVariable *> &TyInfo) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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std::vector<unsigned> IdsInFilter(TyInfo.size());
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for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
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IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
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LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
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}
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/// addCleanup - Add a cleanup action for a landing pad.
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///
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void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.TypeIds.push_back(0);
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}
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/// TidyLandingPads - Remap landing pad labels and remove any deleted landing
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/// pads.
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void MachineModuleInfo::TidyLandingPads() {
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for (unsigned i = 0; i != LandingPads.size(); ) {
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LandingPadInfo &LandingPad = LandingPads[i];
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if (LandingPad.LandingPadLabel && !LandingPad.LandingPadLabel->isDefined())
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LandingPad.LandingPadLabel = 0;
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// Special case: we *should* emit LPs with null LP MBB. This indicates
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// "nounwind" case.
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if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
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LandingPads.erase(LandingPads.begin() + i);
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continue;
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}
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for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
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MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
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MCSymbol *EndLabel = LandingPad.EndLabels[j];
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if (BeginLabel->isDefined() && EndLabel->isDefined()) continue;
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LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
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LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
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--j, --e;
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}
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// Remove landing pads with no try-ranges.
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if (LandingPads[i].BeginLabels.empty()) {
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LandingPads.erase(LandingPads.begin() + i);
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continue;
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}
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// If there is no landing pad, ensure that the list of typeids is empty.
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// If the only typeid is a cleanup, this is the same as having no typeids.
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if (!LandingPad.LandingPadBlock ||
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(LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
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LandingPad.TypeIds.clear();
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++i;
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}
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}
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/// getTypeIDFor - Return the type id for the specified typeinfo. This is
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/// function wide.
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unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
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for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
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if (TypeInfos[i] == TI) return i + 1;
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TypeInfos.push_back(TI);
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return TypeInfos.size();
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}
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/// getFilterIDFor - Return the filter id for the specified typeinfos. This is
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/// function wide.
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int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
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// If the new filter coincides with the tail of an existing filter, then
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// re-use the existing filter. Folding filters more than this requires
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// re-ordering filters and/or their elements - probably not worth it.
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for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
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E = FilterEnds.end(); I != E; ++I) {
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unsigned i = *I, j = TyIds.size();
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while (i && j)
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if (FilterIds[--i] != TyIds[--j])
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goto try_next;
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if (!j)
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// The new filter coincides with range [i, end) of the existing filter.
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return -(1 + i);
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try_next:;
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}
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// Add the new filter.
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int FilterID = -(1 + FilterIds.size());
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FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
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for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
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FilterIds.push_back(TyIds[I]);
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FilterEnds.push_back(FilterIds.size());
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FilterIds.push_back(0); // terminator
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return FilterID;
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}
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/// getPersonality - Return the personality function for the current function.
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Function *MachineModuleInfo::getPersonality() const {
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// FIXME: Until PR1414 will be fixed, we're using 1 personality function per
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// function
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return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
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}
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/// getPersonalityIndex - Return unique index for current personality
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/// function. NULL/first personality function should always get zero index.
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unsigned MachineModuleInfo::getPersonalityIndex() const {
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const Function* Personality = NULL;
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// Scan landing pads. If there is at least one non-NULL personality - use it.
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for (unsigned i = 0; i != LandingPads.size(); ++i)
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if (LandingPads[i].Personality) {
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Personality = LandingPads[i].Personality;
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break;
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}
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for (unsigned i = 0; i < Personalities.size(); ++i) {
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if (Personalities[i] == Personality)
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return i;
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}
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// This will happen if the current personality function is
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// in the zero index.
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return 0;
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}
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