X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FGCStrategy.cpp;h=766c6ee542a94cf0e7fe3980d82140d21bfcff24;hb=3f5beede1bb97ba4e06dc300e00b70e1013e7216;hp=af5abad537bfd2406528bf758996d640c0095609;hpb=c23197a26f34f559ea9797de51e187087c039c42;p=oota-llvm.git diff --git a/lib/CodeGen/GCStrategy.cpp b/lib/CodeGen/GCStrategy.cpp index af5abad537b..766c6ee542a 100644 --- a/lib/CodeGen/GCStrategy.cpp +++ b/lib/CodeGen/GCStrategy.cpp @@ -19,16 +19,18 @@ #include "llvm/CodeGen/Passes.h" #include "llvm/IntrinsicInst.h" #include "llvm/Module.h" +#include "llvm/Analysis/Dominators.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineModuleInfo.h" -#include "llvm/Target/TargetFrameInfo.h" +#include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetRegisterInfo.h" -#include "llvm/Support/Compiler.h" +#include "llvm/Support/Debug.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/raw_ostream.h" using namespace llvm; @@ -38,7 +40,7 @@ namespace { /// llvm.gcwrite intrinsics, replacing them with simple loads and stores as /// directed by the GCStrategy. It also performs automatic root initialization /// and custom intrinsic lowering. - class VISIBILITY_HIDDEN LowerIntrinsics : public FunctionPass { + class LowerIntrinsics : public FunctionPass { static bool NeedsDefaultLoweringPass(const GCStrategy &C); static bool NeedsCustomLoweringPass(const GCStrategy &C); static bool CouldBecomeSafePoint(Instruction *I); @@ -62,7 +64,7 @@ namespace { /// function representation to identify safe points for the garbage collector /// in the machine code. It inserts labels at safe points and populates a /// GCMetadata record for each function. - class VISIBILITY_HIDDEN MachineCodeAnalysis : public MachineFunctionPass { + class MachineCodeAnalysis : public MachineFunctionPass { const TargetMachine *TM; GCFunctionInfo *FI; MachineModuleInfo *MMI; @@ -70,8 +72,9 @@ namespace { void FindSafePoints(MachineFunction &MF); void VisitCallPoint(MachineBasicBlock::iterator MI); - unsigned InsertLabel(MachineBasicBlock &MBB, - MachineBasicBlock::iterator MI) const; + MCSymbol *InsertLabel(MachineBasicBlock &MBB, + MachineBasicBlock::iterator MI, + DebugLoc DL) const; void FindStackOffsets(MachineFunction &MF); @@ -108,7 +111,7 @@ GCStrategy::~GCStrategy() { bool GCStrategy::initializeCustomLowering(Module &M) { return false; } bool GCStrategy::performCustomLowering(Function &F) { - cerr << "gc " << getName() << " must override performCustomLowering.\n"; + dbgs() << "gc " << getName() << " must override performCustomLowering.\n"; llvm_unreachable(0); return 0; } @@ -121,6 +124,11 @@ GCFunctionInfo *GCStrategy::insertFunctionInfo(const Function &F) { // ----------------------------------------------------------------------------- +INITIALIZE_PASS_BEGIN(LowerIntrinsics, "gc-lowering", "GC Lowering", + false, false) +INITIALIZE_PASS_DEPENDENCY(GCModuleInfo) +INITIALIZE_PASS_END(LowerIntrinsics, "gc-lowering", "GC Lowering", false, false) + FunctionPass *llvm::createGCLoweringPass() { return new LowerIntrinsics(); } @@ -128,7 +136,9 @@ FunctionPass *llvm::createGCLoweringPass() { char LowerIntrinsics::ID = 0; LowerIntrinsics::LowerIntrinsics() - : FunctionPass(&ID) {} + : FunctionPass(ID) { + initializeLowerIntrinsicsPass(*PassRegistry::getPassRegistry()); + } const char *LowerIntrinsics::getPassName() const { return "Lower Garbage Collection Instructions"; @@ -137,6 +147,7 @@ const char *LowerIntrinsics::getPassName() const { void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const { FunctionPass::getAnalysisUsage(AU); AU.addRequired(); + AU.addPreserved(); } /// doInitialization - If this module uses the GC intrinsics, find them now. @@ -179,9 +190,10 @@ bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots, for (AllocaInst **I = Roots, **E = Roots + Count; I != E; ++I) if (!InitedRoots.count(*I)) { - new StoreInst(ConstantPointerNull::get(cast( - cast((*I)->getType())->getElementType())), - *I, IP); + StoreInst* SI = new StoreInst(ConstantPointerNull::get(cast( + cast((*I)->getType())->getElementType())), + *I); + SI->insertAfter(*I); MadeChange = true; } @@ -246,9 +258,16 @@ bool LowerIntrinsics::runOnFunction(Function &F) { if (NeedsDefaultLoweringPass(S)) MadeChange |= PerformDefaultLowering(F, S); - if (NeedsCustomLoweringPass(S)) + bool UseCustomLoweringPass = NeedsCustomLoweringPass(S); + if (UseCustomLoweringPass) MadeChange |= S.performCustomLowering(F); - + + // Custom lowering may modify the CFG, so dominators must be recomputed. + if (UseCustomLoweringPass) { + if (DominatorTree *DT = getAnalysisIfAvailable()) + DT->DT->recalculate(F); + } + return MadeChange; } @@ -257,7 +276,7 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) { bool LowerRd = !S.customReadBarrier(); bool InitRoots = S.initializeRoots(); - SmallVector Roots; + SmallVector Roots; bool MadeChange = false; for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) { @@ -268,7 +287,8 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) { case Intrinsic::gcwrite: if (LowerWr) { // Replace a write barrier with a simple store. - Value *St = new StoreInst(CI->getOperand(1), CI->getOperand(3), CI); + Value *St = new StoreInst(CI->getArgOperand(0), + CI->getArgOperand(2), CI); CI->replaceAllUsesWith(St); CI->eraseFromParent(); } @@ -276,7 +296,7 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) { case Intrinsic::gcread: if (LowerRd) { // Replace a read barrier with a simple load. - Value *Ld = new LoadInst(CI->getOperand(2), "", CI); + Value *Ld = new LoadInst(CI->getArgOperand(1), "", CI); Ld->takeName(CI); CI->replaceAllUsesWith(Ld); CI->eraseFromParent(); @@ -287,7 +307,7 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) { // Initialize the GC root, but do not delete the intrinsic. The // backend needs the intrinsic to flag the stack slot. Roots.push_back(cast( - CI->getOperand(1)->stripPointerCasts())); + CI->getArgOperand(0)->stripPointerCasts())); } break; default: @@ -314,7 +334,7 @@ FunctionPass *llvm::createGCMachineCodeAnalysisPass() { char MachineCodeAnalysis::ID = 0; MachineCodeAnalysis::MachineCodeAnalysis() - : MachineFunctionPass(&ID) {} + : MachineFunctionPass(ID) {} const char *MachineCodeAnalysis::getPassName() const { return "Analyze Machine Code For Garbage Collection"; @@ -327,12 +347,11 @@ void MachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const { AU.addRequired(); } -unsigned MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB, - MachineBasicBlock::iterator MI) const { - unsigned Label = MMI->NextLabelID(); - // N.B. we assume that MI is *not* equal to the "end()" iterator. - BuildMI(MBB, MI, MI->getDebugLoc(), - TII->get(TargetInstrInfo::GC_LABEL)).addImm(Label); +MCSymbol *MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB, + MachineBasicBlock::iterator MI, + DebugLoc DL) const { + MCSymbol *Label = MBB.getParent()->getContext().CreateTempSymbol(); + BuildMI(MBB, MI, DL, TII->get(TargetOpcode::GC_LABEL)).addSym(Label); return Label; } @@ -342,11 +361,15 @@ void MachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) { MachineBasicBlock::iterator RAI = CI; ++RAI; - if (FI->getStrategy().needsSafePoint(GC::PreCall)) - FI->addSafePoint(GC::PreCall, InsertLabel(*CI->getParent(), CI)); + if (FI->getStrategy().needsSafePoint(GC::PreCall)) { + MCSymbol* Label = InsertLabel(*CI->getParent(), CI, CI->getDebugLoc()); + FI->addSafePoint(GC::PreCall, Label, CI->getDebugLoc()); + } - if (FI->getStrategy().needsSafePoint(GC::PostCall)) - FI->addSafePoint(GC::PostCall, InsertLabel(*CI->getParent(), RAI)); + if (FI->getStrategy().needsSafePoint(GC::PostCall)) { + MCSymbol* Label = InsertLabel(*CI->getParent(), RAI, CI->getDebugLoc()); + FI->addSafePoint(GC::PostCall, Label, CI->getDebugLoc()); + } } void MachineCodeAnalysis::FindSafePoints(MachineFunction &MF) { @@ -359,12 +382,12 @@ void MachineCodeAnalysis::FindSafePoints(MachineFunction &MF) { } void MachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) { - const TargetRegisterInfo *TRI = TM->getRegisterInfo(); - assert(TRI && "TargetRegisterInfo not available!"); + const TargetFrameLowering *TFI = TM->getFrameLowering(); + assert(TFI && "TargetRegisterInfo not available!"); for (GCFunctionInfo::roots_iterator RI = FI->roots_begin(), RE = FI->roots_end(); RI != RE; ++RI) - RI->StackOffset = TRI->getFrameIndexOffset(MF, RI->Num); + RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num); } bool MachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {