#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"
CustomReadBarriers(false),
CustomWriteBarriers(false),
CustomRoots(false),
+ CustomSafePoints(false),
InitRoots(true),
UsesMetadata(false)
{}
return 0;
}
+
+bool GCStrategy::findCustomSafePoints(GCFunctionInfo& FI, MachineFunction &F) {
+ dbgs() << "gc " << getName() << " must override findCustomSafePoints.\n";
+ llvm_unreachable(0);
+ return 0;
+}
+
+
GCFunctionInfo *GCStrategy::insertFunctionInfo(const Function &F) {
GCFunctionInfo *FI = new GCFunctionInfo(F, *this);
Functions.push_back(FI);
// -----------------------------------------------------------------------------
+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();
}
char LowerIntrinsics::ID = 0;
LowerIntrinsics::LowerIntrinsics()
- : FunctionPass(&ID) {}
+ : FunctionPass(ID) {
+ initializeLowerIntrinsicsPass(*PassRegistry::getPassRegistry());
+ }
const char *LowerIntrinsics::getPassName() const {
return "Lower Garbage Collection Instructions";
void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const {
FunctionPass::getAnalysisUsage(AU);
AU.addRequired<GCModuleInfo>();
+ AU.addPreserved<DominatorTree>();
}
/// doInitialization - If this module uses the GC intrinsics, find them now.
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<DominatorTree>())
+ DT->DT->recalculate(F);
+ }
+
return MadeChange;
}
bool LowerRd = !S.customReadBarrier();
bool InitRoots = S.initializeRoots();
- SmallVector<AllocaInst*,32> Roots;
+ SmallVector<AllocaInst*, 32> Roots;
bool MadeChange = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
case Intrinsic::gcwrite:
if (LowerWr) {
// Replace a write barrier with a simple store.
- Value *St = new StoreInst(CI->getArgOperand(0), CI->getArgOperand(2), CI);
+ Value *St = new StoreInst(CI->getArgOperand(0),
+ CI->getArgOperand(2), CI);
CI->replaceAllUsesWith(St);
CI->eraseFromParent();
}
char MachineCodeAnalysis::ID = 0;
MachineCodeAnalysis::MachineCodeAnalysis()
- : MachineFunctionPass(&ID) {}
+ : MachineFunctionPass(ID) {}
const char *MachineCodeAnalysis::getPassName() const {
return "Analyze Machine Code For Garbage Collection";
MachineBasicBlock::iterator RAI = CI;
++RAI;
- if (FI->getStrategy().needsSafePoint(GC::PreCall))
- FI->addSafePoint(GC::PreCall, InsertLabel(*CI->getParent(), CI,
- CI->getDebugLoc()));
+ 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,
- CI->getDebugLoc()));
+ 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) {
BBE = MF.end(); BBI != BBE; ++BBI)
for (MachineBasicBlock::iterator MI = BBI->begin(),
ME = BBI->end(); MI != ME; ++MI)
- if (MI->getDesc().isCall())
+ if (MI->isCall())
VisitCallPoint(MI);
}
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) {
// Find the size of the stack frame.
FI->setFrameSize(MF.getFrameInfo()->getStackSize());
-
+
// Find all safe points.
- FindSafePoints(MF);
+ if (FI->getStrategy().customSafePoints()) {
+ FI->getStrategy().findCustomSafePoints(*FI, MF);
+ } else {
+ FindSafePoints(MF);
+ }
// Find the stack offsets for all roots.
FindStackOffsets(MF);