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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150094 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-02-08 21:22:43 +00:00
parent ffea03f216
commit 1df91b0e54
8 changed files with 80 additions and 80 deletions
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104
lib/CodeGen/GCStrategy.cpp
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@ -35,9 +35,9 @@
using namespace llvm;
namespace {
/// LowerIntrinsics - This pass rewrites calls to the llvm.gcread or
/// llvm.gcwrite intrinsics, replacing them with simple loads and stores as
/// 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 LowerIntrinsics : public FunctionPass {
@ -47,20 +47,20 @@ namespace {
bool PerformDefaultLowering(Function &F, GCStrategy &Coll);
static bool InsertRootInitializers(Function &F,
AllocaInst **Roots, unsigned Count);
public:
static char ID;
LowerIntrinsics();
const char *getPassName() const;
void getAnalysisUsage(AnalysisUsage &AU) const;
bool doInitialization(Module &M);
bool runOnFunction(Function &F);
};
/// MachineCodeAnalysis - This is a target-independent pass over the machine
/// MachineCodeAnalysis - This is a target-independent pass over the machine
/// 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.
@ -69,25 +69,25 @@ namespace {
GCFunctionInfo *FI;
MachineModuleInfo *MMI;
const TargetInstrInfo *TII;
void FindSafePoints(MachineFunction &MF);
void VisitCallPoint(MachineBasicBlock::iterator MI);
MCSymbol *InsertLabel(MachineBasicBlock &MBB,
MCSymbol *InsertLabel(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
DebugLoc DL) const;
void FindStackOffsets(MachineFunction &MF);
public:
static char ID;
MachineCodeAnalysis();
const char *getPassName() const;
void getAnalysisUsage(AnalysisUsage &AU) const;
bool runOnMachineFunction(MachineFunction &MF);
};
}
// -----------------------------------------------------------------------------
@ -105,12 +105,12 @@ GCStrategy::GCStrategy() :
GCStrategy::~GCStrategy() {
for (iterator I = begin(), E = end(); I != E; ++I)
delete *I;
Functions.clear();
}
bool GCStrategy::initializeCustomLowering(Module &M) { return false; }
bool GCStrategy::performCustomLowering(Function &F) {
dbgs() << "gc " << getName() << " must override performCustomLowering.\n";
llvm_unreachable(0);
@ -139,7 +139,7 @@ INITIALIZE_PASS_END(LowerIntrinsics, "gc-lowering", "GC Lowering", false, false)
FunctionPass *llvm::createGCLoweringPass() {
return new LowerIntrinsics();
}
char LowerIntrinsics::ID = 0;
LowerIntrinsics::LowerIntrinsics()
@ -150,7 +150,7 @@ LowerIntrinsics::LowerIntrinsics()
const char *LowerIntrinsics::getPassName() const {
return "Lower Garbage Collection Instructions";
}
void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const {
FunctionPass::getAnalysisUsage(AU);
AU.addRequired<GCModuleInfo>();
@ -168,22 +168,22 @@ bool LowerIntrinsics::doInitialization(Module &M) {
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isDeclaration() && I->hasGC())
MI->getFunctionInfo(*I); // Instantiate the GC strategy.
bool MadeChange = false;
for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
if (NeedsCustomLoweringPass(**I))
if ((*I)->initializeCustomLowering(M))
MadeChange = true;
return MadeChange;
}
bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
unsigned Count) {
// Scroll past alloca instructions.
BasicBlock::iterator IP = F.getEntryBlock().begin();
while (isa<AllocaInst>(IP)) ++IP;
// Search for initializers in the initial BB.
SmallPtrSet<AllocaInst*,16> InitedRoots;
for (; !CouldBecomeSafePoint(IP); ++IP)
@ -191,10 +191,10 @@ bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
if (AllocaInst *AI =
dyn_cast<AllocaInst>(SI->getOperand(1)->stripPointerCasts()))
InitedRoots.insert(AI);
// Add root initializers.
bool MadeChange = false;
for (AllocaInst **I = Roots, **E = Roots + Count; I != E; ++I)
if (!InitedRoots.count(*I)) {
StoreInst* SI = new StoreInst(ConstantPointerNull::get(cast<PointerType>(
@ -203,7 +203,7 @@ bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
SI->insertAfter(*I);
MadeChange = true;
}
return MadeChange;
}
@ -227,26 +227,26 @@ bool LowerIntrinsics::NeedsCustomLoweringPass(const GCStrategy &C) {
bool LowerIntrinsics::CouldBecomeSafePoint(Instruction *I) {
// The natural definition of instructions which could introduce safe points
// are:
//
//
// - call, invoke (AfterCall, BeforeCall)
// - phis (Loops)
// - invoke, ret, unwind (Exit)
//
//
// However, instructions as seemingly inoccuous as arithmetic can become
// libcalls upon lowering (e.g., div i64 on a 32-bit platform), so instead
// it is necessary to take a conservative approach.
if (isa<AllocaInst>(I) || isa<GetElementPtrInst>(I) ||
isa<StoreInst>(I) || isa<LoadInst>(I))
return false;
// llvm.gcroot is safe because it doesn't do anything at runtime.
if (CallInst *CI = dyn_cast<CallInst>(I))
if (Function *F = CI->getCalledFunction())
if (unsigned IID = F->getIntrinsicID())
if (IID == Intrinsic::gcroot)
return false;
return true;
}
@ -256,15 +256,15 @@ bool LowerIntrinsics::runOnFunction(Function &F) {
// Quick exit for functions that do not use GC.
if (!F.hasGC())
return false;
GCFunctionInfo &FI = getAnalysis<GCModuleInfo>().getFunctionInfo(F);
GCStrategy &S = FI.getStrategy();
bool MadeChange = false;
if (NeedsDefaultLoweringPass(S))
MadeChange |= PerformDefaultLowering(F, S);
bool UseCustomLoweringPass = NeedsCustomLoweringPass(S);
if (UseCustomLoweringPass)
MadeChange |= S.performCustomLowering(F);
@ -282,9 +282,9 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) {
bool LowerWr = !S.customWriteBarrier();
bool LowerRd = !S.customReadBarrier();
bool InitRoots = S.initializeRoots();
SmallVector<AllocaInst*, 32> Roots;
bool MadeChange = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E;) {
@ -320,15 +320,15 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) {
default:
continue;
}
MadeChange = true;
}
}
}
if (Roots.size())
MadeChange |= InsertRootInitializers(F, Roots.begin(), Roots.size());
return MadeChange;
}
@ -354,7 +354,7 @@ void MachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<GCModuleInfo>();
}
MCSymbol *MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
MCSymbol *MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
DebugLoc DL) const {
MCSymbol *Label = MBB.getParent()->getContext().CreateTempSymbol();
@ -365,14 +365,14 @@ MCSymbol *MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
void MachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
// Find the return address (next instruction), too, so as to bracket the call
// instruction.
MachineBasicBlock::iterator RAI = CI;
++RAI;
MachineBasicBlock::iterator RAI = CI;
++RAI;
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)) {
MCSymbol* Label = InsertLabel(*CI->getParent(), RAI, CI->getDebugLoc());
FI->addSafePoint(GC::PostCall, Label, CI->getDebugLoc());
@ -391,7 +391,7 @@ void MachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {
void MachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
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 = TFI->getFrameIndexOffset(MF, RI->Num);
@ -401,15 +401,15 @@ bool MachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
// Quick exit for functions that do not use GC.
if (!MF.getFunction()->hasGC())
return false;
FI = &getAnalysis<GCModuleInfo>().getFunctionInfo(*MF.getFunction());
if (!FI->getStrategy().needsSafePoints())
return false;
TM = &MF.getTarget();
MMI = &getAnalysis<MachineModuleInfo>();
TII = TM->getInstrInfo();
// Find the size of the stack frame.
FI->setFrameSize(MF.getFrameInfo()->getStackSize());
@ -419,9 +419,9 @@ bool MachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
} else {
FindSafePoints(MF);
}
// Find the stack offsets for all roots.
FindStackOffsets(MF);
return false;
}