-//===-- Collector.cpp - Garbage collection infrastructure -----------------===//
+//===-- GCStrategy.cpp - Garbage collection infrastructure -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file implements target- and collector-independent garbage collection
// infrastructure.
//
+// MachineCodeAnalysis identifies the GC safe points in the machine code. Roots
+// are identified in SelectionDAGISel.
+//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/GCStrategy.h"
#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/Support/Compiler.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
/// LowerIntrinsics - This pass rewrites calls to the llvm.gcread or
/// llvm.gcwrite intrinsics, replacing them with simple loads and stores as
- /// directed by the Collector. It also performs automatic root initialization
+ /// directed by the GCStrategy. It also performs automatic root initialization
/// and custom intrinsic lowering.
- class VISIBILITY_HIDDEN LowerIntrinsics : public FunctionPass {
- static bool NeedsDefaultLoweringPass(const Collector &C);
- static bool NeedsCustomLoweringPass(const Collector &C);
+ class LowerIntrinsics : public FunctionPass {
+ static bool NeedsDefaultLoweringPass(const GCStrategy &C);
+ static bool NeedsCustomLoweringPass(const GCStrategy &C);
static bool CouldBecomeSafePoint(Instruction *I);
- bool PerformDefaultLowering(Function &F, Collector &Coll);
+ bool PerformDefaultLowering(Function &F, GCStrategy &Coll);
static bool InsertRootInitializers(Function &F,
AllocaInst **Roots, unsigned Count);
/// 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
- /// CollectorMetadata record for each function.
- class VISIBILITY_HIDDEN MachineCodeAnalysis : public MachineFunctionPass {
+ /// GCMetadata record for each function.
+ class MachineCodeAnalysis : public MachineFunctionPass {
const TargetMachine *TM;
- CollectorMetadata *MD;
+ GCFunctionInfo *FI;
MachineModuleInfo *MMI;
const TargetInstrInfo *TII;
- MachineFrameInfo *MFI;
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);
// -----------------------------------------------------------------------------
-Collector::Collector() :
+GCStrategy::GCStrategy() :
NeededSafePoints(0),
CustomReadBarriers(false),
CustomWriteBarriers(false),
UsesMetadata(false)
{}
-Collector::~Collector() {
+GCStrategy::~GCStrategy() {
for (iterator I = begin(), E = end(); I != E; ++I)
delete *I;
Functions.clear();
}
-bool Collector::initializeCustomLowering(Module &M) { return false; }
+bool GCStrategy::initializeCustomLowering(Module &M) { return false; }
-bool Collector::performCustomLowering(Function &F) {
- cerr << "gc " << getName() << " must override performCustomLowering.\n";
- abort();
+bool GCStrategy::performCustomLowering(Function &F) {
+ dbgs() << "gc " << getName() << " must override performCustomLowering.\n";
+ llvm_unreachable(0);
return 0;
}
-
-CollectorMetadata *Collector::insertFunctionMetadata(const Function &F) {
- CollectorMetadata *CM = new CollectorMetadata(F, *this);
- Functions.push_back(CM);
- return CM;
-}
+
+GCFunctionInfo *GCStrategy::insertFunctionInfo(const Function &F) {
+ GCFunctionInfo *FI = new GCFunctionInfo(F, *this);
+ Functions.push_back(FI);
+ return 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((intptr_t)&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<CollectorModuleMetadata>();
+ AU.addRequired<GCModuleInfo>();
+ AU.addPreserved<DominatorTree>();
}
/// doInitialization - If this module uses the GC intrinsics, find them now.
// work against the entire module. But this cannot be done at
// runFunction time (initializeCustomLowering likely needs to change
// the module).
- CollectorModuleMetadata *CMM = getAnalysisToUpdate<CollectorModuleMetadata>();
- assert(CMM && "LowerIntrinsics didn't require CollectorModuleMetadata!?");
+ GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
+ assert(MI && "LowerIntrinsics didn't require GCModuleInfo!?");
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- if (!I->isDeclaration() && I->hasCollector())
- CMM->get(*I); // Instantiate the Collector.
+ if (!I->isDeclaration() && I->hasGC())
+ MI->getFunctionInfo(*I); // Instantiate the GC strategy.
bool MadeChange = false;
- for (CollectorModuleMetadata::iterator I = CMM->begin(),
- E = CMM->end(); I != E; ++I)
+ for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
if (NeedsCustomLoweringPass(**I))
if ((*I)->initializeCustomLowering(M))
MadeChange = true;
for (AllocaInst **I = Roots, **E = Roots + Count; I != E; ++I)
if (!InitedRoots.count(*I)) {
- new StoreInst(ConstantPointerNull::get(cast<PointerType>(
- cast<PointerType>((*I)->getType())->getElementType())),
- *I, IP);
+ StoreInst* SI = new StoreInst(ConstantPointerNull::get(cast<PointerType>(
+ cast<PointerType>((*I)->getType())->getElementType())),
+ *I);
+ SI->insertAfter(*I);
MadeChange = true;
}
return MadeChange;
}
-bool LowerIntrinsics::NeedsDefaultLoweringPass(const Collector &C) {
+bool LowerIntrinsics::NeedsDefaultLoweringPass(const GCStrategy &C) {
// Default lowering is necessary only if read or write barriers have a default
// action. The default for roots is no action.
return !C.customWriteBarrier()
|| C.initializeRoots();
}
-bool LowerIntrinsics::NeedsCustomLoweringPass(const Collector &C) {
+bool LowerIntrinsics::NeedsCustomLoweringPass(const GCStrategy &C) {
// Custom lowering is only necessary if enabled for some action.
return C.customWriteBarrier()
|| C.customReadBarrier()
/// Leave gcroot intrinsics; the code generator needs to see those.
bool LowerIntrinsics::runOnFunction(Function &F) {
// Quick exit for functions that do not use GC.
- if (!F.hasCollector()) return false;
+ if (!F.hasGC())
+ return false;
- CollectorMetadata &MD = getAnalysis<CollectorModuleMetadata>().get(F);
- Collector &Coll = MD.getCollector();
+ GCFunctionInfo &FI = getAnalysis<GCModuleInfo>().getFunctionInfo(F);
+ GCStrategy &S = FI.getStrategy();
bool MadeChange = false;
- if (NeedsDefaultLoweringPass(Coll))
- MadeChange |= PerformDefaultLowering(F, Coll);
-
- if (NeedsCustomLoweringPass(Coll))
- MadeChange |= Coll.performCustomLowering(F);
+ if (NeedsDefaultLoweringPass(S))
+ MadeChange |= PerformDefaultLowering(F, 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 LowerIntrinsics::PerformDefaultLowering(Function &F, Collector &Coll) {
- bool LowerWr = !Coll.customWriteBarrier();
- bool LowerRd = !Coll.customReadBarrier();
- bool InitRoots = Coll.initializeRoots();
+bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) {
+ bool LowerWr = !S.customWriteBarrier();
+ 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->getOperand(1), CI->getOperand(3), CI);
+ Value *St = new StoreInst(CI->getArgOperand(0),
+ CI->getArgOperand(2), CI);
CI->replaceAllUsesWith(St);
CI->eraseFromParent();
}
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();
// Initialize the GC root, but do not delete the intrinsic. The
// backend needs the intrinsic to flag the stack slot.
Roots.push_back(cast<AllocaInst>(
- CI->getOperand(1)->stripPointerCasts()));
+ CI->getArgOperand(0)->stripPointerCasts()));
}
break;
default:
char MachineCodeAnalysis::ID = 0;
MachineCodeAnalysis::MachineCodeAnalysis()
- : MachineFunctionPass(intptr_t(&ID)) {}
+ : MachineFunctionPass(ID) {}
const char *MachineCodeAnalysis::getPassName() const {
return "Analyze Machine Code For Garbage Collection";
MachineFunctionPass::getAnalysisUsage(AU);
AU.setPreservesAll();
AU.addRequired<MachineModuleInfo>();
- AU.addRequired<CollectorModuleMetadata>();
+ AU.addRequired<GCModuleInfo>();
}
-unsigned MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI) const {
- unsigned Label = MMI->NextLabelID();
- BuildMI(MBB, MI, 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;
}
MachineBasicBlock::iterator RAI = CI;
++RAI;
- if (MD->getCollector().needsSafePoint(GC::PreCall))
- MD->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 (MD->getCollector().needsSafePoint(GC::PostCall))
- MD->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) {
}
void MachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
- uint64_t StackSize = MFI->getStackSize();
- uint64_t OffsetAdjustment = MFI->getOffsetAdjustment();
- uint64_t OffsetOfLocalArea = TM->getFrameInfo()->getOffsetOfLocalArea();
+ const TargetFrameLowering *TFI = TM->getFrameLowering();
+ assert(TFI && "TargetRegisterInfo not available!");
- for (CollectorMetadata::roots_iterator RI = MD->roots_begin(),
- RE = MD->roots_end(); RI != RE; ++RI)
- RI->StackOffset = MFI->getObjectOffset(RI->Num) + StackSize
- - OffsetOfLocalArea + OffsetAdjustment;
+ for (GCFunctionInfo::roots_iterator RI = FI->roots_begin(),
+ RE = FI->roots_end(); RI != RE; ++RI)
+ RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num);
}
bool MachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
// Quick exit for functions that do not use GC.
- if (!MF.getFunction()->hasCollector()) return false;
+ if (!MF.getFunction()->hasGC())
+ return false;
- MD = &getAnalysis<CollectorModuleMetadata>().get(*MF.getFunction());
- if (!MD->getCollector().needsSafePoints())
+ FI = &getAnalysis<GCModuleInfo>().getFunctionInfo(*MF.getFunction());
+ if (!FI->getStrategy().needsSafePoints())
return false;
TM = &MF.getTarget();
MMI = &getAnalysis<MachineModuleInfo>();
TII = TM->getInstrInfo();
- MFI = MF.getFrameInfo();
// Find the size of the stack frame.
- MD->setFrameSize(MFI->getStackSize());
+ FI->setFrameSize(MF.getFrameInfo()->getStackSize());
// Find all safe points.
FindSafePoints(MF);
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