// 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.
+// GCMachineCodeAnalysis 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/CodeGen/Passes.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
static char ID;
LowerIntrinsics();
- const char *getPassName() const;
- void getAnalysisUsage(AnalysisUsage &AU) const;
+ const char *getPassName() const override;
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
- bool doInitialization(Module &M);
- bool runOnFunction(Function &F);
+ bool doInitialization(Module &M) override;
+ bool runOnFunction(Function &F) override;
};
- /// MachineCodeAnalysis - This is a target-independent pass over the machine
+ /// GCMachineCodeAnalysis - 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.
- class MachineCodeAnalysis : public MachineFunctionPass {
+ class GCMachineCodeAnalysis : public MachineFunctionPass {
const TargetMachine *TM;
GCFunctionInfo *FI;
MachineModuleInfo *MMI;
public:
static char ID;
- MachineCodeAnalysis();
- const char *getPassName() const;
- void getAnalysisUsage(AnalysisUsage &AU) const;
+ GCMachineCodeAnalysis();
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
- bool runOnMachineFunction(MachineFunction &MF);
+ bool runOnMachineFunction(MachineFunction &MF) override;
};
}
UsesMetadata(false)
{}
-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);
-}
-
-
-bool GCStrategy::findCustomSafePoints(GCFunctionInfo& FI, MachineFunction &F) {
- dbgs() << "gc " << getName() << " must override findCustomSafePoints.\n";
- llvm_unreachable(0);
-}
-
-
-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",
void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const {
FunctionPass::getAnalysisUsage(AU);
AU.addRequired<GCModuleInfo>();
- AU.addPreserved<DominatorTree>();
+ AU.addPreserved<DominatorTreeWrapperPass>();
}
/// doInitialization - If this module uses the GC intrinsics, find them now.
// Custom lowering may modify the CFG, so dominators must be recomputed.
if (UseCustomLoweringPass) {
- if (DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>())
- DT->DT->recalculate(F);
+ if (DominatorTreeWrapperPass *DTWP =
+ getAnalysisIfAvailable<DominatorTreeWrapperPass>())
+ DTWP->getDomTree().recalculate(F);
}
return MadeChange;
// -----------------------------------------------------------------------------
-FunctionPass *llvm::createGCMachineCodeAnalysisPass() {
- return new MachineCodeAnalysis();
-}
+char GCMachineCodeAnalysis::ID = 0;
+char &llvm::GCMachineCodeAnalysisID = GCMachineCodeAnalysis::ID;
-char MachineCodeAnalysis::ID = 0;
+INITIALIZE_PASS(GCMachineCodeAnalysis, "gc-analysis",
+ "Analyze Machine Code For Garbage Collection", false, false)
-MachineCodeAnalysis::MachineCodeAnalysis()
+GCMachineCodeAnalysis::GCMachineCodeAnalysis()
: MachineFunctionPass(ID) {}
-const char *MachineCodeAnalysis::getPassName() const {
- return "Analyze Machine Code For Garbage Collection";
-}
-
-void MachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
+void GCMachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
MachineFunctionPass::getAnalysisUsage(AU);
AU.setPreservesAll();
AU.addRequired<MachineModuleInfo>();
AU.addRequired<GCModuleInfo>();
}
-MCSymbol *MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- DebugLoc DL) const {
+MCSymbol *GCMachineCodeAnalysis::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;
}
-void MachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
+void GCMachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
// Find the return address (next instruction), too, so as to bracket the call
// instruction.
MachineBasicBlock::iterator RAI = CI;
}
}
-void MachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {
+void GCMachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {
for (MachineFunction::iterator BBI = MF.begin(),
BBE = MF.end(); BBI != BBE; ++BBI)
for (MachineBasicBlock::iterator MI = BBI->begin(),
VisitCallPoint(MI);
}
-void MachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
- const TargetFrameLowering *TFI = TM->getFrameLowering();
+void GCMachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
+ const TargetFrameLowering *TFI = TM->getSubtargetImpl()->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);
+ for (GCFunctionInfo::roots_iterator RI = FI->roots_begin();
+ RI != FI->roots_end();) {
+ // If the root references a dead object, no need to keep it.
+ if (MF.getFrameInfo()->isDeadObjectIndex(RI->Num)) {
+ RI = FI->removeStackRoot(RI);
+ } else {
+ RI->StackOffset = TFI->getFrameIndexOffset(MF, RI->Num);
+ ++RI;
+ }
+ }
}
-bool MachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
+bool GCMachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
// Quick exit for functions that do not use GC.
if (!MF.getFunction()->hasGC())
return false;
TM = &MF.getTarget();
MMI = &getAnalysis<MachineModuleInfo>();
- TII = TM->getInstrInfo();
+ TII = TM->getSubtargetImpl()->getInstrInfo();
// Find the size of the stack frame.
FI->setFrameSize(MF.getFrameInfo()->getStackSize());
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