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clang-format GCStrategy.cpp & GCRootLowering.cpp (NFC)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Philip Reames 2015-01-15 19:39:17 +00:00
parent 71649b0d0d
commit b0a04acdc0
2 changed files with 75 additions and 89 deletions
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150
lib/CodeGen/GCRootLowering.cpp
View File

@ -33,76 +33,70 @@ 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
/// directed by the GCStrategy. It also performs automatic root initialization
/// and custom intrinsic lowering.
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, GCStrategy &Coll);
static bool InsertRootInitializers(Function &F,
AllocaInst **Roots, unsigned Count);
/// LowerIntrinsics - This pass rewrites calls to the llvm.gcread or
/// 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 {
static bool NeedsDefaultLoweringPass(const GCStrategy &C);
static bool NeedsCustomLoweringPass(const GCStrategy &C);
static bool CouldBecomeSafePoint(Instruction *I);
bool PerformDefaultLowering(Function &F, GCStrategy &Coll);
static bool InsertRootInitializers(Function &F, AllocaInst **Roots,
unsigned Count);
public:
static char ID;
public:
static char ID;
LowerIntrinsics();
const char *getPassName() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
LowerIntrinsics();
const char *getPassName() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool doInitialization(Module &M) override;
bool runOnFunction(Function &F) override;
};
bool doInitialization(Module &M) override;
bool runOnFunction(Function &F) override;
};
/// 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 GCMachineCodeAnalysis : public MachineFunctionPass {
const TargetMachine *TM;
GCFunctionInfo *FI;
MachineModuleInfo *MMI;
const TargetInstrInfo *TII;
/// 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 GCMachineCodeAnalysis : public MachineFunctionPass {
const TargetMachine *TM;
GCFunctionInfo *FI;
MachineModuleInfo *MMI;
const TargetInstrInfo *TII;
void FindSafePoints(MachineFunction &MF);
void VisitCallPoint(MachineBasicBlock::iterator MI);
MCSymbol *InsertLabel(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
DebugLoc DL) const;
void FindSafePoints(MachineFunction &MF);
void VisitCallPoint(MachineBasicBlock::iterator MI);
MCSymbol *InsertLabel(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
DebugLoc DL) const;
void FindStackOffsets(MachineFunction &MF);
void FindStackOffsets(MachineFunction &MF);
public:
static char ID;
public:
static char ID;
GCMachineCodeAnalysis();
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnMachineFunction(MachineFunction &MF) override;
};
GCMachineCodeAnalysis();
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnMachineFunction(MachineFunction &MF) override;
};
}
// -----------------------------------------------------------------------------
INITIALIZE_PASS_BEGIN(LowerIntrinsics, "gc-lowering", "GC Lowering",
false, false)
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();
}
FunctionPass *llvm::createGCLoweringPass() { return new LowerIntrinsics(); }
char LowerIntrinsics::ID = 0;
LowerIntrinsics::LowerIntrinsics()
: FunctionPass(ID) {
initializeLowerIntrinsicsPass(*PassRegistry::getPassRegistry());
}
LowerIntrinsics::LowerIntrinsics() : FunctionPass(ID) {
initializeLowerIntrinsicsPass(*PassRegistry::getPassRegistry());
}
const char *LowerIntrinsics::getPassName() const {
return "Lower Garbage Collection Instructions";
@ -136,17 +130,18 @@ bool LowerIntrinsics::doInitialization(Module &M) {
}
bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
unsigned Count) {
unsigned Count) {
// Scroll past alloca instructions.
BasicBlock::iterator IP = F.getEntryBlock().begin();
while (isa<AllocaInst>(IP)) ++IP;
while (isa<AllocaInst>(IP))
++IP;
// Search for initializers in the initial BB.
SmallPtrSet<AllocaInst*,16> InitedRoots;
SmallPtrSet<AllocaInst *, 16> InitedRoots;
for (; !CouldBecomeSafePoint(IP); ++IP)
if (StoreInst *SI = dyn_cast<StoreInst>(IP))
if (AllocaInst *AI =
dyn_cast<AllocaInst>(SI->getOperand(1)->stripPointerCasts()))
dyn_cast<AllocaInst>(SI->getOperand(1)->stripPointerCasts()))
InitedRoots.insert(AI);
// Add root initializers.
@ -154,9 +149,10 @@ bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
for (AllocaInst **I = Roots, **E = Roots + Count; I != E; ++I)
if (!InitedRoots.count(*I)) {
StoreInst* SI = new StoreInst(ConstantPointerNull::get(cast<PointerType>(
cast<PointerType>((*I)->getType())->getElementType())),
*I);
StoreInst *SI = new StoreInst(
ConstantPointerNull::get(cast<PointerType>(
cast<PointerType>((*I)->getType())->getElementType())),
*I);
SI->insertAfter(*I);
MadeChange = true;
}
@ -167,16 +163,13 @@ bool LowerIntrinsics::InsertRootInitializers(Function &F, AllocaInst **Roots,
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.customReadBarrier()
|| C.initializeRoots();
return !C.customWriteBarrier() || !C.customReadBarrier() ||
C.initializeRoots();
}
bool LowerIntrinsics::NeedsCustomLoweringPass(const GCStrategy &C) {
// Custom lowering is only necessary if enabled for some action.
return C.customWriteBarrier()
|| C.customReadBarrier()
|| C.customRoots();
return C.customWriteBarrier() || C.customReadBarrier() || C.customRoots();
}
/// CouldBecomeSafePoint - Predicate to conservatively determine whether the
@ -193,8 +186,8 @@ bool LowerIntrinsics::CouldBecomeSafePoint(Instruction *I) {
// 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))
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.
@ -241,7 +234,7 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) {
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) {
@ -252,8 +245,8 @@ 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->getArgOperand(0),
CI->getArgOperand(2), CI);
Value *St =
new StoreInst(CI->getArgOperand(0), CI->getArgOperand(2), CI);
CI->replaceAllUsesWith(St);
CI->eraseFromParent();
}
@ -271,8 +264,8 @@ bool LowerIntrinsics::PerformDefaultLowering(Function &F, GCStrategy &S) {
if (InitRoots) {
// 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->getArgOperand(0)->stripPointerCasts()));
Roots.push_back(
cast<AllocaInst>(CI->getArgOperand(0)->stripPointerCasts()));
}
break;
default:
@ -298,8 +291,7 @@ char &llvm::GCMachineCodeAnalysisID = GCMachineCodeAnalysis::ID;
INITIALIZE_PASS(GCMachineCodeAnalysis, "gc-analysis",
"Analyze Machine Code For Garbage Collection", false, false)
GCMachineCodeAnalysis::GCMachineCodeAnalysis()
: MachineFunctionPass(ID) {}
GCMachineCodeAnalysis::GCMachineCodeAnalysis() : MachineFunctionPass(ID) {}
void GCMachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
MachineFunctionPass::getAnalysisUsage(AU);
@ -323,21 +315,21 @@ void GCMachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
++RAI;
if (FI->getStrategy().needsSafePoint(GC::PreCall)) {
MCSymbol* Label = InsertLabel(*CI->getParent(), CI, CI->getDebugLoc());
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());
MCSymbol *Label = InsertLabel(*CI->getParent(), RAI, CI->getDebugLoc());
FI->addSafePoint(GC::PostCall, Label, CI->getDebugLoc());
}
}
void GCMachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {
for (MachineFunction::iterator BBI = MF.begin(),
BBE = MF.end(); BBI != BBE; ++BBI)
for (MachineBasicBlock::iterator MI = BBI->begin(),
ME = BBI->end(); MI != ME; ++MI)
for (MachineFunction::iterator BBI = MF.begin(), BBE = MF.end(); BBI != BBE;
++BBI)
for (MachineBasicBlock::iterator MI = BBI->begin(), ME = BBI->end();
MI != ME; ++MI)
if (MI->isCall())
VisitCallPoint(MI);
}

14
lib/CodeGen/GCStrategy.cpp
View File

@ -16,13 +16,7 @@
using namespace llvm;
GCStrategy::GCStrategy() :
UseStatepoints(false),
NeededSafePoints(0),
CustomReadBarriers(false),
CustomWriteBarriers(false),
CustomRoots(false),
CustomSafePoints(false),
InitRoots(true),
UsesMetadata(false)
{}
GCStrategy::GCStrategy()
: UseStatepoints(false), NeededSafePoints(0), CustomReadBarriers(false),
CustomWriteBarriers(false), CustomRoots(false), CustomSafePoints(false),
InitRoots(true), UsesMetadata(false) {}