#include "ProfilingUtils.h"
#include "llvm/Transforms/Instrumentation.h"
-#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/DebugInfo.h"
+#include "llvm/IRBuilder.h"
+#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
-#include "llvm/Instructions.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/DebugLoc.h"
-#include "llvm/Support/InstIterator.h"
-#include "llvm/Support/IRBuilder.h"
-#include "llvm/Support/PathV2.h"
#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/UniqueVector.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/DebugLoc.h"
+#include "llvm/Support/InstIterator.h"
+#include "llvm/Support/PathV2.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/ModuleUtils.h"
#include <string>
#include <utility>
using namespace llvm;
virtual const char *getPassName() const {
return "GCOV Profiler";
}
-
private:
bool runOnModule(Module &M);
// Get pointers to the functions in the runtime library.
Constant *getStartFileFunc();
- void incrementIndirectCounter(IRBuilder<> &Builder, BasicBlock *Exit,
- GlobalVariable *EdgeState,
- Value *CounterPtrArray);
+ Constant *getIncrementIndirectCounterFunc();
Constant *getEmitFunctionFunc();
Constant *getEmitArcsFunc();
Constant *getEndFileFunc();
// Add the function to write out all our counters to the global destructor
// list.
- void insertCounterWriteout(SmallVector<std::pair<GlobalVariable *,
- MDNode *>, 8> &);
+ void insertCounterWriteout(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
+ void insertIndirectCounterIncrement();
+ void insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
- std::string mangleName(DICompileUnit CU, std::string NewStem);
+ std::string mangleName(DICompileUnit CU, const char *NewStem);
bool EmitNotes;
bool EmitData;
};
}
-std::string GCOVProfiler::mangleName(DICompileUnit CU, std::string NewStem) {
+std::string GCOVProfiler::mangleName(DICompileUnit CU, const char *NewStem) {
if (NamedMDNode *GCov = M->getNamedMetadata("llvm.gcov")) {
for (int i = 0, e = GCov->getNumOperands(); i != e; ++i) {
MDNode *N = GCov->getOperand(i);
if (!CU_Nodes) return false;
bool Result = false;
+ bool InsertIndCounterIncrCode = false;
for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
DICompileUnit CU(CU_Nodes->getOperand(i));
DIArray SPs = CU.getSubprograms();
new GlobalVariable(*M, CounterTy, false,
GlobalValue::InternalLinkage,
Constant::getNullValue(CounterTy),
- "__llvm_gcov_ctr", 0, false, 0);
+ "__llvm_gcov_ctr");
CountersBySP.push_back(std::make_pair(Counters, (MDNode*)SP));
UniqueVector<BasicBlock *> ComplexEdgePreds;
}
for (int i = 0, e = ComplexEdgeSuccs.size(); i != e; ++i) {
// call runtime to perform increment
- BasicBlock *BB = ComplexEdgeSuccs[i+1];
- BasicBlock::iterator InsertPt = BB->getFirstInsertionPt();
- BasicBlock *Split = BB->splitBasicBlock(InsertPt);
- InsertPt = BB->getFirstInsertionPt();
+ BasicBlock::iterator InsertPt =
+ ComplexEdgeSuccs[i+1]->getFirstInsertionPt();
IRBuilder<> Builder(InsertPt);
Value *CounterPtrArray =
Builder.CreateConstInBoundsGEP2_64(EdgeTable, 0,
i * ComplexEdgePreds.size());
// Build code to increment the counter.
- incrementIndirectCounter(Builder, Split, EdgeState, CounterPtrArray);
+ InsertIndCounterIncrCode = true;
+ Builder.CreateCall2(getIncrementIndirectCounterFunc(),
+ EdgeState, CounterPtrArray);
}
}
}
+
insertCounterWriteout(CountersBySP);
+ insertFlush(CountersBySP);
}
+
+ if (InsertIndCounterIncrCode)
+ insertIndirectCounterIncrement();
+
return Result;
}
// read it. Threads and invoke make this untrue.
// emit [(succs * preds) x i64*], logically [succ x [pred x i64*]].
+ size_t TableSize = Succs.size() * Preds.size();
Type *Int64PtrTy = Type::getInt64PtrTy(*Ctx);
- ArrayType *EdgeTableTy = ArrayType::get(
- Int64PtrTy, Succs.size() * Preds.size());
+ ArrayType *EdgeTableTy = ArrayType::get(Int64PtrTy, TableSize);
- Constant **EdgeTable = new Constant*[Succs.size() * Preds.size()];
+ OwningArrayPtr<Constant *> EdgeTable(new Constant*[TableSize]);
Constant *NullValue = Constant::getNullValue(Int64PtrTy);
- for (int i = 0, ie = Succs.size() * Preds.size(); i != ie; ++i)
+ for (size_t i = 0; i != TableSize; ++i)
EdgeTable[i] = NullValue;
unsigned Edge = 0;
Edge += Successors;
}
- ArrayRef<Constant*> V(&EdgeTable[0], Succs.size() * Preds.size());
+ ArrayRef<Constant*> V(&EdgeTable[0], TableSize);
GlobalVariable *EdgeTableGV =
new GlobalVariable(
*M, EdgeTableTy, true, GlobalValue::InternalLinkage,
return M->getOrInsertFunction("llvm_gcda_start_file", FTy);
}
-/// incrementIndirectCounter - Emit code that increments the indirect
-/// counter. The code is meant to copy the llvm_gcda_increment_indirect_counter
-/// function, but because it's inlined into the function, we don't have to worry
-/// about the runtime library possibly writing into a protected area.
-void GCOVProfiler::incrementIndirectCounter(IRBuilder<> &Builder,
- BasicBlock *Exit,
- GlobalVariable *EdgeState,
- Value *CounterPtrArray) {
+Constant *GCOVProfiler::getIncrementIndirectCounterFunc() {
+ Type *Int32Ty = Type::getInt32Ty(*Ctx);
Type *Int64Ty = Type::getInt64Ty(*Ctx);
- ConstantInt *NegOne = ConstantInt::get(Type::getInt32Ty(*Ctx), 0xffffffff);
-
- // Create exiting blocks.
- BasicBlock *InsBB = Builder.GetInsertBlock();
- Function *Fn = InsBB->getParent();
- BasicBlock *PredNotNegOne = BasicBlock::Create(*Ctx, "", Fn, Exit);
- BasicBlock *CounterEnd = BasicBlock::Create(*Ctx, "", Fn, Exit);
-
- // uint32_t pred = *EdgeState;
- // if (pred == 0xffffffff) return;
- Value *Pred = Builder.CreateLoad(EdgeState, "predecessor");
- Value *Cond = Builder.CreateICmpEQ(Pred, NegOne);
- InsBB->getTerminator()->eraseFromParent();
- BranchInst::Create(Exit, PredNotNegOne, Cond, InsBB);
-
- Builder.SetInsertPoint(PredNotNegOne);
-
- // uint64_t *counter = CounterPtrArray[pred];
- // if (!counter) return;
- Value *ZExtPred = Builder.CreateZExt(Pred, Int64Ty);
- Value *GEP = Builder.CreateGEP(CounterPtrArray, ZExtPred);
- Value *Counter = Builder.CreateLoad(GEP, "counter");
- Cond = Builder.CreateICmpEQ(Counter,
- Constant::getNullValue(Type::getInt64PtrTy(*Ctx, 0)));
- Builder.CreateCondBr(Cond, Exit, CounterEnd);
-
- Builder.SetInsertPoint(CounterEnd);
-
- // ++*counter;
- Value *Add = Builder.CreateAdd(Builder.CreateLoad(Counter),
- ConstantInt::get(Int64Ty, 1));
- Builder.CreateStore(Add, Counter);
- Builder.CreateBr(Exit);
-
- // Clear the predecessor number
- Builder.SetInsertPoint(Exit->getFirstInsertionPt());
- Builder.CreateStore(NegOne, EdgeState);
+ Type *Args[] = {
+ Int32Ty->getPointerTo(), // uint32_t *predecessor
+ Int64Ty->getPointerTo()->getPointerTo() // uint64_t **counters
+ };
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
+ return M->getOrInsertFunction("__llvm_gcov_indirect_counter_increment", FTy);
}
Constant *GCOVProfiler::getEmitFunctionFunc() {
}
void GCOVProfiler::insertCounterWriteout(
- SmallVector<std::pair<GlobalVariable *, MDNode *>, 8> &CountersBySP) {
- FunctionType *WriteoutFTy =
- FunctionType::get(Type::getVoidTy(*Ctx), false);
- Function *WriteoutF = Function::Create(WriteoutFTy,
- GlobalValue::InternalLinkage,
- "__llvm_gcov_writeout", M);
+ ArrayRef<std::pair<GlobalVariable *, MDNode *> > CountersBySP) {
+ FunctionType *WriteoutFTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ Function *WriteoutF = M->getFunction("__llvm_gcov_writeout");
+ if (!WriteoutF)
+ WriteoutF = Function::Create(WriteoutFTy, GlobalValue::InternalLinkage,
+ "__llvm_gcov_writeout", M);
WriteoutF->setUnnamedAddr(true);
- BasicBlock *BB = BasicBlock::Create(*Ctx, "", WriteoutF);
+
+ BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", WriteoutF);
IRBuilder<> Builder(BB);
Constant *StartFile = getStartFileFunc();
NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
if (CU_Nodes) {
for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
- DICompileUnit compile_unit(CU_Nodes->getOperand(i));
- std::string FilenameGcda = mangleName(compile_unit, "gcda");
+ DICompileUnit CU(CU_Nodes->getOperand(i));
+ std::string FilenameGcda = mangleName(CU, "gcda");
Builder.CreateCall(StartFile,
Builder.CreateGlobalStringPtr(FilenameGcda));
- for (SmallVector<std::pair<GlobalVariable *, MDNode *>, 8>::iterator
+ for (ArrayRef<std::pair<GlobalVariable *, MDNode *> >::iterator
I = CountersBySP.begin(), E = CountersBySP.end();
I != E; ++I) {
DISubprogram SP(I->second);
}
Builder.CreateRetVoid();
- InsertProfilingShutdownCall(WriteoutF, M);
+ // Create a small bit of code that registers the "__llvm_gcov_writeout"
+ // function to be executed at exit.
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ Function *F = Function::Create(FTy, GlobalValue::InternalLinkage,
+ "__llvm_gcov_init", M);
+ F->setUnnamedAddr(true);
+ F->setLinkage(GlobalValue::InternalLinkage);
+ F->addFnAttr(Attributes::NoInline);
+
+ BB = BasicBlock::Create(*Ctx, "entry", F);
+ Builder.SetInsertPoint(BB);
+
+ FTy = FunctionType::get(Type::getInt32Ty(*Ctx),
+ PointerType::get(FTy, 0), false);
+ Constant *AtExitFn = M->getOrInsertFunction("atexit", FTy);
+ Builder.CreateCall(AtExitFn, WriteoutF);
+ Builder.CreateRetVoid();
+
+ appendToGlobalCtors(*M, F, 0);
+}
+
+void GCOVProfiler::insertIndirectCounterIncrement() {
+ Function *Fn =
+ cast<Function>(GCOVProfiler::getIncrementIndirectCounterFunc());
+ Fn->setUnnamedAddr(true);
+ Fn->setLinkage(GlobalValue::InternalLinkage);
+ Fn->addFnAttr(Attributes::NoInline);
+
+ Type *Int32Ty = Type::getInt32Ty(*Ctx);
+ Type *Int64Ty = Type::getInt64Ty(*Ctx);
+ Constant *NegOne = ConstantInt::get(Int32Ty, 0xffffffff);
+
+ // Create basic blocks for function.
+ BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", Fn);
+ IRBuilder<> Builder(BB);
+
+ BasicBlock *PredNotNegOne = BasicBlock::Create(*Ctx, "", Fn);
+ BasicBlock *CounterEnd = BasicBlock::Create(*Ctx, "", Fn);
+ BasicBlock *Exit = BasicBlock::Create(*Ctx, "exit", Fn);
+
+ // uint32_t pred = *predecessor;
+ // if (pred == 0xffffffff) return;
+ Argument *Arg = Fn->arg_begin();
+ Arg->setName("predecessor");
+ Value *Pred = Builder.CreateLoad(Arg, "pred");
+ Value *Cond = Builder.CreateICmpEQ(Pred, NegOne);
+ BranchInst::Create(Exit, PredNotNegOne, Cond, BB);
+
+ Builder.SetInsertPoint(PredNotNegOne);
+
+ // uint64_t *counter = counters[pred];
+ // if (!counter) return;
+ Value *ZExtPred = Builder.CreateZExt(Pred, Int64Ty);
+ Arg = llvm::next(Fn->arg_begin());
+ Arg->setName("counters");
+ Value *GEP = Builder.CreateGEP(Arg, ZExtPred);
+ Value *Counter = Builder.CreateLoad(GEP, "counter");
+ Cond = Builder.CreateICmpEQ(Counter,
+ Constant::getNullValue(Int64Ty->getPointerTo()));
+ Builder.CreateCondBr(Cond, Exit, CounterEnd);
+
+ // ++*counter;
+ Builder.SetInsertPoint(CounterEnd);
+ Value *Add = Builder.CreateAdd(Builder.CreateLoad(Counter),
+ ConstantInt::get(Int64Ty, 1));
+ Builder.CreateStore(Add, Counter);
+ Builder.CreateBr(Exit);
+
+ // Fill in the exit block.
+ Builder.SetInsertPoint(Exit);
+ Builder.CreateRetVoid();
+}
+
+void GCOVProfiler::
+insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> > CountersBySP) {
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ Function *FlushF = M->getFunction("__gcov_flush");
+ if (!FlushF)
+ FlushF = Function::Create(FTy, GlobalValue::InternalLinkage,
+ "__gcov_flush", M);
+ else
+ FlushF->setLinkage(GlobalValue::InternalLinkage);
+ FlushF->setUnnamedAddr(true);
+
+ BasicBlock *Entry = BasicBlock::Create(*Ctx, "entry", FlushF);
+
+ // Write out the current counters.
+ Constant *WriteoutF = M->getFunction("__llvm_gcov_writeout");
+ assert(WriteoutF && "Need to create the writeout function first!");
+
+ IRBuilder<> Builder(Entry);
+ Builder.CreateCall(WriteoutF);
+
+ // Zero out the counters.
+ for (ArrayRef<std::pair<GlobalVariable *, MDNode *> >::iterator
+ I = CountersBySP.begin(), E = CountersBySP.end();
+ I != E; ++I) {
+ GlobalVariable *GV = I->first;
+ Constant *Null = Constant::getNullValue(GV->getType()->getElementType());
+ Builder.CreateStore(Null, GV);
+ }
+
+ Type *RetTy = FlushF->getReturnType();
+ if (RetTy == Type::getVoidTy(*Ctx))
+ Builder.CreateRetVoid();
+ else if (RetTy->isIntegerTy())
+ // Used if __gcov_flush was implicitly declared.
+ Builder.CreateRet(ConstantInt::get(RetTy, 0));
+ else
+ report_fatal_error("invalid return type for __gcov_flush");
}
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