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-rw-r--r--lib/Transforms/Instrumentation/GCOVProfiling.cpp260
1 files changed, 150 insertions, 110 deletions
diff --git a/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index eb0dc1e..e8d4ac8 100644
--- a/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -29,6 +29,7 @@
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DebugLoc.h"
#include "llvm/Support/InstIterator.h"
@@ -39,31 +40,57 @@
#include <utility>
using namespace llvm;
+static cl::opt<std::string>
+DefaultGCOVVersion("default-gcov-version", cl::init("402*"), cl::Hidden,
+ cl::ValueRequired);
+
+GCOVOptions GCOVOptions::getDefault() {
+ GCOVOptions Options;
+ Options.EmitNotes = true;
+ Options.EmitData = true;
+ Options.UseCfgChecksum = false;
+ Options.NoRedZone = false;
+ Options.FunctionNamesInData = true;
+
+ if (DefaultGCOVVersion.size() != 4) {
+ llvm::report_fatal_error(std::string("Invalid -default-gcov-version: ") +
+ DefaultGCOVVersion);
+ }
+ memcpy(Options.Version, DefaultGCOVVersion.c_str(), 4);
+ return Options;
+}
+
namespace {
class GCOVProfiler : public ModulePass {
public:
static char ID;
- GCOVProfiler()
- : ModulePass(ID), EmitNotes(true), EmitData(true), Use402Format(false),
- UseExtraChecksum(false), NoRedZone(false) {
+ GCOVProfiler() : ModulePass(ID), Options(GCOVOptions::getDefault()) {
+ ReversedVersion[0] = Options.Version[3];
+ ReversedVersion[1] = Options.Version[2];
+ ReversedVersion[2] = Options.Version[1];
+ ReversedVersion[3] = Options.Version[0];
+ ReversedVersion[4] = '\0';
initializeGCOVProfilerPass(*PassRegistry::getPassRegistry());
}
- GCOVProfiler(bool EmitNotes, bool EmitData, bool use402Format,
- bool useExtraChecksum, bool NoRedZone_)
- : ModulePass(ID), EmitNotes(EmitNotes), EmitData(EmitData),
- Use402Format(use402Format), UseExtraChecksum(useExtraChecksum),
- NoRedZone(NoRedZone_) {
- assert((EmitNotes || EmitData) && "GCOVProfiler asked to do nothing?");
+ GCOVProfiler(const GCOVOptions &Options) : ModulePass(ID), Options(Options){
+ assert((Options.EmitNotes || Options.EmitData) &&
+ "GCOVProfiler asked to do nothing?");
+ ReversedVersion[0] = Options.Version[3];
+ ReversedVersion[1] = Options.Version[2];
+ ReversedVersion[2] = Options.Version[1];
+ ReversedVersion[3] = Options.Version[0];
+ ReversedVersion[4] = '\0';
initializeGCOVProfilerPass(*PassRegistry::getPassRegistry());
}
virtual const char *getPassName() const {
return "GCOV Profiler";
}
+
private:
bool runOnModule(Module &M);
- // Create the GCNO files for the Module based on DebugInfo.
- void emitGCNO();
+ // Create the .gcno files for the Module based on DebugInfo.
+ void emitProfileNotes();
// Modify the program to track transitions along edges and call into the
// profiling runtime to emit .gcda files when run.
@@ -74,6 +101,7 @@ namespace {
Constant *getIncrementIndirectCounterFunc();
Constant *getEmitFunctionFunc();
Constant *getEmitArcsFunc();
+ Constant *getDeleteFlushFunctionListFunc();
Constant *getEndFileFunc();
// Create or retrieve an i32 state value that is used to represent the
@@ -84,22 +112,22 @@ namespace {
// block number.
GlobalVariable *buildEdgeLookupTable(Function *F,
GlobalVariable *Counter,
- const UniqueVector<BasicBlock *> &Preds,
- const UniqueVector<BasicBlock *> &Succs);
+ const UniqueVector<BasicBlock *>&Preds,
+ const UniqueVector<BasicBlock*>&Succs);
// Add the function to write out all our counters to the global destructor
// list.
- void insertCounterWriteout(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
+ Function *insertCounterWriteout(ArrayRef<std::pair<GlobalVariable*,
+ MDNode*> >);
+ Function *insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
void insertIndirectCounterIncrement();
- void insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
std::string mangleName(DICompileUnit CU, const char *NewStem);
- bool EmitNotes;
- bool EmitData;
- bool Use402Format;
- bool UseExtraChecksum;
- bool NoRedZone;
+ GCOVOptions Options;
+
+ // Reversed, NUL-terminated copy of Options.Version.
+ char ReversedVersion[5];
Module *M;
LLVMContext *Ctx;
@@ -110,12 +138,8 @@ char GCOVProfiler::ID = 0;
INITIALIZE_PASS(GCOVProfiler, "insert-gcov-profiling",
"Insert instrumentation for GCOV profiling", false, false)
-ModulePass *llvm::createGCOVProfilerPass(bool EmitNotes, bool EmitData,
- bool Use402Format,
- bool UseExtraChecksum,
- bool NoRedZone) {
- return new GCOVProfiler(EmitNotes, EmitData, Use402Format, UseExtraChecksum,
- NoRedZone);
+ModulePass *llvm::createGCOVProfilerPass(const GCOVOptions &Options) {
+ return new GCOVProfiler(Options);
}
namespace {
@@ -253,8 +277,8 @@ namespace {
// object users can construct, the blocks and lines will be rooted here.
class GCOVFunction : public GCOVRecord {
public:
- GCOVFunction(DISubprogram SP, raw_ostream *os,
- bool Use402Format, bool UseExtraChecksum) {
+ GCOVFunction(DISubprogram SP, raw_ostream *os, uint32_t Ident,
+ bool UseCfgChecksum) {
this->os = os;
Function *F = SP.getFunction();
@@ -268,13 +292,12 @@ namespace {
writeBytes(FunctionTag, 4);
uint32_t BlockLen = 1 + 1 + 1 + lengthOfGCOVString(SP.getName()) +
1 + lengthOfGCOVString(SP.getFilename()) + 1;
- if (UseExtraChecksum)
+ if (UseCfgChecksum)
++BlockLen;
write(BlockLen);
- uint32_t Ident = reinterpret_cast<intptr_t>((MDNode*)SP);
write(Ident);
write(0); // lineno checksum
- if (UseExtraChecksum)
+ if (UseCfgChecksum)
write(0); // cfg checksum
writeGCOVString(SP.getName());
writeGCOVString(SP.getFilename());
@@ -358,12 +381,12 @@ bool GCOVProfiler::runOnModule(Module &M) {
this->M = &M;
Ctx = &M.getContext();
- if (EmitNotes) emitGCNO();
- if (EmitData) return emitProfileArcs();
+ if (Options.EmitNotes) emitProfileNotes();
+ if (Options.EmitData) return emitProfileArcs();
return false;
}
-void GCOVProfiler::emitGCNO() {
+void GCOVProfiler::emitProfileNotes() {
NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
if (!CU_Nodes) return;
@@ -376,10 +399,9 @@ void GCOVProfiler::emitGCNO() {
std::string ErrorInfo;
raw_fd_ostream out(mangleName(CU, "gcno").c_str(), ErrorInfo,
raw_fd_ostream::F_Binary);
- if (!Use402Format)
- out.write("oncg*404MVLL", 12);
- else
- out.write("oncg*204MVLL", 12);
+ out.write("oncg", 4);
+ out.write(ReversedVersion, 4);
+ out.write("MVLL", 4);
DIArray SPs = CU.getSubprograms();
for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
@@ -388,7 +410,7 @@ void GCOVProfiler::emitGCNO() {
Function *F = SP.getFunction();
if (!F) continue;
- GCOVFunction Func(SP, &out, Use402Format, UseExtraChecksum);
+ GCOVFunction Func(SP, &out, i, Options.UseCfgChecksum);
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
GCOVBlock &Block = Func.getBlock(BB);
@@ -469,21 +491,18 @@ bool GCOVProfiler::emitProfileArcs() {
Value *Counter = Builder.CreateConstInBoundsGEP2_64(Counters, 0,
Edge);
Value *Count = Builder.CreateLoad(Counter);
- Count = Builder.CreateAdd(Count,
- ConstantInt::get(Type::getInt64Ty(*Ctx),1));
+ Count = Builder.CreateAdd(Count, Builder.getInt64(1));
Builder.CreateStore(Count, Counter);
} else if (BranchInst *BI = dyn_cast<BranchInst>(TI)) {
- Value *Sel = Builder.CreateSelect(
- BI->getCondition(),
- ConstantInt::get(Type::getInt64Ty(*Ctx), Edge),
- ConstantInt::get(Type::getInt64Ty(*Ctx), Edge + 1));
+ Value *Sel = Builder.CreateSelect(BI->getCondition(),
+ Builder.getInt64(Edge),
+ Builder.getInt64(Edge + 1));
SmallVector<Value *, 2> Idx;
- Idx.push_back(Constant::getNullValue(Type::getInt64Ty(*Ctx)));
+ Idx.push_back(Builder.getInt64(0));
Idx.push_back(Sel);
Value *Counter = Builder.CreateInBoundsGEP(Counters, Idx);
Value *Count = Builder.CreateLoad(Counter);
- Count = Builder.CreateAdd(Count,
- ConstantInt::get(Type::getInt64Ty(*Ctx),1));
+ Count = Builder.CreateAdd(Count, Builder.getInt64(1));
Builder.CreateStore(Count, Counter);
} else {
ComplexEdgePreds.insert(BB);
@@ -500,10 +519,9 @@ bool GCOVProfiler::emitProfileArcs() {
ComplexEdgePreds, ComplexEdgeSuccs);
GlobalVariable *EdgeState = getEdgeStateValue();
- Type *Int32Ty = Type::getInt32Ty(*Ctx);
for (int i = 0, e = ComplexEdgePreds.size(); i != e; ++i) {
IRBuilder<> Builder(ComplexEdgePreds[i+1]->getTerminator());
- Builder.CreateStore(ConstantInt::get(Int32Ty, i), EdgeState);
+ Builder.CreateStore(Builder.getInt32(i), EdgeState);
}
for (int i = 0, e = ComplexEdgeSuccs.size(); i != e; ++i) {
// call runtime to perform increment
@@ -522,8 +540,42 @@ bool GCOVProfiler::emitProfileArcs() {
}
}
- insertCounterWriteout(CountersBySP);
- insertFlush(CountersBySP);
+ Function *WriteoutF = insertCounterWriteout(CountersBySP);
+ Function *FlushF = insertFlush(CountersBySP);
+
+ // Create a small bit of code that registers the "__llvm_gcov_writeout" to
+ // be executed at exit and the "__llvm_gcov_flush" function to be executed
+ // when "__gcov_flush" is called.
+ 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(Attribute::NoInline);
+ if (Options.NoRedZone)
+ F->addFnAttr(Attribute::NoRedZone);
+
+ BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", F);
+ IRBuilder<> Builder(BB);
+
+ FTy = FunctionType::get(Builder.getInt32Ty(),
+ PointerType::get(FTy, 0), false);
+ Constant *AtExitFn = M->getOrInsertFunction("atexit", FTy);
+ Builder.CreateCall(AtExitFn, WriteoutF);
+
+ // Register the local flush function.
+ FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ FTy = FunctionType::get(Builder.getVoidTy(),
+ PointerType::get(FTy, 0), false);
+ Constant *RegFlush =
+ M->getOrInsertFunction("llvm_register_flush_function", FTy);
+ Builder.CreateCall(RegFlush, FlushF);
+
+ // Make sure that all the flush function list is deleted.
+ Builder.CreateCall(AtExitFn, getDeleteFlushFunctionListFunc());
+ Builder.CreateRetVoid();
+
+ appendToGlobalCtors(*M, F, 0);
}
if (InsertIndCounterIncrCode)
@@ -560,8 +612,8 @@ GlobalVariable *GCOVProfiler::buildEdgeLookupTable(
if (Successors > 1 && !isa<BranchInst>(TI) && !isa<ReturnInst>(TI)) {
for (int i = 0; i != Successors; ++i) {
BasicBlock *Succ = TI->getSuccessor(i);
- IRBuilder<> builder(Succ);
- Value *Counter = builder.CreateConstInBoundsGEP2_64(Counters, 0,
+ IRBuilder<> Builder(Succ);
+ Value *Counter = Builder.CreateConstInBoundsGEP2_64(Counters, 0,
Edge + i);
EdgeTable[((Succs.idFor(Succ)-1) * Preds.size()) +
(Preds.idFor(BB)-1)] = cast<Constant>(Counter);
@@ -581,8 +633,11 @@ GlobalVariable *GCOVProfiler::buildEdgeLookupTable(
}
Constant *GCOVProfiler::getStartFileFunc() {
- FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
- Type::getInt8PtrTy(*Ctx), false);
+ Type *Args[] = {
+ Type::getInt8PtrTy(*Ctx), // const char *orig_filename
+ Type::getInt8PtrTy(*Ctx), // const char version[4]
+ };
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
return M->getOrInsertFunction("llvm_gcda_start_file", FTy);
}
@@ -598,9 +653,10 @@ Constant *GCOVProfiler::getIncrementIndirectCounterFunc() {
}
Constant *GCOVProfiler::getEmitFunctionFunc() {
- Type *Args[2] = {
+ Type *Args[3] = {
Type::getInt32Ty(*Ctx), // uint32_t ident
Type::getInt8PtrTy(*Ctx), // const char *function_name
+ Type::getInt8Ty(*Ctx), // uint8_t use_extra_checksum
};
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
return M->getOrInsertFunction("llvm_gcda_emit_function", FTy);
@@ -611,11 +667,15 @@ Constant *GCOVProfiler::getEmitArcsFunc() {
Type::getInt32Ty(*Ctx), // uint32_t num_counters
Type::getInt64PtrTy(*Ctx), // uint64_t *counters
};
- FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
- Args, false);
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
return M->getOrInsertFunction("llvm_gcda_emit_arcs", FTy);
}
+Constant *GCOVProfiler::getDeleteFlushFunctionListFunc() {
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ return M->getOrInsertFunction("llvm_delete_flush_function_list", FTy);
+}
+
Constant *GCOVProfiler::getEndFileFunc() {
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
return M->getOrInsertFunction("llvm_gcda_end_file", FTy);
@@ -634,7 +694,7 @@ GlobalVariable *GCOVProfiler::getEdgeStateValue() {
return GV;
}
-void GCOVProfiler::insertCounterWriteout(
+Function *GCOVProfiler::insertCounterWriteout(
ArrayRef<std::pair<GlobalVariable *, MDNode *> > CountersBySP) {
FunctionType *WriteoutFTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
Function *WriteoutF = M->getFunction("__llvm_gcov_writeout");
@@ -643,7 +703,7 @@ void GCOVProfiler::insertCounterWriteout(
"__llvm_gcov_writeout", M);
WriteoutF->setUnnamedAddr(true);
WriteoutF->addFnAttr(Attribute::NoInline);
- if (NoRedZone)
+ if (Options.NoRedZone)
WriteoutF->addFnAttr(Attribute::NoRedZone);
BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", WriteoutF);
@@ -659,50 +719,31 @@ void GCOVProfiler::insertCounterWriteout(
for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
DICompileUnit CU(CU_Nodes->getOperand(i));
std::string FilenameGcda = mangleName(CU, "gcda");
- Builder.CreateCall(StartFile,
- Builder.CreateGlobalStringPtr(FilenameGcda));
- for (ArrayRef<std::pair<GlobalVariable *, MDNode *> >::iterator
- I = CountersBySP.begin(), E = CountersBySP.end();
- I != E; ++I) {
- DISubprogram SP(I->second);
- intptr_t ident = reinterpret_cast<intptr_t>(I->second);
- Builder.CreateCall2(EmitFunction,
- ConstantInt::get(Type::getInt32Ty(*Ctx), ident),
- Builder.CreateGlobalStringPtr(SP.getName()));
-
- GlobalVariable *GV = I->first;
+ Builder.CreateCall2(StartFile,
+ Builder.CreateGlobalStringPtr(FilenameGcda),
+ Builder.CreateGlobalStringPtr(ReversedVersion));
+ for (unsigned j = 0, e = CountersBySP.size(); j != e; ++j) {
+ DISubprogram SP(CountersBySP[j].second);
+ Builder.CreateCall3(EmitFunction,
+ Builder.getInt32(j),
+ Options.FunctionNamesInData ?
+ Builder.CreateGlobalStringPtr(SP.getName()) :
+ Constant::getNullValue(Builder.getInt8PtrTy()),
+ Builder.getInt8(Options.UseCfgChecksum));
+
+ GlobalVariable *GV = CountersBySP[j].first;
unsigned Arcs =
cast<ArrayType>(GV->getType()->getElementType())->getNumElements();
Builder.CreateCall2(EmitArcs,
- ConstantInt::get(Type::getInt32Ty(*Ctx), Arcs),
+ Builder.getInt32(Arcs),
Builder.CreateConstGEP2_64(GV, 0, 0));
}
Builder.CreateCall(EndFile);
}
}
- Builder.CreateRetVoid();
- // 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(Attribute::NoInline);
- if (NoRedZone)
- F->addFnAttr(Attribute::NoRedZone);
-
- 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);
+ return WriteoutF;
}
void GCOVProfiler::insertIndirectCounterIncrement() {
@@ -711,13 +752,9 @@ void GCOVProfiler::insertIndirectCounterIncrement() {
Fn->setUnnamedAddr(true);
Fn->setLinkage(GlobalValue::InternalLinkage);
Fn->addFnAttr(Attribute::NoInline);
- if (NoRedZone)
+ if (Options.NoRedZone)
Fn->addFnAttr(Attribute::NoRedZone);
- 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);
@@ -731,26 +768,27 @@ void GCOVProfiler::insertIndirectCounterIncrement() {
Argument *Arg = Fn->arg_begin();
Arg->setName("predecessor");
Value *Pred = Builder.CreateLoad(Arg, "pred");
- Value *Cond = Builder.CreateICmpEQ(Pred, NegOne);
+ Value *Cond = Builder.CreateICmpEQ(Pred, Builder.getInt32(0xffffffff));
BranchInst::Create(Exit, PredNotNegOne, Cond, BB);
Builder.SetInsertPoint(PredNotNegOne);
// uint64_t *counter = counters[pred];
// if (!counter) return;
- Value *ZExtPred = Builder.CreateZExt(Pred, Int64Ty);
+ Value *ZExtPred = Builder.CreateZExt(Pred, Builder.getInt64Ty());
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()));
+ Constant::getNullValue(
+ Builder.getInt64Ty()->getPointerTo()));
Builder.CreateCondBr(Cond, Exit, CounterEnd);
// ++*counter;
Builder.SetInsertPoint(CounterEnd);
Value *Add = Builder.CreateAdd(Builder.CreateLoad(Counter),
- ConstantInt::get(Int64Ty, 1));
+ Builder.getInt64(1));
Builder.CreateStore(Add, Counter);
Builder.CreateBr(Exit);
@@ -759,18 +797,18 @@ void GCOVProfiler::insertIndirectCounterIncrement() {
Builder.CreateRetVoid();
}
-void GCOVProfiler::
+Function *GCOVProfiler::
insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> > CountersBySP) {
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
- Function *FlushF = M->getFunction("__gcov_flush");
+ Function *FlushF = M->getFunction("__llvm_gcov_flush");
if (!FlushF)
FlushF = Function::Create(FTy, GlobalValue::InternalLinkage,
- "__gcov_flush", M);
+ "__llvm_gcov_flush", M);
else
FlushF->setLinkage(GlobalValue::InternalLinkage);
FlushF->setUnnamedAddr(true);
FlushF->addFnAttr(Attribute::NoInline);
- if (NoRedZone)
+ if (Options.NoRedZone)
FlushF->addFnAttr(Attribute::NoRedZone);
BasicBlock *Entry = BasicBlock::Create(*Ctx, "entry", FlushF);
@@ -795,8 +833,10 @@ insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> > CountersBySP) {
if (RetTy == Type::getVoidTy(*Ctx))
Builder.CreateRetVoid();
else if (RetTy->isIntegerTy())
- // Used if __gcov_flush was implicitly declared.
+ // Used if __llvm_gcov_flush was implicitly declared.
Builder.CreateRet(ConstantInt::get(RetTy, 0));
else
- report_fatal_error("invalid return type for __gcov_flush");
+ report_fatal_error("invalid return type for __llvm_gcov_flush");
+
+ return FlushF;
}
generated by cgit v1.1 at 2025-08-15 14:42:54 +0000