#define DEBUG_TYPE "insert-gcov-profiling"
-#include "ProfilingUtils.h"
#include "llvm/Transforms/Instrumentation.h"
-#include "llvm/Analysis/DebugInfo.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 "ProfilingUtils.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/DebugInfo.h"
+#include "llvm/IR/IRBuilder.h"
+#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/FileSystem.h"
+#include "llvm/Support/InstIterator.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/ModuleUtils.h"
+#include <algorithm>
#include <string>
#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) {
+ 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 = false)
- : ModulePass(ID), EmitNotes(EmitNotes), EmitData(EmitData),
- Use402Format(use402Format) {
- 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 {
private:
bool runOnModule(Module &M);
- // Create the GCNO files for the Module based on DebugInfo.
- void emitGCNO(DebugInfoFinder &DIF);
+ // 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.
- bool emitProfileArcs(DebugInfoFinder &DIF);
+ bool emitProfileArcs();
// Get pointers to the functions in the runtime library.
Constant *getStartFileFunc();
Constant *getIncrementIndirectCounterFunc();
Constant *getEmitFunctionFunc();
Constant *getEmitArcsFunc();
+ Constant *getDeleteWriteoutFunctionListFunc();
+ Constant *getDeleteFlushFunctionListFunc();
Constant *getEndFileFunc();
// Create or retrieve an i32 state value that is used to represent the
// 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(DebugInfoFinder &,
- SmallVector<std::pair<GlobalVariable *,
- MDNode *>, 8> &);
+ Function *insertCounterWriteout(ArrayRef<std::pair<GlobalVariable*,
+ MDNode*> >);
+ Function *insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
+ void insertIndirectCounterIncrement();
+
+ std::string mangleName(DICompileUnit CU, const char *NewStem);
- std::string mangleName(DICompileUnit CU, std::string NewStem);
+ GCOVOptions Options;
- bool EmitNotes;
- bool EmitData;
- bool Use402Format;
+ // Reversed, NUL-terminated copy of Options.Version.
+ char ReversedVersion[5];
Module *M;
LLVMContext *Ctx;
INITIALIZE_PASS(GCOVProfiler, "insert-gcov-profiling",
"Insert instrumentation for GCOV profiling", false, false)
-ModulePass *llvm::createGCOVProfilerPass(bool EmitNotes, bool EmitData,
- bool Use402Format) {
- return new GCOVProfiler(EmitNotes, EmitData, Use402Format);
+ModulePass *llvm::createGCOVProfilerPass(const GCOVOptions &Options) {
+ return new GCOVProfiler(Options);
}
-static DISubprogram findSubprogram(DIScope Scope) {
- while (!Scope.isSubprogram()) {
- assert(Scope.isLexicalBlock() &&
- "Debug location not lexical block or subprogram");
- Scope = DILexicalBlock(Scope).getContext();
- }
- return DISubprogram(Scope);
+static std::string getFunctionName(DISubprogram SP) {
+ if (!SP.getLinkageName().empty())
+ return SP.getLinkageName();
+ return SP.getName();
}
namespace {
class GCOVRecord {
protected:
- static const char *LinesTag;
- static const char *FunctionTag;
- static const char *BlockTag;
- static const char *EdgeTag;
+ static const char *const LinesTag;
+ static const char *const FunctionTag;
+ static const char *const BlockTag;
+ static const char *const EdgeTag;
GCOVRecord() {}
// Returns the length measured in 4-byte blocks that will be used to
// represent this string in a GCOV file
- unsigned lengthOfGCOVString(StringRef s) {
+ static unsigned lengthOfGCOVString(StringRef s) {
// A GCOV string is a length, followed by a NUL, then between 0 and 3 NULs
// padding out to the next 4-byte word. The length is measured in 4-byte
// words including padding, not bytes of actual string.
raw_ostream *os;
};
- const char *GCOVRecord::LinesTag = "\0\0\x45\x01";
- const char *GCOVRecord::FunctionTag = "\0\0\0\1";
- const char *GCOVRecord::BlockTag = "\0\0\x41\x01";
- const char *GCOVRecord::EdgeTag = "\0\0\x43\x01";
+ const char *const GCOVRecord::LinesTag = "\0\0\x45\x01";
+ const char *const GCOVRecord::FunctionTag = "\0\0\0\1";
+ const char *const GCOVRecord::BlockTag = "\0\0\x41\x01";
+ const char *const GCOVRecord::EdgeTag = "\0\0\x43\x01";
class GCOVFunction;
class GCOVBlock;
Lines.push_back(Line);
}
- uint32_t length() {
+ uint32_t length() const {
+ // Here 2 = 1 for string length + 1 for '0' id#.
return lengthOfGCOVString(Filename) + 2 + Lines.size();
}
- private:
- friend class GCOVBlock;
+ void writeOut() {
+ write(0);
+ writeGCOVString(Filename);
+ for (int i = 0, e = Lines.size(); i != e; ++i)
+ write(Lines[i]);
+ }
- GCOVLines(std::string Filename, raw_ostream *os)
- : Filename(Filename) {
+ GCOVLines(StringRef F, raw_ostream *os)
+ : Filename(F) {
this->os = os;
}
- std::string Filename;
+ private:
+ StringRef Filename;
SmallVector<uint32_t, 32> Lines;
};
+
+ // Sorting function for deterministic behaviour in GCOVBlock::writeOut.
+ struct StringKeySort {
+ bool operator()(StringMapEntry<GCOVLines *> *LHS,
+ StringMapEntry<GCOVLines *> *RHS) const {
+ return LHS->getKey() < RHS->getKey();
+ }
+ };
+
// Represent a basic block in GCOV. Each block has a unique number in the
// function, number of lines belonging to each block, and a set of edges to
// other blocks.
class GCOVBlock : public GCOVRecord {
public:
- GCOVLines &getFile(std::string Filename) {
+ GCOVLines &getFile(StringRef Filename) {
GCOVLines *&Lines = LinesByFile[Filename];
if (!Lines) {
Lines = new GCOVLines(Filename, os);
void writeOut() {
uint32_t Len = 3;
+ SmallVector<StringMapEntry<GCOVLines *> *, 32> SortedLinesByFile;
for (StringMap<GCOVLines *>::iterator I = LinesByFile.begin(),
E = LinesByFile.end(); I != E; ++I) {
Len += I->second->length();
+ SortedLinesByFile.push_back(&*I);
}
writeBytes(LinesTag, 4);
write(Len);
write(Number);
- for (StringMap<GCOVLines *>::iterator I = LinesByFile.begin(),
- E = LinesByFile.end(); I != E; ++I) {
- write(0);
- writeGCOVString(I->second->Filename);
- for (int i = 0, e = I->second->Lines.size(); i != e; ++i) {
- write(I->second->Lines[i]);
- }
- }
+
+ StringKeySort Sorter;
+ std::sort(SortedLinesByFile.begin(), SortedLinesByFile.end(), Sorter);
+ for (SmallVectorImpl<StringMapEntry<GCOVLines *> *>::iterator
+ I = SortedLinesByFile.begin(), E = SortedLinesByFile.end();
+ I != E; ++I)
+ (*I)->getValue()->writeOut();
write(0);
write(0);
}
// 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) {
+ GCOVFunction(DISubprogram SP, raw_ostream *os, uint32_t Ident,
+ bool UseCfgChecksum) {
this->os = os;
Function *F = SP.getFunction();
+ DEBUG(dbgs() << "Function: " << F->getName() << "\n");
uint32_t i = 0;
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
Blocks[BB] = new GCOVBlock(i++, os);
ReturnBlock = new GCOVBlock(i++, os);
writeBytes(FunctionTag, 4);
- uint32_t BlockLen = 1 + 1 + 1 + lengthOfGCOVString(SP.getName()) +
+ uint32_t BlockLen = 1 + 1 + 1 + lengthOfGCOVString(getFunctionName(SP)) +
1 + lengthOfGCOVString(SP.getFilename()) + 1;
- if (!Use402Format)
- ++BlockLen; // For second checksum.
+ if (UseCfgChecksum)
+ ++BlockLen;
write(BlockLen);
- uint32_t Ident = reinterpret_cast<intptr_t>((MDNode*)SP);
write(Ident);
- write(0); // checksum #1
- if (!Use402Format)
- write(0); // checksum #2
- writeGCOVString(SP.getName());
+ write(0); // lineno checksum
+ if (UseCfgChecksum)
+ write(0); // cfg checksum
+ writeGCOVString(getFunctionName(SP));
writeGCOVString(SP.getFilename());
write(SP.getLineNumber());
}
for (int i = 0, e = Blocks.size() + 1; i != e; ++i) {
write(0); // No flags on our blocks.
}
+ DEBUG(dbgs() << Blocks.size() << " blocks.\n");
// Emit edges between blocks.
- for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = Blocks.begin(),
- E = Blocks.end(); I != E; ++I) {
- GCOVBlock &Block = *I->second;
+ if (Blocks.empty()) return;
+ Function *F = Blocks.begin()->first->getParent();
+ for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) {
+ GCOVBlock &Block = *Blocks[I];
if (Block.OutEdges.empty()) continue;
writeBytes(EdgeTag, 4);
write(Block.OutEdges.size() * 2 + 1);
write(Block.Number);
for (int i = 0, e = Block.OutEdges.size(); i != e; ++i) {
+ DEBUG(dbgs() << Block.Number << " -> " << Block.OutEdges[i]->Number
+ << "\n");
write(Block.OutEdges[i]->Number);
write(0); // no flags
}
}
// Emit lines for each block.
- for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = Blocks.begin(),
- E = Blocks.end(); I != E; ++I) {
- I->second->writeOut();
+ for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) {
+ Blocks[I]->writeOut();
}
}
};
}
-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);
SmallString<128> Filename = CU.getFilename();
sys::path::replace_extension(Filename, NewStem);
- return sys::path::filename(Filename.str());
+ StringRef FName = sys::path::filename(Filename);
+ SmallString<128> CurPath;
+ if (sys::fs::current_path(CurPath)) return FName;
+ sys::path::append(CurPath, FName.str());
+ return CurPath.str();
}
bool GCOVProfiler::runOnModule(Module &M) {
this->M = &M;
Ctx = &M.getContext();
- DebugInfoFinder DIF;
- DIF.processModule(M);
-
- if (EmitNotes) emitGCNO(DIF);
- if (EmitData) return emitProfileArcs(DIF);
+ if (Options.EmitNotes) emitProfileNotes();
+ if (Options.EmitData) return emitProfileArcs();
return false;
}
-void GCOVProfiler::emitGCNO(DebugInfoFinder &DIF) {
- DenseMap<const MDNode *, raw_fd_ostream *> GcnoFiles;
- for (DebugInfoFinder::iterator I = DIF.compile_unit_begin(),
- E = DIF.compile_unit_end(); I != E; ++I) {
+void GCOVProfiler::emitProfileNotes() {
+ NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
+ if (!CU_Nodes) return;
+
+ for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
// Each compile unit gets its own .gcno file. This means that whether we run
// this pass over the original .o's as they're produced, or run it after
// LTO, we'll generate the same .gcno files.
- DICompileUnit CU(*I);
- raw_fd_ostream *&out = GcnoFiles[CU];
+ DICompileUnit CU(CU_Nodes->getOperand(i));
std::string ErrorInfo;
- out = new raw_fd_ostream(mangleName(CU, "gcno").c_str(), ErrorInfo,
- raw_fd_ostream::F_Binary);
- if (!Use402Format)
- out->write("oncg*404MVLL", 12);
- else
- out->write("oncg*402MVLL", 12);
- }
+ raw_fd_ostream out(mangleName(CU, "gcno").c_str(), ErrorInfo,
+ sys::fs::F_Binary);
+ 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) {
+ DISubprogram SP(SPs.getElement(i));
+ assert((!SP || SP.isSubprogram()) &&
+ "A MDNode in subprograms of a CU should be null or a DISubprogram.");
+ if (!SP)
+ continue;
- for (DebugInfoFinder::iterator SPI = DIF.subprogram_begin(),
- SPE = DIF.subprogram_end(); SPI != SPE; ++SPI) {
- DISubprogram SP(*SPI);
- raw_fd_ostream *&os = GcnoFiles[SP.getCompileUnit()];
-
- Function *F = SP.getFunction();
- if (!F) continue;
- GCOVFunction Func(SP, os, Use402Format);
-
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
- GCOVBlock &Block = Func.getBlock(BB);
- TerminatorInst *TI = BB->getTerminator();
- if (int successors = TI->getNumSuccessors()) {
- for (int i = 0; i != successors; ++i) {
- Block.addEdge(Func.getBlock(TI->getSuccessor(i)));
- }
- } else if (isa<ReturnInst>(TI)) {
- Block.addEdge(Func.getReturnBlock());
- }
+ Function *F = SP.getFunction();
+ if (!F) continue;
+ GCOVFunction Func(SP, &out, i, Options.UseCfgChecksum);
- uint32_t Line = 0;
- for (BasicBlock::iterator I = BB->begin(), IE = BB->end(); I != IE; ++I) {
- const DebugLoc &Loc = I->getDebugLoc();
- if (Loc.isUnknown()) continue;
- if (Line == Loc.getLine()) continue;
- Line = Loc.getLine();
- if (SP != findSubprogram(DIScope(Loc.getScope(*Ctx)))) continue;
+ for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
+ GCOVBlock &Block = Func.getBlock(BB);
+ TerminatorInst *TI = BB->getTerminator();
+ if (int successors = TI->getNumSuccessors()) {
+ for (int i = 0; i != successors; ++i) {
+ Block.addEdge(Func.getBlock(TI->getSuccessor(i)));
+ }
+ } else if (isa<ReturnInst>(TI)) {
+ Block.addEdge(Func.getReturnBlock());
+ }
- GCOVLines &Lines = Block.getFile(SP.getFilename());
- Lines.addLine(Loc.getLine());
+ uint32_t Line = 0;
+ for (BasicBlock::iterator I = BB->begin(), IE = BB->end();
+ I != IE; ++I) {
+ const DebugLoc &Loc = I->getDebugLoc();
+ if (Loc.isUnknown()) continue;
+ if (Line == Loc.getLine()) continue;
+ Line = Loc.getLine();
+ if (SP != getDISubprogram(Loc.getScope(*Ctx))) continue;
+
+ GCOVLines &Lines = Block.getFile(SP.getFilename());
+ Lines.addLine(Loc.getLine());
+ }
}
+ Func.writeOut();
}
- Func.writeOut();
- }
-
- for (DenseMap<const MDNode *, raw_fd_ostream *>::iterator
- I = GcnoFiles.begin(), E = GcnoFiles.end(); I != E; ++I) {
- raw_fd_ostream *&out = I->second;
- out->write("\0\0\0\0\0\0\0\0", 8); // EOF
- out->close();
- delete out;
+ out.write("\0\0\0\0\0\0\0\0", 8); // EOF
+ out.close();
}
}
-bool GCOVProfiler::emitProfileArcs(DebugInfoFinder &DIF) {
- if (DIF.subprogram_begin() == DIF.subprogram_end())
- return false;
-
- SmallVector<std::pair<GlobalVariable *, MDNode *>, 8> CountersBySP;
- for (DebugInfoFinder::iterator SPI = DIF.subprogram_begin(),
- SPE = DIF.subprogram_end(); SPI != SPE; ++SPI) {
- DISubprogram SP(*SPI);
- Function *F = SP.getFunction();
- if (!F) continue;
-
- unsigned Edges = 0;
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
- TerminatorInst *TI = BB->getTerminator();
- if (isa<ReturnInst>(TI))
- ++Edges;
- else
- Edges += TI->getNumSuccessors();
- }
-
- ArrayType *CounterTy =
+bool GCOVProfiler::emitProfileArcs() {
+ NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
+ 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();
+ SmallVector<std::pair<GlobalVariable *, MDNode *>, 8> CountersBySP;
+ for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
+ DISubprogram SP(SPs.getElement(i));
+ assert((!SP || SP.isSubprogram()) &&
+ "A MDNode in subprograms of a CU should be null or a DISubprogram.");
+ if (!SP)
+ continue;
+ Function *F = SP.getFunction();
+ if (!F) continue;
+ if (!Result) Result = true;
+ unsigned Edges = 0;
+ for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
+ TerminatorInst *TI = BB->getTerminator();
+ if (isa<ReturnInst>(TI))
+ ++Edges;
+ else
+ Edges += TI->getNumSuccessors();
+ }
+
+ ArrayType *CounterTy =
ArrayType::get(Type::getInt64Ty(*Ctx), Edges);
- GlobalVariable *Counters =
+ GlobalVariable *Counters =
new GlobalVariable(*M, CounterTy, false,
GlobalValue::InternalLinkage,
Constant::getNullValue(CounterTy),
- "__llvm_gcov_ctr", 0, false, 0);
- CountersBySP.push_back(std::make_pair(Counters, (MDNode*)SP));
-
- UniqueVector<BasicBlock *> ComplexEdgePreds;
- UniqueVector<BasicBlock *> ComplexEdgeSuccs;
-
- unsigned Edge = 0;
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
- TerminatorInst *TI = BB->getTerminator();
- int Successors = isa<ReturnInst>(TI) ? 1 : TI->getNumSuccessors();
- if (Successors) {
- IRBuilder<> Builder(TI);
-
- if (Successors == 1) {
- Value *Counter = Builder.CreateConstInBoundsGEP2_64(Counters, 0,
- Edge);
- Value *Count = Builder.CreateLoad(Counter);
- Count = Builder.CreateAdd(Count,
- ConstantInt::get(Type::getInt64Ty(*Ctx),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));
- SmallVector<Value *, 2> Idx;
- Idx.push_back(Constant::getNullValue(Type::getInt64Ty(*Ctx)));
- 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));
- Builder.CreateStore(Count, Counter);
- } else {
- ComplexEdgePreds.insert(BB);
- for (int i = 0; i != Successors; ++i)
- ComplexEdgeSuccs.insert(TI->getSuccessor(i));
+ "__llvm_gcov_ctr");
+ CountersBySP.push_back(std::make_pair(Counters, (MDNode*)SP));
+
+ UniqueVector<BasicBlock *> ComplexEdgePreds;
+ UniqueVector<BasicBlock *> ComplexEdgeSuccs;
+
+ unsigned Edge = 0;
+ for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
+ TerminatorInst *TI = BB->getTerminator();
+ int Successors = isa<ReturnInst>(TI) ? 1 : TI->getNumSuccessors();
+ if (Successors) {
+ IRBuilder<> Builder(TI);
+
+ if (Successors == 1) {
+ Value *Counter = Builder.CreateConstInBoundsGEP2_64(Counters, 0,
+ Edge);
+ Value *Count = Builder.CreateLoad(Counter);
+ 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(),
+ Builder.getInt64(Edge),
+ Builder.getInt64(Edge + 1));
+ SmallVector<Value *, 2> Idx;
+ 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, Builder.getInt64(1));
+ Builder.CreateStore(Count, Counter);
+ } else {
+ ComplexEdgePreds.insert(BB);
+ for (int i = 0; i != Successors; ++i)
+ ComplexEdgeSuccs.insert(TI->getSuccessor(i));
+ }
+ Edge += Successors;
}
- Edge += Successors;
}
- }
-
- if (!ComplexEdgePreds.empty()) {
- GlobalVariable *EdgeTable =
+
+ if (!ComplexEdgePreds.empty()) {
+ GlobalVariable *EdgeTable =
buildEdgeLookupTable(F, Counters,
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);
- }
- for (int i = 0, e = ComplexEdgeSuccs.size(); i != e; ++i) {
- // call runtime to perform increment
- IRBuilder<> Builder(ComplexEdgeSuccs[i+1]->getFirstNonPHI());
- Value *CounterPtrArray =
+ GlobalVariable *EdgeState = getEdgeStateValue();
+
+ for (int i = 0, e = ComplexEdgePreds.size(); i != e; ++i) {
+ IRBuilder<> Builder(ComplexEdgePreds[i+1]->getTerminator());
+ Builder.CreateStore(Builder.getInt32(i), EdgeState);
+ }
+ for (int i = 0, e = ComplexEdgeSuccs.size(); i != e; ++i) {
+ // call runtime to perform increment
+ BasicBlock::iterator InsertPt =
+ ComplexEdgeSuccs[i+1]->getFirstInsertionPt();
+ IRBuilder<> Builder(InsertPt);
+ Value *CounterPtrArray =
Builder.CreateConstInBoundsGEP2_64(EdgeTable, 0,
i * ComplexEdgePreds.size());
- Builder.CreateCall2(getIncrementIndirectCounterFunc(),
- EdgeState, CounterPtrArray);
- // clear the predecessor number
- Builder.CreateStore(ConstantInt::get(Int32Ty, 0xffffffff), EdgeState);
+
+ // Build code to increment the counter.
+ InsertIndCounterIncrCode = true;
+ Builder.CreateCall2(getIncrementIndirectCounterFunc(),
+ EdgeState, CounterPtrArray);
+ }
}
}
+
+ 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(Type::getVoidTy(*Ctx), false);
+ Type *Params[] = {
+ PointerType::get(FTy, 0),
+ PointerType::get(FTy, 0)
+ };
+ FTy = FunctionType::get(Builder.getVoidTy(), Params, false);
+
+ // Inialize the environment and register the local writeout and flush
+ // functions.
+ Constant *GCOVInit = M->getOrInsertFunction("llvm_gcov_init", FTy);
+ Builder.CreateCall2(GCOVInit, WriteoutF, FlushF);
+ Builder.CreateRetVoid();
+
+ appendToGlobalCtors(*M, F, 0);
}
- insertCounterWriteout(DIF, CountersBySP);
+ if (InsertIndCounterIncrCode)
+ insertIndirectCounterIncrement();
- return true;
+ return Result;
}
// All edges with successors that aren't branches are "complex", because it
// 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;
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);
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,
}
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);
}
Constant *GCOVProfiler::getIncrementIndirectCounterFunc() {
+ Type *Int32Ty = Type::getInt32Ty(*Ctx);
+ Type *Int64Ty = Type::getInt64Ty(*Ctx);
Type *Args[] = {
- Type::getInt32PtrTy(*Ctx), // uint32_t *predecessor
- Type::getInt64PtrTy(*Ctx)->getPointerTo(), // uint64_t **state_table_row
+ Int32Ty->getPointerTo(), // uint32_t *predecessor
+ Int64Ty->getPointerTo()->getPointerTo() // uint64_t **counters
};
- FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
- Args, false);
- return M->getOrInsertFunction("llvm_gcda_increment_indirect_counter", FTy);
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
+ return M->getOrInsertFunction("__llvm_gcov_indirect_counter_increment", FTy);
}
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);
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
return M->getOrInsertFunction("llvm_gcda_emit_function", FTy);
}
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::getDeleteWriteoutFunctionListFunc() {
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ return M->getOrInsertFunction("llvm_delete_writeout_function_list", 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);
return GV;
}
-void GCOVProfiler::insertCounterWriteout(
- DebugInfoFinder &DIF,
- 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);
+Function *GCOVProfiler::insertCounterWriteout(
+ 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);
+ WriteoutF->addFnAttr(Attribute::NoInline);
+ if (Options.NoRedZone)
+ WriteoutF->addFnAttr(Attribute::NoRedZone);
+
+ BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", WriteoutF);
IRBuilder<> Builder(BB);
Constant *StartFile = getStartFileFunc();
Constant *EmitArcs = getEmitArcsFunc();
Constant *EndFile = getEndFileFunc();
- for (DebugInfoFinder::iterator CUI = DIF.compile_unit_begin(),
- CUE = DIF.compile_unit_end(); CUI != CUE; ++CUI) {
- DICompileUnit compile_unit(*CUI);
- std::string FilenameGcda = mangleName(compile_unit, "gcda");
- Builder.CreateCall(StartFile,
- Builder.CreateGlobalStringPtr(FilenameGcda));
- for (SmallVector<std::pair<GlobalVariable *, MDNode *>, 8>::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;
- unsigned Arcs =
+ NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
+ if (CU_Nodes) {
+ for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
+ DICompileUnit CU(CU_Nodes->getOperand(i));
+ std::string FilenameGcda = mangleName(CU, "gcda");
+ 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(getFunctionName(SP)) :
+ 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.CreateConstGEP2_64(GV, 0, 0));
+ Builder.CreateCall2(EmitArcs,
+ Builder.getInt32(Arcs),
+ Builder.CreateConstGEP2_64(GV, 0, 0));
+ }
+ Builder.CreateCall(EndFile);
}
- Builder.CreateCall(EndFile);
}
+
Builder.CreateRetVoid();
+ return WriteoutF;
+}
+
+void GCOVProfiler::insertIndirectCounterIncrement() {
+ Function *Fn =
+ cast<Function>(GCOVProfiler::getIncrementIndirectCounterFunc());
+ Fn->setUnnamedAddr(true);
+ Fn->setLinkage(GlobalValue::InternalLinkage);
+ Fn->addFnAttr(Attribute::NoInline);
+ if (Options.NoRedZone)
+ Fn->addFnAttr(Attribute::NoRedZone);
+
+ // 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, 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, 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(
+ Builder.getInt64Ty()->getPointerTo()));
+ Builder.CreateCondBr(Cond, Exit, CounterEnd);
+
+ // ++*counter;
+ Builder.SetInsertPoint(CounterEnd);
+ Value *Add = Builder.CreateAdd(Builder.CreateLoad(Counter),
+ Builder.getInt64(1));
+ Builder.CreateStore(Add, Counter);
+ Builder.CreateBr(Exit);
+
+ // Fill in the exit block.
+ Builder.SetInsertPoint(Exit);
+ Builder.CreateRetVoid();
+}
+
+Function *GCOVProfiler::
+insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> > CountersBySP) {
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ Function *FlushF = M->getFunction("__llvm_gcov_flush");
+ if (!FlushF)
+ FlushF = Function::Create(FTy, GlobalValue::InternalLinkage,
+ "__llvm_gcov_flush", M);
+ else
+ FlushF->setLinkage(GlobalValue::InternalLinkage);
+ FlushF->setUnnamedAddr(true);
+ FlushF->addFnAttr(Attribute::NoInline);
+ if (Options.NoRedZone)
+ FlushF->addFnAttr(Attribute::NoRedZone);
+
+ 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 __llvm_gcov_flush was implicitly declared.
+ Builder.CreateRet(ConstantInt::get(RetTy, 0));
+ else
+ report_fatal_error("invalid return type for __llvm_gcov_flush");
- InsertProfilingShutdownCall(WriteoutF, M);
+ return FlushF;
}
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