#define DEBUG_TYPE "insert-gcov-profiling"
-#include "ProfilingUtils.h"
#include "llvm/Transforms/Instrumentation.h"
-#include "llvm/Analysis/DebugInfo.h"
+#include "ProfilingUtils.h"
+#include "llvm/ADT/DenseMap.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/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/StringExtras.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/UniqueVector.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/ModuleUtils.h"
#include <string>
#include <utility>
using namespace llvm;
namespace {
class GCOVProfiler : public ModulePass {
- bool runOnModule(Module &M);
public:
static char ID;
- GCOVProfiler() : ModulePass(ID) {
+ GCOVProfiler()
+ : ModulePass(ID), EmitNotes(true), EmitData(true), Use402Format(false),
+ UseExtraChecksum(false), NoRedZone(false) {
+ initializeGCOVProfilerPass(*PassRegistry::getPassRegistry());
+ }
+ GCOVProfiler(bool EmitNotes, bool EmitData, bool use402Format = false,
+ bool useExtraChecksum = false, bool NoRedZone = false)
+ : ModulePass(ID), EmitNotes(EmitNotes), EmitData(EmitData),
+ Use402Format(use402Format), UseExtraChecksum(useExtraChecksum) {
+ assert((EmitNotes || EmitData) && "GCOVProfiler asked to do nothing?");
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(DebugInfoFinder &DIF);
+ void emitGCNO();
+
+ // Modify the program to track transitions along edges and call into the
+ // profiling runtime to emit .gcda files when run.
+ bool emitProfileArcs();
// Get pointers to the functions in the runtime library.
Constant *getStartFileFunc();
+ Constant *getIncrementIndirectCounterFunc();
Constant *getEmitFunctionFunc();
Constant *getEmitArcsFunc();
Constant *getEndFileFunc();
+ // Create or retrieve an i32 state value that is used to represent the
+ // pred block number for certain non-trivial edges.
+ GlobalVariable *getEdgeStateValue();
+
+ // Produce a table of pointers to counters, by predecessor and successor
+ // block number.
+ GlobalVariable *buildEdgeLookupTable(Function *F,
+ GlobalVariable *Counter,
+ 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 *,
- uint32_t>, 8> &);
+ void insertCounterWriteout(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
+ void insertIndirectCounterIncrement();
+ void insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
+
+ std::string mangleName(DICompileUnit CU, const char *NewStem);
- Module *Mod;
+ bool EmitNotes;
+ bool EmitData;
+ bool Use402Format;
+ bool UseExtraChecksum;
+ bool NoRedZone;
+
+ Module *M;
LLVMContext *Ctx;
};
}
INITIALIZE_PASS(GCOVProfiler, "insert-gcov-profiling",
"Insert instrumentation for GCOV profiling", false, false)
-ModulePass *llvm::createGCOVProfilerPass() { return new GCOVProfiler(); }
-
-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);
+ModulePass *llvm::createGCOVProfilerPass(bool EmitNotes, bool EmitData,
+ bool Use402Format,
+ bool UseExtraChecksum,
+ bool NoRedZone) {
+ return new GCOVProfiler(EmitNotes, EmitData, Use402Format, UseExtraChecksum,
+ NoRedZone);
}
namespace {
class GCOVRecord {
protected:
- static const char *lines_tag;
- static const char *function_tag;
- static const char *block_tag;
- static const char *edge_tag;
+ static const char *LinesTag;
+ static const char *FunctionTag;
+ static const char *BlockTag;
+ static const char *EdgeTag;
GCOVRecord() {}
- void WriteBytes(const char *b, int size) {
- os->write(b, size);
+ void writeBytes(const char *Bytes, int Size) {
+ os->write(Bytes, Size);
}
- void Write(uint32_t i) {
- WriteBytes(reinterpret_cast<char*>(&i), 4);
+ void write(uint32_t i) {
+ writeBytes(reinterpret_cast<char*>(&i), 4);
}
// Returns the length measured in 4-byte blocks that will be used to
// represent this string in a GCOV file
- unsigned LengthOfGCOVString(StringRef s) {
+ 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.
- return (s.size() + 5) / 4;
+ // padding out to the next 4-byte word. The length is measured in 4-byte
+ // words including padding, not bytes of actual string.
+ return (s.size() / 4) + 1;
}
- void WriteGCOVString(StringRef s) {
- uint32_t len = LengthOfGCOVString(s);
- Write(len);
- WriteBytes(s.data(), s.size());
+ void writeGCOVString(StringRef s) {
+ uint32_t Len = lengthOfGCOVString(s);
+ write(Len);
+ writeBytes(s.data(), s.size());
// Write 1 to 4 bytes of NUL padding.
- assert((unsigned)(5 - ((s.size() + 1) % 4)) > 0);
- assert((unsigned)(5 - ((s.size() + 1) % 4)) <= 4);
- WriteBytes("\0\0\0\0", 5 - ((s.size() + 1) % 4));
+ assert((unsigned)(4 - (s.size() % 4)) > 0);
+ assert((unsigned)(4 - (s.size() % 4)) <= 4);
+ writeBytes("\0\0\0\0", 4 - (s.size() % 4));
}
raw_ostream *os;
};
- const char *GCOVRecord::lines_tag = "\0\0\x45\x01";
- const char *GCOVRecord::function_tag = "\0\0\0\1";
- const char *GCOVRecord::block_tag = "\0\0\x41\x01";
- const char *GCOVRecord::edge_tag = "\0\0\x43\x01";
+ 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";
class GCOVFunction;
class GCOVBlock;
// to the block.
class GCOVLines : public GCOVRecord {
public:
- void AddLine(uint32_t line) {
- lines.push_back(line);
+ void addLine(uint32_t Line) {
+ Lines.push_back(Line);
}
- uint32_t Length() {
- return LengthOfGCOVString(filename) + 2 + lines.size();
+ uint32_t length() {
+ // 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;
- SmallVector<uint32_t, 32> lines;
+ private:
+ StringRef Filename;
+ SmallVector<uint32_t, 32> Lines;
};
// Represent a basic block in GCOV. Each block has a unique number in the
// other blocks.
class GCOVBlock : public GCOVRecord {
public:
- GCOVLines &GetFile(std::string filename) {
- GCOVLines *&lines = lines_by_file[filename];
- if (!lines) {
- lines = new GCOVLines(filename, os);
+ GCOVLines &getFile(StringRef Filename) {
+ GCOVLines *&Lines = LinesByFile[Filename];
+ if (!Lines) {
+ Lines = new GCOVLines(Filename, os);
}
- return *lines;
+ return *Lines;
}
- void AddEdge(GCOVBlock &successor) {
- out_edges.push_back(&successor);
+ void addEdge(GCOVBlock &Successor) {
+ OutEdges.push_back(&Successor);
}
- void WriteOut() {
- uint32_t len = 3;
- for (StringMap<GCOVLines *>::iterator I = lines_by_file.begin(),
- E = lines_by_file.end(); I != E; ++I) {
- len += I->second->Length();
+ void writeOut() {
+ uint32_t Len = 3;
+ for (StringMap<GCOVLines *>::iterator I = LinesByFile.begin(),
+ E = LinesByFile.end(); I != E; ++I) {
+ Len += I->second->length();
}
- WriteBytes(lines_tag, 4);
- Write(len);
- Write(number);
- for (StringMap<GCOVLines *>::iterator I = lines_by_file.begin(),
- E = lines_by_file.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]);
- }
- }
- Write(0);
- Write(0);
+ writeBytes(LinesTag, 4);
+ write(Len);
+ write(Number);
+ for (StringMap<GCOVLines *>::iterator I = LinesByFile.begin(),
+ E = LinesByFile.end(); I != E; ++I)
+ I->second->writeOut();
+ write(0);
+ write(0);
}
~GCOVBlock() {
- DeleteContainerSeconds(lines_by_file);
+ DeleteContainerSeconds(LinesByFile);
}
private:
friend class GCOVFunction;
- GCOVBlock(uint32_t number, raw_ostream *os)
- : number(number) {
+ GCOVBlock(uint32_t Number, raw_ostream *os)
+ : Number(Number) {
this->os = os;
}
- uint32_t number;
- BasicBlock *block;
- StringMap<GCOVLines *> lines_by_file;
- SmallVector<GCOVBlock *, 4> out_edges;
+ uint32_t Number;
+ StringMap<GCOVLines *> LinesByFile;
+ SmallVector<GCOVBlock *, 4> OutEdges;
};
// A function has a unique identifier, a checksum (we leave as zero) and a
// object users can construct, the blocks and lines will be rooted here.
class GCOVFunction : public GCOVRecord {
public:
- GCOVFunction(DISubprogram SP, raw_ostream *os) {
+ GCOVFunction(DISubprogram SP, raw_ostream *os,
+ bool Use402Format, bool UseExtraChecksum) {
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);
+ Blocks[BB] = new GCOVBlock(i++, os);
}
-
- WriteBytes(function_tag, 4);
- uint32_t block_len = 1 + 1 + 1 + LengthOfGCOVString(SP.getName()) +
- 1 + LengthOfGCOVString(SP.getFilename()) + 1;
- Write(block_len);
- uint32_t ident = reinterpret_cast<intptr_t>((MDNode*)SP);
- Write(ident);
- Write(0); // checksum
- WriteGCOVString(SP.getName());
- WriteGCOVString(SP.getFilename());
- Write(SP.getLineNumber());
+ ReturnBlock = new GCOVBlock(i++, os);
+
+ writeBytes(FunctionTag, 4);
+ uint32_t BlockLen = 1 + 1 + 1 + lengthOfGCOVString(SP.getName()) +
+ 1 + lengthOfGCOVString(SP.getFilename()) + 1;
+ if (UseExtraChecksum)
+ ++BlockLen;
+ write(BlockLen);
+ uint32_t Ident = reinterpret_cast<intptr_t>((MDNode*)SP);
+ write(Ident);
+ write(0); // lineno checksum
+ if (UseExtraChecksum)
+ write(0); // cfg checksum
+ writeGCOVString(SP.getName());
+ writeGCOVString(SP.getFilename());
+ write(SP.getLineNumber());
}
~GCOVFunction() {
- DeleteContainerSeconds(blocks);
+ DeleteContainerSeconds(Blocks);
+ delete ReturnBlock;
}
- GCOVBlock &GetBlock(BasicBlock *BB) {
- return *blocks[BB];
+ GCOVBlock &getBlock(BasicBlock *BB) {
+ return *Blocks[BB];
}
- void WriteOut() {
+ GCOVBlock &getReturnBlock() {
+ return *ReturnBlock;
+ }
+
+ void writeOut() {
// Emit count of blocks.
- WriteBytes(block_tag, 4);
- Write(blocks.size());
- for (int i = 0, e = blocks.size(); i != e; ++i) {
- Write(0); // No flags on our blocks.
+ writeBytes(BlockTag, 4);
+ write(Blocks.size() + 1);
+ 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 (block.out_edges.empty()) continue;
-
- WriteBytes(edge_tag, 4);
- Write(block.out_edges.size() * 2 + 1);
- Write(block.number);
- for (int i = 0, e = block.out_edges.size(); i != e; ++i) {
- Write(block.out_edges[i]->number);
- Write(0); // no flags
+ for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = Blocks.begin(),
+ E = Blocks.end(); I != E; ++I) {
+ GCOVBlock &Block = *I->second;
+ 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 (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = Blocks.begin(),
+ E = Blocks.end(); I != E; ++I) {
+ I->second->writeOut();
}
}
private:
- DenseMap<BasicBlock *, GCOVBlock *> blocks;
+ DenseMap<BasicBlock *, GCOVBlock *> Blocks;
+ GCOVBlock *ReturnBlock;
};
}
-void GCOVProfiler::EmitGCNO(DebugInfoFinder &DIF) {
- DenseMap<const MDNode *, raw_fd_ostream *> gcno_files;
- for (DebugInfoFinder::iterator I = DIF.compile_unit_begin(),
- E = DIF.compile_unit_end(); 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 = gcno_files[CU];
- std::string ErrorInfo;
- Out = new raw_fd_ostream(
- (sys::path::stem(CU.getFilename()) + ".gcno").str().c_str(),
- ErrorInfo, raw_fd_ostream::F_Binary);
- Out->write("oncg*404MVLL", 12);
- }
-
- for (DebugInfoFinder::iterator SPI = DIF.subprogram_begin(),
- SPE = DIF.subprogram_end(); SPI != SPE; ++SPI) {
- DISubprogram SP(*SPI);
- raw_fd_ostream *&os = gcno_files[SP.getCompileUnit()];
-
- GCOVFunction function(SP, os);
- Function *F = SP.getFunction();
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
- GCOVBlock &block = function.GetBlock(BB);
- TerminatorInst *TI = BB->getTerminator();
- if (int successors = TI->getNumSuccessors()) {
- for (int i = 0; i != successors; ++i) {
- block.AddEdge(function.GetBlock(TI->getSuccessor(i)));
- }
- }
-
- 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;
-
- GCOVLines &lines = block.GetFile(SP.getFilename());
- lines.AddLine(loc.getLine());
+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 (N->getNumOperands() != 2) continue;
+ MDString *GCovFile = dyn_cast<MDString>(N->getOperand(0));
+ MDNode *CompileUnit = dyn_cast<MDNode>(N->getOperand(1));
+ if (!GCovFile || !CompileUnit) continue;
+ if (CompileUnit == CU) {
+ SmallString<128> Filename = GCovFile->getString();
+ sys::path::replace_extension(Filename, NewStem);
+ return Filename.str();
}
}
- function.WriteOut();
}
- for (DenseMap<const MDNode *, raw_fd_ostream *>::iterator
- I = gcno_files.begin(), E = gcno_files.end(); I != E; ++I) {
- raw_fd_ostream *&Out = I->second;
- Out->write("\0\0\0\0\0\0\0\0", 4); // EOF
- Out->close();
- delete Out;
- }
+ SmallString<128> Filename = CU.getFilename();
+ sys::path::replace_extension(Filename, NewStem);
+ return sys::path::filename(Filename.str());
}
bool GCOVProfiler::runOnModule(Module &M) {
- Mod = &M;
+ this->M = &M;
Ctx = &M.getContext();
- DebugInfoFinder DIF;
- DIF.processModule(*Mod);
+ if (EmitNotes) emitGCNO();
+ if (EmitData) return emitProfileArcs();
+ return false;
+}
- EmitGCNO(DIF);
+void GCOVProfiler::emitGCNO() {
+ NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
+ if (!CU_Nodes) return;
- SmallVector<std::pair<GlobalVariable *, uint32_t>, 8> counters_by_ident;
- for (DebugInfoFinder::iterator SPI = DIF.subprogram_begin(),
- SPE = DIF.subprogram_end(); SPI != SPE; ++SPI) {
- DISubprogram SP(*SPI);
- Function *F = SP.getFunction();
+ 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.
- // TODO: GCOV format requires a distinct unified exit block.
- unsigned edges = 0;
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
- TerminatorInst *TI = BB->getTerminator();
- edges += TI->getNumSuccessors();
- }
+ DICompileUnit CU(CU_Nodes->getOperand(i));
+ 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);
+
+ DIArray SPs = CU.getSubprograms();
+ for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
+ DISubprogram SP(SPs.getElement(i));
+ if (!SP.Verify()) continue;
- const ArrayType *counter_type =
- ArrayType::get(Type::getInt64Ty(*Ctx), edges);
- GlobalVariable *counter =
- new GlobalVariable(*Mod, counter_type, false,
- GlobalValue::InternalLinkage,
- Constant::getNullValue(counter_type),
- "__llvm_gcov_ctr", 0, false, 0);
- counters_by_ident.push_back(
- std::make_pair(counter, reinterpret_cast<intptr_t>((MDNode*)SP)));
-
- UniqueVector<BasicBlock *> complex_edge_preds;
- UniqueVector<BasicBlock *> complex_edge_succs;
-
- unsigned edge_num = 0;
- for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
- TerminatorInst *TI = BB->getTerminator();
- if (int successors = TI->getNumSuccessors()) {
- IRBuilder<> builder(TI);
-
- if (successors == 1) {
- Value *ctr = builder.CreateConstInBoundsGEP2_64(counter, 0, edge_num);
- Value *count = builder.CreateLoad(ctr);
- count = builder.CreateAdd(count,
- ConstantInt::get(Type::getInt64Ty(*Ctx),1));
- builder.CreateStore(count, ctr);
- } else if (BranchInst *BI = dyn_cast<BranchInst>(TI)) {
- Value *sel = builder.CreateSelect(
- BI->getCondition(),
- ConstantInt::get(Type::getInt64Ty(*Ctx), edge_num),
- ConstantInt::get(Type::getInt64Ty(*Ctx), edge_num + 1));
- SmallVector<Value *, 2> idx;
- idx.push_back(Constant::getNullValue(Type::getInt64Ty(*Ctx)));
- idx.push_back(sel);
- Value *ctr = builder.CreateInBoundsGEP(counter,
- idx.begin(), idx.end());
- Value *count = builder.CreateLoad(ctr);
- count = builder.CreateAdd(count,
- ConstantInt::get(Type::getInt64Ty(*Ctx),1));
- builder.CreateStore(count, ctr);
- } else {
- complex_edge_preds.insert(BB);
+ Function *F = SP.getFunction();
+ if (!F) continue;
+ GCOVFunction Func(SP, &out, Use402Format, UseExtraChecksum);
+
+ 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) {
- complex_edge_succs.insert(TI->getSuccessor(i));
+ Block.addEdge(Func.getBlock(TI->getSuccessor(i)));
}
+ } else if (isa<ReturnInst>(TI)) {
+ Block.addEdge(Func.getReturnBlock());
+ }
+
+ 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());
}
- edge_num += successors;
}
+ Func.writeOut();
}
+ out.write("\0\0\0\0\0\0\0\0", 8); // EOF
+ out.close();
+ }
+}
- // TODO: support switch, invoke, indirectbr
- if (!complex_edge_preds.empty()) {
- // emit a [preds x [succs x i64*]].
- for (int i = 0, e = complex_edge_preds.size(); i != e; ++i) {
- // call runtime to state save
+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));
+ if (!SP.Verify()) 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();
}
- for (int i = 0, e = complex_edge_succs.size(); i != e; ++i) {
- // call runtime to perform increment
+
+ ArrayType *CounterTy =
+ ArrayType::get(Type::getInt64Ty(*Ctx), Edges);
+ GlobalVariable *Counters =
+ new GlobalVariable(*M, CounterTy, false,
+ GlobalValue::InternalLinkage,
+ Constant::getNullValue(CounterTy),
+ "__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,
+ 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));
+ }
+ Edge += Successors;
+ }
+ }
+
+ 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
+ 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.
+ InsertIndCounterIncrCode = true;
+ Builder.CreateCall2(getIncrementIndirectCounterFunc(),
+ EdgeState, CounterPtrArray);
+ }
}
}
+
+ insertCounterWriteout(CountersBySP);
+ insertFlush(CountersBySP);
}
- InsertCounterWriteout(DIF, counters_by_ident);
+ if (InsertIndCounterIncrCode)
+ insertIndirectCounterIncrement();
+
+ return Result;
+}
+
+// All edges with successors that aren't branches are "complex", because it
+// requires complex logic to pick which counter to update.
+GlobalVariable *GCOVProfiler::buildEdgeLookupTable(
+ Function *F,
+ GlobalVariable *Counters,
+ const UniqueVector<BasicBlock *> &Preds,
+ const UniqueVector<BasicBlock *> &Succs) {
+ // TODO: support invoke, threads. We rely on the fact that nothing can modify
+ // the whole-Module pred edge# between the time we set it and the time we next
+ // 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, TableSize);
+
+ OwningArrayPtr<Constant *> EdgeTable(new Constant*[TableSize]);
+ Constant *NullValue = Constant::getNullValue(Int64PtrTy);
+ for (size_t i = 0; i != TableSize; ++i)
+ EdgeTable[i] = NullValue;
+
+ 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 > 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,
+ Edge + i);
+ EdgeTable[((Succs.idFor(Succ)-1) * Preds.size()) +
+ (Preds.idFor(BB)-1)] = cast<Constant>(Counter);
+ }
+ }
+ Edge += Successors;
+ }
- return true;
+ ArrayRef<Constant*> V(&EdgeTable[0], TableSize);
+ GlobalVariable *EdgeTableGV =
+ new GlobalVariable(
+ *M, EdgeTableTy, true, GlobalValue::InternalLinkage,
+ ConstantArray::get(EdgeTableTy, V),
+ "__llvm_gcda_edge_table");
+ EdgeTableGV->setUnnamedAddr(true);
+ return EdgeTableGV;
}
Constant *GCOVProfiler::getStartFileFunc() {
- const Type *Args[1] = { Type::getInt8PtrTy(*Ctx) };
- const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
- Args, false);
- return Mod->getOrInsertFunction("llvm_gcda_start_file", FTy);
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
+ Type::getInt8PtrTy(*Ctx), false);
+ return M->getOrInsertFunction("llvm_gcda_start_file", FTy);
+}
+
+Constant *GCOVProfiler::getIncrementIndirectCounterFunc() {
+ Type *Int32Ty = Type::getInt32Ty(*Ctx);
+ Type *Int64Ty = Type::getInt64Ty(*Ctx);
+ 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() {
- const Type *Args[1] = { Type::getInt32Ty(*Ctx) };
- const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
- Args, false);
- return Mod->getOrInsertFunction("llvm_gcda_emit_function", FTy);
+ Type *Args[2] = {
+ Type::getInt32Ty(*Ctx), // uint32_t ident
+ Type::getInt8PtrTy(*Ctx), // const char *function_name
+ };
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
+ return M->getOrInsertFunction("llvm_gcda_emit_function", FTy);
}
Constant *GCOVProfiler::getEmitArcsFunc() {
- const Type *Args[] = {
+ Type *Args[] = {
Type::getInt32Ty(*Ctx), // uint32_t num_counters
Type::getInt64PtrTy(*Ctx), // uint64_t *counters
};
- const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
Args, false);
- return Mod->getOrInsertFunction("llvm_gcda_emit_arcs", FTy);
+ return M->getOrInsertFunction("llvm_gcda_emit_arcs", FTy);
}
Constant *GCOVProfiler::getEndFileFunc() {
- const FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
- return Mod->getOrInsertFunction("llvm_gcda_end_file", FTy);
+ FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
+ return M->getOrInsertFunction("llvm_gcda_end_file", FTy);
}
-static std::string ReplaceStem(std::string orig_filename, std::string new_stem){
- return (sys::path::stem(orig_filename) + "." + new_stem).str();
+GlobalVariable *GCOVProfiler::getEdgeStateValue() {
+ GlobalVariable *GV = M->getGlobalVariable("__llvm_gcov_global_state_pred");
+ if (!GV) {
+ GV = new GlobalVariable(*M, Type::getInt32Ty(*Ctx), false,
+ GlobalValue::InternalLinkage,
+ ConstantInt::get(Type::getInt32Ty(*Ctx),
+ 0xffffffff),
+ "__llvm_gcov_global_state_pred");
+ GV->setUnnamedAddr(true);
+ }
+ return GV;
}
-void GCOVProfiler::InsertCounterWriteout(
- DebugInfoFinder &DIF,
- SmallVector<std::pair<GlobalVariable *, uint32_t>, 8> &counters_by_ident) {
-
- const FunctionType *WriteoutFTy =
- FunctionType::get(Type::getVoidTy(*Ctx), false);
- Function *WriteoutF = Function::Create(WriteoutFTy,
- GlobalValue::InternalLinkage,
- "__llvm_gcda_writeout", Mod);
+void 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);
- IRBuilder<> builder(BB);
+ WriteoutF->addFnAttr(Attributes::NoInline);
+ if (NoRedZone)
+ WriteoutF->addFnAttr(Attributes::NoRedZone);
+
+ BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", WriteoutF);
+ IRBuilder<> Builder(BB);
Constant *StartFile = getStartFileFunc();
Constant *EmitFunction = getEmitFunctionFunc();
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 filename_gcda = ReplaceStem(compile_unit.getFilename(), "gcda");
- builder.CreateCall(StartFile,
- builder.CreateGlobalStringPtr(filename_gcda));
- for (SmallVector<std::pair<GlobalVariable *, uint32_t>, 8>::iterator
- I = counters_by_ident.begin(), E = counters_by_ident.end();
- I != E; ++I) {
- builder.CreateCall(EmitFunction, ConstantInt::get(Type::getInt32Ty(*Ctx),
- I->second));
- GlobalVariable *GV = I->first;
- unsigned num_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.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;
+ unsigned Arcs =
cast<ArrayType>(GV->getType()->getElementType())->getNumElements();
- builder.CreateCall2(
- EmitArcs,
- ConstantInt::get(Type::getInt32Ty(*Ctx), num_arcs),
- builder.CreateConstGEP2_64(GV, 0, 0));
+ Builder.CreateCall2(EmitArcs,
+ ConstantInt::get(Type::getInt32Ty(*Ctx), Arcs),
+ Builder.CreateConstGEP2_64(GV, 0, 0));
+ }
+ Builder.CreateCall(EndFile);
}
- builder.CreateCall(EndFile);
}
- builder.CreateRetVoid();
+ 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(Attributes::NoInline);
+ if (NoRedZone)
+ F->addFnAttr(Attributes::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);
+}
+
+void GCOVProfiler::insertIndirectCounterIncrement() {
+ Function *Fn =
+ cast<Function>(GCOVProfiler::getIncrementIndirectCounterFunc());
+ Fn->setUnnamedAddr(true);
+ Fn->setLinkage(GlobalValue::InternalLinkage);
+ Fn->addFnAttr(Attributes::NoInline);
+ if (NoRedZone)
+ Fn->addFnAttr(Attributes::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);
+
+ 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);
+ FlushF->addFnAttr(Attributes::NoInline);
+ if (NoRedZone)
+ FlushF->addFnAttr(Attributes::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);
+ }
- InsertProfilingShutdownCall(WriteoutF, Mod);
+ 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");
}
projects / oota-llvm.git / blobdiff