mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164040 91177308-0d34-0410-b5e6-96231b3b80d8
789 lines
27 KiB
C++
789 lines
27 KiB
C++
//===- GCOVProfiling.cpp - Insert edge counters for gcov profiling --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass implements GCOV-style profiling. When this pass is run it emits
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// "gcno" files next to the existing source, and instruments the code that runs
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// to records the edges between blocks that run and emit a complementary "gcda"
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// file on exit.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "insert-gcov-profiling"
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#include "ProfilingUtils.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm/DebugInfo.h"
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#include "llvm/IRBuilder.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/UniqueVector.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/DebugLoc.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Support/PathV2.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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#include <string>
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#include <utility>
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using namespace llvm;
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namespace {
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class GCOVProfiler : public ModulePass {
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public:
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static char ID;
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GCOVProfiler()
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: ModulePass(ID), EmitNotes(true), EmitData(true), Use402Format(false),
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UseExtraChecksum(false) {
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initializeGCOVProfilerPass(*PassRegistry::getPassRegistry());
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}
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GCOVProfiler(bool EmitNotes, bool EmitData, bool use402Format = false,
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bool useExtraChecksum = false)
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: ModulePass(ID), EmitNotes(EmitNotes), EmitData(EmitData),
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Use402Format(use402Format), UseExtraChecksum(useExtraChecksum) {
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assert((EmitNotes || EmitData) && "GCOVProfiler asked to do nothing?");
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initializeGCOVProfilerPass(*PassRegistry::getPassRegistry());
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}
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virtual const char *getPassName() const {
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return "GCOV Profiler";
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}
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private:
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bool runOnModule(Module &M);
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// Create the GCNO files for the Module based on DebugInfo.
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void emitGCNO();
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// Modify the program to track transitions along edges and call into the
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// profiling runtime to emit .gcda files when run.
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bool emitProfileArcs();
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// Get pointers to the functions in the runtime library.
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Constant *getStartFileFunc();
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Constant *getIncrementIndirectCounterFunc();
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Constant *getEmitFunctionFunc();
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Constant *getEmitArcsFunc();
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Constant *getEndFileFunc();
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// Create or retrieve an i32 state value that is used to represent the
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// pred block number for certain non-trivial edges.
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GlobalVariable *getEdgeStateValue();
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// Produce a table of pointers to counters, by predecessor and successor
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// block number.
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GlobalVariable *buildEdgeLookupTable(Function *F,
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GlobalVariable *Counter,
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const UniqueVector<BasicBlock *> &Preds,
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const UniqueVector<BasicBlock *> &Succs);
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// Add the function to write out all our counters to the global destructor
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// list.
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void insertCounterWriteout(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
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void insertIndirectCounterIncrement();
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void insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
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std::string mangleName(DICompileUnit CU, const char *NewStem);
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bool EmitNotes;
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bool EmitData;
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bool Use402Format;
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bool UseExtraChecksum;
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Module *M;
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LLVMContext *Ctx;
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};
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}
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char GCOVProfiler::ID = 0;
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INITIALIZE_PASS(GCOVProfiler, "insert-gcov-profiling",
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"Insert instrumentation for GCOV profiling", false, false)
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ModulePass *llvm::createGCOVProfilerPass(bool EmitNotes, bool EmitData,
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bool Use402Format,
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bool UseExtraChecksum) {
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return new GCOVProfiler(EmitNotes, EmitData, Use402Format, UseExtraChecksum);
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}
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namespace {
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class GCOVRecord {
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protected:
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static const char *LinesTag;
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static const char *FunctionTag;
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static const char *BlockTag;
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static const char *EdgeTag;
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GCOVRecord() {}
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void writeBytes(const char *Bytes, int Size) {
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os->write(Bytes, Size);
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}
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void write(uint32_t i) {
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writeBytes(reinterpret_cast<char*>(&i), 4);
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}
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// Returns the length measured in 4-byte blocks that will be used to
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// represent this string in a GCOV file
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unsigned lengthOfGCOVString(StringRef s) {
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// A GCOV string is a length, followed by a NUL, then between 0 and 3 NULs
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// padding out to the next 4-byte word. The length is measured in 4-byte
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// words including padding, not bytes of actual string.
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return (s.size() / 4) + 1;
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}
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void writeGCOVString(StringRef s) {
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uint32_t Len = lengthOfGCOVString(s);
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write(Len);
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writeBytes(s.data(), s.size());
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// Write 1 to 4 bytes of NUL padding.
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assert((unsigned)(4 - (s.size() % 4)) > 0);
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assert((unsigned)(4 - (s.size() % 4)) <= 4);
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writeBytes("\0\0\0\0", 4 - (s.size() % 4));
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}
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raw_ostream *os;
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};
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const char *GCOVRecord::LinesTag = "\0\0\x45\x01";
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const char *GCOVRecord::FunctionTag = "\0\0\0\1";
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const char *GCOVRecord::BlockTag = "\0\0\x41\x01";
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const char *GCOVRecord::EdgeTag = "\0\0\x43\x01";
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class GCOVFunction;
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class GCOVBlock;
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// Constructed only by requesting it from a GCOVBlock, this object stores a
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// list of line numbers and a single filename, representing lines that belong
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// to the block.
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class GCOVLines : public GCOVRecord {
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public:
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void addLine(uint32_t Line) {
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Lines.push_back(Line);
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}
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uint32_t length() {
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// Here 2 = 1 for string length + 1 for '0' id#.
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return lengthOfGCOVString(Filename) + 2 + Lines.size();
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}
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void writeOut() {
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write(0);
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writeGCOVString(Filename);
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for (int i = 0, e = Lines.size(); i != e; ++i)
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write(Lines[i]);
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}
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GCOVLines(StringRef F, raw_ostream *os)
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: Filename(F) {
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this->os = os;
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}
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private:
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StringRef Filename;
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SmallVector<uint32_t, 32> Lines;
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};
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// Represent a basic block in GCOV. Each block has a unique number in the
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// function, number of lines belonging to each block, and a set of edges to
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// other blocks.
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class GCOVBlock : public GCOVRecord {
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public:
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GCOVLines &getFile(StringRef Filename) {
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GCOVLines *&Lines = LinesByFile[Filename];
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if (!Lines) {
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Lines = new GCOVLines(Filename, os);
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}
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return *Lines;
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}
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void addEdge(GCOVBlock &Successor) {
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OutEdges.push_back(&Successor);
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}
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void writeOut() {
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uint32_t Len = 3;
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for (StringMap<GCOVLines *>::iterator I = LinesByFile.begin(),
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E = LinesByFile.end(); I != E; ++I) {
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Len += I->second->length();
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}
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writeBytes(LinesTag, 4);
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write(Len);
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write(Number);
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for (StringMap<GCOVLines *>::iterator I = LinesByFile.begin(),
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E = LinesByFile.end(); I != E; ++I)
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I->second->writeOut();
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write(0);
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write(0);
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}
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~GCOVBlock() {
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DeleteContainerSeconds(LinesByFile);
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}
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private:
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friend class GCOVFunction;
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GCOVBlock(uint32_t Number, raw_ostream *os)
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: Number(Number) {
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this->os = os;
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}
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uint32_t Number;
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StringMap<GCOVLines *> LinesByFile;
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SmallVector<GCOVBlock *, 4> OutEdges;
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};
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// A function has a unique identifier, a checksum (we leave as zero) and a
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// set of blocks and a map of edges between blocks. This is the only GCOV
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// object users can construct, the blocks and lines will be rooted here.
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class GCOVFunction : public GCOVRecord {
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public:
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GCOVFunction(DISubprogram SP, raw_ostream *os,
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bool Use402Format, bool UseExtraChecksum) {
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this->os = os;
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Function *F = SP.getFunction();
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DEBUG(dbgs() << "Function: " << F->getName() << "\n");
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uint32_t i = 0;
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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Blocks[BB] = new GCOVBlock(i++, os);
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}
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ReturnBlock = new GCOVBlock(i++, os);
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writeBytes(FunctionTag, 4);
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uint32_t BlockLen = 1 + 1 + 1 + lengthOfGCOVString(SP.getName()) +
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1 + lengthOfGCOVString(SP.getFilename()) + 1;
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if (UseExtraChecksum)
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++BlockLen;
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write(BlockLen);
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uint32_t Ident = reinterpret_cast<intptr_t>((MDNode*)SP);
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write(Ident);
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write(0); // lineno checksum
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if (UseExtraChecksum)
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write(0); // cfg checksum
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writeGCOVString(SP.getName());
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writeGCOVString(SP.getFilename());
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write(SP.getLineNumber());
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}
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~GCOVFunction() {
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DeleteContainerSeconds(Blocks);
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delete ReturnBlock;
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}
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GCOVBlock &getBlock(BasicBlock *BB) {
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return *Blocks[BB];
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}
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GCOVBlock &getReturnBlock() {
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return *ReturnBlock;
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}
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void writeOut() {
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// Emit count of blocks.
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writeBytes(BlockTag, 4);
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write(Blocks.size() + 1);
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for (int i = 0, e = Blocks.size() + 1; i != e; ++i) {
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write(0); // No flags on our blocks.
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}
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DEBUG(dbgs() << Blocks.size() << " blocks.\n");
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// Emit edges between blocks.
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for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = Blocks.begin(),
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E = Blocks.end(); I != E; ++I) {
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GCOVBlock &Block = *I->second;
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if (Block.OutEdges.empty()) continue;
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writeBytes(EdgeTag, 4);
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write(Block.OutEdges.size() * 2 + 1);
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write(Block.Number);
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for (int i = 0, e = Block.OutEdges.size(); i != e; ++i) {
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DEBUG(dbgs() << Block.Number << " -> " << Block.OutEdges[i]->Number
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<< "\n");
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write(Block.OutEdges[i]->Number);
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write(0); // no flags
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}
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}
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// Emit lines for each block.
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for (DenseMap<BasicBlock *, GCOVBlock *>::iterator I = Blocks.begin(),
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E = Blocks.end(); I != E; ++I) {
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I->second->writeOut();
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}
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}
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private:
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DenseMap<BasicBlock *, GCOVBlock *> Blocks;
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GCOVBlock *ReturnBlock;
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};
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}
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std::string GCOVProfiler::mangleName(DICompileUnit CU, const char *NewStem) {
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if (NamedMDNode *GCov = M->getNamedMetadata("llvm.gcov")) {
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for (int i = 0, e = GCov->getNumOperands(); i != e; ++i) {
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MDNode *N = GCov->getOperand(i);
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if (N->getNumOperands() != 2) continue;
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MDString *GCovFile = dyn_cast<MDString>(N->getOperand(0));
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MDNode *CompileUnit = dyn_cast<MDNode>(N->getOperand(1));
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if (!GCovFile || !CompileUnit) continue;
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if (CompileUnit == CU) {
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SmallString<128> Filename = GCovFile->getString();
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sys::path::replace_extension(Filename, NewStem);
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return Filename.str();
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}
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}
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}
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SmallString<128> Filename = CU.getFilename();
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sys::path::replace_extension(Filename, NewStem);
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return sys::path::filename(Filename.str());
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}
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bool GCOVProfiler::runOnModule(Module &M) {
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this->M = &M;
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Ctx = &M.getContext();
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if (EmitNotes) emitGCNO();
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if (EmitData) return emitProfileArcs();
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return false;
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}
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void GCOVProfiler::emitGCNO() {
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NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
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if (!CU_Nodes) return;
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for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
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// Each compile unit gets its own .gcno file. This means that whether we run
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// this pass over the original .o's as they're produced, or run it after
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// LTO, we'll generate the same .gcno files.
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DICompileUnit CU(CU_Nodes->getOperand(i));
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std::string ErrorInfo;
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raw_fd_ostream out(mangleName(CU, "gcno").c_str(), ErrorInfo,
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raw_fd_ostream::F_Binary);
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if (!Use402Format)
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out.write("oncg*404MVLL", 12);
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else
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out.write("oncg*204MVLL", 12);
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DIArray SPs = CU.getSubprograms();
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for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
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DISubprogram SP(SPs.getElement(i));
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if (!SP.Verify()) continue;
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Function *F = SP.getFunction();
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if (!F) continue;
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GCOVFunction Func(SP, &out, Use402Format, UseExtraChecksum);
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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GCOVBlock &Block = Func.getBlock(BB);
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TerminatorInst *TI = BB->getTerminator();
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if (int successors = TI->getNumSuccessors()) {
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for (int i = 0; i != successors; ++i) {
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Block.addEdge(Func.getBlock(TI->getSuccessor(i)));
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}
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} else if (isa<ReturnInst>(TI)) {
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Block.addEdge(Func.getReturnBlock());
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}
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uint32_t Line = 0;
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for (BasicBlock::iterator I = BB->begin(), IE = BB->end();
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I != IE; ++I) {
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const DebugLoc &Loc = I->getDebugLoc();
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if (Loc.isUnknown()) continue;
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if (Line == Loc.getLine()) continue;
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Line = Loc.getLine();
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if (SP != getDISubprogram(Loc.getScope(*Ctx))) continue;
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GCOVLines &Lines = Block.getFile(SP.getFilename());
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Lines.addLine(Loc.getLine());
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}
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}
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Func.writeOut();
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}
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out.write("\0\0\0\0\0\0\0\0", 8); // EOF
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out.close();
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}
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}
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bool GCOVProfiler::emitProfileArcs() {
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NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
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if (!CU_Nodes) return false;
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bool Result = false;
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bool InsertIndCounterIncrCode = false;
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for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
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DICompileUnit CU(CU_Nodes->getOperand(i));
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DIArray SPs = CU.getSubprograms();
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SmallVector<std::pair<GlobalVariable *, MDNode *>, 8> CountersBySP;
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for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
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DISubprogram SP(SPs.getElement(i));
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if (!SP.Verify()) continue;
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Function *F = SP.getFunction();
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if (!F) continue;
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if (!Result) Result = true;
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unsigned Edges = 0;
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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TerminatorInst *TI = BB->getTerminator();
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if (isa<ReturnInst>(TI))
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++Edges;
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else
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Edges += TI->getNumSuccessors();
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}
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ArrayType *CounterTy =
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ArrayType::get(Type::getInt64Ty(*Ctx), Edges);
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GlobalVariable *Counters =
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new GlobalVariable(*M, CounterTy, false,
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GlobalValue::InternalLinkage,
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Constant::getNullValue(CounterTy),
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"__llvm_gcov_ctr");
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CountersBySP.push_back(std::make_pair(Counters, (MDNode*)SP));
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UniqueVector<BasicBlock *> ComplexEdgePreds;
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UniqueVector<BasicBlock *> ComplexEdgeSuccs;
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unsigned Edge = 0;
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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TerminatorInst *TI = BB->getTerminator();
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int Successors = isa<ReturnInst>(TI) ? 1 : TI->getNumSuccessors();
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if (Successors) {
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IRBuilder<> Builder(TI);
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if (Successors == 1) {
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Value *Counter = Builder.CreateConstInBoundsGEP2_64(Counters, 0,
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Edge);
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Value *Count = Builder.CreateLoad(Counter);
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Count = Builder.CreateAdd(Count,
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ConstantInt::get(Type::getInt64Ty(*Ctx),1));
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Builder.CreateStore(Count, Counter);
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} else if (BranchInst *BI = dyn_cast<BranchInst>(TI)) {
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Value *Sel = Builder.CreateSelect(
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BI->getCondition(),
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ConstantInt::get(Type::getInt64Ty(*Ctx), Edge),
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ConstantInt::get(Type::getInt64Ty(*Ctx), Edge + 1));
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SmallVector<Value *, 2> Idx;
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Idx.push_back(Constant::getNullValue(Type::getInt64Ty(*Ctx)));
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Idx.push_back(Sel);
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Value *Counter = Builder.CreateInBoundsGEP(Counters, Idx);
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Value *Count = Builder.CreateLoad(Counter);
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Count = Builder.CreateAdd(Count,
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ConstantInt::get(Type::getInt64Ty(*Ctx),1));
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Builder.CreateStore(Count, Counter);
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} else {
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ComplexEdgePreds.insert(BB);
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for (int i = 0; i != Successors; ++i)
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|
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);
|
|
}
|
|
|
|
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*]].
|
|
Type *Int64PtrTy = Type::getInt64PtrTy(*Ctx);
|
|
ArrayType *EdgeTableTy = ArrayType::get(
|
|
Int64PtrTy, Succs.size() * Preds.size());
|
|
|
|
Constant **EdgeTable = new Constant*[Succs.size() * Preds.size()];
|
|
Constant *NullValue = Constant::getNullValue(Int64PtrTy);
|
|
for (int i = 0, ie = Succs.size() * Preds.size(); i != ie; ++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;
|
|
}
|
|
|
|
ArrayRef<Constant*> V(&EdgeTable[0], Succs.size() * Preds.size());
|
|
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() {
|
|
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() {
|
|
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() {
|
|
Type *Args[] = {
|
|
Type::getInt32Ty(*Ctx), // uint32_t num_counters
|
|
Type::getInt64PtrTy(*Ctx), // uint64_t *counters
|
|
};
|
|
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx),
|
|
Args, false);
|
|
return M->getOrInsertFunction("llvm_gcda_emit_arcs", FTy);
|
|
}
|
|
|
|
Constant *GCOVProfiler::getEndFileFunc() {
|
|
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
|
|
return M->getOrInsertFunction("llvm_gcda_end_file", FTy);
|
|
}
|
|
|
|
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(
|
|
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, "entry", WriteoutF);
|
|
IRBuilder<> Builder(BB);
|
|
|
|
Constant *StartFile = getStartFileFunc();
|
|
Constant *EmitFunction = getEmitFunctionFunc();
|
|
Constant *EmitArcs = getEmitArcsFunc();
|
|
Constant *EndFile = getEndFileFunc();
|
|
|
|
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), 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);
|
|
|
|
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(Attribute::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");
|
|
}
|