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//===- TraceBasicBlocks.cpp - Insert basic-block trace instrumentation ----===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass instruments the specified program with calls into a runtime
// library that cause it to output a trace of basic blocks as a side effect
// of normal execution.
//
//===----------------------------------------------------------------------===//
#include "ProfilingUtils.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Instructions.h"
#include "llvm/Support/Debug.h"
#include <set>
using namespace llvm;
namespace {
class TraceBasicBlocks : public ModulePass {
bool runOnModule(Module &M);
};
RegisterPass<TraceBasicBlocks> X("trace-basic-blocks",
"Insert instrumentation for basic block tracing");
}
ModulePass *llvm::createTraceBasicBlockPass()
{
return new TraceBasicBlocks();
}
static void InsertInstrumentationCall (BasicBlock *BB,
const std::string FnName,
unsigned BBNumber) {
DOUT << "InsertInstrumentationCall (\"" << BB->getName ()
<< "\", \"" << FnName << "\", " << BBNumber << ")\n";
Module &M = *BB->getParent ()->getParent ();
Function *InstrFn = M.getOrInsertFunction (FnName, Type::VoidTy,
Type::UIntTy, (Type *)0);
std::vector<Value*> Args (1);
Args[0] = ConstantInt::get (Type::UIntTy, BBNumber);
// Insert the call after any alloca or PHI instructions...
BasicBlock::iterator InsertPos = BB->begin();
while (isa<AllocaInst>(InsertPos) || isa<PHINode>(InsertPos))
++InsertPos;
new CallInst (InstrFn, Args, "", InsertPos);
}
bool TraceBasicBlocks::runOnModule(Module &M) {
Function *Main = M.getMainFunction();
if (Main == 0) {
cerr << "WARNING: cannot insert basic-block trace instrumentation"
<< " into a module with no main function!\n";
return false; // No main, no instrumentation!
}
unsigned BBNumber = 0;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
InsertInstrumentationCall (BB, "llvm_trace_basic_block", BBNumber);
++BBNumber;
}
// Add the initialization call to main.
InsertProfilingInitCall(Main, "llvm_start_basic_block_tracing");
return true;
}
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