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66c5fd6c53
pointer marking the end of the list, the zero *must* be cast to the pointer type. An un-cast zero is a 32-bit int, and at least on x86_64, gcc will not extend the zero to 64 bits, thus allowing the upper 32 bits to be random junk. The new END_WITH_NULL macro may be used to annotate a such a function so that GCC (version 4 or newer) will detect the use of un-casted zero at compile time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23888 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
//===- TraceBasicBlocks.cpp - Insert basic-block trace instrumentation ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass instruments the specified program with calls into a runtime
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// library that cause it to output a trace of basic blocks as a side effect
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// of normal execution.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm/Instructions.h"
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#include "ProfilingUtils.h"
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#include "llvm/Support/Debug.h"
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#include <set>
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using namespace llvm;
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namespace {
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class TraceBasicBlocks : public ModulePass {
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bool runOnModule(Module &M);
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};
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RegisterOpt<TraceBasicBlocks> X("trace-basic-blocks",
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"Insert instrumentation for basic block tracing");
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}
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ModulePass *llvm::createTraceBasicBlockPass()
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{
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return new TraceBasicBlocks();
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}
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static void InsertInstrumentationCall (BasicBlock *BB,
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const std::string FnName,
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unsigned BBNumber) {
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DEBUG (std::cerr << "InsertInstrumentationCall (\"" << BB->getName ()
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<< "\", \"" << FnName << "\", " << BBNumber << ")\n");
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Module &M = *BB->getParent ()->getParent ();
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Function *InstrFn = M.getOrInsertFunction (FnName, Type::VoidTy,
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Type::UIntTy, (Type *)0);
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std::vector<Value*> Args (1);
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Args[0] = ConstantUInt::get (Type::UIntTy, BBNumber);
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// Insert the call after any alloca or PHI instructions...
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BasicBlock::iterator InsertPos = BB->begin();
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while (isa<AllocaInst>(InsertPos) || isa<PHINode>(InsertPos))
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++InsertPos;
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Instruction *InstrCall = new CallInst (InstrFn, Args, "", InsertPos);
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}
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bool TraceBasicBlocks::runOnModule(Module &M) {
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Function *Main = M.getMainFunction();
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if (Main == 0) {
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std::cerr << "WARNING: cannot insert basic-block trace instrumentation"
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<< " into a module with no main function!\n";
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return false; // No main, no instrumentation!
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}
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unsigned BBNumber = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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InsertInstrumentationCall (BB, "llvm_trace_basic_block", BBNumber);
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++BBNumber;
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}
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// Add the initialization call to main.
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InsertProfilingInitCall(Main, "llvm_start_basic_block_tracing");
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return true;
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}
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