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ebbc0e9bbf
which case you'll get a null array and zero passed to the profiling function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13336 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
4.3 KiB
C++
109 lines
4.3 KiB
C++
//===- ProfilingUtils.cpp - Helper functions shared by profilers ----------===//
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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 files implements a few helper functions which are used by profile
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// instrumentation code to instrument the code. This allows the profiler pass
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// to worry about *what* to insert, and these functions take care of *how* to do
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// it.
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//
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//===----------------------------------------------------------------------===//
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#include "ProfilingUtils.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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void llvm::InsertProfilingInitCall(Function *MainFn, const char *FnName,
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GlobalValue *Array) {
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const Type *ArgVTy = PointerType::get(PointerType::get(Type::SByteTy));
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const PointerType *UIntPtr = PointerType::get(Type::UIntTy);
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Module &M = *MainFn->getParent();
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Function *InitFn = M.getOrInsertFunction(FnName, Type::IntTy, Type::IntTy,
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ArgVTy, UIntPtr, Type::UIntTy, 0);
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// This could force argc and argv into programs that wouldn't otherwise have
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// them, but instead we just pass null values in.
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std::vector<Value*> Args(4);
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Args[0] = Constant::getNullValue(Type::IntTy);
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Args[1] = Constant::getNullValue(ArgVTy);
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// Skip over any allocas in the entry block.
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BasicBlock *Entry = MainFn->begin();
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BasicBlock::iterator InsertPos = Entry->begin();
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while (isa<AllocaInst>(InsertPos)) ++InsertPos;
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std::vector<Constant*> GEPIndices(2, Constant::getNullValue(Type::IntTy));
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unsigned NumElements = 0;
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if (Array) {
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ConstantPointerRef *ArrayCPR = ConstantPointerRef::get(Array);
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Args[2] = ConstantExpr::getGetElementPtr(ArrayCPR, GEPIndices);
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NumElements =
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cast<ArrayType>(Array->getType()->getElementType())->getNumElements();
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} else {
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// If this profiling instrumentation doesn't have a constant array, just
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// pass null.
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Args[2] = ConstantPointerNull::get(UIntPtr);
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}
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Args[3] = ConstantUInt::get(Type::UIntTy, NumElements);
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Instruction *InitCall = new CallInst(InitFn, Args, "newargc", InsertPos);
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// If argc or argv are not available in main, just pass null values in.
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Function::aiterator AI;
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switch (MainFn->asize()) {
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default:
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case 2:
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AI = MainFn->abegin(); ++AI;
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if (AI->getType() != ArgVTy) {
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InitCall->setOperand(2, new CastInst(AI, ArgVTy, "argv.cast", InitCall));
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} else {
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InitCall->setOperand(2, AI);
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}
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case 1:
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AI = MainFn->abegin();
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// If the program looked at argc, have it look at the return value of the
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// init call instead.
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if (AI->getType() != Type::IntTy) {
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if (!AI->use_empty())
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AI->replaceAllUsesWith(new CastInst(InitCall, AI->getType(), "",
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InsertPos));
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InitCall->setOperand(1, new CastInst(AI, Type::IntTy, "argc.cast",
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InitCall));
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} else {
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AI->replaceAllUsesWith(InitCall);
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InitCall->setOperand(1, AI);
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}
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case 0: break;
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}
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}
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void llvm::IncrementCounterInBlock(BasicBlock *BB, unsigned CounterNum,
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ConstantPointerRef *CounterArray) {
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// Insert the increment 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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// Create the getelementptr constant expression
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std::vector<Constant*> Indices(2);
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Indices[0] = Constant::getNullValue(Type::IntTy);
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Indices[1] = ConstantSInt::get(Type::IntTy, CounterNum);
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Constant *ElementPtr = ConstantExpr::getGetElementPtr(CounterArray, Indices);
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// Load, increment and store the value back.
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Value *OldVal = new LoadInst(ElementPtr, "OldFuncCounter", InsertPos);
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Value *NewVal = BinaryOperator::create(Instruction::Add, OldVal,
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ConstantInt::get(Type::UIntTy, 1),
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"NewFuncCounter", InsertPos);
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new StoreInst(NewVal, ElementPtr, InsertPos);
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}
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