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