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use it instead of duplicating its functionality. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51499 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
4.7 KiB
C++
121 lines
4.7 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 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 file 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 =
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PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
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const PointerType *UIntPtr = PointerType::getUnqual(Type::Int32Ty);
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Module &M = *MainFn->getParent();
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Constant *InitFn = M.getOrInsertFunction(FnName, Type::Int32Ty, Type::Int32Ty,
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ArgVTy, UIntPtr, Type::Int32Ty,
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(Type *)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::Int32Ty);
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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::Int32Ty));
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unsigned NumElements = 0;
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if (Array) {
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Args[2] = ConstantExpr::getGetElementPtr(Array, &GEPIndices[0],
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GEPIndices.size());
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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] = ConstantInt::get(Type::Int32Ty, NumElements);
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Instruction *InitCall = CallInst::Create(InitFn, Args.begin(), Args.end(),
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"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::arg_iterator AI;
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switch (MainFn->arg_size()) {
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default:
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case 2:
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AI = MainFn->arg_begin(); ++AI;
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if (AI->getType() != ArgVTy) {
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Instruction::CastOps opcode = CastInst::getCastOpcode(AI, false, ArgVTy,
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false);
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InitCall->setOperand(2,
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CastInst::Create(opcode, 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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/* FALL THROUGH */
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case 1:
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AI = MainFn->arg_begin();
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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::Int32Ty) {
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Instruction::CastOps opcode;
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if (!AI->use_empty()) {
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opcode = CastInst::getCastOpcode(InitCall, true, AI->getType(), true);
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AI->replaceAllUsesWith(
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CastInst::Create(opcode, InitCall, AI->getType(), "", InsertPos));
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}
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opcode = CastInst::getCastOpcode(AI, true, Type::Int32Ty, true);
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InitCall->setOperand(1,
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CastInst::Create(opcode, AI, Type::Int32Ty, "argc.cast", 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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GlobalValue *CounterArray) {
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// Insert the increment after any alloca or PHI instructions...
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BasicBlock::iterator InsertPos = BB->getFirstNonPHI();
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while (isa<AllocaInst>(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::Int32Ty);
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Indices[1] = ConstantInt::get(Type::Int32Ty, CounterNum);
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Constant *ElementPtr =
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ConstantExpr::getGetElementPtr(CounterArray, &Indices[0], Indices.size());
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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::Int32Ty, 1),
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"NewFuncCounter", InsertPos);
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new StoreInst(NewVal, ElementPtr, InsertPos);
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}
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