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Refactor code, initial implementation of -insert-block-profiling pass

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9593 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-10-29 21:24:22 +00:00
parent 05b958d363
commit 942457564d
1 changed files with 106 additions and 64 deletions
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170
lib/Transforms/Instrumentation/BlockProfiling.cpp
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@ -25,70 +25,8 @@
#include "llvm/Module.h"
#include "llvm/Pass.h"
namespace {
class FunctionProfiler : public Pass {
bool run(Module &M);
void insertInitializationCall(Function *MainFn, const char *FnName,
GlobalValue *Array);
};
RegisterOpt<FunctionProfiler> X("insert-function-profiling",
"Insert instrumentation for function profiling");
}
bool FunctionProfiler::run(Module &M) {
Function *Main = M.getMainFunction();
if (Main == 0) {
std::cerr << "WARNING: cannot insert function profiling into a module"
<< " with no main function!\n";
return false; // No main, no instrumentation!
}
unsigned NumFunctions = 0;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isExternal())
++NumFunctions;
const Type *ATy = ArrayType::get(Type::UIntTy, NumFunctions);
GlobalVariable *Counters =
new GlobalVariable(ATy, false, GlobalValue::InternalLinkage,
Constant::getNullValue(ATy), "FuncProfCounters", &M);
ConstantPointerRef *CounterCPR = ConstantPointerRef::get(Counters);
std::vector<Constant*> GEPIndices;
GEPIndices.resize(2);
GEPIndices[0] = Constant::getNullValue(Type::LongTy);
// Instrument all of the functions...
unsigned i = 0;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isExternal()) {
// Insert counter at the start of the function, but after any allocas.
BasicBlock *Entry = I->begin();
BasicBlock::iterator InsertPos = Entry->begin();
while (isa<AllocaInst>(InsertPos)) ++InsertPos;
GEPIndices[1] = ConstantSInt::get(Type::LongTy, i++);
Constant *ElementPtr =
ConstantExpr::getGetElementPtr(CounterCPR, GEPIndices);
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);
}
// Add the initialization call to main.
insertInitializationCall(Main, "llvm_start_func_profiling", Counters);
return true;
}
void FunctionProfiler::insertInitializationCall(Function *MainFn,
const char *FnName,
GlobalValue *Array) {
static void insertInitializationCall(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();
@ -139,3 +77,107 @@ void FunctionProfiler::insertInitializationCall(Function *MainFn,
new CallInst(InitFn, Args, "", InsertPos);
}
static void 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);
}
namespace {
class FunctionProfiler : public Pass {
bool run(Module &M);
};
RegisterOpt<FunctionProfiler> X("insert-function-profiling",
"Insert instrumentation for function profiling");
}
bool FunctionProfiler::run(Module &M) {
Function *Main = M.getMainFunction();
if (Main == 0) {
std::cerr << "WARNING: cannot insert function profiling into a module"
<< " with no main function!\n";
return false; // No main, no instrumentation!
}
unsigned NumFunctions = 0;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isExternal())
++NumFunctions;
const Type *ATy = ArrayType::get(Type::UIntTy, NumFunctions);
GlobalVariable *Counters =
new GlobalVariable(ATy, false, GlobalValue::InternalLinkage,
Constant::getNullValue(ATy), "FuncProfCounters", &M);
ConstantPointerRef *CounterCPR = ConstantPointerRef::get(Counters);
// Instrument all of the functions...
unsigned i = 0;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isExternal())
// Insert counter at the start of the function
IncrementCounterInBlock(I->begin(), i++, CounterCPR);
// Add the initialization call to main.
insertInitializationCall(Main, "llvm_start_func_profiling", Counters);
return true;
}
namespace {
class BlockProfiler : public Pass {
bool run(Module &M);
};
RegisterOpt<BlockProfiler> Y("insert-block-profiling",
"Insert instrumentation for block profiling");
}
bool BlockProfiler::run(Module &M) {
Function *Main = M.getMainFunction();
if (Main == 0) {
std::cerr << "WARNING: cannot insert block profiling into a module"
<< " with no main function!\n";
return false; // No main, no instrumentation!
}
unsigned NumBlocks = 0;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
NumBlocks += I->size();
const Type *ATy = ArrayType::get(Type::UIntTy, NumBlocks);
GlobalVariable *Counters =
new GlobalVariable(ATy, false, GlobalValue::InternalLinkage,
Constant::getNullValue(ATy), "BlockProfCounters", &M);
ConstantPointerRef *CounterCPR = ConstantPointerRef::get(Counters);
// Instrument all of the blocks...
unsigned i = 0;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
for (Function::iterator BB = I->begin(), E = I->end(); BB != E; ++BB)
// Insert counter at the start of the block
IncrementCounterInBlock(BB, i++, CounterCPR);
// Add the initialization call to main.
insertInitializationCall(Main, "llvm_start_block_profiling", Counters);
return true;
}