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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79852 91177308-0d34-0410-b5e6-96231b3b80d8
130 lines
4.3 KiB
C++
130 lines
4.3 KiB
C++
//===- BlockProfiling.cpp - Insert counters for block profiling -----------===//
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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 pass instruments the specified program with counters for basic block or
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// function profiling. This is the most basic form of profiling, which can tell
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// which blocks are hot, but cannot reliably detect hot paths through the CFG.
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// Block profiling counts the number of times each basic block executes, and
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// function profiling counts the number of times each function is called.
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//
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// Note that this implementation is very naive. Control equivalent regions of
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// the CFG should not require duplicate counters, but we do put duplicate
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// counters in.
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//
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//===----------------------------------------------------------------------===//
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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/Support/Compiler.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "RSProfiling.h"
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#include "ProfilingUtils.h"
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN FunctionProfiler : public RSProfilers_std {
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public:
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static char ID;
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bool runOnModule(Module &M);
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};
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}
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char FunctionProfiler::ID = 0;
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static RegisterPass<FunctionProfiler>
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X("insert-function-profiling",
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"Insert instrumentation for function profiling");
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static RegisterAnalysisGroup<RSProfilers> XG(X);
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ModulePass *llvm::createFunctionProfilerPass() {
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return new FunctionProfiler();
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}
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bool FunctionProfiler::runOnModule(Module &M) {
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Function *Main = M.getFunction("main");
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if (Main == 0) {
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errs() << "WARNING: cannot insert function profiling into a module"
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<< " with no main function!\n";
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return false; // No main, no instrumentation!
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}
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unsigned NumFunctions = 0;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isDeclaration())
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++NumFunctions;
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const Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()),
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NumFunctions);
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GlobalVariable *Counters =
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new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
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Constant::getNullValue(ATy), "FuncProfCounters");
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// Instrument all of the functions...
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unsigned i = 0;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isDeclaration())
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// Insert counter at the start of the function
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IncrementCounterInBlock(&I->getEntryBlock(), i++, Counters);
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// Add the initialization call to main.
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InsertProfilingInitCall(Main, "llvm_start_func_profiling", Counters);
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return true;
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}
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namespace {
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class BlockProfiler : public RSProfilers_std {
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bool runOnModule(Module &M);
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public:
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static char ID;
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};
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}
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char BlockProfiler::ID = 0;
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static RegisterPass<BlockProfiler>
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Y("insert-block-profiling", "Insert instrumentation for block profiling");
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static RegisterAnalysisGroup<RSProfilers> YG(Y);
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ModulePass *llvm::createBlockProfilerPass() { return new BlockProfiler(); }
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bool BlockProfiler::runOnModule(Module &M) {
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Function *Main = M.getFunction("main");
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if (Main == 0) {
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errs() << "WARNING: cannot insert block profiling into a module"
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<< " with no main function!\n";
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return false; // No main, no instrumentation!
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}
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unsigned NumBlocks = 0;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isDeclaration())
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NumBlocks += I->size();
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const Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()), NumBlocks);
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GlobalVariable *Counters =
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new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
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Constant::getNullValue(ATy), "BlockProfCounters");
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// Instrument all of the blocks...
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unsigned i = 0;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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if (I->isDeclaration()) continue;
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for (Function::iterator BB = I->begin(), E = I->end(); BB != E; ++BB)
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// Insert counter at the start of the block
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IncrementCounterInBlock(BB, i++, Counters);
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}
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// Add the initialization call to main.
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InsertProfilingInitCall(Main, "llvm_start_block_profiling", Counters);
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return true;
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}
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