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-rw-r--r--lib/Transforms/Instrumentation/BlockProfiling.cpp128
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diff --git a/lib/Transforms/Instrumentation/BlockProfiling.cpp b/lib/Transforms/Instrumentation/BlockProfiling.cpp
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-//===- BlockProfiling.cpp - Insert counters for block profiling -----------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass instruments the specified program with counters for basic block or
-// function profiling. This is the most basic form of profiling, which can tell
-// which blocks are hot, but cannot reliably detect hot paths through the CFG.
-// Block profiling counts the number of times each basic block executes, and
-// function profiling counts the number of times each function is called.
-//
-// Note that this implementation is very naive. Control equivalent regions of
-// the CFG should not require duplicate counters, but we do put duplicate
-// counters in.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/DerivedTypes.h"
-#include "llvm/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/Instrumentation.h"
-#include "RSProfiling.h"
-#include "ProfilingUtils.h"
-using namespace llvm;
-
-namespace {
- class FunctionProfiler : public RSProfilers_std {
- public:
- static char ID;
- bool runOnModule(Module &M);
- };
-}
-
-char FunctionProfiler::ID = 0;
-
-static RegisterPass<FunctionProfiler>
-X("insert-function-profiling",
- "Insert instrumentation for function profiling");
-static RegisterAnalysisGroup<RSProfilers> XG(X);
-
-ModulePass *llvm::createFunctionProfilerPass() {
- return new FunctionProfiler();
-}
-
-bool FunctionProfiler::runOnModule(Module &M) {
- Function *Main = M.getFunction("main");
- if (Main == 0) {
- errs() << "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->isDeclaration())
- ++NumFunctions;
-
- const Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()),
- NumFunctions);
- GlobalVariable *Counters =
- new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
- Constant::getNullValue(ATy), "FuncProfCounters");
-
- // Instrument all of the functions...
- unsigned i = 0;
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- if (!I->isDeclaration())
- // Insert counter at the start of the function
- IncrementCounterInBlock(&I->getEntryBlock(), i++, Counters);
-
- // Add the initialization call to main.
- InsertProfilingInitCall(Main, "llvm_start_func_profiling", Counters);
- return true;
-}
-
-
-namespace {
- class BlockProfiler : public RSProfilers_std {
- bool runOnModule(Module &M);
- public:
- static char ID;
- };
-}
-
-char BlockProfiler::ID = 0;
-static RegisterPass<BlockProfiler>
-Y("insert-block-profiling", "Insert instrumentation for block profiling");
-static RegisterAnalysisGroup<RSProfilers> YG(Y);
-
-ModulePass *llvm::createBlockProfilerPass() { return new BlockProfiler(); }
-
-bool BlockProfiler::runOnModule(Module &M) {
- Function *Main = M.getFunction("main");
- if (Main == 0) {
- errs() << "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)
- if (!I->isDeclaration())
- NumBlocks += I->size();
-
- const Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()), NumBlocks);
- GlobalVariable *Counters =
- new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
- Constant::getNullValue(ATy), "BlockProfCounters");
-
- // Instrument all of the blocks...
- unsigned i = 0;
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
- if (I->isDeclaration()) continue;
- for (Function::iterator BB = I->begin(), E = I->end(); BB != E; ++BB)
- // Insert counter at the start of the block
- IncrementCounterInBlock(BB, i++, Counters);
- }
-
- // Add the initialization call to main.
- InsertProfilingInitCall(Main, "llvm_start_block_profiling", Counters);
- return true;
-}
-
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