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//===- ProfileInfo.cpp - Profile Info Interface ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the abstract ProfileInfo interface, and the default
// "no profile" implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Compiler.h"
#include <set>
using namespace llvm;
// Register the ProfileInfo interface, providing a nice name to refer to.
static RegisterAnalysisGroup<ProfileInfo> Z("Profile Information");
char ProfileInfo::ID = 0;
ProfileInfo::~ProfileInfo() {}
double ProfileInfo::getExecutionCount(const BasicBlock *BB) {
std::map<const Function*, BlockCounts>::iterator J =
BlockInformation.find(BB->getParent());
if (J != BlockInformation.end()) {
BlockCounts::iterator I = J->second.find(BB);
if (I != J->second.end())
return I->second;
}
pred_const_iterator PI = pred_begin(BB), PE = pred_end(BB);
// Are there zero predecessors of this block?
if (PI == PE) {
// If this is the entry block, look for the Null -> Entry edge.
if (BB == &BB->getParent()->getEntryBlock())
return getEdgeWeight(getEdge(0, BB));
else
return 0; // Otherwise, this is a dead block.
}
// Otherwise, if there are predecessors, the execution count of this block is
// the sum of the edge frequencies from the incoming edges.
std::set<const BasicBlock*> ProcessedPreds;
double Count = 0;
for (; PI != PE; ++PI)
if (ProcessedPreds.insert(*PI).second) {
double w = getEdgeWeight(getEdge(*PI, BB));
if (w == MissingValue) {
Count = MissingValue; break;
}
Count += w;
}
BlockInformation[BB->getParent()][BB] = Count;
return Count;
}
double ProfileInfo::getExecutionCount(const Function *F) {
if (F->isDeclaration()) return MissingValue;
std::map<const Function*, double>::iterator J =
FunctionInformation.find(F);
if (J != FunctionInformation.end())
return J->second;
double Count = getExecutionCount(&F->getEntryBlock());
FunctionInformation[F] = Count;
return Count;
}
//===----------------------------------------------------------------------===//
// NoProfile ProfileInfo implementation
//
namespace {
struct VISIBILITY_HIDDEN NoProfileInfo
: public ImmutablePass, public ProfileInfo {
static char ID; // Class identification, replacement for typeinfo
NoProfileInfo() : ImmutablePass(&ID) {}
};
} // End of anonymous namespace
char NoProfileInfo::ID = 0;
// Register this pass...
static RegisterPass<NoProfileInfo>
X("no-profile", "No Profile Information", false, true);
// Declare that we implement the ProfileInfo interface
static RegisterAnalysisGroup<ProfileInfo, true> Y(X);
ImmutablePass *llvm::createNoProfileInfoPass() { return new NoProfileInfo(); }
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