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//===- llvm/Analysis/ProfileInfo.h - Profile Info Interface -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the generic ProfileInfo interface, which is used as the
// common interface used by all clients of profiling information, and
// implemented either by making static guestimations, or by actually reading in
// profiling information gathered by running the program.
//
// Note that to be useful, all profile-based optimizations should preserve
// ProfileInfo, which requires that they notify it when changes to the CFG are
// made.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_PROFILEINFO_H
#define LLVM_ANALYSIS_PROFILEINFO_H
#include <string>
#include <map>
namespace llvm {
class BasicBlock;
class Pass;
/// ProfileInfo Class - This class holds and maintains edge profiling
/// information for some unit of code.
class ProfileInfo {
protected:
// EdgeCounts - Count the number of times a transition between two blocks is
// executed. As a special case, we also hold an edge from the null
// BasicBlock to the entry block to indicate how many times the function was
// entered.
std::map<std::pair<BasicBlock*, BasicBlock*>, unsigned> EdgeCounts;
public:
static const char ID; // Class identification, replacement for typeinfo
virtual ~ProfileInfo(); // We want to be subclassed
//===------------------------------------------------------------------===//
/// Profile Information Queries
///
unsigned getExecutionCount(BasicBlock *BB) const;
unsigned getEdgeWeight(BasicBlock *Src, BasicBlock *Dest) const {
std::map<std::pair<BasicBlock*, BasicBlock*>, unsigned>::const_iterator I=
EdgeCounts.find(std::make_pair(Src, Dest));
return I != EdgeCounts.end() ? I->second : 0;
}
//===------------------------------------------------------------------===//
/// Analysis Update Methods
///
};
/// createProfileLoaderPass - This function returns a Pass that loads the
/// profiling information for the module from the specified filename, making
/// it available to the optimizers.
Pass *createProfileLoaderPass(const std::string &Filename);
} // End llvm namespace
#endif
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