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