| //===- llvm/Analysis/ProfileInfo.h - Profile Info Interface -----*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file 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 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 |