1 //===- llvm/Analysis/ProfileInfo.h - Profile Info Interface -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the generic ProfileInfo interface, which is used as the
11 // common interface used by all clients of profiling information, and
12 // implemented either by making static guestimations, or by actually reading in
13 // profiling information gathered by running the program.
15 // Note that to be useful, all profile-based optimizations should preserve
16 // ProfileInfo, which requires that they notify it when changes to the CFG are
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_ANALYSIS_PROFILEINFO_H
22 #define LLVM_ANALYSIS_PROFILEINFO_H
31 /// ProfileInfo Class - This class holds and maintains edge profiling
32 /// information for some unit of code.
35 // EdgeCounts - Count the number of times a transition between two blocks is
36 // executed. As a special case, we also hold an edge from the null
37 // BasicBlock to the entry block to indicate how many times the function was
39 std::map<std::pair<BasicBlock*, BasicBlock*>, unsigned> EdgeCounts;
41 virtual ~ProfileInfo(); // We want to be subclassed
43 //===------------------------------------------------------------------===//
44 /// Profile Information Queries
46 unsigned getExecutionCount(BasicBlock *BB) const;
48 unsigned getEdgeWeight(BasicBlock *Src, BasicBlock *Dest) const {
49 std::map<std::pair<BasicBlock*, BasicBlock*>, unsigned>::const_iterator I=
50 EdgeCounts.find(std::make_pair(Src, Dest));
51 return I != EdgeCounts.end() ? I->second : 0;
54 //===------------------------------------------------------------------===//
55 /// Analysis Update Methods
60 /// createProfileLoaderPass - This function returns a Pass that loads the
61 /// profiling information for the module from the specified filename, making
62 /// it available to the optimizers.
63 Pass *createProfileLoaderPass(const std::string &Filename);
64 } // End llvm namespace