1 //===- llvm/Analysis/ProfileInfo.h - Profile Info Interface -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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
17 // made. (This is not implemented yet.)
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_ANALYSIS_PROFILEINFO_H
22 #define LLVM_ANALYSIS_PROFILEINFO_H
24 #include "llvm/BasicBlock.h"
33 /// ProfileInfo Class - This class holds and maintains profiling
34 /// information for some unit of code.
37 // Types for handling profiling information.
38 typedef std::pair<const BasicBlock*, const BasicBlock*> Edge;
39 typedef std::pair<Edge, double> EdgeWeight;
40 typedef std::map<Edge, double> EdgeWeights;
41 typedef std::map<const BasicBlock*, double> BlockCounts;
44 // EdgeInformation - Count the number of times a transition between two
45 // blocks is executed. As a special case, we also hold an edge from the
46 // null BasicBlock to the entry block to indicate how many times the
47 // function was entered.
48 std::map<const Function*, EdgeWeights> EdgeInformation;
50 // BlockInformation - Count the number of times a block is executed.
51 std::map<const Function*, BlockCounts> BlockInformation;
53 // FunctionInformation - Count the number of times a function is executed.
54 std::map<const Function*, double> FunctionInformation;
56 static char ID; // Class identification, replacement for typeinfo
57 virtual ~ProfileInfo(); // We want to be subclassed
59 // MissingValue - The value that is returned for execution counts in case
60 // no value is available.
61 static const double MissingValue;
63 // getFunction() - Returns the Function for an Edge, checking for validity.
64 static const Function* getFunction(Edge e) {
65 assert(e.second && "Invalid ProfileInfo::Edge");
66 return e.second->getParent();
69 // getEdge() - Creates an Edge from two BasicBlocks.
70 static Edge getEdge(const BasicBlock *Src, const BasicBlock *Dest) {
71 return std::make_pair(Src, Dest);
74 //===------------------------------------------------------------------===//
75 /// Profile Information Queries
77 double getExecutionCount(const Function *F);
79 double getExecutionCount(const BasicBlock *BB);
81 double getEdgeWeight(Edge e) const {
82 std::map<const Function*, EdgeWeights>::const_iterator J =
83 EdgeInformation.find(getFunction(e));
84 if (J == EdgeInformation.end()) return MissingValue;
86 EdgeWeights::const_iterator I = J->second.find(e);
87 if (I == J->second.end()) return MissingValue;
92 EdgeWeights &getEdgeWeights (const Function *F) {
93 return EdgeInformation[F];
96 //===------------------------------------------------------------------===//
97 /// Analysis Update Methods
102 /// createProfileLoaderPass - This function returns a Pass that loads the
103 /// profiling information for the module from the specified filename, making
104 /// it available to the optimizers.
105 Pass *createProfileLoaderPass(const std::string &Filename);
106 } // End llvm namespace