EdgeBundles.h revision 218893
1//===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// The EdgeBundles analysis forms equivalence classes of CFG edges such that all 11// edges leaving a machine basic block are in the same bundle, and all edges 12// leaving a basic block are in the same bundle. 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef LLVM_CODEGEN_EDGEBUNDLES_H 17#define LLVM_CODEGEN_EDGEBUNDLES_H 18 19#include "llvm/ADT/IntEqClasses.h" 20#include "llvm/CodeGen/MachineFunctionPass.h" 21 22namespace llvm { 23 24class EdgeBundles : public MachineFunctionPass { 25 const MachineFunction *MF; 26 27 /// EC - Each edge bundle is an equivalence class. The keys are: 28 /// 2*BB->getNumber() -> Ingoing bundle. 29 /// 2*BB->getNumber()+1 -> Outgoing bundle. 30 IntEqClasses EC; 31 32public: 33 static char ID; 34 EdgeBundles() : MachineFunctionPass(ID) {} 35 36 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 37 /// bundle number for basic block #N 38 unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; } 39 40 /// getNumBundles - Return the total number of bundles in the CFG. 41 unsigned getNumBundles() const { return EC.getNumClasses(); } 42 43 /// getMachineFunction - Return the last machine function computed. 44 const MachineFunction *getMachineFunction() const { return MF; } 45 46 /// view - Visualize the annotated bipartite CFG with Graphviz. 47 void view() const; 48 49private: 50 virtual bool runOnMachineFunction(MachineFunction&); 51 virtual void getAnalysisUsage(AnalysisUsage&) const; 52}; 53 54/// Specialize WriteGraph, the standard implementation won't work. 55raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G, 56 bool ShortNames = false, 57 const std::string &Title = ""); 58 59} // end namespace llvm 60 61#endif 62