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/ArrayRef.h" 20 #include "llvm/ADT/IntEqClasses.h" 21 #include "llvm/CodeGen/MachineFunctionPass.h" 22 23 namespace llvm { 24 25 class EdgeBundles : public MachineFunctionPass { 26 const MachineFunction *MF; 27 28 /// EC - Each edge bundle is an equivalence class. The keys are: 29 /// 2*BB->getNumber() -> Ingoing bundle. 30 /// 2*BB->getNumber()+1 -> Outgoing bundle. 31 IntEqClasses EC; 32 33 /// Blocks - Map each bundle to a list of basic block numbers. 34 SmallVector<SmallVector<unsigned, 8>, 4> Blocks; 35 36 public: 37 static char ID; EdgeBundles()38 EdgeBundles() : MachineFunctionPass(ID) {} 39 40 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 41 /// bundle number for basic block #N getBundle(unsigned N,bool Out)42 unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; } 43 44 /// getNumBundles - Return the total number of bundles in the CFG. getNumBundles()45 unsigned getNumBundles() const { return EC.getNumClasses(); } 46 47 /// getBlocks - Return an array of blocks that are connected to Bundle. getBlocks(unsigned Bundle)48 ArrayRef<unsigned> getBlocks(unsigned Bundle) { return Blocks[Bundle]; } 49 50 /// getMachineFunction - Return the last machine function computed. getMachineFunction()51 const MachineFunction *getMachineFunction() const { return MF; } 52 53 /// view - Visualize the annotated bipartite CFG with Graphviz. 54 void view() const; 55 56 private: 57 virtual bool runOnMachineFunction(MachineFunction&); 58 virtual void getAnalysisUsage(AnalysisUsage&) const; 59 }; 60 61 /// Specialize WriteGraph, the standard implementation won't work. 62 raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G, 63 bool ShortNames = false, 64 const std::string &Title = ""); 65 66 } // end namespace llvm 67 68 #endif 69