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/ADT/Twine.h" 22 #include "llvm/CodeGen/MachineFunctionPass.h" 23 24 namespace llvm { 25 26 class EdgeBundles : public MachineFunctionPass { 27 const MachineFunction *MF; 28 29 /// EC - Each edge bundle is an equivalence class. The keys are: 30 /// 2*BB->getNumber() -> Ingoing bundle. 31 /// 2*BB->getNumber()+1 -> Outgoing bundle. 32 IntEqClasses EC; 33 34 /// Blocks - Map each bundle to a list of basic block numbers. 35 SmallVector<SmallVector<unsigned, 8>, 4> Blocks; 36 37 public: 38 static char ID; 39 EdgeBundles() : MachineFunctionPass(ID) {} 40 41 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 42 /// bundle number for basic block #N 43 unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; } 44 45 /// getNumBundles - Return the total number of bundles in the CFG. 46 unsigned getNumBundles() const { return EC.getNumClasses(); } 47 48 /// getBlocks - Return an array of blocks that are connected to Bundle. 49 ArrayRef<unsigned> getBlocks(unsigned Bundle) const { return Blocks[Bundle]; } 50 51 /// getMachineFunction - Return the last machine function computed. 52 const MachineFunction *getMachineFunction() const { return MF; } 53 54 /// view - Visualize the annotated bipartite CFG with Graphviz. 55 void view() const; 56 57 private: 58 virtual bool runOnMachineFunction(MachineFunction&); 59 virtual void getAnalysisUsage(AnalysisUsage&) const; 60 }; 61 62 /// Specialize WriteGraph, the standard implementation won't work. 63 raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G, 64 bool ShortNames = false, 65 const Twine &Title = ""); 66 67 } // end namespace llvm 68 69 #endif 70
