EdgeBundles.h revision 234353
1218885Sdim//===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===// 2218885Sdim// 3218885Sdim// The LLVM Compiler Infrastructure 4218885Sdim// 5218885Sdim// This file is distributed under the University of Illinois Open Source 6218885Sdim// License. See LICENSE.TXT for details. 7218885Sdim// 8218885Sdim//===----------------------------------------------------------------------===// 9218885Sdim// 10218885Sdim// The EdgeBundles analysis forms equivalence classes of CFG edges such that all 11218885Sdim// edges leaving a machine basic block are in the same bundle, and all edges 12218885Sdim// leaving a basic block are in the same bundle. 13218885Sdim// 14218885Sdim//===----------------------------------------------------------------------===// 15218885Sdim 16218885Sdim#ifndef LLVM_CODEGEN_EDGEBUNDLES_H 17218885Sdim#define LLVM_CODEGEN_EDGEBUNDLES_H 18218885Sdim 19221345Sdim#include "llvm/ADT/ArrayRef.h" 20218885Sdim#include "llvm/ADT/IntEqClasses.h" 21234353Sdim#include "llvm/ADT/Twine.h" 22218885Sdim#include "llvm/CodeGen/MachineFunctionPass.h" 23218885Sdim 24218885Sdimnamespace llvm { 25218885Sdim 26218885Sdimclass EdgeBundles : public MachineFunctionPass { 27218885Sdim const MachineFunction *MF; 28218885Sdim 29218885Sdim /// EC - Each edge bundle is an equivalence class. The keys are: 30218885Sdim /// 2*BB->getNumber() -> Ingoing bundle. 31218885Sdim /// 2*BB->getNumber()+1 -> Outgoing bundle. 32218885Sdim IntEqClasses EC; 33218885Sdim 34221345Sdim /// Blocks - Map each bundle to a list of basic block numbers. 35221345Sdim SmallVector<SmallVector<unsigned, 8>, 4> Blocks; 36221345Sdim 37218885Sdimpublic: 38218885Sdim static char ID; 39218885Sdim EdgeBundles() : MachineFunctionPass(ID) {} 40218885Sdim 41218885Sdim /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 42218885Sdim /// bundle number for basic block #N 43218885Sdim unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; } 44218885Sdim 45218885Sdim /// getNumBundles - Return the total number of bundles in the CFG. 46218885Sdim unsigned getNumBundles() const { return EC.getNumClasses(); } 47218885Sdim 48221345Sdim /// getBlocks - Return an array of blocks that are connected to Bundle. 49221345Sdim ArrayRef<unsigned> getBlocks(unsigned Bundle) { return Blocks[Bundle]; } 50221345Sdim 51218885Sdim /// getMachineFunction - Return the last machine function computed. 52218885Sdim const MachineFunction *getMachineFunction() const { return MF; } 53218885Sdim 54218885Sdim /// view - Visualize the annotated bipartite CFG with Graphviz. 55218885Sdim void view() const; 56218885Sdim 57218885Sdimprivate: 58218885Sdim virtual bool runOnMachineFunction(MachineFunction&); 59218885Sdim virtual void getAnalysisUsage(AnalysisUsage&) const; 60218885Sdim}; 61218885Sdim 62218885Sdim/// Specialize WriteGraph, the standard implementation won't work. 63218885Sdimraw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G, 64218885Sdim bool ShortNames = false, 65234353Sdim const Twine &Title = ""); 66218885Sdim 67218885Sdim} // end namespace llvm 68218885Sdim 69218885Sdim#endif 70