1579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson/* 2579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Copyright (C) 2007 The Android Open Source Project 3579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 4579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Licensed under the Apache License, Version 2.0 (the "License"); 5579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * you may not use this file except in compliance with the License. 6579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * You may obtain a copy of the License at 7579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 8579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 9579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 10579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Unless required by applicable law or agreed to in writing, software 11579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 12579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * See the License for the specific language governing permissions and 14579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * limitations under the License. 15579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 16579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 17579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonpackage com.android.dx.ssa.back; 18579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 19579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.ssa.SsaMethod; 20579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.ssa.SsaBasicBlock; 21579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.ssa.SsaInsn; 22579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.ssa.PhiInsn; 23579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.ssa.SetFactory; 24579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.rop.code.RegisterSpec; 25579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.util.IntSet; 26579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.util.BitIntSet; 27579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport com.android.dx.util.ListIntSet; 28579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 29579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport java.util.BitSet; 30579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport java.util.List; 31579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonimport java.util.ArrayList; 32579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 33579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson/** 34579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * A register interference graph 35579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 36579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilsonpublic class InterferenceGraph { 37579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson /** 38579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * {@code non-null;} interference graph, indexed by register in 39579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * both dimensions 40579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 41579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson private final ArrayList<IntSet> interference; 42579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 43579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson /** 44579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Creates a new graph. 45579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 46579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * @param countRegs {@code >= 0;} the start count of registers in 47579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * the namespace. New registers can be added subsequently. 48579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 49579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson public InterferenceGraph(int countRegs) { 50579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson interference = new ArrayList<IntSet>(countRegs); 51579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 52579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson for (int i = 0; i < countRegs; i++) { 53579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson interference.add(SetFactory.makeInterferenceSet(countRegs)); 54579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 55579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 56579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 57579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson /** 58579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Adds a register pair to the interference/liveness graph. Parameter 59579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * order is insignificant. 60579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 61579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * @param regV one register index 62579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * @param regW another register index 63579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 64579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson public void add(int regV, int regW) { 65579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson ensureCapacity(Math.max(regV, regW) + 1); 66579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 67579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson interference.get(regV).add(regW); 68579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson interference.get(regW).add(regV); 69579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 70579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 71579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson /** 72579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Dumps interference graph to stdout for debugging. 73579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 74579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson public void dumpToStdout() { 75579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson int oldRegCount = interference.size(); 76579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 77579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson for (int i = 0; i < oldRegCount; i++) { 78579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson StringBuilder sb = new StringBuilder(); 79579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 80579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson sb.append("Reg " + i + ":" + interference.get(i).toString()); 81579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 82579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson System.out.println(sb.toString()); 83579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 84579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 85579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 86579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson /** 87579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Merges the interference set for a register into a given bit set 88579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 89579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * @param reg {@code >= 0;} register 90579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * @param set {@code non-null;} interference set; will be merged 91579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * with set for given register 92579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 93579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson public void mergeInterferenceSet(int reg, IntSet set) { 94579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson if (reg < interference.size()) { 95579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson set.merge(interference.get(reg)); 96579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 97579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 98579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 99579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson /** 100579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * Ensures that the interference graph is appropriately sized. 101579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * 102579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson * @param size requested minumum size 103579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson */ 104579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson private void ensureCapacity(int size) { 105579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson int countRegs = interference.size(); 106579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 107579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson interference.ensureCapacity(size); 108579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson 109579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson for (int i = countRegs; i < size; i++) { 110579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson interference.add(SetFactory.makeInterferenceSet(size)); 111579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 112579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson } 113579d7739c53a2707ad711a2d2cae46d7d782f06Jesse Wilson} 114