Mercurial > hg > graal-compiler

annotate graal/GraalCompiler/src/com/sun/c1x/alloc/LIRInsertionBuffer.java @ 2791:6d14aa4fbf90

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Gotos removed (except for exception dispatch chains and edge splitting).
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 25 May 2011 20:03:05 +0200
parents 16b9a8b5ad39
children
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2507
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1 /*
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2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.alloc;
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24
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25 import java.util.*;
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26
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27 import com.sun.c1x.lir.*;
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28 import com.sun.c1x.util.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 *
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33 * @author Thomas Wuerthinger
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34 */
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35 public final class LIRInsertionBuffer {
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36
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37 private LIRList lir; // the lir list where ops of this buffer should be inserted later (null when uninitialized)
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38
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39 // list of insertion points. index and count are stored alternately:
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40 // indexAndCount[i * 2]: the index into lir list where "count" ops should be inserted
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41 // indexAndCount[i * 2 + 1]: the number of ops to be inserted at index
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42 private final IntList indexAndCount;
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43
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44 // the LIROps to be inserted
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45 private final List<LIRInstruction> ops;
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46
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47 private void appendNew(int index, int count) {
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48 indexAndCount.add(index);
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49 indexAndCount.add(count);
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50 }
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51
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52 private void setCountAt(int i, int value) {
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53 indexAndCount.set((i << 1) + 1, value);
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54 }
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55
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56 LIRInsertionBuffer() {
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57 ops = new ArrayList<LIRInstruction>(8);
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58 indexAndCount = new IntList(8);
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59 }
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60
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61 // must be called before using the insertion buffer
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62 void init(LIRList lir) {
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63 assert !initialized() : "already initialized";
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64 this.lir = lir;
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65 indexAndCount.clear();
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66 ops.clear();
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67 }
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68
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69 boolean initialized() {
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70 return lir != null;
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71 }
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72
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73 // called automatically when the buffer is appended to the LIRList
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74 public void finish() {
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75 lir = null;
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76 }
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77
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78 // accessors
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79 public LIRList lirList() {
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80 return lir;
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81 }
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82
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83 public int numberOfInsertionPoints() {
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84 return indexAndCount.size() >> 1;
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85 }
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86
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87 public int indexAt(int i) {
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88 return indexAndCount.get((i << 1));
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89 }
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90
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91 public int countAt(int i) {
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92 return indexAndCount.get((i << 1) + 1);
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93 }
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94
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95 public int numberOfOps() {
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96 return ops.size();
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97 }
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98
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99 public LIRInstruction opAt(int i) {
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100 return ops.get(i);
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101 }
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102
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103 void move(int index, CiValue src, CiValue dst, LIRDebugInfo info) {
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104 append(index, new LIROp1(LIROpcode.Move, src, dst, dst.kind, info));
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105 }
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106
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107 // Implementation of LIRInsertionBuffer
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108
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109 private void append(int index, LIRInstruction op) {
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110 assert indexAndCount.size() % 2 == 0 : "must have a count for each index";
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111
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112 int i = numberOfInsertionPoints() - 1;
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113 if (i < 0 || indexAt(i) < index) {
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114 appendNew(index, 1);
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115 } else {
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116 assert indexAt(i) == index : "can append LIROps in ascending order only";
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117 assert countAt(i) > 0 : "check";
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118 setCountAt(i, countAt(i) + 1);
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119 }
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120 ops.add(op);
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121
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122 assert verify();
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123 }
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124
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125 private boolean verify() {
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126 int sum = 0;
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127 int prevIdx = -1;
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128
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129 for (int i = 0; i < numberOfInsertionPoints(); i++) {
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130 assert prevIdx < indexAt(i) : "index must be ordered ascending";
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131 sum += countAt(i);
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132 }
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133 assert sum == numberOfOps() : "wrong total sum";
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134 return true;
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135 }
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136 }