Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/value/FrameState.java @ 2582:768d77a1c7af
new node layout: Instruction
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 05 May 2011 13:47:14 +0200 |
parents | 4a36a0bd6d18 |
children | 01c5c0443158 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 2011, 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.value; |
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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.*; |
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28 import com.sun.c1x.graph.*; |
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29 import com.sun.c1x.ir.*; |
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30 import com.sun.cri.ci.*; |
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31 |
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32 /** |
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33 * The {@code FrameState} class encapsulates the frame state (i.e. local variables and |
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34 * operand stack) at a particular point in the abstract interpretation. |
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35 * |
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36 * @author Ben L. Titzer |
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37 */ |
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38 public abstract class FrameState { |
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39 |
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40 /** |
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41 * The operand stack and local variables. |
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42 * The local variables occupy the index range {@code [0 .. maxLocals)}. |
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43 * The operand stack occupies the index range {@code [maxLocals .. values.length)}. |
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44 * The top of the operand stack is at index {@code maxLocals + stackIndex}. |
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45 * This does not include the operand stack or local variables of parent frames. |
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46 * |
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47 * {@linkplain CiKind#isDoubleWord() Double-word} local variables and |
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48 * operand stack values occupy 2 slots in this array with the second slot |
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49 * being {@code null}. |
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50 */ |
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51 protected final Value[] values; |
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52 |
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53 /** |
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54 * The depth of the operand stack. |
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55 * The top of stack value is in {@code values[maxLocals + stackIndex]}. |
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56 */ |
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57 protected int stackIndex; |
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58 |
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59 /** |
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60 * The number of local variables. |
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61 */ |
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62 protected final int maxLocals; |
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63 |
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64 /** |
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65 * The bytecode index to which this frame state applies. This will be {@code -1} |
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66 * iff this state is mutable. |
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67 */ |
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68 public final int bci; |
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69 |
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70 /** |
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71 * The list of locks held by this frame state. |
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72 * This does not include locks held by parent frames. |
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73 */ |
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74 protected ArrayList<Value> locks; |
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75 |
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76 /** |
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77 * The number of minimum stack slots required for doing IR wrangling during |
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78 * {@linkplain GraphBuilder bytecode parsing}. While this may hide stack |
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79 * overflow issues in the original bytecode, the assumption is that such |
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80 * issues must be caught by the verifier. |
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81 */ |
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82 private static final int MINIMUM_STACK_SLOTS = 1; |
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83 |
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84 /** |
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85 * Creates a {@code FrameState} for the given scope and maximum number of stack and local variables. |
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86 * |
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87 * @param irScope the inlining context of the method |
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88 * @param bci the bytecode index of the frame state |
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89 * @param maxLocals maximum number of locals |
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90 * @param maxStack maximum size of the stack |
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91 */ |
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92 public FrameState(int bci, int maxLocals, int maxStack) { |
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93 this.bci = bci; |
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94 this.values = new Value[maxLocals + Math.max(maxStack, MINIMUM_STACK_SLOTS)]; |
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95 this.maxLocals = maxLocals; |
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96 C1XMetrics.FrameStatesCreated++; |
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97 C1XMetrics.FrameStateValuesCreated += this.values.length; |
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98 } |
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99 |
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100 /** |
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101 * Copies the contents of this frame state so that further updates to either stack aren't reflected in the other. |
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102 * @param bci the bytecode index of the copy |
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103 * @param withLocals indicates whether to copy the local state |
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104 * @param withStack indicates whether to copy the stack state |
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105 * @param withLocks indicates whether to copy the lock state |
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106 * |
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107 * @return a new frame state with the specified components |
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108 */ |
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109 public MutableFrameState copy(int bci, boolean withLocals, boolean withStack, boolean withLocks) { |
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110 final MutableFrameState other = new MutableFrameState(bci, localsSize(), maxStackSize()); |
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111 if (withLocals && withStack) { |
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112 // fast path: use array copy |
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113 System.arraycopy(values, 0, other.values, 0, valuesSize()); |
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114 other.stackIndex = stackIndex; |
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115 } else { |
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116 if (withLocals) { |
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117 other.replaceLocals(this); |
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118 } |
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119 if (withStack) { |
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120 other.replaceStack(this); |
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121 } |
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122 } |
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123 if (withLocks) { |
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124 other.replaceLocks(this); |
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125 } |
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126 return other; |
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127 } |
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128 |
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129 /** |
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130 * Gets a mutable copy ({@link MutableFrameState}) of this frame state. |
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131 */ |
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132 public MutableFrameState copy() { |
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133 return copy(bci, true, true, true); |
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134 } |
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135 |
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136 /** |
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137 * Gets an immutable copy of this frame state but without the stack. |
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138 */ |
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139 public FrameState immutableCopyWithEmptyStack() { |
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140 return copy(bci, true, false, true); |
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141 } |
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142 |
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143 /** |
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144 * Gets an immutable copy of this frame state but without the frame info. |
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145 */ |
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146 public FrameState immutableCopyCodePosOnly() { |
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147 return copy(bci, false, false, false); |
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148 } |
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149 |
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150 public boolean isCompatibleWith(FrameState other) { |
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151 if (stackSize() != other.stackSize() || localsSize() != other.localsSize() || locksSize() != other.locksSize()) { |
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152 return false; |
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153 } |
2507
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154 for (int i = 0; i < stackIndex; i++) { |
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155 Value x = stackAt(i); |
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156 Value y = other.stackAt(i); |
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157 if (x != y && typeMismatch(x, y)) { |
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158 return false; |
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159 } |
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160 } |
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161 if (locks != null) { |
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162 for (int i = 0; i < locks.size(); i++) { |
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163 if (lockAt(i) != other.lockAt(i)) { |
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164 return false; |
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165 } |
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166 } |
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167 } |
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168 return true; |
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169 } |
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170 |
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171 /** |
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172 * Returns the size of the local variables. |
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173 * |
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174 * @return the size of the local variables |
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175 */ |
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176 public int localsSize() { |
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177 return maxLocals; |
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178 } |
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179 |
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180 /** |
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181 * Gets number of locks held by this frame state. |
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182 */ |
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183 public int locksSize() { |
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184 return locks == null ? 0 : locks.size(); |
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185 } |
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186 |
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187 /** |
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188 * Gets the current size (height) of the stack. |
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189 */ |
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190 public int stackSize() { |
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191 return stackIndex; |
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192 } |
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193 |
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194 /** |
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195 * Gets the maximum size (height) of the stack. |
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196 ] */ |
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197 public int maxStackSize() { |
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198 return values.length - maxLocals; |
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199 } |
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200 |
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201 /** |
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202 * Checks whether the stack is empty. |
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203 * |
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204 * @return {@code true} the stack is currently empty |
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205 */ |
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206 public boolean stackEmpty() { |
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207 return stackIndex == 0; |
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208 } |
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209 |
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210 /** |
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211 * Invalidates the local variable at the specified index. If the specified index refers to a doubleword local, then |
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212 * invalidates the high word as well. |
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213 * |
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214 * @param i the index of the local to invalidate |
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215 */ |
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216 public void invalidateLocal(int i) { |
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217 // note that for double word locals, the high slot should already be null |
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218 // unless the local is actually dead and the high slot is being reused; |
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219 // in either case, it is not necessary to null the high slot |
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220 values[i] = null; |
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221 } |
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222 |
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223 /** |
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224 * Loads the local variable at the specified index. |
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225 * |
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226 * @param i the index of the local variable to load |
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227 * @return the instruction that produced the specified local |
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228 */ |
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229 public Value loadLocal(int i) { |
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230 assert i < maxLocals : "local variable index out of range: " + i; |
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231 Value x = values[i]; |
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232 if (x != null) { |
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233 if (x.isIllegal()) { |
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234 return null; |
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235 } |
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236 assert x.kind.isSingleWord() || values[i + 1] == null || values[i + 1] instanceof Phi; |
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237 } |
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238 return x; |
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239 } |
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240 |
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241 /** |
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242 * Stores a given local variable at the specified index. If the value is a {@linkplain CiKind#isDoubleWord() double word}, |
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243 * then the next local variable index is also overwritten. |
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244 * |
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245 * @param i the index at which to store |
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246 * @param x the instruction which produces the value for the local |
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247 */ |
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248 public void storeLocal(int i, Value x) { |
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249 assert i < maxLocals : "local variable index out of range: " + i; |
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250 invalidateLocal(i); |
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251 values[i] = x; |
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252 if (isDoubleWord(x)) { |
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253 // (tw) if this was a double word then kill i+1 |
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254 values[i + 1] = null; |
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255 } |
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256 if (i > 0) { |
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257 // if there was a double word at i - 1, then kill it |
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258 Value p = values[i - 1]; |
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259 if (isDoubleWord(p)) { |
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260 values[i - 1] = null; |
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261 } |
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262 } |
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263 } |
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264 |
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265 /** |
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266 * Get the value on the stack at the specified stack index. |
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267 * |
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268 * @param i the index into the stack, with {@code 0} being the bottom of the stack |
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269 * @return the instruction at the specified position in the stack |
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270 */ |
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271 public final Value stackAt(int i) { |
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272 assert i < stackIndex; |
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273 return values[i + maxLocals]; |
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274 } |
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275 |
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276 /** |
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277 * Gets the value in the local variables at the specified index. |
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278 * |
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279 * @param i the index into the locals |
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280 * @return the instruction that produced the value for the specified local |
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281 */ |
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282 public final Value localAt(int i) { |
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283 assert i < maxLocals : "local variable index out of range: " + i; |
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284 return values[i]; |
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285 } |
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286 |
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287 /** |
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288 * Retrieves the lock at the specified index in the lock stack. |
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289 * @param i the index into the lock stack |
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290 * @return the instruction which produced the object at the specified location in the lock stack |
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291 */ |
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292 public final Value lockAt(int i) { |
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293 return locks.get(i); |
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294 } |
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295 |
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296 /** |
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297 * Inserts a phi statement into the stack at the specified stack index. |
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298 * @param block the block begin for which we are creating the phi |
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299 * @param i the index into the stack for which to create a phi |
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300 */ |
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301 public void setupPhiForStack(BlockBegin block, int i) { |
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302 Value p = stackAt(i); |
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303 if (p != null) { |
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304 if (p instanceof Phi) { |
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305 Phi phi = (Phi) p; |
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306 if (phi.block() == block && phi.isOnStack() && phi.stackIndex() == i) { |
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307 return; |
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308 } |
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309 } |
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310 values[maxLocals + i] = new Phi(p.kind, block, -i - 1); |
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311 } |
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312 } |
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313 |
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314 /** |
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315 * Inserts a phi statement for the local at the specified index. |
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316 * @param block the block begin for which we are creating the phi |
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317 * @param i the index of the local variable for which to create the phi |
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318 */ |
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319 public void setupPhiForLocal(BlockBegin block, int i) { |
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320 Value p = values[i]; |
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321 if (p instanceof Phi) { |
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322 Phi phi = (Phi) p; |
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323 if (phi.block() == block && phi.isLocal() && phi.localIndex() == i) { |
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324 return; |
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325 } |
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326 } |
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327 storeLocal(i, new Phi(p.kind, block, i)); |
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328 } |
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329 |
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330 /** |
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331 * Gets the value at a specified index in the set of operand stack and local values represented by this frame. |
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332 * This method should only be used to iterate over all the values in this frame, irrespective of whether |
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333 * they are on the stack or in local variables. |
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334 * To iterate the stack slots, the {@link #stackAt(int)} and {@link #stackSize()} methods should be used. |
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335 * To iterate the local variables, the {@link #localAt(int)} and {@link #localsSize()} methods should be used. |
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336 * |
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337 * @param i a value in the range {@code [0 .. valuesSize()]} |
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338 * @return the value at index {@code i} which may be {@code null} |
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339 */ |
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340 public final Value valueAt(int i) { |
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341 return values[i]; |
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342 } |
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343 |
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344 /** |
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345 * The number of operand stack slots and local variables in this frame. |
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346 * This method should typically only be used in conjunction with {@link #valueAt(int)}. |
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347 * To iterate the stack slots, the {@link #stackAt(int)} and {@link #stackSize()} methods should be used. |
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348 * To iterate the local variables, the {@link #localAt(int)} and {@link #localsSize()} methods should be used. |
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349 * |
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350 * @return the number of local variables in this frame |
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351 */ |
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352 public final int valuesSize() { |
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353 return maxLocals + stackIndex; |
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354 } |
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355 |
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356 public void checkPhis(BlockBegin block, FrameState other) { |
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357 checkSize(other); |
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358 final int max = valuesSize(); |
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359 for (int i = 0; i < max; i++) { |
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360 Value x = values[i]; |
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361 Value y = other.values[i]; |
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362 if (x != null && x != y) { |
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363 if (x instanceof Phi) { |
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364 Phi phi = (Phi) x; |
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365 if (phi.block() == block) { |
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366 for (int j = 0; j < phi.phiInputCount(); j++) { |
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367 if (phi.inputIn(other) == null) { |
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368 throw new CiBailout("phi " + phi + " has null operand at new predecessor"); |
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369 } |
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370 } |
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371 continue; |
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372 } |
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373 } |
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374 throw new CiBailout("instruction is not a phi or null at " + i); |
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375 } |
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376 } |
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377 } |
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378 |
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379 private void checkSize(FrameState other) { |
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380 if (other.stackIndex != stackIndex) { |
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381 throw new CiBailout("stack sizes do not match"); |
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382 } else if (other.maxLocals != maxLocals) { |
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383 throw new CiBailout("local sizes do not match"); |
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384 } |
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385 } |
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386 |
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387 public void merge(BlockBegin block, FrameState other) { |
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388 checkSize(other); |
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389 for (int i = 0; i < valuesSize(); i++) { |
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390 Value x = values[i]; |
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391 if (x != null) { |
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392 Value y = other.values[i]; |
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393 if (x != y) { |
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394 if (typeMismatch(x, y)) { |
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395 if (x instanceof Phi) { |
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396 Phi phi = (Phi) x; |
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397 if (phi.block() == block) { |
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398 phi.makeDead(); |
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399 } |
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400 } |
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401 values[i] = null; |
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402 continue; |
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403 } |
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404 if (i < maxLocals) { |
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405 // this a local |
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406 setupPhiForLocal(block, i); |
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407 } else { |
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408 // this is a stack slot |
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409 setupPhiForStack(block, i - maxLocals); |
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410 } |
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411 } |
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412 } |
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413 } |
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414 } |
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415 |
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416 private static boolean typeMismatch(Value x, Value y) { |
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417 return y == null || x.kind != y.kind; |
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418 } |
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419 |
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420 private static boolean isDoubleWord(Value x) { |
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421 return x != null && x.kind.isDoubleWord(); |
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422 } |
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423 |
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424 /** |
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425 * The interface implemented by a client of {@link FrameState#forEachPhi(BlockBegin, PhiProcedure)} and |
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426 * {@link FrameState#forEachLivePhi(BlockBegin, PhiProcedure)}. |
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427 */ |
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428 public static interface PhiProcedure { |
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429 boolean doPhi(Phi phi); |
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430 } |
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431 |
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432 /** |
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433 * Traverses all {@linkplain Phi phis} of a given block in this frame state. |
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434 * |
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435 * @param block only phis {@linkplain Phi#block() associated} with this block are traversed |
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436 * @param proc the call back invoked for each live phi traversed |
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437 */ |
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438 public boolean forEachPhi(BlockBegin block, PhiProcedure proc) { |
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439 int max = this.valuesSize(); |
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440 for (int i = 0; i < max; i++) { |
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441 Value instr = values[i]; |
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442 if (instr instanceof Phi && !instr.isDeadPhi()) { |
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443 Phi phi = (Phi) instr; |
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444 if (block == null || phi.block() == block) { |
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445 if (!proc.doPhi(phi)) { |
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446 return false; |
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447 } |
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448 } |
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449 } |
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450 } |
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451 return true; |
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452 } |
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453 |
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454 /** |
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455 * Traverses all live {@linkplain Phi phis} of a given block in this frame state. |
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456 * |
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457 * @param block only phis {@linkplain Phi#block() associated} with this block are traversed |
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458 * @param proc the call back invoked for each live phi traversed |
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459 */ |
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460 public final boolean forEachLivePhi(BlockBegin block, PhiProcedure proc) { |
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461 int max = this.valuesSize(); |
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462 for (int i = 0; i < max; i++) { |
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463 Value instr = values[i]; |
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464 if (instr instanceof Phi && !instr.isDeadPhi()) { |
2507
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465 Phi phi = (Phi) instr; |
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466 if (block == null || phi.block() == block) { |
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467 if (!proc.doPhi(phi)) { |
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468 return false; |
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469 } |
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470 } |
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471 } |
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472 } |
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473 return true; |
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474 } |
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475 |
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476 /** |
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477 * Checks whether this frame state has any {@linkplain Phi phi} statements. |
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478 */ |
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479 public boolean hasPhis() { |
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480 int max = valuesSize(); |
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481 for (int i = 0; i < max; i++) { |
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482 Value value = values[i]; |
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483 if (value instanceof Phi) { |
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484 return true; |
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485 } |
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486 } |
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487 return false; |
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488 } |
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489 |
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490 /** |
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491 * Iterates over all the values in this frame state and its callers, including the stack, locals, and locks. |
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492 * @param closure the closure to apply to each value |
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493 */ |
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494 public void valuesDo(ValueClosure closure) { |
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495 valuesDo(this, closure); |
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496 } |
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497 |
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498 /** |
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499 * Iterates over all the values of a given frame state and its callers, including the stack, locals, and locks. |
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500 * @param closure the closure to apply to each value |
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501 */ |
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502 public static void valuesDo(FrameState state, ValueClosure closure) { |
2564
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503 final int max = state.valuesSize(); |
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504 for (int i = 0; i < max; i++) { |
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505 if (state.values[i] != null) { |
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506 Value newValue = closure.apply(state.values[i]); |
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507 state.values[i] = newValue; |
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508 } |
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509 } |
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510 if (state.locks != null) { |
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511 for (int i = 0; i < state.locks.size(); i++) { |
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512 Value instr = state.locks.get(i); |
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513 if (instr != null) { |
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514 state.locks.set(i, closure.apply(instr)); |
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515 } |
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516 } |
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517 } |
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518 } |
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519 |
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520 /** |
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521 * The interface implemented by a client of {@link FrameState#forEachLiveStateValue(ValueProcedure)}. |
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522 */ |
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523 public static interface ValueProcedure { |
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524 void doValue(Value value); |
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525 } |
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526 |
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527 /** |
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528 * Traverses all {@linkplain Value#isLive() live values} of this frame state. |
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529 * |
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530 * @param proc the call back called to process each live value traversed |
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531 */ |
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532 public final void forEachLiveStateValue(ValueProcedure proc) { |
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533 final int max = this.valuesSize(); |
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534 for (int i = 0; i < max; i++) { |
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535 Value value = this.values[i]; |
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536 if (value != null) { |
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537 proc.doValue(value); |
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538 } |
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539 } |
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540 } |
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541 |
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542 @Override |
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543 public String toString() { |
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544 StringBuilder sb = new StringBuilder(); |
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545 String nl = String.format("%n"); |
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546 sb.append("[bci: ").append(this.bci).append("]").append(nl); |
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547 for (int i = 0; i < this.localsSize(); ++i) { |
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548 Value value = this.localAt(i); |
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549 sb.append(String.format(" local[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value)); |
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550 } |
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551 for (int i = 0; i < this.stackSize(); ++i) { |
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552 Value value = this.stackAt(i); |
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553 sb.append(String.format(" stack[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value)); |
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554 } |
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555 for (int i = 0; i < this.locksSize(); ++i) { |
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556 Value value = this.lockAt(i); |
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557 sb.append(String.format(" lock[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value)); |
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558 } |
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559 return sb.toString(); |
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560 } |
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561 } |