Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/value/FrameState.java @ 2610:39aa89baa165
cleanup: FrameState copy methods, ImmutableFrameState
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 13:03:33 +0200 |
parents | 01c5c0443158 |
children | bd235cb4375a |
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 |
2603 | 27 import com.oracle.graal.graph.*; |
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28 import com.sun.c1x.*; |
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29 import com.sun.c1x.graph.*; |
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30 import com.sun.c1x.ir.*; |
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31 import com.sun.c1x.util.*; |
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32 import com.sun.cri.ci.*; |
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33 |
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34 /** |
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35 * The {@code FrameState} class encapsulates the frame state (i.e. local variables and |
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36 * operand stack) at a particular point in the abstract interpretation. |
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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 FrameState immutableCopy(int bci, boolean withLocals, boolean withStack, boolean withLocks) { |
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110 final ImmutableFrameState other = new ImmutableFrameState(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 System.arraycopy(values, 0, other.values, 0, maxLocals); |
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118 } |
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119 if (withStack) { |
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120 System.arraycopy(values, maxLocals, other.values, other.maxLocals, stackIndex); |
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121 other.stackIndex = stackIndex; |
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122 } |
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123 } |
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124 if (withLocks) { |
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125 if (locks != null) { |
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126 other.locks = new ArrayList<Value>(locks); |
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127 } |
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128 } |
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129 return other; |
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130 } |
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131 |
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132 /** |
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133 * Gets a mutable copy ({@link MutableFrameState}) of this frame state. |
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134 */ |
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135 public MutableFrameState copy() { |
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136 final MutableFrameState other = new MutableFrameState(bci, localsSize(), maxStackSize()); |
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137 System.arraycopy(values, 0, other.values, 0, valuesSize()); |
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138 other.stackIndex = stackIndex; |
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139 if (locks != null) { |
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140 other.locks = new ArrayList<Value>(locks); |
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141 } |
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142 return other; |
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143 } |
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144 |
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145 /** |
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146 * Gets a immutable copy ({@link MutableFrameState}) of this frame state. |
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147 */ |
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148 public FrameState immutableCopy() { |
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149 return immutableCopy(bci, true, true, true); |
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150 } |
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151 |
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152 /** |
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153 * Gets an immutable copy of this frame state but without the stack. |
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154 */ |
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155 public FrameState immutableCopyWithEmptyStack() { |
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156 return immutableCopy(bci, true, false, true); |
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157 } |
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158 |
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159 /** |
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160 * Gets an immutable copy of this frame state but without the frame info. |
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161 */ |
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162 public FrameState immutableCopyCodePosOnly() { |
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163 return immutableCopy(bci, false, false, false); |
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164 } |
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165 |
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166 public boolean isCompatibleWith(FrameState other) { |
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167 if (stackSize() != other.stackSize() || localsSize() != other.localsSize() || locksSize() != other.locksSize()) { |
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168 return false; |
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169 } |
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170 for (int i = 0; i < stackIndex; i++) { |
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171 Value x = stackAt(i); |
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172 Value y = other.stackAt(i); |
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173 if (x != y && typeMismatch(x, y)) { |
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174 return false; |
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175 } |
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176 } |
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177 if (locks != null) { |
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178 for (int i = 0; i < locks.size(); i++) { |
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179 if (lockAt(i) != other.lockAt(i)) { |
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180 return false; |
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181 } |
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182 } |
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183 } |
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184 return true; |
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185 } |
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186 |
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187 /** |
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188 * Returns the size of the local variables. |
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189 * |
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190 * @return the size of the local variables |
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191 */ |
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192 public int localsSize() { |
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193 return maxLocals; |
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194 } |
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195 |
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196 /** |
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197 * Gets number of locks held by this frame state. |
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198 */ |
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199 public int locksSize() { |
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200 return locks == null ? 0 : locks.size(); |
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201 } |
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202 |
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203 /** |
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204 * Gets the current size (height) of the stack. |
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205 */ |
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206 public int stackSize() { |
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207 return stackIndex; |
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208 } |
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209 |
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210 /** |
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211 * Gets the maximum size (height) of the stack. |
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212 ] */ |
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213 public int maxStackSize() { |
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214 return values.length - maxLocals; |
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215 } |
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216 |
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217 /** |
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218 * Checks whether the stack is empty. |
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219 * |
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220 * @return {@code true} the stack is currently empty |
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221 */ |
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222 public boolean stackEmpty() { |
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223 return stackIndex == 0; |
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224 } |
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225 |
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226 /** |
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227 * Invalidates the local variable at the specified index. If the specified index refers to a doubleword local, then |
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228 * invalidates the high word as well. |
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229 * |
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230 * @param i the index of the local to invalidate |
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231 */ |
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232 public void invalidateLocal(int i) { |
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233 // note that for double word locals, the high slot should already be null |
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234 // unless the local is actually dead and the high slot is being reused; |
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235 // in either case, it is not necessary to null the high slot |
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236 values[i] = null; |
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237 } |
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238 |
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239 /** |
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240 * Loads the local variable at the specified index. |
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241 * |
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242 * @param i the index of the local variable to load |
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243 * @return the instruction that produced the specified local |
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244 */ |
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245 public Value loadLocal(int i) { |
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246 assert i < maxLocals : "local variable index out of range: " + i; |
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247 Value x = values[i]; |
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248 if (x != null) { |
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249 if (x.isIllegal()) { |
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250 return null; |
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251 } |
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252 assert x.kind.isSingleWord() || values[i + 1] == null || values[i + 1] instanceof Phi; |
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253 } |
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254 return x; |
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255 } |
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256 |
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257 /** |
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258 * Stores a given local variable at the specified index. If the value is a {@linkplain CiKind#isDoubleWord() double word}, |
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259 * then the next local variable index is also overwritten. |
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260 * |
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261 * @param i the index at which to store |
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262 * @param x the instruction which produces the value for the local |
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263 */ |
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264 public void storeLocal(int i, Value x) { |
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265 assert i < maxLocals : "local variable index out of range: " + i; |
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266 invalidateLocal(i); |
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267 values[i] = x; |
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268 if (isDoubleWord(x)) { |
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269 // (tw) if this was a double word then kill i+1 |
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270 values[i + 1] = null; |
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271 } |
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272 if (i > 0) { |
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273 // if there was a double word at i - 1, then kill it |
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274 Value p = values[i - 1]; |
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275 if (isDoubleWord(p)) { |
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276 values[i - 1] = null; |
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277 } |
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278 } |
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279 } |
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280 |
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281 /** |
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282 * Get the value on the stack at the specified stack index. |
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283 * |
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284 * @param i the index into the stack, with {@code 0} being the bottom of the stack |
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285 * @return the instruction at the specified position in the stack |
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286 */ |
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287 public final Value stackAt(int i) { |
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288 assert i < stackIndex; |
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289 return values[i + maxLocals]; |
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290 } |
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291 |
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292 /** |
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293 * Gets the value in the local variables at the specified index. |
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294 * |
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295 * @param i the index into the locals |
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296 * @return the instruction that produced the value for the specified local |
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297 */ |
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298 public final Value localAt(int i) { |
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299 assert i < maxLocals : "local variable index out of range: " + i; |
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300 return values[i]; |
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301 } |
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302 |
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303 /** |
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304 * Retrieves the lock at the specified index in the lock stack. |
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305 * @param i the index into the lock stack |
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306 * @return the instruction which produced the object at the specified location in the lock stack |
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307 */ |
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308 public final Value lockAt(int i) { |
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309 return locks.get(i); |
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310 } |
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311 |
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312 /** |
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313 * Inserts a phi statement into the stack at the specified stack index. |
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314 * @param block the block begin for which we are creating the phi |
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315 * @param i the index into the stack for which to create a phi |
2603 | 316 * @param graph |
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317 */ |
2603 | 318 public void setupPhiForStack(BlockBegin block, int i, Graph graph) { |
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319 Value p = stackAt(i); |
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320 if (p != null) { |
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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.isOnStack() && phi.stackIndex() == i) { |
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324 return; |
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325 } |
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326 } |
2603 | 327 values[maxLocals + i] = new Phi(p.kind, block, -i - 1, graph); |
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328 } |
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329 } |
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330 |
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331 /** |
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332 * Inserts a phi statement for the local at the specified index. |
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333 * @param block the block begin for which we are creating the phi |
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334 * @param i the index of the local variable for which to create the phi |
2603 | 335 * @param graph |
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336 */ |
2603 | 337 public void setupPhiForLocal(BlockBegin block, int i, Graph graph) { |
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338 Value p = values[i]; |
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339 if (p instanceof Phi) { |
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340 Phi phi = (Phi) p; |
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341 if (phi.block() == block && phi.isLocal() && phi.localIndex() == i) { |
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342 return; |
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343 } |
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344 } |
2603 | 345 storeLocal(i, new Phi(p.kind, block, i, graph)); |
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346 } |
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347 |
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348 /** |
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349 * Gets the value at a specified index in the set of operand stack and local values represented by this frame. |
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350 * This method should only be used to iterate over all the values in this frame, irrespective of whether |
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351 * they are on the stack or in local variables. |
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352 * To iterate the stack slots, the {@link #stackAt(int)} and {@link #stackSize()} methods should be used. |
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353 * To iterate the local variables, the {@link #localAt(int)} and {@link #localsSize()} methods should be used. |
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354 * |
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355 * @param i a value in the range {@code [0 .. valuesSize()]} |
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356 * @return the value at index {@code i} which may be {@code null} |
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357 */ |
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358 public final Value valueAt(int i) { |
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359 return values[i]; |
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360 } |
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361 |
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362 /** |
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363 * The number of operand stack slots and local variables in this frame. |
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364 * This method should typically only be used in conjunction with {@link #valueAt(int)}. |
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365 * To iterate the stack slots, the {@link #stackAt(int)} and {@link #stackSize()} methods should be used. |
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366 * To iterate the local variables, the {@link #localAt(int)} and {@link #localsSize()} methods should be used. |
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367 * |
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368 * @return the number of local variables in this frame |
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369 */ |
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370 public final int valuesSize() { |
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371 return maxLocals + stackIndex; |
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372 } |
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373 |
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374 public void checkPhis(BlockBegin block, FrameState other) { |
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375 checkSize(other); |
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376 final int max = valuesSize(); |
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377 for (int i = 0; i < max; i++) { |
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378 Value x = values[i]; |
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379 Value y = other.values[i]; |
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380 if (x != null && x != y) { |
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381 if (x instanceof Phi) { |
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382 Phi phi = (Phi) x; |
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383 if (phi.block() == block) { |
2582
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384 for (int j = 0; j < phi.phiInputCount(); j++) { |
2507
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385 if (phi.inputIn(other) == null) { |
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386 throw new CiBailout("phi " + phi + " has null operand at new predecessor"); |
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387 } |
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388 } |
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389 continue; |
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390 } |
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391 } |
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392 throw new CiBailout("instruction is not a phi or null at " + i); |
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393 } |
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394 } |
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395 } |
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396 |
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397 private void checkSize(FrameState other) { |
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398 if (other.stackIndex != stackIndex) { |
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399 throw new CiBailout("stack sizes do not match"); |
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400 } else if (other.maxLocals != maxLocals) { |
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401 throw new CiBailout("local sizes do not match"); |
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402 } |
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403 } |
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404 |
2603 | 405 public void merge(BlockBegin block, FrameState other, Graph graph) { |
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406 checkSize(other); |
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407 for (int i = 0; i < valuesSize(); i++) { |
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408 Value x = values[i]; |
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409 if (x != null) { |
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410 Value y = other.values[i]; |
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411 if (x != y) { |
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412 if (typeMismatch(x, y)) { |
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413 if (x instanceof Phi) { |
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414 Phi phi = (Phi) x; |
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415 if (phi.block() == block) { |
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416 phi.makeDead(); |
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417 } |
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418 } |
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419 values[i] = null; |
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420 continue; |
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421 } |
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422 if (i < maxLocals) { |
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423 // this a local |
2603 | 424 setupPhiForLocal(block, i, graph); |
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425 } else { |
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426 // this is a stack slot |
2603 | 427 setupPhiForStack(block, i - maxLocals, graph); |
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428 } |
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429 } |
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430 } |
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431 } |
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432 } |
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433 |
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434 private static boolean typeMismatch(Value x, Value y) { |
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435 return y == null || x.kind != y.kind; |
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436 } |
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437 |
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438 private static boolean isDoubleWord(Value x) { |
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439 return x != null && x.kind.isDoubleWord(); |
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440 } |
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441 |
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442 /** |
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443 * The interface implemented by a client of {@link FrameState#forEachPhi(BlockBegin, PhiProcedure)} and |
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444 * {@link FrameState#forEachLivePhi(BlockBegin, PhiProcedure)}. |
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445 */ |
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446 public static interface PhiProcedure { |
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447 boolean doPhi(Phi phi); |
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448 } |
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449 |
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450 /** |
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451 * Traverses all live {@linkplain Phi phis} of a given block in this frame state. |
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452 * |
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453 * @param block only phis {@linkplain Phi#block() associated} with this block are traversed |
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454 * @param proc the call back invoked for each live phi traversed |
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455 */ |
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456 public final boolean forEachLivePhi(BlockBegin block, PhiProcedure proc) { |
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457 int max = this.valuesSize(); |
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458 for (int i = 0; i < max; i++) { |
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459 Value instr = values[i]; |
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460 if (instr instanceof Phi && !instr.isDeadPhi()) { |
2507
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461 Phi phi = (Phi) instr; |
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462 if (block == null || phi.block() == block) { |
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463 if (!proc.doPhi(phi)) { |
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464 return false; |
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465 } |
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466 } |
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467 } |
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468 } |
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469 return true; |
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470 } |
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471 |
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472 /** |
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473 * Checks whether this frame state has any {@linkplain Phi phi} statements. |
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474 */ |
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475 public boolean hasPhis() { |
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476 int max = valuesSize(); |
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477 for (int i = 0; i < max; i++) { |
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478 Value value = values[i]; |
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479 if (value instanceof Phi) { |
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480 return true; |
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481 } |
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482 } |
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483 return false; |
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484 } |
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485 |
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486 /** |
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487 * Iterates over all the values in this frame state and its callers, including the stack, locals, and locks. |
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488 * @param closure the closure to apply to each value |
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489 */ |
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490 public void valuesDo(ValueClosure closure) { |
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491 valuesDo(this, closure); |
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492 } |
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493 |
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494 /** |
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495 * Iterates over all the values of a given frame state and its callers, including the stack, locals, and locks. |
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496 * @param closure the closure to apply to each value |
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497 */ |
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498 public static void valuesDo(FrameState state, ValueClosure closure) { |
2564
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499 final int max = state.valuesSize(); |
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500 for (int i = 0; i < max; i++) { |
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501 if (state.values[i] != null) { |
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502 Value newValue = closure.apply(state.values[i]); |
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503 state.values[i] = newValue; |
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504 } |
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505 } |
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506 if (state.locks != null) { |
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507 for (int i = 0; i < state.locks.size(); i++) { |
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508 Value instr = state.locks.get(i); |
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509 if (instr != null) { |
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510 state.locks.set(i, closure.apply(instr)); |
2507
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511 } |
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512 } |
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513 } |
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514 } |
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515 |
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516 /** |
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517 * The interface implemented by a client of {@link FrameState#forEachLiveStateValue(ValueProcedure)}. |
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518 */ |
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519 public static interface ValueProcedure { |
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520 void doValue(Value value); |
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521 } |
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522 |
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523 /** |
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524 * Traverses all {@linkplain Value#isLive() live values} of this frame state. |
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525 * |
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526 * @param proc the call back called to process each live value traversed |
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527 */ |
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528 public final void forEachLiveStateValue(ValueProcedure proc) { |
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529 final int max = this.valuesSize(); |
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530 for (int i = 0; i < max; i++) { |
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531 Value value = this.values[i]; |
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532 if (value != null) { |
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533 proc.doValue(value); |
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534 } |
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535 } |
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536 } |
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537 |
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538 @Override |
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539 public String toString() { |
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540 StringBuilder sb = new StringBuilder(); |
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541 String nl = String.format("%n"); |
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542 sb.append("[bci: ").append(this.bci).append("]").append(nl); |
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543 for (int i = 0; i < this.localsSize(); ++i) { |
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544 Value value = this.localAt(i); |
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545 sb.append(String.format(" local[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value)); |
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546 } |
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547 for (int i = 0; i < this.stackSize(); ++i) { |
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548 Value value = this.stackAt(i); |
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549 sb.append(String.format(" stack[%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.locksSize(); ++i) { |
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552 Value value = this.lockAt(i); |
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553 sb.append(String.format(" lock[%d] = %-8s : %s%n", i, value == null ? "bogus" : value.kind.javaName, value)); |
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554 } |
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555 return sb.toString(); |
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556 } |
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557 } |