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annotate graal/com.oracle.graal.java/src/com/oracle/graal/java/AbstractFrameStateBuilder.java @ 19502:71a6d0ba3a49

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fixed findbugs issue
author Doug Simon <doug.simon@oracle.com>
date Thu, 19 Feb 2015 11:41:13 +0100
parents 9525e4d5b385
children 14e703edb2ab
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1 /*
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2 * Copyright (c) 2014, 2014, 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
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24 package com.oracle.graal.java;
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25
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26 import com.oracle.graal.api.code.*;
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.java.BciBlockMapping.BciBlock;
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29
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30 public abstract class AbstractFrameStateBuilder<T extends KindProvider, S extends AbstractFrameStateBuilder<T, S>> {
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31
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32 protected final ResolvedJavaMethod method;
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33 protected int stackSize;
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34 protected final T[] locals;
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35 protected final T[] stack;
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36 protected T[] lockedObjects;
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37
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38 /**
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39 * Specifies if asserting type checks are enabled.
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40 */
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41 protected final boolean checkTypes;
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42
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43 /**
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44 * @see BytecodeFrame#rethrowException
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45 */
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46 protected boolean rethrowException;
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47
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48 public AbstractFrameStateBuilder(ResolvedJavaMethod method, boolean checkTypes) {
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49 this.method = method;
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50 this.locals = allocateArray(method.getMaxLocals());
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51 this.stack = allocateArray(Math.max(1, method.getMaxStackSize()));
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52 this.lockedObjects = allocateArray(0);
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53 this.checkTypes = checkTypes;
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54 }
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55
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56 protected AbstractFrameStateBuilder(S other) {
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57 this.method = other.method;
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58 this.stackSize = other.stackSize;
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59 this.locals = other.locals.clone();
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60 this.stack = other.stack.clone();
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61 this.lockedObjects = other.lockedObjects.length == 0 ? other.lockedObjects : other.lockedObjects.clone();
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62 this.rethrowException = other.rethrowException;
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63 this.checkTypes = other.checkTypes;
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64
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65 assert locals.length == method.getMaxLocals();
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66 assert stack.length == Math.max(1, method.getMaxStackSize());
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67 }
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68
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69 public abstract S copy();
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70
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71 protected abstract T[] allocateArray(int length);
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72
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73 public abstract boolean isCompatibleWith(S other);
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74
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75 public void clearNonLiveLocals(BciBlock block, LocalLiveness liveness, boolean liveIn) {
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76 /*
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77 * (lstadler) if somebody is tempted to remove/disable this clearing code: it's possible to
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78 * remove it for normal compilations, but not for OSR compilations - otherwise dead object
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79 * slots at the OSR entry aren't cleared. it is also not enough to rely on PiNodes with
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80 * Kind.Illegal, because the conflicting branch might not have been parsed.
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81 */
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82 if (liveness == null) {
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83 return;
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84 }
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85 if (liveIn) {
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86 for (int i = 0; i < locals.length; i++) {
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87 if (!liveness.localIsLiveIn(block, i)) {
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88 locals[i] = null;
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89 }
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90 }
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91 } else {
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92 for (int i = 0; i < locals.length; i++) {
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93 if (!liveness.localIsLiveOut(block, i)) {
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94 locals[i] = null;
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95 }
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96 }
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97 }
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98 }
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99
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100 /**
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101 * @see BytecodeFrame#rethrowException
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102 */
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103 public boolean rethrowException() {
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104 return rethrowException;
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105 }
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106
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107 /**
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108 * @see BytecodeFrame#rethrowException
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109 */
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110 public void setRethrowException(boolean b) {
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111 rethrowException = b;
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112 }
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113
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114 /**
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115 * Returns the size of the local variables.
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116 *
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117 * @return the size of the local variables
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118 */
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119 public int localsSize() {
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120 return locals.length;
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121 }
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122
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123 /**
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124 * Gets the current size (height) of the stack.
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125 */
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126 public int stackSize() {
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127 return stackSize;
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128 }
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129
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130 /**
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131 * @return the current lock depth
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132 */
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133 public int lockDepth() {
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134 return lockedObjects.length;
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135 }
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136
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137 /**
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138 * Gets the value in the local variables at the specified index, without any sanity checking.
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139 *
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140 * @param i the index into the locals
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141 * @return the instruction that produced the value for the specified local
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142 */
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143 public T localAt(int i) {
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144 return locals[i];
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145 }
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146
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147 /**
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148 * Get the value on the stack at the specified stack index.
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149 *
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150 * @param i the index into the stack, with {@code 0} being the bottom of the stack
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151 * @return the instruction at the specified position in the stack
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152 */
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153 public T stackAt(int i) {
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154 return stack[i];
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155 }
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156
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157 /**
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158 * Gets the value in the lock at the specified index, without any sanity checking.
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159 *
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160 * @param i the index into the lock
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161 * @return the instruction that produced the value for the specified lock
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162 */
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163 public T lockAt(int i) {
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164 return lockedObjects[i];
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165 }
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166
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167 public void storeLock(int i, T lock) {
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168 lockedObjects[i] = lock;
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169 }
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170
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171 /**
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172 * Loads the local variable at the specified index, checking that the returned value is non-null
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173 * and that two-stack values are properly handled.
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174 *
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175 * @param i the index of the local variable to load
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176 * @return the instruction that produced the specified local
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177 */
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178 public T loadLocal(int i) {
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179 T x = locals[i];
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180 assert x != null : i;
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181 assert !checkTypes || (x.getKind().getSlotCount() == 1 || locals[i + 1] == null);
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182 assert !checkTypes || (i == 0 || locals[i - 1] == null || locals[i - 1].getKind().getSlotCount() == 1);
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183 return x;
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184 }
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185
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186 /**
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187 * Stores a given local variable at the specified index. If the value occupies two slots, then
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188 * the next local variable index is also overwritten.
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189 *
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190 * @param i the index at which to store
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191 * @param x the instruction which produces the value for the local
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192 */
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193 public void storeLocal(int i, T x) {
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194 assert x == null || !checkTypes || (x.getKind() != Kind.Void && x.getKind() != Kind.Illegal) : "unexpected value: " + x;
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195 locals[i] = x;
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196 if (x != null && x.getKind().needsTwoSlots()) {
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197 // if this is a double word, then kill i+1
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198 locals[i + 1] = null;
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199 }
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200 if (x != null && i > 0) {
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201 T p = locals[i - 1];
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202 if (p != null && p.getKind().needsTwoSlots()) {
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203 // if there was a double word at i - 1, then kill it
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204 locals[i - 1] = null;
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205 }
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206 }
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207 }
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208
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209 public void storeStack(int i, T x) {
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210 assert x == null || (stack[i] == null || x.getKind() == stack[i].getKind()) : "Method does not handle changes from one-slot to two-slot values or non-alive values";
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211 stack[i] = x;
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212 }
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213
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214 /**
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215 * Pushes an instruction onto the stack with the expected type.
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216 *
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217 * @param kind the type expected for this instruction
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218 * @param x the instruction to push onto the stack
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219 */
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220 public void push(Kind kind, T x) {
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221 assert !checkTypes || (x.getKind() != Kind.Void && x.getKind() != Kind.Illegal) : x;
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222 xpush(assertKind(kind, x));
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223 if (kind.needsTwoSlots()) {
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224 xpush(null);
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225 }
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226 }
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227
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228 /**
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229 * Pushes a value onto the stack without checking the type.
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230 *
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231 * @param x the instruction to push onto the stack
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232 */
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233 public void xpush(T x) {
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234 assert !checkTypes || (x == null || (x.getKind() != Kind.Void && x.getKind() != Kind.Illegal));
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235 stack[stackSize++] = x;
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236 }
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237
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238 /**
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239 * Pushes a value onto the stack and checks that it is an int.
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240 *
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241 * @param x the instruction to push onto the stack
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242 */
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243 public void ipush(T x) {
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244 xpush(assertInt(x));
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245 }
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246
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247 /**
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248 * Pushes a value onto the stack and checks that it is a float.
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249 *
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250 * @param x the instruction to push onto the stack
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251 */
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252 public void fpush(T x) {
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253 xpush(assertFloat(x));
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254 }
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255
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256 /**
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257 * Pushes a value onto the stack and checks that it is an object.
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258 *
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259 * @param x the instruction to push onto the stack
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260 */
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261 public void apush(T x) {
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262 xpush(assertObject(x));
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263 }
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264
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265 /**
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266 * Pushes a value onto the stack and checks that it is a long.
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267 *
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268 * @param x the instruction to push onto the stack
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269 */
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270 public void lpush(T x) {
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271 xpush(assertLong(x));
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272 xpush(null);
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273 }
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274
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275 /**
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276 * Pushes a value onto the stack and checks that it is a double.
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277 *
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278 * @param x the instruction to push onto the stack
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279 */
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280 public void dpush(T x) {
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281 xpush(assertDouble(x));
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282 xpush(null);
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283 }
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284
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285 public void pushReturn(Kind kind, T x) {
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286 if (kind != Kind.Void) {
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287 push(kind.getStackKind(), x);
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288 }
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289 }
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290
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291 /**
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292 * Pops an instruction off the stack with the expected type.
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293 *
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294 * @param kind the expected type
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295 * @return the instruction on the top of the stack
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296 */
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297 public T pop(Kind kind) {
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298 assert kind != Kind.Void;
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299 if (kind.needsTwoSlots()) {
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300 xpop();
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301 }
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302 return assertKind(kind, xpop());
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303 }
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304
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305 /**
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306 * Pops a value off of the stack without checking the type.
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307 *
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308 * @return x the instruction popped off the stack
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309 */
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310 public T xpop() {
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311 T result = stack[--stackSize];
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312 return result;
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313 }
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314
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315 /**
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316 * Pops a value off of the stack and checks that it is an int.
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317 *
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318 * @return x the instruction popped off the stack
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319 */
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320 public T ipop() {
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321 return assertInt(xpop());
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322 }
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323
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324 /**
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325 * Pops a value off of the stack and checks that it is a float.
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326 *
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327 * @return x the instruction popped off the stack
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328 */
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329 public T fpop() {
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330 return assertFloat(xpop());
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331 }
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332
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333 /**
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334 * Pops a value off of the stack and checks that it is an object.
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335 *
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336 * @return x the instruction popped off the stack
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337 */
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338 public T apop() {
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339 return assertObject(xpop());
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340 }
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341
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342 /**
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343 * Pops a value off of the stack and checks that it is a long.
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344 *
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345 * @return x the instruction popped off the stack
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346 */
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347 public T lpop() {
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348 assertHigh(xpop());
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349 return assertLong(xpop());
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350 }
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351
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352 /**
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353 * Pops a value off of the stack and checks that it is a double.
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354 *
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355 * @return x the instruction popped off the stack
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356 */
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357 public T dpop() {
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358 assertHigh(xpop());
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359 return assertDouble(xpop());
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360 }
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361
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362 /**
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363 * Pop the specified number of slots off of this stack and return them as an array of
63b0a6af67b7 added abstract base class
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364 * instructions.
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365 *
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366 * @return an array containing the arguments off of the stack
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367 */
18374
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368 public T[] popArguments(int argSize) {
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369 T[] result = allocateArray(argSize);
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370 int newStackSize = stackSize;
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diff changeset
371 for (int i = argSize - 1; i >= 0; i--) {
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diff changeset
372 newStackSize--;
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diff changeset
373 if (stack[newStackSize] == null) {
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374 /* Two-slot value. */
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diff changeset
375 newStackSize--;
18913
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diff changeset
376 assert stack[newStackSize].getKind().needsTwoSlots();
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diff changeset
377 } else {
19496
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Doug Simon <doug.simon@oracle.com>
parents: 19479
diff changeset
378 assert !checkTypes || (stack[newStackSize].getKind().getSlotCount() == 1);
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379 }
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diff changeset
380 result[i] = stack[newStackSize];
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381 }
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diff changeset
382 stackSize = newStackSize;
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diff changeset
383 return result;
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384 }
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385
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386 /**
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387 * Peeks an element from the operand stack.
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388 *
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389 * @param argumentNumber The number of the argument, relative from the top of the stack (0 =
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390 * top). Long and double arguments only count as one argument, i.e., null-slots are
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diff changeset
391 * ignored.
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392 * @return The peeked argument.
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393 */
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394 public T peek(int argumentNumber) {
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395 int idx = stackSize() - 1;
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396 for (int i = 0; i < argumentNumber; i++) {
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397 if (stackAt(idx) == null) {
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diff changeset
398 idx--;
18913
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
399 assert stackAt(idx).getKind().needsTwoSlots();
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400 }
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401 idx--;
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402 }
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403 return stackAt(idx);
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404 }
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405
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406 /**
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407 * Clears all values on this stack.
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408 */
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409 public void clearStack() {
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410 stackSize = 0;
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411 }
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412
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413 private T assertKind(Kind kind, T x) {
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9525e4d5b385 disable (asserting) type checks in the FrameStateBuilder when parsing a replacement
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414 assert x != null && (!checkTypes || x.getKind() == kind) : "kind=" + kind + ", value=" + x + ((x == null) ? "" : ", value.kind=" + x.getKind());
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415 return x;
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416 }
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417
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418 private T assertLong(T x) {
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419 assert x != null && (x.getKind() == Kind.Long);
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420 return x;
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421 }
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422
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423 private T assertInt(T x) {
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424 assert x != null && (x.getKind() == Kind.Int);
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425 return x;
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426 }
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427
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428 private T assertFloat(T x) {
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429 assert x != null && (x.getKind() == Kind.Float);
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430 return x;
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431 }
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432
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433 private T assertObject(T x) {
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434 assert x != null && (!checkTypes || (x.getKind() == Kind.Object));
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435 return x;
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436 }
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437
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438 private T assertDouble(T x) {
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439 assert x != null && (x.getKind() == Kind.Double);
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440 return x;
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441 }
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442
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443 private void assertHigh(T x) {
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444 assert x == null;
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445 }
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446
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447 }