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annotate graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/BytecodeStream.java @ 21713:454a99ca00a9

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fixed canonicalizeprojects issues
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 22:13:10 +0200
parents graal/com.oracle.jvmci.bytecode/src/com/oracle/graal/bytecode/BytecodeStream.java@1c41d00e6b2f
children
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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.oracle.jvmci.bytecode;
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24
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25 /**
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26 * A utility class that makes iterating over bytecodes and reading operands simpler and less error
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27 * prone. For example, it handles the {@link Bytecodes#WIDE} instruction and wide variants of
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28 * instructions internally.
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29 */
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30 public final class BytecodeStream {
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31
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32 private final byte[] code;
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33 private int opcode;
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34 private int curBCI;
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35 private int nextBCI;
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36
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37 /**
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38 * Creates a new {@code BytecodeStream} for the specified bytecode.
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39 *
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40 * @param code the array of bytes that contains the bytecode
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41 */
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42 public BytecodeStream(byte[] code) {
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43 assert code != null;
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44 this.code = code;
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45 setBCI(0);
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46 }
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47
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48 /**
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49 * Advances to the next bytecode.
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50 */
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51 public void next() {
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52 setBCI(nextBCI);
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53 }
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54
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55 /**
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56 * Gets the next bytecode index (no side-effects).
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57 *
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58 * @return the next bytecode index
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59 */
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60 public int nextBCI() {
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61 return nextBCI;
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62 }
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63
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64 /**
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65 * Gets the current bytecode index.
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66 *
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67 * @return the current bytecode index
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68 */
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69 public int currentBCI() {
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70 return curBCI;
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71 }
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72
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73 /**
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74 * Gets the bytecode index of the end of the code.
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75 *
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76 * @return the index of the end of the code
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77 */
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78 public int endBCI() {
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79 return code.length;
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80 }
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81
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82 /**
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83 * Gets the current opcode. This method will never return the {@link Bytecodes#WIDE WIDE}
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84 * opcode, but will instead return the opcode that is modified by the {@code WIDE} opcode.
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85 *
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86 * @return the current opcode; {@link Bytecodes#END} if at or beyond the end of the code
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87 */
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88 public int currentBC() {
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89 if (opcode == Bytecodes.WIDE) {
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90 return Bytes.beU1(code, curBCI + 1);
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91 } else {
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92 return opcode;
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93 }
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94 }
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95
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96 /**
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97 * Reads the index of a local variable for one of the load or store instructions. The WIDE
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98 * modifier is handled internally.
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99 *
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100 * @return the index of the local variable
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101 */
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102 public int readLocalIndex() {
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103 // read local variable index for load/store
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104 if (opcode == Bytecodes.WIDE) {
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105 return Bytes.beU2(code, curBCI + 2);
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106 }
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107 return Bytes.beU1(code, curBCI + 1);
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108 }
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109
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110 /**
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111 * Read the delta for an {@link Bytecodes#IINC} bytecode.
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112 *
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113 * @return the delta for the {@code IINC}
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114 */
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115 public int readIncrement() {
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116 // read the delta for the iinc bytecode
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117 if (opcode == Bytecodes.WIDE) {
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118 return Bytes.beS2(code, curBCI + 4);
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119 }
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120 return Bytes.beS1(code, curBCI + 2);
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121 }
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122
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123 /**
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124 * Read the destination of a {@link Bytecodes#GOTO} or {@code IF} instructions.
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125 *
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126 * @return the destination bytecode index
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127 */
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128 public int readBranchDest() {
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129 // reads the destination for a branch bytecode
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130 if (opcode == Bytecodes.GOTO_W || opcode == Bytecodes.JSR_W) {
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131 return curBCI + Bytes.beS4(code, curBCI + 1);
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132 } else {
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133 return curBCI + Bytes.beS2(code, curBCI + 1);
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134 }
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135 }
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136
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137 /**
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138 * Read a signed 4-byte integer from the bytecode stream at the specified bytecode index.
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139 *
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140 * @param bci the bytecode index
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141 * @return the integer value
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142 */
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143 public int readInt(int bci) {
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144 // reads a 4-byte signed value
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145 return Bytes.beS4(code, bci);
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146 }
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147
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148 /**
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149 * Reads an unsigned, 1-byte value from the bytecode stream at the specified bytecode index.
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150 *
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151 * @param bci the bytecode index
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152 * @return the byte
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153 */
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154 public int readUByte(int bci) {
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155 return Bytes.beU1(code, bci);
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156 }
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157
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158 /**
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159 * Reads a constant pool index for the current instruction.
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160 *
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161 * @return the constant pool index
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162 */
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163 public char readCPI() {
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164 if (opcode == Bytecodes.LDC) {
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165 return (char) Bytes.beU1(code, curBCI + 1);
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166 }
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167 return (char) Bytes.beU2(code, curBCI + 1);
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168 }
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169
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170 /**
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171 * Reads a constant pool index for an invokedynamic instruction.
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172 *
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173 * @return the constant pool index
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174 */
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175 public int readCPI4() {
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176 assert opcode == Bytecodes.INVOKEDYNAMIC;
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177 return Bytes.beS4(code, curBCI + 1);
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178 }
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179
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180 /**
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181 * Reads a signed, 1-byte value for the current instruction (e.g. BIPUSH).
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182 *
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183 * @return the byte
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184 */
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185 public byte readByte() {
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186 return code[curBCI + 1];
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187 }
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188
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189 /**
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190 * Reads a signed, 2-byte short for the current instruction (e.g. SIPUSH).
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191 *
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192 * @return the short value
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193 */
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194 public short readShort() {
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195 return (short) Bytes.beS2(code, curBCI + 1);
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196 }
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197
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198 /**
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199 * Sets the bytecode index to the specified value. If {@code bci} is beyond the end of the
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200 * array, {@link #currentBC} will return {@link Bytecodes#END} and other methods may throw
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201 * {@link ArrayIndexOutOfBoundsException}.
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202 *
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203 * @param bci the new bytecode index
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204 */
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205 public void setBCI(int bci) {
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206 curBCI = bci;
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207 if (curBCI < code.length) {
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208 opcode = Bytes.beU1(code, bci);
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209 assert opcode < Bytecodes.BREAKPOINT : "illegal bytecode";
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210 nextBCI = bci + lengthOf();
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211 } else {
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212 opcode = Bytecodes.END;
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213 nextBCI = curBCI;
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214 }
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215 }
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216
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217 /**
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218 * Gets the length of the current bytecode.
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219 */
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220 private int lengthOf() {
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221 int length = Bytecodes.lengthOf(opcode);
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222 if (length == 0) {
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223 switch (opcode) {
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224 case Bytecodes.TABLESWITCH: {
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225 return new BytecodeTableSwitch(this, curBCI).size();
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226 }
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227 case Bytecodes.LOOKUPSWITCH: {
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228 return new BytecodeLookupSwitch(this, curBCI).size();
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229 }
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230 case Bytecodes.WIDE: {
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231 int opc = Bytes.beU1(code, curBCI + 1);
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232 if (opc == Bytecodes.RET) {
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233 return 4;
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234 } else if (opc == Bytecodes.IINC) {
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235 return 6;
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236 } else {
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237 return 4; // a load or store bytecode
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238 }
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239 }
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240 default:
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241 throw new Error("unknown variable-length bytecode: " + opcode);
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242 }
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243 }
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244 return length;
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245 }
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246 }