Mercurial > hg > graal-jvmci-8

annotate graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeStream.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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3733
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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.cri.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
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27 * simpler and less error prone. For example, it handles the {@link Bytecodes#WIDE} instruction
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28 * and wide variants of 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 * @param code the array of bytes that contains the bytecode
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40 */
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41 public BytecodeStream(byte[] code) {
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42 assert code != null;
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43 this.code = code;
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44 setBCI(0);
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45 }
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46
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47 /**
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48 * Advances to the next bytecode.
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49 */
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50 public void next() {
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51 setBCI(nextBCI);
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52 }
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53
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54 /**
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55 * Gets the next bytecode index (no side-effects).
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56 * @return the next bytecode index
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57 */
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58 public int nextBCI() {
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59 return nextBCI;
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60 }
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61
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62 /**
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63 * Gets the current bytecode index.
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64 * @return the current bytecode index
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65 */
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66 public int currentBCI() {
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67 return curBCI;
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68 }
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69
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70 /**
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71 * Gets the bytecode index of the end of the code.
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72 * @return the index of the end of the code
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73 */
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74 public int endBCI() {
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75 return code.length;
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76 }
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77
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78 /**
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79 * Gets the current opcode. This method will never return the
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80 * {@link Bytecodes#WIDE WIDE} opcode, but will instead
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81 * return the opcode that is modified by the {@code WIDE} opcode.
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82 * @return the current opcode; {@link Bytecodes#END} if at or beyond the end of the code
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83 */
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84 public int currentBC() {
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85 if (opcode == Bytecodes.WIDE) {
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86 return Bytes.beU1(code, curBCI + 1);
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87 } else {
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88 return opcode;
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89 }
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90 }
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91
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92 /**
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93 * Reads the index of a local variable for one of the load or store instructions.
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94 * The WIDE modifier is handled internally.
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95 * @return the index of the local variable
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96 */
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97 public int readLocalIndex() {
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98 // read local variable index for load/store
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99 if (opcode == Bytecodes.WIDE) {
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100 return Bytes.beU2(code, curBCI + 2);
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101 }
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102 return Bytes.beU1(code, curBCI + 1);
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103 }
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104
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105 /**
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106 * Read the delta for an {@link Bytecodes#IINC} bytecode.
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107 * @return the delta for the {@code IINC}
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108 */
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109 public int readIncrement() {
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110 // read the delta for the iinc bytecode
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111 if (opcode == Bytecodes.WIDE) {
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112 return Bytes.beS2(code, curBCI + 4);
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113 }
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114 return Bytes.beS1(code, curBCI + 2);
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115 }
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116
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117 /**
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118 * Read the destination of a {@link Bytecodes#GOTO} or {@code IF} instructions.
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119 * @return the destination bytecode index
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120 */
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121 public int readBranchDest() {
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122 // reads the destination for a branch bytecode
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123 return curBCI + Bytes.beS2(code, curBCI + 1);
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124 }
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125
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126 /**
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127 * Read the destination of a {@link Bytecodes#GOTO_W} or {@link Bytecodes#JSR_W} instructions.
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128 * @return the destination bytecode index
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129 */
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130 public int readFarBranchDest() {
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131 // reads the destination for a wide branch bytecode
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132 return curBCI + Bytes.beS4(code, curBCI + 1);
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133 }
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134
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135 /**
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136 * Read a signed 4-byte integer from the bytecode stream at the specified bytecode index.
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137 * @param bci the bytecode index
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138 * @return the integer value
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139 */
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140 public int readInt(int bci) {
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141 // reads a 4-byte signed value
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142 return Bytes.beS4(code, bci);
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143 }
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144
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145 /**
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146 * Reads an unsigned, 1-byte value from the bytecode stream at the specified bytecode index.
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147 * @param bci the bytecode index
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148 * @return the byte
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149 */
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150 public int readUByte(int bci) {
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151 return Bytes.beU1(code, bci);
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152 }
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153
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154 /**
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155 * Reads a constant pool index for the current instruction.
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156 * @return the constant pool index
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157 */
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158 public char readCPI() {
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159 if (opcode == Bytecodes.LDC) {
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160 return (char) Bytes.beU1(code, curBCI + 1);
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161 }
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162 return (char) Bytes.beU2(code, curBCI + 1);
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163 }
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164
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165 /**
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166 * Reads a signed, 1-byte value for the current instruction (e.g. BIPUSH).
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167 * @return the byte
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168 */
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169 public byte readByte() {
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170 return code[curBCI + 1];
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171 }
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172
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173 /**
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174 * Reads a signed, 2-byte short for the current instruction (e.g. SIPUSH).
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175 * @return the short value
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176 */
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177 public short readShort() {
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178 return (short) Bytes.beS2(code, curBCI + 1);
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179 }
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180
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181 /**
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182 * Sets the bytecode index to the specified value.
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183 * If {@code bci} is beyond the end of the array, {@link #currentBC} will return
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184 * {@link Bytecodes#END} and other methods may throw {@link ArrayIndexOutOfBoundsException}.
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185 * @param bci the new bytecode index
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186 */
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187 public void setBCI(int bci) {
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188 curBCI = bci;
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189 if (curBCI < code.length) {
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190 opcode = Bytes.beU1(code, bci);
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191 nextBCI = bci + Bytecodes.lengthOf(code, bci);
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192 } else {
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193 opcode = Bytecodes.END;
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194 nextBCI = curBCI;
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195 }
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196 }
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197 }