1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /* 26 * This file is available under and governed by the GNU General Public 27 * License version 2 only, as published by the Free Software Foundation. 28 * However, the following notice accompanied the original version of this 29 * file: 30 * 31 * ASM: a very small and fast Java bytecode manipulation framework 32 * Copyright (c) 2000-2011 INRIA, France Telecom 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. Neither the name of the copyright holders nor the names of its 44 * contributors may be used to endorse or promote products derived from 45 * this software without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 57 * THE POSSIBILITY OF SUCH DAMAGE. 58 */ 59 package jdk.internal.org.objectweb.asm.commons; 60 61 import jdk.internal.org.objectweb.asm.Handle; 62 import jdk.internal.org.objectweb.asm.Label; 63 import jdk.internal.org.objectweb.asm.MethodVisitor; 64 import jdk.internal.org.objectweb.asm.Opcodes; 65 66 /** 67 * A {@link MethodVisitor} that can be used to approximate method size. 68 * 69 * @author Eugene Kuleshov 70 */ 71 public class CodeSizeEvaluator extends MethodVisitor implements Opcodes { 72 73 private int minSize; 74 75 private int maxSize; 76 77 public CodeSizeEvaluator(final MethodVisitor mv) { 78 this(Opcodes.ASM6, mv); 79 } 80 81 protected CodeSizeEvaluator(final int api, final MethodVisitor mv) { 82 super(api, mv); 83 } 84 85 public int getMinSize() { 86 return this.minSize; 87 } 88 89 public int getMaxSize() { 90 return this.maxSize; 91 } 92 93 @Override 94 public void visitInsn(final int opcode) { 95 minSize += 1; 96 maxSize += 1; 97 if (mv != null) { 98 mv.visitInsn(opcode); 99 } 100 } 101 102 @Override 103 public void visitIntInsn(final int opcode, final int operand) { 104 if (opcode == SIPUSH) { 105 minSize += 3; 106 maxSize += 3; 107 } else { 108 minSize += 2; 109 maxSize += 2; 110 } 111 if (mv != null) { 112 mv.visitIntInsn(opcode, operand); 113 } 114 } 115 116 @Override 117 public void visitVarInsn(final int opcode, final int var) { 118 if (var < 4 && opcode != RET) { 119 minSize += 1; 120 maxSize += 1; 121 } else if (var >= 256) { 122 minSize += 4; 123 maxSize += 4; 124 } else { 125 minSize += 2; 126 maxSize += 2; 127 } 128 if (mv != null) { 129 mv.visitVarInsn(opcode, var); 130 } 131 } 132 133 @Override 134 public void visitTypeInsn(final int opcode, final String type) { 135 minSize += 3; 136 maxSize += 3; 137 if (mv != null) { 138 mv.visitTypeInsn(opcode, type); 139 } 140 } 141 142 @Override 143 public void visitFieldInsn(final int opcode, final String owner, 144 final String name, final String desc) { 145 minSize += 3; 146 maxSize += 3; 147 if (mv != null) { 148 mv.visitFieldInsn(opcode, owner, name, desc); 149 } 150 } 151 152 @Deprecated 153 @Override 154 public void visitMethodInsn(final int opcode, final String owner, 155 final String name, final String desc) { 156 if (api >= Opcodes.ASM5) { 157 super.visitMethodInsn(opcode, owner, name, desc); 158 return; 159 } 160 doVisitMethodInsn(opcode, owner, name, desc, 161 opcode == Opcodes.INVOKEINTERFACE); 162 } 163 164 @Override 165 public void visitMethodInsn(final int opcode, final String owner, 166 final String name, final String desc, final boolean itf) { 167 if (api < Opcodes.ASM5) { 168 super.visitMethodInsn(opcode, owner, name, desc, itf); 169 return; 170 } 171 doVisitMethodInsn(opcode, owner, name, desc, itf); 172 } 173 174 private void doVisitMethodInsn(int opcode, final String owner, 175 final String name, final String desc, final boolean itf) { 176 if (opcode == INVOKEINTERFACE) { 177 minSize += 5; 178 maxSize += 5; 179 } else { 180 minSize += 3; 181 maxSize += 3; 182 } 183 if (mv != null) { 184 mv.visitMethodInsn(opcode, owner, name, desc, itf); 185 } 186 } 187 188 @Override 189 public void visitInvokeDynamicInsn(String name, String desc, Handle bsm, 190 Object... bsmArgs) { 191 minSize += 5; 192 maxSize += 5; 193 if (mv != null) { 194 mv.visitInvokeDynamicInsn(name, desc, bsm, bsmArgs); 195 } 196 } 197 198 @Override 199 public void visitJumpInsn(final int opcode, final Label label) { 200 minSize += 3; 201 if (opcode == GOTO || opcode == JSR) { 202 maxSize += 5; 203 } else { 204 maxSize += 8; 205 } 206 if (mv != null) { 207 mv.visitJumpInsn(opcode, label); 208 } 209 } 210 211 @Override 212 public void visitLdcInsn(final Object cst) { 213 if (cst instanceof Long || cst instanceof Double) { 214 minSize += 3; 215 maxSize += 3; 216 } else { 217 minSize += 2; 218 maxSize += 3; 219 } 220 if (mv != null) { 221 mv.visitLdcInsn(cst); 222 } 223 } 224 225 @Override 226 public void visitIincInsn(final int var, final int increment) { 227 if (var > 255 || increment > 127 || increment < -128) { 228 minSize += 6; 229 maxSize += 6; 230 } else { 231 minSize += 3; 232 maxSize += 3; 233 } 234 if (mv != null) { 235 mv.visitIincInsn(var, increment); 236 } 237 } 238 239 @Override 240 public void visitTableSwitchInsn(final int min, final int max, 241 final Label dflt, final Label... labels) { 242 minSize += 13 + labels.length * 4; 243 maxSize += 16 + labels.length * 4; 244 if (mv != null) { 245 mv.visitTableSwitchInsn(min, max, dflt, labels); 246 } 247 } 248 249 @Override 250 public void visitLookupSwitchInsn(final Label dflt, final int[] keys, 251 final Label[] labels) { 252 minSize += 9 + keys.length * 8; 253 maxSize += 12 + keys.length * 8; 254 if (mv != null) { 255 mv.visitLookupSwitchInsn(dflt, keys, labels); 256 } 257 } 258 259 @Override 260 public void visitMultiANewArrayInsn(final String desc, final int dims) { 261 minSize += 4; 262 maxSize += 4; 263 if (mv != null) { 264 mv.visitMultiANewArrayInsn(desc, dims); 265 } 266 } 267 }