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.ASM4, 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(
144 final int opcode,
145 final String owner,
146 final String name,
147 final String desc)
148 {
149 minSize += 3;
150 maxSize += 3;
151 if (mv != null) {
152 mv.visitFieldInsn(opcode, owner, name, desc);
153 }
154 }
155
156 @Override
157 public void visitMethodInsn(
158 final int opcode,
159 final String owner,
160 final String name,
161 final String desc)
162 {
163 if (opcode == INVOKEINTERFACE) {
164 minSize += 5;
165 maxSize += 5;
166 } else {
167 minSize += 3;
168 maxSize += 3;
169 }
170 if (mv != null) {
171 mv.visitMethodInsn(opcode, owner, name, desc);
172 }
173 }
174
175 @Override
176 public void visitInvokeDynamicInsn(
177 String name,
178 String desc,
179 Handle bsm,
180 Object... bsmArgs)
181 {
182 minSize += 5;
183 maxSize += 5;
184 if (mv != null) {
185 mv.visitInvokeDynamicInsn(name, desc, bsm, bsmArgs);
186 }
187 }
188
189 @Override
190 public void visitJumpInsn(final int opcode, final Label label) {
191 minSize += 3;
192 if (opcode == GOTO || opcode == JSR) {
193 maxSize += 5;
194 } else {
195 maxSize += 8;
196 }
197 if (mv != null) {
198 mv.visitJumpInsn(opcode, label);
199 }
200 }
201
202 @Override
203 public void visitLdcInsn(final Object cst) {
204 if (cst instanceof Long || cst instanceof Double) {
205 minSize += 3;
206 maxSize += 3;
207 } else {
208 minSize += 2;
209 maxSize += 3;
210 }
211 if (mv != null) {
212 mv.visitLdcInsn(cst);
213 }
214 }
215
216 @Override
217 public void visitIincInsn(final int var, final int increment) {
218 if (var > 255 || increment > 127 || increment < -128) {
219 minSize += 6;
220 maxSize += 6;
221 } else {
222 minSize += 3;
223 maxSize += 3;
224 }
225 if (mv != null) {
226 mv.visitIincInsn(var, increment);
227 }
228 }
229
230 @Override
231 public void visitTableSwitchInsn(
232 final int min,
233 final int max,
234 final Label dflt,
235 final Label... labels)
236 {
237 minSize += 13 + labels.length * 4;
238 maxSize += 16 + labels.length * 4;
239 if (mv != null) {
240 mv.visitTableSwitchInsn(min, max, dflt, labels);
241 }
242 }
243
244 @Override
245 public void visitLookupSwitchInsn(
246 final Label dflt,
247 final int[] keys,
248 final Label[] labels)
249 {
250 minSize += 9 + keys.length * 8;
251 maxSize += 12 + keys.length * 8;
252 if (mv != null) {
253 mv.visitLookupSwitchInsn(dflt, keys, labels);
254 }
255 }
256
257 @Override
258 public void visitMultiANewArrayInsn(final String desc, final int dims) {
259 minSize += 4;
260 maxSize += 4;
261 if (mv != null) {
262 mv.visitMultiANewArrayInsn(desc, dims);
263 }
264 }
265 }