Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: src/share/classes/com/sun/tools/classfile/StackMapTable_attribute.java

src/share/classes/com/sun/tools/classfile/StackMapTable_attribute.java

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1 /*
2 * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package com.sun.tools.classfile;
27
28 import java.io.IOException;
29
30 /**
31 * See JVMS3, section 4.8.4.
32 *
33 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
34 * you write code that depends on this, you do so at your own risk.
35 * This code and its internal interfaces are subject to change or
36 * deletion without notice.</b>
37 */
38 public class StackMapTable_attribute extends Attribute {
39 static class InvalidStackMap extends AttributeException {
40 InvalidStackMap(String msg) {
41 super(msg);
42 }
43 }
44
45 StackMapTable_attribute(ClassReader cr, int name_index, int length)
46 throws IOException, InvalidStackMap {
47 super(name_index, length);
48 number_of_entries = cr.readUnsignedShort();
49 entries = new stack_map_frame[number_of_entries];
50 for (int i = 0; i < number_of_entries; i++)
51 entries[i] = stack_map_frame.read(cr);
52 }
53
54 public StackMapTable_attribute(ConstantPool constant_pool, stack_map_frame[] entries)
55 throws ConstantPoolException {
56 this(constant_pool.getUTF8Index(Attribute.StackMapTable), entries);
57 }
58
59 public StackMapTable_attribute(int name_index, stack_map_frame[] entries) {
60 super(name_index, length(entries));
61 this.number_of_entries = entries.length;
62 this.entries = entries;
63 }
64
65 public <R, D> R accept(Visitor<R, D> visitor, D data) {
66 return visitor.visitStackMapTable(this, data);
67 }
68
69 static int length(stack_map_frame[] entries) {
70 int n = 2;
71 for (stack_map_frame entry: entries)
72 n += entry.length();
73 return n;
74 }
75
76 public final int number_of_entries;
77 public final stack_map_frame entries[];
78
79 public static abstract class stack_map_frame {
80 static stack_map_frame read(ClassReader cr)
81 throws IOException, InvalidStackMap {
82 int frame_type = cr.readUnsignedByte();
83 if (frame_type <= 63)
84 return new same_frame(frame_type);
85 else if (frame_type <= 127)
86 return new same_locals_1_stack_item_frame(frame_type, cr);
87 else if (frame_type <= 246)
88 throw new Error("unknown frame_type " + frame_type);
89 else if (frame_type == 247)
90 return new same_locals_1_stack_item_frame_extended(frame_type, cr);
91 else if (frame_type <= 250)
92 return new chop_frame(frame_type, cr);
93 else if (frame_type == 251)
94 return new same_frame_extended(frame_type, cr);
95 else if (frame_type <= 254)
96 return new append_frame(frame_type, cr);
97 else
98 return new full_frame(frame_type, cr);
99 }
100
101 protected stack_map_frame(int frame_type) {
102 this.frame_type = frame_type;
103 }
104
105 public int length() {
106 return 1;
107 }
108
109 public abstract <R,D> R accept(Visitor<R,D> visitor, D data);
110
111 public final int frame_type;
112
113 public static interface Visitor<R,P> {
114 R visit_same_frame(same_frame frame, P p);
115 R visit_same_locals_1_stack_item_frame(same_locals_1_stack_item_frame frame, P p);
116 R visit_same_locals_1_stack_item_frame_extended(same_locals_1_stack_item_frame_extended frame, P p);
117 R visit_chop_frame(chop_frame frame, P p);
118 R visit_same_frame_extended(same_frame_extended frame, P p);
119 R visit_append_frame(append_frame frame, P p);
120 R visit_full_frame(full_frame frame, P p);
121 }
122 }
123
124 public static class same_frame extends stack_map_frame {
125 same_frame(int frame_type) {
126 super(frame_type);
127 }
128
129 public <R, D> R accept(Visitor<R, D> visitor, D data) {
130 return visitor.visit_same_frame(this, data);
131 }
132 }
133
134 public static class same_locals_1_stack_item_frame extends stack_map_frame {
135 same_locals_1_stack_item_frame(int frame_type, ClassReader cr)
136 throws IOException, InvalidStackMap {
137 super(frame_type);
138 stack = new verification_type_info[1];
139 stack[0] = verification_type_info.read(cr);
140 }
141
142 @Override
143 public int length() {
144 return super.length() + stack[0].length();
145 }
146
147 public <R, D> R accept(Visitor<R, D> visitor, D data) {
148 return visitor.visit_same_locals_1_stack_item_frame(this, data);
149 }
150
151 public final verification_type_info[] stack;
152 }
153
154 public static class same_locals_1_stack_item_frame_extended extends stack_map_frame {
155 same_locals_1_stack_item_frame_extended(int frame_type, ClassReader cr)
156 throws IOException, InvalidStackMap {
157 super(frame_type);
158 offset_delta = cr.readUnsignedShort();
159 stack = new verification_type_info[1];
160 stack[0] = verification_type_info.read(cr);
161 }
162
163 @Override
164 public int length() {
165 return super.length() + 2 + stack[0].length();
166 }
167
168 public <R, D> R accept(Visitor<R, D> visitor, D data) {
169 return visitor.visit_same_locals_1_stack_item_frame_extended(this, data);
170 }
171
172 public final int offset_delta;
173 public final verification_type_info[] stack;
174 }
175
176 public static class chop_frame extends stack_map_frame {
177 chop_frame(int frame_type, ClassReader cr) throws IOException {
178 super(frame_type);
179 offset_delta = cr.readUnsignedShort();
180 }
181
182 @Override
183 public int length() {
184 return super.length() + 2;
185 }
186
187 public <R, D> R accept(Visitor<R, D> visitor, D data) {
188 return visitor.visit_chop_frame(this, data);
189 }
190
191 public final int offset_delta;
192 }
193
194 public static class same_frame_extended extends stack_map_frame {
195 same_frame_extended(int frame_type, ClassReader cr) throws IOException {
196 super(frame_type);
197 offset_delta = cr.readUnsignedShort();
198 }
199
200 @Override
201 public int length() {
202 return super.length() + 2;
203 }
204
205 public <R, D> R accept(Visitor<R, D> visitor, D data) {
206 return visitor.visit_same_frame_extended(this, data);
207 }
208
209 public final int offset_delta;
210 }
211
212 public static class append_frame extends stack_map_frame {
213 append_frame(int frame_type, ClassReader cr)
214 throws IOException, InvalidStackMap {
215 super(frame_type);
216 offset_delta = cr.readUnsignedShort();
217 locals = new verification_type_info[frame_type - 251];
218 for (int i = 0; i < locals.length; i++)
219 locals[i] = verification_type_info.read(cr);
220 }
221
222 @Override
223 public int length() {
224 int n = super.length() + 2;
225 for (verification_type_info local: locals)
226 n += local.length();
227 return n;
228 }
229
230 public <R, D> R accept(Visitor<R, D> visitor, D data) {
231 return visitor.visit_append_frame(this, data);
232 }
233
234 public final int offset_delta;
235 public final verification_type_info[] locals;
236 }
237
238 public static class full_frame extends stack_map_frame {
239 full_frame(int frame_type, ClassReader cr)
240 throws IOException, InvalidStackMap {
241 super(frame_type);
242 offset_delta = cr.readUnsignedShort();
243 number_of_locals = cr.readUnsignedShort();
244 locals = new verification_type_info[number_of_locals];
245 for (int i = 0; i < locals.length; i++)
246 locals[i] = verification_type_info.read(cr);
247 number_of_stack_items = cr.readUnsignedShort();
248 stack = new verification_type_info[number_of_stack_items];
249 for (int i = 0; i < stack.length; i++)
250 stack[i] = verification_type_info.read(cr);
251 }
252
253 @Override
254 public int length() {
255 int n = super.length() + 2;
256 for (verification_type_info local: locals)
257 n += local.length();
258 n += 2;
259 for (verification_type_info item: stack)
260 n += item.length();
261 return n;
262 }
263
264 public <R, D> R accept(Visitor<R, D> visitor, D data) {
265 return visitor.visit_full_frame(this, data);
266 }
267
268 public final int offset_delta;
269 public final int number_of_locals;
270 public final verification_type_info[] locals;
271 public final int number_of_stack_items;
272 public final verification_type_info[] stack;
273 }
274
275 public static class verification_type_info {
276 public static final int ITEM_Top = 0;
277 public static final int ITEM_Integer = 1;
278 public static final int ITEM_Float = 2;
279 public static final int ITEM_Long = 4;
280 public static final int ITEM_Double = 3;
281 public static final int ITEM_Null = 5;
282 public static final int ITEM_UninitializedThis = 6;
283 public static final int ITEM_Object = 7;
284 public static final int ITEM_Uninitialized = 8;
285
286 static verification_type_info read(ClassReader cr)
287 throws IOException, InvalidStackMap {
288 int tag = cr.readUnsignedByte();
289 switch (tag) {
290 case ITEM_Top:
291 case ITEM_Integer:
292 case ITEM_Float:
293 case ITEM_Long:
294 case ITEM_Double:
295 case ITEM_Null:
296 case ITEM_UninitializedThis:
297 return new verification_type_info(tag);
298
299 case ITEM_Object:
300 return new Object_variable_info(cr);
301
302 case ITEM_Uninitialized:
303 return new Uninitialized_variable_info(cr);
304
305 default:
306 throw new InvalidStackMap("unrecognized verification_type_info tag");
307 }
308 }
309
310 verification_type_info(int tag) {
311 this.tag = tag;
312 }
313
314 public int length() {
315 return 1;
316 }
317
318 public final int tag;
319 }
320
321 public static class Object_variable_info extends verification_type_info {
322 Object_variable_info(ClassReader cr) throws IOException {
323 super(ITEM_Object);
324 cpool_index = cr.readUnsignedShort();
325 }
326
327 @Override
328 public int length() {
329 return super.length() + 2;
330 }
331
332 public final int cpool_index;
333 }
334
335 public static class Uninitialized_variable_info extends verification_type_info {
336 Uninitialized_variable_info(ClassReader cr) throws IOException {
337 super(ITEM_Uninitialized);
338 offset = cr.readUnsignedShort();
339 }
340
341 @Override
342 public int length() {
343 return super.length() + 2;
344 }
345
346 public final int offset;
347
348 }
349 }

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