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

comparison: src/share/classes/com/sun/tools/javap/LocalVariableTableWriter.java

src/share/classes/com/sun/tools/javap/LocalVariableTableWriter.java

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1 /*
2 * Copyright 2009 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.javap;
27
28 import com.sun.tools.classfile.Attribute;
29 import com.sun.tools.classfile.Code_attribute;
30 import com.sun.tools.classfile.ConstantPool;
31 import com.sun.tools.classfile.ConstantPoolException;
32 import com.sun.tools.classfile.Descriptor;
33 import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
34 import com.sun.tools.classfile.Instruction;
35 import com.sun.tools.classfile.LocalVariableTable_attribute;
36 import java.util.ArrayList;
37 import java.util.HashMap;
38 import java.util.List;
39 import java.util.ListIterator;
40 import java.util.Map;
41
42 /**
43 * Annotate instructions with details about local variables.
44 *
45 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
46 * you write code that depends on this, you do so at your own risk.
47 * This code and its internal interfaces are subject to change or
48 * deletion without notice.</b>
49 */
50 public class LocalVariableTableWriter extends InstructionDetailWriter {
51 public enum NoteKind {
52 START("start") {
53 public boolean match(LocalVariableTable_attribute.Entry entry, int pc) {
54 return (pc == entry.start_pc);
55 }
56 },
57 END("end") {
58 public boolean match(LocalVariableTable_attribute.Entry entry, int pc) {
59 return (pc == entry.start_pc + entry.length);
60 }
61 };
62 NoteKind(String text) {
63 this.text = text;
64 }
65 public abstract boolean match(LocalVariableTable_attribute.Entry entry, int pc);
66 public final String text;
67 };
68
69 static LocalVariableTableWriter instance(Context context) {
70 LocalVariableTableWriter instance = context.get(LocalVariableTableWriter.class);
71 if (instance == null)
72 instance = new LocalVariableTableWriter(context);
73 return instance;
74 }
75
76 protected LocalVariableTableWriter(Context context) {
77 super(context);
78 context.put(LocalVariableTableWriter.class, this);
79 classWriter = ClassWriter.instance(context);
80 }
81
82 public void reset(Code_attribute attr) {
83 codeAttr = attr;
84 pcMap = new HashMap<Integer, List<LocalVariableTable_attribute.Entry>>();
85 LocalVariableTable_attribute lvt =
86 (LocalVariableTable_attribute) (attr.attributes.get(Attribute.LocalVariableTable));
87 if (lvt == null)
88 return;
89
90 for (int i = 0; i < lvt.local_variable_table.length; i++) {
91 LocalVariableTable_attribute.Entry entry = lvt.local_variable_table[i];
92 put(entry.start_pc, entry);
93 put(entry.start_pc + entry.length, entry);
94 }
95 }
96
97 public void writeDetails(Instruction instr) {
98 int pc = instr.getPC();
99 writeLocalVariables(pc, NoteKind.END);
100 writeLocalVariables(pc, NoteKind.START);
101 }
102
103 @Override
104 public void flush() {
105 int pc = codeAttr.code_length;
106 writeLocalVariables(pc, NoteKind.END);
107 }
108
109 public void writeLocalVariables(int pc, NoteKind kind) {
110 ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
111 String indent = space(2); // get from Options?
112 List<LocalVariableTable_attribute.Entry> entries = pcMap.get(pc);
113 if (entries != null) {
114 for (ListIterator<LocalVariableTable_attribute.Entry> iter =
115 entries.listIterator(kind == NoteKind.END ? entries.size() : 0);
116 kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) {
117 LocalVariableTable_attribute.Entry entry =
118 kind == NoteKind.END ? iter.previous() : iter.next();
119 if (kind.match(entry, pc)) {
120 print(indent);
121 print(kind.text);
122 print(" local ");
123 print(entry.index);
124 print(" // ");
125 Descriptor d = new Descriptor(entry.descriptor_index);
126 try {
127 print(d.getFieldType(constant_pool));
128 } catch (InvalidDescriptor e) {
129 print(report(e));
130 } catch (ConstantPoolException e) {
131 print(report(e));
132 }
133 print(" ");
134 try {
135 print(constant_pool.getUTF8Value(entry.name_index));
136 } catch (ConstantPoolException e) {
137 print(report(e));
138 }
139 println();
140 }
141 }
142 }
143 }
144
145 private void put(int pc, LocalVariableTable_attribute.Entry entry) {
146 List<LocalVariableTable_attribute.Entry> list = pcMap.get(pc);
147 if (list == null) {
148 list = new ArrayList<LocalVariableTable_attribute.Entry>();
149 pcMap.put(pc, list);
150 }
151 if (!list.contains(entry))
152 list.add(entry);
153 }
154
155 private ClassWriter classWriter;
156 private Code_attribute codeAttr;
157 private Map<Integer, List<LocalVariableTable_attribute.Entry>> pcMap;
158 }

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