1 /*
2  * Copyright (c) 1995, 2003, Oracle and/or its affiliates. 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
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 
26 
27 package sun.tools.java;
28 
29 import java.io.*;
30 
31 /**
32  * WARNING: The contents of this source file are not part of any
33  * supported API.  Code that depends on them does so at its own risk:
34  * they are subject to change or removal without notice.
35  */
36 public class BinaryCode implements Constants {
37     int maxStack;               // maximum stack used by code
38     int maxLocals;              // maximum locals used by code
39     BinaryExceptionHandler exceptionHandlers[];
40     BinaryAttribute atts;       // code attributes
41     BinaryConstantPool cpool;   // constant pool of the class
42     byte code[];                // the byte code
43 
44     /**
45      * Construct the binary code from the code attribute
46      */
47 
48     public
BinaryCode(byte data[], BinaryConstantPool cpool, Environment env)49     BinaryCode(byte data[], BinaryConstantPool cpool, Environment env) {
50         DataInputStream in = new DataInputStream(new ByteArrayInputStream(data));
51         try {
52             this.cpool = cpool;
53             // JVM 4.7.4 CodeAttribute.max_stack
54             this.maxStack = in.readUnsignedShort();
55             // JVM 4.7.4 CodeAttribute.max_locals
56             this.maxLocals = in.readUnsignedShort();
57             // JVM 4.7.4 CodeAttribute.code_length
58             int code_length = in.readInt();
59             this.code = new byte[code_length];
60             // JVM 4.7.4 CodeAttribute.code[]
61             in.read(this.code);
62             // JVM 4.7.4 CodeAttribute.exception_table_length
63             int exception_count = in.readUnsignedShort();
64             this.exceptionHandlers = new BinaryExceptionHandler[exception_count];
65             for (int i = 0; i < exception_count; i++) {
66                 // JVM 4.7.4 CodeAttribute.exception_table.start_pc
67                 int start = in.readUnsignedShort();
68                 // JVM 4.7.4 CodeAttribute.exception_table.end_pc
69                 int end = in.readUnsignedShort();
70                 // JVM 4.7.4 CodeAttribute.exception_table.handler_pc
71                 int handler = in.readUnsignedShort();
72                 // JVM 4.7.4 CodeAttribute.exception_table.catch_type
73                 ClassDeclaration xclass = cpool.getDeclaration(env, in.readUnsignedShort());
74                 this.exceptionHandlers[i]  =
75                     new BinaryExceptionHandler(start, end, handler, xclass);
76             }
77             this.atts = BinaryAttribute.load(in, cpool, ~0);
78             if (in.available() != 0) {
79                 System.err.println("Should have exhausted input stream!");
80             }
81         } catch (IOException e) {
82             throw new CompilerError(e);
83         }
84     }
85 
86 
87     /**
88      * Accessors
89      */
90 
getExceptionHandlers()91     public BinaryExceptionHandler getExceptionHandlers()[] {
92         return exceptionHandlers;
93     }
94 
getCode()95     public byte getCode()[] { return code; }
96 
getMaxStack()97     public int getMaxStack() { return maxStack; }
98 
getMaxLocals()99     public int getMaxLocals() { return maxLocals; }
100 
getAttributes()101     public BinaryAttribute getAttributes() { return atts; }
102 
103     /**
104      * Load a binary class
105      */
106     public static
load(BinaryMember bf, BinaryConstantPool cpool, Environment env)107     BinaryCode load(BinaryMember bf, BinaryConstantPool cpool, Environment env) {
108         byte code[] = bf.getAttribute(idCode);
109         return (code != null) ? new BinaryCode(code, cpool, env) : null;
110     }
111 }
112