J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2003 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 | |
| 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 |
| 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 | |
| 91 | public BinaryExceptionHandler getExceptionHandlers()[] { |
| 92 | return exceptionHandlers; |
| 93 | } |
| 94 | |
| 95 | public byte getCode()[] { return code; } |
| 96 | |
| 97 | public int getMaxStack() { return maxStack; } |
| 98 | |
| 99 | public int getMaxLocals() { return maxLocals; } |
| 100 | |
| 101 | public BinaryAttribute getAttributes() { return atts; } |
| 102 | |
| 103 | /** |
| 104 | * Load a binary class |
| 105 | */ |
| 106 | public static |
| 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 | } |