1/*
2 * Copyright (c) 2002, 2012, 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
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.interpreter;
26
27import java.util.*;
28import java.lang.reflect.Constructor;
29import sun.jvm.hotspot.oops.*;
30import sun.jvm.hotspot.utilities.*;
31
32public class BytecodeDisassembler {
33   private Method method;
34
35   private static Map bytecode2Class = new HashMap(); // Map<int, Class>
36
37   private static void addBytecodeClass(int bytecode, Class clazz) {
38      bytecode2Class.put(new Integer(bytecode), clazz);
39   }
40
41   private static Class getBytecodeClass(int bytecode) {
42      return (Class) bytecode2Class.get(new Integer(bytecode));
43   }
44
45   static {
46      addBytecodeClass(Bytecodes._anewarray, BytecodeANewArray.class);
47      addBytecodeClass(Bytecodes._bipush, BytecodeBipush.class);
48      addBytecodeClass(Bytecodes._checkcast, BytecodeCheckCast.class);
49      addBytecodeClass(Bytecodes._getfield, BytecodeGetField.class);
50      addBytecodeClass(Bytecodes._getstatic, BytecodeGetStatic.class);
51      addBytecodeClass(Bytecodes._goto, BytecodeGoto.class);
52      addBytecodeClass(Bytecodes._goto_w, BytecodeGotoW.class);
53      addBytecodeClass(Bytecodes._ifeq, BytecodeIf.class);
54      addBytecodeClass(Bytecodes._ifne, BytecodeIf.class);
55      addBytecodeClass(Bytecodes._iflt, BytecodeIf.class);
56      addBytecodeClass(Bytecodes._ifge, BytecodeIf.class);
57      addBytecodeClass(Bytecodes._ifgt, BytecodeIf.class);
58      addBytecodeClass(Bytecodes._ifle, BytecodeIf.class);
59      addBytecodeClass(Bytecodes._if_icmpeq, BytecodeIf.class);
60      addBytecodeClass(Bytecodes._if_icmpne, BytecodeIf.class);
61      addBytecodeClass(Bytecodes._if_icmplt, BytecodeIf.class);
62      addBytecodeClass(Bytecodes._if_icmpge, BytecodeIf.class);
63      addBytecodeClass(Bytecodes._if_icmpgt, BytecodeIf.class);
64      addBytecodeClass(Bytecodes._if_icmple, BytecodeIf.class);
65      addBytecodeClass(Bytecodes._if_acmpeq, BytecodeIf.class);
66      addBytecodeClass(Bytecodes._if_acmpne, BytecodeIf.class);
67      addBytecodeClass(Bytecodes._ifnull, BytecodeIf.class);
68      addBytecodeClass(Bytecodes._ifnonnull, BytecodeIf.class);
69      addBytecodeClass(Bytecodes._iinc, BytecodeIinc.class);
70      addBytecodeClass(Bytecodes._instanceof, BytecodeInstanceOf.class);
71      addBytecodeClass(Bytecodes._invokevirtual, BytecodeInvoke.class);
72      addBytecodeClass(Bytecodes._invokestatic, BytecodeInvoke.class);
73      addBytecodeClass(Bytecodes._invokespecial, BytecodeInvoke.class);
74      addBytecodeClass(Bytecodes._invokeinterface, BytecodeInvoke.class);
75      addBytecodeClass(Bytecodes._invokedynamic, BytecodeInvoke.class);
76      addBytecodeClass(Bytecodes._jsr, BytecodeJsr.class);
77      addBytecodeClass(Bytecodes._jsr_w, BytecodeJsrW.class);
78      addBytecodeClass(Bytecodes._iload, BytecodeLoad.class);
79      addBytecodeClass(Bytecodes._lload, BytecodeLoad.class);
80      addBytecodeClass(Bytecodes._fload, BytecodeLoad.class);
81      addBytecodeClass(Bytecodes._dload, BytecodeLoad.class);
82      addBytecodeClass(Bytecodes._aload, BytecodeLoad.class);
83      addBytecodeClass(Bytecodes._ldc,   BytecodeLoadConstant.class);
84      addBytecodeClass(Bytecodes._ldc_w, BytecodeLoadConstant.class);
85      addBytecodeClass(Bytecodes._ldc2_w, BytecodeLoadConstant.class);
86      addBytecodeClass(Bytecodes._lookupswitch, BytecodeLookupswitch.class);
87      addBytecodeClass(Bytecodes._multianewarray, BytecodeMultiANewArray.class);
88      addBytecodeClass(Bytecodes._new, BytecodeNew.class);
89      addBytecodeClass(Bytecodes._newarray, BytecodeNewArray.class);
90      addBytecodeClass(Bytecodes._putfield, BytecodePutField.class);
91      addBytecodeClass(Bytecodes._putstatic, BytecodePutStatic.class);
92      addBytecodeClass(Bytecodes._ret, BytecodeRet.class);
93      addBytecodeClass(Bytecodes._sipush, BytecodeSipush.class);
94      addBytecodeClass(Bytecodes._istore, BytecodeStore.class);
95      addBytecodeClass(Bytecodes._lstore, BytecodeStore.class);
96      addBytecodeClass(Bytecodes._fstore, BytecodeStore.class);
97      addBytecodeClass(Bytecodes._dstore, BytecodeStore.class);
98      addBytecodeClass(Bytecodes._astore, BytecodeStore.class);
99      addBytecodeClass(Bytecodes._tableswitch, BytecodeTableswitch.class);
100   }
101
102   public BytecodeDisassembler(Method method) {
103      this.method = method;
104   }
105
106   public Method getMethod() {
107      return method;
108   }
109
110   public void decode(BytecodeVisitor visitor) {
111      visitor.prologue(method);
112
113      BytecodeStream stream = new BytecodeStream(method);
114      int javacode = Bytecodes._illegal;
115      while ( (javacode = stream.next()) != Bytecodes._illegal) {
116         // look for special Bytecode class
117         int bci = stream.bci();
118         int hotspotcode = method.getBytecodeOrBPAt(bci);
119         Class clazz = getBytecodeClass(javacode);
120         if (clazz == null) {
121            // check for fast_(i|a)_access_0
122            clazz = getBytecodeClass(hotspotcode);
123            if (clazz == null) {
124               // use generic bytecode class
125               clazz = Bytecode.class;
126            }
127         }
128
129         // All bytecode classes must have a constructor with signature
130         // (Lsun/jvm/hotspot/oops/Method;I)V
131
132         Constructor cstr = null;
133         try {
134            cstr = clazz.getDeclaredConstructor(new Class[] { Method.class, Integer.TYPE });
135         } catch(NoSuchMethodException nomethod) {
136            if (Assert.ASSERTS_ENABLED) {
137               Assert.that(false, "Bytecode class without proper constructor!");
138            }
139         }
140
141         Bytecode bytecodeObj = null;
142         try {
143            bytecodeObj = (Bytecode)cstr.newInstance(new Object[] { method, new Integer(bci) });
144         } catch (Exception exp) {
145            if (Assert.ASSERTS_ENABLED) {
146               Assert.that(false, "Bytecode instance of class "
147                           + clazz.getName() + " can not be created!");
148            }
149         }
150
151         if (stream.isWide()) {
152            visitor.visit(new Bytecode(method, bci - 1));
153         }
154
155         try {
156            visitor.visit(bytecodeObj);
157         } catch(ClassCastException castfail) {
158             castfail.printStackTrace();
159             System.err.println(method.getAddress() + " " + bci);
160         }
161      }
162
163      visitor.epilogue();
164   }
165}
166