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comparison agent/src/share/classes/sun/jvm/hotspot/types/TypeDataBase.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000-2004 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.
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.types;
26
27 import java.util.Iterator;
28 import sun.jvm.hotspot.debugger.Address;
29
30 public interface TypeDataBase {
31 /** Equivalent to lookupType(cTypeName, true) */
32 public Type lookupType(String cTypeName);
33
34 /** For simplicity of the initial implementation, this is not
35 guaranteed to work for primitive types. If throwException is
36 true, throws an (unspecified) run-time exception if the type is
37 not found. */
38 public Type lookupType(String cTypeName, boolean throwException);
39
40 /** Equivalent to lookupIntConstant(constantName, true) */
41 public Integer lookupIntConstant(String constantName);
42
43 /* For convenience, this interface also encapsulates the fetching of
44 integer constants, i.e., enums. If no constant of this name was
45 present, either throws an (unspecified) run-time exception or
46 returns null. */
47 public Integer lookupIntConstant(String constantName, boolean throwException);
48
49 /** Equivalent to lookupLongConstant(constantName, true) */
50 public Long lookupLongConstant(String constantName);
51
52 /* For convenience, this interface also encapsulates the fetching of
53 long constants (those requiring 64 bits on 64-bit platforms). If
54 no constant of this name was present, either throws an
55 (unspecified) run-time exception or returns null. */
56 public Long lookupLongConstant(String constantName, boolean throwException);
57
58 /** Accessors for types representing the Java primitive types; used
59 for both proper type checking and for walking down Java arrays. */
60 public Type getJBooleanType();
61 public Type getJByteType();
62 public Type getJCharType();
63 public Type getJDoubleType();
64 public Type getJFloatType();
65 public Type getJIntType();
66 public Type getJLongType();
67 public Type getJShortType();
68
69 /** Returns the size of a C address in bytes. This is currently
70 needed in order to properly traverse an array of pointers.
71 Traversing an array of structs, for example, is possible by
72 looking up the type of the struct and multiplying the index by
73 its size when indexing off of a base Address. (FIXME: what about
74 alignment?) */
75 public long getAddressSize();
76
77 /** Returns the size of an oop in bytes. This is currently needed in
78 order to properly traverse an array of oops; it is distinguished
79 from the address size, above, because object pointers could
80 conceivably have a different representation than direct
81 pointers. Traversing an array of structs, for example, is
82 possible by looking up the type of the struct and multiplying
83 the index by its size when indexing off of a base Address. */
84 public long getOopSize();
85
86 /** <P> This is an experimental interface emulating C++'s run-time
87 type information (RTTI) mechanism: determines whether the given
88 address is a pointer to the start of a C++ object of precisely
89 the given type -- it does not search superclasses of the type.
90 The convention is that this returns false for the null pointer.
91 It is needed to allow wrapper Java objects of the appropriate
92 type to be constructed for existing C++ objects of polymorphic
93 type. This method is only intended to work for C++ types
94 (implying that we should rename this package and the classes
95 contained within back to "ctypes"). Further, since the vptr
96 offset in an object is known at compile time but not necessarily
97 at runtime (unless debugging information is available), it is
98 reasonable for an implementation of this method to search nearby
99 memory for the (known) vtbl value for the given type. For this
100 reason, this method is not intended to support scans through
101 memory finding C++ objects, but is instead targeted towards
102 discovering the true type of a pointer assumed to be
103 intact. </P>
104
105 <P> The reason this method was placed in the type database is
106 that the latter is the first level at which it could be exposed,
107 and placing it here could avoid modifying the Type interface. It
108 is unclear what other, if any, vtbl access would be useful (or
109 implementable), so we are trying to avoid changing interfaces at
110 this point to support this kind of functionality. </P>
111
112 <P> This method necessarily does not support multiple
113 inheritance. </P> */
114 public boolean addressTypeIsEqualToType(Address addr, Type type);
115
116 /** Helper routine for guessing the most derived type of a
117 polymorphic C++ object. Iterates the type database calling
118 addressTypeIsEqualToType for all known types. Returns a matching
119 Type for the given address if one was found, or null if none was
120 found. */
121 public Type guessTypeForAddress(Address addr);
122
123 /** Returns an Iterator over the Types in the database. */
124 public Iterator getTypes();
125
126 /** Returns an Iterator over the String names of the integer
127 constants in the database. */
128 public Iterator getIntConstants();
129
130 /** Returns an Iterator over the String names of the long constants
131 in the database. */
132 public Iterator getLongConstants();
133 }