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annotate src/share/vm/ci/ciType.hpp @ 5274:e72dd6533eb9
documented importance of nmethod::_graal_compiled_method wrt code unloading and GC
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 23 Apr 2012 15:42:30 +0200 |
parents | f95d63e2154a |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CI_CITYPE_HPP |
26 #define SHARE_VM_CI_CITYPE_HPP | |
27 | |
28 #include "ci/ciObject.hpp" | |
29 #include "oops/klassOop.hpp" | |
30 | |
0 | 31 // ciType |
32 // | |
33 // This class represents either a class (T_OBJECT), array (T_ARRAY), | |
34 // or one of the primitive types such as T_INT. | |
35 class ciType : public ciObject { | |
36 CI_PACKAGE_ACCESS | |
37 friend class ciKlass; | |
38 friend class ciReturnAddress; | |
39 | |
40 private: | |
41 BasicType _basic_type; | |
42 | |
43 ciType(BasicType t); // for the primitive types only | |
44 ciType(KlassHandle k); // for subclasses (reference types) | |
45 ciType(ciKlass* klass); // for unloaded types | |
46 | |
47 const char* type_string() { return "ciType"; } | |
48 | |
49 void print_impl(outputStream* st); | |
50 | |
51 // Distinguished instances of primitive ciTypes.. | |
52 static ciType* _basic_types[T_CONFLICT+1]; | |
53 | |
54 public: | |
55 BasicType basic_type() const { return _basic_type; } | |
56 | |
57 // Returns true iff the types are identical, or if both are klasses | |
58 // and the is_subtype_of relation holds between the klasses. | |
59 bool is_subtype_of(ciType* type); | |
60 | |
61 // Get the instance of java.lang.Class corresponding to this type. | |
62 // There are mirrors for instance, array, and primitive types (incl. void). | |
63 virtual ciInstance* java_mirror(); | |
64 | |
65 // Get the class which "boxes" (or "wraps") values of this type. | |
66 // Example: short is boxed by java.lang.Short, etc. | |
67 // Returns self if it is a reference type. | |
68 // Returns NULL for void, since null is used in such cases. | |
69 ciKlass* box_klass(); | |
70 | |
71 // Returns true if this is not a klass or array (i.e., not a reference type). | |
72 bool is_primitive_type() const { return basic_type() != T_OBJECT && basic_type() != T_ARRAY; } | |
73 int size() const { return type2size[basic_type()]; } | |
74 bool is_void() const { return basic_type() == T_VOID; } | |
75 bool is_one_word() const { return size() == 1; } | |
76 bool is_two_word() const { return size() == 2; } | |
77 | |
78 // What kind of ciObject is this? | |
79 bool is_type() { return true; } | |
80 bool is_classless() const { return is_primitive_type(); } | |
81 | |
82 virtual void print_name_on(outputStream* st); | |
83 void print_name() { | |
84 print_name_on(tty); | |
85 } | |
86 | |
87 static ciType* make(BasicType t); | |
88 }; | |
89 | |
90 | |
91 // ciReturnAddress | |
92 // | |
93 // This class represents the type of a specific return address in the | |
94 // bytecodes. | |
95 class ciReturnAddress : public ciType { | |
96 CI_PACKAGE_ACCESS | |
97 | |
98 private: | |
99 // The bci of this return address. | |
100 int _bci; | |
101 | |
102 ciReturnAddress(int bci); | |
103 | |
104 const char* type_string() { return "ciReturnAddress"; } | |
105 | |
106 void print_impl(outputStream* st); | |
107 | |
108 public: | |
109 bool is_return_address() { return true; } | |
110 | |
111 int bci() { return _bci; } | |
112 | |
113 static ciReturnAddress* make(int bci); | |
114 }; | |
1972 | 115 |
116 #endif // SHARE_VM_CI_CITYPE_HPP |