1 /*
2 * Copyright (c) 1997, 2009, 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
25 // Class Reflection contains utility methods needed for implementing the
26 // reflection api.
27 //
28 // Used by functions in the JVM interface.
29 //
30 // NOTE that in JDK 1.4 most of reflection is now implemented in Java
31 // using dynamic bytecode generation. The Array class has not yet been
32 // rewritten using bytecodes; if it were, most of the rest of this
33 // class could go away, as well as a few more entry points in jvm.cpp.
34
35 class FieldStream;
36
37 class Reflection: public AllStatic {
38 private:
39 // Access checking
40 static bool reflect_check_access(klassOop field_class, AccessFlags acc, klassOop target_class, bool is_method_invoke, TRAPS);
41
42 // Conversion
43 static klassOop basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS);
44 static oop basic_type_arrayklass_to_mirror(klassOop basic_type_arrayklass, TRAPS);
45
46 static objArrayHandle get_parameter_types(methodHandle method, int parameter_count, oop* return_type, TRAPS);
47 static objArrayHandle get_exception_types(methodHandle method, TRAPS);
48 // Creating new java.lang.reflect.xxx wrappers
49 static Handle new_type(symbolHandle signature, KlassHandle k, TRAPS);
50
51 public:
52 // Constants defined by java reflection api classes
53 enum SomeConstants {
54 PUBLIC = 0,
55 DECLARED = 1,
56 MEMBER_PUBLIC = 0,
57 MEMBER_DECLARED = 1,
58 MAX_DIM = 255
59 };
60
61 // Boxing. Returns boxed value of appropriate type. Throws IllegalArgumentException.
62 static oop box(jvalue* v, BasicType type, TRAPS);
63 // Unboxing. Returns type code and sets value.
64 static BasicType unbox_for_primitive(oop boxed_value, jvalue* value, TRAPS);
65 static BasicType unbox_for_regular_object(oop boxed_value, jvalue* value);
66
67 // Widening of basic types. Throws IllegalArgumentException.
68 static void widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS);
69
70 // Reflective array access. Returns type code. Throws ArrayIndexOutOfBoundsException.
71 static BasicType array_get(jvalue* value, arrayOop a, int index, TRAPS);
72 static void array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS);
73 // Returns mirror on array element type (NULL for basic type arrays and non-arrays).
74 static oop array_component_type(oop mirror, TRAPS);
75
76 // Object creation
77 static arrayOop reflect_new_array(oop element_mirror, jint length, TRAPS);
78 static arrayOop reflect_new_multi_array(oop element_mirror, typeArrayOop dimensions, TRAPS);
79
80 // Verification
81 static bool verify_class_access(klassOop current_class, klassOop new_class, bool classloader_only);
82
83 static bool verify_field_access(klassOop current_class,
84 klassOop resolved_class,
85 klassOop field_class,
86 AccessFlags access,
87 bool classloader_only,
88 bool protected_restriction = false);
89 static bool is_same_class_package(klassOop class1, klassOop class2);
90 static bool is_same_package_member(klassOop class1, klassOop class2, TRAPS);
91
92 static bool can_relax_access_check_for(
93 klassOop accessor, klassOop accesee, bool classloader_only);
94
95 // inner class reflection
96 // raise an ICCE unless the required relationship can be proven to hold
97 // If inner_is_member, require the inner to be a member of the outer.
98 // If !inner_is_member, require the inner to be anonymous (a non-member).
99 // Caller is responsible for figuring out in advance which case must be true.
100 static void check_for_inner_class(instanceKlassHandle outer, instanceKlassHandle inner,
101 bool inner_is_member, TRAPS);
102
103 //
104 // Support for reflection based on dynamic bytecode generation (JDK 1.4)
105 //
106
107 // Create a java.lang.reflect.Method object based on a method
108 static oop new_method(methodHandle method, bool intern_name, bool for_constant_pool_access, TRAPS);
109 // Create a java.lang.reflect.Constructor object based on a method
110 static oop new_constructor(methodHandle method, TRAPS);
111 // Create a java.lang.reflect.Field object based on a field descriptor
112 static oop new_field(fieldDescriptor* fd, bool intern_name, TRAPS);
113
114 //---------------------------------------------------------------------------
115 //
116 // Support for old native code-based reflection (pre-JDK 1.4)
117 //
118 // NOTE: the method and constructor invocation code is still used
119 // for startup time reasons; see reflectionCompat.hpp.
120 //
121 //---------------------------------------------------------------------------
122
123 #ifdef SUPPORT_OLD_REFLECTION
124 private:
125 // method resolution for invoke
126 static methodHandle resolve_interface_call(instanceKlassHandle klass, methodHandle method, KlassHandle recv_klass, Handle receiver, TRAPS);
127 // Method call (shared by invoke_method and invoke_constructor)
128 static oop invoke(instanceKlassHandle klass, methodHandle method, Handle receiver, bool override, objArrayHandle ptypes, BasicType rtype, objArrayHandle args, bool is_method_invoke, TRAPS);
129
130 // Narrowing of basic types. Used to create correct jvalues for
131 // boolean, byte, char and short return return values from interpreter
132 // which are returned as ints. Throws IllegalArgumentException.
133 static void narrow(jvalue* value, BasicType narrow_type, TRAPS);
134
135 // Conversion
136 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror, TRAPS);
137
138 static bool match_parameter_types(methodHandle method, objArrayHandle types, int parameter_count, TRAPS);
139 // Creating new java.lang.reflect.xxx wrappers
140 static oop new_field(FieldStream* st, TRAPS);
141
142 public:
143 // Field lookup and verification.
144 static bool resolve_field(Handle field_mirror, Handle& receiver, fieldDescriptor* fd, bool check_final, TRAPS);
145
146 // Reflective field access. Returns type code. Throws IllegalArgumentException.
147 static BasicType field_get(jvalue* value, fieldDescriptor* fd, Handle receiver);
148 static void field_set(jvalue* value, fieldDescriptor* fd, Handle receiver, BasicType value_type, TRAPS);
149
150 // Reflective lookup of fields. Returns java.lang.reflect.Field instances.
151 static oop reflect_field(oop mirror, symbolOop field_name, jint which, TRAPS);
152 static objArrayOop reflect_fields(oop mirror, jint which, TRAPS);
153
154 // Reflective lookup of methods. Returns java.lang.reflect.Method instances.
155 static oop reflect_method(oop mirror, symbolHandle method_name, objArrayHandle types, jint which, TRAPS);
156 static objArrayOop reflect_methods(oop mirror, jint which, TRAPS);
157
158 // Reflective lookup of constructors. Returns java.lang.reflect.Constructor instances.
159 static oop reflect_constructor(oop mirror, objArrayHandle types, jint which, TRAPS);
160 static objArrayOop reflect_constructors(oop mirror, jint which, TRAPS);
161
162 // Method invokation through java.lang.reflect.Method
163 static oop invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS);
164 // Method invokation through java.lang.reflect.Constructor
165 static oop invoke_constructor(oop method_mirror, objArrayHandle args, TRAPS);
166 #endif /* SUPPORT_OLD_REFLECTION */
167
168 };