1 /*
2 * Copyright 1997-2009 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 // All the necessary definitions for run-time link resolution.
26
27 // LinkInfo & its subclasses provide all the information gathered
28 // for a particular link after resolving it. A link is any reference
29 // made from within the bytecodes of a method to an object outside of
30 // that method. If the info is invalid, the link has not been resolved
31 // successfully.
32
33 class LinkInfo VALUE_OBJ_CLASS_SPEC {
34 };
35
36
37 // Link information for getfield/putfield & getstatic/putstatic bytecodes.
38
39 class FieldAccessInfo: public LinkInfo {
40 protected:
41 KlassHandle _klass;
42 symbolHandle _name;
43 AccessFlags _access_flags;
44 int _field_index; // original index in the klass
45 int _field_offset;
46 BasicType _field_type;
47
48 public:
49 void set(KlassHandle klass, symbolHandle name, int field_index, int field_offset,
50 BasicType field_type, AccessFlags access_flags);
51 KlassHandle klass() const { return _klass; }
52 symbolHandle name() const { return _name; }
53 int field_index() const { return _field_index; }
54 int field_offset() const { return _field_offset; }
55 BasicType field_type() const { return _field_type; }
56 AccessFlags access_flags() const { return _access_flags; }
57
58 // debugging
59 void print() PRODUCT_RETURN;
60 };
61
62
63 // Link information for all calls.
64
65 class CallInfo: public LinkInfo {
66 private:
67 KlassHandle _resolved_klass; // static receiver klass
68 KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass)
69 methodHandle _resolved_method; // static target method
70 methodHandle _selected_method; // dynamic (actual) target method
71 int _vtable_index; // vtable index of selected method
72
73 void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS);
74 void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method , TRAPS);
75 void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS);
76 void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS);
77
78 friend class LinkResolver;
79
80 public:
81 KlassHandle resolved_klass() const { return _resolved_klass; }
82 KlassHandle selected_klass() const { return _selected_klass; }
83 methodHandle resolved_method() const { return _resolved_method; }
84 methodHandle selected_method() const { return _selected_method; }
85
86 BasicType result_type() const { return selected_method()->result_type(); }
87 bool has_vtable_index() const { return _vtable_index >= 0; }
88 bool is_statically_bound() const { return _vtable_index == methodOopDesc::nonvirtual_vtable_index; }
89 int vtable_index() const {
90 // Even for interface calls the vtable index could be non-negative.
91 // See CallInfo::set_interface.
92 assert(has_vtable_index() || is_statically_bound(), "");
93 return _vtable_index;
94 }
95 };
96
97
98 // The LinkResolver is used to resolve constant-pool references at run-time.
99 // It does all necessary link-time checks & throws exceptions if necessary.
100
101 class LinkResolver: AllStatic {
102 private:
103 static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
104 static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
105 static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
106 static void lookup_implicit_method (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
107
108 static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
109
110 static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS);
111 static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry
112
113 static void resolve_pool (KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);
114
115 static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
116 static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
117
118 static void linktime_resolve_static_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
119 static void linktime_resolve_special_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
120 static void linktime_resolve_virtual_method (methodHandle &resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature,KlassHandle current_klass, bool check_access, TRAPS);
121 static void linktime_resolve_interface_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
122
123 static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
124 static void runtime_resolve_virtual_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS);
125 static void runtime_resolve_interface_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS);
126
127 static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
128 static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS);
129
130 public:
131 // constant pool resolving
132 static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS);
133
134 // static resolving for all calls except interface calls
135 static void resolve_method (methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);
136 static void resolve_interface_method(methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);
137
138 // runtime/static resolving for fields
139 static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS);
140 // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution.
141 static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS);
142
143 // runtime resolving:
144 // resolved_klass = specified class (i.e., static receiver class)
145 // current_klass = sending method holder (i.e., class containing the method containing the call being resolved)
146 static void resolve_static_call (CallInfo& result, KlassHandle& resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, bool initialize_klass, TRAPS);
147 static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
148 static void resolve_virtual_call (CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS);
149 static void resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS);
150
151 // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error
152 // also, does not initialize klass (i.e., no side effects)
153 static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
154 static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
155 static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
156 static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
157
158 // same as above for compile-time resolution; returns vtable_index if current_klass if linked
159 static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
160
161 // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful)
162 static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);
163 static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);
164
165 // runtime resolving from constant pool
166 static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
167 static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
168 static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
169 static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
170 static void resolve_invokedynamic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
171
172 static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
173 };