1 /*
2 * Copyright (c) 1997, 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
25 #ifndef SHARE_VM_INTERPRETER_LINKRESOLVER_HPP
26 #define SHARE_VM_INTERPRETER_LINKRESOLVER_HPP
27
28 #include "oops/method.hpp"
29 #include "utilities/top.hpp"
30
31 // All the necessary definitions for run-time link resolution.
32
33 // LinkInfo & its subclasses provide all the information gathered
34 // for a particular link after resolving it. A link is any reference
35 // made from within the bytecodes of a method to an object outside of
36 // that method. If the info is invalid, the link has not been resolved
37 // successfully.
38
39 class LinkInfo VALUE_OBJ_CLASS_SPEC {
40 };
41
42
43 // Link information for getfield/putfield & getstatic/putstatic bytecodes.
44
45 class FieldAccessInfo: public LinkInfo {
46 protected:
47 KlassHandle _klass;
48 Symbol* _name;
49 AccessFlags _access_flags;
50 int _field_index; // original index in the klass
51 int _field_offset;
52 BasicType _field_type;
53
54 public:
55 void set(KlassHandle klass, Symbol* name, int field_index, int field_offset,
56 BasicType field_type, AccessFlags access_flags);
57 KlassHandle klass() const { return _klass; }
58 Symbol* name() const { return _name; }
59 int field_index() const { return _field_index; }
60 int field_offset() const { return _field_offset; }
61 BasicType field_type() const { return _field_type; }
62 AccessFlags access_flags() const { return _access_flags; }
63
64 // debugging
65 void print() PRODUCT_RETURN;
66 };
67
68
69 // Link information for all calls.
70
71 class CallInfo: public LinkInfo {
72 private:
73 KlassHandle _resolved_klass; // static receiver klass
74 KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass)
75 methodHandle _resolved_method; // static target method
76 methodHandle _selected_method; // dynamic (actual) target method
77 int _vtable_index; // vtable index of selected method
78 Handle _resolved_appendix; // extra argument in constant pool (if CPCE::has_appendix)
79 Handle _resolved_method_type; // MethodType (for invokedynamic and invokehandle call sites)
80
81 void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS);
82 void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method , TRAPS);
83 void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS);
84 void set_handle( methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS);
85 void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS);
86
87 friend class LinkResolver;
88
89 public:
90 KlassHandle resolved_klass() const { return _resolved_klass; }
91 KlassHandle selected_klass() const { return _selected_klass; }
92 methodHandle resolved_method() const { return _resolved_method; }
93 methodHandle selected_method() const { return _selected_method; }
94 Handle resolved_appendix() const { return _resolved_appendix; }
95 Handle resolved_method_type() const { return _resolved_method_type; }
96
97 BasicType result_type() const { return selected_method()->result_type(); }
98 bool has_vtable_index() const { return _vtable_index >= 0; }
99 bool is_statically_bound() const { return _vtable_index == Method::nonvirtual_vtable_index; }
100 int vtable_index() const {
101 // Even for interface calls the vtable index could be non-negative.
102 // See CallInfo::set_interface.
103 assert(has_vtable_index() || is_statically_bound(), "");
104 return _vtable_index;
105 }
106 };
107
108
109 // The LinkResolver is used to resolve constant-pool references at run-time.
110 // It does all necessary link-time checks & throws exceptions if necessary.
111
112 class LinkResolver: AllStatic {
113 private:
114 static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
115 static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
116 static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
117 static void lookup_polymorphic_method (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature,
118 KlassHandle current_klass, Handle *appendix_result_or_null, Handle *method_type_result, TRAPS);
119
120 static int vtable_index_of_miranda_method(KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
121
122 static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS);
123 static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry
124
125 static void resolve_pool (KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);
126
127 static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
128 static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
129
130 static void linktime_resolve_static_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
131 static void linktime_resolve_special_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
132 static void linktime_resolve_virtual_method (methodHandle &resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature,KlassHandle current_klass, bool check_access, TRAPS);
133 static void linktime_resolve_interface_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
134
135 static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
136 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);
137 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);
138
139 static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
140 static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS);
141
142 public:
143 // constant pool resolving
144 static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS);
145
146 // static resolving calls (will not run any Java code); used only from Bytecode_invoke::static_target
147 static void resolve_method_statically(methodHandle& method_result, KlassHandle& klass_result,
148 Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS);
149
150 // runtime/static resolving for fields
151 static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS);
152 // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution.
153 static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS);
154
155 // runtime resolving:
156 // resolved_klass = specified class (i.e., static receiver class)
157 // current_klass = sending method holder (i.e., class containing the method containing the call being resolved)
158 static void resolve_static_call (CallInfo& result, KlassHandle& resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool initialize_klass, TRAPS);
159 static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
160 static void resolve_virtual_call (CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS);
161 static void resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS);
162 static void resolve_handle_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS);
163 static void resolve_dynamic_call (CallInfo& result, Handle bootstrap_specifier, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS);
164
165 // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error
166 // also, does not initialize klass (i.e., no side effects)
167 static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
168 static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
169 static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
170 static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
171
172 // same as above for compile-time resolution; returns vtable_index if current_klass if linked
173 static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
174
175 // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful)
176 static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access);
177 static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access);
178
179 // runtime resolving from constant pool
180 static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
181 static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
182 static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
183 static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
184 static void resolve_invokedynamic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
185 static void resolve_invokehandle (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
186
187 static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
188 };
189
190 #endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP