1 /*
2 * Copyright (c) 1997, 2013, 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 // CallInfo provides all the information gathered for a particular
34 // linked call site 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 CallInfo VALUE_OBJ_CLASS_SPEC {
40 public:
41 // Ways that a method call might be selected (or not) based on receiver type.
42 // Note that an invokevirtual instruction might be linked with no_dispatch,
43 // and an invokeinterface instruction might be linked with any of the three options
44 enum CallKind {
45 direct_call, // jump into resolved_method (must be concrete)
46 vtable_call, // select recv.klass.method_at_vtable(index)
47 itable_call, // select recv.klass.method_at_itable(resolved_method.holder, index)
48 unknown_kind = -1
49 };
50 private:
51 KlassHandle _resolved_klass; // static receiver klass, resolved from a symbolic reference
52 KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass)
53 methodHandle _resolved_method; // static target method
54 methodHandle _selected_method; // dynamic (actual) target method
55 CallKind _call_kind; // kind of call (static(=bytecode static/special +
56 // others inferred), vtable, itable)
57 int _call_index; // vtable or itable index of selected class method (if any)
58 Handle _resolved_appendix; // extra argument in constant pool (if CPCE::has_appendix)
59 Handle _resolved_method_type; // MethodType (for invokedynamic and invokehandle call sites)
60
61 void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS);
62 void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int itable_index , TRAPS);
63 void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS);
64 void set_handle( methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS);
65 void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, CallKind kind, int index, TRAPS);
66
67 friend class LinkResolver;
68
69 public:
70 CallInfo() {
71 #ifndef PRODUCT
72 _call_kind = CallInfo::unknown_kind;
73 _call_index = Method::garbage_vtable_index;
74 #endif //PRODUCT
75 }
76
77 // utility to extract an effective CallInfo from a method and an optional receiver limit
78 // does not queue the method for compilation
79 CallInfo(Method* resolved_method, Klass* resolved_klass = NULL);
80
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 Handle resolved_appendix() const { return _resolved_appendix; }
86 Handle resolved_method_type() const { return _resolved_method_type; }
87
88 BasicType result_type() const { return selected_method()->result_type(); }
89 CallKind call_kind() const { return _call_kind; }
90 int call_index() const { return _call_index; }
91 int vtable_index() const {
92 // Even for interface calls the vtable index could be non-negative.
93 // See CallInfo::set_interface.
94 assert(has_vtable_index() || is_statically_bound(), "");
95 assert(call_kind() == vtable_call || call_kind() == direct_call, "");
96 // The returned value is < 0 if the call is statically bound.
97 // But, the returned value may be >= 0 even if the kind is direct_call.
98 // It is up to the caller to decide which way to go.
99 return _call_index;
100 }
101 int itable_index() const {
102 assert(call_kind() == itable_call, "");
103 // The returned value is always >= 0, a valid itable index.
104 return _call_index;
105 }
106
107 // debugging
108 #ifdef ASSERT
109 bool has_vtable_index() const { return _call_index >= 0 && _call_kind != CallInfo::itable_call; }
110 bool is_statically_bound() const { return _call_index == Method::nonvirtual_vtable_index; }
111 #endif //ASSERT
112 void verify() PRODUCT_RETURN;
113 void print() PRODUCT_RETURN;
114 };
115
116 // Link information for getfield/putfield & getstatic/putstatic bytecodes
117 // is represented using a fieldDescriptor.
118
119 // The LinkResolver is used to resolve constant-pool references at run-time.
120 // It does all necessary link-time checks & throws exceptions if necessary.
121
122 class LinkResolver: AllStatic {
123 friend class klassVtable;
124 friend class klassItable;
125
126 private:
127 static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, bool checkpolymorphism, bool in_imethod_resolve, TRAPS);
128 static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
129 static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
130 static void lookup_polymorphic_method (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature,
131 KlassHandle current_klass, Handle *appendix_result_or_null, Handle *method_type_result, TRAPS);
132
133 static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS);
134
135 static void resolve_pool (KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);
136
137 static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool nostatics, TRAPS);
138 static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool require_methodref, TRAPS);
139
140 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);
141 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);
142 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);
143 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);
144
145 static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
146 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);
147 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);
148
149 static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
150 static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS);
151
152 public:
153 // constant pool resolving
154 static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS);
155
156 // static resolving calls (will not run any Java code); used only from Bytecode_invoke::static_target
157 static void resolve_method_statically(methodHandle& method_result, KlassHandle& klass_result,
158 Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS);
159
160 // runtime/static resolving for fields
161 static void resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
162 static void resolve_field(fieldDescriptor& result, KlassHandle resolved_klass, Symbol* field_name, Symbol* field_signature,
163 KlassHandle current_klass, Bytecodes::Code access_kind, bool check_access, bool initialize_class, TRAPS);
164
165 // source of access_kind codes:
166 static Bytecodes::Code field_access_kind(bool is_static, bool is_put) {
167 return (is_static
168 ? (is_put ? Bytecodes::_putstatic : Bytecodes::_getstatic)
169 : (is_put ? Bytecodes::_putfield : Bytecodes::_getfield ));
170 }
171
172 // runtime resolving:
173 // resolved_klass = specified class (i.e., static receiver class)
174 // current_klass = sending method holder (i.e., class containing the method containing the call being resolved)
175 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);
176 static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS);
177 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);
178 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);
179 static void resolve_handle_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS);
180 static void resolve_dynamic_call (CallInfo& result, Handle bootstrap_specifier, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS);
181
182 // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error
183 // also, does not initialize klass (i.e., no side effects)
184 static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
185 static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
186 static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
187 static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
188 static int vtable_index_of_interface_method(KlassHandle klass, methodHandle resolved_method);
189
190 // same as above for compile-time resolution; returns vtable_index if current_klass if linked
191 static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);
192
193 // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful)
194 static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access);
195 static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access);
196
197 // runtime resolving from constant pool
198 static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
199 static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
200 static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
201 static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
202 static void resolve_invokedynamic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
203 static void resolve_invokehandle (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
204
205 static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
206 };
207
208 #endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP