linkResolver.hpp revision 1472:c18cbe5936b8 
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// 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
33class LinkInfo VALUE_OBJ_CLASS_SPEC {
34};
35
36
37// Link information for getfield/putfield & getstatic/putstatic bytecodes.
38
39class 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
65class 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
101class 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,
107                                                 KlassHandle current_klass, TRAPS);
108
109  static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
110
111  static void resolve_klass           (KlassHandle& result, constantPoolHandle  pool, int index, TRAPS);
112  static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry
113
114  static void resolve_pool  (KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);
115
116  static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
117  static void resolve_method          (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
118
119  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);
120  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);
121  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);
122  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);
123
124  static void runtime_resolve_special_method    (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
125  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);
126  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);
127
128  static void check_field_accessability   (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
129  static void check_method_accessability  (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS);
130
131 public:
132  // constant pool resolving
133  static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS);
134
135  // static resolving for all calls except interface calls
136  static void resolve_method          (methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);
137  static void resolve_dynamic_method  (methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS);
138  static void resolve_interface_method(methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);
139
140  // runtime/static resolving for fields
141  static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS);
142  // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution.
143  static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS);
144
145  // runtime resolving:
146  //   resolved_klass = specified class (i.e., static receiver class)
147  //   current_klass  = sending method holder (i.e., class containing the method containing the call being resolved)
148  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);
149  static void resolve_special_call  (CallInfo& result,              KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
150  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);
151  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);
152
153  // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error
154  // also, does not initialize klass (i.e., no side effects)
155  static methodHandle resolve_virtual_call_or_null  (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
156  static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
157  static methodHandle resolve_static_call_or_null   (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
158  static methodHandle resolve_special_call_or_null  (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
159
160  // same as above for compile-time resolution; returns vtable_index if current_klass if linked
161  static int resolve_virtual_vtable_index  (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
162
163  // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful)
164  static methodHandle linktime_resolve_virtual_method_or_null  (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);
165  static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);
166
167  // runtime resolving from constant pool
168  static void resolve_invokestatic   (CallInfo& result,              constantPoolHandle pool, int index, TRAPS);
169  static void resolve_invokespecial  (CallInfo& result,              constantPoolHandle pool, int index, TRAPS);
170  static void resolve_invokevirtual  (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
171  static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
172  static void resolve_invokedynamic  (CallInfo& result,              constantPoolHandle pool, int index, TRAPS);
173
174  static void resolve_invoke         (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
175};
176