1 /* 2 * Copyright (c) 1997, 2010, 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/methodOop.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 symbolHandle _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, symbolHandle name, int field_index, int field_offset, 56 BasicType field_type, AccessFlags access_flags); 57 KlassHandle klass() const { return _klass; } 58 symbolHandle 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 79 void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS); 80 void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method , TRAPS); 81 void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS); 82 void set_dynamic( methodHandle resolved_method, TRAPS); 83 void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS); 84 85 friend class LinkResolver; 86 87 public: 88 KlassHandle resolved_klass() const { return _resolved_klass; } 89 KlassHandle selected_klass() const { return _selected_klass; } 90 methodHandle resolved_method() const { return _resolved_method; } 91 methodHandle selected_method() const { return _selected_method; } 92 93 BasicType result_type() const { return selected_method()->result_type(); } 94 bool has_vtable_index() const { return _vtable_index >= 0; } 95 bool is_statically_bound() const { return _vtable_index == methodOopDesc::nonvirtual_vtable_index; } 96 int vtable_index() const { 97 // Even for interface calls the vtable index could be non-negative. 98 // See CallInfo::set_interface. 99 assert(has_vtable_index() || is_statically_bound(), ""); 100 return _vtable_index; 101 } 102 }; 103 104 105 // The LinkResolver is used to resolve constant-pool references at run-time. 106 // It does all necessary link-time checks & throws exceptions if necessary. 107 108 class LinkResolver: AllStatic { 109 private: 110 static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); 111 static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); 112 static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); 113 static void lookup_implicit_method (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, 114 KlassHandle current_klass, TRAPS); 115 116 static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); 117 118 static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); 119 static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry 120 121 static void resolve_pool (KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS); 122 123 static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS); 124 static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS); 125 126 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); 127 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); 128 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); 129 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); 130 131 static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS); 132 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); 133 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); 134 135 static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS); 136 static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS); 137 138 public: 139 // constant pool resolving 140 static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS); 141 142 // static resolving for all calls except interface calls 143 static void resolve_method (methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS); 144 static void resolve_dynamic_method (methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS); 145 static void resolve_interface_method(methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS); 146 147 // runtime/static resolving for fields 148 static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS); 149 // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution. 150 static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS); 151 152 // runtime resolving: 153 // resolved_klass = specified class (i.e., static receiver class) 154 // current_klass = sending method holder (i.e., class containing the method containing the call being resolved) 155 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); 156 static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS); 157 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); 158 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); 159 160 // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error 161 // also, does not initialize klass (i.e., no side effects) 162 static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); 163 static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); 164 static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); 165 static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); 166 167 // same as above for compile-time resolution; returns vtable_index if current_klass if linked 168 static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); 169 170 // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful) 171 static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access); 172 static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access); 173 174 // runtime resolving from constant pool 175 static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS); 176 static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS); 177 static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS); 178 static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS); 179 static void resolve_invokedynamic (CallInfo& result, constantPoolHandle pool, int index, TRAPS); 180 181 static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS); 182 }; 183 184 #endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP