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 };