/* * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // All the necessary definitions for run-time link resolution. // LinkInfo & its subclasses provide all the information gathered // for a particular link after resolving it. A link is any reference // made from within the bytecodes of a method to an object outside of // that method. If the info is invalid, the link has not been resolved // successfully. class LinkInfo VALUE_OBJ_CLASS_SPEC { }; // Link information for getfield/putfield & getstatic/putstatic bytecodes. class FieldAccessInfo: public LinkInfo { protected: KlassHandle _klass; symbolHandle _name; AccessFlags _access_flags; int _field_index; // original index in the klass int _field_offset; BasicType _field_type; public: void set(KlassHandle klass, symbolHandle name, int field_index, int field_offset, BasicType field_type, AccessFlags access_flags); KlassHandle klass() const { return _klass; } symbolHandle name() const { return _name; } int field_index() const { return _field_index; } int field_offset() const { return _field_offset; } BasicType field_type() const { return _field_type; } AccessFlags access_flags() const { return _access_flags; } // debugging void print() PRODUCT_RETURN; }; // Link information for all calls. class CallInfo: public LinkInfo { private: KlassHandle _resolved_klass; // static receiver klass KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass) methodHandle _resolved_method; // static target method methodHandle _selected_method; // dynamic (actual) target method int _vtable_index; // vtable index of selected method void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS); void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method , TRAPS); void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS); void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS); friend class LinkResolver; public: KlassHandle resolved_klass() const { return _resolved_klass; } KlassHandle selected_klass() const { return _selected_klass; } methodHandle resolved_method() const { return _resolved_method; } methodHandle selected_method() const { return _selected_method; } BasicType result_type() const { return selected_method()->result_type(); } bool has_vtable_index() const { return _vtable_index >= 0; } bool is_statically_bound() const { return _vtable_index == methodOopDesc::nonvirtual_vtable_index; } int vtable_index() const { // Even for interface calls the vtable index could be non-negative. // See CallInfo::set_interface. assert(has_vtable_index() || is_statically_bound(), ""); return _vtable_index; } }; // The LinkResolver is used to resolve constant-pool references at run-time. // It does all necessary link-time checks & throws exceptions if necessary. class LinkResolver: AllStatic { private: static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); static void lookup_implicit_method (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS); static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry static void resolve_pool (KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS); static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS); static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS); 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); 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); 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); 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); static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS); 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); 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); static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS); static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS); public: // constant pool resolving static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS); // static resolving for all calls except interface calls static void resolve_method (methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS); static void resolve_dynamic_method (methodHandle& resolved_method, KlassHandle& resolved_klass, constantPoolHandle pool, int index, TRAPS); static void resolve_interface_method(methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS); // runtime/static resolving for fields static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS); // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution. static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS); // runtime resolving: // resolved_klass = specified class (i.e., static receiver class) // current_klass = sending method holder (i.e., class containing the method containing the call being resolved) 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); static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS); 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); 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); // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error // also, does not initialize klass (i.e., no side effects) static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); // same as above for compile-time resolution; returns vtable_index if current_klass if linked static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass); // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful) static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access); static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access); // runtime resolving from constant pool static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS); static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS); static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS); static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS); static void resolve_invokedynamic (CallInfo& result, constantPoolHandle pool, int index, TRAPS); static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS); };