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171
hotspot/src/share/vm/interpreter/linkResolver.hpp
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171
hotspot/src/share/vm/interpreter/linkResolver.hpp
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/*
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* Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// All the necessary definitions for run-time link resolution.
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// LinkInfo & its subclasses provide all the information gathered
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// for a particular link after resolving it. A link is any reference
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// made from within the bytecodes of a method to an object outside of
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// that method. If the info is invalid, the link has not been resolved
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// successfully.
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class LinkInfo VALUE_OBJ_CLASS_SPEC {
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};
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// Link information for getfield/putfield & getstatic/putstatic bytecodes.
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class FieldAccessInfo: public LinkInfo {
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protected:
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KlassHandle _klass;
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symbolHandle _name;
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AccessFlags _access_flags;
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int _field_index; // original index in the klass
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int _field_offset;
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BasicType _field_type;
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public:
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void set(KlassHandle klass, symbolHandle name, int field_index, int field_offset,
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BasicType field_type, AccessFlags access_flags);
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KlassHandle klass() const { return _klass; }
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symbolHandle name() const { return _name; }
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int field_index() const { return _field_index; }
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int field_offset() const { return _field_offset; }
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BasicType field_type() const { return _field_type; }
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AccessFlags access_flags() const { return _access_flags; }
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// debugging
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void print() PRODUCT_RETURN;
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};
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// Link information for all calls.
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class CallInfo: public LinkInfo {
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private:
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KlassHandle _resolved_klass; // static receiver klass
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KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass)
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methodHandle _resolved_method; // static target method
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methodHandle _selected_method; // dynamic (actual) target method
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int _vtable_index; // vtable index of selected method
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void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS);
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void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method , TRAPS);
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void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS);
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void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS);
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friend class LinkResolver;
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public:
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KlassHandle resolved_klass() const { return _resolved_klass; }
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KlassHandle selected_klass() const { return _selected_klass; }
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methodHandle resolved_method() const { return _resolved_method; }
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methodHandle selected_method() const { return _selected_method; }
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BasicType result_type() const { return selected_method()->result_type(); }
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bool has_vtable_index() const { return _vtable_index >= 0; }
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bool is_statically_bound() const { return _vtable_index == methodOopDesc::nonvirtual_vtable_index; }
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int vtable_index() const {
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// Even for interface calls the vtable index could be non-negative.
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// See CallInfo::set_interface.
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assert(has_vtable_index() || is_statically_bound(), "");
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return _vtable_index;
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}
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};
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// The LinkResolver is used to resolve constant-pool references at run-time.
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// It does all necessary link-time checks & throws exceptions if necessary.
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class LinkResolver: AllStatic {
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private:
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static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
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static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
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static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
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static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
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static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS);
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static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry
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static void resolve_pool (KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);
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static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
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static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
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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);
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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);
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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);
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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);
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static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);
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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);
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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);
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static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);
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static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS);
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public:
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// constant pool resolving
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static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS);
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// static resolving for all calls except interface calls
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static void resolve_method (methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);
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static void resolve_interface_method(methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);
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// runtime/static resolving for fields
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static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS);
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// takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution.
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static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS);
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// runtime resolving:
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// resolved_klass = specified class (i.e., static receiver class)
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// current_klass = sending method holder (i.e., class containing the method containing the call being resolved)
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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);
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static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);
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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);
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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);
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// same as above for compile-time resolution; but returns null handle instead of throwing an exception on error
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// also, does not initialize klass (i.e., no side effects)
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static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
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static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
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static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
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static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
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// same as above for compile-time resolution; returns vtable_index if current_klass if linked
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static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);
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// static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful)
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static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);
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static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);
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// runtime resolving from constant pool
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static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
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static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS);
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static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
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static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);
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static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
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};
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