/* * Copyright (c) 1997, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_INTERPRETER_LINKRESOLVER_HPP #define SHARE_VM_INTERPRETER_LINKRESOLVER_HPP #include "oops/method.hpp" #include "utilities/top.hpp" // All the necessary definitions for run-time link resolution. // CallInfo provides all the information gathered for a particular // linked call site 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 CallInfo VALUE_OBJ_CLASS_SPEC { public: // Ways that a method call might be selected (or not) based on receiver type. // Note that an invokevirtual instruction might be linked with no_dispatch, // and an invokeinterface instruction might be linked with any of the three options enum CallKind { direct_call, // jump into resolved_method (must be concrete) vtable_call, // select recv.klass.method_at_vtable(index) itable_call, // select recv.klass.method_at_itable(resolved_method.holder, index) unknown_kind = -1 }; private: KlassHandle _resolved_klass; // static receiver klass, resolved from a symbolic reference KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass) methodHandle _resolved_method; // static target method methodHandle _selected_method; // dynamic (actual) target method CallKind _call_kind; // kind of call (static(=bytecode static/special + // others inferred), vtable, itable) int _call_index; // vtable or itable index of selected class method (if any) Handle _resolved_appendix; // extra argument in constant pool (if CPCE::has_appendix) Handle _resolved_method_type; // MethodType (for invokedynamic and invokehandle call sites) 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, int itable_index , TRAPS); void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS); void set_handle( methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS); void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, CallKind kind, int index, TRAPS); friend class LinkResolver; public: CallInfo() { #ifndef PRODUCT _call_kind = CallInfo::unknown_kind; _call_index = Method::garbage_vtable_index; #endif //PRODUCT } // utility to extract an effective CallInfo from a method and an optional receiver limit // does not queue the method for compilation CallInfo(Method* resolved_method, Klass* resolved_klass = NULL); 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; } Handle resolved_appendix() const { return _resolved_appendix; } Handle resolved_method_type() const { return _resolved_method_type; } BasicType result_type() const { return selected_method()->result_type(); } CallKind call_kind() const { return _call_kind; } int call_index() const { return _call_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(), ""); assert(call_kind() == vtable_call || call_kind() == direct_call, ""); // The returned value is < 0 if the call is statically bound. // But, the returned value may be >= 0 even if the kind is direct_call. // It is up to the caller to decide which way to go. return _call_index; } int itable_index() const { assert(call_kind() == itable_call, ""); // The returned value is always >= 0, a valid itable index. return _call_index; } // debugging #ifdef ASSERT bool has_vtable_index() const { return _call_index >= 0 && _call_kind != CallInfo::itable_call; } bool is_statically_bound() const { return _call_index == Method::nonvirtual_vtable_index; } #endif //ASSERT void verify() PRODUCT_RETURN; void print() PRODUCT_RETURN; }; // Link information for getfield/putfield & getstatic/putstatic bytecodes // is represented using a fieldDescriptor. // 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 { friend class klassVtable; friend class klassItable; private: static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, bool checkpolymorphism, bool in_imethod_resolve, TRAPS); static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); static void lookup_polymorphic_method (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, KlassHandle current_klass, Handle *appendix_result_or_null, Handle *method_type_result, TRAPS); static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); static void resolve_pool (KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS); static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool nostatics, TRAPS); static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool require_methodref, TRAPS); static void linktime_resolve_static_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); static void linktime_resolve_special_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); static void linktime_resolve_virtual_method (methodHandle &resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature,KlassHandle current_klass, bool check_access, TRAPS); static void linktime_resolve_interface_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* 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, Handle recv, 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 calls (will not run any Java code); used only from Bytecode_invoke::static_target static void resolve_method_statically(methodHandle& method_result, KlassHandle& klass_result, Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS); // runtime/static resolving for fields static void resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS); static void resolve_field(fieldDescriptor& result, KlassHandle resolved_klass, Symbol* field_name, Symbol* field_signature, KlassHandle current_klass, Bytecodes::Code access_kind, bool check_access, bool initialize_class, TRAPS); // source of access_kind codes: static Bytecodes::Code field_access_kind(bool is_static, bool is_put) { return (is_static ? (is_put ? Bytecodes::_putstatic : Bytecodes::_getstatic) : (is_put ? Bytecodes::_putfield : Bytecodes::_getfield )); } // 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, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool initialize_klass, TRAPS); static void resolve_special_call (CallInfo& result, Handle recv, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); static void resolve_virtual_call (CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* 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, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS); static void resolve_handle_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS); static void resolve_dynamic_call (CallInfo& result, Handle bootstrap_specifier, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, 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, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access = true); static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access = true); static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access = true); static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access = true); static int vtable_index_of_interface_method(KlassHandle klass, methodHandle resolved_method); // 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, Symbol* method_name, Symbol* 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, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access); static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, Symbol* method_name, Symbol* 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, Handle recv, 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_invokehandle (CallInfo& result, constantPoolHandle pool, int index, TRAPS); static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS); }; #endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP