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 /*

  * Copyright (c) 1997, 2013, 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

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 #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, 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 int vtable_index_of_miranda_method(KlassHandle klass, Symbol* name, Symbol* signature, 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, TRAPS);

   static void resolve_method          (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, 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, 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,              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);

   static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);

   static methodHandle resolve_static_call_or_null   (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass);

   static methodHandle resolve_special_call_or_null  (KlassHandle resolved_klass, Symbol* method_name, Symbol* 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, 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,              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