1 /*

     2  * Copyright 1997-2005 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 

   107   static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);

   108 

   109   static void resolve_klass           (KlassHandle& result, constantPoolHandle  pool, int index, TRAPS);

   110   static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry

   111 

   112   static void resolve_pool  (KlassHandle& resolved_klass, symbolHandle& method_name, symbolHandle& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);

   113 

   114   static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);

   115   static void resolve_method          (methodHandle& resolved_method, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);

   116 

   117   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);

   118   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);

   119   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);

   120   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);

   121 

   122   static void runtime_resolve_special_method    (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS);

   123   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);

   124   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);

   125 

   126   static void check_field_accessability   (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS);

   127   static void check_method_accessability  (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS);

   128 

   129  public:

   130   // constant pool resolving

   131   static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS);

   132 

   133   // static resolving for all calls except interface calls

   134   static void resolve_method          (methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);

   135   static void resolve_interface_method(methodHandle& method_result, KlassHandle& klass_result, constantPoolHandle pool, int index, TRAPS);

   136 

   137   // runtime/static resolving for fields

   138   static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS);

   139   // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution.

   140   static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS);

   141 

   142   // runtime resolving:

   143   //   resolved_klass = specified class (i.e., static receiver class)

   144   //   current_klass  = sending method holder (i.e., class containing the method containing the call being resolved)

   145   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);

   146   static void resolve_special_call  (CallInfo& result,              KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access, TRAPS);

   147   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);

   148   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);

   149 

   150   // same as above for compile-time resolution; but returns null handle instead of throwing an exception on error

   151   // also, does not initialize klass (i.e., no side effects)

   152   static methodHandle resolve_virtual_call_or_null  (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);

   153   static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);

   154   static methodHandle resolve_static_call_or_null   (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);

   155   static methodHandle resolve_special_call_or_null  (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);

   156 

   157   // same as above for compile-time resolution; returns vtable_index if current_klass if linked

   158   static int resolve_virtual_vtable_index  (KlassHandle receiver_klass, KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass);

   159 

   160   // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful)

   161   static methodHandle linktime_resolve_virtual_method_or_null  (KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);

   162   static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, symbolHandle method_name, symbolHandle method_signature, KlassHandle current_klass, bool check_access);

   163 

   164   // runtime resolving from constant pool

   165   static void resolve_invokestatic   (CallInfo& result,              constantPoolHandle pool, int index, TRAPS);

   166   static void resolve_invokespecial  (CallInfo& result,              constantPoolHandle pool, int index, TRAPS);

   167   static void resolve_invokevirtual  (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);

   168   static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS);

   169 

   170   static void resolve_invoke         (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);

   171 };