templateInterpreter.hpp

/*
 * Copyright 1997-2007 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,
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// This file contains the platform-independant parts
// of the template interpreter and the template interpreter generator.

#ifndef CC_INTERP

//------------------------------------------------------------------------------------------------------------------------
// A little wrapper class to group tosca-specific entry points into a unit.
// (tosca = Top-Of-Stack CAche)

class EntryPoint VALUE_OBJ_CLASS_SPEC {
 private:
  address _entry[number_of_states];

 public:
  // Construction
  EntryPoint();
  EntryPoint(address bentry, address centry, address sentry, address aentry, address ientry, address lentry, address fentry, address dentry, address ventry);

  // Attributes
  address entry(TosState state) const;                // return target address for a given tosca state
  void    set_entry(TosState state, address entry);   // set    target address for a given tosca state
  void    print();

  // Comparison
  bool operator == (const EntryPoint& y);             // for debugging only
};


//------------------------------------------------------------------------------------------------------------------------
// A little wrapper class to group tosca-specific dispatch tables into a unit.

class DispatchTable VALUE_OBJ_CLASS_SPEC {
 public:
  enum { length = 1 << BitsPerByte };                 // an entry point for each byte value (also for undefined bytecodes)

 private:
  address _table[number_of_states][length];           // dispatch tables, indexed by tosca and bytecode

 public:
  // Attributes
  EntryPoint entry(int i) const;                      // return entry point for a given bytecode i
  void       set_entry(int i, EntryPoint& entry);     // set    entry point for a given bytecode i
  address*   table_for(TosState state)          { return _table[state]; }
  address*   table_for()                        { return table_for((TosState)0); }
  int        distance_from(address *table)      { return table - table_for(); }
  int        distance_from(TosState state)      { return distance_from(table_for(state)); }

  // Comparison
  bool operator == (DispatchTable& y);                // for debugging only
};

class TemplateInterpreter: public AbstractInterpreter {
  friend class VMStructs;
  friend class InterpreterMacroAssembler;
  friend class TemplateInterpreterGenerator;
  friend class TemplateTable;
  // friend class Interpreter;
 public:

  enum MoreConstants {
    number_of_return_entries  = 9,                              // number of return entry points
    number_of_deopt_entries   = 9,                              // number of deoptimization entry points
    number_of_return_addrs    = 9                              // number of return addresses
  };

 protected:

  static address    _throw_ArrayIndexOutOfBoundsException_entry;
  static address    _throw_ArrayStoreException_entry;
  static address    _throw_ArithmeticException_entry;
  static address    _throw_ClassCastException_entry;
  static address    _throw_NullPointerException_entry;
  static address    _throw_exception_entry;

  static address    _throw_StackOverflowError_entry;

  static address    _remove_activation_entry;                   // continuation address if an exception is not handled by current frame
#ifdef HOTSWAP
  static address    _remove_activation_preserving_args_entry;   // continuation address when current frame is being popped
#endif // HOTSWAP

#ifndef PRODUCT
  static EntryPoint _trace_code;
#endif // !PRODUCT
  static EntryPoint _return_entry[number_of_return_entries];    // entry points to return to from a call
  static EntryPoint _earlyret_entry;                            // entry point to return early from a call
  static EntryPoint _deopt_entry[number_of_deopt_entries];      // entry points to return to from a deoptimization
  static EntryPoint _continuation_entry;
  static EntryPoint _safept_entry;

  static address    _return_3_addrs_by_index[number_of_return_addrs];     // for invokevirtual   return entries
  static address    _return_5_addrs_by_index[number_of_return_addrs];     // for invokeinterface return entries

  static DispatchTable _active_table;                           // the active    dispatch table (used by the interpreter for dispatch)
  static DispatchTable _normal_table;                           // the normal    dispatch table (used to set the active table in normal mode)
  static DispatchTable _safept_table;                           // the safepoint dispatch table (used to set the active table for safepoints)
  static address       _wentry_point[DispatchTable::length];    // wide instructions only (vtos tosca always)


 public:
  // Initialization/debugging
  static void       initialize();
  // this only returns whether a pc is within generated code for the interpreter.
  static bool       contains(address pc)                        { return _code != NULL && _code->contains(pc); }

 public:

  static address    remove_activation_early_entry(TosState state) { return _earlyret_entry.entry(state); }
#ifdef HOTSWAP
  static address    remove_activation_preserving_args_entry()   { return _remove_activation_preserving_args_entry; }
#endif // HOTSWAP

  static address    remove_activation_entry()                   { return _remove_activation_entry; }
  static address    throw_exception_entry()                     { return _throw_exception_entry; }
  static address    throw_ArithmeticException_entry()           { return _throw_ArithmeticException_entry; }
  static address    throw_NullPointerException_entry()          { return _throw_NullPointerException_entry; }
  static address    throw_StackOverflowError_entry()            { return _throw_StackOverflowError_entry; }

  // Code generation
#ifndef PRODUCT
  static address    trace_code    (TosState state)              { return _trace_code.entry(state); }
#endif // !PRODUCT
  static address    continuation  (TosState state)              { return _continuation_entry.entry(state); }
  static address*   dispatch_table(TosState state)              { return _active_table.table_for(state); }
  static address*   dispatch_table()                            { return _active_table.table_for(); }
  static int        distance_from_dispatch_table(TosState state){ return _active_table.distance_from(state); }
  static address*   normal_table(TosState state)                { return _normal_table.table_for(state); }
  static address*   normal_table()                              { return _normal_table.table_for(); }

  // Support for invokes
  static address*   return_3_addrs_by_index_table()             { return _return_3_addrs_by_index; }
  static address*   return_5_addrs_by_index_table()             { return _return_5_addrs_by_index; }
  static int        TosState_as_index(TosState state);          // computes index into return_3_entry_by_index table

  static address    return_entry  (TosState state, int length);
  static address    deopt_entry   (TosState state, int length);

  // Safepoint support
  static void       notice_safepoints();                        // stops the thread when reaching a safepoint
  static void       ignore_safepoints();                        // ignores safepoints

  // Deoptimization support
  static address    continuation_for(methodOop method,
                                     address bcp,
                                     int callee_parameters,
                                     bool is_top_frame,
                                     bool& use_next_mdp);

#include "incls/_templateInterpreter_pd.hpp.incl"

};

#endif // !CC_INTERP