hotspot/src/share/vm/interpreter/abstractInterpreter.hpp
author duke
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/*
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 * Copyright 1997-2007 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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// This file contains the platform-independant parts
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// of the abstract interpreter and the abstract interpreter generator.
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// Organization of the interpreter(s). There exists two different interpreters in hotpot
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// an assembly language version (aka template interpreter) and a high level language version
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// (aka c++ interpreter). Th division of labor is as follows:
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// Template Interpreter          C++ Interpreter        Functionality
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//
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// templateTable*                bytecodeInterpreter*   actual interpretation of bytecodes
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//
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// templateInterpreter*          cppInterpreter*        generation of assembly code that creates
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//                                                      and manages interpreter runtime frames.
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//                                                      Also code for populating interpreter
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//                                                      frames created during deoptimization.
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//
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// For both template and c++ interpreter. There are common files for aspects of the interpreter
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// that are generic to both interpreters. This is the layout:
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//
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// abstractInterpreter.hpp: generic description of the interpreter.
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// interpreter*:            generic frame creation and handling.
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//
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//------------------------------------------------------------------------------------------------------------------------
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// The C++ interface to the bytecode interpreter(s).
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class AbstractInterpreter: AllStatic {
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  friend class VMStructs;
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  friend class Interpreter;
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  friend class CppInterpreterGenerator;
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 public:
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  enum MethodKind {
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    zerolocals,                                                 // method needs locals initialization
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    zerolocals_synchronized,                                    // method needs locals initialization & is synchronized
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    native,                                                     // native method
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    native_synchronized,                                        // native method & is synchronized
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    empty,                                                      // empty method (code: _return)
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    accessor,                                                   // accessor method (code: _aload_0, _getfield, _(a|i)return)
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    abstract,                                                   // abstract method (throws an AbstractMethodException)
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    java_lang_math_sin,                                         // implementation of java.lang.Math.sin   (x)
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    java_lang_math_cos,                                         // implementation of java.lang.Math.cos   (x)
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    java_lang_math_tan,                                         // implementation of java.lang.Math.tan   (x)
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    java_lang_math_abs,                                         // implementation of java.lang.Math.abs   (x)
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    java_lang_math_sqrt,                                        // implementation of java.lang.Math.sqrt  (x)
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    java_lang_math_log,                                         // implementation of java.lang.Math.log   (x)
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    java_lang_math_log10,                                       // implementation of java.lang.Math.log10 (x)
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    number_of_method_entries,
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    invalid = -1
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  };
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  enum SomeConstants {
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    number_of_result_handlers = 10                              // number of result handlers for native calls
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  };
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 protected:
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  static StubQueue* _code;                                      // the interpreter code (codelets)
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  static bool       _notice_safepoints;                         // true if safepoints are activated
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  static address    _native_entry_begin;                        // Region for native entry code
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  static address    _native_entry_end;
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  // method entry points
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  static address    _entry_table[number_of_method_entries];     // entry points for a given method
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  static address    _native_abi_to_tosca[number_of_result_handlers];  // for native method result handlers
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  static address    _slow_signature_handler;                              // the native method generic (slow) signature handler
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  static address    _rethrow_exception_entry;                   // rethrows an activation in previous frame
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  friend class      AbstractInterpreterGenerator;
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  friend class              InterpreterGenerator;
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  friend class      InterpreterMacroAssembler;
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 public:
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  // Initialization/debugging
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  static void       initialize();
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  static StubQueue* code()                                      { return _code; }
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  // Method activation
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  static MethodKind method_kind(methodHandle m);
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  static address    entry_for_kind(MethodKind k)                { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
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  static address    entry_for_method(methodHandle m)            { return _entry_table[method_kind(m)]; }
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  static void       print_method_kind(MethodKind kind)          PRODUCT_RETURN;
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  // Runtime support
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  // length = invoke bytecode length (to advance to next bytecode)
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  static address    deopt_entry   (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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  static address    return_entry  (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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  static address    rethrow_exception_entry()                   { return _rethrow_exception_entry; }
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  // Activation size in words for a method that is just being called.
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  // Parameters haven't been pushed so count them too.
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  static int        size_top_interpreter_activation(methodOop method);
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  // Deoptimization support
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  static address    continuation_for(methodOop method,
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                                     address bcp,
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                                     int callee_parameters,
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                                     bool is_top_frame,
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                                     bool& use_next_mdp);
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  // share implementation of size_activation and layout_activation:
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  static int        size_activation(methodOop method,
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                                    int temps,
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                                    int popframe_args,
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                                    int monitors,
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                                    int callee_params,
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                                    int callee_locals,
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                                    bool is_top_frame);
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  static int       layout_activation(methodOop method,
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                                      int temps,
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                                      int popframe_args,
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                                      int monitors,
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                                      int callee_params,
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                                      int callee_locals,
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                                      frame* caller,
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                                      frame* interpreter_frame,
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                                      bool is_top_frame);
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  // Runtime support
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  static bool       is_not_reached(                       methodHandle method, int bci);
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  // Safepoint support
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  static void       notice_safepoints()                         { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
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  static void       ignore_safepoints()                         { ShouldNotReachHere(); } // ignores safepoints
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  // Support for native calls
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  static address    slow_signature_handler()                    { return _slow_signature_handler; }
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  static address    result_handler(BasicType type)              { return _native_abi_to_tosca[BasicType_as_index(type)]; }
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  static int        BasicType_as_index(BasicType type);         // computes index into result_handler_by_index table
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  static bool       in_native_entry(address pc)                 { return _native_entry_begin <= pc && pc < _native_entry_end; }
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  // Debugging/printing
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  static void       print();                                    // prints the interpreter code
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  // Support for Tagged Stacks
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  //
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  // Tags are stored on the Java Expression stack above the value:
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  //
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  //  tag
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  //  value
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  //
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  // For double values:
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  //
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  //  tag2
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  //  high word
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  //  tag1
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  //  low word
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 public:
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  static int stackElementWords()   { return TaggedStackInterpreter ? 2 : 1; }
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  static int stackElementSize()    { return stackElementWords()*wordSize; }
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  static int logStackElementSize() { return
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                 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; }
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  // Tag is at pointer, value is one below for a stack growing down
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  // (or above for stack growing up)
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  static int  value_offset_in_bytes()  {
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    return TaggedStackInterpreter ?
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      frame::interpreter_frame_expression_stack_direction() * wordSize : 0;
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  }
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  static int  tag_offset_in_bytes()    {
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    assert(TaggedStackInterpreter, "should not call this");
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    return 0;
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  }
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  // Tagged Locals
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  // Locals are stored relative to Llocals:
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  //
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  // tag    <- Llocals[n]
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  // value
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  //
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  // Category 2 types are indexed as:
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  //
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  // tag    <- Llocals[-n]
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  // high word
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  // tag    <- Llocals[-n+1]
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  // low word
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  //
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  // Local values relative to locals[n]
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  static int  local_offset_in_bytes(int n) {
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    return ((frame::interpreter_frame_expression_stack_direction() * n) *
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            stackElementSize()) + value_offset_in_bytes();
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  }
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  static int  local_tag_offset_in_bytes(int n) {
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    assert(TaggedStackInterpreter, "should not call this");
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    return ((frame::interpreter_frame_expression_stack_direction() * n) *
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            stackElementSize()) + tag_offset_in_bytes();
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  }
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};
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//------------------------------------------------------------------------------------------------------------------------
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// The interpreter generator.
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class Template;
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class AbstractInterpreterGenerator: public StackObj {
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 protected:
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  InterpreterMacroAssembler* _masm;
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  // shared code sequences
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  // Converter for native abi result to tosca result
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  address generate_result_handler_for(BasicType type);
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  address generate_slow_signature_handler();
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  // entry point generator
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  address generate_method_entry(AbstractInterpreter::MethodKind kind);
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  void bang_stack_shadow_pages(bool native_call);
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  void generate_all();
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 public:
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  AbstractInterpreterGenerator(StubQueue* _code);
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};