/*

 * 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.

 *

 */

#include "code/stubs.hpp"

#include "interpreter/cppInterpreter.hpp"

#include "interpreter/templateInterpreter.hpp"

#include "memory/resourceArea.hpp"

#include "utilities/align.hpp"

// This file contains the platform-independent parts

// of the interpreter and the interpreter generator.

class InterpreterMacroAssembler;

//------------------------------------------------------------------------------------------------------------------------

// An InterpreterCodelet is a piece of interpreter code. All

// interpreter code is generated into little codelets which

// contain extra information for debugging and printing purposes.

class InterpreterCodelet: public Stub {

  friend class VMStructs;

  friend class CodeCacheDumper; // possible extension [do not remove]

 private:

  int         _size;                             // the size in bytes

  const char* _description;                      // a description of the codelet, for debugging & printing

  Bytecodes::Code _bytecode;                     // associated bytecode if any

  DEBUG_ONLY(CodeStrings _strings;)              // Comments for annotating assembler output.

 public:

  // Initialization/finalization

  void    initialize(int size,

                     CodeStrings& strings)       { _size = size;

                                                   DEBUG_ONLY(::new(&_strings) CodeStrings();)

                                                   DEBUG_ONLY(_strings.assign(strings);) }

  void    finalize()                             { ShouldNotCallThis(); }

  // General info/converters

  int     size() const                           { return _size; }

  static  int code_size_to_size(int code_size)   { return align_up((int)sizeof(InterpreterCodelet), CodeEntryAlignment) + code_size; }

  // Code info

  address code_begin() const                     { return (address)this + align_up(sizeof(InterpreterCodelet), CodeEntryAlignment); }

  address code_end() const                       { return (address)this + size(); }

  // Debugging

  void    verify();

  void    print_on(outputStream* st) const;

  void    print() const { print_on(tty); }

  // Interpreter-specific initialization

  void    initialize(const char* description, Bytecodes::Code bytecode);

  // Interpreter-specific attributes

  int         code_size() const                  { return code_end() - code_begin(); }

  const char* description() const                { return _description; }

  Bytecodes::Code bytecode() const               { return _bytecode; }

};

// Define a prototype interface

DEF_STUB_INTERFACE(InterpreterCodelet);

//------------------------------------------------------------------------------------------------------------------------

// A CodeletMark serves as an automatic creator/initializer for Codelets

// (As a subclass of ResourceMark it automatically GC's the allocated

// code buffer and assemblers).

class CodeletMark: ResourceMark {

 private:

  InterpreterCodelet*         _clet;

  InterpreterMacroAssembler** _masm;

  CodeBuffer                  _cb;

  int codelet_size() {

    // Request the whole code buffer (minus a little for alignment).

    // The commit call below trims it back for each codelet.

    int codelet_size = AbstractInterpreter::code()->available_space() - 2*K;

    // Guarantee there's a little bit of code space left.

    guarantee(codelet_size > 0 && (size_t)codelet_size > 2*K,

              "not enough space for interpreter generation");

    return codelet_size;

  }

 public:

  CodeletMark(InterpreterMacroAssembler*& masm,

              const char* description,

              Bytecodes::Code bytecode = Bytecodes::_illegal);

  ~CodeletMark();

};

// Wrapper typedef to use the name Interpreter to mean either

// the c++ interpreter or the template interpreter.

typedef CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) Interpreter;