/*

 * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.

 * Copyright 2007, 2008 Red Hat, Inc.

 * 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.

 *

 */

class SignatureHandler {

 public:

  static SignatureHandler *from_handlerAddr(address handlerAddr) {

    return (SignatureHandler *) handlerAddr;

  }

 public:

  ffi_cif* cif() const {

    return (ffi_cif *) this;

  }

  int argument_count() const {

    return cif()->nargs;

  }

  ffi_type** argument_types() const {

    return (ffi_type**) (cif() + 1);

  }

  ffi_type* argument_type(int i) const {

    return argument_types()[i];

  }

  ffi_type* result_type() const {

    return *(argument_types() + argument_count());

  }

 protected:

  friend class InterpreterRuntime;

  friend class SignatureHandlerLibrary;

  void finalize();

};

class SignatureHandlerGeneratorBase : public NativeSignatureIterator {

 private:

  ffi_cif* _cif;

 protected:

  SignatureHandlerGeneratorBase(methodHandle method, ffi_cif *cif)

    : NativeSignatureIterator(method), _cif(cif) {

    _cif->nargs = 0;

  }

  ffi_cif *cif() const {

    return _cif;

  }

 public:

  void generate(uint64_t fingerprint);

 private:

  void pass_int();

  void pass_long();

  void pass_float();

  void pass_double();

  void pass_object();

 private:

  void push(BasicType type);

  virtual void push(intptr_t value) = 0;

};

class SignatureHandlerGenerator : public SignatureHandlerGeneratorBase {

 private:

  CodeBuffer* _cb;

 public:

  SignatureHandlerGenerator(methodHandle method, CodeBuffer* buffer)

    : SignatureHandlerGeneratorBase(method, (ffi_cif *) buffer->code_end()),

      _cb(buffer) {

    _cb->set_code_end((address) (cif() + 1));

  }

 private:

  void push(intptr_t value) {

    intptr_t *dst = (intptr_t *) _cb->code_end();

    _cb->set_code_end((address) (dst + 1));

    *dst = value;

  }

};

class SlowSignatureHandlerGenerator : public SignatureHandlerGeneratorBase {

 private:

  intptr_t *_dst;

 public:

  SlowSignatureHandlerGenerator(methodHandle method, intptr_t* buf)

    : SignatureHandlerGeneratorBase(method, (ffi_cif *) buf) {

    _dst = (intptr_t *) (cif() + 1);

  }

 private:

  void push(intptr_t value) {

    *(_dst++) = value;

  }

 public:

  SignatureHandler *handler() const {

    return (SignatureHandler *) cif();

  }

};