/*

 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.

 * Copyright 2009 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 SharkCodeBuffer : public StackObj {

 public:

  SharkCodeBuffer(MacroAssembler* masm)

    : _masm(masm), _base_pc(NULL) {}

 private:

  MacroAssembler* _masm;

  llvm::Value*    _base_pc;

 private:

  MacroAssembler* masm() const {

    return _masm;

  }

 public:

  llvm::Value* base_pc() const {

    return _base_pc;

  }

  void set_base_pc(llvm::Value* base_pc) {

    assert(_base_pc == NULL, "only do this once");

    _base_pc = base_pc;

  }

  // Allocate some space in the buffer and return its address.

  // This buffer will have been relocated by the time the method

  // is installed, so you can't inline the result in code.

 public:

  void* malloc(size_t size) const {

    masm()->align(BytesPerWord);

    void *result = masm()->pc();

    masm()->advance(size);

    return result;

  }

  // Create a unique offset in the buffer.

 public:

  int create_unique_offset() const {

    int offset = masm()->offset();

    masm()->advance(1);

    return offset;

  }

  // Inline an oop into the buffer and return its offset.

 public:

  int inline_oop(jobject object) const {

    masm()->align(BytesPerWord);

    int offset = masm()->offset();

    masm()->store_oop(object);

    return offset;

  }

  // Inline a block of non-oop data into the buffer and return its offset.

 public:

  int inline_data(void *src, size_t size) const {

    masm()->align(BytesPerWord);

    int offset = masm()->offset();

    void *dst = masm()->pc();

    masm()->advance(size);

    memcpy(dst, src, size);

    return offset;

  }

};