/*

  * Copyright (C) 2012 David Anderson

  *

  * This file is part of JITCraft.

  *

  * JITCraft is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free

  * Software Foundation, either version 3 of the License, or (at your option)

  * any later version.

  * 

  * Foobar 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 for more details.

  *

  * You should have received a copy of the GNU General Public License along with

  * JITCraft. If not, see http://www.gnu.org/licenses/.

  */

 #include <stdlib.h>

 #include "BytecodeEmitter.h"

 #include "Utility.h"

 #include "Types.h"

 using namespace jc;

 BytecodeEmitter::BytecodeEmitter()

   : buffer_(inline_buffer_),

     buffer_pos_(buffer_),

     buffer_end_(buffer_pos_ + ARRAY_LENGTH(inline_buffer_)),

     oom_(false),

     maxStackDepth_(0),

     stackDepth_(0)

 {

 }

 bool

 BytecodeEmitter::growBuffer(size_t nbytes)

 {

     if (oom_) {

         buffer_pos_ = buffer_;

         return false;

     }

     size_t newSize = size_t((buffer_end_ - buffer_) * 2);

     if (newSize >= MAX_LENGTH) {

         oom_ = true;

         buffer_pos_ = buffer_;

         return false;

     }

     bytecode *newBuffer;

     if (buffer_ == inline_buffer_)

         newBuffer = (bytecode *)malloc(nbytes);

     else

         newBuffer = (bytecode *)realloc(buffer_, newSize);

     // If we can't allocate a buffer, reset the buffer to the start and set

     // a flag to indicate out-of-memory.

     if (!newBuffer) {

         oom_ = true;

         buffer_pos_ = buffer_;

         return false;

     }

     buffer_pos_ = newBuffer + size_t(buffer_pos_ - buffer_);

     buffer_ = newBuffer;

     buffer_end_ = buffer_ + newSize;

     return true;

 }