v8/src/zone-inl.h

// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_ZONE_INL_H_
#define V8_ZONE_INL_H_

#include "zone.h"
#include "v8-counters.h"

namespace v8 {
namespace internal {


inline void* Zone::New(int size) {
  ASSERT(AssertNoZoneAllocation::allow_allocation());
  ASSERT(ZoneScope::nesting() > 0);
  // Round up the requested size to fit the alignment.
  size = RoundUp(size, kAlignment);

  // Check if the requested size is available without expanding.
  Address result = position_;
  if ((position_ += size) > limit_) result = NewExpand(size);

  // Check that the result has the proper alignment and return it.
  ASSERT(IsAddressAligned(result, kAlignment, 0));
  return reinterpret_cast<void*>(result);
}


template <typename T>
T* Zone::NewArray(int length) {
  return static_cast<T*>(Zone::New(length * sizeof(T)));
}


bool Zone::excess_allocation() {
  return segment_bytes_allocated_ > zone_excess_limit_;
}


void Zone::adjust_segment_bytes_allocated(int delta) {
  segment_bytes_allocated_ += delta;
  Counters::zone_segment_bytes.Set(segment_bytes_allocated_);
}


template <typename Config>
ZoneSplayTree<Config>::~ZoneSplayTree() {
  // Reset the root to avoid unneeded iteration over all tree nodes
  // in the destructor.  For a zone-allocated tree, nodes will be
  // freed by the Zone.
  SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot();
}


} }  // namespace v8::internal

#endif  // V8_ZONE_INL_H_