Quelle growableArray.cpp Sprache: C

/*
* Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
* 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.
*
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#include "precompiled.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/resourceArea.hpp"
#include "runtime/javaThread.hpp"
#include "utilities/growableArray.hpp"

void* GrowableArrayResourceAllocator::allocate(int max, int elementSize) {
  assert(max >= 0, "integer overflow");
  size_t byte_size = elementSize * (size_t) max;

  return (void*)resource_allocate_bytes(byte_size);
}

void* GrowableArrayArenaAllocator::allocate(int max, int element_size, Arena* arena) {
  assert(max >= 0, "integer overflow");
  size_t byte_size = element_size * (size_t) max;

  return arena->Amalloc(byte_size);
}

void* GrowableArrayCHeapAllocator::allocate(int max, int element_size, MEMFLAGS memflags) {
  assert(max >= 0, "integer overflow");
  size_t byte_size = element_size * (size_t) max;

  // memory type has to be specified for C heap allocation
  assert(memflags != mtNone, "memory type not specified for C heap object");
  return (void*)AllocateHeap(byte_size, memflags);
}

void GrowableArrayCHeapAllocator::deallocate(void* elements) {
  FreeHeap(elements);
}

#ifdef ASSERT

GrowableArrayNestingCheck::GrowableArrayNestingCheck(bool on_resource_area) :
    _nesting(on_resource_area ? Thread::current()->resource_area()->nesting() : 0) {
}

void GrowableArrayNestingCheck::on_resource_area_alloc() const {
  // Check for insidious allocation bug: if a GrowableArray overflows, the
  // grown array must be allocated under the same ResourceMark as the original.
  // Otherwise, the _data array will be deallocated too early.
  if (_nesting != Thread::current()->resource_area()->nesting()) {
    fatal("allocation bug: GrowableArray could grow within nested ResourceMark");
  }
}

void GrowableArrayMetadata::init_checks(const GrowableArrayBase* array) const {
  // Stack allocated arrays support all three element allocation locations
  if (array->allocated_on_stack_or_embedded()) {
    return;
  }

  // Otherwise there's a strict one-to-one mapping
  assert(on_C_heap() == array->allocated_on_C_heap(),
         "growable array must be C heap allocated if elements are");
  assert(on_resource_area() == array->allocated_on_res_area(),
         "growable array must be resource allocated if elements are");
  assert(on_arena() == array->allocated_on_arena(),
         "growable array must be arena allocated if elements are");
}

void GrowableArrayMetadata::on_resource_area_alloc_check() const {
  _nesting_check.on_resource_area_alloc();
}

#endif // ASSERT

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