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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsMemory_h__
#define nsMemory_h__
#include "nsIMemory.h"
#define NS_MEMORY_CONTRACTID "@mozilla.org/xpcom/memory-service;1"
#define NS_MEMORY_CLASSNAME "Global Memory Service"
#define NS_MEMORY_CID \
{ /* 30a04e40-38e7-11d4-8cf5-0060b0fc14a3 */ \
0x30a04e40, \
0x38e7, \
0x11d4, \
{0x8c, 0xf5, 0x00, 0x60, 0xb0, 0xfc, 0x14, 0xa3} \
}
/**
* Static helper routines to manage memory. These routines allow easy access
* to xpcom's built-in (global) nsIMemory implementation, without needing
* to go through the service manager to get it. However this requires clients
* to link with the xpcom DLL.
*
* This class is not threadsafe and is intented for use only on the main
* thread.
*/
class nsMemory
{
public:
static NS_COM void* Alloc(size_t size);
static NS_COM void* Realloc(void* ptr, size_t size);
static NS_COM void Free(void* ptr);
static NS_COM nsresult HeapMinimize(PRBool aImmediate);
static NS_COM void* Clone(const void* ptr, size_t size);
static NS_COM nsIMemory* GetGlobalMemoryService(); // AddRefs
};
/**
* Macro to free all elements of an XPCOM array of a given size using
* freeFunc, then frees the array itself using nsMemory::Free().
*
* Note that this macro (and its wrappers) can be used to deallocate a
* partially- or completely-built array while unwinding an error
* condition inside the XPCOM routine that was going to return the
* array. For this to work on a partially-built array, your code
* needs to be building the array from index 0 upwards, and simply
* pass the number of elements that have already been built (and thus
* need to be freed) as |size|.
*
* Thanks to <alecf@netscape.com> for suggesting this form, which
* allows the macro to be used with NS_RELEASE / NS_RELEASE_IF in
* addition to nsMemory::Free.
*
* @param size Number of elements in the array. If not a constant, this
* should be a PRInt32. Note that this means this macro
* will not work if size >= 2^31.
* @param array The array to be freed.
* @param freeFunc The function or macro to be used to free it.
* For arrays of nsISupports (or any class derived
* from it), NS_IF_RELEASE (or NS_RELEASE) should be
* passed as freeFunc. For most (all?) other pointer
* types (including XPCOM strings and wstrings),
* nsMemory::Free should be used, since the
* shared-allocator (nsMemory) is what will have been
* used to allocate the memory.
*/
#define NS_FREE_XPCOM_POINTER_ARRAY(size, array, freeFunc) \
PR_BEGIN_MACRO \
PRInt32 iter_ = PRInt32(size); \
while (--iter_ >= 0) \
freeFunc((array)[iter_]); \
nsMemory::Free((array)); \
PR_END_MACRO
// convenience macros for commonly used calls. mmmmm. syntactic sugar.
/**
* Macro to free arrays of non-refcounted objects allocated by the
* shared allocator (nsMemory) such as strings and wstrings. A
* convenience wrapper around NS_FREE_XPCOM_POINTER_ARRAY.
*
* @param size Number of elements in the array. If not a constant, this
* should be a PRInt32. Note that this means this macro
* will not work if size >= 2^31.
* @param array The array to be freed.
*/
#define NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(size, array) \
NS_FREE_XPCOM_POINTER_ARRAY((size), (array), nsMemory::Free)
/**
* Macro to free an array of pointers to nsISupports (or classes
* derived from it). A convenience wrapper around
* NS_FREE_XPCOM_POINTER_ARRAY.
*
* Note that if you know that none of your nsISupports pointers are
* going to be 0, you can gain a bit of speed by calling
* NS_FREE_XPCOM_POINTER_ARRAY directly and using NS_RELEASE as your
* free function.
*
* @param size Number of elements in the array. If not a constant, this
* should be a PRInt32. Note that this means this macro
* will not work if size >= 2^31.
* @param array The array to be freed.
*/
#define NS_FREE_XPCOM_ISUPPORTS_POINTER_ARRAY(size, array) \
NS_FREE_XPCOM_POINTER_ARRAY((size), (array), NS_IF_RELEASE)
/**
* Helpful array length function for calculating the length of a
* statically declared array.
*/
#define NS_ARRAY_LENGTH(array_) \
(sizeof(array_)/sizeof(array_[0]))
#endif // nsMemory_h__
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