136 lines
5.1 KiB
C++
136 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsMemory_h__
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#define nsMemory_h__
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#include "nsXPCOM.h"
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class nsIMemory;
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#define NS_MEMORY_CONTRACTID "@mozilla.org/xpcom/memory-service;1"
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#define NS_MEMORY_CID \
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{ /* 30a04e40-38e7-11d4-8cf5-0060b0fc14a3 */ \
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0x30a04e40, \
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0x38e7, \
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0x11d4, \
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{0x8c, 0xf5, 0x00, 0x60, 0xb0, 0xfc, 0x14, 0xa3} \
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}
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/**
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* Static helper routines to manage memory. These routines allow easy access
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* to xpcom's built-in (global) nsIMemory implementation, without needing
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* to go through the service manager to get it. However this requires clients
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* to link with the xpcom DLL.
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*
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* This class is not threadsafe and is intented for use only on the main
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* thread.
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*/
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class nsMemory
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{
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public:
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static nsresult HeapMinimize(bool aImmediate);
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static void* Clone(const void* aPtr, size_t aSize);
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static nsIMemory* GetGlobalMemoryService(); // AddRefs
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};
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/**
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* Macro to free all elements of an XPCOM array of a given size using
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* freeFunc, then frees the array itself using free().
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*
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* Note that this macro (and its wrappers) can be used to deallocate a
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* partially- or completely-built array while unwinding an error
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* condition inside the XPCOM routine that was going to return the
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* array. For this to work on a partially-built array, your code
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* needs to be building the array from index 0 upwards, and simply
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* pass the number of elements that have already been built (and thus
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* need to be freed) as |size|.
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*
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* Thanks to <alecf@netscape.com> for suggesting this form, which
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* allows the macro to be used with NS_RELEASE / NS_RELEASE_IF in
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* addition to free.
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*
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* @param size Number of elements in the array. If not a constant, this
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* should be a int32_t. Note that this means this macro
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* will not work if size >= 2^31.
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* @param array The array to be freed.
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* @param freeFunc The function or macro to be used to free it.
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* For arrays of nsISupports (or any class derived
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* from it), NS_IF_RELEASE (or NS_RELEASE) should be
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* passed as freeFunc. For most (all?) other pointer
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* types (including XPCOM strings and wstrings),
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* free should be used.
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*/
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#define NS_FREE_XPCOM_POINTER_ARRAY(size, array, freeFunc) \
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PR_BEGIN_MACRO \
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int32_t iter_ = int32_t(size); \
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while (--iter_ >= 0) \
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freeFunc((array)[iter_]); \
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NS_Free((array)); \
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PR_END_MACRO
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// convenience macros for commonly used calls. mmmmm. syntactic sugar.
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/**
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* Macro to free arrays of non-refcounted objects allocated by the
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* shared allocator (nsMemory) such as strings and wstrings. A
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* convenience wrapper around NS_FREE_XPCOM_POINTER_ARRAY.
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*
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* @param size Number of elements in the array. If not a constant, this
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* should be a int32_t. Note that this means this macro
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* will not work if size >= 2^31.
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* @param array The array to be freed.
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*/
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#define NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(size, array) \
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NS_FREE_XPCOM_POINTER_ARRAY((size), (array), NS_Free)
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/**
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* Macro to free an array of pointers to nsISupports (or classes
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* derived from it). A convenience wrapper around
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* NS_FREE_XPCOM_POINTER_ARRAY.
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*
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* Note that if you know that none of your nsISupports pointers are
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* going to be 0, you can gain a bit of speed by calling
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* NS_FREE_XPCOM_POINTER_ARRAY directly and using NS_RELEASE as your
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* free function.
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*
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* @param size Number of elements in the array. If not a constant, this
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* should be a int32_t. Note that this means this macro
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* will not work if size >= 2^31.
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* @param array The array to be freed.
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*/
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#define NS_FREE_XPCOM_ISUPPORTS_POINTER_ARRAY(size, array) \
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NS_FREE_XPCOM_POINTER_ARRAY((size), (array), NS_IF_RELEASE)
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/**
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* A macro, NS_ALIGNMENT_OF(t_) that determines the alignment
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* requirements of a type.
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*/
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namespace mozilla {
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template<class T>
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struct AlignmentTestStruct
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{
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char c;
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T t;
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};
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} // namespace mozilla
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#define NS_ALIGNMENT_OF(t_) \
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(sizeof(mozilla::AlignmentTestStruct<t_>) - sizeof(t_))
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/**
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* An enumeration type used to represent a method of assignment.
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*/
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enum nsAssignmentType
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{
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NS_ASSIGNMENT_COPY, // copy by value
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NS_ASSIGNMENT_DEPEND, // copy by reference
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NS_ASSIGNMENT_ADOPT // copy by reference (take ownership of resource)
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};
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#endif // nsMemory_h__
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