gecko-dev/xpcom/glue/nsMemory.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
*
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* either 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"),
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#include "nsXPCOM.h"
#include "nsMemory.h"
#include "nsXPCOMPrivate.h"
static nsIMemory* gMemory = nsnull;
static NS_METHOD FreeGlobalMemory(void)
{
NS_IF_RELEASE(gMemory);
return NS_OK;
}
#define ENSURE_ALLOCATOR \
(gMemory ? PR_TRUE : (PRBool) SetupGlobalMemory())
static nsIMemory*
SetupGlobalMemory()
{
NS_ASSERTION(!gMemory, "bad call");
NS_GetMemoryManager(&gMemory);
NS_ASSERTION(gMemory, "can't get memory manager!");
NS_RegisterXPCOMExitRoutine(FreeGlobalMemory, 0);
return gMemory;
}
////////////////////////////////////////////////////////////////////////////////
// nsMemory static helper routines
NS_COM void*
nsMemory::Alloc(PRSize size)
{
if (!ENSURE_ALLOCATOR)
return nsnull;
return gMemory->Alloc(size);
}
NS_COM void*
nsMemory::Realloc(void* ptr, PRSize size)
{
if (!ENSURE_ALLOCATOR)
return nsnull;
return gMemory->Realloc(ptr, size);
}
NS_COM void
nsMemory::Free(void* ptr)
{
if (!ENSURE_ALLOCATOR)
return;
gMemory->Free(ptr);
}
NS_COM nsresult
nsMemory::HeapMinimize(PRBool aImmediate)
{
if (!ENSURE_ALLOCATOR)
return NS_ERROR_FAILURE;
return gMemory->HeapMinimize(aImmediate);
}
NS_COM void*
nsMemory::Clone(const void* ptr, PRSize size)
{
if (!ENSURE_ALLOCATOR)
return nsnull;
void* newPtr = gMemory->Alloc(size);
if (newPtr)
memcpy(newPtr, ptr, size);
return newPtr;
}
NS_COM nsIMemory*
nsMemory::GetGlobalMemoryService()
{
if (!ENSURE_ALLOCATOR)
return nsnull;
nsIMemory* result = gMemory;
NS_IF_ADDREF(result);
return result;
}
//----------------------------------------------------------------------