xpcom/glue/nsMemory.cpp

	nsMemory.cpp revision 677833bc953b6cb418c701facbdcf4aa18d6c44e
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * for the specific language governing rights and limitations under the
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 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
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 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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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() != nsnull))

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;
}

#ifdef XPCOM_GLUE
nsresult GlueStartupMemory()
{
    NS_ASSERTION(!gMemory, "bad call");
    NS_GetMemoryManager(&gMemory);
    NS_ASSERTION(gMemory, "can't get memory manager!");
    return NS_OK;
}

void GlueShutdownMemory()
{
    NS_IF_RELEASE(gMemory);
}
#endif

////////////////////////////////////////////////////////////////////////////////
// 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;
}

//----------------------------------------------------------------------