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pjs/xpcom/ds/nsSupportsArray.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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):
* Scott Collins <scc@mozilla.org>: |do_QueryElementAt|
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* 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"),
* 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <string.h>
#include "nsSupportsArray.h"
#include "nsSupportsArrayEnumerator.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include <string.h>
#if DEBUG_SUPPORTSARRAY
#define MAXSUPPORTS 20
class SupportsStats {
public:
SupportsStats();
~SupportsStats();
};
static int sizesUsed; // number of the elements of the arrays used
static int sizesAlloced[MAXSUPPORTS]; // sizes of the allocations. sorted
static int NumberOfSize[MAXSUPPORTS]; // number of this allocation size (1 per array)
static int AllocedOfSize[MAXSUPPORTS]; // number of this allocation size (each size for array used)
static int GrowInPlace[MAXSUPPORTS];
// these are per-allocation
static int MaxElements[3000];
// very evil
#define ADD_TO_STATS(x,size) do {int i; for (i = 0; i < sizesUsed; i++) \
{ \
if (sizesAlloced[i] == (int)(size)) \
{ ((x)[i])++; break; } \
} \
if (i >= sizesUsed && sizesUsed < MAXSUPPORTS) \
{ sizesAlloced[sizesUsed] = (size); \
((x)[sizesUsed++])++; break; \
} \
} while (0);
#define SUB_FROM_STATS(x,size) do {int i; for (i = 0; i < sizesUsed; i++) \
{ \
if (sizesAlloced[i] == (int)(size)) \
{ ((x)[i])--; break; } \
} \
} while (0);
SupportsStats::SupportsStats()
{
sizesUsed = 1;
sizesAlloced[0] = 0;
}
SupportsStats::~SupportsStats()
{
int i;
for (i = 0; i < sizesUsed; i++)
{
printf("Size %d:\n",sizesAlloced[i]);
printf("\tNumber of SupportsArrays this size (max): %d\n",NumberOfSize[i]);
printf("\tNumber of allocations this size (total): %d\n",AllocedOfSize[i]);
printf("\tNumber of GrowsInPlace this size (total): %d\n",GrowInPlace[i]);
}
printf("Max Size of SupportsArray:\n");
for (i = 0; i < (int)(sizeof(MaxElements)/sizeof(MaxElements[0])); i++)
{
if (MaxElements[i])
printf("\t%d: %d\n",i,MaxElements[i]);
}
}
// Just so constructor/destructor get called
SupportsStats gSupportsStats;
#endif
nsresult
nsQueryElementAt::operator()( const nsIID& aIID, void** aResult ) const
{
nsresult status = mCollection
? mCollection->QueryElementAt(mIndex, aIID, aResult)
: NS_ERROR_NULL_POINTER;
if ( mErrorPtr )
*mErrorPtr = status;
return status;
}
static const PRInt32 kGrowArrayBy = 8;
static const PRInt32 kLinearThreshold = 16 * sizeof(nsISupports *);
nsSupportsArray::nsSupportsArray()
{
NS_INIT_REFCNT();
mArray = mAutoArray;
mArraySize = kAutoArraySize;
mCount = 0;
#if DEBUG_SUPPORTSARRAY
mMaxCount = 0;
mMaxSize = 0;
ADD_TO_STATS(NumberOfSize,kAutoArraySize*sizeof(mArray[0]));
MaxElements[0]++;
#endif
}
nsSupportsArray::~nsSupportsArray()
{
DeleteArray();
}
PRBool nsSupportsArray::GrowArrayBy(PRInt32 aGrowBy)
{
// We have to grow the array. Grow by kGrowArrayBy slots if we're smaller
// than kLinearThreshold bytes, or a power of two if we're larger.
// This is much more efficient with most memory allocators, especially
// if it's very large, or of the allocator is binned.
if (aGrowBy < kGrowArrayBy)
aGrowBy = kGrowArrayBy;
PRUint32 newCount = mArraySize + aGrowBy; // Minimum increase
PRUint32 newSize = sizeof(mArray[0]) * newCount;
if (newSize >= (PRUint32) kLinearThreshold)
{
// newCount includes enough space for at least kGrowArrayBy new slots.
// Select the next power-of-two size in bytes above that.
// It's painful to find the biggest 1 bit. We check for a
// power-of-two here, and then double if it is one.
PRUint32 oldSize = sizeof(mArray[0]) * mArraySize;
if ((oldSize & (oldSize-1)) == 0) // oldSize = 2^n for some n
{
newSize = oldSize << 1; // easy 2^(n+1)
}
else // count bits and stuff.
{
PRUint32 bits = 0;
while (newSize >>= 1)
{
bits++;
}
bits++; // bump to the next power of two;
newSize = 1 << bits;
}
// Make sure we have enough space -- the array can grow by a lot
while (newSize/sizeof(mArray[0]) < newCount)
newSize <<= 1;
// inverse of equation above.
newCount = newSize/sizeof(mArray[0]);
}
// XXX This would be far more efficient in many allocators if we used
// XXX PR_Realloc(), etc
nsISupports** oldArray = mArray;
mArray = new nsISupports*[newCount];
if (!mArray) { // ran out of memory
mArray = oldArray;
return PR_FALSE;
}
mArraySize = newCount;
#if DEBUG_SUPPORTSARRAY
if (oldArray == mArray) // can't happen without use of realloc
ADD_TO_STATS(GrowInPlace,mCount);
ADD_TO_STATS(AllocedOfSize,mArraySize*sizeof(mArray[0]));
if (mArraySize > mMaxSize)
{
ADD_TO_STATS(NumberOfSize,mArraySize*sizeof(mArray[0]));
if (oldArray != &(mAutoArray[0]))
SUB_FROM_STATS(NumberOfSize,mCount*sizeof(mArray[0]));
mMaxSize = mArraySize;
}
#endif
if (oldArray) { // need to move old data
if (0 < mCount) {
::memcpy(mArray, oldArray, mCount * sizeof(nsISupports*));
}
if (oldArray != &(mAutoArray[0])) {
delete[] oldArray;
}
}
return PR_TRUE;
}
NS_METHOD
nsSupportsArray::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsCOMPtr<nsISupportsArray> it = new nsSupportsArray();
if (!it)
return NS_ERROR_OUT_OF_MEMORY;
return it->QueryInterface(aIID, aResult);
}
NS_IMPL_THREADSAFE_ISUPPORTS3(nsSupportsArray, nsISupportsArray, nsICollection, nsISerializable)
NS_IMETHODIMP
nsSupportsArray::Read(nsIObjectInputStream *aStream)
{
nsresult rv;
PRUint32 newArraySize;
rv = aStream->Read32(&newArraySize);
if (newArraySize <= kAutoArraySize) {
if (mArray != mAutoArray) {
delete[] mArray;
mArray = mAutoArray;
newArraySize = kAutoArraySize;
}
}
else {
if (newArraySize <= mArraySize) {
// Keep non-default-size mArray, it's more than big enough.
newArraySize = mArraySize;
}
else {
nsISupports** array = new nsISupports*[mArraySize];
if (!array)
return NS_ERROR_OUT_OF_MEMORY;
if (mArray != mAutoArray)
delete[] mArray;
mArray = array;
}
}
mArraySize = newArraySize;
rv = aStream->Read32(&mCount);
if (NS_FAILED(rv)) return rv;
for (PRUint32 i = 0; i < mCount; i++) {
rv = aStream->ReadObject(PR_TRUE, &mArray[i]);
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}
NS_IMETHODIMP
nsSupportsArray::Write(nsIObjectOutputStream *aStream)
{
nsresult rv;
rv = aStream->Write32(mArraySize);
if (NS_FAILED(rv)) return rv;
rv = aStream->Write32(mCount);
if (NS_FAILED(rv)) return rv;
for (PRUint32 i = 0; i < mCount; i++) {
rv = aStream->WriteObject(mArray[i], PR_TRUE);
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}
void nsSupportsArray::DeleteArray(void)
{
Clear();
if (mArray != &(mAutoArray[0])) {
delete[] mArray;
mArray = mAutoArray;
mArraySize = kAutoArraySize;
}
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::Equals(const nsISupportsArray* aOther)
{
if (aOther) {
PRUint32 countOther;
nsresult rv = NS_CONST_CAST(nsISupportsArray*, aOther)->Count( &countOther );
if (NS_FAILED( rv ))
return PR_FALSE;
if (mCount == countOther) {
PRUint32 aIndex = mCount;
nsCOMPtr<nsISupports> other;
while (0 < aIndex--) {
if (NS_FAILED( GetElementAt( aIndex, getter_AddRefs( other ) ) ))
return PR_FALSE;
if (mArray[aIndex] != other) {
return PR_FALSE;
}
}
return PR_TRUE;
}
}
return PR_FALSE;
}
NS_IMETHODIMP_(nsISupports*)
nsSupportsArray::ElementAt(PRUint32 aIndex)
{
if (aIndex < mCount) {
nsISupports* element = mArray[aIndex];
NS_IF_ADDREF(element);
return element;
}
return 0;
}
NS_IMETHODIMP_(PRInt32)
nsSupportsArray::IndexOf(const nsISupports* aPossibleElement)
{
return IndexOfStartingAt(aPossibleElement, 0);
}
NS_IMETHODIMP_(PRInt32)
nsSupportsArray::IndexOfStartingAt(const nsISupports* aPossibleElement,
PRUint32 aStartIndex)
{
if (aStartIndex < mCount) {
const nsISupports** start = (const nsISupports**)mArray; // work around goofy compiler behavior
const nsISupports** ep = (start + aStartIndex);
const nsISupports** end = (start + mCount);
while (ep < end) {
if (aPossibleElement == *ep) {
return (ep - start);
}
ep++;
}
}
return -1;
}
NS_IMETHODIMP_(PRInt32)
nsSupportsArray::LastIndexOf(const nsISupports* aPossibleElement)
{
if (0 < mCount) {
const nsISupports** start = (const nsISupports**)mArray; // work around goofy compiler behavior
const nsISupports** ep = (start + mCount);
while (start <= --ep) {
if (aPossibleElement == *ep) {
return (ep - start);
}
}
}
return -1;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::InsertElementAt(nsISupports* aElement, PRUint32 aIndex)
{
if (aIndex <= mCount) {
if (mArraySize < (mCount + 1)) {
// need to grow the array
if (!GrowArrayBy(1))
return PR_FALSE;
}
// Could be slightly more efficient if GrowArrayBy knew about the
// split, but the difference is trivial.
PRUint32 slide = (mCount - aIndex);
if (0 < slide) {
::memmove(mArray + aIndex + 1, mArray + aIndex, slide * sizeof(nsISupports*));
}
mArray[aIndex] = aElement;
NS_IF_ADDREF(aElement);
mCount++;
#if DEBUG_SUPPORTSARRAY
if (mCount > mMaxCount &&
mCount < (PRInt32)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mCount;
}
#endif
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::InsertElementsAt(nsISupportsArray* aElements, PRUint32 aIndex)
{
if (!aElements) {
return PR_FALSE;
}
PRUint32 countElements;
if (NS_FAILED( aElements->Count( &countElements ) ))
return PR_FALSE;
if (aIndex <= mCount) {
if (mArraySize < (mCount + countElements)) {
// need to grow the array
if (!GrowArrayBy(countElements))
return PR_FALSE;
}
// Could be slightly more efficient if GrowArrayBy knew about the
// split, but the difference is trivial.
PRUint32 slide = (mCount - aIndex);
if (0 < slide) {
::memmove(mArray + aIndex + countElements, mArray + aIndex,
slide * sizeof(nsISupports*));
}
for (PRUint32 i = 0; i < countElements; ++i, ++mCount) {
// use GetElementAt to copy and do AddRef for us
if (NS_FAILED( aElements->GetElementAt( i, mArray + aIndex + i) ))
return PR_FALSE;
}
#if DEBUG_SUPPORTSARRAY
if (mCount > mMaxCount &&
mCount < (PRInt32)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mCount;
}
#endif
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::ReplaceElementAt(nsISupports* aElement, PRUint32 aIndex)
{
if (aIndex < mCount) {
NS_IF_ADDREF(aElement); // addref first in case it's the same object!
NS_IF_RELEASE(mArray[aIndex]);
mArray[aIndex] = aElement;
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::RemoveElementsAt(PRUint32 aIndex, PRUint32 aCount)
{
if (aIndex < mCount) {
for (PRUint32 i = 0; i < aCount; i++)
{
NS_IF_RELEASE(mArray[aIndex+i]);
}
mCount -= aCount;
PRInt32 slide = (mCount - aIndex);
if (0 < slide) {
::memmove(mArray + aIndex, mArray + aIndex + aCount,
slide * sizeof(nsISupports*));
}
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::RemoveElement(const nsISupports* aElement, PRUint32 aStartIndex)
{
PRInt32 theIndex = IndexOfStartingAt(aElement,aStartIndex);
if (theIndex >= 0)
return RemoveElementAt(theIndex);
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::RemoveLastElement(const nsISupports* aElement)
{
PRInt32 theIndex = LastIndexOf(aElement);
if (theIndex >= 0)
return RemoveElementAt(theIndex);
return PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::MoveElement(PRInt32 aFrom, PRInt32 aTo)
{
nsISupports *tempElement;
if (aTo == aFrom)
return PR_TRUE;
if (aTo < 0 || aFrom < 0 ||
(PRUint32) aTo >= mCount || (PRUint32) aFrom >= mCount)
{
// can't extend the array when moving an element. Also catches mImpl = null
return PR_FALSE;
}
tempElement = mArray[aFrom];
if (aTo < aFrom)
{
// Moving one element closer to the head; the elements inbetween move down
::memmove(mArray + aTo + 1, mArray + aTo,
(aFrom-aTo) * sizeof(mArray[0]));
mArray[aTo] = tempElement;
}
else // already handled aFrom == aTo
{
// Moving one element closer to the tail; the elements inbetween move up
::memmove(mArray + aFrom, mArray + aFrom + 1,
(aTo-aFrom) * sizeof(mArray[0]));
mArray[aTo] = tempElement;
}
return PR_TRUE;
}
NS_IMETHODIMP
nsSupportsArray::Clear(void)
{
if (0 < mCount) {
do {
--mCount;
NS_IF_RELEASE(mArray[mCount]);
} while (0 != mCount);
}
return NS_OK;
}
NS_IMETHODIMP
nsSupportsArray::Compact(void)
{
#if DEBUG_SUPPORTSARRAY
PRUint32 oldArraySize = mArraySize;
#endif
if ((mArraySize != mCount) && (kAutoArraySize < mArraySize)) {
nsISupports** oldArray = mArray;
if (mCount <= kAutoArraySize) {
mArray = mAutoArray;
mArraySize = kAutoArraySize;
}
else {
mArray = new nsISupports*[mCount];
if (!mArray) {
mArray = oldArray;
return NS_OK;
}
mArraySize = mCount;
}
#if DEBUG_SUPPORTSARRAY
if (oldArray == mArray &&
oldArray != &(mAutoArray[0])) // can't happen without use of realloc
ADD_TO_STATS(GrowInPlace,oldArraySize);
if (oldArray != &(mAutoArray[0]))
ADD_TO_STATS(AllocedOfSize,mArraySize*sizeof(mArray[0]));
#endif
::memcpy(mArray, oldArray, mCount * sizeof(nsISupports*));
delete[] oldArray;
}
return NS_OK;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::SizeTo(PRInt32 aSize)
{
#if DEBUG_SUPPORTSARRAY
PRUint32 oldArraySize = mArraySize;
#endif
// XXX for aSize < mCount we could resize to mCount
if (mArraySize == aSize || aSize < mCount) // nothing to do
return PR_TRUE;
// switch back to autoarray if possible
nsISupports** oldArray = mArray;
if (kAutoArraySize <= aSize) {
mArray = mAutoArray;
mArraySize = kAutoArraySize;
}
else {
mArray = new nsISupports*[aSize];
if (!mArray) {
mArray = oldArray;
return PR_FALSE;
}
mArraySize = aSize;
}
#if DEBUG_SUPPORTSARRAY
if (oldArray == mArray &&
oldArray != &(mAutoArray[0])) // can't happen without use of realloc
ADD_TO_STATS(GrowInPlace,oldArraySize);
if (oldArray != &(mAutoArray[0]))
ADD_TO_STATS(AllocedOfSize,mArraySize*sizeof(mArray[0]));
#endif
::memcpy(mArray, oldArray, mCount * sizeof(nsISupports*));
if (oldArray != mAutoArray)
delete[] oldArray;
return PR_TRUE;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::EnumerateForwards(nsISupportsArrayEnumFunc aFunc, void* aData)
{
PRInt32 aIndex = -1;
PRBool running = PR_TRUE;
while (running && (++aIndex < (PRInt32)mCount)) {
running = (*aFunc)(mArray[aIndex], aData);
}
return running;
}
NS_IMETHODIMP_(PRBool)
nsSupportsArray::EnumerateBackwards(nsISupportsArrayEnumFunc aFunc, void* aData)
{
PRUint32 aIndex = mCount;
PRBool running = PR_TRUE;
while (running && (0 < aIndex--)) {
running = (*aFunc)(mArray[aIndex], aData);
}
return running;
}
NS_IMETHODIMP
nsSupportsArray::Enumerate(nsIEnumerator* *result)
{
nsSupportsArrayEnumerator* e = new nsSupportsArrayEnumerator(this);
if (!e)
return NS_ERROR_OUT_OF_MEMORY;
*result = e;
NS_ADDREF(e);
return NS_OK;
}
static PRBool
CopyElement(nsISupports* aElement, void *aData)
{
nsresult rv;
nsISupportsArray* newArray = (nsISupportsArray*)aData;
rv = newArray->AppendElement(aElement);
return NS_SUCCEEDED(rv);
}
NS_IMETHODIMP
nsSupportsArray::Clone(nsISupportsArray* *result)
{
nsresult rv;
nsISupportsArray* newArray;
rv = NS_NewISupportsArray(&newArray);
PRBool ok = EnumerateForwards(CopyElement, newArray);
if (!ok) return NS_ERROR_OUT_OF_MEMORY;
*result = newArray;
return NS_OK;
}
NS_COM nsresult
NS_NewISupportsArray(nsISupportsArray** aInstancePtrResult)
{
nsresult rv;
rv = nsSupportsArray::Create(NULL, NS_GET_IID(nsISupportsArray),
(void**)aInstancePtrResult);
return rv;
}
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