nsVoidArray.cpp
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; c-file-offsets: ((substatement-open . 0)) -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdlib.h>
#include "nsVoidArray.h"
#include "nsQuickSort.h"
#include "prbit.h"
#include "nsISupportsImpl.h" // for nsTraceRefcnt
#include "nsAlgorithm.h"
/**
* Grow the array by at least this many elements at a time.
*/
static const int32_t kMinGrowArrayBy = 8;
static const int32_t kMaxGrowArrayBy = 1024;
static const int32_t kAutoClearCompactSizeFactor = 4;
/**
* This is the threshold (in bytes) of the mImpl struct, past which
* we'll force the array to grow geometrically
*/
static const int32_t kLinearThreshold = 24 * sizeof(void *);
/**
* Compute the number of bytes requires for the mImpl struct that will
* hold |n| elements.
*/
#define SIZEOF_IMPL(n_) (sizeof(Impl) + sizeof(void *) * ((n_) - 1))
/**
* Compute the number of elements that an mImpl struct of |n| bytes
* will hold.
*/
#define CAPACITYOF_IMPL(n_) ((((n_) - sizeof(Impl)) / sizeof(void *)) + 1)
#if DEBUG_VOIDARRAY
#define MAXVOID 10
class VoidStats {
public:
VoidStats();
~VoidStats();
};
static int sizesUsed; // number of the elements of the arrays used
static int sizesAlloced[MAXVOID]; // sizes of the allocations. sorted
static int NumberOfSize[MAXVOID]; // number of this allocation size (1 per array)
static int AllocedOfSize[MAXVOID]; // number of this allocation size (each size for array used)
static int MaxAuto[MAXVOID]; // AutoArrays that maxed out at this size
static int GrowInPlace[MAXVOID]; // arrays this size that grew in-place via realloc
// these are per-allocation
static int MaxElements[2000]; // # of arrays that maxed out at each size.
// statistics macros
#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 < MAXVOID) \
{ 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)
VoidStats::VoidStats()
{
sizesUsed = 1;
sizesAlloced[0] = 0;
}
VoidStats::~VoidStats()
{
int i;
for (i = 0; i < sizesUsed; i++)
{
printf("Size %d:\n",sizesAlloced[i]);
printf("\tNumber of VoidArrays this size (max): %d\n",NumberOfSize[i]-MaxAuto[i]);
printf("\tNumber of AutoVoidArrays this size (max): %d\n",MaxAuto[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 VoidArray:\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's get called
VoidStats gVoidStats;
#endif
void
nsVoidArray::SetArray(Impl *newImpl, int32_t aSize, int32_t aCount,
bool aOwner, bool aHasAuto)
{
// old mImpl has been realloced and so we don't free/delete it
NS_PRECONDITION(newImpl, "can't set size");
mImpl = newImpl;
mImpl->mCount = aCount;
mImpl->mBits = static_cast<uint32_t>(aSize & kArraySizeMask) |
(aOwner ? kArrayOwnerMask : 0) |
(aHasAuto ? kArrayHasAutoBufferMask : 0);
}
// This does all allocation/reallocation of the array.
// It also will compact down to N - good for things that might grow a lot
// at times, but usually are smaller, like JS deferred GC releases.
bool nsVoidArray::SizeTo(int32_t aSize)
{
uint32_t oldsize = GetArraySize();
bool isOwner = IsArrayOwner();
bool hasAuto = HasAutoBuffer();
if (aSize == (int32_t) oldsize)
return true; // no change
if (aSize <= 0)
{
// free the array if allocated
if (mImpl)
{
if (isOwner)
{
free(reinterpret_cast<char *>(mImpl));
if (hasAuto) {
static_cast<nsAutoVoidArray*>(this)->ResetToAutoBuffer();
}
else {
mImpl = nullptr;
}
}
else
{
mImpl->mCount = 0; // nsAutoVoidArray
}
}
return true;
}
if (mImpl && isOwner)
{
// We currently own an array impl. Resize it appropriately.
if (aSize < mImpl->mCount)
{
// XXX Note: we could also just resize to mCount
return true; // can't make it that small, ignore request
}
char* bytes = (char *) realloc(mImpl,SIZEOF_IMPL(aSize));
Impl* newImpl = reinterpret_cast<Impl*>(bytes);
if (!newImpl)
return false;
#if DEBUG_VOIDARRAY
if (mImpl == newImpl)
ADD_TO_STATS(GrowInPlace,oldsize);
ADD_TO_STATS(AllocedOfSize,SIZEOF_IMPL(aSize));
if (aSize > mMaxSize)
{
ADD_TO_STATS(NumberOfSize,SIZEOF_IMPL(aSize));
if (oldsize)
SUB_FROM_STATS(NumberOfSize,oldsize);
mMaxSize = aSize;
if (mIsAuto)
{
ADD_TO_STATS(MaxAuto,SIZEOF_IMPL(aSize));
SUB_FROM_STATS(MaxAuto,oldsize);
}
}
#endif
SetArray(newImpl, aSize, newImpl->mCount, true, hasAuto);
return true;
}
if ((uint32_t) aSize < oldsize) {
// No point in allocating if it won't free the current Impl anyway.
return true;
}
// just allocate an array
// allocate the exact size requested
char* bytes = (char *) malloc(SIZEOF_IMPL(aSize));
Impl* newImpl = reinterpret_cast<Impl*>(bytes);
if (!newImpl)
return false;
#if DEBUG_VOIDARRAY
ADD_TO_STATS(AllocedOfSize,SIZEOF_IMPL(aSize));
if (aSize > mMaxSize)
{
ADD_TO_STATS(NumberOfSize,SIZEOF_IMPL(aSize));
if (oldsize && !mImpl)
SUB_FROM_STATS(NumberOfSize,oldsize);
mMaxSize = aSize;
}
#endif
if (mImpl)
{
#if DEBUG_VOIDARRAY
ADD_TO_STATS(MaxAuto,SIZEOF_IMPL(aSize));
SUB_FROM_STATS(MaxAuto,0);
SUB_FROM_STATS(NumberOfSize,0);
mIsAuto = true;
#endif
// We must be growing an nsAutoVoidArray - copy since we didn't
// realloc.
memcpy(newImpl->mArray, mImpl->mArray,
mImpl->mCount * sizeof(mImpl->mArray[0]));
}
SetArray(newImpl, aSize, mImpl ? mImpl->mCount : 0, true, hasAuto);
// no memset; handled later in ReplaceElementAt if needed
return true;
}
bool nsVoidArray::GrowArrayBy(int32_t aGrowBy)
{
// We have to grow the array. Grow by kMinGrowArrayBy 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 < kMinGrowArrayBy)
aGrowBy = kMinGrowArrayBy;
uint32_t newCapacity = GetArraySize() + aGrowBy; // Minimum increase
uint32_t newSize = SIZEOF_IMPL(newCapacity);
if (newSize >= (uint32_t) kLinearThreshold)
{
// newCount includes enough space for at least kMinGrowArrayBy new
// slots. Select the next power-of-two size in bytes above or
// equal to that.
// Also, limit the increase in size to about a VM page or two.
if (GetArraySize() >= kMaxGrowArrayBy)
{
newCapacity = GetArraySize() + NS_MAX(kMaxGrowArrayBy,aGrowBy);
newSize = SIZEOF_IMPL(newCapacity);
}
else
{
PR_CEILING_LOG2(newSize, newSize);
newCapacity = CAPACITYOF_IMPL(PR_BIT(newSize));
}
}
// frees old mImpl IF this succeeds
if (!SizeTo(newCapacity))
return false;
return true;
}
nsVoidArray::nsVoidArray()
: mImpl(nullptr)
{
MOZ_COUNT_CTOR(nsVoidArray);
#if DEBUG_VOIDARRAY
mMaxCount = 0;
mMaxSize = 0;
mIsAuto = false;
ADD_TO_STATS(NumberOfSize,0);
MaxElements[0]++;
#endif
}
nsVoidArray::nsVoidArray(int32_t aCount)
: mImpl(nullptr)
{
MOZ_COUNT_CTOR(nsVoidArray);
#if DEBUG_VOIDARRAY
mMaxCount = 0;
mMaxSize = 0;
mIsAuto = false;
MaxElements[0]++;
#endif
SizeTo(aCount);
}
nsVoidArray& nsVoidArray::operator=(const nsVoidArray& other)
{
int32_t otherCount = other.Count();
int32_t maxCount = GetArraySize();
if (otherCount)
{
if (otherCount > maxCount)
{
// frees old mImpl IF this succeeds
if (!GrowArrayBy(otherCount-maxCount))
return *this; // XXX The allocation failed - don't do anything
memcpy(mImpl->mArray, other.mImpl->mArray, otherCount * sizeof(mImpl->mArray[0]));
mImpl->mCount = otherCount;
}
else
{
// the old array can hold the new array
memcpy(mImpl->mArray, other.mImpl->mArray, otherCount * sizeof(mImpl->mArray[0]));
mImpl->mCount = otherCount;
// if it shrank a lot, compact it anyways
if ((otherCount*2) < maxCount && maxCount > 100)
{
Compact(); // shrank by at least 50 entries
}
}
#if DEBUG_VOIDARRAY
if (mImpl->mCount > mMaxCount &&
mImpl->mCount < (int32_t)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mImpl->mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mImpl->mCount;
}
#endif
}
else
{
// Why do we drop the buffer here when we don't in Clear()?
SizeTo(0);
}
return *this;
}
nsVoidArray::~nsVoidArray()
{
MOZ_COUNT_DTOR(nsVoidArray);
if (mImpl && IsArrayOwner())
free(reinterpret_cast<char*>(mImpl));
}
bool nsVoidArray::SetCount(int32_t aNewCount)
{
NS_ASSERTION(aNewCount >= 0,"SetCount(negative index)");
if (aNewCount < 0)
return false;
if (aNewCount == 0)
{
Clear();
return true;
}
if (uint32_t(aNewCount) > uint32_t(GetArraySize()))
{
int32_t oldCount = Count();
int32_t growDelta = aNewCount - oldCount;
// frees old mImpl IF this succeeds
if (!GrowArrayBy(growDelta))
return false;
}
if (aNewCount > mImpl->mCount)
{
// Make sure that new entries added to the array by this
// SetCount are cleared to 0. Some users of this assume that.
// This code means we don't have to memset when we allocate an array.
memset(&mImpl->mArray[mImpl->mCount], 0,
(aNewCount - mImpl->mCount) * sizeof(mImpl->mArray[0]));
}
mImpl->mCount = aNewCount;
#if DEBUG_VOIDARRAY
if (mImpl->mCount > mMaxCount &&
mImpl->mCount < (int32_t)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mImpl->mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mImpl->mCount;
}
#endif
return true;
}
int32_t nsVoidArray::IndexOf(void* aPossibleElement) const
{
if (mImpl)
{
void** ap = mImpl->mArray;
void** end = ap + mImpl->mCount;
while (ap < end)
{
if (*ap == aPossibleElement)
{
return ap - mImpl->mArray;
}
ap++;
}
}
return -1;
}
bool nsVoidArray::InsertElementAt(void* aElement, int32_t aIndex)
{
int32_t oldCount = Count();
NS_ASSERTION(aIndex >= 0,"InsertElementAt(negative index)");
if (uint32_t(aIndex) > uint32_t(oldCount))
{
// An invalid index causes the insertion to fail
// Invalid indexes are ones that add more than one entry to the
// array (i.e., they can append).
return false;
}
if (oldCount >= GetArraySize())
{
if (!GrowArrayBy(1))
return false;
}
// else the array is already large enough
int32_t slide = oldCount - aIndex;
if (0 != slide)
{
// Slide data over to make room for the insertion
memmove(mImpl->mArray + aIndex + 1, mImpl->mArray + aIndex,
slide * sizeof(mImpl->mArray[0]));
}
mImpl->mArray[aIndex] = aElement;
mImpl->mCount++;
#if DEBUG_VOIDARRAY
if (mImpl->mCount > mMaxCount &&
mImpl->mCount < (int32_t)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mImpl->mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mImpl->mCount;
}
#endif
return true;
}
bool nsVoidArray::InsertElementsAt(const nsVoidArray& other, int32_t aIndex)
{
int32_t oldCount = Count();
int32_t otherCount = other.Count();
NS_ASSERTION(aIndex >= 0,"InsertElementsAt(negative index)");
if (uint32_t(aIndex) > uint32_t(oldCount))
{
// An invalid index causes the insertion to fail
// Invalid indexes are ones that are more than one entry past the end of
// the array (i.e., they can append).
return false;
}
if (oldCount + otherCount > GetArraySize())
{
if (!GrowArrayBy(otherCount))
return false;;
}
// else the array is already large enough
int32_t slide = oldCount - aIndex;
if (0 != slide)
{
// Slide data over to make room for the insertion
memmove(mImpl->mArray + aIndex + otherCount, mImpl->mArray + aIndex,
slide * sizeof(mImpl->mArray[0]));
}
for (int32_t i = 0; i < otherCount; i++)
{
// copy all the elements (destroys aIndex)
mImpl->mArray[aIndex++] = other.mImpl->mArray[i];
mImpl->mCount++;
}
#if DEBUG_VOIDARRAY
if (mImpl->mCount > mMaxCount &&
mImpl->mCount < (int32_t)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mImpl->mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mImpl->mCount;
}
#endif
return true;
}
bool nsVoidArray::ReplaceElementAt(void* aElement, int32_t aIndex)
{
NS_ASSERTION(aIndex >= 0,"ReplaceElementAt(negative index)");
if (aIndex < 0)
return false;
// Unlike InsertElementAt, ReplaceElementAt can implicitly add more
// than just the one element to the array.
if (uint32_t(aIndex) >= uint32_t(GetArraySize()))
{
int32_t oldCount = Count();
int32_t requestedCount = aIndex + 1;
int32_t growDelta = requestedCount - oldCount;
// frees old mImpl IF this succeeds
if (!GrowArrayBy(growDelta))
return false;
}
mImpl->mArray[aIndex] = aElement;
if (aIndex >= mImpl->mCount)
{
// Make sure that any entries implicitly added to the array by this
// ReplaceElementAt are cleared to 0. Some users of this assume that.
// This code means we don't have to memset when we allocate an array.
if (aIndex > mImpl->mCount) // note: not >=
{
// For example, if mCount is 2, and we do a ReplaceElementAt for
// element[5], then we need to set three entries ([2], [3], and [4])
// to 0.
memset(&mImpl->mArray[mImpl->mCount], 0,
(aIndex - mImpl->mCount) * sizeof(mImpl->mArray[0]));
}
mImpl->mCount = aIndex + 1;
#if DEBUG_VOIDARRAY
if (mImpl->mCount > mMaxCount &&
mImpl->mCount < (int32_t)(sizeof(MaxElements)/sizeof(MaxElements[0])))
{
MaxElements[mImpl->mCount]++;
MaxElements[mMaxCount]--;
mMaxCount = mImpl->mCount;
}
#endif
}
return true;
}
// useful for doing LRU arrays
bool nsVoidArray::MoveElement(int32_t aFrom, int32_t aTo)
{
void *tempElement;
if (aTo == aFrom)
return true;
NS_ASSERTION(aTo >= 0 && aFrom >= 0,"MoveElement(negative index)");
if (aTo >= Count() || aFrom >= Count())
{
// can't extend the array when moving an element. Also catches mImpl = null
return false;
}
tempElement = mImpl->mArray[aFrom];
if (aTo < aFrom)
{
// Moving one element closer to the head; the elements inbetween move down
memmove(mImpl->mArray + aTo + 1, mImpl->mArray + aTo,
(aFrom-aTo) * sizeof(mImpl->mArray[0]));
mImpl->mArray[aTo] = tempElement;
}
else // already handled aFrom == aTo
{
// Moving one element closer to the tail; the elements inbetween move up
memmove(mImpl->mArray + aFrom, mImpl->mArray + aFrom + 1,
(aTo-aFrom) * sizeof(mImpl->mArray[0]));
mImpl->mArray[aTo] = tempElement;
}
return true;
}
bool nsVoidArray::RemoveElementsAt(int32_t aIndex, int32_t aCount)
{
int32_t oldCount = Count();
NS_ASSERTION(aIndex >= 0,"RemoveElementsAt(negative index)");
if (uint32_t(aIndex) >= uint32_t(oldCount))
{
// An invalid index causes the replace to fail
return false;
}
// Limit to available entries starting at aIndex
if (aCount + aIndex > oldCount)
aCount = oldCount - aIndex;
// We don't need to move any elements if we're removing the
// last element in the array
if (aIndex < (oldCount - aCount))
{
memmove(mImpl->mArray + aIndex, mImpl->mArray + aIndex + aCount,
(oldCount - (aIndex + aCount)) * sizeof(mImpl->mArray[0]));
}
mImpl->mCount -= aCount;
return true;
}
bool nsVoidArray::RemoveElement(void* aElement)
{
int32_t theIndex = IndexOf(aElement);
if (theIndex != -1)
return RemoveElementAt(theIndex);
return false;
}
void nsVoidArray::Clear()
{
if (mImpl)
{
mImpl->mCount = 0;
// We don't have to free on Clear, but if we have a built-in buffer,
// it's worth considering.
if (HasAutoBuffer() && IsArrayOwner() &&
GetArraySize() > kAutoClearCompactSizeFactor * kAutoBufSize) {
SizeTo(0);
}
}
}
void nsVoidArray::Compact()
{
if (mImpl)
{
// XXX NOTE: this is quite inefficient in many cases if we're only
// compacting by a little, but some callers care more about memory use.
int32_t count = Count();
if (HasAutoBuffer() && count <= kAutoBufSize)
{
Impl* oldImpl = mImpl;
static_cast<nsAutoVoidArray*>(this)->ResetToAutoBuffer();
memcpy(mImpl->mArray, oldImpl->mArray,
count * sizeof(mImpl->mArray[0]));
free(reinterpret_cast<char *>(oldImpl));
}
else if (GetArraySize() > count)
{
SizeTo(Count());
}
}
}
// Needed because we want to pass the pointer to the item in the array
// to the comparator function, not a pointer to the pointer in the array.
struct VoidArrayComparatorContext {
nsVoidArrayComparatorFunc mComparatorFunc;
void* mData;
};
static int
VoidArrayComparator(const void* aElement1, const void* aElement2, void* aData)
{
VoidArrayComparatorContext* ctx = static_cast<VoidArrayComparatorContext*>(aData);
return (*ctx->mComparatorFunc)(*static_cast<void* const*>(aElement1),
*static_cast<void* const*>(aElement2),
ctx->mData);
}
void nsVoidArray::Sort(nsVoidArrayComparatorFunc aFunc, void* aData)
{
if (mImpl && mImpl->mCount > 1)
{
VoidArrayComparatorContext ctx = {aFunc, aData};
NS_QuickSort(mImpl->mArray, mImpl->mCount, sizeof(mImpl->mArray[0]),
VoidArrayComparator, &ctx);
}
}
bool nsVoidArray::EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData)
{
int32_t index = -1;
bool running = true;
if (mImpl) {
while (running && (++index < mImpl->mCount)) {
running = (*aFunc)(mImpl->mArray[index], aData);
}
}
return running;
}
bool nsVoidArray::EnumerateForwards(nsVoidArrayEnumFuncConst aFunc,
void* aData) const
{
int32_t index = -1;
bool running = true;
if (mImpl) {
while (running && (++index < mImpl->mCount)) {
running = (*aFunc)(mImpl->mArray[index], aData);
}
}
return running;
}
bool nsVoidArray::EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData)
{
bool running = true;
if (mImpl)
{
int32_t index = Count();
while (running && (0 <= --index))
{
running = (*aFunc)(mImpl->mArray[index], aData);
}
}
return running;
}
struct SizeOfElementIncludingThisData
{
size_t mSize;
nsVoidArraySizeOfElementIncludingThisFunc mSizeOfElementIncludingThis;
nsMallocSizeOfFun mMallocSizeOf;
void *mData; // the arg passed by the user
};
static bool
SizeOfElementIncludingThisEnumerator(const void *aElement, void *aData)
{
SizeOfElementIncludingThisData *d = (SizeOfElementIncludingThisData *)aData;
d->mSize += d->mSizeOfElementIncludingThis(aElement, d->mMallocSizeOf, d->mData);
return true;
}
size_t
nsVoidArray::SizeOfExcludingThis(
nsVoidArraySizeOfElementIncludingThisFunc aSizeOfElementIncludingThis,
nsMallocSizeOfFun aMallocSizeOf, void* aData) const
{
size_t n = 0;
// Measure the element storage.
if (mImpl) {
n += aMallocSizeOf(mImpl);
}
// Measure things pointed to by the elements.
if (aSizeOfElementIncludingThis) {
SizeOfElementIncludingThisData data2 =
{ 0, aSizeOfElementIncludingThis, aMallocSizeOf, aData };
EnumerateForwards(SizeOfElementIncludingThisEnumerator, &data2);
n += data2.mSize;
}
return n;
}
//----------------------------------------------------------------
// nsAutoVoidArray
nsAutoVoidArray::nsAutoVoidArray()
: nsVoidArray()
{
// Don't need to clear it. Some users just call ReplaceElementAt(),
// but we'll clear it at that time if needed to save CPU cycles.
#if DEBUG_VOIDARRAY
mIsAuto = true;
ADD_TO_STATS(MaxAuto,0);
#endif
ResetToAutoBuffer();
}
//----------------------------------------------------------------------
// NOTE: nsSmallVoidArray elements MUST all have the low bit as 0.
// This means that normally it's only used for pointers, and in particular
// structures or objects.
nsSmallVoidArray::~nsSmallVoidArray()
{
if (HasSingle())
{
// Have to null out mImpl before the nsVoidArray dtor runs.
mImpl = nullptr;
}
}
nsSmallVoidArray&
nsSmallVoidArray::operator=(nsSmallVoidArray& other)
{
int32_t count = other.Count();
switch (count) {
case 0:
Clear();
break;
case 1:
Clear();
AppendElement(other.ElementAt(0));
break;
default:
if (GetArraySize() >= count || SizeTo(count)) {
*AsArray() = *other.AsArray();
}
}
return *this;
}
int32_t
nsSmallVoidArray::GetArraySize() const
{
if (HasSingle()) {
return 1;
}
return AsArray()->GetArraySize();
}
int32_t
nsSmallVoidArray::Count() const
{
if (HasSingle()) {
return 1;
}
return AsArray()->Count();
}
void*
nsSmallVoidArray::FastElementAt(int32_t aIndex) const
{
NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsSmallVoidArray::FastElementAt: index out of range");
if (HasSingle()) {
return GetSingle();
}
return AsArray()->FastElementAt(aIndex);
}
int32_t
nsSmallVoidArray::IndexOf(void* aPossibleElement) const
{
if (HasSingle()) {
return aPossibleElement == GetSingle() ? 0 : -1;
}
return AsArray()->IndexOf(aPossibleElement);
}
bool
nsSmallVoidArray::InsertElementAt(void* aElement, int32_t aIndex)
{
NS_ASSERTION(!(NS_PTR_TO_INT32(aElement) & 0x1),
"Attempt to add element with 0x1 bit set to nsSmallVoidArray");
if (aIndex == 0 && IsEmpty()) {
SetSingle(aElement);
return true;
}
if (!EnsureArray()) {
return false;
}
return AsArray()->InsertElementAt(aElement, aIndex);
}
bool nsSmallVoidArray::InsertElementsAt(const nsVoidArray &aOther, int32_t aIndex)
{
#ifdef DEBUG
for (int i = 0; i < aOther.Count(); i++) {
NS_ASSERTION(!(NS_PTR_TO_INT32(aOther.ElementAt(i)) & 0x1),
"Attempt to add element with 0x1 bit set to nsSmallVoidArray");
}
#endif
if (aIndex == 0 && IsEmpty() && aOther.Count() == 1) {
SetSingle(aOther.FastElementAt(0));
return true;
}
if (!EnsureArray()) {
return false;
}
return AsArray()->InsertElementsAt(aOther, aIndex);
}
bool
nsSmallVoidArray::ReplaceElementAt(void* aElement, int32_t aIndex)
{
NS_ASSERTION(!(NS_PTR_TO_INT32(aElement) & 0x1),
"Attempt to add element with 0x1 bit set to nsSmallVoidArray");
if (aIndex == 0 && (IsEmpty() || HasSingle())) {
SetSingle(aElement);
return true;
}
if (!EnsureArray()) {
return false;
}
return AsArray()->ReplaceElementAt(aElement, aIndex);
}
bool
nsSmallVoidArray::AppendElement(void* aElement)
{
NS_ASSERTION(!(NS_PTR_TO_INT32(aElement) & 0x1),
"Attempt to add element with 0x1 bit set to nsSmallVoidArray");
if (IsEmpty()) {
SetSingle(aElement);
return true;
}
if (!EnsureArray()) {
return false;
}
return AsArray()->AppendElement(aElement);
}
bool
nsSmallVoidArray::RemoveElement(void* aElement)
{
if (HasSingle()) {
if (aElement == GetSingle()) {
mImpl = nullptr;
return true;
}
return false;
}
return AsArray()->RemoveElement(aElement);
}
bool
nsSmallVoidArray::RemoveElementAt(int32_t aIndex)
{
if (HasSingle()) {
if (aIndex == 0) {
mImpl = nullptr;
return true;
}
return false;
}
return AsArray()->RemoveElementAt(aIndex);
}
bool
nsSmallVoidArray::RemoveElementsAt(int32_t aIndex, int32_t aCount)
{
if (HasSingle()) {
if (aIndex == 0) {
if (aCount > 0) {
mImpl = nullptr;
}
return true;
}
return false;
}
return AsArray()->RemoveElementsAt(aIndex, aCount);
}
void
nsSmallVoidArray::Clear()
{
if (HasSingle()) {
mImpl = nullptr;
}
else {
AsArray()->Clear();
}
}
bool
nsSmallVoidArray::SizeTo(int32_t aMin)
{
if (!HasSingle()) {
return AsArray()->SizeTo(aMin);
}
if (aMin <= 0) {
mImpl = nullptr;
return true;
}
if (aMin == 1) {
return true;
}
void* single = GetSingle();
mImpl = nullptr;
if (!AsArray()->SizeTo(aMin)) {
SetSingle(single);
return false;
}
AsArray()->AppendElement(single);
return true;
}
void
nsSmallVoidArray::Compact()
{
if (!HasSingle()) {
AsArray()->Compact();
}
}
void
nsSmallVoidArray::Sort(nsVoidArrayComparatorFunc aFunc, void* aData)
{
if (!HasSingle()) {
AsArray()->Sort(aFunc,aData);
}
}
bool
nsSmallVoidArray::EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData)
{
if (HasSingle()) {
return (*aFunc)(GetSingle(), aData);
}
return AsArray()->EnumerateForwards(aFunc,aData);
}
bool
nsSmallVoidArray::EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData)
{
if (HasSingle()) {
return (*aFunc)(GetSingle(), aData);
}
return AsArray()->EnumerateBackwards(aFunc,aData);
}
bool
nsSmallVoidArray::EnsureArray()
{
if (!HasSingle()) {
return true;
}
void* single = GetSingle();
mImpl = nullptr;
if (!AsArray()->AppendElement(single)) {
SetSingle(single);
return false;
}
return true;
}
