mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
333 lines
11 KiB
C++
333 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; c-file-offsets: ((substatement-open . 0)) -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla 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/MPL/
|
|
*
|
|
* 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):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of 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 MPL, 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 MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
#ifndef nsVoidArray_h___
|
|
#define nsVoidArray_h___
|
|
|
|
//#define DEBUG_VOIDARRAY 1
|
|
|
|
#include "nsDebug.h"
|
|
|
|
// Comparator callback function for sorting array values.
|
|
typedef int (* nsVoidArrayComparatorFunc)
|
|
(const void* aElement1, const void* aElement2, void* aData);
|
|
|
|
// Enumerator callback function. Return false to stop
|
|
typedef bool (* nsVoidArrayEnumFunc)(void* aElement, void *aData);
|
|
typedef bool (* nsVoidArrayEnumFuncConst)(const void* aElement, void *aData);
|
|
|
|
// SizeOfExcludingThis callback function.
|
|
typedef size_t (* nsVoidArraySizeOfElementIncludingThisFunc)(const void* aElement,
|
|
nsMallocSizeOfFun aMallocSizeOf,
|
|
void *aData);
|
|
|
|
/// A basic zero-based array of void*'s that manages its own memory
|
|
class NS_COM_GLUE nsVoidArray {
|
|
public:
|
|
nsVoidArray();
|
|
nsVoidArray(PRInt32 aCount); // initial count of aCount elements set to nsnull
|
|
~nsVoidArray();
|
|
|
|
nsVoidArray& operator=(const nsVoidArray& other);
|
|
|
|
inline PRInt32 Count() const {
|
|
return mImpl ? mImpl->mCount : 0;
|
|
}
|
|
// If the array grows, the newly created entries will all be null
|
|
bool SetCount(PRInt32 aNewCount);
|
|
// returns the max number that can be held without allocating
|
|
inline PRInt32 GetArraySize() const {
|
|
return mImpl ? (PRInt32(mImpl->mBits) & kArraySizeMask) : 0;
|
|
}
|
|
|
|
void* FastElementAt(PRInt32 aIndex) const
|
|
{
|
|
NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsVoidArray::FastElementAt: index out of range");
|
|
return mImpl->mArray[aIndex];
|
|
}
|
|
|
|
// This both asserts and bounds-checks, because (1) we don't want
|
|
// people to write bad code, but (2) we don't want to change it to
|
|
// crashing for backwards compatibility. See bug 96108.
|
|
void* ElementAt(PRInt32 aIndex) const
|
|
{
|
|
NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsVoidArray::ElementAt: index out of range");
|
|
return SafeElementAt(aIndex);
|
|
}
|
|
|
|
// bounds-checked version
|
|
void* SafeElementAt(PRInt32 aIndex) const
|
|
{
|
|
if (PRUint32(aIndex) >= PRUint32(Count())) // handles aIndex < 0 too
|
|
{
|
|
return nsnull;
|
|
}
|
|
// The bounds check ensures mImpl is non-null.
|
|
return mImpl->mArray[aIndex];
|
|
}
|
|
|
|
void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
|
|
|
|
PRInt32 IndexOf(void* aPossibleElement) const;
|
|
|
|
bool InsertElementAt(void* aElement, PRInt32 aIndex);
|
|
bool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
|
|
|
|
bool ReplaceElementAt(void* aElement, PRInt32 aIndex);
|
|
|
|
// useful for doing LRU arrays, sorting, etc
|
|
bool MoveElement(PRInt32 aFrom, PRInt32 aTo);
|
|
|
|
bool AppendElement(void* aElement) {
|
|
return InsertElementAt(aElement, Count());
|
|
}
|
|
|
|
bool AppendElements(nsVoidArray& aElements) {
|
|
return InsertElementsAt(aElements, Count());
|
|
}
|
|
|
|
bool RemoveElement(void* aElement);
|
|
bool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
|
|
bool RemoveElementAt(PRInt32 aIndex) { return RemoveElementsAt(aIndex,1); }
|
|
|
|
void Clear();
|
|
|
|
bool SizeTo(PRInt32 aMin);
|
|
// Subtly different - Compact() tries to be smart about whether we
|
|
// should reallocate the array; SizeTo() always reallocates.
|
|
void Compact();
|
|
|
|
void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
|
|
|
|
bool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
|
|
bool EnumerateForwards(nsVoidArrayEnumFuncConst aFunc, void* aData) const;
|
|
bool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
|
|
|
|
// Measures the size of the array's element storage, and if
|
|
// |aSizeOfElementIncludingThis| is non-NULL, measures the size of things
|
|
// pointed to by elements.
|
|
size_t SizeOfExcludingThis(
|
|
nsVoidArraySizeOfElementIncludingThisFunc aSizeOfElementIncludingThis,
|
|
nsMallocSizeOfFun aMallocSizeOf, void* aData = NULL) const;
|
|
|
|
protected:
|
|
bool GrowArrayBy(PRInt32 aGrowBy);
|
|
|
|
struct Impl {
|
|
/**
|
|
* Packed bits. The low 30 bits are the array's size.
|
|
* The two highest bits indicate whether or not we "own" mImpl and
|
|
* must free() it when destroyed, and whether we have a preallocated
|
|
* nsAutoVoidArray buffer.
|
|
*/
|
|
PRUint32 mBits;
|
|
|
|
/**
|
|
* The number of elements in the array
|
|
*/
|
|
PRInt32 mCount;
|
|
|
|
/**
|
|
* Array data, padded out to the actual size of the array.
|
|
*/
|
|
void* mArray[1];
|
|
};
|
|
|
|
Impl* mImpl;
|
|
#if DEBUG_VOIDARRAY
|
|
PRInt32 mMaxCount;
|
|
PRInt32 mMaxSize;
|
|
bool mIsAuto;
|
|
#endif
|
|
|
|
enum {
|
|
kArrayOwnerMask = 1 << 31,
|
|
kArrayHasAutoBufferMask = 1 << 30,
|
|
kArraySizeMask = ~(kArrayOwnerMask | kArrayHasAutoBufferMask)
|
|
};
|
|
enum { kAutoBufSize = 8 };
|
|
|
|
|
|
// bit twiddlers
|
|
void SetArray(Impl *newImpl, PRInt32 aSize, PRInt32 aCount, bool aOwner,
|
|
bool aHasAuto);
|
|
inline bool IsArrayOwner() const {
|
|
return mImpl && (mImpl->mBits & kArrayOwnerMask);
|
|
}
|
|
inline bool HasAutoBuffer() const {
|
|
return mImpl && (mImpl->mBits & kArrayHasAutoBufferMask);
|
|
}
|
|
|
|
private:
|
|
/// Copy constructors are not allowed
|
|
nsVoidArray(const nsVoidArray& other);
|
|
};
|
|
|
|
|
|
// A zero-based array with a bit of automatic internal storage
|
|
class NS_COM_GLUE nsAutoVoidArray : public nsVoidArray {
|
|
public:
|
|
nsAutoVoidArray();
|
|
|
|
void ResetToAutoBuffer()
|
|
{
|
|
SetArray(reinterpret_cast<Impl*>(mAutoBuf), kAutoBufSize, 0, false,
|
|
true);
|
|
}
|
|
|
|
nsAutoVoidArray& operator=(const nsVoidArray& other)
|
|
{
|
|
nsVoidArray::operator=(other);
|
|
return *this;
|
|
}
|
|
|
|
protected:
|
|
// The internal storage
|
|
char mAutoBuf[sizeof(Impl) + (kAutoBufSize - 1) * sizeof(void*)];
|
|
};
|
|
|
|
|
|
//===================================================================
|
|
// nsSmallVoidArray is not a general-purpose replacement for
|
|
// ns(Auto)VoidArray because there is (some) extra CPU overhead for arrays
|
|
// larger than 1 element, though not a lot. It is appropriate for
|
|
// space-sensitive uses where sizes of 0 or 1 are moderately common or
|
|
// more, and where we're NOT storing arbitrary integers or arbitrary
|
|
// pointers.
|
|
|
|
// NOTE: nsSmallVoidArray can ONLY be used for holding items that always
|
|
// have the low bit as a 0 - i.e. element & 1 == 0. This happens to be
|
|
// true for allocated and object pointers for all the architectures we run
|
|
// on, but conceivably there might be some architectures/compilers for
|
|
// which it is NOT true. We know this works for all existing architectures
|
|
// because if it didn't then nsCheapVoidArray would have failed. Also note
|
|
// that we will ASSERT if this assumption is violated in DEBUG builds.
|
|
|
|
// XXX we're really re-implementing the whole nsVoidArray interface here -
|
|
// some form of abstract class would be useful
|
|
|
|
// I disagree on the abstraction here. If the point of this class is to be
|
|
// as small as possible, and no one will ever derive from it, as I found
|
|
// today, there should not be any virtualness to it to avoid the vtable
|
|
// ptr overhead.
|
|
|
|
class NS_COM_GLUE nsSmallVoidArray : private nsVoidArray
|
|
{
|
|
public:
|
|
~nsSmallVoidArray();
|
|
|
|
nsSmallVoidArray& operator=(nsSmallVoidArray& other);
|
|
void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
|
|
|
|
PRInt32 GetArraySize() const;
|
|
|
|
PRInt32 Count() const;
|
|
void* FastElementAt(PRInt32 aIndex) const;
|
|
// This both asserts and bounds-checks, because (1) we don't want
|
|
// people to write bad code, but (2) we don't want to change it to
|
|
// crashing for backwards compatibility. See bug 96108.
|
|
void* ElementAt(PRInt32 aIndex) const
|
|
{
|
|
NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsSmallVoidArray::ElementAt: index out of range");
|
|
return SafeElementAt(aIndex);
|
|
}
|
|
void* SafeElementAt(PRInt32 aIndex) const {
|
|
// let compiler inline; it may be able to remove these checks
|
|
if (PRUint32(aIndex) >= PRUint32(Count())) // handles aIndex < 0 too
|
|
{
|
|
return nsnull;
|
|
}
|
|
return FastElementAt(aIndex);
|
|
}
|
|
PRInt32 IndexOf(void* aPossibleElement) const;
|
|
bool InsertElementAt(void* aElement, PRInt32 aIndex);
|
|
bool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
|
|
bool ReplaceElementAt(void* aElement, PRInt32 aIndex);
|
|
bool MoveElement(PRInt32 aFrom, PRInt32 aTo);
|
|
bool AppendElement(void* aElement);
|
|
bool AppendElements(nsVoidArray& aElements) {
|
|
return InsertElementsAt(aElements, Count());
|
|
}
|
|
bool RemoveElement(void* aElement);
|
|
bool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
|
|
bool RemoveElementAt(PRInt32 aIndex);
|
|
|
|
void Clear();
|
|
bool SizeTo(PRInt32 aMin);
|
|
void Compact();
|
|
void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
|
|
|
|
bool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
|
|
bool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
|
|
|
|
private:
|
|
|
|
bool HasSingle() const
|
|
{
|
|
return !!(reinterpret_cast<PRWord>(mImpl) & 0x1);
|
|
}
|
|
void* GetSingle() const
|
|
{
|
|
NS_ASSERTION(HasSingle(), "wrong type");
|
|
return reinterpret_cast<void*>
|
|
(reinterpret_cast<PRWord>(mImpl) & ~0x1);
|
|
}
|
|
void SetSingle(void *aChild)
|
|
{
|
|
NS_ASSERTION(HasSingle() || !mImpl, "overwriting array");
|
|
mImpl = reinterpret_cast<Impl*>
|
|
(reinterpret_cast<PRWord>(aChild) | 0x1);
|
|
}
|
|
bool IsEmpty() const
|
|
{
|
|
// Note that this isn't the same as Count()==0
|
|
return !mImpl;
|
|
}
|
|
const nsVoidArray* AsArray() const
|
|
{
|
|
NS_ASSERTION(!HasSingle(), "This is a single");
|
|
return this;
|
|
}
|
|
nsVoidArray* AsArray()
|
|
{
|
|
NS_ASSERTION(!HasSingle(), "This is a single");
|
|
return this;
|
|
}
|
|
bool EnsureArray();
|
|
};
|
|
|
|
#endif /* nsVoidArray_h___ */
|