gecko-dev/xpcom/glue/nsVoidArray.h

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/* -*- 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
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*
* 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/
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*
* 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.
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*
* 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 ***** */
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#ifndef nsVoidArray_h___
#define nsVoidArray_h___
//#define DEBUG_VOIDARRAY 1
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#include "nscore.h"
#include "nsStringGlue.h"
#include "nsDebug.h"
// Comparator callback function for sorting array values.
typedef int (* nsVoidArrayComparatorFunc)
(const void* aElement1, const void* aElement2, void* aData);
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// Enumerator callback function. Return PR_FALSE to stop
typedef PRBool (* nsVoidArrayEnumFunc)(void* aElement, void *aData);
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/// A basic zero-based array of void*'s that manages its own memory
class NS_COM_GLUE nsVoidArray {
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public:
nsVoidArray();
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nsVoidArray(PRInt32 aCount); // initial count of aCount elements set to nsnull
~nsVoidArray();
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nsVoidArray& operator=(const nsVoidArray& other);
inline PRInt32 Count() const {
return mImpl ? mImpl->mCount : 0;
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}
// If the array grows, the newly created entries will all be null
PRBool SetCount(PRInt32 aNewCount);
// returns the max number that can be held without allocating
inline PRInt32 GetArraySize() const {
return mImpl ? (PRInt32(mImpl->mBits) & kArraySizeMask) : 0;
}
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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.
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void* ElementAt(PRInt32 aIndex) const
{
NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsVoidArray::ElementAt: index out of range");
return SafeElementAt(aIndex);
}
// bounds-checked version
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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];
}
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void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
PRInt32 IndexOf(void* aPossibleElement) const;
PRBool InsertElementAt(void* aElement, PRInt32 aIndex);
PRBool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
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PRBool ReplaceElementAt(void* aElement, PRInt32 aIndex);
// useful for doing LRU arrays, sorting, etc
PRBool MoveElement(PRInt32 aFrom, PRInt32 aTo);
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PRBool AppendElement(void* aElement) {
return InsertElementAt(aElement, Count());
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}
PRBool AppendElements(nsVoidArray& aElements) {
return InsertElementsAt(aElements, Count());
}
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PRBool RemoveElement(void* aElement);
PRBool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
PRBool RemoveElementAt(PRInt32 aIndex) { return RemoveElementsAt(aIndex,1); }
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void Clear();
PRBool SizeTo(PRInt32 aMin);
// Subtly different - Compact() tries to be smart about whether we
// should reallocate the array; SizeTo() always reallocates.
void Compact();
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void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
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PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
PRBool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
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protected:
PRBool 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;
PRBool 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, PRBool aOwner,
PRBool aHasAuto);
inline PRBool IsArrayOwner() const {
return mImpl && (mImpl->mBits & kArrayOwnerMask);
}
inline PRBool HasAutoBuffer() const {
return mImpl && (mImpl->mBits & kArrayHasAutoBufferMask);
}
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private:
/// Copy constructors are not allowed
nsVoidArray(const nsVoidArray& other);
};
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// 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, PR_FALSE,
PR_TRUE);
}
nsAutoVoidArray& operator=(const nsVoidArray& other)
{
nsVoidArray::operator=(other);
return *this;
}
protected:
// The internal storage
char mAutoBuf[sizeof(Impl) + (kAutoBufSize - 1) * sizeof(void*)];
};
class nsCString;
typedef int (* nsCStringArrayComparatorFunc)
(const nsCString* aElement1, const nsCString* aElement2, void* aData);
typedef PRBool (*nsCStringArrayEnumFunc)(nsCString& aElement, void *aData);
class NS_COM_GLUE nsCStringArray: private nsVoidArray
{
public:
nsCStringArray(void);
nsCStringArray(PRInt32 aCount); // Storage for aCount elements will be pre-allocated
~nsCStringArray(void);
nsCStringArray& operator=(const nsCStringArray& other);
PRInt32 Count(void) const {
return nsVoidArray::Count();
}
void CStringAt(PRInt32 aIndex, nsACString& aCString) const;
nsCString* CStringAt(PRInt32 aIndex) const;
nsCString* operator[](PRInt32 aIndex) const { return CStringAt(aIndex); }
PRInt32 IndexOf(const nsACString& aPossibleString) const;
#ifdef MOZILLA_INTERNAL_API
PRInt32 IndexOfIgnoreCase(const nsACString& aPossibleString) const;
#endif
PRBool InsertCStringAt(const nsACString& aCString, PRInt32 aIndex);
PRBool ReplaceCStringAt(const nsACString& aCString, PRInt32 aIndex);
PRBool AppendCString(const nsACString& aCString) {
return InsertCStringAt(aCString, Count());
}
PRBool RemoveCString(const nsACString& aCString);
#ifdef MOZILLA_INTERNAL_API
PRBool RemoveCStringIgnoreCase(const nsACString& aCString);
#endif
PRBool RemoveCStringAt(PRInt32 aIndex);
void Clear(void);
void Compact(void) {
nsVoidArray::Compact();
}
void Sort(void);
#ifdef MOZILLA_INTERNAL_API
void SortIgnoreCase(void);
#endif
void Sort(nsCStringArrayComparatorFunc aFunc, void* aData);
PRBool EnumerateForwards(nsCStringArrayEnumFunc aFunc, void* aData);
PRBool EnumerateBackwards(nsCStringArrayEnumFunc aFunc, void* aData);
private:
/// Copy constructors are not allowed
nsCStringArray(const nsCStringArray& other);
};
//===================================================================
// 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;
PRBool InsertElementAt(void* aElement, PRInt32 aIndex);
PRBool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
PRBool ReplaceElementAt(void* aElement, PRInt32 aIndex);
PRBool MoveElement(PRInt32 aFrom, PRInt32 aTo);
PRBool AppendElement(void* aElement);
PRBool AppendElements(nsVoidArray& aElements) {
return InsertElementsAt(aElements, Count());
}
PRBool RemoveElement(void* aElement);
PRBool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
PRBool RemoveElementAt(PRInt32 aIndex);
void Clear();
PRBool SizeTo(PRInt32 aMin);
void Compact();
void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
PRBool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
private:
PRBool 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);
}
PRBool 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;
}
PRBool EnsureArray();
};
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#endif /* nsVoidArray_h___ */