зеркало из https://github.com/mozilla/gecko-dev.git
bug #74726: sr=waterson, r=beard. Here's the new version of |nsXPIDLC?String| in all new files, and a factored header that sets up debugging defines. These files are not yet part of the build, but will become so with my next checkin
This commit is contained in:
scc%mozilla.org
Родитель
9df1ab2d5c
Коммит
0f00c47797
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@ -0,0 +1,37 @@
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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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/
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* The Initial Developer of the Original Code is Netscape
|
||||
* Communications. Portions created by Netscape Communications are
|
||||
* Copyright (C) 2001 by Netscape Communications. All
|
||||
* Rights Reserved.
|
||||
*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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*/
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/* nsStringDefines.h --- preprocessor definitions common across all string files */
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#ifndef nsStringDefines_h___
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#define nsStringDefines_h___
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#if !defined(DEBUG) || !defined(DEBUG_STRING)
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#define DEBUG_STRING 0
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#endif
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#if !defined(DEBUG) || !defined(DEBUG_STRING_STATS)
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#define DEBUG_STRING_STATS 0
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#endif
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#endif
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@ -0,0 +1,249 @@
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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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/
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* The Initial Developer of the Original Code is Netscape
|
||||
* Communications. Portions created by Netscape Communications are
|
||||
* Copyright (C) 2001 by Netscape Communications. All
|
||||
* Rights Reserved.
|
||||
*
|
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* Contributor(s):
|
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* Scott Collins <scc@mozilla.org> (original author)
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*/
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#ifndef nsXPIDLString_h___
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#define nsXPIDLString_h___
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#ifndef nsSharableString_h___
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#include "nsSharableString.h"
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#endif
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#if DEBUG_STRING_STATS
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#include <stdio.h>
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#endif
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/**
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* |nsXPIDLC?String| extends |nsSharableC?String| with the ability
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* to defer calculation of its length. This is crucial to allowing
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* the |getter_Copies| assignment behavior.
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*
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* The mechanism relies on the fact that |GetSharedBufferHandle|
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* must be called before any other object can share the buffer,
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* and as the default implementation for |GetBufferHandle|, which is
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* the operation on which all other flat string operations are based.
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* A valid handle always contains a non-|NULL| data start and end.
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* After use as an `out' string pointer parameter, an |nsXPIDLC?String|'s
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* handle will have a non-|NULL| data start, but its data end will be
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* |NULL|. This is the signal that the length needs to be recalculated.
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* |GetSharedBufferHandle| detects this situation and repairs it.
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*
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* An |nsXPIDLC?String| is now a sharable object, just like |nsSharableC?String|.
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* This simple implementation always allocates an intermediary handle
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* object. This cost might turn out to be a burden, it's something we'll
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* want to measure. A couple of optimizations spring to mind if allocation
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* of the handle objects shows up on the performance radar:
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* (1) introduce a custom allocator for the handles, e.g., keep free lists
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* or arena allocate them, or (2) fatten up the |nsXPIDLC?String| with a
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* local handle, and only allocate a shared handle in the event that
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* someone actually wants to share. Both of these alternatives add
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* complexity or space costs, and so we start with the simplest thing
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* that could possibly work :-)
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*/
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class NS_COM nsXPIDLString
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: public nsSharableString
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{
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public:
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nsXPIDLString()
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{
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#if DEBUG_STRING_STATS
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++sCreatedCount;
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if ( ++sAliveCount > sHighWaterCount )
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sHighWaterCount = sAliveCount;
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#endif
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}
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nsXPIDLString( const nsXPIDLString& aString )
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: nsSharableString(aString.GetSharedBufferHandle())
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// copy-constructor required (or else C++ generates one for us)
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{
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#if DEBUG_STRING_STATS
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++sCreatedCount;
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if ( ++sAliveCount > sHighWaterCount )
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sHighWaterCount = sAliveCount;
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#endif
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}
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#if DEBUG_STRING_STATS
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~nsXPIDLString()
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{
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--sAliveCount;
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}
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#endif
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nsXPIDLString&
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operator=( const nsXPIDLString& rhs )
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// copy-assignment operator required (or else C++ generates one for us)
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{
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// self-assignment is handled by the underlying |nsAutoBufferHandle|
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mBuffer = rhs.GetSharedBufferHandle();
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return *this;
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}
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void Adopt( PRUnichar* aNewValue ) { *PrepareForUseAsOutParam() = aNewValue; }
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// deprecated, to be eliminated
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operator const PRUnichar*() const { return get(); }
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class getter_Copies_t
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{
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public:
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getter_Copies_t( nsXPIDLString& aString ) : mString(&aString) { }
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// getter_Copies_t( const getter_Copies_t& ); // auto-generated copy-constructor OK
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// getter_Copies_t& operator=( const getter_Copies_t& ); // auto-generated assignment operator OK
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operator PRUnichar**() const { return mString->PrepareForUseAsOutParam(); }
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private:
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nsXPIDLString* mString;
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};
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friend class getter_Copies_t;
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protected:
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#if DEBUG_STRING_STATS
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virtual const nsBufferHandle<PRUnichar>* GetFlatBufferHandle() const;
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virtual const nsBufferHandle<PRUnichar>* GetBufferHandle() const;
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#endif
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virtual const nsSharedBufferHandle<PRUnichar>* GetSharedBufferHandle() const;
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// overridden to fix the length after `out' parameter assignment, if necessary
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PRUnichar** PrepareForUseAsOutParam();
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#if DEBUG_STRING_STATS
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static size_t sCreatedCount; // total number of |nsXPIDLString|s ever created
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static size_t sAliveCount; // total number of |nsXPIDLStrings|s alive right now
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static size_t sHighWaterCount; // greatest number of |nsXPIDLString|s alive at once
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static size_t sAssignCount; // total number of times |nsXPIDLString|s were
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// assigned into with |getter_Copies|
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static size_t sShareCount; // total number times |nsXPIDLString|s were asked to share
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public:
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static void DebugPrintStats( FILE* );
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#endif
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};
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inline
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nsXPIDLString::getter_Copies_t
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getter_Copies( nsXPIDLString& aString )
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{
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return nsXPIDLString::getter_Copies_t(aString);
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}
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class NS_COM nsXPIDLCString
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: public nsSharableCString
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{
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public:
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nsXPIDLCString()
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{
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#if DEBUG_STRING_STATS
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++sCreatedCount;
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if ( ++sAliveCount > sHighWaterCount )
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sHighWaterCount = sAliveCount;
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#endif
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}
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nsXPIDLCString( const nsXPIDLCString& aString )
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: nsSharableCString(aString.GetSharedBufferHandle())
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// copy-constructor required (or else C++ generates one for us)
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{
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#if DEBUG_STRING_STATS
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++sCreatedCount;
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if ( ++sAliveCount > sHighWaterCount )
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sHighWaterCount = sAliveCount;
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#endif
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}
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#if DEBUG_STRING_STATS
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~nsXPIDLCString()
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{
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--sAliveCount;
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}
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#endif
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nsXPIDLCString&
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operator=( const nsXPIDLCString& rhs )
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// copy-assignment operator required (or else C++ generates one for us)
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{
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// self-assignment is handled by the underlying |nsAutoBufferHandle|
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mBuffer = rhs.GetSharedBufferHandle();
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return *this;
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}
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void Adopt( char* aNewValue ) { *PrepareForUseAsOutParam() = aNewValue; }
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// deprecated, to be eliminated
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operator const char*() const { return get(); }
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class getter_Copies_t
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{
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public:
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getter_Copies_t( nsXPIDLCString& aString ) : mString(&aString) { }
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// getter_Copies_t( const getter_Copies_t& ); // auto-generated copy-constructor OK
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// getter_Copies_t& operator=( const getter_Copies_t& ); // auto-generated assignment operator OK
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operator char**() const { return mString->PrepareForUseAsOutParam(); }
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private:
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nsXPIDLCString* mString;
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};
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friend class getter_Copies_t;
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protected:
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#if DEBUG_STRING_STATS
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virtual const nsBufferHandle<char>* GetFlatBufferHandle() const;
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virtual const nsBufferHandle<char>* GetBufferHandle() const;
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#endif
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virtual const nsSharedBufferHandle<char>* GetSharedBufferHandle() const;
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// overridden to fix the length after `out' parameter assignment, if necessary
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char** PrepareForUseAsOutParam();
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#if DEBUG_STRING_STATS
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static size_t sCreatedCount; // total number of |nsXPIDLCString|s ever created
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static size_t sAliveCount; // total number of |nsXPIDLCStrings|s alive right now
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static size_t sHighWaterCount; // greatest number of |nsXPIDLCString|s alive at once
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static size_t sAssignCount; // total number of times |nsXPIDLCString|s were
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// assigned into with |getter_Copies|
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static size_t sShareCount; // total number times |nsXPIDLCString|s were asked to share
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public:
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static void DebugPrintStats( FILE* );
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#endif
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};
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inline
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nsXPIDLCString::getter_Copies_t
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getter_Copies( nsXPIDLCString& aString )
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{
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return nsXPIDLCString::getter_Copies_t(aString);
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}
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#endif /* !defined(nsXPIDLString_h___) */
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@ -0,0 +1,182 @@
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
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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/
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* The Initial Developer of the Original Code is Netscape
|
||||
* Communications. Portions created by Netscape Communications are
|
||||
* Copyright (C) 2001 by Netscape Communications. All
|
||||
* Rights Reserved.
|
||||
*
|
||||
* Contributor(s):
|
||||
* Scott Collins <scc@mozilla.org> (original author)
|
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*/
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#include "nsXPIDLString.h"
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#if DEBUG_STRING_STATS
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size_t nsXPIDLString::sCreatedCount = 0;
|
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size_t nsXPIDLString::sAliveCount = 0;
|
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size_t nsXPIDLString::sHighWaterCount = 0;
|
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size_t nsXPIDLString::sAssignCount = 0;
|
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size_t nsXPIDLString::sShareCount = 0;
|
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size_t nsXPIDLCString::sCreatedCount = 0;
|
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size_t nsXPIDLCString::sAliveCount = 0;
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size_t nsXPIDLCString::sHighWaterCount = 0;
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size_t nsXPIDLCString::sAssignCount = 0;
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size_t nsXPIDLCString::sShareCount = 0;
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#endif
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template <class CharT>
|
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class nsImportedStringHandle
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: public nsFlexBufferHandle<CharT>
|
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{
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public:
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nsImportedStringHandle() : nsFlexBufferHandle<CharT>(0, 0, 0, 0) { }
|
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|
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CharT** AddressOfDataStart() { return &mDataStart; }
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void RecalculateBoundaries() const;
|
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};
|
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template <class CharT>
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void
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nsImportedStringHandle<CharT>::RecalculateBoundaries() const
|
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{
|
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size_t data_length = 0;
|
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size_t storage_length = 0;
|
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|
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CharT* data_start = NS_CONST_CAST(CharT*, DataStart());
|
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if ( data_start )
|
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{
|
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data_length = nsCharTraits<CharT>::length(data_start);
|
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storage_length = data_length + 1;
|
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}
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nsImportedStringHandle<CharT>* mutable_this = NS_CONST_CAST(nsImportedStringHandle<CharT>*, this);
|
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mutable_this->DataEnd(data_start+data_length);
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|
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mutable_this->StorageStart(data_start);
|
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mutable_this->StorageEnd(data_start+storage_length);
|
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}
|
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|
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|
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#if DEBUG_STRING_STATS
|
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const nsBufferHandle<PRUnichar>*
|
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nsXPIDLString::GetFlatBufferHandle() const
|
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{
|
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--sShareCount;
|
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return GetSharedBufferHandle();
|
||||
}
|
||||
|
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|
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const nsBufferHandle<PRUnichar>*
|
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nsXPIDLString::GetBufferHandle() const
|
||||
{
|
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--sShareCount;
|
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return GetSharedBufferHandle();
|
||||
}
|
||||
|
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|
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void
|
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nsXPIDLString::DebugPrintStats( FILE* aOutFile )
|
||||
{
|
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fprintf(aOutFile, "nsXPIDLString stats: %ld alive now [%ld max] of %ld created; %ld getter_Copies, %ld attempts to share\n",
|
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sAliveCount, sHighWaterCount, sCreatedCount, sAssignCount, sShareCount);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
const nsSharedBufferHandle<PRUnichar>*
|
||||
nsXPIDLString::GetSharedBufferHandle() const
|
||||
{
|
||||
const nsImportedStringHandle<PRUnichar>* answer = NS_STATIC_CAST(const nsImportedStringHandle<PRUnichar>*, mBuffer.get());
|
||||
|
||||
if ( !answer->DataEnd() )
|
||||
answer->RecalculateBoundaries();
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
++sShareCount;
|
||||
#endif
|
||||
return answer;
|
||||
}
|
||||
|
||||
|
||||
PRUnichar**
|
||||
nsXPIDLString::PrepareForUseAsOutParam()
|
||||
{
|
||||
nsImportedStringHandle<PRUnichar>* handle = new nsImportedStringHandle<PRUnichar>();
|
||||
NS_ASSERTION(handle, "Trouble! We couldn't get a new handle during |getter_Copies|.");
|
||||
|
||||
mBuffer = handle;
|
||||
#if DEBUG_STRING_STATS
|
||||
++sAssignCount;
|
||||
#endif
|
||||
return handle->AddressOfDataStart();
|
||||
}
|
||||
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
const nsBufferHandle<char>*
|
||||
nsXPIDLCString::GetFlatBufferHandle() const
|
||||
{
|
||||
--sShareCount;
|
||||
return GetSharedBufferHandle();
|
||||
}
|
||||
|
||||
|
||||
const nsBufferHandle<char>*
|
||||
nsXPIDLCString::GetBufferHandle() const
|
||||
{
|
||||
--sShareCount;
|
||||
return GetSharedBufferHandle();
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
nsXPIDLCString::DebugPrintStats( FILE* aOutFile )
|
||||
{
|
||||
fprintf(aOutFile, "nsXPIDLCString stats: %ld alive now [%ld max] of %ld created; %ld getter_Copies, %ld attempts to share\n",
|
||||
sAliveCount, sHighWaterCount, sCreatedCount, sAssignCount, sShareCount);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
const nsSharedBufferHandle<char>*
|
||||
nsXPIDLCString::GetSharedBufferHandle() const
|
||||
{
|
||||
const nsImportedStringHandle<char>* answer = NS_STATIC_CAST(const nsImportedStringHandle<char>*, mBuffer.get());
|
||||
|
||||
if ( !answer->DataEnd() )
|
||||
answer->RecalculateBoundaries();
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
++sShareCount;
|
||||
#endif
|
||||
return answer;
|
||||
}
|
||||
|
||||
|
||||
char**
|
||||
nsXPIDLCString::PrepareForUseAsOutParam()
|
||||
{
|
||||
nsImportedStringHandle<char>* handle = new nsImportedStringHandle<char>();
|
||||
NS_ASSERTION(handle, "Trouble! We couldn't get a new handle during |getter_Copies|.");
|
||||
|
||||
mBuffer = handle;
|
||||
#if DEBUG_STRING_STATS
|
||||
++sAssignCount;
|
||||
#endif
|
||||
return handle->AddressOfDataStart();
|
||||
}
|
||||
|
|
@ -0,0 +1,37 @@
|
|||
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
||||
/*
|
||||
* 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.
|
||||
*
|
||||
* The Initial Developer of the Original Code is Netscape
|
||||
* Communications. Portions created by Netscape Communications are
|
||||
* Copyright (C) 2001 by Netscape Communications. All
|
||||
* Rights Reserved.
|
||||
*
|
||||
* Contributor(s):
|
||||
* Scott Collins <scc@mozilla.org> (original author)
|
||||
*/
|
||||
|
||||
/* nsStringDefines.h --- preprocessor definitions common across all string files */
|
||||
|
||||
#ifndef nsStringDefines_h___
|
||||
#define nsStringDefines_h___
|
||||
|
||||
#if !defined(DEBUG) || !defined(DEBUG_STRING)
|
||||
#define DEBUG_STRING 0
|
||||
#endif
|
||||
|
||||
#if !defined(DEBUG) || !defined(DEBUG_STRING_STATS)
|
||||
#define DEBUG_STRING_STATS 0
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,249 @@
|
|||
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
||||
/*
|
||||
* 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.
|
||||
*
|
||||
* The Initial Developer of the Original Code is Netscape
|
||||
* Communications. Portions created by Netscape Communications are
|
||||
* Copyright (C) 2001 by Netscape Communications. All
|
||||
* Rights Reserved.
|
||||
*
|
||||
* Contributor(s):
|
||||
* Scott Collins <scc@mozilla.org> (original author)
|
||||
*/
|
||||
|
||||
#ifndef nsXPIDLString_h___
|
||||
#define nsXPIDLString_h___
|
||||
|
||||
#ifndef nsSharableString_h___
|
||||
#include "nsSharableString.h"
|
||||
#endif
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
#include <stdio.h>
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* |nsXPIDLC?String| extends |nsSharableC?String| with the ability
|
||||
* to defer calculation of its length. This is crucial to allowing
|
||||
* the |getter_Copies| assignment behavior.
|
||||
*
|
||||
* The mechanism relies on the fact that |GetSharedBufferHandle|
|
||||
* must be called before any other object can share the buffer,
|
||||
* and as the default implementation for |GetBufferHandle|, which is
|
||||
* the operation on which all other flat string operations are based.
|
||||
* A valid handle always contains a non-|NULL| data start and end.
|
||||
* After use as an `out' string pointer parameter, an |nsXPIDLC?String|'s
|
||||
* handle will have a non-|NULL| data start, but its data end will be
|
||||
* |NULL|. This is the signal that the length needs to be recalculated.
|
||||
* |GetSharedBufferHandle| detects this situation and repairs it.
|
||||
*
|
||||
* An |nsXPIDLC?String| is now a sharable object, just like |nsSharableC?String|.
|
||||
* This simple implementation always allocates an intermediary handle
|
||||
* object. This cost might turn out to be a burden, it's something we'll
|
||||
* want to measure. A couple of optimizations spring to mind if allocation
|
||||
* of the handle objects shows up on the performance radar:
|
||||
* (1) introduce a custom allocator for the handles, e.g., keep free lists
|
||||
* or arena allocate them, or (2) fatten up the |nsXPIDLC?String| with a
|
||||
* local handle, and only allocate a shared handle in the event that
|
||||
* someone actually wants to share. Both of these alternatives add
|
||||
* complexity or space costs, and so we start with the simplest thing
|
||||
* that could possibly work :-)
|
||||
*/
|
||||
|
||||
class NS_COM nsXPIDLString
|
||||
: public nsSharableString
|
||||
{
|
||||
public:
|
||||
nsXPIDLString()
|
||||
{
|
||||
#if DEBUG_STRING_STATS
|
||||
++sCreatedCount;
|
||||
if ( ++sAliveCount > sHighWaterCount )
|
||||
sHighWaterCount = sAliveCount;
|
||||
#endif
|
||||
}
|
||||
|
||||
nsXPIDLString( const nsXPIDLString& aString )
|
||||
: nsSharableString(aString.GetSharedBufferHandle())
|
||||
// copy-constructor required (or else C++ generates one for us)
|
||||
{
|
||||
#if DEBUG_STRING_STATS
|
||||
++sCreatedCount;
|
||||
if ( ++sAliveCount > sHighWaterCount )
|
||||
sHighWaterCount = sAliveCount;
|
||||
#endif
|
||||
}
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
~nsXPIDLString()
|
||||
{
|
||||
--sAliveCount;
|
||||
}
|
||||
#endif
|
||||
|
||||
nsXPIDLString&
|
||||
operator=( const nsXPIDLString& rhs )
|
||||
// copy-assignment operator required (or else C++ generates one for us)
|
||||
{
|
||||
// self-assignment is handled by the underlying |nsAutoBufferHandle|
|
||||
mBuffer = rhs.GetSharedBufferHandle();
|
||||
return *this;
|
||||
}
|
||||
|
||||
void Adopt( PRUnichar* aNewValue ) { *PrepareForUseAsOutParam() = aNewValue; }
|
||||
|
||||
// deprecated, to be eliminated
|
||||
operator const PRUnichar*() const { return get(); }
|
||||
|
||||
|
||||
class getter_Copies_t
|
||||
{
|
||||
public:
|
||||
getter_Copies_t( nsXPIDLString& aString ) : mString(&aString) { }
|
||||
// getter_Copies_t( const getter_Copies_t& ); // auto-generated copy-constructor OK
|
||||
// getter_Copies_t& operator=( const getter_Copies_t& ); // auto-generated assignment operator OK
|
||||
|
||||
operator PRUnichar**() const { return mString->PrepareForUseAsOutParam(); }
|
||||
|
||||
private:
|
||||
nsXPIDLString* mString;
|
||||
};
|
||||
|
||||
friend class getter_Copies_t;
|
||||
|
||||
protected:
|
||||
#if DEBUG_STRING_STATS
|
||||
virtual const nsBufferHandle<PRUnichar>* GetFlatBufferHandle() const;
|
||||
virtual const nsBufferHandle<PRUnichar>* GetBufferHandle() const;
|
||||
#endif
|
||||
virtual const nsSharedBufferHandle<PRUnichar>* GetSharedBufferHandle() const;
|
||||
// overridden to fix the length after `out' parameter assignment, if necessary
|
||||
|
||||
PRUnichar** PrepareForUseAsOutParam();
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
static size_t sCreatedCount; // total number of |nsXPIDLString|s ever created
|
||||
static size_t sAliveCount; // total number of |nsXPIDLStrings|s alive right now
|
||||
static size_t sHighWaterCount; // greatest number of |nsXPIDLString|s alive at once
|
||||
static size_t sAssignCount; // total number of times |nsXPIDLString|s were
|
||||
// assigned into with |getter_Copies|
|
||||
static size_t sShareCount; // total number times |nsXPIDLString|s were asked to share
|
||||
|
||||
public:
|
||||
static void DebugPrintStats( FILE* );
|
||||
#endif
|
||||
};
|
||||
|
||||
inline
|
||||
nsXPIDLString::getter_Copies_t
|
||||
getter_Copies( nsXPIDLString& aString )
|
||||
{
|
||||
return nsXPIDLString::getter_Copies_t(aString);
|
||||
}
|
||||
|
||||
|
||||
|
||||
class NS_COM nsXPIDLCString
|
||||
: public nsSharableCString
|
||||
{
|
||||
public:
|
||||
nsXPIDLCString()
|
||||
{
|
||||
#if DEBUG_STRING_STATS
|
||||
++sCreatedCount;
|
||||
if ( ++sAliveCount > sHighWaterCount )
|
||||
sHighWaterCount = sAliveCount;
|
||||
#endif
|
||||
}
|
||||
|
||||
nsXPIDLCString( const nsXPIDLCString& aString )
|
||||
: nsSharableCString(aString.GetSharedBufferHandle())
|
||||
// copy-constructor required (or else C++ generates one for us)
|
||||
{
|
||||
#if DEBUG_STRING_STATS
|
||||
++sCreatedCount;
|
||||
if ( ++sAliveCount > sHighWaterCount )
|
||||
sHighWaterCount = sAliveCount;
|
||||
#endif
|
||||
}
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
~nsXPIDLCString()
|
||||
{
|
||||
--sAliveCount;
|
||||
}
|
||||
#endif
|
||||
|
||||
nsXPIDLCString&
|
||||
operator=( const nsXPIDLCString& rhs )
|
||||
// copy-assignment operator required (or else C++ generates one for us)
|
||||
{
|
||||
// self-assignment is handled by the underlying |nsAutoBufferHandle|
|
||||
mBuffer = rhs.GetSharedBufferHandle();
|
||||
return *this;
|
||||
}
|
||||
|
||||
void Adopt( char* aNewValue ) { *PrepareForUseAsOutParam() = aNewValue; }
|
||||
|
||||
// deprecated, to be eliminated
|
||||
operator const char*() const { return get(); }
|
||||
|
||||
|
||||
class getter_Copies_t
|
||||
{
|
||||
public:
|
||||
getter_Copies_t( nsXPIDLCString& aString ) : mString(&aString) { }
|
||||
// getter_Copies_t( const getter_Copies_t& ); // auto-generated copy-constructor OK
|
||||
// getter_Copies_t& operator=( const getter_Copies_t& ); // auto-generated assignment operator OK
|
||||
|
||||
operator char**() const { return mString->PrepareForUseAsOutParam(); }
|
||||
|
||||
private:
|
||||
nsXPIDLCString* mString;
|
||||
};
|
||||
|
||||
friend class getter_Copies_t;
|
||||
|
||||
protected:
|
||||
#if DEBUG_STRING_STATS
|
||||
virtual const nsBufferHandle<char>* GetFlatBufferHandle() const;
|
||||
virtual const nsBufferHandle<char>* GetBufferHandle() const;
|
||||
#endif
|
||||
virtual const nsSharedBufferHandle<char>* GetSharedBufferHandle() const;
|
||||
// overridden to fix the length after `out' parameter assignment, if necessary
|
||||
|
||||
char** PrepareForUseAsOutParam();
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
static size_t sCreatedCount; // total number of |nsXPIDLCString|s ever created
|
||||
static size_t sAliveCount; // total number of |nsXPIDLCStrings|s alive right now
|
||||
static size_t sHighWaterCount; // greatest number of |nsXPIDLCString|s alive at once
|
||||
static size_t sAssignCount; // total number of times |nsXPIDLCString|s were
|
||||
// assigned into with |getter_Copies|
|
||||
static size_t sShareCount; // total number times |nsXPIDLCString|s were asked to share
|
||||
|
||||
public:
|
||||
static void DebugPrintStats( FILE* );
|
||||
#endif
|
||||
};
|
||||
|
||||
inline
|
||||
nsXPIDLCString::getter_Copies_t
|
||||
getter_Copies( nsXPIDLCString& aString )
|
||||
{
|
||||
return nsXPIDLCString::getter_Copies_t(aString);
|
||||
}
|
||||
|
||||
#endif /* !defined(nsXPIDLString_h___) */
|
||||
|
|
@ -0,0 +1,182 @@
|
|||
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
||||
/*
|
||||
* 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.
|
||||
*
|
||||
* The Initial Developer of the Original Code is Netscape
|
||||
* Communications. Portions created by Netscape Communications are
|
||||
* Copyright (C) 2001 by Netscape Communications. All
|
||||
* Rights Reserved.
|
||||
*
|
||||
* Contributor(s):
|
||||
* Scott Collins <scc@mozilla.org> (original author)
|
||||
*/
|
||||
|
||||
#include "nsXPIDLString.h"
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
size_t nsXPIDLString::sCreatedCount = 0;
|
||||
size_t nsXPIDLString::sAliveCount = 0;
|
||||
size_t nsXPIDLString::sHighWaterCount = 0;
|
||||
size_t nsXPIDLString::sAssignCount = 0;
|
||||
size_t nsXPIDLString::sShareCount = 0;
|
||||
|
||||
size_t nsXPIDLCString::sCreatedCount = 0;
|
||||
size_t nsXPIDLCString::sAliveCount = 0;
|
||||
size_t nsXPIDLCString::sHighWaterCount = 0;
|
||||
size_t nsXPIDLCString::sAssignCount = 0;
|
||||
size_t nsXPIDLCString::sShareCount = 0;
|
||||
#endif
|
||||
|
||||
|
||||
template <class CharT>
|
||||
class nsImportedStringHandle
|
||||
: public nsFlexBufferHandle<CharT>
|
||||
{
|
||||
public:
|
||||
nsImportedStringHandle() : nsFlexBufferHandle<CharT>(0, 0, 0, 0) { }
|
||||
|
||||
CharT** AddressOfDataStart() { return &mDataStart; }
|
||||
void RecalculateBoundaries() const;
|
||||
};
|
||||
|
||||
|
||||
template <class CharT>
|
||||
void
|
||||
nsImportedStringHandle<CharT>::RecalculateBoundaries() const
|
||||
{
|
||||
size_t data_length = 0;
|
||||
size_t storage_length = 0;
|
||||
|
||||
CharT* data_start = NS_CONST_CAST(CharT*, DataStart());
|
||||
if ( data_start )
|
||||
{
|
||||
data_length = nsCharTraits<CharT>::length(data_start);
|
||||
storage_length = data_length + 1;
|
||||
}
|
||||
|
||||
nsImportedStringHandle<CharT>* mutable_this = NS_CONST_CAST(nsImportedStringHandle<CharT>*, this);
|
||||
mutable_this->DataEnd(data_start+data_length);
|
||||
|
||||
mutable_this->StorageStart(data_start);
|
||||
mutable_this->StorageEnd(data_start+storage_length);
|
||||
}
|
||||
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
const nsBufferHandle<PRUnichar>*
|
||||
nsXPIDLString::GetFlatBufferHandle() const
|
||||
{
|
||||
--sShareCount;
|
||||
return GetSharedBufferHandle();
|
||||
}
|
||||
|
||||
|
||||
const nsBufferHandle<PRUnichar>*
|
||||
nsXPIDLString::GetBufferHandle() const
|
||||
{
|
||||
--sShareCount;
|
||||
return GetSharedBufferHandle();
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
nsXPIDLString::DebugPrintStats( FILE* aOutFile )
|
||||
{
|
||||
fprintf(aOutFile, "nsXPIDLString stats: %ld alive now [%ld max] of %ld created; %ld getter_Copies, %ld attempts to share\n",
|
||||
sAliveCount, sHighWaterCount, sCreatedCount, sAssignCount, sShareCount);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
const nsSharedBufferHandle<PRUnichar>*
|
||||
nsXPIDLString::GetSharedBufferHandle() const
|
||||
{
|
||||
const nsImportedStringHandle<PRUnichar>* answer = NS_STATIC_CAST(const nsImportedStringHandle<PRUnichar>*, mBuffer.get());
|
||||
|
||||
if ( !answer->DataEnd() )
|
||||
answer->RecalculateBoundaries();
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
++sShareCount;
|
||||
#endif
|
||||
return answer;
|
||||
}
|
||||
|
||||
|
||||
PRUnichar**
|
||||
nsXPIDLString::PrepareForUseAsOutParam()
|
||||
{
|
||||
nsImportedStringHandle<PRUnichar>* handle = new nsImportedStringHandle<PRUnichar>();
|
||||
NS_ASSERTION(handle, "Trouble! We couldn't get a new handle during |getter_Copies|.");
|
||||
|
||||
mBuffer = handle;
|
||||
#if DEBUG_STRING_STATS
|
||||
++sAssignCount;
|
||||
#endif
|
||||
return handle->AddressOfDataStart();
|
||||
}
|
||||
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
const nsBufferHandle<char>*
|
||||
nsXPIDLCString::GetFlatBufferHandle() const
|
||||
{
|
||||
--sShareCount;
|
||||
return GetSharedBufferHandle();
|
||||
}
|
||||
|
||||
|
||||
const nsBufferHandle<char>*
|
||||
nsXPIDLCString::GetBufferHandle() const
|
||||
{
|
||||
--sShareCount;
|
||||
return GetSharedBufferHandle();
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
nsXPIDLCString::DebugPrintStats( FILE* aOutFile )
|
||||
{
|
||||
fprintf(aOutFile, "nsXPIDLCString stats: %ld alive now [%ld max] of %ld created; %ld getter_Copies, %ld attempts to share\n",
|
||||
sAliveCount, sHighWaterCount, sCreatedCount, sAssignCount, sShareCount);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
const nsSharedBufferHandle<char>*
|
||||
nsXPIDLCString::GetSharedBufferHandle() const
|
||||
{
|
||||
const nsImportedStringHandle<char>* answer = NS_STATIC_CAST(const nsImportedStringHandle<char>*, mBuffer.get());
|
||||
|
||||
if ( !answer->DataEnd() )
|
||||
answer->RecalculateBoundaries();
|
||||
|
||||
#if DEBUG_STRING_STATS
|
||||
++sShareCount;
|
||||
#endif
|
||||
return answer;
|
||||
}
|
||||
|
||||
|
||||
char**
|
||||
nsXPIDLCString::PrepareForUseAsOutParam()
|
||||
{
|
||||
nsImportedStringHandle<char>* handle = new nsImportedStringHandle<char>();
|
||||
NS_ASSERTION(handle, "Trouble! We couldn't get a new handle during |getter_Copies|.");
|
||||
|
||||
mBuffer = handle;
|
||||
#if DEBUG_STRING_STATS
|
||||
++sAssignCount;
|
||||
#endif
|
||||
return handle->AddressOfDataStart();
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче