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

git-svn-id: svn://10.0.0.236/trunk@98273 18797224-902f-48f8-a5cc-f745e15eee43
2001-06-29 11:25:08 +00:00
parent 3fb894fad0
commit ee60a98c74
6 changed files with 936 additions and 0 deletions
--- a/mozilla/string/src/nsXPIDLString.cpp
+++ b/mozilla/string/src/nsXPIDLString.cpp
@@ -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();
+  }