Move files in wtf/ to platform/wtf/ (Part 9).

third_party/WebKit/Source/wtf/text/StringImplCF.cpp

-/*
- * Copyright (C) 2006, 2009, 2012 Apple Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#include "wtf/text/StringImpl.h"
-
-#if OS(MACOSX)
-
-#include "wtf/PassRefPtr.h"
-#include "wtf/RetainPtr.h"
-#include "wtf/Threading.h"
-#include "wtf/allocator/Partitions.h"
-#include <CoreFoundation/CoreFoundation.h>
-
-namespace WTF {
-
-namespace StringWrapperCFAllocator {
-
-static StringImpl* currentString;
-
-static const void* retain(const void* info) {
-  return info;
-}
-
-static void release(const void*) {
-  NOTREACHED();
-}
-
-static CFStringRef copyDescription(const void*) {
-  return CFSTR("WTF::String-based allocator");
-}
-
-static void* allocate(CFIndex size, CFOptionFlags, void*) {
-  StringImpl* underlyingString = 0;
-  if (isMainThread()) {
-    underlyingString = currentString;
-    if (underlyingString) {
-      currentString = 0;
-      underlyingString
-          ->ref();  // Balanced by call to deref in deallocate below.
-    }
-  }
-  StringImpl** header = static_cast<StringImpl**>(WTF::Partitions::fastMalloc(
-      sizeof(StringImpl*) + size, WTF_HEAP_PROFILER_TYPE_NAME(StringImpl*)));
-  *header = underlyingString;
-  return header + 1;
-}
-
-static void* reallocate(void* pointer, CFIndex newSize, CFOptionFlags, void*) {
-  size_t newAllocationSize = sizeof(StringImpl*) + newSize;
-  StringImpl** header = static_cast<StringImpl**>(pointer) - 1;
-  ASSERT(!*header);
-  header = static_cast<StringImpl**>(WTF::Partitions::fastRealloc(
-      header, newAllocationSize, WTF_HEAP_PROFILER_TYPE_NAME(StringImpl*)));
-  return header + 1;
-}
-
-static void deallocateOnMainThread(void* headerPointer) {
-  StringImpl** header = static_cast<StringImpl**>(headerPointer);
-  StringImpl* underlyingString = *header;
-  DCHECK(underlyingString);
-  underlyingString->deref();  // Balanced by call to ref in allocate above.
-  WTF::Partitions::fastFree(header);
-}
-
-static void deallocate(void* pointer, void*) {
-  StringImpl** header = static_cast<StringImpl**>(pointer) - 1;
-  StringImpl* underlyingString = *header;
-  if (!underlyingString) {
-    WTF::Partitions::fastFree(header);
-  } else {
-    if (!isMainThread()) {
-      internal::callOnMainThread(&deallocateOnMainThread, header);
-    } else {
-      underlyingString->deref();  // Balanced by call to ref in allocate above.
-      WTF::Partitions::fastFree(header);
-    }
-  }
-}
-
-static CFIndex preferredSize(CFIndex size, CFOptionFlags, void*) {
-  // FIXME: If FastMalloc provided a "good size" callback, we'd want to use it
-  // here.  Note that this optimization would help performance for strings
-  // created with the allocator that are mutable, and those typically are only
-  // created by callers who make a new string using the old string's allocator,
-  // such as some of the call sites in CFURL.
-  return size;
-}
-
-static CFAllocatorRef create() {
-  CFAllocatorContext context = {
-      0,        0,          retain,     release,      copyDescription,
-      allocate, reallocate, deallocate, preferredSize};
-  return CFAllocatorCreate(0, &context);
-}
-
-static CFAllocatorRef allocator() {
-  static CFAllocatorRef allocator = create();
-  return allocator;
-}
-
-}  // namespace StringWrapperCFAllocator
-
-RetainPtr<CFStringRef> StringImpl::createCFString() {
-  // Since garbage collection isn't compatible with custom allocators, we
-  // can't use the NoCopy variants of CFStringCreate*() when GC is enabled.
-  if (!m_length || !isMainThread()) {
-    if (is8Bit())
-      return adoptCF(CFStringCreateWithBytes(
-          0, reinterpret_cast<const UInt8*>(characters8()), m_length,
-          kCFStringEncodingISOLatin1, false));
-    return adoptCF(CFStringCreateWithCharacters(
-        0, reinterpret_cast<const UniChar*>(characters16()), m_length));
-  }
-  CFAllocatorRef allocator = StringWrapperCFAllocator::allocator();
-
-  // Put pointer to the StringImpl in a global so the allocator can store it
-  // with the CFString.
-  DCHECK(!StringWrapperCFAllocator::currentString);
-  StringWrapperCFAllocator::currentString = this;
-
-  CFStringRef string;
-  if (is8Bit())
-    string = CFStringCreateWithBytesNoCopy(
-        allocator, reinterpret_cast<const UInt8*>(characters8()), m_length,
-        kCFStringEncodingISOLatin1, false, kCFAllocatorNull);
-  else
-    string = CFStringCreateWithCharactersNoCopy(
-        allocator, reinterpret_cast<const UniChar*>(characters16()), m_length,
-        kCFAllocatorNull);
-  // CoreFoundation might not have to allocate anything, we clear currentString
-  // in case we did not execute allocate().
-  StringWrapperCFAllocator::currentString = 0;
-
-  return adoptCF(string);
-}
-
-// On StringImpl creation we could check if the allocator is the
-// StringWrapperCFAllocator.  If it is, then we could find the original
-// StringImpl and just return that.  But to do that we'd have to compute the
-// offset from CFStringRef to the allocated block; the CFStringRef is *not* at
-// the start of an allocated block. Testing shows 1000x more calls to
-// createCFString than calls to the create functions with the appropriate
-// allocator, so it's probably not urgent optimize that case.
-
-}  // namespace WTF
-
-#endif  // OS(MACOSX)