Moved files under Source/bindings/v8 to Source/bindings/core/v8.

Source/bindings/v8/V8StringResource.cpp

-/*
- * Copyright (C) 2009 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "bindings/v8/V8StringResource.h"
-
-#include "bindings/v8/V8Binding.h"
-#include "core/inspector/BindingVisitors.h"
-#include "wtf/MainThread.h"
-
-namespace WebCore {
-
-template<class StringClass> struct StringTraits {
-    static const StringClass& fromStringResource(WebCoreStringResourceBase*);
-    template <typename V8StringTrait>
-    static StringClass fromV8String(v8::Handle<v8::String>, int);
-};
-
-template<>
-struct StringTraits<String> {
-    static const String& fromStringResource(WebCoreStringResourceBase* resource)
-    {
-        return resource->webcoreString();
-    }
-    template <typename V8StringTrait>
-    static String fromV8String(v8::Handle<v8::String>, int);
-};
-
-template<>
-struct StringTraits<AtomicString> {
-    static const AtomicString& fromStringResource(WebCoreStringResourceBase* resource)
-    {
-        return resource->atomicString();
-    }
-    template <typename V8StringTrait>
-    static AtomicString fromV8String(v8::Handle<v8::String>, int);
-};
-
-struct V8StringTwoBytesTrait {
-    typedef UChar CharType;
-    ALWAYS_INLINE static void write(v8::Handle<v8::String> v8String, CharType* buffer, int length)
-    {
-        v8String->Write(reinterpret_cast<uint16_t*>(buffer), 0, length);
-    }
-};
-
-struct V8StringOneByteTrait {
-    typedef LChar CharType;
-    ALWAYS_INLINE static void write(v8::Handle<v8::String> v8String, CharType* buffer, int length)
-    {
-        v8String->WriteOneByte(buffer, 0, length);
-    }
-};
-
-template <typename V8StringTrait>
-String StringTraits<String>::fromV8String(v8::Handle<v8::String> v8String, int length)
-{
-    ASSERT(v8String->Length() == length);
-    typename V8StringTrait::CharType* buffer;
-    String result = String::createUninitialized(length, buffer);
-    V8StringTrait::write(v8String, buffer, length);
-    return result;
-}
-
-template <typename V8StringTrait>
-AtomicString StringTraits<AtomicString>::fromV8String(v8::Handle<v8::String> v8String, int length)
-{
-    ASSERT(v8String->Length() == length);
-    static const int inlineBufferSize = 32 / sizeof(typename V8StringTrait::CharType);
-    if (length <= inlineBufferSize) {
-        typename V8StringTrait::CharType inlineBuffer[inlineBufferSize];
-        V8StringTrait::write(v8String, inlineBuffer, length);
-        return AtomicString(inlineBuffer, length);
-    }
-    typename V8StringTrait::CharType* buffer;
-    String string = String::createUninitialized(length, buffer);
-    V8StringTrait::write(v8String, buffer, length);
-    return AtomicString(string);
-}
-
-template<typename StringType>
-StringType v8StringToWebCoreString(v8::Handle<v8::String> v8String, ExternalMode external)
-{
-    {
-        // This portion of this function is very hot in certain Dromeao benchmarks.
-        v8::String::Encoding encoding;
-        v8::String::ExternalStringResourceBase* resource = v8String->GetExternalStringResourceBase(&encoding);
-        if (LIKELY(!!resource)) {
-            WebCoreStringResourceBase* base;
-            if (encoding == v8::String::ONE_BYTE_ENCODING)
-                base = static_cast<WebCoreStringResource8*>(resource);
-            else
-                base = static_cast<WebCoreStringResource16*>(resource);
-            return StringTraits<StringType>::fromStringResource(base);
-        }
-    }
-
-    int length = v8String->Length();
-    if (UNLIKELY(!length))
-        return StringType("");
-
-    bool oneByte = v8String->ContainsOnlyOneByte();
-    StringType result(oneByte ? StringTraits<StringType>::template fromV8String<V8StringOneByteTrait>(v8String, length) : StringTraits<StringType>::template fromV8String<V8StringTwoBytesTrait>(v8String, length));
-
-    if (external != Externalize || !v8String->CanMakeExternal())
-        return result;
-
-    if (result.is8Bit()) {
-        WebCoreStringResource8* stringResource = new WebCoreStringResource8(result);
-        if (UNLIKELY(!v8String->MakeExternal(stringResource)))
-            delete stringResource;
-    } else {
-        WebCoreStringResource16* stringResource = new WebCoreStringResource16(result);
-        if (UNLIKELY(!v8String->MakeExternal(stringResource)))
-            delete stringResource;
-    }
-    return result;
-}
-
-// Explicitly instantiate the above template with the expected parameterizations,
-// to ensure the compiler generates the code; otherwise link errors can result in GCC 4.4.
-template String v8StringToWebCoreString<String>(v8::Handle<v8::String>, ExternalMode);
-template AtomicString v8StringToWebCoreString<AtomicString>(v8::Handle<v8::String>, ExternalMode);
-
-// Fast but non thread-safe version.
-String int32ToWebCoreStringFast(int value)
-{
-    // Caching of small strings below is not thread safe: newly constructed AtomicString
-    // are not safely published.
-    ASSERT(isMainThread());
-
-    // Most numbers used are <= 100. Even if they aren't used there's very little cost in using the space.
-    const int kLowNumbers = 100;
-    DEFINE_STATIC_LOCAL(Vector<AtomicString>, lowNumbers, (kLowNumbers + 1));
-    String webCoreString;
-    if (0 <= value && value <= kLowNumbers) {
-        webCoreString = lowNumbers[value];
-        if (!webCoreString) {
-            AtomicString valueString = AtomicString::number(value);
-            lowNumbers[value] = valueString;
-            webCoreString = valueString;
-        }
-    } else
-        webCoreString = String::number(value);
-    return webCoreString;
-}
-
-String int32ToWebCoreString(int value)
-{
-    // If we are on the main thread (this should always true for non-workers), call the faster one.
-    if (isMainThread())
-        return int32ToWebCoreStringFast(value);
-    return String::number(value);
-}
-
-} // namespace WebCore