JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / API / OpaqueJSString.cpp

diff --git a/API/OpaqueJSString.cpp b/API/OpaqueJSString.cpp
index f740abe3b135c36d24aaba853387b1ffdb825275..07a79ad99e6dc7f31c5f8fbaa9241ef12fea24d3 100644 (file)
--- a/API/OpaqueJSString.cpp
+++ b/API/OpaqueJSString.cpp
@@ -10,10 +10,10 @@
  *    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 COMPUTER, INC. ``AS IS'' AND ANY
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 COMPUTER, INC. OR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * 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
@@ -26,30 +26,84 @@
 #include "config.h"
 #include "OpaqueJSString.h"
 
-#include <interpreter/CallFrame.h>
-#include <runtime/JSGlobalObject.h>
-#include <runtime/Identifier.h>
+#include "CallFrame.h"
+#include "Identifier.h"
+#include "IdentifierInlines.h"
+#include "JSGlobalObject.h"
+#include <wtf/text/StringView.h>
 
 using namespace JSC;
 
-PassRefPtr<OpaqueJSString> OpaqueJSString::create(const UString& ustring)
+RefPtr<OpaqueJSString> OpaqueJSString::create(const String& string)
 {
-    if (!ustring.isNull())
-        return adoptRef(new OpaqueJSString(ustring.data(), ustring.size()));
-    return 0;
+    if (string.isNull())
+        return nullptr;
+
+    return adoptRef(new OpaqueJSString(string));
+}
+
+OpaqueJSString::~OpaqueJSString()
+{
+    // m_characters is put in a local here to avoid an extra atomic load.
+    UChar* characters = m_characters;
+    if (!characters)
+        return;
+
+    if (!m_string.is8Bit() && m_string.characters16() == characters)
+        return;
+
+    fastFree(characters);
+}
+
+String OpaqueJSString::string() const
+{
+    // Return a copy of the wrapped string, because the caller may make it an Identifier.
+    return m_string.isolatedCopy();
+}
+
+Identifier OpaqueJSString::identifier(VM* vm) const
+{
+    if (m_string.isNull())
+        return Identifier();
+
+    if (m_string.isEmpty())
+        return Identifier(Identifier::EmptyIdentifier);
+
+    if (m_string.is8Bit())
+        return Identifier::fromString(vm, m_string.characters8(), m_string.length());
+
+    return Identifier::fromString(vm, m_string.characters16(), m_string.length());
 }
 
-UString OpaqueJSString::ustring() const
+const UChar* OpaqueJSString::characters()
 {
-    if (this && m_characters)
-        return UString(m_characters, m_length);
-    return UString::null();
+    // m_characters is put in a local here to avoid an extra atomic load.
+    UChar* characters = m_characters;
+    if (characters)
+        return characters;
+
+    if (m_string.isNull())
+        return nullptr;
+
+    unsigned length = m_string.length();
+    UChar* newCharacters = static_cast<UChar*>(fastMalloc(length * sizeof(UChar)));
+    StringView(m_string).getCharactersWithUpconvert(newCharacters);
+
+    if (!m_characters.compare_exchange_strong(characters, newCharacters)) {
+        fastFree(newCharacters);
+        return characters;
+    }
+
+    return newCharacters;
 }
 
-Identifier OpaqueJSString::identifier(JSGlobalData* globalData) const
+bool OpaqueJSString::equal(const OpaqueJSString* a, const OpaqueJSString* b)
 {
-    if (!this || !m_characters)
-        return Identifier(globalData, static_cast<const char*>(0));
+    if (a == b)
+        return true;
+
+    if (!a || !b)
+        return false;
 
-    return Identifier(globalData, m_characters, m_length);
+    return a->m_string == b->m_string;
 }