Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>

1 files changed, 172 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGLazyJSValue.cpp b/Source/JavaScriptCore/dfg/DFGLazyJSValue.cpp
new file mode 100644
index 000000000..6011490c9
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGLazyJSValue.cpp
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2013, 2014 Apple 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. ``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
+ * 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 "DFGLazyJSValue.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+JSValue LazyJSValue::getValue(VM& vm) const
+{
+    switch (m_kind) {
+    case KnownValue:
+        return value()->value();
+    case SingleCharacterString:
+        return jsSingleCharacterString(&vm, u.character);
+    case KnownStringImpl:
+        return jsString(&vm, u.stringImpl);
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+    return JSValue();
+}
+
+static TriState equalToSingleCharacter(JSValue value, UChar character)
+{
+    if (!value.isString())
+        return FalseTriState;
+    
+    JSString* jsString = asString(value);
+    if (jsString->length() != 1)
+        return FalseTriState;
+    
+    const StringImpl* string = jsString->tryGetValueImpl();
+    if (!string)
+        return MixedTriState;
+    
+    return triState(string->at(0) == character);
+}
+
+static TriState equalToStringImpl(JSValue value, StringImpl* stringImpl)
+{
+    if (!value.isString())
+        return FalseTriState;
+    
+    JSString* jsString = asString(value);
+    const StringImpl* string = jsString->tryGetValueImpl();
+    if (!string)
+        return MixedTriState;
+    
+    return triState(WTF::equal(stringImpl, string));
+}
+
+TriState LazyJSValue::strictEqual(const LazyJSValue& other) const
+{
+    switch (m_kind) {
+    case KnownValue:
+        switch (other.m_kind) {
+        case KnownValue:
+            return JSValue::pureStrictEqual(value()->value(), other.value()->value());
+        case SingleCharacterString:
+            return equalToSingleCharacter(value()->value(), other.character());
+        case KnownStringImpl:
+            return equalToStringImpl(value()->value(), other.stringImpl());
+        }
+        break;
+    case SingleCharacterString:
+        switch (other.m_kind) {
+        case SingleCharacterString:
+            return triState(character() == other.character());
+        case KnownStringImpl:
+            if (other.stringImpl()->length() != 1)
+                return FalseTriState;
+            return triState(other.stringImpl()->at(0) == character());
+        default:
+            return other.strictEqual(*this);
+        }
+        break;
+    case KnownStringImpl:
+        switch (other.m_kind) {
+        case KnownStringImpl:
+            return triState(WTF::equal(stringImpl(), other.stringImpl()));
+        default:
+            return other.strictEqual(*this);
+        }
+        break;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+    return FalseTriState;
+}
+
+uintptr_t LazyJSValue::switchLookupValue(SwitchKind kind) const
+{
+    // NB. Not every kind of JSValue will be able to give you a switch lookup
+    // value, and this method will assert, or do bad things, if you use it
+    // for a kind of value that can't.
+    switch (m_kind) {
+    case KnownValue:
+        switch (kind) {
+        case SwitchImm:
+            return value()->value().asInt32();
+        case SwitchCell:
+            return bitwise_cast<uintptr_t>(value()->value().asCell());
+        default:
+            RELEASE_ASSERT_NOT_REACHED();
+            return 0;
+        }
+    case SingleCharacterString:
+        switch (kind) {
+        case SwitchChar:
+            return character();
+        default:
+            RELEASE_ASSERT_NOT_REACHED();
+            return 0;
+        }
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+        return 0;
+    }
+}
+
+void LazyJSValue::dumpInContext(PrintStream& out, DumpContext* context) const
+{
+    switch (m_kind) {
+    case KnownValue:
+        value()->dumpInContext(out, context);
+        return;
+    case SingleCharacterString:
+        out.print("Lazy:SingleCharacterString(");
+        out.printf("%04X", static_cast<unsigned>(character()));
+        out.print(" / ", StringImpl::utf8ForCharacters(&u.character, 1), ")");
+        return;
+    case KnownStringImpl:
+        out.print("Lazy:String(", stringImpl(), ")");
+        return;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+void LazyJSValue::dump(PrintStream& out) const
+{
+    dumpInContext(out, 0);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+