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/*
* 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)
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