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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003-2019 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 "config.h"
#include "JSCJSValue.h"
#include "BooleanConstructor.h"
#include "BooleanPrototype.h"
#include "CustomGetterSetter.h"
#include "Error.h"
#include "ExceptionHelpers.h"
#include "GetterSetter.h"
#include "JSBigInt.h"
#include "JSCInlines.h"
#include "JSFunction.h"
#include "JSGlobalObject.h"
#include "NumberObject.h"
#include <wtf/MathExtras.h>
namespace JSC {
// ECMA 9.4
double JSValue::toInteger(JSGlobalObject* globalObject) const
{
if (isInt32())
return asInt32();
double d = toNumber(globalObject);
return std::isnan(d) ? 0.0 : trunc(d);
}
double JSValue::toIntegerPreserveNaN(JSGlobalObject* globalObject) const
{
if (isInt32())
return asInt32();
return trunc(toNumber(globalObject));
}
double JSValue::toLength(JSGlobalObject* globalObject) const
{
// ECMA 7.1.15
// http://www.ecma-international.org/ecma-262/6.0/#sec-tolength
double d = toInteger(globalObject);
if (d <= 0)
return 0.0;
if (std::isinf(d))
return maxSafeInteger();
return std::min(d, maxSafeInteger());
}
double JSValue::toNumberSlowCase(JSGlobalObject* globalObject) const
{
ASSERT(!isInt32() && !isDouble());
if (isCell())
return asCell()->toNumber(globalObject);
if (isTrue())
return 1.0;
return isUndefined() ? PNaN : 0; // null and false both convert to 0.
}
Optional<double> JSValue::toNumberFromPrimitive() const
{
if (isEmpty())
return WTF::nullopt;
if (isNumber())
return asNumber();
if (isBoolean())
return asBoolean();
if (isUndefined())
return PNaN;
if (isNull())
return 0;
return WTF::nullopt;
}
JSObject* JSValue::toObjectSlowCase(JSGlobalObject* globalObject) const
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(!isCell());
if (isInt32() || isDouble())
return constructNumber(globalObject, asValue());
if (isTrue() || isFalse())
return constructBooleanFromImmediateBoolean(globalObject, asValue());
ASSERT(isUndefinedOrNull());
throwException(globalObject, scope, createNotAnObjectError(globalObject, *this));
return nullptr;
}
JSValue JSValue::toThisSlowCase(JSGlobalObject* globalObject, ECMAMode ecmaMode) const
{
ASSERT(!isCell());
if (ecmaMode == StrictMode)
return *this;
if (isInt32() || isDouble())
return constructNumber(globalObject, asValue());
if (isTrue() || isFalse())
return constructBooleanFromImmediateBoolean(globalObject, asValue());
ASSERT(isUndefinedOrNull());
return globalObject->globalThis();
}
JSObject* JSValue::synthesizePrototype(JSGlobalObject* globalObject) const
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (isCell()) {
if (isString())
return globalObject->stringPrototype();
if (isBigInt())
return globalObject->bigIntPrototype();
ASSERT(isSymbol());
return globalObject->symbolPrototype();
}
if (isNumber())
return globalObject->numberPrototype();
if (isBoolean())
return globalObject->booleanPrototype();
ASSERT(isUndefinedOrNull());
throwException(globalObject, scope, createNotAnObjectError(globalObject, *this));
return nullptr;
}
// ECMA 8.7.2
bool JSValue::putToPrimitive(JSGlobalObject* globalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (Optional<uint32_t> index = parseIndex(propertyName))
RELEASE_AND_RETURN(scope, putToPrimitiveByIndex(globalObject, index.value(), value, slot.isStrictMode()));
// Check if there are any setters or getters in the prototype chain
JSObject* obj = synthesizePrototype(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !obj);
if (UNLIKELY(!obj))
return false;
JSValue prototype;
if (propertyName != vm.propertyNames->underscoreProto) {
while (true) {
Structure* structure = obj->structure(vm);
if (structure->hasReadOnlyOrGetterSetterPropertiesExcludingProto() || structure->typeInfo().hasPutPropertySecurityCheck())
break;
prototype = obj->getPrototype(vm, globalObject);
RETURN_IF_EXCEPTION(scope, false);
if (prototype.isNull())
return typeError(globalObject, scope, slot.isStrictMode(), ReadonlyPropertyWriteError);
obj = asObject(prototype);
}
}
for (; ; obj = asObject(prototype)) {
Structure* structure = obj->structure(vm);
if (UNLIKELY(structure->typeInfo().hasPutPropertySecurityCheck())) {
obj->methodTable(vm)->doPutPropertySecurityCheck(obj, globalObject, propertyName, slot);
RETURN_IF_EXCEPTION(scope, false);
}
unsigned attributes;
PropertyOffset offset = structure->get(vm, propertyName, attributes);
if (offset != invalidOffset) {
if (attributes & PropertyAttribute::ReadOnly)
return typeError(globalObject, scope, slot.isStrictMode(), ReadonlyPropertyWriteError);
JSValue gs = obj->getDirect(offset);
if (gs.isGetterSetter())
RELEASE_AND_RETURN(scope, callSetter(globalObject, *this, gs, value, slot.isStrictMode() ? StrictMode : NotStrictMode));
if (gs.isCustomGetterSetter())
return callCustomSetter(globalObject, gs, attributes & PropertyAttribute::CustomAccessor, obj, slot.thisValue(), value);
// If there's an existing property on the object or one of its
// prototypes it should be replaced, so break here.
break;
}
prototype = obj->getPrototype(vm, globalObject);
RETURN_IF_EXCEPTION(scope, false);
if (prototype.isNull())
break;
}
return typeError(globalObject, scope, slot.isStrictMode(), ReadonlyPropertyWriteError);
}
bool JSValue::putToPrimitiveByIndex(JSGlobalObject* globalObject, unsigned propertyName, JSValue value, bool shouldThrow)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (propertyName > MAX_ARRAY_INDEX) {
PutPropertySlot slot(*this, shouldThrow);
return putToPrimitive(globalObject, Identifier::from(vm, propertyName), value, slot);
}
JSObject* prototype = synthesizePrototype(globalObject);
EXCEPTION_ASSERT(!!scope.exception() == !prototype);
if (UNLIKELY(!prototype))
return false;
bool putResult = false;
bool success = prototype->attemptToInterceptPutByIndexOnHoleForPrototype(globalObject, *this, propertyName, value, shouldThrow, putResult);
RETURN_IF_EXCEPTION(scope, false);
if (success)
return putResult;
return typeError(globalObject, scope, shouldThrow, ReadonlyPropertyWriteError);
}
void JSValue::dump(PrintStream& out) const
{
dumpInContext(out, 0);
}
void JSValue::dumpInContext(PrintStream& out, DumpContext* context) const
{
dumpInContextAssumingStructure(
out, context, (!!*this && isCell()) ? asCell()->structure() : nullptr);
}
void JSValue::dumpInContextAssumingStructure(
PrintStream& out, DumpContext* context, Structure* structure) const
{
if (!*this)
out.print("<JSValue()>");
else if (isInt32())
out.printf("Int32: %d", asInt32());
else if (isDouble()) {
#if USE(JSVALUE64)
out.printf("Double: %lld, %lf", (long long)reinterpretDoubleToInt64(asDouble()), asDouble());
#else
union {
double asDouble;
uint32_t asTwoInt32s[2];
} u;
u.asDouble = asDouble();
out.printf("Double: %08x:%08x, %lf", u.asTwoInt32s[1], u.asTwoInt32s[0], asDouble());
#endif
} else if (isCell()) {
if (structure->classInfo()->isSubClassOf(JSString::info())) {
JSString* string = asString(asCell());
out.print("String");
if (string->isRope())
out.print(" (rope)");
const StringImpl* impl = string->tryGetValueImpl();
if (impl) {
if (impl->isAtom())
out.print(" (atomic)");
if (impl->isSymbol())
out.print(" (symbol)");
} else
out.print(" (unresolved)");
if (string->is8Bit())
out.print(",8Bit:(1)");
else
out.print(",8Bit:(0)");
out.print(",length:(", string->length(), ")");
out.print(": ", impl);
} else if (structure->classInfo()->isSubClassOf(RegExp::info()))
out.print("RegExp: ", *jsCast<RegExp*>(asCell()));
else if (structure->classInfo()->isSubClassOf(Symbol::info()))
out.print("Symbol: ", RawPointer(asCell()));
else if (structure->classInfo()->isSubClassOf(Structure::info()))
out.print("Structure: ", inContext(*jsCast<Structure*>(asCell()), context));
else if (structure->classInfo()->isSubClassOf(JSObject::info())) {
out.print("Object: ", RawPointer(asCell()));
out.print(" with butterfly ", RawPointer(asObject(asCell())->butterfly()));
out.print(" (Structure ", inContext(*structure, context), ")");
} else {
out.print("Cell: ", RawPointer(asCell()));
out.print(" (", inContext(*structure, context), ")");
}
#if USE(JSVALUE64)
out.print(", StructureID: ", asCell()->structureID());
#endif
} else if (isTrue())
out.print("True");
else if (isFalse())
out.print("False");
else if (isNull())
out.print("Null");
else if (isUndefined())
out.print("Undefined");
else
out.print("INVALID");
}
void JSValue::dumpForBacktrace(PrintStream& out) const
{
if (!*this)
out.print("<JSValue()>");
else if (isInt32())
out.printf("%d", asInt32());
else if (isDouble())
out.printf("%lf", asDouble());
else if (isCell()) {
VM& vm = asCell()->vm();
if (asCell()->inherits<JSString>(vm)) {
JSString* string = asString(asCell());
const StringImpl* impl = string->tryGetValueImpl();
if (impl)
out.print("\"", impl, "\"");
else
out.print("(unresolved string)");
} else if (asCell()->inherits<Structure>(vm)) {
out.print("Structure[ ", asCell()->structure()->classInfo()->className);
#if USE(JSVALUE64)
out.print(" ID: ", asCell()->structureID());
#endif
out.print("]: ", RawPointer(asCell()));
} else {
out.print("Cell[", asCell()->structure()->classInfo()->className);
#if USE(JSVALUE64)
out.print(" ID: ", asCell()->structureID());
#endif
out.print("]: ", RawPointer(asCell()));
}
} else if (isTrue())
out.print("True");
else if (isFalse())
out.print("False");
else if (isNull())
out.print("Null");
else if (isUndefined())
out.print("Undefined");
else
out.print("INVALID");
}
bool JSValue::isValidCallee()
{
return asObject(asCell())->globalObject();
}
JSString* JSValue::toStringSlowCase(JSGlobalObject* globalObject, bool returnEmptyStringOnError) const
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
auto errorValue = [&] () -> JSString* {
if (returnEmptyStringOnError)
return jsEmptyString(vm);
return nullptr;
};
ASSERT(!isString());
if (isInt32()) {
auto integer = asInt32();
if (static_cast<unsigned>(integer) <= 9)
return vm.smallStrings.singleCharacterString(integer + '0');
return jsNontrivialString(vm, vm.numericStrings.add(integer));
}
if (isDouble())
return jsString(vm, vm.numericStrings.add(asDouble()));
if (isTrue())
return vm.smallStrings.trueString();
if (isFalse())
return vm.smallStrings.falseString();
if (isNull())
return vm.smallStrings.nullString();
if (isUndefined())
return vm.smallStrings.undefinedString();
if (isSymbol()) {
throwTypeError(globalObject, scope, "Cannot convert a symbol to a string"_s);
return errorValue();
}
if (isBigInt()) {
JSBigInt* bigInt = asBigInt(*this);
if (auto digit = bigInt->singleDigitValueForString())
return vm.smallStrings.singleCharacterString(*digit + '0');
JSString* returnString = jsNontrivialString(vm, bigInt->toString(globalObject, 10));
RETURN_IF_EXCEPTION(scope, errorValue());
return returnString;
}
ASSERT(isCell());
JSValue value = asCell()->toPrimitive(globalObject, PreferString);
RETURN_IF_EXCEPTION(scope, errorValue());
ASSERT(!value.isObject());
JSString* result = value.toString(globalObject);
RETURN_IF_EXCEPTION(scope, errorValue());
return result;
}
String JSValue::toWTFStringSlowCase(JSGlobalObject* globalObject) const
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (isInt32())
return vm.numericStrings.add(asInt32());
if (isDouble())
return vm.numericStrings.add(asDouble());
if (isTrue())
return vm.propertyNames->trueKeyword.string();
if (isFalse())
return vm.propertyNames->falseKeyword.string();
if (isNull())
return vm.propertyNames->nullKeyword.string();
if (isUndefined())
return vm.propertyNames->undefinedKeyword.string();
JSString* string = toString(globalObject);
RETURN_IF_EXCEPTION(scope, { });
RELEASE_AND_RETURN(scope, string->value(globalObject));
}
#if !COMPILER(GCC_COMPATIBLE)
// This makes the argument opaque from the compiler.
NEVER_INLINE void ensureStillAliveHere(JSValue)
{
}
#endif
} // namespace JSC