--- /dev/null
+/*
+ * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ * Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ * Copyright (C) 2003, 2007, 2008, 2012 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 "Error.h"
+#include "ExceptionHelpers.h"
+#include "GetterSetter.h"
+#include "JSCJSValueInlines.h"
+#include "JSFunction.h"
+#include "JSGlobalObject.h"
+#include "JSNotAnObject.h"
+#include "NumberObject.h"
+#include <wtf/MathExtras.h>
+#include <wtf/StringExtras.h>
+
+namespace JSC {
+
+static const double D32 = 4294967296.0;
+
+// ECMA 9.4
+double JSValue::toInteger(ExecState* exec) const
+{
+ if (isInt32())
+ return asInt32();
+ double d = toNumber(exec);
+ return std::isnan(d) ? 0.0 : trunc(d);
+}
+
+double JSValue::toIntegerPreserveNaN(ExecState* exec) const
+{
+ if (isInt32())
+ return asInt32();
+ return trunc(toNumber(exec));
+}
+
+double JSValue::toNumberSlowCase(ExecState* exec) const
+{
+ ASSERT(!isInt32() && !isDouble());
+ if (isCell())
+ return asCell()->toNumber(exec);
+ if (isTrue())
+ return 1.0;
+ return isUndefined() ? QNaN : 0; // null and false both convert to 0.
+}
+
+JSObject* JSValue::toObjectSlowCase(ExecState* exec, JSGlobalObject* globalObject) const
+{
+ ASSERT(!isCell());
+
+ if (isInt32() || isDouble())
+ return constructNumber(exec, globalObject, asValue());
+ if (isTrue() || isFalse())
+ return constructBooleanFromImmediateBoolean(exec, globalObject, asValue());
+
+ ASSERT(isUndefinedOrNull());
+ throwError(exec, createNotAnObjectError(exec, *this));
+ return JSNotAnObject::create(exec);
+}
+
+JSObject* JSValue::toThisObjectSlowCase(ExecState* exec) const
+{
+ ASSERT(!isCell());
+
+ if (isInt32() || isDouble())
+ return constructNumber(exec, exec->lexicalGlobalObject(), asValue());
+ if (isTrue() || isFalse())
+ return constructBooleanFromImmediateBoolean(exec, exec->lexicalGlobalObject(), asValue());
+ ASSERT(isUndefinedOrNull());
+ return exec->globalThisValue();
+}
+
+JSObject* JSValue::synthesizePrototype(ExecState* exec) const
+{
+ if (isCell()) {
+ ASSERT(isString());
+ return exec->lexicalGlobalObject()->stringPrototype();
+ }
+
+ if (isNumber())
+ return exec->lexicalGlobalObject()->numberPrototype();
+ if (isBoolean())
+ return exec->lexicalGlobalObject()->booleanPrototype();
+
+ ASSERT(isUndefinedOrNull());
+ throwError(exec, createNotAnObjectError(exec, *this));
+ return JSNotAnObject::create(exec);
+}
+
+// ECMA 8.7.2
+void JSValue::putToPrimitive(ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
+{
+ VM& vm = exec->vm();
+
+ unsigned index = propertyName.asIndex();
+ if (index != PropertyName::NotAnIndex) {
+ putToPrimitiveByIndex(exec, index, value, slot.isStrictMode());
+ return;
+ }
+
+ // Check if there are any setters or getters in the prototype chain
+ JSObject* obj = synthesizePrototype(exec);
+ JSValue prototype;
+ if (propertyName != exec->propertyNames().underscoreProto) {
+ for (; !obj->structure()->hasReadOnlyOrGetterSetterPropertiesExcludingProto(); obj = asObject(prototype)) {
+ prototype = obj->prototype();
+ if (prototype.isNull()) {
+ if (slot.isStrictMode())
+ throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+ return;
+ }
+ }
+ }
+
+ for (; ; obj = asObject(prototype)) {
+ unsigned attributes;
+ JSCell* specificValue;
+ PropertyOffset offset = obj->structure()->get(vm, propertyName, attributes, specificValue);
+ if (offset != invalidOffset) {
+ if (attributes & ReadOnly) {
+ if (slot.isStrictMode())
+ throwError(exec, createTypeError(exec, StrictModeReadonlyPropertyWriteError));
+ return;
+ }
+
+ JSValue gs = obj->getDirect(offset);
+ if (gs.isGetterSetter()) {
+ JSObject* setterFunc = asGetterSetter(gs)->setter();
+ if (!setterFunc) {
+ if (slot.isStrictMode())
+ throwError(exec, createTypeError(exec, ASCIILiteral("setting a property that has only a getter")));
+ return;
+ }
+
+ CallData callData;
+ CallType callType = setterFunc->methodTable()->getCallData(setterFunc, callData);
+ MarkedArgumentBuffer args;
+ args.append(value);
+
+ // If this is WebCore's global object then we need to substitute the shell.
+ call(exec, setterFunc, callType, callData, *this, args);
+ return;
+ }
+
+ // If there's an existing property on the object or one of its
+ // prototypes it should be replaced, so break here.
+ break;
+ }
+
+ prototype = obj->prototype();
+ if (prototype.isNull())
+ break;
+ }
+
+ if (slot.isStrictMode())
+ throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+ return;
+}
+
+void JSValue::putToPrimitiveByIndex(ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
+{
+ if (propertyName > MAX_ARRAY_INDEX) {
+ PutPropertySlot slot(shouldThrow);
+ putToPrimitive(exec, Identifier::from(exec, propertyName), value, slot);
+ return;
+ }
+
+ if (synthesizePrototype(exec)->attemptToInterceptPutByIndexOnHoleForPrototype(exec, *this, propertyName, value, shouldThrow))
+ return;
+
+ if (shouldThrow)
+ throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+}
+
+void JSValue::dump(PrintStream& out) 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 (asCell()->inherits(&JSString::s_info)) {
+ JSString* string = jsCast<JSString*>(asCell());
+ out.print("String: ");
+ if (string->isRope())
+ out.print("(rope) ");
+ out.print(string->tryGetValue());
+ } else if (asCell()->inherits(&Structure::s_info)) {
+ Structure* structure = jsCast<Structure*>(asCell());
+ out.print(
+ "Structure: ", RawPointer(structure), ": ", structure->classInfo()->className,
+ ", ", IndexingTypeDump(structure->indexingTypeIncludingHistory()));
+ } else {
+ out.print("Cell: ", RawPointer(asCell()));
+ if (isObject() && asObject(*this)->butterfly())
+ out.print("->", RawPointer(asObject(*this)->butterfly()));
+ out.print(
+ " (", RawPointer(asCell()->structure()), ": ", asCell()->structure()->classInfo()->className,
+ ", ", IndexingTypeDump(asCell()->structure()->indexingTypeIncludingHistory()), ")");
+ }
+ } 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");
+}
+
+// This in the ToInt32 operation is defined in section 9.5 of the ECMA-262 spec.
+// Note that this operation is identical to ToUInt32 other than to interpretation
+// of the resulting bit-pattern (as such this metod is also called to implement
+// ToUInt32).
+//
+// The operation can be descibed as round towards zero, then select the 32 least
+// bits of the resulting value in 2s-complement representation.
+int32_t toInt32(double number)
+{
+ int64_t bits = WTF::bitwise_cast<int64_t>(number);
+ int32_t exp = (static_cast<int32_t>(bits >> 52) & 0x7ff) - 0x3ff;
+
+ // If exponent < 0 there will be no bits to the left of the decimal point
+ // after rounding; if the exponent is > 83 then no bits of precision can be
+ // left in the low 32-bit range of the result (IEEE-754 doubles have 52 bits
+ // of fractional precision).
+ // Note this case handles 0, -0, and all infinte, NaN, & denormal value.
+ if (exp < 0 || exp > 83)
+ return 0;
+
+ // Select the appropriate 32-bits from the floating point mantissa. If the
+ // exponent is 52 then the bits we need to select are already aligned to the
+ // lowest bits of the 64-bit integer representation of tghe number, no need
+ // to shift. If the exponent is greater than 52 we need to shift the value
+ // left by (exp - 52), if the value is less than 52 we need to shift right
+ // accordingly.
+ int32_t result = (exp > 52)
+ ? static_cast<int32_t>(bits << (exp - 52))
+ : static_cast<int32_t>(bits >> (52 - exp));
+
+ // IEEE-754 double precision values are stored omitting an implicit 1 before
+ // the decimal point; we need to reinsert this now. We may also the shifted
+ // invalid bits into the result that are not a part of the mantissa (the sign
+ // and exponent bits from the floatingpoint representation); mask these out.
+ if (exp < 32) {
+ int32_t missingOne = 1 << exp;
+ result &= missingOne - 1;
+ result += missingOne;
+ }
+
+ // If the input value was negative (we could test either 'number' or 'bits',
+ // but testing 'bits' is likely faster) invert the result appropriately.
+ return bits < 0 ? -result : result;
+}
+
+bool JSValue::isValidCallee()
+{
+ return asObject(asCell())->globalObject();
+}
+
+JSString* JSValue::toStringSlowCase(ExecState* exec) const
+{
+ VM& vm = exec->vm();
+ ASSERT(!isString());
+ if (isInt32())
+ return jsString(&vm, vm.numericStrings.add(asInt32()));
+ 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();
+
+ ASSERT(isCell());
+ JSValue value = asCell()->toPrimitive(exec, PreferString);
+ if (exec->hadException())
+ return jsEmptyString(exec);
+ ASSERT(!value.isObject());
+ return value.toString(exec);
+}
+
+String JSValue::toWTFStringSlowCase(ExecState* exec) const
+{
+ return inlineJSValueNotStringtoString(*this, exec);
+}
+
+} // namespace JSC
projects / apple / javascriptcore.git / blobdiff