| /* |
| * Copyright (C) 1999-2001 Harri Porten (porten@kde.org) |
| * Copyright (C) 2001 Peter Kelly (pmk@post.com) |
| * Copyright (C) 2003-2017 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(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::toLength(ExecState* exec) const |
| { |
| // ECMA 7.1.15 |
| // http://www.ecma-international.org/ecma-262/6.0/#sec-tolength |
| double d = toInteger(exec); |
| if (d <= 0) |
| return 0.0; |
| if (std::isinf(d)) |
| return maxSafeInteger(); |
| return std::min(d, maxSafeInteger()); |
| } |
| |
| double JSValue::toNumberSlowCase(ExecState* exec) const |
| { |
| ASSERT(!isInt32() && !isDouble()); |
| if (isCell()) |
| return asCell()->toNumber(exec); |
| if (isTrue()) |
| return 1.0; |
| return isUndefined() ? PNaN : 0; // null and false both convert to 0. |
| } |
| |
| std::optional<double> JSValue::toNumberFromPrimitive() const |
| { |
| if (isEmpty()) |
| return std::nullopt; |
| if (isNumber()) |
| return asNumber(); |
| if (isBoolean()) |
| return asBoolean(); |
| if (isUndefined()) |
| return PNaN; |
| if (isNull()) |
| return 0; |
| return std::nullopt; |
| } |
| |
| JSObject* JSValue::toObjectSlowCase(ExecState* exec, JSGlobalObject* globalObject) const |
| { |
| VM& vm = exec->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| ASSERT(!isCell()); |
| |
| if (isInt32() || isDouble()) |
| return constructNumber(exec, globalObject, asValue()); |
| if (isTrue() || isFalse()) |
| return constructBooleanFromImmediateBoolean(exec, globalObject, asValue()); |
| |
| ASSERT(isUndefinedOrNull()); |
| throwException(exec, scope, createNotAnObjectError(exec, *this)); |
| return nullptr; |
| } |
| |
| JSValue JSValue::toThisSlowCase(ExecState* exec, ECMAMode ecmaMode) const |
| { |
| ASSERT(!isCell()); |
| |
| if (ecmaMode == StrictMode) |
| return *this; |
| |
| 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 |
| { |
| VM& vm = exec->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| if (isCell()) { |
| if (isString()) |
| return exec->lexicalGlobalObject()->stringPrototype(); |
| if (isBigInt()) |
| return exec->lexicalGlobalObject()->bigIntPrototype(); |
| ASSERT(isSymbol()); |
| return exec->lexicalGlobalObject()->symbolPrototype(); |
| } |
| |
| if (isNumber()) |
| return exec->lexicalGlobalObject()->numberPrototype(); |
| if (isBoolean()) |
| return exec->lexicalGlobalObject()->booleanPrototype(); |
| |
| ASSERT(isUndefinedOrNull()); |
| throwException(exec, scope, createNotAnObjectError(exec, *this)); |
| return nullptr; |
| } |
| |
| // ECMA 8.7.2 |
| bool JSValue::putToPrimitive(ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot) |
| { |
| VM& vm = exec->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| if (std::optional<uint32_t> index = parseIndex(propertyName)) { |
| scope.release(); |
| return putToPrimitiveByIndex(exec, index.value(), value, slot.isStrictMode()); |
| } |
| |
| // Check if there are any setters or getters in the prototype chain |
| JSObject* obj = synthesizePrototype(exec); |
| EXCEPTION_ASSERT(!!scope.exception() == !obj); |
| if (UNLIKELY(!obj)) |
| return false; |
| JSValue prototype; |
| if (propertyName != vm.propertyNames->underscoreProto) { |
| for (; !obj->structure(vm)->hasReadOnlyOrGetterSetterPropertiesExcludingProto(); obj = asObject(prototype)) { |
| prototype = obj->getPrototype(vm, exec); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (prototype.isNull()) |
| return typeError(exec, scope, slot.isStrictMode(), ReadonlyPropertyWriteError); |
| } |
| } |
| |
| for (; ; obj = asObject(prototype)) { |
| unsigned attributes; |
| PropertyOffset offset = obj->structure(vm)->get(vm, propertyName, attributes); |
| if (offset != invalidOffset) { |
| if (attributes & PropertyAttribute::ReadOnly) |
| return typeError(exec, scope, slot.isStrictMode(), ReadonlyPropertyWriteError); |
| |
| JSValue gs = obj->getDirect(offset); |
| if (gs.isGetterSetter()) { |
| scope.release(); |
| return callSetter(exec, *this, gs, value, slot.isStrictMode() ? StrictMode : NotStrictMode); |
| } |
| |
| if (gs.isCustomGetterSetter()) |
| return callCustomSetter(exec, 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, exec); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (prototype.isNull()) |
| break; |
| } |
| |
| return typeError(exec, scope, slot.isStrictMode(), ReadonlyPropertyWriteError); |
| } |
| |
| bool JSValue::putToPrimitiveByIndex(ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow) |
| { |
| VM& vm = exec->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| if (propertyName > MAX_ARRAY_INDEX) { |
| PutPropertySlot slot(*this, shouldThrow); |
| return putToPrimitive(exec, Identifier::from(exec, propertyName), value, slot); |
| } |
| |
| JSObject* prototype = synthesizePrototype(exec); |
| EXCEPTION_ASSERT(!!scope.exception() == !prototype); |
| if (UNLIKELY(!prototype)) |
| return false; |
| bool putResult = false; |
| bool success = prototype->attemptToInterceptPutByIndexOnHoleForPrototype(exec, *this, propertyName, value, shouldThrow, putResult); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (success) |
| return putResult; |
| |
| return typeError(exec, 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->isAtomic()) |
| out.print(" (atomic)"); |
| if (impl->isAtomic()) |
| out.print(" (identifier)"); |
| if (impl->isSymbol()) |
| out.print(" (symbol)"); |
| } else |
| out.print(" (unresolved)"); |
| 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(ExecState* exec, bool returnEmptyStringOnError) const |
| { |
| VM& vm = exec->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| auto errorValue = [&] () -> JSString* { |
| if (returnEmptyStringOnError) |
| return jsEmptyString(exec); |
| 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(exec, 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(exec, 10)); |
| RETURN_IF_EXCEPTION(scope, errorValue()); |
| return returnString; |
| } |
| |
| ASSERT(isCell()); |
| JSValue value = asCell()->toPrimitive(exec, PreferString); |
| RETURN_IF_EXCEPTION(scope, errorValue()); |
| ASSERT(!value.isObject()); |
| JSString* result = value.toString(exec); |
| RETURN_IF_EXCEPTION(scope, errorValue()); |
| return result; |
| } |
| |
| String JSValue::toWTFStringSlowCase(ExecState* exec) const |
| { |
| VM& vm = exec->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(); |
| return toString(exec)->value(exec); |
| } |
| |
| } // namespace JSC |
