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ladybird/Libraries/LibJS/Runtime/Value.cpp
Andreas Kling d1b58ee9ad LibJS: Move well-known symbols to the VM 
No need to instantiate unique symbols for each Interpreter; they can
be VM-global. This reduces the memory cost and startup time anyway.
2020-09-22 20:10:20 +02:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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 <AK/FlyString.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
#include <LibCrypto/BigInt/SignedBigInteger.h>
#include <LibCrypto/NumberTheory/ModularFunctions.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Accessor.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/BigInt.h>
#include <LibJS/Runtime/BigIntObject.h>
#include <LibJS/Runtime/BooleanObject.h>
#include <LibJS/Runtime/BoundFunction.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/NumberObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/StringObject.h>
#include <LibJS/Runtime/Symbol.h>
#include <LibJS/Runtime/SymbolObject.h>
#include <LibJS/Runtime/Value.h>
#include <ctype.h>
#include <math.h>
namespace JS {
static const Crypto::SignedBigInteger BIGINT_ZERO { 0 };
static bool is_valid_bigint_value(String string)
{
string = string.trim_whitespace();
if (string.length() > 1 && (string[0] == '-' || string[0] == '+'))
string = string.substring_view(1, string.length() - 1);
for (auto& ch : string) {
if (!isdigit(ch))
return false;
}
return true;
}
ALWAYS_INLINE bool both_number(const Value& lhs, const Value& rhs)
{
return lhs.is_number() && rhs.is_number();
}
ALWAYS_INLINE bool both_bigint(const Value& lhs, const Value& rhs)
{
return lhs.is_bigint() && rhs.is_bigint();
}
bool Value::is_array() const
{
return is_object() && as_object().is_array();
}
Array& Value::as_array()
{
ASSERT(is_array());
return static_cast<Array&>(*m_value.as_object);
}
bool Value::is_function() const
{
return is_object() && as_object().is_function();
}
Function& Value::as_function()
{
ASSERT(is_function());
return static_cast<Function&>(as_object());
}
String Value::to_string_without_side_effects() const
{
switch (m_type) {
case Type::Undefined:
return "undefined";
case Type::Null:
return "null";
case Type::Boolean:
return m_value.as_bool ? "true" : "false";
case Type::Number:
if (is_nan())
return "NaN";
if (is_infinity())
return is_negative_infinity() ? "-Infinity" : "Infinity";
if (is_integer())
return String::number(as_i32());
return String::format("%.4f", m_value.as_double);
case Type::String:
return m_value.as_string->string();
case Type::Symbol:
return m_value.as_symbol->to_string();
case Type::BigInt:
return m_value.as_bigint->to_string();
case Type::Object:
return String::format("[object %s]", as_object().class_name());
case Type::Accessor:
return "<accessor>";
case Type::NativeProperty:
return "<native-property>";
default:
ASSERT_NOT_REACHED();
}
}
PrimitiveString* Value::to_primitive_string(Interpreter& interpreter)
{
if (is_string())
return &as_string();
auto string = to_string(interpreter);
if (interpreter.exception())
return nullptr;
return js_string(interpreter, string);
}
String Value::to_string(Interpreter& interpreter) const
{
switch (m_type) {
case Type::Undefined:
return "undefined";
case Type::Null:
return "null";
case Type::Boolean:
return m_value.as_bool ? "true" : "false";
case Type::Number:
if (is_nan())
return "NaN";
if (is_infinity())
return is_negative_infinity() ? "-Infinity" : "Infinity";
if (is_integer())
return String::number(as_i32());
return String::format("%.4f", m_value.as_double);
case Type::String:
return m_value.as_string->string();
case Type::Symbol:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "symbol", "string");
return {};
case Type::BigInt:
return m_value.as_bigint->big_integer().to_base10();
case Type::Object: {
auto primitive_value = as_object().to_primitive(PreferredType::String);
if (interpreter.exception())
return {};
return primitive_value.to_string(interpreter);
}
default:
ASSERT_NOT_REACHED();
}
}
bool Value::to_boolean() const
{
switch (m_type) {
case Type::Undefined:
case Type::Null:
return false;
case Type::Boolean:
return m_value.as_bool;
case Type::Number:
if (is_nan())
return false;
return m_value.as_double != 0;
case Type::String:
return !m_value.as_string->string().is_empty();
case Type::Symbol:
return true;
case Type::BigInt:
return m_value.as_bigint->big_integer() != BIGINT_ZERO;
case Type::Object:
return true;
default:
ASSERT_NOT_REACHED();
}
}
Value Value::to_primitive(Interpreter&, PreferredType preferred_type) const
{
if (is_object())
return as_object().to_primitive(preferred_type);
return *this;
}
Object* Value::to_object(Interpreter& interpreter, GlobalObject& global_object) const
{
switch (m_type) {
case Type::Undefined:
case Type::Null:
interpreter.throw_exception<TypeError>(ErrorType::ToObjectNullOrUndef);
return nullptr;
case Type::Boolean:
return BooleanObject::create(global_object, m_value.as_bool);
case Type::Number:
return NumberObject::create(global_object, m_value.as_double);
case Type::String:
return StringObject::create(global_object, *m_value.as_string);
case Type::Symbol:
return SymbolObject::create(global_object, *m_value.as_symbol);
case Type::BigInt:
return BigIntObject::create(global_object, *m_value.as_bigint);
case Type::Object:
return &const_cast<Object&>(as_object());
default:
dbg() << "Dying because I can't to_object() on " << *this;
ASSERT_NOT_REACHED();
}
}
Value Value::to_numeric(Interpreter& interpreter) const
{
auto primitive = to_primitive(interpreter, Value::PreferredType::Number);
if (interpreter.exception())
return {};
if (primitive.is_bigint())
return primitive;
return primitive.to_number(interpreter);
}
Value Value::to_number(Interpreter& interpreter) const
{
switch (m_type) {
case Type::Undefined:
return js_nan();
case Type::Null:
return Value(0);
case Type::Boolean:
return Value(m_value.as_bool ? 1 : 0);
case Type::Number:
return Value(m_value.as_double);
case Type::String: {
auto string = as_string().string().trim_whitespace();
if (string.is_empty())
return Value(0);
if (string == "Infinity" || string == "+Infinity")
return js_infinity();
if (string == "-Infinity")
return js_negative_infinity();
char* endptr;
auto parsed_double = strtod(string.characters(), &endptr);
if (*endptr)
return js_nan();
return Value(parsed_double);
}
case Type::Symbol:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "symbol", "number");
return {};
case Type::BigInt:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "BigInt", "number");
return {};
case Type::Object: {
auto primitive = m_value.as_object->to_primitive(PreferredType::Number);
if (interpreter.exception())
return {};
return primitive.to_number(interpreter);
}
default:
ASSERT_NOT_REACHED();
}
}
BigInt* Value::to_bigint(Interpreter& interpreter) const
{
auto primitive = to_primitive(interpreter, PreferredType::Number);
if (interpreter.exception())
return nullptr;
switch (primitive.type()) {
case Type::Undefined:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "undefined", "BigInt");
return nullptr;
case Type::Null:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "null", "BigInt");
return nullptr;
case Type::Boolean: {
auto value = primitive.as_bool() ? 1 : 0;
return js_bigint(interpreter, Crypto::SignedBigInteger { value });
}
case Type::BigInt:
return &primitive.as_bigint();
case Type::Number:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "number", "BigInt");
return {};
case Type::String: {
auto& string = primitive.as_string().string();
if (!is_valid_bigint_value(string)) {
interpreter.throw_exception<SyntaxError>(ErrorType::BigIntInvalidValue, string.characters());
return {};
}
return js_bigint(interpreter, Crypto::SignedBigInteger::from_base10(string.trim_whitespace()));
}
case Type::Symbol:
interpreter.throw_exception<TypeError>(ErrorType::Convert, "symbol", "BigInt");
return {};
default:
ASSERT_NOT_REACHED();
}
}
i32 Value::as_i32() const
{
return static_cast<i32>(as_double());
}
size_t Value::as_size_t() const
{
ASSERT(as_double() >= 0);
return min((double)as_i32(), MAX_ARRAY_LIKE_INDEX);
}
double Value::to_double(Interpreter& interpreter) const
{
auto number = to_number(interpreter);
if (interpreter.exception())
return 0;
return number.as_double();
}
i32 Value::to_i32(Interpreter& interpreter) const
{
auto number = to_number(interpreter);
if (interpreter.exception())
return 0;
if (number.is_nan())
return 0;
// FIXME: What about infinity though - that's UB...
// Maybe NumericLimits<i32>::max() for +Infinity and NumericLimits<i32>::min() for -Infinity?
return number.as_i32();
}
size_t Value::to_size_t(Interpreter& interpreter) const
{
if (is_empty())
return 0;
auto number = to_number(interpreter);
if (interpreter.exception())
return 0;
if (number.is_nan())
return 0;
if (number.as_double() <= 0)
return 0;
return number.as_size_t();
}
Value greater_than(Interpreter& interpreter, Value lhs, Value rhs)
{
TriState relation = abstract_relation(interpreter, false, lhs, rhs);
if (relation == TriState::Unknown)
return Value(false);
return Value(relation == TriState::True);
}
Value greater_than_equals(Interpreter& interpreter, Value lhs, Value rhs)
{
TriState relation = abstract_relation(interpreter, true, lhs, rhs);
if (relation == TriState::Unknown || relation == TriState::True)
return Value(false);
return Value(true);
}
Value less_than(Interpreter& interpreter, Value lhs, Value rhs)
{
TriState relation = abstract_relation(interpreter, true, lhs, rhs);
if (relation == TriState::Unknown)
return Value(false);
return Value(relation == TriState::True);
}
Value less_than_equals(Interpreter& interpreter, Value lhs, Value rhs)
{
TriState relation = abstract_relation(interpreter, false, lhs, rhs);
if (relation == TriState::Unknown || relation == TriState::True)
return Value(false);
return Value(true);
}
Value bitwise_and(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (!lhs_numeric.is_finite_number() || !rhs_numeric.is_finite_number())
return Value(0);
return Value((i32)lhs_numeric.as_double() & (i32)rhs_numeric.as_double());
}
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().bitwise_and(rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "bitwise AND");
return {};
}
Value bitwise_or(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (!lhs_numeric.is_finite_number() && !rhs_numeric.is_finite_number())
return Value(0);
if (!lhs_numeric.is_finite_number())
return rhs_numeric;
if (!rhs_numeric.is_finite_number())
return lhs_numeric;
return Value((i32)lhs_numeric.as_double() | (i32)rhs_numeric.as_double());
}
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().bitwise_or(rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "bitwise OR");
return {};
}
Value bitwise_xor(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (!lhs_numeric.is_finite_number() && !rhs_numeric.is_finite_number())
return Value(0);
if (!lhs_numeric.is_finite_number())
return rhs_numeric;
if (!rhs_numeric.is_finite_number())
return lhs_numeric;
return Value((i32)lhs_numeric.as_double() ^ (i32)rhs_numeric.as_double());
}
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().bitwise_xor(rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "bitwise XOR");
return {};
}
Value bitwise_not(Interpreter& interpreter, Value lhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (lhs_numeric.is_number())
return Value(~(i32)lhs_numeric.as_double());
auto big_integer_bitwise_not = lhs_numeric.as_bigint().big_integer();
big_integer_bitwise_not = big_integer_bitwise_not.plus(Crypto::SignedBigInteger { 1 });
big_integer_bitwise_not.negate();
return js_bigint(interpreter, big_integer_bitwise_not);
}
Value unary_plus(Interpreter& interpreter, Value lhs)
{
return lhs.to_number(interpreter);
}
Value unary_minus(Interpreter& interpreter, Value lhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (lhs_numeric.is_number()) {
if (lhs_numeric.is_nan())
return js_nan();
return Value(-lhs_numeric.as_double());
}
if (lhs_numeric.as_bigint().big_integer() == BIGINT_ZERO)
return js_bigint(interpreter, BIGINT_ZERO);
auto big_integer_negated = lhs_numeric.as_bigint().big_integer();
big_integer_negated.negate();
return js_bigint(interpreter, big_integer_negated);
}
Value left_shift(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (!lhs_numeric.is_finite_number())
return Value(0);
if (!rhs_numeric.is_finite_number())
return lhs_numeric;
return Value((i32)lhs_numeric.as_double() << (i32)rhs_numeric.as_double());
}
if (both_bigint(lhs_numeric, rhs_numeric))
TODO();
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "left-shift");
return {};
}
Value right_shift(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (!lhs_numeric.is_finite_number())
return Value(0);
if (!rhs_numeric.is_finite_number())
return lhs_numeric;
return Value((i32)lhs_numeric.as_double() >> (i32)rhs_numeric.as_double());
}
if (both_bigint(lhs_numeric, rhs_numeric))
TODO();
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "right-shift");
return {};
}
Value unsigned_right_shift(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (!lhs_numeric.is_finite_number())
return Value(0);
if (!rhs_numeric.is_finite_number())
return lhs_numeric;
return Value((unsigned)lhs_numeric.as_double() >> (i32)rhs_numeric.as_double());
}
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperator, "unsigned right-shift");
return {};
}
Value add(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_primitive = lhs.to_primitive(interpreter);
if (interpreter.exception())
return {};
auto rhs_primitive = rhs.to_primitive(interpreter);
if (interpreter.exception())
return {};
if (lhs_primitive.is_string() || rhs_primitive.is_string()) {
auto lhs_string = lhs_primitive.to_string(interpreter);
if (interpreter.exception())
return {};
auto rhs_string = rhs_primitive.to_string(interpreter);
if (interpreter.exception())
return {};
StringBuilder builder(lhs_string.length() + rhs_string.length());
builder.append(lhs_string);
builder.append(rhs_string);
return js_string(interpreter, builder.to_string());
}
auto lhs_numeric = lhs_primitive.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs_primitive.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric))
return Value(lhs_numeric.as_double() + rhs_numeric.as_double());
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().plus(rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "addition");
return {};
}
Value sub(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric))
return Value(lhs_numeric.as_double() - rhs_numeric.as_double());
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().minus(rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "subtraction");
return {};
}
Value mul(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric))
return Value(lhs_numeric.as_double() * rhs_numeric.as_double());
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().multiplied_by(rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "multiplication");
return {};
}
Value div(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric))
return Value(lhs_numeric.as_double() / rhs_numeric.as_double());
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().divided_by(rhs_numeric.as_bigint().big_integer()).quotient);
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "division");
return {};
}
Value mod(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (lhs_numeric.is_nan() || rhs_numeric.is_nan())
return js_nan();
auto index = lhs_numeric.as_double();
auto period = rhs_numeric.as_double();
auto trunc = (double)(i32)(index / period);
return Value(index - trunc * period);
}
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, lhs_numeric.as_bigint().big_integer().divided_by(rhs_numeric.as_bigint().big_integer()).remainder);
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "modulo");
return {};
}
Value exp(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_numeric = lhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto rhs_numeric = rhs.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric))
return Value(pow(lhs_numeric.as_double(), rhs_numeric.as_double()));
if (both_bigint(lhs_numeric, rhs_numeric))
return js_bigint(interpreter, Crypto::NumberTheory::Power(lhs_numeric.as_bigint().big_integer(), rhs_numeric.as_bigint().big_integer()));
interpreter.throw_exception<TypeError>(ErrorType::BigIntBadOperatorOtherType, "exponentiation");
return {};
}
Value in(Interpreter& interpreter, Value lhs, Value rhs)
{
if (!rhs.is_object()) {
interpreter.throw_exception<TypeError>(ErrorType::InOperatorWithObject);
return {};
}
auto lhs_string = lhs.to_string(interpreter);
if (interpreter.exception())
return {};
return Value(rhs.as_object().has_property(lhs_string));
}
Value instance_of(Interpreter& interpreter, Value lhs, Value rhs)
{
if (!rhs.is_object()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAnObject, rhs.to_string_without_side_effects().characters());
return {};
}
auto has_instance_method = rhs.as_object().get(interpreter.vm().well_known_symbol_has_instance());
if (!has_instance_method.is_empty()) {
if (!has_instance_method.is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAFunction, has_instance_method.to_string_without_side_effects().characters());
return {};
}
return Value(interpreter.call(has_instance_method.as_function(), rhs, lhs).to_boolean());
}
if (!rhs.is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAFunction, rhs.to_string_without_side_effects().characters());
return {};
}
return ordinary_has_instance(interpreter, lhs, rhs);
}
Value ordinary_has_instance(Interpreter& interpreter, Value lhs, Value rhs)
{
if (!rhs.is_function())
return Value(false);
auto& rhs_function = rhs.as_function();
if (rhs_function.is_bound_function()) {
auto& bound_target = static_cast<BoundFunction&>(rhs_function);
return instance_of(interpreter, lhs, Value(&bound_target.target_function()));
}
if (!lhs.is_object())
return Value(false);
Object* lhs_object = &lhs.as_object();
auto rhs_prototype = rhs_function.get("prototype");
if (interpreter.exception())
return {};
if (!rhs_prototype.is_object()) {
interpreter.throw_exception<TypeError>(ErrorType::InstanceOfOperatorBadPrototype, rhs_prototype.to_string_without_side_effects().characters());
return {};
}
while (true) {
lhs_object = lhs_object->prototype();
if (interpreter.exception())
return {};
if (!lhs_object)
return Value(false);
if (same_value(interpreter, rhs_prototype, lhs_object))
return Value(true);
}
}
const LogStream& operator<<(const LogStream& stream, const Value& value)
{
return stream << (value.is_empty() ? "<empty>" : value.to_string_without_side_effects());
}
bool same_value(Interpreter& interpreter, Value lhs, Value rhs)
{
if (lhs.type() != rhs.type())
return false;
if (lhs.is_number()) {
if (lhs.is_nan() && rhs.is_nan())
return true;
if (lhs.is_positive_zero() && rhs.is_negative_zero())
return false;
if (lhs.is_negative_zero() && rhs.is_positive_zero())
return false;
return lhs.as_double() == rhs.as_double();
}
if (lhs.is_bigint()) {
auto lhs_big_integer = lhs.as_bigint().big_integer();
auto rhs_big_integer = rhs.as_bigint().big_integer();
if (lhs_big_integer == BIGINT_ZERO && rhs_big_integer == BIGINT_ZERO && lhs_big_integer.is_negative() != rhs_big_integer.is_negative())
return false;
return lhs_big_integer == rhs_big_integer;
}
return same_value_non_numeric(interpreter, lhs, rhs);
}
bool same_value_zero(Interpreter& interpreter, Value lhs, Value rhs)
{
if (lhs.type() != rhs.type())
return false;
if (lhs.is_number()) {
if (lhs.is_nan() && rhs.is_nan())
return true;
return lhs.as_double() == rhs.as_double();
}
if (lhs.is_bigint())
return lhs.as_bigint().big_integer() == rhs.as_bigint().big_integer();
return same_value_non_numeric(interpreter, lhs, rhs);
}
bool same_value_non_numeric(Interpreter&, Value lhs, Value rhs)
{
ASSERT(!lhs.is_number() && !lhs.is_bigint());
ASSERT(lhs.type() == rhs.type());
switch (lhs.type()) {
case Value::Type::Undefined:
case Value::Type::Null:
return true;
case Value::Type::String:
return lhs.as_string().string() == rhs.as_string().string();
case Value::Type::Symbol:
return &lhs.as_symbol() == &rhs.as_symbol();
case Value::Type::Boolean:
return lhs.as_bool() == rhs.as_bool();
case Value::Type::Object:
return &lhs.as_object() == &rhs.as_object();
default:
ASSERT_NOT_REACHED();
}
}
bool strict_eq(Interpreter& interpreter, Value lhs, Value rhs)
{
if (lhs.type() != rhs.type())
return false;
if (lhs.is_number()) {
if (lhs.is_nan() || rhs.is_nan())
return false;
if (lhs.as_double() == rhs.as_double())
return true;
return false;
}
if (lhs.is_bigint())
return lhs.as_bigint().big_integer() == rhs.as_bigint().big_integer();
return same_value_non_numeric(interpreter, lhs, rhs);
}
bool abstract_eq(Interpreter& interpreter, Value lhs, Value rhs)
{
if (lhs.type() == rhs.type())
return strict_eq(interpreter, lhs, rhs);
if ((lhs.is_undefined() || lhs.is_null()) && (rhs.is_undefined() || rhs.is_null()))
return true;
if (lhs.is_number() && rhs.is_string())
return abstract_eq(interpreter, lhs, rhs.to_number(interpreter));
if (lhs.is_string() && rhs.is_number())
return abstract_eq(interpreter, lhs.to_number(interpreter), rhs);
if (lhs.is_bigint() && rhs.is_string()) {
auto& rhs_string = rhs.as_string().string();
if (!is_valid_bigint_value(rhs_string))
return false;
return abstract_eq(interpreter, lhs, js_bigint(interpreter, Crypto::SignedBigInteger::from_base10(rhs_string)));
}
if (lhs.is_string() && rhs.is_bigint())
return abstract_eq(interpreter, rhs, lhs);
if (lhs.is_boolean())
return abstract_eq(interpreter, lhs.to_number(interpreter), rhs);
if (rhs.is_boolean())
return abstract_eq(interpreter, lhs, rhs.to_number(interpreter));
if ((lhs.is_string() || lhs.is_number() || lhs.is_bigint() || lhs.is_symbol()) && rhs.is_object())
return abstract_eq(interpreter, lhs, rhs.to_primitive(interpreter));
if (lhs.is_object() && (rhs.is_string() || rhs.is_number() || lhs.is_bigint() || rhs.is_symbol()))
return abstract_eq(interpreter, lhs.to_primitive(interpreter), rhs);
if ((lhs.is_bigint() && rhs.is_number()) || (lhs.is_number() && rhs.is_bigint())) {
if (lhs.is_nan() || lhs.is_infinity() || rhs.is_nan() || rhs.is_infinity())
return false;
if ((lhs.is_number() && !lhs.is_integer()) || (rhs.is_number() && !rhs.is_integer()))
return false;
if (lhs.is_number())
return Crypto::SignedBigInteger { lhs.as_i32() } == rhs.as_bigint().big_integer();
else
return Crypto::SignedBigInteger { rhs.as_i32() } == lhs.as_bigint().big_integer();
}
return false;
}
TriState abstract_relation(Interpreter& interpreter, bool left_first, Value lhs, Value rhs)
{
Value x_primitive;
Value y_primitive;
if (left_first) {
x_primitive = lhs.to_primitive(interpreter, Value::PreferredType::Number);
if (interpreter.exception())
return {};
y_primitive = rhs.to_primitive(interpreter, Value::PreferredType::Number);
if (interpreter.exception())
return {};
} else {
y_primitive = lhs.to_primitive(interpreter, Value::PreferredType::Number);
if (interpreter.exception())
return {};
x_primitive = rhs.to_primitive(interpreter, Value::PreferredType::Number);
if (interpreter.exception())
return {};
}
if (x_primitive.is_string() && y_primitive.is_string()) {
auto x_string = x_primitive.as_string().string();
auto y_string = y_primitive.as_string().string();
if (x_string.starts_with(y_string))
return TriState::False;
if (y_string.starts_with(x_string))
return TriState::True;
Utf8View x_code_points { x_string };
Utf8View y_code_points { y_string };
for (auto k = x_code_points.begin(), l = y_code_points.begin();
k != x_code_points.end() && l != y_code_points.end();
++k, ++l) {
if (*k != *l) {
if (*k < *l) {
return TriState::True;
} else {
return TriState::False;
}
}
}
ASSERT_NOT_REACHED();
}
if (x_primitive.is_bigint() && y_primitive.is_string()) {
auto& y_string = y_primitive.as_string().string();
if (!is_valid_bigint_value(y_string))
return TriState::Unknown;
if (x_primitive.as_bigint().big_integer() < Crypto::SignedBigInteger::from_base10(y_string))
return TriState::True;
else
return TriState::False;
}
if (x_primitive.is_string() && y_primitive.is_bigint()) {
auto& x_string = x_primitive.as_string().string();
if (!is_valid_bigint_value(x_string))
return TriState::Unknown;
if (Crypto::SignedBigInteger::from_base10(x_string) < y_primitive.as_bigint().big_integer())
return TriState::True;
else
return TriState::False;
}
auto x_numeric = x_primitive.to_numeric(interpreter);
if (interpreter.exception())
return {};
auto y_numeric = y_primitive.to_numeric(interpreter);
if (interpreter.exception())
return {};
if (x_numeric.is_nan() || y_numeric.is_nan())
return TriState::Unknown;
if (x_numeric.is_positive_infinity() || y_numeric.is_negative_infinity())
return TriState::False;
if (x_numeric.is_negative_infinity() || y_numeric.is_positive_infinity())
return TriState::True;
if (x_numeric.is_number() && y_numeric.is_number()) {
if (x_numeric.as_double() < y_numeric.as_double())
return TriState::True;
else
return TriState::False;
}
if (x_numeric.is_bigint() && y_numeric.is_bigint()) {
if (x_numeric.as_bigint().big_integer() < y_numeric.as_bigint().big_integer())
return TriState::True;
else
return TriState::False;
}
ASSERT((x_numeric.is_number() && y_numeric.is_bigint()) || (x_numeric.is_bigint() && y_numeric.is_number()));
bool x_lower_than_y;
if (x_numeric.is_number()) {
x_lower_than_y = x_numeric.is_integer()
? Crypto::SignedBigInteger { x_numeric.as_i32() } < y_numeric.as_bigint().big_integer()
: (Crypto::SignedBigInteger { x_numeric.as_i32() } < y_numeric.as_bigint().big_integer() || Crypto::SignedBigInteger { x_numeric.as_i32() + 1 } < y_numeric.as_bigint().big_integer());
} else {
x_lower_than_y = y_numeric.is_integer()
? x_numeric.as_bigint().big_integer() < Crypto::SignedBigInteger { y_numeric.as_i32() }
: (x_numeric.as_bigint().big_integer() < Crypto::SignedBigInteger { y_numeric.as_i32() } || x_numeric.as_bigint().big_integer() < Crypto::SignedBigInteger { y_numeric.as_i32() + 1 });
}
if (x_lower_than_y)
return TriState::True;
else
return TriState::False;
}
size_t length_of_array_like(Interpreter& interpreter, Value value)
{
ASSERT(value.is_object());
auto result = value.as_object().get("length");
if (interpreter.exception())
return 0;
return result.to_size_t(interpreter);
}
}
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