eadce65e04
Previously, the relational operators where casting any value to double and comparing the results according to C++ semantics. This patch makes the relational operators in JS behave according to the standard specification. Since we don't have BigInt yet, the implementation doesn't take it into account. Moved PreferredType from Object to Value. Value::to_primitive now passes preferred_type to Object::to_primitive.
298 lines
8.3 KiB
C++
298 lines
8.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Forward.h>
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#include <AK/LogStream.h>
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#include <AK/Types.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/Symbol.h>
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// 2 ** 53 - 1
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static constexpr double MAX_ARRAY_LIKE_INDEX = 9007199254740991.0;
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namespace JS {
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class Value {
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public:
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enum class Type {
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Empty,
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Undefined,
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Null,
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Number,
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String,
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Object,
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Boolean,
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Symbol,
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Accessor,
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};
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enum class PreferredType {
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Default,
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String,
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Number,
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};
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bool is_empty() const { return m_type == Type::Empty; }
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bool is_undefined() const { return m_type == Type::Undefined; }
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bool is_null() const { return m_type == Type::Null; }
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bool is_number() const { return m_type == Type::Number; }
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bool is_string() const { return m_type == Type::String; }
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bool is_object() const { return m_type == Type::Object; }
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bool is_boolean() const { return m_type == Type::Boolean; }
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bool is_symbol() const { return m_type == Type::Symbol; }
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bool is_accessor() const { return m_type == Type::Accessor; };
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bool is_cell() const { return is_string() || is_accessor() || is_object(); }
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bool is_array() const;
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bool is_function() const;
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bool is_nan() const { return is_number() && __builtin_isnan(as_double()); }
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bool is_infinity() const { return is_number() && __builtin_isinf(as_double()); }
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bool is_positive_infinity() const { return is_number() && __builtin_isinf_sign(as_double()) > 0; }
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bool is_negative_infinity() const { return is_number() && __builtin_isinf_sign(as_double()) < 0; }
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bool is_positive_zero() const { return is_number() && 1.0 / as_double() == __builtin_huge_val(); }
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bool is_negative_zero() const { return is_number() && 1.0 / as_double() == -__builtin_huge_val(); }
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bool is_integer() const { return is_finite_number() && (i32)as_double() == as_double(); }
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bool is_finite_number() const
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{
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if (!is_number())
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return false;
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auto number = as_double();
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return !__builtin_isnan(number) && !__builtin_isinf(number);
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}
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Value()
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: m_type(Type::Empty)
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{
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}
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explicit Value(bool value)
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: m_type(Type::Boolean)
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{
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m_value.as_bool = value;
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}
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explicit Value(double value)
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: m_type(Type::Number)
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{
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m_value.as_double = value;
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}
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explicit Value(unsigned value)
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: m_type(Type::Number)
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{
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m_value.as_double = static_cast<double>(value);
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}
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explicit Value(i32 value)
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: m_type(Type::Number)
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{
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m_value.as_double = value;
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}
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Value(Object* object)
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: m_type(object ? Type::Object : Type::Null)
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{
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m_value.as_object = object;
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}
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Value(PrimitiveString* string)
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: m_type(Type::String)
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{
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m_value.as_string = string;
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}
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Value(Symbol* symbol)
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: m_type(Type::Symbol)
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{
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m_value.as_symbol = symbol;
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}
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Value(Accessor* accessor)
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: m_type(Type::Accessor)
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{
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m_value.as_accessor = accessor;
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}
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explicit Value(Type type)
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: m_type(type)
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{
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}
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Type type() const { return m_type; }
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double as_double() const
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{
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ASSERT(type() == Type::Number);
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return m_value.as_double;
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}
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bool as_bool() const
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{
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ASSERT(type() == Type::Boolean);
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return m_value.as_bool;
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}
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Object& as_object()
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{
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ASSERT(type() == Type::Object);
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return *m_value.as_object;
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}
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const Object& as_object() const
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{
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ASSERT(type() == Type::Object);
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return *m_value.as_object;
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}
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PrimitiveString& as_string()
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{
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ASSERT(is_string());
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return *m_value.as_string;
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}
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const PrimitiveString& as_string() const
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{
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ASSERT(is_string());
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return *m_value.as_string;
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}
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Symbol& as_symbol()
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{
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ASSERT(is_symbol());
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return *m_value.as_symbol;
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}
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const Symbol& as_symbol() const
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{
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ASSERT(is_symbol());
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return *m_value.as_symbol;
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}
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Cell* as_cell()
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{
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ASSERT(is_cell());
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return m_value.as_cell;
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}
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String to_string_without_side_effects() const;
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Function& as_function();
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Accessor& as_accessor();
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i32 as_i32() const;
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size_t as_size_t() const;
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String to_string(Interpreter&) const;
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PrimitiveString* to_primitive_string(Interpreter&);
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Value to_primitive(Interpreter&, PreferredType preferred_type = PreferredType::Default) const;
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Object* to_object(Interpreter&) const;
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Value to_number(Interpreter&) const;
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double to_double(Interpreter&) const;
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i32 to_i32(Interpreter&) const;
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size_t to_size_t(Interpreter&) const;
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bool to_boolean() const;
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Value value_or(Value fallback) const
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{
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if (is_empty())
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return fallback;
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return *this;
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}
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private:
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Type m_type { Type::Empty };
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union {
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bool as_bool;
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double as_double;
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PrimitiveString* as_string;
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Symbol* as_symbol;
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Object* as_object;
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Cell* as_cell;
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Accessor* as_accessor;
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} m_value;
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};
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inline Value js_undefined()
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{
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return Value(Value::Type::Undefined);
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}
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inline Value js_null()
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{
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return Value(Value::Type::Null);
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}
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inline Value js_nan()
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{
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return Value(__builtin_nan(""));
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}
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inline Value js_infinity()
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{
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return Value(__builtin_huge_val());
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}
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inline Value js_negative_infinity()
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{
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return Value(-__builtin_huge_val());
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}
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Value greater_than(Interpreter&, Value lhs, Value rhs);
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Value greater_than_equals(Interpreter&, Value lhs, Value rhs);
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Value less_than(Interpreter&, Value lhs, Value rhs);
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Value less_than_equals(Interpreter&, Value lhs, Value rhs);
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Value bitwise_and(Interpreter&, Value lhs, Value rhs);
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Value bitwise_or(Interpreter&, Value lhs, Value rhs);
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Value bitwise_xor(Interpreter&, Value lhs, Value rhs);
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Value bitwise_not(Interpreter&, Value);
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Value unary_plus(Interpreter&, Value);
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Value unary_minus(Interpreter&, Value);
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Value left_shift(Interpreter&, Value lhs, Value rhs);
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Value right_shift(Interpreter&, Value lhs, Value rhs);
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Value unsigned_right_shift(Interpreter&, Value lhs, Value rhs);
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Value add(Interpreter&, Value lhs, Value rhs);
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Value sub(Interpreter&, Value lhs, Value rhs);
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Value mul(Interpreter&, Value lhs, Value rhs);
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Value div(Interpreter&, Value lhs, Value rhs);
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Value mod(Interpreter&, Value lhs, Value rhs);
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Value exp(Interpreter&, Value lhs, Value rhs);
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Value in(Interpreter&, Value lhs, Value rhs);
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Value instance_of(Interpreter&, Value lhs, Value rhs);
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bool abstract_eq(Interpreter&, Value lhs, Value rhs);
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bool strict_eq(Interpreter&, Value lhs, Value rhs);
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bool same_value(Interpreter&, Value lhs, Value rhs);
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bool same_value_zero(Interpreter&, Value lhs, Value rhs);
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bool same_value_non_numeric(Interpreter&, Value lhs, Value rhs);
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TriState abstract_relation(Interpreter& interpreter, bool left_first, Value lhs, Value rhs);
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const LogStream& operator<<(const LogStream&, const Value&);
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}
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