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LibJS: Implement bitwise unsigned right shift operator (>>>)

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This commit is contained in:
Linus Groh 2020-04-23 15:43:10 +01:00 • committed by Andreas Kling
parent 502d1f5165
commit 396ecfa2d7
6 changed files with 108 additions and 0 deletions
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11
Libraries/LibJS/Runtime/Value.cpp
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@ -273,6 +273,17 @@ Value right_shift(Interpreter&, Value lhs, Value rhs)
return Value((i32)lhs_number.as_double() >> (i32)rhs_number.as_double());
}
Value unsigned_right_shift(Interpreter&, Value lhs, Value rhs)
{
auto lhs_number = lhs.to_number();
if (!lhs_number.is_finite_number())
return Value(0);
auto rhs_number = rhs.to_number();
if (!rhs_number.is_finite_number())
return lhs_number;
return Value((unsigned)lhs_number.as_double() >> (i32)rhs_number.as_double());
}
Value add(Interpreter& interpreter, Value lhs, Value rhs)
{
auto lhs_primitive = lhs.to_primitive(interpreter);

7
Libraries/LibJS/Runtime/Value.h
View file

@ -82,6 +82,12 @@ public:
m_value.as_double = value;
}
explicit Value(unsigned value)
: m_type(Type::Number)
{
m_value.as_double = static_cast<double>(value);
}
explicit Value(i32 value)
: m_type(Type::Number)
{
@ -207,6 +213,7 @@ Value unary_plus(Interpreter&, Value);
Value unary_minus(Interpreter&, Value);
Value left_shift(Interpreter&, Value lhs, Value rhs);
Value right_shift(Interpreter&, Value lhs, Value rhs);
Value unsigned_right_shift(Interpreter&, Value lhs, Value rhs);
Value add(Interpreter&, Value lhs, Value rhs);
Value sub(Interpreter&, Value lhs, Value rhs);
Value mul(Interpreter&, Value lhs, Value rhs);