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LibJS: Pass Interpreter& to Value::to_number() et al.

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This patch is unfortunately rather large and might make some things feel
bloated, but it is necessary to fix a few flaws in LibJS, primarily
blindly coercing values to numbers without exception checks - i.e.

interpreter.argument(0).to_i32();  // can fail!!!

Some examples where the interpreter would actually crash:

var o = { toString: () => { throw Error() } };
+o;
o - 1;
"foo".charAt(o);
"bar".repeat(o);

To fix this, we now have the following...

to_double(Interpreter&)
to_i32()
to_i32(Interpreter&)
to_size_t()
to_size_t(Interpreter&)

...and a whole lot of exception checking.

There's intentionally no to_double(), use as_double() directly instead.

This way we still can use these convenient utility functions but don't
need to check for exceptions if we are sure the value already is a
number.

Fixes #2267.
This commit is contained in:
Linus Groh 2020-05-18 00:28:00 +01:00 • committed by Andreas Kling
parent 1a1394f7a2
commit 476094922b
17 changed files with 491 additions and 187 deletions
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11
Libraries/LibJS/Runtime/ReflectObject.cpp
View file

@ -64,7 +64,9 @@ static void prepare_arguments_list(Interpreter& interpreter, Value value, Marked
auto length_property = arguments_list.get("length");
if (interpreter.exception())
return;
auto length = length_property.to_size_t();
auto length = length_property.to_size_t(interpreter);
if (interpreter.exception())
return;
for (size_t i = 0; i < length; ++i) {
auto element = arguments_list.get(String::number(i));
if (interpreter.exception())
@ -156,8 +158,11 @@ Value ReflectObject::delete_property(Interpreter& interpreter)
auto property_name = PropertyName(property_key.to_string(interpreter));
if (interpreter.exception())
return {};
if (property_key.to_number().is_finite_number()) {
auto property_key_as_double = property_key.to_double();
auto property_key_number = property_key.to_number(interpreter);
if (interpreter.exception())
return {};
if (property_key_number.is_finite_number()) {
auto property_key_as_double = property_key_number.as_double();
if (property_key_as_double >= 0 && (i32)property_key_as_double == property_key_as_double)
property_name = PropertyName(property_key_as_double);
}