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LibJS+Everywhere: Make PrimitiveString and Utf16String fallible

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This makes construction of Utf16String fallible in OOM conditions. The
immediate impact is that PrimitiveString must then be fallible as well,
as it may either transcode UTF-8 to UTF-16, or create a UTF-16 string
from ropes.

There are a couple of places where it is very non-trivial to propagate
the error further. A FIXME has been added to those locations.
This commit is contained in:
Timothy Flynn 2023-01-07 12:24:05 -05:00 • committed by Linus Groh
parent d793262beb
commit 115baa7e32
57 changed files with 306 additions and 295 deletions
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42
Userland/Libraries/LibJS/Runtime/RegExpLegacyStaticProperties.cpp
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@ -68,7 +68,7 @@ ThrowCompletionOr<void> set_legacy_regexp_static_property(VM& vm, RegExpConstruc
}
// UpdateLegacyRegExpStaticProperties ( C, S, startIndex, endIndex, capturedValues ), https://github.com/tc39/proposal-regexp-legacy-features#updatelegacyregexpstaticproperties--c-s-startindex-endindex-capturedvalues-
void update_legacy_regexp_static_properties(RegExpConstructor& constructor, Utf16String const& string, size_t start_index, size_t end_index, Vector<Utf16String> const& captured_values)
ThrowCompletionOr<void> update_legacy_regexp_static_properties(VM& vm, RegExpConstructor& constructor, Utf16String const& string, size_t start_index, size_t end_index, Vector<Utf16String> const& captured_values)
{
auto& legacy_static_properties = constructor.legacy_static_properties();
@ -92,7 +92,7 @@ void update_legacy_regexp_static_properties(RegExpConstructor& constructor, Utf1
// 8. Set the value of C’s [[RegExpLastMatch]] internal slot to a String whose length is endIndex - startIndex and containing the code units from S with indices startIndex through endIndex - 1, in ascending order.
auto last_match = string.view().substring_view(start_index, end_index - start_index);
legacy_static_properties.set_last_match(Utf16String(last_match));
legacy_static_properties.set_last_match(TRY(Utf16String::create(vm, last_match)));
// 9. If n > 0, set the value of C’s [[RegExpLastParen]] internal slot to the last element of capturedValues.
if (group_count > 0) {
@ -101,49 +101,45 @@ void update_legacy_regexp_static_properties(RegExpConstructor& constructor, Utf1
}
// 10. Else, set the value of C’s [[RegExpLastParen]] internal slot to the empty String.
else {
legacy_static_properties.set_last_paren(Utf16String(""sv));
legacy_static_properties.set_last_paren(TRY(Utf16String::create(vm)));
}
// 11. Set the value of C’s [[RegExpLeftContext]] internal slot to a String whose length is startIndex and containing the code units from S with indices 0 through startIndex - 1, in ascending order.
auto left_context = string.view().substring_view(0, start_index);
legacy_static_properties.set_left_context(Utf16String(left_context));
legacy_static_properties.set_left_context(TRY(Utf16String::create(vm, left_context)));
// 12. Set the value of C’s [[RegExpRightContext]] internal slot to a String whose length is len - endIndex and containing the code units from S with indices endIndex through len - 1, in ascending order.
auto right_context = string.view().substring_view(end_index, len - end_index);
legacy_static_properties.set_right_context(Utf16String(right_context));
legacy_static_properties.set_right_context(TRY(Utf16String::create(vm, right_context)));
// 13. For each integer i such that 1 ≤ i ≤ 9
for (size_t i = 1; i <= 9; i++) {
auto value = Utf16String(""sv);
// If i ≤ n, set the value of C’s [[RegExpPareni]] internal slot to the ith element of capturedValues.
if (i <= group_count) {
value = captured_values[i - 1];
}
// Else, set the value of C’s [[RegExpPareni]] internal slot to the empty String.
else {
// It's already an empty string
}
// i. If i ≤ n, set the value of C’s [[RegExpPareni]] internal slot to the ith element of capturedValues.
// ii. Else, set the value of C’s [[RegExpPareni]] internal slot to the empty String.
auto value = (i <= group_count) ? captured_values[i - 1] : TRY(Utf16String::create(vm));
if (i == 1) {
legacy_static_properties.set_$1(Utf16String(value));
legacy_static_properties.set_$1(move(value));
} else if (i == 2) {
legacy_static_properties.set_$2(Utf16String(value));
legacy_static_properties.set_$2(move(value));
} else if (i == 3) {
legacy_static_properties.set_$3(Utf16String(value));
legacy_static_properties.set_$3(move(value));
} else if (i == 4) {
legacy_static_properties.set_$4(Utf16String(value));
legacy_static_properties.set_$4(move(value));
} else if (i == 5) {
legacy_static_properties.set_$5(Utf16String(value));
legacy_static_properties.set_$5(move(value));
} else if (i == 6) {
legacy_static_properties.set_$6(Utf16String(value));
legacy_static_properties.set_$6(move(value));
} else if (i == 7) {
legacy_static_properties.set_$7(Utf16String(value));
legacy_static_properties.set_$7(move(value));
} else if (i == 8) {
legacy_static_properties.set_$8(Utf16String(value));
legacy_static_properties.set_$8(move(value));
} else if (i == 9) {
legacy_static_properties.set_$9(Utf16String(value));
legacy_static_properties.set_$9(move(value));
}
}
return {};
}
// InvalidateLegacyRegExpStaticProperties ( C ), https://github.com/tc39/proposal-regexp-legacy-features#invalidatelegacyregexpstaticproperties--c