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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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25
Userland/Libraries/LibJS/Runtime/PrimitiveString.h
View file

@ -8,9 +8,11 @@
#pragma once
#include <AK/DeprecatedString.h>
#include <AK/Optional.h>
#include <AK/StringView.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/Cell.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/Utf16String.h>
#include <LibJS/Runtime/Value.h>
@ -20,7 +22,6 @@ class PrimitiveString final : public Cell {
JS_CELL(PrimitiveString, Cell);
public:
[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, Utf16View const&);
[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, Utf16String);
[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, DeprecatedString);
[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, PrimitiveString&, PrimitiveString&);
@ -31,15 +32,16 @@ public:
PrimitiveString& operator=(PrimitiveString const&) = delete;
bool is_empty() const;
u32 hash() const;
DeprecatedString const& deprecated_string() const;
bool has_utf8_string() const { return m_has_utf8_string; }
ThrowCompletionOr<DeprecatedString const&> deprecated_string() const;
bool has_utf8_string() const { return m_utf8_string.has_value(); }
Utf16String const& utf16_string() const;
Utf16View utf16_string_view() const;
bool has_utf16_string() const { return m_has_utf16_string; }
ThrowCompletionOr<Utf16String const&> utf16_string() const;
ThrowCompletionOr<Utf16View> utf16_string_view() const;
bool has_utf16_string() const { return m_utf16_string.has_value(); }
Optional<Value> get(VM&, PropertyKey const&) const;
ThrowCompletionOr<Optional<Value>> get(VM&, PropertyKey const&) const;
private:
explicit PrimitiveString(PrimitiveString&, PrimitiveString&);
@ -48,18 +50,15 @@ private:
virtual void visit_edges(Cell::Visitor&) override;
void resolve_rope_if_needed() const;
ThrowCompletionOr<void> resolve_rope_if_needed() const;
mutable bool m_is_rope { false };
mutable bool m_has_utf8_string { false };
mutable bool m_has_utf16_string { false };
mutable PrimitiveString* m_lhs { nullptr };
mutable PrimitiveString* m_rhs { nullptr };
mutable DeprecatedString m_utf8_string;
mutable Utf16String m_utf16_string;
mutable Optional<DeprecatedString> m_utf8_string;
mutable Optional<Utf16String> m_utf16_string;
};
}