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LibJS: Use correct this value for tagged template literals with members

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Required by creepjs, which does Date().split` `[3] to get the current
year.
This commit is contained in:
Luke Wilde 2025-01-16 17:18:19 +00:00 • committed by Andreas Kling
parent 5f33383a7b
commit a588756105
Notes: github-actions[bot] 2025-01-17 16:16:08 +00:00
2 changed files with 119 additions and 3 deletions
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18
Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -2469,10 +2469,24 @@ Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> TemplateLiteral::genera
return dst;
}
struct TagAndThisValue {
ScopedOperand tag;
ScopedOperand this_value;
};
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> TaggedTemplateLiteral::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
{
Bytecode::Generator::SourceLocationScope scope(generator, *this);
auto tag = TRY(m_tag->generate_bytecode(generator)).value();
auto [tag, this_value] = TRY([&]() -> CodeGenerationErrorOr<TagAndThisValue> {
if (is<MemberExpression>(*m_tag)) {
auto& member_expression = static_cast<MemberExpression const&>(*m_tag);
auto base_and_value = TRY(get_base_and_value_from_member_expression(generator, member_expression));
return TagAndThisValue { .tag = base_and_value.value, .this_value = base_and_value.base };
}
auto tag = TRY(m_tag->generate_bytecode(generator)).value();
return TagAndThisValue { .tag = tag, .this_value = generator.add_constant(js_undefined()) };
}());
// FIXME: Follow
// 13.2.8.3 GetTemplateObject ( templateLiteral ), https://tc39.es/ecma262/#sec-gettemplateobject
@ -2539,7 +2553,7 @@ Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> TaggedTemplateLiteral::
generator.emit<Bytecode::Op::NewArray>(arguments);
auto dst = choose_dst(generator, preferred_dst);
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, dst, tag, generator.add_constant(js_undefined()), arguments);
generator.emit<Bytecode::Op::CallWithArgumentArray>(Bytecode::Op::CallType::Call, dst, tag, this_value, arguments);
return dst;
}