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LibJS: Implement async functions as generator functions in BC mode

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This applies a simple transformation, and adds a simple wrapper that
translates the generator interface to the async function interface.
This commit is contained in:
Ali Mohammad Pur 2021-11-11 00:46:07 +03:30 • committed by Linus Groh
parent c604e95993
commit 3b0bf05fa5
14 changed files with 192 additions and 43 deletions
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14
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -911,7 +911,7 @@ void ReturnStatement::generate_bytecode(Bytecode::Generator& generator) const
if (m_argument)
m_argument->generate_bytecode(generator);
if (generator.is_in_generator_function())
if (generator.is_in_generator_or_async_function())
generator.emit<Bytecode::Op::Yield>(nullptr);
else
generator.emit<Bytecode::Op::Return>();
@ -1269,4 +1269,16 @@ void ThisExpression::generate_bytecode(Bytecode::Generator& generator) const
generator.emit<Bytecode::Op::ResolveThisBinding>();
}
void AwaitExpression::generate_bytecode(Bytecode::Generator& generator) const
{
VERIFY(generator.is_in_async_function());
// Transform `await expr` to `yield expr`
m_argument->generate_bytecode(generator);
auto& continuation_block = generator.make_block();
generator.emit<Bytecode::Op::Yield>(Bytecode::Label { continuation_block });
generator.switch_to_basic_block(continuation_block);
}
}