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LibJS: Leave the unwind context on break/continue/return in bytecode

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Otherwise we'd keep the old unwind context, and end up never invoking
the other handlers up the stack.
This commit is contained in:
Ali Mohammad Pur 2022-03-13 11:51:02 +03:30 • committed by Andreas Kling
parent 41184c960d
commit ba9c4959d6
3 changed files with 44 additions and 2 deletions
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11
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -1207,10 +1207,13 @@ Bytecode::CodeGenerationErrorOr<void> ReturnStatement::generate_bytecode(Bytecod
if (m_argument)
TRY(m_argument->generate_bytecode(generator));
if (generator.is_in_generator_or_async_function())
if (generator.is_in_generator_or_async_function()) {
generator.perform_needed_unwinds<Bytecode::Op::Yield>();
generator.emit<Bytecode::Op::Yield>(nullptr);
else
} else {
generator.perform_needed_unwinds<Bytecode::Op::Return>();
generator.emit<Bytecode::Op::Return>();
}
return {};
}
@ -1279,6 +1282,7 @@ Bytecode::CodeGenerationErrorOr<void> IfStatement::generate_bytecode(Bytecode::G
Bytecode::CodeGenerationErrorOr<void> ContinueStatement::generate_bytecode(Bytecode::Generator& generator) const
{
generator.perform_needed_unwinds<Bytecode::Op::Jump>();
generator.emit<Bytecode::Op::Jump>().set_targets(
generator.nearest_continuable_scope(),
{});
@ -1438,6 +1442,7 @@ Bytecode::CodeGenerationErrorOr<void> ThrowStatement::generate_bytecode(Bytecode
Bytecode::CodeGenerationErrorOr<void> BreakStatement::generate_bytecode(Bytecode::Generator& generator) const
{
generator.perform_needed_unwinds<Bytecode::Op::Jump>(true);
generator.emit<Bytecode::Op::Jump>().set_targets(
generator.nearest_breakable_scope(),
{});
@ -1502,6 +1507,7 @@ Bytecode::CodeGenerationErrorOr<void> TryStatement::generate_bytecode(Bytecode::
auto& target_block = generator.make_block();
generator.switch_to_basic_block(saved_block);
generator.emit<Bytecode::Op::EnterUnwindContext>(Bytecode::Label { target_block }, handler_target, finalizer_target);
generator.start_boundary(Bytecode::Generator::BlockBoundaryType::Unwind);
generator.switch_to_basic_block(target_block);
TRY(m_block->generate_bytecode(generator));
@ -1514,6 +1520,7 @@ Bytecode::CodeGenerationErrorOr<void> TryStatement::generate_bytecode(Bytecode::
next_block = &block;
}
}
generator.end_boundary(Bytecode::Generator::BlockBoundaryType::Unwind);
generator.switch_to_basic_block(next_block ? *next_block : saved_block);
return {};