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LibJS: Make EnterUnwindContext a terminator op

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Otherwise a basic block could have multiple outgoing edges without
having much reason to do so.
This commit is contained in:
Ali Mohammad Pur 2021-06-13 20:39:40 +04:30 committed by Ali Mohammad Pur
parent e73b142a97
commit 4c7c7c38e2
Notes: sideshowbarker 2024-07-18 12:13:16 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/4c7c7c38e2c
Pull-request: https://github.com/SerenityOS/serenity/pull/8023
Reviewed-by: https://github.com/awesomekling
3 changed files with 11 additions and 3 deletions
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5
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
View File

@ -991,8 +991,11 @@ void TryStatement::generate_bytecode(Bytecode::Generator& generator) const
}
}
auto& target_block = generator.make_block();
generator.switch_to_basic_block(saved_block);
generator.emit<Bytecode::Op::EnterUnwindContext>(handler_target, finalizer_target);
generator.emit<Bytecode::Op::EnterUnwindContext>(Bytecode::Label { target_block }, handler_target, finalizer_target);
generator.switch_to_basic_block(target_block);
m_block->generate_bytecode(generator);
if (m_finalizer && !generator.is_current_block_terminated())
generator.emit<Bytecode::Op::Jump>(finalizer_target);

3
Userland/Libraries/LibJS/Bytecode/Op.cpp
View File

@ -258,6 +258,7 @@ void Throw::execute(Bytecode::Interpreter& interpreter) const
void EnterUnwindContext::execute(Bytecode::Interpreter& interpreter) const
{
interpreter.enter_unwind_context(m_handler_target, m_finalizer_target);
interpreter.jump(m_entry_point);
}
void LeaveUnwindContext::execute(Bytecode::Interpreter& interpreter) const
@ -453,7 +454,7 @@ String EnterUnwindContext::to_string(Bytecode::Executable const&) const
{
auto handler_string = m_handler_target.has_value() ? String::formatted("{}", *m_handler_target) : "<empty>";
auto finalizer_string = m_finalizer_target.has_value() ? String::formatted("{}", *m_finalizer_target) : "<empty>";
return String::formatted("EnterUnwindContext handler:{} finalizer:{}", handler_string, finalizer_string);
return String::formatted("EnterUnwindContext handler:{} finalizer:{} entry:{}", handler_string, finalizer_string, m_entry_point);
}
String LeaveUnwindContext::to_string(Bytecode::Executable const&) const

6
Userland/Libraries/LibJS/Bytecode/Op.h
View File

@ -451,8 +451,11 @@ public:
class EnterUnwindContext final : public Instruction {
public:
EnterUnwindContext(Optional<Label> handler_target, Optional<Label> finalizer_target)
constexpr static bool IsTerminator = true;
EnterUnwindContext(Label entry_point, Optional<Label> handler_target, Optional<Label> finalizer_target)
: Instruction(Type::EnterUnwindContext)
, m_entry_point(move(entry_point))
, m_handler_target(move(handler_target))
, m_finalizer_target(move(finalizer_target))
{
@ -462,6 +465,7 @@ public:
String to_string(Bytecode::Executable const&) const;
private:
Label m_entry_point;
Optional<Label> m_handler_target;
Optional<Label> m_finalizer_target;
};