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LibJS: Actually leave the current function scope on "return"

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We now unwind until the nearest function-level scope on the scope stack
when executing a return statement.
This commit is contained in:
Andreas Kling 2020-03-23 19:19:03 +01:00
parent df524203b2
commit 494df52961
Notes: sideshowbarker 2024-07-19 08:10:08 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/494df529613
3 changed files with 13 additions and 6 deletions
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2
Libraries/LibJS/AST.cpp
View file

@ -81,7 +81,7 @@ Value CallExpression::execute(Interpreter& interpreter) const
Value ReturnStatement::execute(Interpreter& interpreter) const
{
auto value = argument() ? argument()->execute(interpreter) : js_undefined();
interpreter.do_return();
interpreter.unwind(ScopeType::Function);
return value;
}

12
Libraries/LibJS/Interpreter.cpp
View file

@ -61,8 +61,13 @@ Value Interpreter::run(const Statement& statement, Vector<Argument> arguments, S
Value last_value = js_undefined();
for (auto& node : block.children()) {
last_value = node.execute(*this);
if (m_unwind_until != ScopeType::None)
break;
}
if (m_unwind_until == scope_type)
m_unwind_until = ScopeType::None;
exit_scope(block);
return last_value;
}
@ -80,11 +85,10 @@ void Interpreter::exit_scope(const ScopeNode& scope_node)
{
while (m_scope_stack.last().scope_node.ptr() != &scope_node)
m_scope_stack.take_last();
}
void Interpreter::do_return()
{
dbg() << "FIXME: Implement Interpreter::do_return()";
// If we unwind all the way, just reset m_unwind_until so that future "return" doesn't break.
if (m_scope_stack.is_empty())
m_unwind_until = ScopeType::None;
}
void Interpreter::declare_variable(const FlyString& name, DeclarationType declaration_type)

5
Libraries/LibJS/Interpreter.h
View file

@ -37,6 +37,7 @@
namespace JS {
enum class ScopeType {
None,
Function,
Block,
};
@ -74,7 +75,7 @@ public:
Heap& heap() { return m_heap; }
void do_return();
void unwind(ScopeType type) { m_unwind_until = type; }
Value get_variable(const FlyString& name);
void set_variable(const FlyString& name, Value, bool first_assignment = false);
@ -114,6 +115,8 @@ private:
Object* m_string_prototype { nullptr };
Object* m_object_prototype { nullptr };
Object* m_array_prototype { nullptr };
ScopeType m_unwind_until { ScopeType::None };
};
}