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LibJS: Move most of Interpreter into VM

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This patch moves the exception state, call stack and scope stack from
Interpreter to VM. I'm doing this to help myself discover what the
split between Interpreter and VM should be, by shuffling things around
and seeing what falls where.

With these changes, we no longer have a persistent lexical environment
for the current global object on the Interpreter's call stack. Instead,
we push/pop that environment on Interpreter::run() enter/exit.
Since it should only be used to find the global "this", and not for
variable storage (that goes directly into the global object instead!),
I had to insert some short-circuiting when walking the environment
parent chain during variable lookup.

Note that this is a "stepping stone" commit, not a final design.
This commit is contained in:
Andreas Kling 2020-09-27 15:18:55 +02:00
parent 838d9fa251
commit 6861c619c6
48 changed files with 765 additions and 726 deletions
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6
Libraries/LibJS/Runtime/ScriptFunction.cpp
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@ -41,7 +41,7 @@ static ScriptFunction* typed_this(Interpreter& interpreter, GlobalObject& global
if (!this_object)
return nullptr;
if (!this_object->is_function()) {
interpreter.throw_exception<TypeError>(ErrorType::NotAFunctionNoParam);
interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::NotAFunctionNoParam);
return nullptr;
}
return static_cast<ScriptFunction*>(this_object);
@ -130,13 +130,13 @@ Value ScriptFunction::call(Interpreter& interpreter)
arguments.append({ parameter.name, value });
interpreter.current_environment()->set(parameter.name, { value, DeclarationKind::Var });
}
return interpreter.execute_statement(global_object(), m_body, arguments, ScopeType::Function);
return interpreter.vm().execute_statement(global_object(), m_body, arguments, ScopeType::Function);
}
Value ScriptFunction::construct(Interpreter& interpreter, Function&)
{
if (m_is_arrow_function) {
interpreter.throw_exception<TypeError>(ErrorType::NotAConstructor, m_name.characters());
interpreter.vm().throw_exception<TypeError>(global_object(), ErrorType::NotAConstructor, m_name.characters());
return {};
}
return call(interpreter);