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LibJS: Perform function instantiation in bytecode

This replaces Bytecode::Op::EnterScope with a new NewFunction op that
instantiates a ScriptFunction from a given FunctionNode (AST).

This is then used to instantiate the local functions directly from
bytecode when entering a ScopeNode. :^)
This commit is contained in:
Andreas Kling 2021-06-10 00:49:23 +02:00
parent 941be2dcc2
commit b3e6a6c1cd
5 changed files with 16 additions and 21 deletions

View file

@ -22,7 +22,11 @@ void ASTNode::generate_bytecode(Bytecode::Generator&) const
void ScopeNode::generate_bytecode(Bytecode::Generator& generator) const
{
generator.emit<Bytecode::Op::EnterScope>(*this);
for (auto& function : functions()) {
generator.emit<Bytecode::Op::NewFunction>(function);
generator.emit<Bytecode::Op::SetVariable>(generator.intern_string(function.name()));
}
for (auto& child : children()) {
child.generate_bytecode(generator);
if (generator.is_current_block_terminated())

View file

@ -39,7 +39,7 @@
O(JumpConditional) \
O(JumpNullish) \
O(Call) \
O(EnterScope) \
O(NewFunction) \
O(Return) \
O(BitwiseAnd) \
O(BitwiseOr) \

View file

@ -210,21 +210,11 @@ void Call::execute(Bytecode::Interpreter& interpreter) const
interpreter.accumulator() = return_value;
}
void EnterScope::execute(Bytecode::Interpreter& interpreter) const
void NewFunction::execute(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
auto& global_object = interpreter.global_object();
for (auto& declaration : m_scope_node.functions())
vm.current_scope()->put_to_scope(declaration.name(), { js_undefined(), DeclarationKind::Var });
for (auto& declaration : m_scope_node.functions()) {
auto* function = ScriptFunction::create(global_object, declaration.name(), declaration.body(), declaration.parameters(), declaration.function_length(), vm.current_scope(), declaration.is_strict_mode());
vm.set_variable(declaration.name(), function, global_object);
}
// FIXME: Process variable declarations.
// FIXME: Whatever else JS::Interpreter::enter_scope() does.
interpreter.accumulator() = ScriptFunction::create(global_object, m_function_node.name(), m_function_node.body(), m_function_node.parameters(), m_function_node.function_length(), vm.current_scope(), m_function_node.is_strict_mode());
}
void Return::execute(Bytecode::Interpreter& interpreter) const
@ -384,9 +374,9 @@ String Call::to_string(Bytecode::Executable const&) const
return builder.to_string();
}
String EnterScope::to_string(Bytecode::Executable const&) const
String NewFunction::to_string(Bytecode::Executable const&) const
{
return "EnterScope";
return "NewFunction";
}
String Return::to_string(Bytecode::Executable const&) const

View file

@ -346,11 +346,11 @@ private:
Register m_arguments[];
};
class EnterScope final : public Instruction {
class NewFunction final : public Instruction {
public:
explicit EnterScope(ScopeNode const& scope_node)
: Instruction(Type::EnterScope)
, m_scope_node(scope_node)
explicit NewFunction(FunctionNode const& function_node)
: Instruction(Type::NewFunction)
, m_function_node(function_node)
{
}
@ -358,7 +358,7 @@ public:
String to_string(Bytecode::Executable const&) const;
private:
ScopeNode const& m_scope_node;
FunctionNode const& m_function_node;
};
class Return final : public Instruction {

View file

@ -114,6 +114,7 @@ class Error;
class ErrorType;
class Exception;
class Expression;
class FunctionNode;
class Accessor;
class GlobalObject;
class HandleImpl;