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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FlyString.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/Weakable.h>
#include <LibJS/AST.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/DeferGC.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Heap/MarkedVector.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/ErrorTypes.h>
#include <LibJS/Runtime/GlobalEnvironment.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Script.h>
#include <LibJS/SourceTextModule.h>
namespace JS {
struct ExecutingASTNodeChain {
ExecutingASTNodeChain* previous { nullptr };
ASTNode const& node;
};
class Interpreter : public Weakable<Interpreter> {
public:
template<typename GlobalObjectType, typename... Args>
static NonnullOwnPtr<Interpreter> create(VM& vm, Args&&... args) requires(IsBaseOf<GlobalObject, GlobalObjectType>)
{
DeferGC defer_gc(vm.heap());
auto interpreter = adopt_own(*new Interpreter(vm));
VM::InterpreterExecutionScope scope(*interpreter);
GlobalObject* global_object { nullptr };
interpreter->m_global_execution_context = MUST(Realm::initialize_host_defined_realm(
vm,
[&](Realm& realm) -> GlobalObject* {
global_object = interpreter->heap().allocate_without_realm<GlobalObjectType>(realm, forward<Args>(args)...);
return global_object;
},
nullptr));
// NOTE: These are not in the spec.
static FlyString global_execution_context_name = "(global execution context)";
interpreter->m_global_execution_context->function_name = global_execution_context_name;
interpreter->m_global_object = make_handle(global_object);
interpreter->m_realm = make_handle(global_object->associated_realm());
return interpreter;
}
static NonnullOwnPtr<Interpreter> create_with_existing_realm(Realm&);
~Interpreter() = default;
ThrowCompletionOr<Value> run(Script&);
ThrowCompletionOr<Value> run(SourceTextModule&);
GlobalObject& global_object();
GlobalObject const& global_object() const;
Realm& realm();
Realm const& realm() const;
ALWAYS_INLINE VM& vm() { return *m_vm; }
ALWAYS_INLINE const VM& vm() const { return *m_vm; }
ALWAYS_INLINE Heap& heap() { return vm().heap(); }
Environment* lexical_environment() { return vm().lexical_environment(); }
void push_ast_node(ExecutingASTNodeChain& chain_node)
{
chain_node.previous = m_ast_node_chain;
m_ast_node_chain = &chain_node;
}
void pop_ast_node()
{
VERIFY(m_ast_node_chain);
m_ast_node_chain = m_ast_node_chain->previous;
}
ASTNode const* current_node() const { return m_ast_node_chain ? &m_ast_node_chain->node : nullptr; }
private:
explicit Interpreter(VM&);
ExecutingASTNodeChain* m_ast_node_chain { nullptr };
NonnullRefPtr<VM> m_vm;
Handle<GlobalObject> m_global_object;
Handle<Realm> m_realm;
// This is here to keep the global execution context alive for the entire lifespan of the Interpreter.
OwnPtr<ExecutionContext> m_global_execution_context;
};
}
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