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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FlyString.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/Vector.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/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/ErrorTypes.h>
#include <LibJS/Runtime/Exception.h>
#include <LibJS/Runtime/MarkedValueList.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
struct ExecutingASTNodeChain {
ExecutingASTNodeChain* previous { nullptr };
const ASTNode& node;
};
class Interpreter : public Weakable<Interpreter> {
public:
template<typename GlobalObjectType, typename... Args>
static NonnullOwnPtr<Interpreter> create(VM& vm, Args&&... args)
{
DeferGC defer_gc(vm.heap());
auto interpreter = adopt_own(*new Interpreter(vm));
VM::InterpreterExecutionScope scope(*interpreter);
interpreter->m_global_object = make_handle(static_cast<Object*>(interpreter->heap().allocate_without_global_object<GlobalObjectType>(forward<Args>(args)...)));
static_cast<GlobalObjectType*>(interpreter->m_global_object.cell())->initialize_global_object();
return interpreter;
}
static NonnullOwnPtr<Interpreter> create_with_existing_global_object(GlobalObject&);
~Interpreter();
void run(GlobalObject&, const Program&);
GlobalObject& global_object();
const GlobalObject& global_object() const;
ALWAYS_INLINE VM& vm() { return *m_vm; }
ALWAYS_INLINE const VM& vm() const { return *m_vm; }
ALWAYS_INLINE Heap& heap() { return vm().heap(); }
ALWAYS_INLINE Exception* exception() { return vm().exception(); }
Environment* lexical_environment() { return vm().lexical_environment(); }
FunctionEnvironment* current_function_environment();
void enter_scope(const ScopeNode&, ScopeType, GlobalObject&);
void exit_scope(const ScopeNode&);
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;
}
const ASTNode* current_node() const { return m_ast_node_chain ? &m_ast_node_chain->node : nullptr; }
ExecutingASTNodeChain* executing_ast_node_chain() { return m_ast_node_chain; }
const ExecutingASTNodeChain* executing_ast_node_chain() const { return m_ast_node_chain; }
Value execute_statement(GlobalObject&, const Statement&, ScopeType = ScopeType::Block);
private:
explicit Interpreter(VM&);
void push_scope(ScopeFrame frame);
Vector<ScopeFrame> m_scope_stack;
ExecutingASTNodeChain* m_ast_node_chain { nullptr };
NonnullRefPtr<VM> m_vm;
Handle<Object> m_global_object;
};
}
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