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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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/ErrorTypes.h>
#include <LibJS/Runtime/Exception.h>
#include <LibJS/Runtime/LexicalEnvironment.h>
#include <LibJS/Runtime/MarkedValueList.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
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();
return interpreter;
}
static NonnullOwnPtr<Interpreter> create_with_existing_global_object(GlobalObject&);
template<typename... Args>
[[nodiscard]] ALWAYS_INLINE Value call(Function& function, Value this_value, Args... args)
{
// Are there any values in this argpack?
// args = [] -> if constexpr (false)
// args = [x, y, z] -> if constexpr ((void)x, true || ...)
if constexpr ((((void)args, true) || ...)) {
MarkedValueList arglist { heap() };
(..., arglist.append(move(args)));
return call(function, this_value, move(arglist));
}
return call(function, this_value);
}
~Interpreter();
Value run(GlobalObject&, const Program&);
GlobalObject& global_object();
const GlobalObject& global_object() const;
VM& vm() { return *m_vm; }
const VM& vm() const { return *m_vm; }
Heap& heap() { return vm().heap(); }
Exception* exception() { return vm().exception(); }
bool in_strict_mode() const
{
// FIXME: This implementation is bogus; strict mode is per-file or per-function, not per-block!
if (m_scope_stack.is_empty())
return true;
return m_scope_stack.last().scope_node->in_strict_mode();
}
size_t argument_count() const { return vm().argument_count(); }
Value argument(size_t index) const { return vm().argument(index); }
Value this_value(Object& global_object) const { return vm().this_value(global_object); }
LexicalEnvironment* current_environment() { return vm().current_environment(); }
const CallFrame& call_frame() { return vm().call_frame(); }
void enter_scope(const ScopeNode&, ArgumentVector, ScopeType, GlobalObject&);
void exit_scope(const ScopeNode&);
Value execute_statement(GlobalObject&, const Statement&, ArgumentVector = {}, ScopeType = ScopeType::Block);
private:
explicit Interpreter(VM&);
[[nodiscard]] Value call_internal(Function& function, Value this_value, Optional<MarkedValueList> arguments)
{
return vm().call(function, this_value, move(arguments));
}
NonnullRefPtr<VM> m_vm;
Handle<Object> m_global_object;
Vector<ScopeFrame> m_scope_stack;
};
template<>
[[nodiscard]] ALWAYS_INLINE Value Interpreter::call(Function& function, Value this_value, MarkedValueList arguments) { return call_internal(function, this_value, move(arguments)); }
template<>
[[nodiscard]] ALWAYS_INLINE Value Interpreter::call(Function& function, Value this_value, Optional<MarkedValueList> arguments) { return call_internal(function, this_value, move(arguments)); }
template<>
[[nodiscard]] ALWAYS_INLINE Value Interpreter::call(Function& function, Value this_value) { return call(function, this_value, Optional<MarkedValueList> {}); }
}
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