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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Generator.h"
#include "PassManager.h"
#include <LibJS/Bytecode/Label.h>
#include <LibJS/Bytecode/Register.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/Cell.h>
#include <LibJS/Heap/Handle.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/Value.h>
namespace JS::Bytecode {
struct RegisterWindow {
MarkedVector<Value> registers;
MarkedVector<Environment*> saved_lexical_environments;
MarkedVector<Environment*> saved_variable_environments;
Vector<UnwindInfo> unwind_contexts;
};
class Interpreter {
public:
explicit Interpreter(Realm&);
~Interpreter();
// FIXME: Remove this thing once we don't need it anymore!
static Interpreter* current();
Realm& realm() { return m_realm; }
VM& vm() { return m_vm; }
ThrowCompletionOr<Value> run(Bytecode::Executable const& executable, Bytecode::BasicBlock const* entry_point = nullptr)
{
auto value_and_frame = run_and_return_frame(executable, entry_point);
return move(value_and_frame.value);
}
struct ValueAndFrame {
ThrowCompletionOr<Value> value;
OwnPtr<RegisterWindow> frame;
};
ValueAndFrame run_and_return_frame(Bytecode::Executable const&, Bytecode::BasicBlock const* entry_point, RegisterWindow* = nullptr);
ALWAYS_INLINE Value& accumulator() { return reg(Register::accumulator()); }
Value& reg(Register const& r) { return registers()[r.index()]; }
auto& saved_lexical_environment_stack() { return window().saved_lexical_environments; }
auto& saved_variable_environment_stack() { return window().saved_variable_environments; }
auto& unwind_contexts() { return window().unwind_contexts; }
void jump(Label const& label)
{
m_pending_jump = &label.block();
}
void do_return(Value return_value) { m_return_value = return_value; }
void enter_unwind_context(Optional<Label> handler_target, Optional<Label> finalizer_target);
void leave_unwind_context();
ThrowCompletionOr<void> continue_pending_unwind(Label const& resume_label);
Executable const& current_executable() { return *m_current_executable; }
BasicBlock const& current_block() const { return *m_current_block; }
size_t pc() const { return m_pc ? m_pc->offset() : 0; }
String debug_position()
{
return String::formatted("{}:{:2}:{:4x}", m_current_executable->name, m_current_block->name(), pc());
}
enum class OptimizationLevel {
None,
Optimize,
__Count,
Default = None,
};
static Bytecode::PassManager& optimization_pipeline(OptimizationLevel = OptimizationLevel::Default);
VM::InterpreterExecutionScope ast_interpreter_scope();
private:
RegisterWindow& window()
{
return m_register_windows.last().visit([](auto& x) -> RegisterWindow& { return *x; });
}
RegisterWindow const& window() const
{
return const_cast<Interpreter*>(this)->window();
}
MarkedVector<Value>& registers() { return window().registers; }
static AK::Array<OwnPtr<PassManager>, static_cast<UnderlyingType<Interpreter::OptimizationLevel>>(Interpreter::OptimizationLevel::__Count)> s_optimization_pipelines;
VM& m_vm;
Realm& m_realm;
Vector<Variant<NonnullOwnPtr<RegisterWindow>, RegisterWindow*>> m_register_windows;
Optional<BasicBlock const*> m_pending_jump;
Value m_return_value;
Executable const* m_current_executable { nullptr };
Handle<Value> m_saved_exception;
OwnPtr<JS::Interpreter> m_ast_interpreter;
BasicBlock const* m_current_block { nullptr };
InstructionStreamIterator* m_pc { nullptr };
};
extern bool g_dump_bytecode;
}
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