1bbfaf8627
Now we emit CreateVariable and SetVariable with the appropriate initialization/environment modes, much closer to the spec. This makes a whole lot of things like let/const variables, function and variable hoisting and some other things work :^)
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "Generator.h"
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#include "PassManager.h"
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#include <LibJS/Bytecode/Label.h>
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#include <LibJS/Bytecode/Register.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Heap/Handle.h>
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#include <LibJS/Runtime/VM.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS::Bytecode {
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struct RegisterWindow {
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MarkedVector<Value> registers;
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MarkedVector<Environment*> saved_lexical_environments;
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MarkedVector<Environment*> saved_variable_environments;
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};
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class Interpreter {
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public:
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Interpreter(GlobalObject&, Realm&);
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~Interpreter();
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// FIXME: Remove this thing once we don't need it anymore!
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static Interpreter* current();
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GlobalObject& global_object() { return m_global_object; }
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Realm& realm() { return m_realm; }
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VM& vm() { return m_vm; }
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ThrowCompletionOr<Value> run(Bytecode::Executable const& executable, Bytecode::BasicBlock const* entry_point = nullptr)
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{
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auto value_and_frame = run_and_return_frame(executable, entry_point);
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return move(value_and_frame.value);
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}
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struct ValueAndFrame {
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ThrowCompletionOr<Value> value;
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OwnPtr<RegisterWindow> frame;
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};
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ValueAndFrame run_and_return_frame(Bytecode::Executable const&, Bytecode::BasicBlock const* entry_point);
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ALWAYS_INLINE Value& accumulator() { return reg(Register::accumulator()); }
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Value& reg(Register const& r) { return registers()[r.index()]; }
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[[nodiscard]] RegisterWindow snapshot_frame() const { return m_register_windows.last(); }
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auto& saved_lexical_environment_stack() { return m_register_windows.last().saved_lexical_environments; }
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auto& saved_variable_environment_stack() { return m_register_windows.last().saved_variable_environments; }
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void enter_frame(RegisterWindow const& frame)
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{
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m_manually_entered_frames.append(true);
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m_register_windows.append(make<RegisterWindow>(frame));
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}
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NonnullOwnPtr<RegisterWindow> pop_frame()
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{
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VERIFY(!m_manually_entered_frames.is_empty());
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VERIFY(m_manually_entered_frames.last());
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m_manually_entered_frames.take_last();
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return m_register_windows.take_last();
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}
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void jump(Label const& label)
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{
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m_pending_jump = &label.block();
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}
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void do_return(Value return_value) { m_return_value = return_value; }
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void enter_unwind_context(Optional<Label> handler_target, Optional<Label> finalizer_target);
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void leave_unwind_context();
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ThrowCompletionOr<void> continue_pending_unwind(Label const& resume_label);
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Executable const& current_executable() { return *m_current_executable; }
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enum class OptimizationLevel {
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Default,
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__Count,
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};
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static Bytecode::PassManager& optimization_pipeline(OptimizationLevel = OptimizationLevel::Default);
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VM::InterpreterExecutionScope ast_interpreter_scope();
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private:
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MarkedVector<Value>& registers() { return m_register_windows.last().registers; }
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static AK::Array<OwnPtr<PassManager>, static_cast<UnderlyingType<Interpreter::OptimizationLevel>>(Interpreter::OptimizationLevel::__Count)> s_optimization_pipelines;
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VM& m_vm;
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GlobalObject& m_global_object;
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Realm& m_realm;
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NonnullOwnPtrVector<RegisterWindow> m_register_windows;
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Vector<bool> m_manually_entered_frames;
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Optional<BasicBlock const*> m_pending_jump;
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Value m_return_value;
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Executable const* m_current_executable { nullptr };
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Vector<UnwindInfo> m_unwind_contexts;
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Handle<Value> m_saved_exception;
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OwnPtr<JS::Interpreter> m_ast_interpreter;
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};
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extern bool g_dump_bytecode;
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}
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