cc9ec6693b
While this would be useful in the future for implementing a multi-tiered optimization strategy, currently a binary on/off is enough for us. This removes the confusingly on-by-default `OptimizationLevel::None` option which made the optimization pipeline a no-op even if `Bytecode::Interpreter::set_optimizations_enabled` had been called. Fixes #15982
123 lines
4 KiB
C++
123 lines
4 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 <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/FunctionKind.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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class InstructionStreamIterator;
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class PassManager;
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struct RegisterWindow {
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MarkedVector<Value> registers;
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MarkedVector<GCPtr<Environment>> saved_lexical_environments;
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MarkedVector<GCPtr<Environment>> saved_variable_environments;
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Vector<UnwindInfo> unwind_contexts;
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};
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class Interpreter {
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public:
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[[nodiscard]] static bool enabled();
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static void set_enabled(bool);
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static void set_optimizations_enabled(bool);
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explicit Interpreter(VM&);
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~Interpreter();
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Realm& realm();
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VM& vm() { return m_vm; }
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ThrowCompletionOr<Value> run(Script&, JS::GCPtr<Environment> lexical_environment_override = nullptr);
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ThrowCompletionOr<Value> run(SourceTextModule&);
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ThrowCompletionOr<Value> run(Realm& realm, 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(realm, 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(Realm&, Bytecode::Executable const&, Bytecode::BasicBlock const* entry_point, RegisterWindow* = nullptr);
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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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auto& saved_lexical_environment_stack() { return window().saved_lexical_environments; }
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auto& saved_variable_environment_stack() { return window().saved_variable_environments; }
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auto& unwind_contexts() { return window().unwind_contexts; }
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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 schedule_jump(Label const& label)
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{
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m_scheduled_jump = &label.block();
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VERIFY(unwind_contexts().last().finalizer);
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jump(Label { *unwind_contexts().last().finalizer });
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}
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void do_return(Value return_value)
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{
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m_return_value = return_value;
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m_saved_exception = {};
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}
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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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BasicBlock const& current_block() const { return *m_current_block; }
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size_t pc() const;
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DeprecatedString debug_position() const;
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static Bytecode::PassManager& optimization_pipeline();
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VM::InterpreterExecutionScope ast_interpreter_scope(Realm&);
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private:
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RegisterWindow& window()
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{
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return m_register_windows.last().visit([](auto& x) -> RegisterWindow& { return *x; });
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}
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RegisterWindow const& window() const
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{
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return const_cast<Interpreter*>(this)->window();
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}
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MarkedVector<Value>& registers() { return window().registers; }
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VM& m_vm;
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Vector<Variant<NonnullOwnPtr<RegisterWindow>, RegisterWindow*>> m_register_windows;
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Optional<BasicBlock const*> m_pending_jump;
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BasicBlock const* m_scheduled_jump { nullptr };
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Value m_return_value;
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Handle<Value> m_saved_return_value;
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Executable const* m_current_executable { nullptr };
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Handle<Value> m_saved_exception;
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OwnPtr<JS::Interpreter> m_ast_interpreter;
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BasicBlock const* m_current_block { nullptr };
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InstructionStreamIterator* m_pc { nullptr };
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};
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extern bool g_dump_bytecode;
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ThrowCompletionOr<NonnullOwnPtr<Bytecode::Executable>> compile(VM&, ASTNode const& no, JS::FunctionKind kind, DeprecatedFlyString const& name);
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}
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