865e651a7d
Before this change both ExecutionContext and CallFrame were created before executing function/module/script with a couple exceptions: - executable created for default function argument evaluation has to run in function's execution context. - `execute_ast_node()` where executable compiled for ASTNode has to be executed in running execution context. This change moves all members previously owned by CallFrame into ExecutionContext, and makes two exceptions where an executable that does not have a corresponding execution context saves and restores registers before running. Now, all execution state lives in a single entity, which makes it a bit easier to reason about and opens opportunities for optimizations, such as moving registers and local variables into a single array.
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@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/Interpreter.h>
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#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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class GeneratorObject : public Object {
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JS_OBJECT(GeneratorObject, Object);
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JS_DECLARE_ALLOCATOR(GeneratorObject);
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public:
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static ThrowCompletionOr<NonnullGCPtr<GeneratorObject>> create(Realm&, Value, ECMAScriptFunctionObject*, NonnullOwnPtr<ExecutionContext>);
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virtual ~GeneratorObject() override = default;
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void visit_edges(Cell::Visitor&) override;
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ThrowCompletionOr<Value> resume(VM&, Value value, Optional<StringView> const& generator_brand);
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ThrowCompletionOr<Value> resume_abrupt(VM&, JS::Completion abrupt_completion, Optional<StringView> const& generator_brand);
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enum class GeneratorState {
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SuspendedStart,
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SuspendedYield,
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Executing,
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Completed,
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};
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GeneratorState generator_state() const { return m_generator_state; }
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void set_generator_state(GeneratorState generator_state) { m_generator_state = generator_state; }
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protected:
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GeneratorObject(Realm&, Object& prototype, NonnullOwnPtr<ExecutionContext>, Optional<StringView> generator_brand = {});
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ThrowCompletionOr<GeneratorState> validate(VM&, Optional<StringView> const& generator_brand);
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virtual ThrowCompletionOr<Value> execute(VM&, JS::Completion const& completion);
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private:
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NonnullOwnPtr<ExecutionContext> m_execution_context;
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GCPtr<ECMAScriptFunctionObject> m_generating_function;
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Value m_previous_value;
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GeneratorState m_generator_state { GeneratorState::SuspendedStart };
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Optional<StringView> m_generator_brand;
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};
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}
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