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a63b0cfaba
This hosts the ability to compile and run JavaScript to implement native functions. This is particularly useful for any native function that is not a normal function, for example async functions such as Array.fromAsync, which require yielding. These functions are not allowed to observe anything from outside their environment. Any global identifiers will instead be assumed to be a reference to an abstract operation or a constant. The generator will inject the appropriate bytecode if the name of the global identifier matches a known name. Anything else will cause a code generation error.
63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <andreas@ladybird.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/Runtime/Completion.h>
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#include <LibJS/Runtime/DeclarativeEnvironment.h>
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namespace JS {
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class FunctionEnvironment final : public DeclarativeEnvironment {
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JS_ENVIRONMENT(FunctionEnvironment, DeclarativeEnvironment);
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GC_DECLARE_ALLOCATOR(FunctionEnvironment);
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public:
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enum class ThisBindingStatus : u8 {
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Lexical,
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Initialized,
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Uninitialized,
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};
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virtual ~FunctionEnvironment() override = default;
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ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
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void set_this_binding_status(ThisBindingStatus status) { m_this_binding_status = status; }
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FunctionObject& function_object() { return *m_function_object; }
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FunctionObject const& function_object() const { return *m_function_object; }
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void set_function_object(FunctionObject& function) { m_function_object = &function; }
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Value new_target() const { return m_new_target; }
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void set_new_target(Value new_target)
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{
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VERIFY(!new_target.is_special_empty_value());
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m_new_target = new_target;
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}
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// Abstract operations
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ThrowCompletionOr<Value> get_super_base() const;
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bool has_super_binding() const;
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virtual bool has_this_binding() const override;
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virtual ThrowCompletionOr<Value> get_this_binding(VM&) const override;
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ThrowCompletionOr<Value> bind_this_value(VM&, Value);
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private:
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explicit FunctionEnvironment(Environment* parent_environment);
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virtual bool is_function_environment() const override { return true; }
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virtual void visit_edges(Visitor&) override;
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Value m_this_value; // [[ThisValue]]
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ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized }; // [[ThisBindingStatus]]
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GC::Ptr<FunctionObject> m_function_object; // [[FunctionObject]]
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Value m_new_target { js_undefined() }; // [[NewTarget]]
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};
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template<>
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inline bool Environment::fast_is<FunctionEnvironment>() const { return is_function_environment(); }
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}
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