41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
/* file Environment.hpp
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*
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* author: Roland Conybeare, Jun 2024
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*/
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#pragma once
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#include "xo/refcnt/Refcounted.hpp"
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#include "binding_path.hpp"
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namespace xo {
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namespace ast {
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class Expression;
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class Environment : public ref::Refcount {
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public:
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/** true if this is toplevel (global) environment.
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* Toplevel environment doesn't have slot numbers.
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*
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* Variables that bind in the global environment have unique
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* names, which we rely on instead of slot numbers.
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**/
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virtual bool is_global_env() const = 0;
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/** lookup binding path for @p vname in this environment.
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*
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* Reports ingredients needed to address variable at runtime,
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* in runtime analog of this environment
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**/
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virtual binding_path lookup_binding(const std::string & vname) const = 0;
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/** lookup variable-expression @p vname in this environment.
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* returns llvm::Value representing code that produces a value for vname
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**/
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virtual ref::brw<Expression> lookup_var(const std::string & vname) const = 0;
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};
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} /*namespace ast*/
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} /*namespace xo*/
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/* end Environment.hpp */
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