48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
/** @file DGlobalEnv.hpp
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*
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* @author Roland Conybeare, Feb 2026
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**/
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#pragma once
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#include <xo/expression2/DGlobalSymtab.hpp>
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#include <xo/object2/DArray.hpp>
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namespace xo {
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namespace scm {
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/** @brief runtime bindings for global variabels
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*
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* Implementation here uses a DArenaHashMap to hold <key,value> pairs.
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* The hash map has its own memory outside GC space.
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* Keys are DUniqueStrings, also outside GC space.
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* Values are regular gc-aware objects, generally will be in GC space.
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*
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* We need collector to traverse all the values in a global env
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* on each cycle. Arrange that by having DGlobalEnv itself
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* in GC space.
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*
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**/
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class DGlobalEnv {
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public:
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using MemorySizeVisitor = xo::mm::MemorySizeVisitor;
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public:
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DGlobalEnv() = default;
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/** visit env-owned memory pools; call visitor(info) for each **/
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void visit_pools(const MemorySizeVisitor & visitor) const;
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protected: // temporary, to appease compiler
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// absurd O(n) implementation for now
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// replace with gc-aware hashtable, when available.
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/** symbol table assigns a unique index for each symbol **/
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DGlobalSymtab * symtab_;
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/** value for a symbol S will be in values_[symtab->lookup_binding(S)] **/
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DArray * values_ = nullptr;
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};
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}
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}
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