69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
/** @file DVsmApplyFrame.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 "VsmInstr.hpp"
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#include <xo/procedure2/Procedure.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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class DVsmApplyFrame {
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public:
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using AProcedure = xo::scm::AProcedure;
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using ACollector = xo::mm::ACollector;
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using AAllocator = xo::mm::AAllocator;
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using AGCObject = xo::mm::AGCObject;
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using ppindentinfo = xo::print::ppindentinfo;
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public:
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DVsmApplyFrame(obj<AGCObject> old_parent,
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VsmInstr old_cont,
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DArray * args);
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/** create instance using memory from @p mm **/
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static DVsmApplyFrame * make(obj<AAllocator> mm,
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obj<AGCObject> old_parent,
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VsmInstr old_cont,
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DArray * args);
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obj<AGCObject> parent() const noexcept { return parent_; }
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VsmInstr cont() const noexcept { return cont_; }
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obj<AGCObject> fn() const noexcept { return fn_; }
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DArray * args() const noexcept { return args_; }
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void assign_fn(obj<AGCObject> x) { this->fn_ = x; }
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std::size_t shallow_size() const noexcept;
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DVsmApplyFrame * shallow_copy(obj<AAllocator> mm) const noexcept;
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std::size_t forward_children(obj<ACollector> gc) noexcept;
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/** pretty-printing support **/
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bool pretty(const ppindentinfo & ppii) const;
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private:
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/** saved VSM stack; restore when this frame consumed **/
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obj<AGCObject> parent_;
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/** saved continuation; restore when this frame consumed **/
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VsmInstr cont_;
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/** evaluated target procedure.
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*
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* note: when initially created, this will be unpopulated;
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* don't know correct value until we evaluate
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* expression in head position.
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*
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* Must exhibit either:
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* 1. AProcedure facet (runs natively)
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* 2. AVsmProcedure facet (requires schematika runtime)
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**/
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obj<AGCObject> fn_;
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/** evaluated arguments (to target procedure) **/
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DArray * args_;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/* end DVsmApplyFrame.hpp */
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