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xo-expression2: DGlobalSymtab mvp implementation

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This commit is contained in:
Roland Conybeare 2026-02-15 13:17:21 -05:00
commit b187f1a719
2 changed files with 109 additions and 22 deletions
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47
include/xo/expression2/DGlobalSymtab.hpp
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@ -25,18 +25,41 @@ namespace xo {
public:
using key_type = const DUniqueString *;
using value_type = Binding;
using ArenaHashMapConfig = xo::map::ArenaHashMapConfig;
using repr_type = xo::map::DArenaHashMap<key_type, Binding::slot_type>;
using ACollector = xo::mm::ACollector;
using AAllocator = xo::mm::AAllocator;
using MemorySizeVisitor = xo::mm::MemorySizeVisitor;
public:
/** @defgroup scm-globalsymtab-ctors constructors **/
///@{
DGlobalSymtab(repr_type * map, DArray * vars);
/** create instance.
* Use memory from @p fixed_mm for @ref map_.
* Use memory from @p mm for DGlobalSymtab instance.
* Hashmap configured per @p cfg.
**/
DGlobalSymtab * make(obj<AAllocator> fixed_mm,
obj<AAllocator> mm,
const ArenaHashMapConfig & cfg);
///@}
/** @defgroup scm-globalsymtab-access-methods access methods **/
///@{
/** visit symtab-owned memory pools; call visitor(info) for each **/
void visit_pools(const MemorySizeVisitor & visitor) const;
public:
/** lookup global symbol with name @p sym **/
DVariable * lookup_variable(const DUniqueString * sym) const noexcept;
///@}
/** @defgroup scm-globalsymtab-general-methods general methods **/
///@{
/** establish binding for @p sym, with type described by @p typeref,
* replacing existing global (if present) with the same name.
* Use memory from @p mm to create variable-expr
@ -45,7 +68,8 @@ namespace xo {
const DUniqueString * sym,
TypeRef typeref);
/** @defgroup xo-expression2-symboltable-facet symboltable facet**/
///@}
/** @defgroup scm-globalsymtab-symboltable-facet symboltable facet **/
///@{
/** true for global symbol table **/
@ -55,13 +79,22 @@ namespace xo {
Binding lookup_binding(const DUniqueString * sym) const noexcept;
///@}
/** @defgroup scm-globalsymtab-gcobject-facet gcobject facet **/
///@{
std::size_t shallow_size() const noexcept;
DGlobalSymtab * shallow_copy(obj<AAllocator> mm) const noexcept;
std::size_t forward_children(obj<ACollector> gc) noexcept;
///@}
private:
/** next binding will use this global index. See DGlobalEnv **/
uint32_t next_binding_ix_ = 0;
/** map symbols -> bindings **/
repr_type map_;
/** map symbols -> bindings.
* Minor point: storing offsets instead of Variables allows us to omit
* iterating over map elements during GC. Possible savings if map_ slots
* sparsely populated.
**/
repr_type * map_ = nullptr;
/** array of variables.
* When S is a unique-string for a global symbol, then: