Roland Conybeare
043b2d7efc
subrepo: subdir: "xo-expression" merged: "fbc5b619" upstream: origin: "git@github.com:Rconybea/xo-expression.git" branch: "main" commit: "fbc5b619" git-subrepo: version: "0.4.9" origin: "???" commit: "???"
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/* file GlobalSymtab.hpp
|
|
*
|
|
* author: Roland Conybeare, Jun 2024
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "SymbolTable.hpp"
|
|
#include <map>
|
|
#include <string>
|
|
|
|
namespace xo {
|
|
namespace scm {
|
|
class GlobalSymtab : public SymbolTable {
|
|
public:
|
|
/** create instance. Probably only need one of these **/
|
|
static rp<GlobalSymtab> make_empty() { return new GlobalSymtab(); }
|
|
|
|
bp<Expression> require_global(const std::string & vname,
|
|
bp<Expression> expr);
|
|
|
|
// ----- Environment -----
|
|
|
|
virtual bool is_global_env() const override { return true; }
|
|
|
|
virtual binding_path lookup_binding(const std::string & /*vname*/) const override {
|
|
/* i_link: -1 for global environment
|
|
* j_slot: not used
|
|
*/
|
|
return { -1, 0 };
|
|
}
|
|
|
|
virtual bp<Expression> lookup_var(const std::string & vname) const override {
|
|
return this->lookup_local(vname);
|
|
}
|
|
|
|
virtual bp<Expression> lookup_local(const std::string & vname) const override {
|
|
auto ix = global_map_.find(vname);
|
|
|
|
if (ix == global_map_.end()) {
|
|
/* not found */
|
|
return bp<Variable>();
|
|
}
|
|
|
|
return ix->second;
|
|
}
|
|
|
|
virtual void upsert_local(bp<Variable> target) override;
|
|
|
|
virtual void print(std::ostream & os) const override;
|
|
virtual std::uint32_t pretty_print(const xo::print::ppindentinfo & ppii) const override;
|
|
|
|
private:
|
|
GlobalSymtab();
|
|
|
|
private:
|
|
/* for assignable globals, need to allocate memory
|
|
* addresses for these.
|
|
*/
|
|
std::map<std::string, rp<Expression>> global_map_;
|
|
};
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|
|
|
|
|
|
/* end GlobalSymtab.hpp */
|