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xo-interpreter: implement variable lookup

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This commit is contained in:
Roland Conybeare 2025-11-25 12:43:57 -05:00
commit d91a2ae08e
10 changed files with 140 additions and 13 deletions
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28
xo-interpreter/src/interpreter/GlobalEnv.cpp
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@ -35,9 +35,28 @@ namespace xo {
return symtab_->lookup_local(vname).get();
}
void
gp<Object> *
GlobalEnv::lookup_slot(const std::string & vname)
{
scope log(XO_DEBUG(true), xtag("name", vname));
assert(slot_map_.get());
auto ix = slot_map_->find(vname);
if (ix == slot_map_->end()) {
return nullptr;
} else {
log && log("binding found", xtag("vname", vname));
return &(ix->second);
}
}
gp<Object> *
GlobalEnv::establish_var(bp<Variable> var)
{
scope log(XO_DEBUG(true), xtag("name", var->name()), xtag("type", var->valuetype()));
// Warning: altering declared type for an already-existing variable
// invalidates any type checking that relied on that variable.
//
@ -60,7 +79,12 @@ namespace xo {
this->symtab_->require_global(var->name(), var);
(*this->slot_map_)[var->name()] = gp<Object>();
gp<Object> &slot = (*this->slot_map_)[var->name()];
/* discard any pre-existing value, we're redefining a variable */
slot = gp<Object>();
return &slot;
}
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