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Basic support for parameterized interfaces. (#1220)

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To make this work, introduce impl bindings into scope immediately when type-checking. We may rely on their existence before we finish type-checking the enclosing pattern.
This commit is contained in:
Richard Smith
2022-04-29 12:42:15 -07:00
committed by GitHub
parent b9538129a2
commit 3b58a1bf48
15 changed files with 513 additions and 197 deletions
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executable_semantics/interpreter/value.cpp
+20 -4
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@@ -334,6 +334,14 @@ void Value::Print(llvm::raw_ostream& out) const {
case Value::Kind::InterfaceType: {
const auto& iface_type = cast<InterfaceType>(*this);
out << "interface " << iface_type.declaration().name();
if (!iface_type.args().empty()) {
out << "(";
llvm::ListSeparator sep;
for (const auto& [bind, val] : iface_type.args()) {
out << sep << bind->name() << " = " << *val;
}
out << ")";
}
break;
}
case Value::Kind::Witness: {
@@ -456,15 +464,23 @@ auto TypeEqual(Nonnull<const Value*> t1, Nonnull<const Value*> t2) -> bool {
}
for (const auto& [ty_var1, ty1] :
cast<NominalClassType>(*t1).type_args()) {
if (!TypeEqual(ty1,
cast<NominalClassType>(*t2).type_args().at(ty_var1))) {
if (!ValueEqual(ty1,
cast<NominalClassType>(*t2).type_args().at(ty_var1))) {
return false;
}
}
return true;
case Value::Kind::InterfaceType:
return cast<InterfaceType>(*t1).declaration().name() ==
cast<InterfaceType>(*t2).declaration().name();
if (cast<InterfaceType>(*t1).declaration().name() !=
cast<InterfaceType>(*t2).declaration().name()) {
return false;
}
for (const auto& [ty_var1, ty1] : cast<InterfaceType>(*t1).args()) {
if (!ValueEqual(ty1, cast<InterfaceType>(*t2).args().at(ty_var1))) {
return false;
}
}
return true;
case Value::Kind::ChoiceType:
return cast<ChoiceType>(*t1).name() == cast<ChoiceType>(*t2).name();
case Value::Kind::TupleValue: {