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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.h
+33
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@@ -560,6 +560,12 @@ class NominalClassType : public Value {
// instantiated runtime type of a generic class.
auto witnesses() const -> const ImplWitnessMap& { return witnesses_; }
// Returns whether this a parameterized class. That is, a class with
// parameters and no corresponding arguments.
auto IsParameterized() const -> bool {
return declaration_->type_params().has_value() && type_args_.empty();
}
// Returns the value of the function named `name` in this class, or
// nullopt if there is no such function.
auto FindFunction(const std::string& name) const
@@ -582,6 +588,21 @@ class InterfaceType : public Value {
public:
explicit InterfaceType(Nonnull<const InterfaceDeclaration*> declaration)
: Value(Kind::InterfaceType), declaration_(declaration) {}
explicit InterfaceType(Nonnull<const InterfaceDeclaration*> declaration,
const BindingMap& args)
: Value(Kind::InterfaceType), declaration_(declaration), args_(args) {}
explicit InterfaceType(Nonnull<const InterfaceDeclaration*> declaration,
const BindingMap& args, const ImplExpMap& impls)
: Value(Kind::InterfaceType),
declaration_(declaration),
args_(args),
impls_(impls) {}
explicit InterfaceType(Nonnull<const InterfaceDeclaration*> declaration,
const BindingMap& args, const ImplWitnessMap& wits)
: Value(Kind::InterfaceType),
declaration_(declaration),
args_(args),
witnesses_(wits) {}
static auto classof(const Value* value) -> bool {
return value->kind() == Kind::InterfaceType;
@@ -590,9 +611,21 @@ class InterfaceType : public Value {
auto declaration() const -> const InterfaceDeclaration& {
return *declaration_;
}
auto args() const -> const BindingMap& { return args_; }
// FIXME: These aren't used for anything yet.
auto impls() const -> const ImplExpMap& { return impls_; }
auto witnesses() const -> const ImplWitnessMap& { return witnesses_; }
auto IsParameterized() const -> bool {
return declaration_->params().has_value() && args_.empty();
}
private:
Nonnull<const InterfaceDeclaration*> declaration_;
BindingMap args_;
ImplExpMap impls_;
ImplWitnessMap witnesses_;
};
// The witness table for an impl.