mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 07:20:10 +01:00
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "executable_semantics/interpreter/impl_scope.h"
|
|
|
|
#include "executable_semantics/common/error_builders.h"
|
|
#include "executable_semantics/interpreter/value.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/Support/Casting.h"
|
|
|
|
using llvm::cast;
|
|
|
|
namespace Carbon {
|
|
|
|
void ImplScope::Add(Nonnull<const Value*> iface, Nonnull<const Value*> type,
|
|
ValueNodeView impl) {
|
|
impls_.push_back({.interface = iface, .type = type, .impl = impl});
|
|
}
|
|
|
|
void ImplScope::AddParent(Nonnull<const ImplScope*> parent) {
|
|
parent_scopes_.push_back(parent);
|
|
}
|
|
|
|
auto ImplScope::Resolve(Nonnull<const Value*> iface_type,
|
|
Nonnull<const Value*> type,
|
|
SourceLocation source_loc) const
|
|
-> ErrorOr<ValueNodeView> {
|
|
ASSIGN_OR_RETURN(std::optional<ValueNodeView> result,
|
|
TryResolve(iface_type, type, source_loc));
|
|
if (!result.has_value()) {
|
|
return CompilationError(source_loc) << "could not find implementation of "
|
|
<< *iface_type << " for " << *type;
|
|
}
|
|
return *result;
|
|
}
|
|
|
|
auto ImplScope::TryResolve(Nonnull<const Value*> iface_type,
|
|
Nonnull<const Value*> type,
|
|
SourceLocation source_loc) const
|
|
-> ErrorOr<std::optional<ValueNodeView>> {
|
|
std::optional<ValueNodeView> result =
|
|
ResolveHere(iface_type, type, source_loc);
|
|
if (result.has_value()) {
|
|
return result;
|
|
}
|
|
for (Nonnull<const ImplScope*> parent : parent_scopes_) {
|
|
ASSIGN_OR_RETURN(auto parent_result,
|
|
parent->TryResolve(iface_type, type, source_loc));
|
|
if (parent_result.has_value() && result.has_value() &&
|
|
*parent_result != *result) {
|
|
return CompilationError(source_loc) << "ambiguous implementations of "
|
|
<< *iface_type << " for " << *type;
|
|
}
|
|
result = parent_result;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
auto ImplScope::ResolveHere(Nonnull<const Value*> iface_type,
|
|
Nonnull<const Value*> impl_type,
|
|
SourceLocation /*source_loc*/) const
|
|
-> std::optional<ValueNodeView> {
|
|
switch (iface_type->kind()) {
|
|
case Value::Kind::InterfaceType: {
|
|
const auto& iface = cast<InterfaceType>(*iface_type);
|
|
for (const Impl& impl : impls_) {
|
|
if (TypeEqual(&iface, impl.interface) &&
|
|
TypeEqual(impl_type, impl.type)) {
|
|
return impl.impl;
|
|
}
|
|
}
|
|
return std::nullopt;
|
|
}
|
|
default:
|
|
FATAL() << "expected an interface, not " << *iface_type;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// TODO: Add indentation when printing the parents.
|
|
void ImplScope::Print(llvm::raw_ostream& out) const {
|
|
out << "impls: ";
|
|
llvm::ListSeparator sep;
|
|
for (const Impl& impl : impls_) {
|
|
out << sep << *(impl.type) << " as " << *(impl.interface);
|
|
}
|
|
out << "\n";
|
|
for (const Nonnull<const ImplScope*>& parent : parent_scopes_) {
|
|
out << *parent;
|
|
}
|
|
}
|
|
|
|
} // namespace Carbon
|