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7cce1bd124
* interfaces, impls, and constrained generics (basics) * separate type checking into declare vs. type check, removing redundancy * external impls * added impl scopes to handle generics calling generics * cleanup * more cleanup * Update executable_semantics/testdata/interface/external_impl_point_vector.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/generic_call_generic.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/tuple_vector_add_scale.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/vector_point_add_scale.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * change ImplementationDeclaration to ImplDeclaration * remove impl_type_value * split NamedEntity into two * changed GetName to be a free function * adding comments * more edits to respond to review * introduce ImplBinding, remove punning on GenericBinding * new test case and some minor edits * refactor GetMember and GetField to move impl logic to interpreter * remove commennt * change EntityView to ImplBinding in FieldAccess... * move ImplBinding * review response * added example to impl_scope.h * minor edits * Update executable_semantics/interpreter/field_path.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/interpreter/value.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/interpreter/interpreter.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/expression.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/expression.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/generic_binding.h Co-authored-by: Geoff Romer <gromer@google.com> * more edits from review * review response * Update executable_semantics/ast/static_scope.h Co-authored-by: Geoff Romer <gromer@google.com> * remove ImplType, renamed node_view to value_node Co-authored-by: josh11b <josh11b@users.noreply.github.com> Co-authored-by: Geoff Romer <gromer@google.com>
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "executable_semantics/interpreter/impl_scope.h"
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#include "executable_semantics/common/error.h"
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#include "executable_semantics/interpreter/value.h"
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#include "llvm/Support/Casting.h"
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using llvm::cast;
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namespace Carbon {
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void ImplScope::Add(Nonnull<const Value*> iface, Nonnull<const Value*> type,
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ValueNodeView impl) {
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impls_.push_back({.interface = iface, .type = type, .impl = impl});
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}
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void ImplScope::AddParent(Nonnull<const ImplScope*> parent) {
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parent_scopes_.push_back(parent);
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}
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auto ImplScope::Resolve(Nonnull<const Value*> iface_type,
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Nonnull<const Value*> type,
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SourceLocation source_loc) const -> ValueNodeView {
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std::optional<ValueNodeView> result =
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TryResolve(iface_type, type, source_loc);
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if (!result.has_value()) {
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FATAL_COMPILATION_ERROR(source_loc) << "could not find implementation of "
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<< *iface_type << " for " << *type;
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}
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return *result;
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}
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auto ImplScope::TryResolve(Nonnull<const Value*> iface_type,
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Nonnull<const Value*> type,
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SourceLocation source_loc) const
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-> std::optional<ValueNodeView> {
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std::optional<ValueNodeView> result =
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ResolveHere(iface_type, type, source_loc);
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if (result.has_value()) {
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return result;
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}
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for (Nonnull<const ImplScope*> parent : parent_scopes_) {
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auto parent_result = parent->TryResolve(iface_type, type, source_loc);
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if (parent_result.has_value() && result.has_value() &&
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*parent_result != *result) {
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FATAL_COMPILATION_ERROR(source_loc)
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<< "ambiguous implementations of " << *iface_type << " for " << *type;
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}
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result = parent_result;
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}
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return result;
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}
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auto ImplScope::ResolveHere(Nonnull<const Value*> iface_type,
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Nonnull<const Value*> impl_type,
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SourceLocation source_loc) const
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-> std::optional<ValueNodeView> {
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switch (iface_type->kind()) {
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case Value::Kind::InterfaceType: {
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const auto& iface = cast<InterfaceType>(*iface_type);
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for (const Impl& impl : impls_) {
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if (TypeEqual(&iface, impl.interface) &&
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TypeEqual(impl_type, impl.type)) {
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return impl.impl;
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}
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}
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return std::nullopt;
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}
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default:
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FATAL() << "expected an interface, not " << *iface_type;
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break;
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}
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}
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} // namespace Carbon
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