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Geoff RomerandJon Meow
17e0a1afb9
This doesn't actually use the results of name resolution, but it does verify that they are present. Also ensures that name resolution and type checking are applied to deduced function parameters and the implicit call to `Main()`. Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
55 lines
1.8 KiB
C++
55 lines
1.8 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/ast/static_scope.h"
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#include "executable_semantics/common/error.h"
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namespace Carbon {
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NamedEntity::~NamedEntity() = default;
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void StaticScope::Add(std::string name, Nonnull<const NamedEntity*> entity) {
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if (!declared_names_.insert({name, entity}).second) {
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FATAL_COMPILATION_ERROR(entity->source_loc())
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<< "Duplicate name `" << name << "` also found at "
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<< declared_names_[name]->source_loc();
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}
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}
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auto StaticScope::Resolve(const std::string& name,
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SourceLocation source_loc) const
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-> Nonnull<const NamedEntity*> {
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std::optional<Nonnull<const NamedEntity*>> result =
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TryResolve(name, source_loc);
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if (!result.has_value()) {
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FATAL_COMPILATION_ERROR(source_loc)
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<< "'" << name << "' is not declared in this scope";
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}
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return *result;
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}
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auto StaticScope::TryResolve(const std::string& name,
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SourceLocation source_loc) const
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-> std::optional<Nonnull<const NamedEntity*>> {
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auto it = declared_names_.find(name);
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if (it != declared_names_.end()) {
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return it->second;
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}
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std::optional<Nonnull<const NamedEntity*>> result;
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for (Nonnull<const StaticScope*> parent : parent_scopes_) {
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auto parent_result = parent->TryResolve(name, 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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<< "'" << name << "' is ambiguous between " << (*result)->source_loc()
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<< " and " << (*parent_result)->source_loc();
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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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} // namespace Carbon
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