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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_RESOLVER_SEM_HELPER_H_
#define SRC_TINT_RESOLVER_SEM_HELPER_H_
#include <string>
#include "src/tint/diagnostic/diagnostic.h"
#include "src/tint/program_builder.h"
#include "src/tint/resolver/dependency_graph.h"
#include "src/tint/utils/map.h"
namespace tint::resolver {
/// Helper class to retrieve sem information.
class SemHelper {
public:
/// Constructor
/// @param builder the program builder
/// @param dependencies the program dependency graph
explicit SemHelper(ProgramBuilder* builder, DependencyGraph& dependencies);
~SemHelper();
/// Get is a helper for obtaining the semantic node for the given AST node.
/// @param ast the ast node to get the sem for
/// @returns the sem node for the provided |ast|
template <typename SEM = sem::Info::InferFromAST, typename AST_OR_TYPE = CastableBase>
auto* Get(const AST_OR_TYPE* ast) const {
using T = sem::Info::GetResultType<SEM, AST_OR_TYPE>;
auto* sem = builder_->Sem().Get(ast);
if (TINT_UNLIKELY(!sem)) {
TINT_ICE(Resolver, builder_->Diagnostics())
<< "AST node '" << ast->TypeInfo().name << "' had no semantic info\n"
<< "At: " << ast->source << "\n"
<< "Pointer: " << ast;
}
return const_cast<T*>(As<T>(sem));
}
/// @returns the resolved symbol (function, type or variable) for the given ast::Identifier or
/// ast::TypeName cast to the given semantic type.
/// @param node the node to retrieve
template <typename SEM = CastableBase>
SEM* ResolvedSymbol(const ast::Node* node) const {
auto resolved = dependencies_.resolved_symbols.Find(node);
return resolved ? const_cast<SEM*>(builder_->Sem().Get<SEM>(*resolved)) : nullptr;
}
/// @returns the resolved type of the ast::Expression `expr`
/// @param expr the expression
type::Type* TypeOf(const ast::Expression* expr) const;
/// @returns the type name of the given semantic type, unwrapping
/// references.
/// @param ty the type to look up
std::string TypeNameOf(const type::Type* ty) const;
/// @returns the type name of the given semantic type, without unwrapping
/// references.
/// @param ty the type to look up
std::string RawTypeNameOf(const type::Type* ty) const;
private:
ProgramBuilder* builder_;
DependencyGraph& dependencies_;
};
} // namespace tint::resolver
#endif // SRC_TINT_RESOLVER_SEM_HELPER_H_