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// Copyright 2021 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_SEM_CALL_TARGET_H_
#define SRC_SEM_CALL_TARGET_H_
#include <vector>
#include "src/sem/node.h"
#include "src/sem/sampler_type.h"
#include "src/sem/variable.h"
#include "src/utils/hash.h"
namespace tint {
namespace sem {
// Forward declarations
class Type;
/// CallTargetSignature holds the return type and parameters for a call target
struct CallTargetSignature {
/// Constructor
/// @param ret_ty the call target return type
/// @param params the call target parameters
CallTargetSignature(const sem::Type* ret_ty, const ParameterList& params);
/// Copy constructor
CallTargetSignature(const CallTargetSignature&);
/// Destructor
~CallTargetSignature();
/// The type of the call target return value
const sem::Type* const return_type = nullptr;
/// The parameters of the call target
const ParameterList parameters;
/// Equality operator
/// @param other the signature to compare this to
/// @returns true if this signature is equal to other
bool operator==(const CallTargetSignature& other) const;
/// @param usage the parameter usage to find
/// @returns the index of the parameter with the given usage, or -1 if no
/// parameter with the given usage exists.
int IndexOf(ParameterUsage usage) const;
};
/// CallTarget is the base for callable functions
class CallTarget : public Castable<CallTarget, Node> {
public:
/// Constructor
/// @param return_type the return type of the call target
/// @param parameters the parameters for the call target
CallTarget(const sem::Type* return_type, const ParameterList& parameters);
/// Copy constructor
CallTarget(const CallTarget&);
/// Destructor
~CallTarget() override;
/// @return the return type of the call target
const sem::Type* ReturnType() const { return signature_.return_type; }
/// @return the parameters of the call target
const ParameterList& Parameters() const { return signature_.parameters; }
/// @return the signature of the call target
const CallTargetSignature& Signature() const { return signature_; }
private:
CallTargetSignature signature_;
};
} // namespace sem
} // namespace tint
namespace std {
/// Custom std::hash specialization for tint::sem::CallTargetSignature so
/// CallTargetSignature can be used as keys for std::unordered_map and
/// std::unordered_set.
template <>
class hash<tint::sem::CallTargetSignature> {
public:
/// @param sig the CallTargetSignature to hash
/// @return the hash value
std::size_t operator()(const tint::sem::CallTargetSignature& sig) const;
};
} // namespace std
#endif // SRC_SEM_CALL_TARGET_H_