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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_TINT_LANG_WGSL_SEM_CALL_TARGET_H_
#define SRC_TINT_LANG_WGSL_SEM_CALL_TARGET_H_
#include <vector>
#include "src/tint/lang/core/type/sampler.h"
#include "src/tint/lang/wgsl/sem/node.h"
#include "src/tint/lang/wgsl/sem/variable.h"
#include "src/tint/utils/containers/vector.h"
#include "src/tint/utils/math/hash.h"
namespace tint::sem {
/// CallTargetSignature holds the return type and parameters for a call target
struct CallTargetSignature {
/// Constructor
CallTargetSignature();
/// Constructor
/// @param ret_ty the call target return type
/// @param params the call target parameters
CallTargetSignature(const core::type::Type* ret_ty, VectorRef<const Parameter*> params);
/// Copy constructor
CallTargetSignature(const CallTargetSignature&);
/// Destructor
~CallTargetSignature();
/// The type of the call target return value
const core::type::Type* return_type = nullptr;
/// The parameters of the call target
tint::Vector<const sem::Parameter*, 8> 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(core::ParameterUsage usage) const;
/// @param usage the parameter usage to find
/// @returns the the parameter with the given usage, or nullptr if no parameter with the given
/// usage exists.
inline const sem::Parameter* Parameter(core::ParameterUsage usage) const {
auto idx = IndexOf(usage);
return (idx >= 0) ? parameters[static_cast<size_t>(idx)] : nullptr;
}
};
/// CallTarget is the base for callable functions, builtins, value constructors and value
/// conversions.
class CallTarget : public Castable<CallTarget, Node> {
public:
/// Constructor
/// @param stage the earliest evaluation stage for a call to this target
/// @param must_use the result of the call target must be used, i.e. it cannot be used as a call
/// statement.
CallTarget(core::EvaluationStage stage, bool must_use);
/// Constructor
/// @param return_type the return type of the call target
/// @param parameters the parameters for the call target
/// @param stage the earliest evaluation stage for a call to this target
/// @param must_use the result of the call target must be used, i.e. it cannot be used as a call
/// statement.
CallTarget(const core::type::Type* return_type,
VectorRef<Parameter*> parameters,
core::EvaluationStage stage,
bool must_use);
/// Copy constructor
CallTarget(const CallTarget&);
/// Destructor
~CallTarget() override;
/// Sets the call target's return type
/// @param ty the parameter
void SetReturnType(const core::type::Type* ty) { signature_.return_type = ty; }
/// @return the return type of the call target
const core::type::Type* ReturnType() const { return signature_.return_type; }
/// Adds a parameter to the call target
/// @param parameter the parameter
void AddParameter(Parameter* parameter) {
parameter->SetOwner(this);
signature_.parameters.Push(parameter);
}
/// @return the parameters of the call target
auto& Parameters() const { return signature_.parameters; }
/// @return the signature of the call target
const CallTargetSignature& Signature() const { return signature_; }
/// @return the earliest evaluation stage for a call to this target
core::EvaluationStage Stage() const { return stage_; }
/// @returns true if the result of the call target must be used, i.e. it cannot be used as a
/// call statement.
bool MustUse() const { return must_use_; }
private:
CallTargetSignature signature_;
core::EvaluationStage stage_;
const bool must_use_;
};
} // namespace tint::sem
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_TINT_LANG_WGSL_SEM_CALL_TARGET_H_