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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_ARRAY_H_
#define SRC_SEM_ARRAY_H_
#include <stdint.h>
#include <string>
#include "src/sem/node.h"
#include "src/sem/type.h"
// Forward declarations
namespace tint {
namespace ast {
class Array;
} // namespace ast
} // namespace tint
namespace tint {
namespace sem {
/// Array holds the semantic information for Array nodes.
class Array : public Castable<Array, Type> {
public:
/// Constructor
/// @param element the array element type
/// @param count the number of elements in the array. 0 represents a
/// runtime-sized array.
/// @param align the byte alignment of the array
/// @param size the byte size of the array
/// @param stride the number of bytes from the start of one element of the
/// array to the start of the next element
/// @param implicit_stride the number of bytes from the start of one element
/// of the array to the start of the next element, if there was no [[stride]]
/// decoration applied.
Array(Type const* element,
uint32_t count,
uint32_t align,
uint32_t size,
uint32_t stride,
uint32_t implicit_stride);
/// @return the array element type
Type const* ElemType() const { return element_; }
/// @returns the number of elements in the array. 0 represents a runtime-sized
/// array.
uint32_t Count() const { return count_; }
/// @returns the byte alignment of the array
/// @note this may differ from the alignment of a structure member of this
/// array type, if the member is annotated with the `[[align(n)]]` decoration.
uint32_t Align() const override;
/// @returns the byte size of the array
/// @note this may differ from the size of a structure member of this array
/// type, if the member is annotated with the `[[size(n)]]` decoration.
uint32_t Size() const override;
/// @returns the number of bytes from the start of one element of the
/// array to the start of the next element
uint32_t Stride() const { return stride_; }
/// @returns the number of bytes from the start of one element of the
/// array to the start of the next element, if there was no [[stride]]
/// decoration applied
uint32_t ImplicitStride() const { return implicit_stride_; }
/// @returns true if the value returned by Stride() matches the element's
/// natural stride
bool IsStrideImplicit() const { return stride_ == implicit_stride_; }
/// @returns true if this array is runtime sized
bool IsRuntimeSized() const { return count_ == 0; }
/// @returns true if constructible as per
/// https://gpuweb.github.io/gpuweb/wgsl/#constructible-types
bool IsConstructible() const override;
/// @returns the name for the type
std::string type_name() const override;
/// @param symbols the program's symbol table
/// @returns the name for this type that closely resembles how it would be
/// declared in WGSL.
std::string FriendlyName(const SymbolTable& symbols) const override;
private:
Type const* const element_;
const uint32_t count_;
const uint32_t align_;
const uint32_t size_;
const uint32_t stride_;
const uint32_t implicit_stride_;
const bool constructible_;
};
} // namespace sem
} // namespace tint
#endif // SRC_SEM_ARRAY_H_