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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_TYPE_TYPE_H_
#define SRC_TINT_TYPE_TYPE_H_
#include <functional>
#include <string>
#include "src/tint/type/node.h"
#include "src/tint/utils/enum_set.h"
#include "src/tint/utils/vector.h"
// Forward declarations
namespace tint {
class ProgramBuilder;
class SymbolTable;
} // namespace tint
namespace tint::type {
enum TypeFlag {
/// Type is constructable.
/// @see https://gpuweb.github.io/gpuweb/wgsl/#constructible-types
kConstructable,
/// Type has a creation-fixed footprint.
/// @see https://www.w3.org/TR/WGSL/#fixed-footprint-types
kCreationFixedFootprint,
/// Type has a fixed footprint.
/// @see https://www.w3.org/TR/WGSL/#fixed-footprint-types
kFixedFootprint,
};
/// An alias to utils::EnumSet<TypeFlag>
using TypeFlags = utils::EnumSet<TypeFlag>;
/// Base class for a type in the system
class Type : public Castable<Type, Node> {
public:
/// Alias to TypeFlag
using Flag = TypeFlag;
/// Move constructor
Type(Type&&);
~Type() override;
/// @returns a hash of the type.
virtual size_t Hash() const = 0;
/// @returns true if the this type is equal to the given type
virtual bool Equals(const Type&) const = 0;
/// @param symbols the program's symbol table
/// @returns the name for this type that closely resembles how it would be
/// declared in WGSL.
virtual std::string FriendlyName(const SymbolTable& symbols) const = 0;
/// @returns the inner most pointee type if this is a pointer, `this`
/// otherwise
const Type* UnwrapPtr() const;
/// @returns the inner type if this is a reference, `this` otherwise
const Type* UnwrapRef() const;
/// @returns the size in bytes of the type. This may include tail padding.
/// @note opaque types will return a size of 0.
virtual uint32_t Size() const;
/// @returns the alignment in bytes of the type. This may include tail
/// padding.
/// @note opaque types will return a size of 0.
virtual uint32_t Align() const;
/// @returns the flags on the type
TypeFlags Flags() { return flags_; }
/// @returns true if type is constructable
/// https://gpuweb.github.io/gpuweb/wgsl/#constructible-types
inline bool IsConstructible() const { return flags_.Contains(Flag::kConstructable); }
/// @returns true has a creation-fixed footprint.
/// @see https://www.w3.org/TR/WGSL/#fixed-footprint-types
inline bool HasCreationFixedFootprint() const {
return flags_.Contains(Flag::kCreationFixedFootprint);
}
/// @returns true has a fixed footprint.
/// @see https://www.w3.org/TR/WGSL/#fixed-footprint-types
inline bool HasFixedFootprint() const { return flags_.Contains(Flag::kFixedFootprint); }
/// @returns true if this type is a scalar
bool is_scalar() const;
/// @returns true if this type is a numeric scalar
bool is_numeric_scalar() const;
/// @returns true if this type is a float scalar
bool is_float_scalar() const;
/// @returns true if this type is a float matrix
bool is_float_matrix() const;
/// @returns true if this type is a square float matrix
bool is_square_float_matrix() const;
/// @returns true if this type is a float vector
bool is_float_vector() const;
/// @returns true if this type is a float scalar or vector
bool is_float_scalar_or_vector() const;
/// @returns true if this type is a float scalar or vector or matrix
bool is_float_scalar_or_vector_or_matrix() const;
/// @returns true if this type is an integer scalar
bool is_integer_scalar() const;
/// @returns true if this type is a signed integer scalar
bool is_signed_integer_scalar() const;
/// @returns true if this type is an unsigned integer scalar
bool is_unsigned_integer_scalar() const;
/// @returns true if this type is a signed integer vector
bool is_signed_integer_vector() const;
/// @returns true if this type is an unsigned vector
bool is_unsigned_integer_vector() const;
/// @returns true if this type is an unsigned scalar or vector
bool is_unsigned_integer_scalar_or_vector() const;
/// @returns true if this type is a signed scalar or vector
bool is_signed_integer_scalar_or_vector() const;
/// @returns true if this type is an integer scalar or vector
bool is_integer_scalar_or_vector() const;
/// @returns true if this type is an abstract integer vector
bool is_abstract_integer_vector() const;
/// @returns true if this type is an abstract float vector
bool is_abstract_float_vector() const;
/// @returns true if this type is an abstract integer scalar or vector
bool is_abstract_integer_scalar_or_vector() const;
/// @returns true if this type is an abstract float scalar or vector
bool is_abstract_float_scalar_or_vector() const;
/// @returns true if this type is a boolean vector
bool is_bool_vector() const;
/// @returns true if this type is boolean scalar or vector
bool is_bool_scalar_or_vector() const;
/// @returns true if this type is a numeric vector
bool is_numeric_vector() const;
/// @returns true if this type is a vector of scalar type
bool is_scalar_vector() const;
/// @returns true if this type is a numeric scale or vector
bool is_numeric_scalar_or_vector() const;
/// @returns true if this type is a handle type
bool is_handle() const;
/// @returns true if this type is an abstract-numeric or if the type holds an element that is an
/// abstract-numeric.
bool HoldsAbstract() const;
/// kNoConversion is returned from ConversionRank() when the implicit conversion is not
/// permitted.
static constexpr uint32_t kNoConversion = 0xffffffffu;
/// ConversionRank returns the implicit conversion rank when attempting to convert `from` to
/// `to`. Lower ranks are preferred over higher ranks.
/// @param from the source type
/// @param to the destination type
/// @returns the rank value for converting from type `from` to type `to`, or #kNoConversion if
/// the implicit conversion is not allowed.
/// @see https://www.w3.org/TR/WGSL/#conversion-rank
static uint32_t ConversionRank(const Type* from, const Type* to);
/// @param ty the type to obtain the element type from
/// @param count if not null, then this is assigned the number of child elements in the type.
/// For example, the count of an `array<vec3<f32>, 5>` type would be 5.
/// @returns
/// * the element type if `ty` is a vector or array
/// * the column type if `ty` is a matrix
/// * `ty` if `ty` is none of the above
static const Type* ElementOf(const Type* ty, uint32_t* count = nullptr);
/// @param ty the type to obtain the deepest element type from
/// @param count if not null, then this is assigned the full number of most deeply nested
/// elements in the type. For example, the count of an `array<vec3<f32>, 5>` type would be 15.
/// @returns
/// * the element type if `ty` is a vector
/// * the matrix element type if `ty` is a matrix
/// * the deepest element type if `ty` is an array
/// * `ty` if `ty` is none of the above
static const Type* DeepestElementOf(const Type* ty, uint32_t* count = nullptr);
/// @param types the list of types
/// @returns the lowest-ranking type that all types in `types` can be implicitly converted to,
/// or nullptr if there is no consistent common type across all types in `types`.
/// @see https://www.w3.org/TR/WGSL/#conversion-rank
static const Type* Common(utils::VectorRef<const Type*> types);
protected:
/// Constructor
/// @param flags the flags of this type
explicit Type(TypeFlags flags);
/// The flags of this type.
const TypeFlags flags_;
};
} // namespace tint::type
namespace std {
/// std::hash specialization for tint::type::Type
template <>
struct hash<tint::type::Type> {
/// @param type the type to obtain a hash from
/// @returns the hash of the type
size_t operator()(const tint::type::Type& type) const { return type.Hash(); }
};
/// std::equal_to specialization for tint::type::Type
template <>
struct equal_to<tint::type::Type> {
/// @param a the first type to compare
/// @param b the second type to compare
/// @returns true if the two types are equal
bool operator()(const tint::type::Type& a, const tint::type::Type& b) const {
return a.Equals(b);
}
};
} // namespace std
#endif // SRC_TINT_TYPE_TYPE_H_