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// Copyright 2023 The Dawn & Tint Authors
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#ifndef SRC_TINT_LANG_CORE_CONSTANT_MANAGER_H_
#define SRC_TINT_LANG_CORE_CONSTANT_MANAGER_H_
#include <utility>
#include "src/tint/lang/core/constant/value.h"
#include "src/tint/lang/core/number.h"
#include "src/tint/lang/core/type/manager.h"
#include "src/tint/utils/containers/unique_allocator.h"
#include "src/tint/utils/math/hash.h"
namespace tint::core::constant {
class Splat;
template <typename T>
class Scalar;
} // namespace tint::core::constant
namespace tint::core::constant {
/// The constant manager holds a type manager and all the pointers to the known constant values.
class Manager final {
public:
/// Iterator is the type returned by begin() and end()
using TypeIterator = BlockAllocator<Value>::ConstIterator;
/// Constructor
Manager();
/// Move constructor
Manager(Manager&&);
/// Move assignment operator
/// @param rhs the Manager to move
/// @return this Manager
Manager& operator=(Manager&& rhs);
/// Destructor
~Manager();
/// Wrap returns a new Manager created with the constants and types of `inner`.
/// The Manager returned by Wrap is intended to temporarily extend the constants and types of an
/// existing immutable Manager. As the copied constants and types are owned by `inner`, `inner`
/// must not be destructed or assigned while using the returned Manager.
/// TODO(bclayton) - Evaluate whether there are safer alternatives to this
/// function. See crbug.com/tint/460.
/// @param inner the immutable Manager to extend
/// @return the Manager that wraps `inner`
static Manager Wrap(const Manager& inner) {
Manager out;
out.values_.Wrap(inner.values_);
out.types = core::type::Manager::Wrap(inner.types);
return out;
}
/// @param args the arguments used to construct the type, unique node or node.
/// @return a pointer to an instance of `T` with the provided arguments.
/// If NODE derives from UniqueNode and an existing instance of `T` has been
/// constructed, then the same pointer is returned.
template <typename NODE, typename... ARGS>
NODE* Get(ARGS&&... args) {
return values_.Get<NODE>(std::forward<ARGS>(args)...);
}
/// @returns an iterator to the beginning of the types
TypeIterator begin() const { return values_.begin(); }
/// @returns an iterator to the end of the types
TypeIterator end() const { return values_.end(); }
/// Constructs a constant of a vector, matrix or array type.
///
/// Examines the element values and will return either a constant::Composite or a
/// constant::Splat, depending on the element types and values.
///
/// @param type the composite type
/// @param elements the composite elements
/// @returns the value pointer
const constant::Value* Composite(const core::type::Type* type,
VectorRef<const constant::Value*> elements);
/// Constructs a splat constant.
/// @param type the splat type
/// @param element the splat element
/// @param n the number of elements
/// @returns the value pointer
const constant::Splat* Splat(const core::type::Type* type,
const constant::Value* element,
size_t n);
/// @param value the constant value
/// @return a Scalar holding the i32 value @p value
const Scalar<i32>* Get(i32 value);
/// @param value the constant value
/// @return a Scalar holding the u32 value @p value
const Scalar<u32>* Get(u32 value);
/// @param value the constant value
/// @return a Scalar holding the f32 value @p value
const Scalar<f32>* Get(f32 value);
/// @param value the constant value
/// @return a Scalar holding the f16 value @p value
const Scalar<f16>* Get(f16 value);
/// @param value the constant value
/// @return a Scalar holding the bool value @p value
const Scalar<bool>* Get(bool value);
/// @param value the constant value
/// @return a Scalar holding the AFloat value @p value
const Scalar<AFloat>* Get(AFloat value);
/// @param value the constant value
/// @return a Scalar holding the AInt value @p value
const Scalar<AInt>* Get(AInt value);
/// Constructs a constant zero-value of the type @p type.
/// @param type the constant type
/// @returns a constant zero-value for the type
const Value* Zero(const core::type::Type* type);
/// The type manager
core::type::Manager types;
private:
/// A specialization of Hasher for constant::Value
struct Hasher {
/// @param value the value to hash
/// @returns a hash of the value
size_t operator()(const constant::Value& value) const { return value.Hash(); }
};
/// An equality helper for constant::Value
struct Equal {
/// @param a the LHS value
/// @param b the RHS value
/// @returns true if the two constants are equal
bool operator()(const constant::Value& a, const constant::Value& b) const {
return a.Equal(&b);
}
};
/// Unique types owned by the manager
UniqueAllocator<Value, Hasher, Equal> values_;
};
} // namespace tint::core::constant
#endif // SRC_TINT_LANG_CORE_CONSTANT_MANAGER_H_