607 lines
20 KiB
C++
607 lines
20 KiB
C++
/* metaprogramming.h -*- C++ -*-
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*
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* @copyright
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* Copyright (C) 2012-2013, Intel Corporation
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* All rights reserved.
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*
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* @copyright
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* @copyright
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @file metaprogramming.h
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*
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* @brief Defines metaprogramming utility classes used in the Cilk library.
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*
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* @ingroup common
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*/
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#ifndef METAPROGRAMMING_H_INCLUDED
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#define METAPROGRAMMING_H_INCLUDED
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#ifdef __cplusplus
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#include <functional>
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#include <new>
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#include <cstdlib>
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#ifdef _WIN32
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#include <malloc.h>
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#endif
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#include <algorithm>
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namespace cilk {
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namespace internal {
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/** Test if a class is empty.
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*
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* If @a Class is an empty (and therefore necessarily stateless) class, then
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* the “empty base-class optimization” guarantees that
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* `sizeof(check_for_empty_class<Class>) == sizeof(char)`. Conversely, if
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* `sizeof(check_for_empty_class<Class>) > sizeof(char)`, then @a Class is not
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* empty, and we must discriminate distinct instances of @a Class.
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*
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* Typical usage:
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*
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* // General definition of A<B> for non-empty B:
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* template <typename B, bool BIsEmpty = class_is_empty<B>::value> >
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* class A { ... };
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*
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* // Specialized definition of A<B> for empty B:
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* template <typename B>
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* class A<B, true> { ... };
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*
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* @tparam Class The class to be tested for emptiness.
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*
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* @result The `value` member will be `true` if @a Class is empty,
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* `false` otherwise.
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*
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* @ingroup common
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*/
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template <class Class>
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class class_is_empty {
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class check_for_empty_class : public Class
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{
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char m_data;
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public:
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// Declared but not defined
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check_for_empty_class();
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check_for_empty_class(const check_for_empty_class&);
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check_for_empty_class& operator=(const check_for_empty_class&);
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~check_for_empty_class();
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};
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public:
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/** Constant is true if and only if @a Class is empty.
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*/
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static const bool value = (sizeof(check_for_empty_class) == sizeof(char));
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};
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/** Get the alignment of a type.
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*
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* For example:
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*
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* align_of<double>::value == 8
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*
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* @tparam Tp The type whose alignment is to be computed.
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*
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* @result The `value` member of an instantiation of this class template
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* will hold the integral alignment requirement of @a Tp.
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*
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* @pre @a Tp shall be a complete type.
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*
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* @ingroup common
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*/
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template <typename Tp>
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struct align_of
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{
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private:
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struct imp {
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char m_padding;
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Tp m_val;
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// The following declarations exist to suppress compiler-generated
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// definitions, in case @a Tp does not have a public default
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// constructor, copy constructor, or destructor.
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imp(const imp&); // Declared but not defined
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~imp(); // Declared but not defined
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};
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public:
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/// The integral alignment requirement of @a Tp.
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static const std::size_t value = (sizeof(imp) - sizeof(Tp));
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};
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/** A class containing raw bytes with a specified alignment and size.
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*
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* An object of type `aligned_storage<S, A>` will have alignment `A` and
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* size at least `S`. Its contents will be uninitialized bytes.
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*
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* @tparam Size The required minimum size of the resulting class.
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* @tparam Alignment The required alignment of the resulting class.
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*
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* @pre @a Alignment shall be a power of 2 no greater then 64.
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*
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* @note This is implemented using the `CILK_ALIGNAS` macro, which uses
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* the non-standard, implementation-specific features
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* `__declspec(align(N))` on Windows, and
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* `__attribute__((__aligned__(N)))` on Unix. The `gcc` implementation
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* of `__attribute__((__aligned__(N)))` requires a numeric literal `N`
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* (_not_ an arbitrary compile-time constant expression). Therefore,
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* this class is implemented using specialization on the required
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* alignment.
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*
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* @note The template class is specialized only for the supported
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* alignments. An attempt to instantiate it for an unsupported
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* alignment will result in a compilation error.
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*/
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template <std::size_t Size, std::size_t Alignment>
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struct aligned_storage;
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template<std::size_t Size> class aligned_storage<Size, 1>
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{ CILK_ALIGNAS( 1) char m_bytes[Size]; };
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template<std::size_t Size> class aligned_storage<Size, 2>
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{ CILK_ALIGNAS( 2) char m_bytes[Size]; };
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template<std::size_t Size> class aligned_storage<Size, 4>
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{ CILK_ALIGNAS( 4) char m_bytes[Size]; };
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template<std::size_t Size> class aligned_storage<Size, 8>
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{ CILK_ALIGNAS( 8) char m_bytes[Size]; };
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template<std::size_t Size> class aligned_storage<Size, 16>
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{ CILK_ALIGNAS(16) char m_bytes[Size]; };
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template<std::size_t Size> class aligned_storage<Size, 32>
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{ CILK_ALIGNAS(32) char m_bytes[Size]; };
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template<std::size_t Size> class aligned_storage<Size, 64>
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{ CILK_ALIGNAS(64) char m_bytes[Size]; };
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/** A buffer of uninitialized bytes with the same size and alignment as a
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* specified type.
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*
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* The class `storage_for_object<Type>` will have the same size and alignment
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* properties as `Type`, but it will contain only raw (uninitialized) bytes.
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* This allows the definition of a data member which can contain a `Type`
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* object which is initialized explicitly under program control, rather
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* than implicitly as part of the initialization of the containing class.
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* For example:
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*
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* class C {
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* storage_for_object<MemberClass> _member;
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* public:
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* C() ... // Does NOT initialize _member
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* void initialize(args)
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* { new (_member.pointer()) MemberClass(args); }
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* const MemberClass& member() const { return _member.object(); }
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* MemberClass& member() { return _member.object(); }
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*
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* @tparam Type The type whose size and alignment are to be reflected
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* by this class.
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*/
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template <typename Type>
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class storage_for_object :
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aligned_storage< sizeof(Type), align_of<Type>::value >
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{
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public:
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/// Return a typed reference to the buffer.
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const Type& object() const { return *reinterpret_cast<Type*>(this); }
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Type& object() { return *reinterpret_cast<Type*>(this); }
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};
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/** Get the functor class corresponding to a binary function type.
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*
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* The `binary_functor` template class class can be instantiated with a binary
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* functor class or with a real binary function, and will yield an equivalent
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* binary functor class class in either case.
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*
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* @tparam F A binary functor class, a binary function type, or a pointer to
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* binary function type.
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*
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* @result `binary_functor<F>::%type` will be the same as @a F if @a F is
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* a class. It will be a `std::pointer_to_binary_function` wrapper
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* if @a F is a binary function or binary function pointer type.
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* (It will _not_ necessarily be an `Adaptable Binary Function`
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* class, since @a F might be a non-adaptable binary functor
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* class.)
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*
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* @ingroup common
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*/
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template <typename F>
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struct binary_functor {
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/// The binary functor class equivalent to @a F.
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typedef F type;
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};
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/// @copydoc binary_functor
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/// Specialization for binary function.
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template <typename R, typename A, typename B>
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struct binary_functor<R(A,B)> {
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/// The binary functor class equivalent to @a F.
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typedef std::pointer_to_binary_function<A, B, R> type;
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};
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/// @copydoc binary_functor
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/// Specialization for pointer to binary function.
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template <typename R, typename A, typename B>
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struct binary_functor<R(*)(A,B)> {
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/// The binary functor class equivalent to @a F.
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typedef std::pointer_to_binary_function<A, B, R> type;
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};
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/** Indirect binary function class with specified types.
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*
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* `typed_indirect_binary_function<F>` is an `Adaptable Binary Function` class
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* based on an existing binary functor class or binary function type @a F. If
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* @a F is a stateless class, then this class will be empty, and its
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* `operator()` will invoke @a F’s `operator()`. Otherwise, an object of this
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* class will hold a pointer to an object of type @a F, and will refer its
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* `operator()` calls to the pointed-to @a F object.
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*
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* That is, suppose that we have the declarations:
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*
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* F *p;
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* typed_indirect_binary_function<F, int, int, bool> ibf(p);
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*
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* Then:
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*
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* - `ibf(x, y) == (*p)(x, y)`.
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* - `ibf(x, y)` will not do a pointer dereference if `F` is an empty class.
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*
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* @note Just to repeat: if `F` is an empty class, then
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* `typed_indirect_binary_function\<F\>' is also an empty class.
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* This is critical for its use in the @ref min_max::view_base
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* "min/max reducer view classes", where it allows the view to
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* call a comparison functor in the monoid without actually
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* having to allocate a pointer in the view class when the
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* comparison class is empty.
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*
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* @note If you have an `Adaptable Binary Function` class or a binary
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* function type, then you can use the
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* @ref indirect_binary_function class, which derives the
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* argument and result types parameter type instead of requiring
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* you to specify them as template arguments.
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*
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* @tparam F A binary functor class, a binary function type, or a pointer to
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* binary function type.
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* @param A1 The first argument type.
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* @param A2 The second argument type.
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* @param R The result type.
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*
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* @see min_max::comparator_base
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* @see indirect_binary_function
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*
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* @ingroup common
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*/
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template < typename F
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, typename A1
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, typename A2
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, typename R
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, typename Functor = typename binary_functor<F>::type
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, bool FunctorIsEmpty = class_is_empty<Functor>::value
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>
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class typed_indirect_binary_function : std::binary_function<A1, A2, R>
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{
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const F* f;
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public:
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/// Constructor captures a pointer to the wrapped function.
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typed_indirect_binary_function(const F* f) : f(f) {}
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/// Return the comparator pointer, or `NULL` if the comparator is stateless.
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const F* pointer() const { return f; }
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/// Apply the pointed-to functor to the arguments.
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R operator()(const A1& a1, const A2& a2) const { return (*f)(a1, a2); }
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};
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/// @copydoc typed_indirect_binary_function
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/// Specialization for an empty functor class. (This is only possible if @a F
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/// itself is an empty class. If @a F is a function or pointer-to-function
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/// type, then the functor will contain a pointer.)
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template <typename F, typename A1, typename A2, typename R, typename Functor>
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class typed_indirect_binary_function<F, A1, A2, R, Functor, true> :
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std::binary_function<A1, A2, R>
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{
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public:
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/// Return `NULL` for the comparator pointer of a stateless comparator.
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const F* pointer() const { return 0; }
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/// Constructor discards the pointer to a stateless functor class.
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typed_indirect_binary_function(const F* f) {}
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/// Create an instance of the stateless functor class and apply it to the arguments.
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R operator()(const A1& a1, const A2& a2) const { return F()(a1, a2); }
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};
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/** Indirect binary function class with inferred types.
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*
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* This is identical to @ref typed_indirect_binary_function, except that it
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* derives the binary function argument and result types from the parameter
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* type @a F instead of taking them as additional template parameters. If @a F
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* is a class type, then it must be an `Adaptable Binary Function`.
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*
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* @see typed_indirect_binary_function
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*
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* @ingroup common
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*/
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template <typename F, typename Functor = typename binary_functor<F>::type>
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class indirect_binary_function :
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typed_indirect_binary_function< F
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, typename Functor::first_argument_type
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, typename Functor::second_argument_type
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, typename Functor::result_type
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>
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{
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typedef typed_indirect_binary_function< F
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, typename Functor::first_argument_type
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, typename Functor::second_argument_type
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, typename Functor::result_type
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>
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base;
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public:
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indirect_binary_function(const F* f) : base(f) {} ///< Constructor
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};
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/** Choose a type based on a boolean constant.
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*
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* This metafunction is identical to C++11’s condition metafunction.
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* It needs to be here until we can reasonably assume that users will be
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* compiling with C++11.
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*
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* @tparam Cond A boolean constant.
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* @tparam IfTrue A type.
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* @tparam IfFalse A type.
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* @result The `type` member will be a typedef of @a IfTrue if @a Cond
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* is true, and a typedef of @a IfFalse if @a Cond is false.
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*
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* @ingroup common
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*/
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template <bool Cond, typename IfTrue, typename IfFalse>
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struct condition
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{
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typedef IfTrue type; ///< The type selected by the condition.
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};
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/// @copydoc condition
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/// Specialization for @a Cond == `false`.
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template <typename IfTrue, typename IfFalse>
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struct condition<false, IfTrue, IfFalse>
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{
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typedef IfFalse type; ///< The type selected by the condition.
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};
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/** @def __CILKRTS_STATIC_ASSERT
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*
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* @brief Compile-time assertion.
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*
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* Causes a compilation error if a compile-time constant expression is false.
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*
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* @par Usage example.
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* This assertion is used in reducer_min_max.h to avoid defining
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* legacy reducer classes that would not be binary-compatible with the
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* same classes compiled with earlier versions of the reducer library.
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*
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* __CILKRTS_STATIC_ASSERT(
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* internal::class_is_empty< internal::binary_functor<Compare> >::value,
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* "cilk::reducer_max<Value, Compare> only works with an empty Compare class");
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*
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* @note In a C++11 compiler, this is just the language predefined
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* `static_assert` macro.
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*
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* @note In a non-C++11 compiler, the @a Msg string is not directly included
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* in the compiler error message, but it may appear if the compiler
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* prints the source line that the error occurred on.
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*
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* @param Cond The expression to test.
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* @param Msg A string explaining the failure.
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*
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* @ingroup common
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*/
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#if defined(__INTEL_CXX11_MODE__) || defined(__GXX_EXPERIMENTAL_CXX0X__)
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# define __CILKRTS_STATIC_ASSERT(Cond, Msg) static_assert(Cond, Msg)
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#else
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# define __CILKRTS_STATIC_ASSERT(Cond, Msg) \
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typedef int __CILKRTS_STATIC_ASSERT_DUMMY_TYPE \
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[::cilk::internal::static_assert_failure<(Cond)>::Success]
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/// @cond internal
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template <bool> struct static_assert_failure { };
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template <> struct static_assert_failure<true> { enum { Success = 1 }; };
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# define __CILKRTS_STATIC_ASSERT_DUMMY_TYPE \
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__CILKRTS_STATIC_ASSERT_DUMMY_TYPE1(__cilkrts_static_assert_, __LINE__)
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# define __CILKRTS_STATIC_ASSERT_DUMMY_TYPE1(a, b) \
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__CILKRTS_STATIC_ASSERT_DUMMY_TYPE2(a, b)
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# define __CILKRTS_STATIC_ASSERT_DUMMY_TYPE2(a, b) a ## b
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/// @endcond
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#endif
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/// @cond internal
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/** @name Aligned heap management.
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*/
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//@{
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/** Implementation-specific aligned memory allocation function.
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*
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* @param size The minimum number of bytes to allocate.
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* @param alignment The required alignment (must be a power of 2).
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* @return The address of a block of memory of at least @a size
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* bytes. The address will be a multiple of @a alignment.
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* `NULL` if the allocation fails.
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*
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* @see deallocate_aligned()
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*/
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inline void* allocate_aligned(std::size_t size, std::size_t alignment)
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{
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#ifdef _WIN32
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return _aligned_malloc(size, alignment);
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#else
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#if defined(__ANDROID__)
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return memalign(std::max(alignment, sizeof(void*)), size);
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#else
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void* ptr;
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return (posix_memalign(&ptr, std::max(alignment, sizeof(void*)), size) == 0) ? ptr : 0;
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#endif
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#endif
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}
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/** Implementation-specific aligned memory deallocation function.
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*
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* @param ptr A pointer which was returned by a call to alloc_aligned().
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*/
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inline void deallocate_aligned(void* ptr)
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{
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#ifdef _WIN32
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_aligned_free(ptr);
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#else
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std::free(ptr);
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#endif
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}
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/** Class to allocate and guard an aligned pointer.
|
||
*
|
||
* A new_aligned_pointer object allocates aligned heap-allocated memory when
|
||
* it is created, and automatically deallocates it when it is destroyed
|
||
* unless its `ok()` function is called.
|
||
*
|
||
* @tparam T The type of the object to allocate on the heap. The allocated
|
||
* will have the size and alignment of an object of type T.
|
||
*/
|
||
template <typename T>
|
||
class new_aligned_pointer {
|
||
void* m_ptr;
|
||
public:
|
||
/// Constructor allocates the pointer.
|
||
new_aligned_pointer() :
|
||
m_ptr(allocate_aligned(sizeof(T), internal::align_of<T>::value)) {}
|
||
/// Destructor deallocates the pointer.
|
||
~new_aligned_pointer() { if (m_ptr) deallocate_aligned(m_ptr); }
|
||
/// Get the pointer.
|
||
operator void*() { return m_ptr; }
|
||
/// Return the pointer and release the guard.
|
||
T* ok() {
|
||
T* ptr = static_cast<T*>(m_ptr);
|
||
m_ptr = 0;
|
||
return ptr;
|
||
}
|
||
};
|
||
|
||
//@}
|
||
|
||
/// @endcond
|
||
|
||
} // namespace internal
|
||
|
||
//@{
|
||
|
||
/** Allocate an aligned data structure on the heap.
|
||
*
|
||
* `cilk::aligned_new<T>([args])` is equivalent to `new T([args])`, except
|
||
* that it guarantees that the returned pointer will be at least as aligned
|
||
* as the alignment requirements of type `T`.
|
||
*
|
||
* @ingroup common
|
||
*/
|
||
template <typename T>
|
||
T* aligned_new()
|
||
{
|
||
internal::new_aligned_pointer<T> ptr;
|
||
new (ptr) T();
|
||
return ptr.ok();
|
||
}
|
||
|
||
template <typename T, typename T1>
|
||
T* aligned_new(const T1& x1)
|
||
{
|
||
internal::new_aligned_pointer<T> ptr;
|
||
new (ptr) T(x1);
|
||
return ptr.ok();
|
||
}
|
||
|
||
template <typename T, typename T1, typename T2>
|
||
T* aligned_new(const T1& x1, const T2& x2)
|
||
{
|
||
internal::new_aligned_pointer<T> ptr;
|
||
new (ptr) T(x1, x2);
|
||
return ptr.ok();
|
||
}
|
||
|
||
template <typename T, typename T1, typename T2, typename T3>
|
||
T* aligned_new(const T1& x1, const T2& x2, const T3& x3)
|
||
{
|
||
internal::new_aligned_pointer<T> ptr;
|
||
new (ptr) T(x1, x2, x3);
|
||
return ptr.ok();
|
||
}
|
||
|
||
template <typename T, typename T1, typename T2, typename T3, typename T4>
|
||
T* aligned_new(const T1& x1, const T2& x2, const T3& x3, const T4& x4)
|
||
{
|
||
internal::new_aligned_pointer<T> ptr;
|
||
new (ptr) T(x1, x2, x3, x4);
|
||
return ptr.ok();
|
||
}
|
||
|
||
template <typename T, typename T1, typename T2, typename T3, typename T4, typename T5>
|
||
T* aligned_new(const T1& x1, const T2& x2, const T3& x3, const T4& x4, const T5& x5)
|
||
{
|
||
internal::new_aligned_pointer<T> ptr;
|
||
new (ptr) T(x1, x2, x3, x4, x5);
|
||
return ptr.ok();
|
||
}
|
||
|
||
//@}
|
||
|
||
|
||
/** Deallocate an aligned data structure on the heap.
|
||
*
|
||
* `cilk::aligned_delete(ptr)` is equivalent to `delete ptr`, except that it
|
||
* operates on a pointer that was allocated by aligned_new().
|
||
*
|
||
* @ingroup common
|
||
*/
|
||
template <typename T>
|
||
void aligned_delete(const T* ptr)
|
||
{
|
||
ptr->~T();
|
||
internal::deallocate_aligned((void*)ptr);
|
||
}
|
||
|
||
} // namespace cilk
|
||
|
||
#endif // __cplusplus
|
||
|
||
#endif // METAPROGRAMMING_H_INCLUDED
|