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86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
//===-- Support/MallocAllocator.h - Allocator using malloc/free -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines MallocAllocator class, an STL compatible allocator which
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// just uses malloc/free to get and release memory. The default allocator uses
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// the STL pool allocator runtime library, this explicitly avoids it.
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//
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// This file is used for variety of purposes, including the pool allocator
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// project and testing, regardless of whether or not it's used directly in the
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// LLVM code, so don't delete this from CVS if you think it's unused!
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_MALLOCALLOCATOR_H
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#define SUPPORT_MALLOCALLOCATOR_H
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#include <cstdlib>
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#include <memory>
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namespace llvm {
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template<typename T>
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struct MallocAllocator {
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T value_type;
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template <class U> struct rebind {
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typedef MallocAllocator<U> other;
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};
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template<typename R>
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MallocAllocator(const MallocAllocator<R> &) {}
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MallocAllocator() {}
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pointer address(reference x) const { return &x; }
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const_pointer address(const_reference x) const { return &x; }
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size_type max_size() const { return ~0 / sizeof(T); }
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static pointer allocate(size_t n, void* hint = 0) {
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return static_cast<pointer>(malloc(n*sizeof(T)));
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}
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static void deallocate(pointer p, size_t n) {
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free(static_cast<void*>(p));
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}
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void construct(pointer p, const T &val) {
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new(static_cast<void*>(p)) T(val);
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}
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void destroy(pointer p) {
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p->~T();
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}
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};
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template<typename T>
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inline bool operator==(const MallocAllocator<T> &, const MallocAllocator<T> &) {
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return true;
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}
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template<typename T>
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inline bool operator!=(const MallocAllocator<T>&, const MallocAllocator<T>&) {
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return false;
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}
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} // End llvm namespace
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namespace std {
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template<typename Type, typename Type2>
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struct _Alloc_traits<Type, ::llvm::MallocAllocator<Type2> > {
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static const bool _S_instanceless = true;
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typedef ::llvm::MallocAllocator<Type> base_alloc_type;
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typedef ::llvm::MallocAllocator<Type> _Alloc_type;
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typedef ::llvm::MallocAllocator<Type> allocator_type;
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};
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}
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#endif
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