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92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
//===--- Allocator.h - Simple memory allocation abstraction -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// 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 the MallocAllocator and BumpPtrAllocator interfaces.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ALLOCATOR_H
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#define LLVM_SUPPORT_ALLOCATOR_H
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#include "llvm/Support/AlignOf.h"
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#include <cstdlib>
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namespace llvm {
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class MallocAllocator {
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public:
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MallocAllocator() {}
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~MallocAllocator() {}
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void Reset() {}
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void *Allocate(size_t Size, size_t /*Alignment*/) { return malloc(Size); }
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template <typename T>
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T *Allocate() { return static_cast<T*>(malloc(sizeof(T))); }
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template <typename T>
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T *Allocate(size_t Num) {
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return static_cast<T*>(malloc(sizeof(T)*Num));
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}
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void Deallocate(const void *Ptr) { free(const_cast<void*>(Ptr)); }
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void PrintStats() const {}
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};
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/// BumpPtrAllocator - This allocator is useful for containers that need very
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/// simple memory allocation strategies. In particular, this just keeps
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/// allocating memory, and never deletes it until the entire block is dead. This
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/// makes allocation speedy, but must only be used when the trade-off is ok.
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class BumpPtrAllocator {
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BumpPtrAllocator(const BumpPtrAllocator &); // do not implement
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void operator=(const BumpPtrAllocator &); // do not implement
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void *TheMemory;
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public:
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BumpPtrAllocator();
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~BumpPtrAllocator();
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void Reset();
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void *Allocate(size_t Size, size_t Alignment);
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/// Allocate space, but do not construct, one object.
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///
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template <typename T>
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T *Allocate() {
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return static_cast<T*>(Allocate(sizeof(T),AlignOf<T>::Alignment));
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}
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/// Allocate space for an array of objects. This does not construct the
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/// objects though.
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template <typename T>
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T *Allocate(size_t Num) {
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return static_cast<T*>(Allocate(Num * sizeof(T), AlignOf<T>::Alignment));
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}
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/// Allocate space for a specific count of elements and with a specified
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/// alignment.
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template <typename T>
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T *Allocate(size_t Num, size_t Alignment) {
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// Round EltSize up to the specified alignment.
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size_t EltSize = (sizeof(T)+Alignment-1)&(-Alignment);
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return static_cast<T*>(Allocate(Num * EltSize, Alignment));
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}
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void Deallocate(const void * /*Ptr*/) {}
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void PrintStats() const;
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};
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} // end namespace llvm
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#endif
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