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/*
* Copyright 2011-2016 Blender Foundation
*
* 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 __UTIL_STACK_ALLOCATOR_H__
#define __UTIL_STACK_ALLOCATOR_H__
#include <cstddef>
#include <memory>
CCL_NAMESPACE_BEGIN
/* Stack allocator for the use with STL. */
template <int SIZE, typename T>
class ccl_try_align(16) StackAllocator {
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T *pointer;
typedef const T *const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef T value_type;
/* Allocator construction/destruction. */
StackAllocator()
: pointer_(0),
use_stack_(true) {}
StackAllocator(const StackAllocator&)
: pointer_(0),
use_stack_(true) {}
template <class U>
StackAllocator(const StackAllocator<SIZE, U>&)
: pointer_(0),
use_stack_(false) {}
/* Memory allocation/deallocation. */
T *allocate(size_t n, const void *hint = 0)
{
(void) hint;
if(n == 0) {
return NULL;
}
if(pointer_ + n >= SIZE || use_stack_ == false) {
size_t size = n * sizeof(T);
util_guarded_mem_alloc(size);
T *mem;
#ifdef WITH_BLENDER_GUARDEDALLOC
mem = (T*)MEM_mallocN_aligned(size, 16, "Cycles Alloc");
#else
mem = (T*)malloc(size);
#endif
if(mem == NULL) {
throw std::bad_alloc();
}
return mem;
}
T *mem = &data_[pointer_];
pointer_ += n;
return mem;
}
void deallocate(T *p, size_t n)
{
if(p == NULL) {
return;
}
if(p < data_ || p >= data_ + SIZE) {
util_guarded_mem_free(n * sizeof(T));
#ifdef WITH_BLENDER_GUARDEDALLOC
MEM_freeN(p);
#else
free(p);
#endif
return;
}
/* We don't support memory free for the stack allocator. */
}
/* Address of an reference. */
T *address(T& x) const
{
return &x;
}
const T *address(const T& x) const
{
return &x;
}
/* Object construction/destruction. */
void construct(T *p, const T& val)
{
if(p != NULL) {
new ((T *)p) T(val);
}
}
void destroy(T *p)
{
p->~T();
}
/* Maximum allocation size. */
size_t max_size() const
{
return size_t(-1);
}
/* Rebind to other ype of allocator. */
template <class U>
struct rebind {
typedef StackAllocator<SIZE, U> other;
};
/* Operators */
template <class U>
inline StackAllocator& operator=(const StackAllocator<SIZE, U>&)
{
return *this;
}
StackAllocator<SIZE, T>& operator=(const StackAllocator&)
{
return *this;
}
inline bool operator==(StackAllocator const& /*other*/) const
{
return true;
}
inline bool operator!=(StackAllocator const& other) const
{
return !operator==(other);
}
private:
int pointer_;
bool use_stack_;
T data_[SIZE];
};
CCL_NAMESPACE_END
#endif /* __UTIL_STACK_ALLOCATOR_H__ */
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