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/*
* Copyright 2011-2015 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_GUARDED_ALLOCATOR_H__
#define __UTIL_GUARDED_ALLOCATOR_H__
#include <cstddef>
#include <memory>
#ifdef WITH_BLENDER_GUARDEDALLOC
# include "../../guardedalloc/MEM_guardedalloc.h"
#endif
CCL_NAMESPACE_BEGIN
/* Internal use only. */
void util_guarded_mem_alloc(size_t n);
void util_guarded_mem_free(size_t n);
/* Guarded allocator for the use with STL. */
template <typename T>
class GuardedAllocator {
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;
GuardedAllocator() {}
GuardedAllocator(const GuardedAllocator&) {}
T *allocate(size_t n, const void *hint = 0)
{
(void)hint;
size_t size = n * sizeof(T);
util_guarded_mem_alloc(size);
if(n == 0) {
return NULL;
}
T *mem;
#ifdef WITH_BLENDER_GUARDEDALLOC
/* C++ standard requires allocation functions to allocate memory suitably
* aligned for any standard type. This is 16 bytes for 64 bit platform as
* far as i concerned. We might over-align on 32bit here, but that should
* be all safe actually.
*/
mem = (T*)MEM_mallocN_aligned(size, 16, "Cycles Alloc");
#else
mem = (T*)malloc(size);
#endif
if(mem == NULL) {
throw std::bad_alloc();
}
return mem;
}
void deallocate(T *p, size_t n)
{
util_guarded_mem_free(n * sizeof(T));
if(p != NULL) {
#ifdef WITH_BLENDER_GUARDEDALLOC
MEM_freeN(p);
#else
free(p);
#endif
}
}
T *address(T& x) const
{
return &x;
}
const T *address(const T& x) const
{
return &x;
}
GuardedAllocator<T>& operator=(const GuardedAllocator&)
{
return *this;
}
void construct(T *p, const T& val)
{
if(p != NULL) {
new ((T *)p) T(val);
}
}
void destroy(T *p)
{
p->~T();
}
size_t max_size() const
{
return size_t(-1);
}
template <class U>
struct rebind {
typedef GuardedAllocator<U> other;
};
template <class U>
GuardedAllocator(const GuardedAllocator<U>&) {}
template <class U>
GuardedAllocator& operator=(const GuardedAllocator<U>&) { return *this; }
inline bool operator==(GuardedAllocator const& /*other*/) const { return true; }
inline bool operator!=(GuardedAllocator const& other) const { return !operator==(other); }
#ifdef _MSC_VER
/* Welcome to the black magic here.
*
* The issue is that MSVC C++ allocates container proxy on any
* vector initialization, including static vectors which don't
* have any data yet. This leads to several issues:
*
* - Static objects initialization fiasco (global_stats from
* util_stats.h might not be initialized yet).
* - If main() function changes allocator type (for example,
* this might happen with `blender --debug-memory`) nobody
* will know how to convert already allocated memory to a new
* guarded allocator.
*
* Here we work this around by making it so container proxy does
* not use guarded allocation. A bit fragile, unfortunately.
*/
template<>
struct rebind<std::_Container_proxy> {
typedef std::allocator<std::_Container_proxy> other;
};
operator std::allocator<std::_Container_proxy>() const
{
return std::allocator<std::_Container_proxy>();
}
#endif
};
/* Get memory usage and peak from the guarded STL allocator. */
size_t util_guarded_get_mem_used(void);
size_t util_guarded_get_mem_peak(void);
/* Call given function and keep track if it runs out of memory.
*
* If it does run out f memory, stop execution and set progress
* to do a global cancel.
*
* It's not fully robust, but good enough to catch obvious issues
* when running out of memory.
*/
#define MEM_GUARDED_CALL(progress, func, ...) \
do { \
try { \
(func)(__VA_ARGS__); \
} \
catch (std::bad_alloc&) { \
fprintf(stderr, "Error: run out of memory!\n"); \
fflush(stderr); \
(progress)->set_error("Out of memory"); \
} \
} while(false)
CCL_NAMESPACE_END
#endif /* __UTIL_GUARDED_ALLOCATOR_H__ */
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