nlib
heap/nmalloc_withstl/nmalloc_withstl.cpp

STLでnmallocを利用するにはNMallocStlAllocator<T>を利用します。 std::vectorを使った場合のヒープの利用状況を、nmalloc_query(NMALLOC_QUERY_DUMP, ...)を用いて表示しています。

/*---------------------------------------------------------------------------*
Project: CrossRoad
Copyright (C)2012-2016 Nintendo. All rights reserved.
These coded instructions, statements, and computer programs contain
proprietary information of Nintendo of America Inc. and/or Nintendo
Company Ltd., and are protected by Federal copyright law. They may
not be disclosed to third parties or copied or duplicated in any form,
in whole or in part, without the prior written consent of Nintendo.
*---------------------------------------------------------------------------*/
#include <vector>
#include "nn/nlib/Config.h"
using ::nlib_ns::heap::NMallocStlAllocator;
// vector with a non-default allocator
typedef std::vector<int, NMallocStlAllocator<int> > MyVec;
static bool vector_pushback() {
MyVec vec;
for (int i = 0; i < 10000; ++i) {
vec.push_back(i);
if (i == 5000) {
// You can dump the current status of the heap in XML.
nlib_printf("#\n# heap status: i == 5000\n#\n");
// Note that it shows the cached memory allocated.
// You have to return the memory to the central heap,
// or set NMALLOC_HEAPOPTION_CACHE_DISABLE to heap_option.
nmalloc_query(NMALLOC_QUERY_CLEAR_CACHE);
nmalloc_query(NMALLOC_QUERY_DUMP, NMALLOC_DUMP_ALL, 1);
}
}
// Verifies here
for (int i = 0; i < 10000; ++i) {
if (vec[i] != i) return false;
}
// Dump again.
nlib_printf("#\n# heap status: i == 10000\n#\n");
nmalloc_query(NMALLOC_QUERY_CLEAR_CACHE);
nmalloc_query(NMALLOC_QUERY_DUMP, NMALLOC_DUMP_ALL, 1);
// vec.clear() and Dumps again.
vec.clear();
nlib_printf("#\n# heap status: vec.clear()\n#\n");
nmalloc_query(NMALLOC_QUERY_CLEAR_CACHE);
nmalloc_query(NMALLOC_QUERY_DUMP, NMALLOC_DUMP_ALL, 1); // the vector is free, but memory is not freed.
// vec.clear() does not free the memory for the vector.
MyVec(vec).swap(vec);
nlib_printf("#\n# heap status: fitting\n#\n");
nmalloc_query(NMALLOC_QUERY_CLEAR_CACHE);
nmalloc_query(NMALLOC_QUERY_DUMP, NMALLOC_DUMP_ALL, 1); // memory is freed...
return true;
}
static bool vector_pushback_with_reserve() {
MyVec vec;
vec.reserve(10000);
for (int i = 0; i < 10000; ++i) {
vec.push_back(i);
}
// Verifies here
for (int i = 0; i < 10000; ++i) {
if (vec[i] != i) return false;
}
nlib_printf("#\n# heap status: i == 10000(with reserve)\n#\n");
nmalloc_query(NMALLOC_QUERY_CLEAR_CACHE);
nmalloc_query(NMALLOC_QUERY_DUMP, NMALLOC_DUMP_ALL, 1);
return true;
}
#ifdef NLIB_HAS_VIRTUALMEMORY
extern "C" void nmalloc_get_settings(NMallocSettings* settings) {
settings->addr = NULL;
settings->size = 1024 * 512;
settings->heap_option = 0;
}
#else
const size_t heapmem_size = 1024 * 512;
NLIB_ALIGNAS(4096) static char heapmem[heapmem_size];
extern "C" void nmalloc_get_settings(NMallocSettings* settings) {
settings->addr = heapmem;
settings->size = heapmem_size;
settings->heap_option = 0;
}
#endif
static bool SampleMain(int, char**) { return vector_pushback() && vector_pushback_with_reserve(); }
NLIB_MAINFUNC