165 lines
4.8 KiB
C++
165 lines
4.8 KiB
C++
/*
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Copyright (c) 2009-2012, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/allocator.hpp"
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#include "libtorrent/config.hpp"
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#include "libtorrent/assert.hpp"
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#ifdef TORRENT_WINDOWS
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#include <windows.h>
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#elif defined TORRENT_BEOS
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#include <kernel/OS.h>
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#include <stdlib.h> // malloc/free
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#else
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#include <stdlib.h> // valloc/free
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#include <unistd.h> // _SC_PAGESIZE
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#endif
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#if TORRENT_USE_MEMALIGN || TORRENT_USE_POSIX_MEMALIGN
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#include <malloc.h> // memalign
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#endif
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#ifdef TORRENT_DEBUG_BUFFERS
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#include <sys/mman.h>
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#include "libtorrent/size_type.hpp"
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struct alloc_header
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{
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libtorrent::size_type size;
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int magic;
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char stack[3072];
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};
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#endif
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#if defined TORRENT_DEBUG_BUFFERS && (defined __linux__ || (defined __APPLE__ && MAC_OS_X_VERSION_MIN_REQUIRED >= 1050))
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void print_backtrace(char* out, int len);
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#endif
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namespace libtorrent
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{
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int page_size()
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{
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static int s = 0;
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if (s != 0) return s;
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#ifdef TORRENT_WINDOWS
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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s = si.dwPageSize;
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#elif defined TORRENT_BEOS
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s = B_PAGE_SIZE;
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#else
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s = sysconf(_SC_PAGESIZE);
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#endif
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// assume the page size is 4 kiB if we
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// fail to query it
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if (s <= 0) s = 4096;
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return s;
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}
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char* page_aligned_allocator::malloc(size_type bytes)
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{
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#ifdef TORRENT_DEBUG_BUFFERS
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int page = page_size();
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int num_pages = (bytes + (page-1)) / page + 2;
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char* ret = (char*)valloc(num_pages * page);
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// make the two surrounding pages non-readable and -writable
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alloc_header* h = (alloc_header*)ret;
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h->size = bytes;
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h->magic = 0x1337;
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#if defined __linux__ || (defined __APPLE__ && MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
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print_backtrace(h->stack, sizeof(h->stack));
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#endif
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mprotect(ret, page, PROT_READ);
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mprotect(ret + (num_pages-1) * page, page, PROT_READ);
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// fprintf(stderr, "malloc: %p head: %p tail: %p size: %d\n", ret + page, ret, ret + page + bytes, int(bytes));
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return ret + page;
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#endif
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#if TORRENT_USE_POSIX_MEMALIGN
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void* ret;
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if (posix_memalign(&ret, page_size(), bytes) != 0) ret = 0;
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return (char*)ret;
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#elif TORRENT_USE_MEMALIGN
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return (char*)memalign(page_size(), bytes);
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#elif defined TORRENT_WINDOWS
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return (char*)VirtualAlloc(0, bytes, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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#elif defined TORRENT_BEOS
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void* ret = 0;
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area_id id = create_area("", &ret, B_ANY_ADDRESS
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, (bytes + page_size() - 1) & (page_size()-1), B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);
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if (id < B_OK) return 0;
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return (char*)ret;
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#else
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return (char*)valloc(bytes);
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#endif
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}
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void page_aligned_allocator::free(char* const block)
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{
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#ifdef TORRENT_DEBUG_BUFFERS
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int page = page_size();
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// make the two surrounding pages non-readable and -writable
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mprotect(block - page, page, PROT_READ | PROT_WRITE);
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alloc_header* h = (alloc_header*)(block - page);
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int num_pages = (h->size + (page-1)) / page + 2;
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TORRENT_ASSERT(h->magic == 0x1337);
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mprotect(block + (num_pages-2) * page, page, PROT_READ | PROT_WRITE);
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// fprintf(stderr, "free: %p head: %p tail: %p size: %d\n", block, block - page, block + h->size, int(h->size));
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h->magic = 0;
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#if defined __linux__ || (defined __APPLE__ && MAC_OS_X_VERSION_MIN_REQUIRED >= 1050)
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print_backtrace(h->stack, sizeof(h->stack));
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#endif
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::free(block - page);
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return;
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#endif
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#ifdef TORRENT_WINDOWS
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VirtualFree(block, 0, MEM_RELEASE);
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#elif defined TORRENT_BEOS
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area_id id = area_for(block);
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if (id < B_OK) return;
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delete_area(id);
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#else
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::free(block);
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#endif
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}
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}
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