| //===-- sanitizer_allocator.cc --------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is shared between AddressSanitizer and ThreadSanitizer |
| // run-time libraries. |
| // This allocator that is used inside run-times. |
| //===----------------------------------------------------------------------===// |
| #include "sanitizer_common.h" |
| |
| // FIXME: We should probably use more low-level allocator that would |
| // mmap some pages and split them into chunks to fulfill requests. |
| #if defined(__linux__) && !defined(ANDROID) |
| extern "C" void *__libc_malloc(__sanitizer::uptr size); |
| extern "C" void __libc_free(void *ptr); |
| # define LIBC_MALLOC __libc_malloc |
| # define LIBC_FREE __libc_free |
| #else // __linux__ |
| # include <stdlib.h> |
| # define LIBC_MALLOC malloc |
| # define LIBC_FREE free |
| #endif // __linux__ |
| |
| namespace __sanitizer { |
| |
| static const u64 kInternalAllocBlockMagic = 0x7A6CB03ABCEBC042ull; |
| |
| void *InternalAlloc(uptr size) { |
| void *p = LIBC_MALLOC(size + sizeof(u64)); |
| ((u64*)p)[0] = kInternalAllocBlockMagic; |
| return (char*)p + sizeof(u64); |
| } |
| |
| void InternalFree(void *addr) { |
| if (!addr) return; |
| addr = (char*)addr - sizeof(u64); |
| CHECK_EQ(((u64*)addr)[0], kInternalAllocBlockMagic); |
| ((u64*)addr)[0] = 0; |
| LIBC_FREE(addr); |
| } |
| |
| } // namespace __sanitizer |
