forked from OSchip/llvm-project
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
//===-- sanitizer_allocator.cc --------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries.
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// This allocator that is used inside run-times.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common.h"
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// FIXME: We should probably use more low-level allocator that would
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// mmap some pages and split them into chunks to fulfill requests.
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#ifdef __linux__
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extern "C" void *__libc_malloc(__sanitizer::uptr size);
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extern "C" void __libc_free(void *ptr);
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# define LIBC_MALLOC __libc_malloc
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# define LIBC_FREE __libc_free
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#else // __linux__
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# include <stdlib.h>
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# define LIBC_MALLOC malloc
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# define LIBC_FREE free
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#endif // __linux__
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namespace __sanitizer {
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const u64 kBlockMagic = 0x6A6CB03ABCEBC041ull;
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void *InternalAlloc(uptr size) {
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if (size + sizeof(u64) < size)
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return 0;
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void *p = LIBC_MALLOC(size + sizeof(u64));
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if (p == 0)
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return 0;
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((u64*)p)[0] = kBlockMagic;
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return (char*)p + sizeof(u64);
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}
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void InternalFree(void *addr) {
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if (addr == 0)
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return;
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addr = (char*)addr - sizeof(u64);
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CHECK_EQ(((u64*)addr)[0], kBlockMagic);
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((u64*)addr)[0] = 0;
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LIBC_FREE(addr);
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}
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void *InternalAllocBlock(void *p) {
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CHECK_NE(p, (void*)0);
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u64 *pp = (u64*)((uptr)p & ~0x7);
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for (; pp[0] != kBlockMagic; pp--) {}
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return pp + 1;
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}
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} // namespace __sanitizer
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