forked from OSchip/llvm-project
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
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//===-- 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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// Provisional implementation.
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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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extern "C" void *__libc_malloc(__sanitizer::uptr size);
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extern "C" void __libc_free(void *ptr);
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namespace __sanitizer {
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static const u64 kInternalAllocBlockMagic = 0x7A6CB03ABCEBC042ull;
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void *InternalAlloc(uptr size) {
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void *p = __libc_malloc(size + sizeof(u64));
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((u64*)p)[0] = kInternalAllocBlockMagic;
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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) return;
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addr = (char*)addr - sizeof(u64);
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CHECK_EQ(((u64*)addr)[0], kInternalAllocBlockMagic);
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((u64*)addr)[0] = 0;
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__libc_free(addr);
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}
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} // namespace __sanitizer
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