83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
//===-- sanitizer_allocator.cc --------------------------------------------===//
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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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#if defined(__linux__) && !defined(__ANDROID__)
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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__ && !ANDROID
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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__ && !ANDROID
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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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// LowLevelAllocator
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static LowLevelAllocateCallback low_level_alloc_callback;
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void *LowLevelAllocator::Allocate(uptr size) {
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// Align allocation size.
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size = RoundUpTo(size, 8);
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if (allocated_end_ - allocated_current_ < (sptr)size) {
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uptr size_to_allocate = Max(size, GetPageSizeCached());
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allocated_current_ =
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(char*)MmapOrDie(size_to_allocate, __FUNCTION__);
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allocated_end_ = allocated_current_ + size_to_allocate;
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if (low_level_alloc_callback) {
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low_level_alloc_callback((uptr)allocated_current_,
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size_to_allocate);
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}
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}
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CHECK(allocated_end_ - allocated_current_ >= (sptr)size);
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void *res = allocated_current_;
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allocated_current_ += size;
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return res;
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}
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void SetLowLevelAllocateCallback(LowLevelAllocateCallback callback) {
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low_level_alloc_callback = callback;
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}
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bool CallocShouldReturnNullDueToOverflow(uptr size, uptr n) {
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if (!size) return false;
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uptr max = (uptr)-1L;
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return (max / size) < n;
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}
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} // namespace __sanitizer
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