152 lines
4.6 KiB
C++
152 lines
4.6 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 is used inside run-times.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_allocator.h"
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_common.h"
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#include "sanitizer_flags.h"
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namespace __sanitizer {
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// ThreadSanitizer for Go uses libc malloc/free.
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#if defined(SANITIZER_GO) || defined(SANITIZER_USE_MALLOC)
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# if SANITIZER_LINUX && !SANITIZER_ANDROID
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extern "C" void *__libc_malloc(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
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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
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static void *RawInternalAlloc(uptr size, InternalAllocatorCache *cache) {
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(void)cache;
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return LIBC_MALLOC(size);
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}
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static void RawInternalFree(void *ptr, InternalAllocatorCache *cache) {
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(void)cache;
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LIBC_FREE(ptr);
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}
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InternalAllocator *internal_allocator() {
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return 0;
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}
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#else // SANITIZER_GO
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static ALIGNED(64) char internal_alloc_placeholder[sizeof(InternalAllocator)];
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static atomic_uint8_t internal_allocator_initialized;
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static StaticSpinMutex internal_alloc_init_mu;
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static InternalAllocatorCache internal_allocator_cache;
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static StaticSpinMutex internal_allocator_cache_mu;
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InternalAllocator *internal_allocator() {
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InternalAllocator *internal_allocator_instance =
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reinterpret_cast<InternalAllocator *>(&internal_alloc_placeholder);
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if (atomic_load(&internal_allocator_initialized, memory_order_acquire) == 0) {
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SpinMutexLock l(&internal_alloc_init_mu);
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if (atomic_load(&internal_allocator_initialized, memory_order_relaxed) ==
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0) {
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internal_allocator_instance->Init();
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atomic_store(&internal_allocator_initialized, 1, memory_order_release);
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}
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}
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return internal_allocator_instance;
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}
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static void *RawInternalAlloc(uptr size, InternalAllocatorCache *cache) {
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if (cache == 0) {
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SpinMutexLock l(&internal_allocator_cache_mu);
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return internal_allocator()->Allocate(&internal_allocator_cache, size, 8,
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false);
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}
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return internal_allocator()->Allocate(cache, size, 8, false);
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}
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static void RawInternalFree(void *ptr, InternalAllocatorCache *cache) {
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if (cache == 0) {
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SpinMutexLock l(&internal_allocator_cache_mu);
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return internal_allocator()->Deallocate(&internal_allocator_cache, ptr);
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}
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internal_allocator()->Deallocate(cache, ptr);
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}
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#endif // SANITIZER_GO
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const u64 kBlockMagic = 0x6A6CB03ABCEBC041ull;
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void *InternalAlloc(uptr size, InternalAllocatorCache *cache) {
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if (size + sizeof(u64) < size)
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return 0;
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void *p = RawInternalAlloc(size + sizeof(u64), cache);
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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, InternalAllocatorCache *cache) {
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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(kBlockMagic, ((u64*)addr)[0]);
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((u64*)addr)[0] = 0;
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RawInternalFree(addr, cache);
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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, __func__);
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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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void *AllocatorReturnNull() {
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if (common_flags()->allocator_may_return_null)
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return 0;
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Report("%s's allocator is terminating the process instead of returning 0\n",
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SanitizerToolName);
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Report("If you don't like this behavior set allocator_may_return_null=1\n");
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CHECK(0);
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return 0;
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}
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} // namespace __sanitizer
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