mirror of
https://github.com/autc04/Retro68.git
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242 lines
6.7 KiB
C++
242 lines
6.7 KiB
C++
//===-- tsan_mman.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 a part of ThreadSanitizer (TSan), a race detector.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "tsan_mman.h"
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#include "tsan_rtl.h"
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#include "tsan_report.h"
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#include "tsan_flags.h"
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// May be overriden by front-end.
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extern "C" void WEAK __sanitizer_malloc_hook(void *ptr, uptr size) {
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(void)ptr;
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(void)size;
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}
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extern "C" void WEAK __sanitizer_free_hook(void *ptr) {
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(void)ptr;
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}
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namespace __tsan {
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struct MapUnmapCallback {
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void OnMap(uptr p, uptr size) const { }
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void OnUnmap(uptr p, uptr size) const {
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// We are about to unmap a chunk of user memory.
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// Mark the corresponding shadow memory as not needed.
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DontNeedShadowFor(p, size);
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// Mark the corresponding meta shadow memory as not needed.
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// Note the block does not contain any meta info at this point
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// (this happens after free).
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const uptr kMetaRatio = kMetaShadowCell / kMetaShadowSize;
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const uptr kPageSize = GetPageSizeCached() * kMetaRatio;
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// Block came from LargeMmapAllocator, so must be large.
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// We rely on this in the calculations below.
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CHECK_GE(size, 2 * kPageSize);
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uptr diff = RoundUp(p, kPageSize) - p;
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if (diff != 0) {
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p += diff;
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size -= diff;
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}
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diff = p + size - RoundDown(p + size, kPageSize);
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if (diff != 0)
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size -= diff;
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FlushUnneededShadowMemory((uptr)MemToMeta(p), size / kMetaRatio);
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}
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};
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static char allocator_placeholder[sizeof(Allocator)] ALIGNED(64);
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Allocator *allocator() {
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return reinterpret_cast<Allocator*>(&allocator_placeholder);
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}
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void InitializeAllocator() {
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allocator()->Init(common_flags()->allocator_may_return_null);
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}
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void AllocatorThreadStart(ThreadState *thr) {
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allocator()->InitCache(&thr->alloc_cache);
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internal_allocator()->InitCache(&thr->internal_alloc_cache);
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}
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void AllocatorThreadFinish(ThreadState *thr) {
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allocator()->DestroyCache(&thr->alloc_cache);
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internal_allocator()->DestroyCache(&thr->internal_alloc_cache);
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}
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void AllocatorPrintStats() {
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allocator()->PrintStats();
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}
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static void SignalUnsafeCall(ThreadState *thr, uptr pc) {
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if (atomic_load_relaxed(&thr->in_signal_handler) == 0 ||
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!flags()->report_signal_unsafe)
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return;
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VarSizeStackTrace stack;
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ObtainCurrentStack(thr, pc, &stack);
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if (IsFiredSuppression(ctx, ReportTypeSignalUnsafe, stack))
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return;
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ThreadRegistryLock l(ctx->thread_registry);
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ScopedReport rep(ReportTypeSignalUnsafe);
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rep.AddStack(stack, true);
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OutputReport(thr, rep);
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}
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void *user_alloc(ThreadState *thr, uptr pc, uptr sz, uptr align, bool signal) {
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if ((sz >= (1ull << 40)) || (align >= (1ull << 40)))
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return allocator()->ReturnNullOrDie();
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void *p = allocator()->Allocate(&thr->alloc_cache, sz, align);
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if (p == 0)
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return 0;
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if (ctx && ctx->initialized)
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OnUserAlloc(thr, pc, (uptr)p, sz, true);
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if (signal)
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SignalUnsafeCall(thr, pc);
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return p;
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}
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void *user_calloc(ThreadState *thr, uptr pc, uptr size, uptr n) {
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if (CallocShouldReturnNullDueToOverflow(size, n))
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return allocator()->ReturnNullOrDie();
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void *p = user_alloc(thr, pc, n * size);
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if (p)
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internal_memset(p, 0, n * size);
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return p;
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}
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void user_free(ThreadState *thr, uptr pc, void *p, bool signal) {
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if (ctx && ctx->initialized)
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OnUserFree(thr, pc, (uptr)p, true);
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allocator()->Deallocate(&thr->alloc_cache, p);
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if (signal)
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SignalUnsafeCall(thr, pc);
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}
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void OnUserAlloc(ThreadState *thr, uptr pc, uptr p, uptr sz, bool write) {
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DPrintf("#%d: alloc(%zu) = %p\n", thr->tid, sz, p);
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ctx->metamap.AllocBlock(thr, pc, p, sz);
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if (write && thr->ignore_reads_and_writes == 0)
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MemoryRangeImitateWrite(thr, pc, (uptr)p, sz);
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else
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MemoryResetRange(thr, pc, (uptr)p, sz);
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}
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void OnUserFree(ThreadState *thr, uptr pc, uptr p, bool write) {
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CHECK_NE(p, (void*)0);
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uptr sz = ctx->metamap.FreeBlock(thr, pc, p);
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DPrintf("#%d: free(%p, %zu)\n", thr->tid, p, sz);
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if (write && thr->ignore_reads_and_writes == 0)
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MemoryRangeFreed(thr, pc, (uptr)p, sz);
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}
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void *user_realloc(ThreadState *thr, uptr pc, void *p, uptr sz) {
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void *p2 = 0;
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// FIXME: Handle "shrinking" more efficiently,
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// it seems that some software actually does this.
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if (sz) {
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p2 = user_alloc(thr, pc, sz);
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if (p2 == 0)
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return 0;
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if (p) {
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uptr oldsz = user_alloc_usable_size(p);
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internal_memcpy(p2, p, min(oldsz, sz));
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}
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}
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if (p)
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user_free(thr, pc, p);
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return p2;
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}
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uptr user_alloc_usable_size(const void *p) {
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if (p == 0)
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return 0;
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MBlock *b = ctx->metamap.GetBlock((uptr)p);
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return b ? b->siz : 0;
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}
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void invoke_malloc_hook(void *ptr, uptr size) {
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ThreadState *thr = cur_thread();
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if (ctx == 0 || !ctx->initialized || thr->ignore_interceptors)
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return;
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__sanitizer_malloc_hook(ptr, size);
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}
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void invoke_free_hook(void *ptr) {
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ThreadState *thr = cur_thread();
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if (ctx == 0 || !ctx->initialized || thr->ignore_interceptors)
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return;
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__sanitizer_free_hook(ptr);
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}
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void *internal_alloc(MBlockType typ, uptr sz) {
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ThreadState *thr = cur_thread();
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if (thr->nomalloc) {
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thr->nomalloc = 0; // CHECK calls internal_malloc().
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CHECK(0);
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}
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return InternalAlloc(sz, &thr->internal_alloc_cache);
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}
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void internal_free(void *p) {
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ThreadState *thr = cur_thread();
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if (thr->nomalloc) {
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thr->nomalloc = 0; // CHECK calls internal_malloc().
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CHECK(0);
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}
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InternalFree(p, &thr->internal_alloc_cache);
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}
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} // namespace __tsan
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using namespace __tsan;
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extern "C" {
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uptr __sanitizer_get_current_allocated_bytes() {
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uptr stats[AllocatorStatCount];
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allocator()->GetStats(stats);
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return stats[AllocatorStatAllocated];
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}
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uptr __sanitizer_get_heap_size() {
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uptr stats[AllocatorStatCount];
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allocator()->GetStats(stats);
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return stats[AllocatorStatMapped];
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}
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uptr __sanitizer_get_free_bytes() {
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return 1;
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}
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uptr __sanitizer_get_unmapped_bytes() {
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return 1;
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}
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uptr __sanitizer_get_estimated_allocated_size(uptr size) {
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return size;
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}
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int __sanitizer_get_ownership(const void *p) {
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return allocator()->GetBlockBegin(p) != 0;
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}
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uptr __sanitizer_get_allocated_size(const void *p) {
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return user_alloc_usable_size(p);
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}
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void __tsan_on_thread_idle() {
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ThreadState *thr = cur_thread();
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allocator()->SwallowCache(&thr->alloc_cache);
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internal_allocator()->SwallowCache(&thr->internal_alloc_cache);
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ctx->metamap.OnThreadIdle(thr);
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}
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} // extern "C"
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