Retro68/gcc/libsanitizer/tsan/tsan_mman.cc

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