1 files changed, 213 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cpp b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cpp
new file mode 100644
index 000000000000..1d5058c81acb
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cpp
@@ -0,0 +1,213 @@
+//===-- sanitizer_allocator.cpp -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries.
+// This allocator is used inside run-times.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_allocator.h"
+
+#include "sanitizer_allocator_checks.h"
+#include "sanitizer_allocator_internal.h"
+#include "sanitizer_atomic.h"
+#include "sanitizer_common.h"
+#include "sanitizer_platform.h"
+
+namespace __sanitizer {
+
+// Default allocator names.
+const char *PrimaryAllocatorName = "SizeClassAllocator";
+const char *SecondaryAllocatorName = "LargeMmapAllocator";
+
+alignas(64) static char internal_alloc_placeholder[sizeof(InternalAllocator)];
+static atomic_uint8_t internal_allocator_initialized;
+static StaticSpinMutex internal_alloc_init_mu;
+
+static InternalAllocatorCache internal_allocator_cache;
+static StaticSpinMutex internal_allocator_cache_mu;
+
+InternalAllocator *internal_allocator() {
+  InternalAllocator *internal_allocator_instance =
+      reinterpret_cast<InternalAllocator *>(&internal_alloc_placeholder);
+  if (atomic_load(&internal_allocator_initialized, memory_order_acquire) == 0) {
+    SpinMutexLock l(&internal_alloc_init_mu);
+    if (atomic_load(&internal_allocator_initialized, memory_order_relaxed) ==
+        0) {
+      internal_allocator_instance->Init(kReleaseToOSIntervalNever);
+      atomic_store(&internal_allocator_initialized, 1, memory_order_release);
+    }
+  }
+  return internal_allocator_instance;
+}
+
+static void *RawInternalAlloc(uptr size, InternalAllocatorCache *cache,
+                              uptr alignment) {
+  if (alignment == 0) alignment = 8;
+  if (cache == 0) {
+    SpinMutexLock l(&internal_allocator_cache_mu);
+    return internal_allocator()->Allocate(&internal_allocator_cache, size,
+                                          alignment);
+  }
+  return internal_allocator()->Allocate(cache, size, alignment);
+}
+
+static void *RawInternalRealloc(void *ptr, uptr size,
+                                InternalAllocatorCache *cache) {
+  uptr alignment = 8;
+  if (cache == 0) {
+    SpinMutexLock l(&internal_allocator_cache_mu);
+    return internal_allocator()->Reallocate(&internal_allocator_cache, ptr,
+                                            size, alignment);
+  }
+  return internal_allocator()->Reallocate(cache, ptr, size, alignment);
+}
+
+static void RawInternalFree(void *ptr, InternalAllocatorCache *cache) {
+  if (!cache) {
+    SpinMutexLock l(&internal_allocator_cache_mu);
+    return internal_allocator()->Deallocate(&internal_allocator_cache, ptr);
+  }
+  internal_allocator()->Deallocate(cache, ptr);
+}
+
+static void NORETURN ReportInternalAllocatorOutOfMemory(uptr requested_size) {
+  SetAllocatorOutOfMemory();
+  Report("FATAL: %s: internal allocator is out of memory trying to allocate "
+         "0x%zx bytes\n", SanitizerToolName, requested_size);
+  Die();
+}
+
+void *InternalAlloc(uptr size, InternalAllocatorCache *cache, uptr alignment) {
+  void *p = RawInternalAlloc(size, cache, alignment);
+  if (UNLIKELY(!p))
+    ReportInternalAllocatorOutOfMemory(size);
+  return p;
+}
+
+void *InternalRealloc(void *addr, uptr size, InternalAllocatorCache *cache) {
+  void *p = RawInternalRealloc(addr, size, cache);
+  if (UNLIKELY(!p))
+    ReportInternalAllocatorOutOfMemory(size);
+  return p;
+}
+
+void *InternalReallocArray(void *addr, uptr count, uptr size,
+                           InternalAllocatorCache *cache) {
+  if (UNLIKELY(CheckForCallocOverflow(count, size))) {
+    Report(
+        "FATAL: %s: reallocarray parameters overflow: count * size (%zd * %zd) "
+        "cannot be represented in type size_t\n",
+        SanitizerToolName, count, size);
+    Die();
+  }
+  return InternalRealloc(addr, count * size, cache);
+}
+
+void *InternalCalloc(uptr count, uptr size, InternalAllocatorCache *cache) {
+  if (UNLIKELY(CheckForCallocOverflow(count, size))) {
+    Report("FATAL: %s: calloc parameters overflow: count * size (%zd * %zd) "
+           "cannot be represented in type size_t\n", SanitizerToolName, count,
+           size);
+    Die();
+  }
+  void *p = InternalAlloc(count * size, cache);
+  if (LIKELY(p))
+    internal_memset(p, 0, count * size);
+  return p;
+}
+
+void InternalFree(void *addr, InternalAllocatorCache *cache) {
+  RawInternalFree(addr, cache);
+}
+
+void InternalAllocatorLock() SANITIZER_NO_THREAD_SAFETY_ANALYSIS {
+  internal_allocator_cache_mu.Lock();
+  internal_allocator()->ForceLock();
+}
+
+void InternalAllocatorUnlock() SANITIZER_NO_THREAD_SAFETY_ANALYSIS {
+  internal_allocator()->ForceUnlock();
+  internal_allocator_cache_mu.Unlock();
+}
+
+// LowLevelAllocator
+constexpr uptr kLowLevelAllocatorDefaultAlignment = 8;
+constexpr uptr kMinNumPagesRounded = 16;
+constexpr uptr kMinRoundedSize = 65536;
+static uptr low_level_alloc_min_alignment = kLowLevelAllocatorDefaultAlignment;
+static LowLevelAllocateCallback low_level_alloc_callback;
+
+static LowLevelAllocator Alloc;
+LowLevelAllocator &GetGlobalLowLevelAllocator() { return Alloc; }
+
+void *LowLevelAllocator::Allocate(uptr size) {
+  // Align allocation size.
+  size = RoundUpTo(size, low_level_alloc_min_alignment);
+  if (allocated_end_ - allocated_current_ < (sptr)size) {
+    uptr size_to_allocate = RoundUpTo(
+        size, Min(GetPageSizeCached() * kMinNumPagesRounded, kMinRoundedSize));
+    allocated_current_ = (char *)MmapOrDie(size_to_allocate, __func__);
+    allocated_end_ = allocated_current_ + size_to_allocate;
+    if (low_level_alloc_callback) {
+      low_level_alloc_callback((uptr)allocated_current_, size_to_allocate);
+    }
+  }
+  CHECK(allocated_end_ - allocated_current_ >= (sptr)size);
+  void *res = allocated_current_;
+  allocated_current_ += size;
+  return res;
+}
+
+void SetLowLevelAllocateMinAlignment(uptr alignment) {
+  CHECK(IsPowerOfTwo(alignment));
+  low_level_alloc_min_alignment = Max(alignment, low_level_alloc_min_alignment);
+}
+
+void SetLowLevelAllocateCallback(LowLevelAllocateCallback callback) {
+  low_level_alloc_callback = callback;
+}
+
+// Allocator's OOM and other errors handling support.
+
+static atomic_uint8_t allocator_out_of_memory = {0};
+static atomic_uint8_t allocator_may_return_null = {0};
+
+bool IsAllocatorOutOfMemory() {
+  return atomic_load_relaxed(&allocator_out_of_memory);
+}
+
+void SetAllocatorOutOfMemory() {
+  atomic_store_relaxed(&allocator_out_of_memory, 1);
+}
+
+bool AllocatorMayReturnNull() {
+  return atomic_load(&allocator_may_return_null, memory_order_relaxed);
+}
+
+void SetAllocatorMayReturnNull(bool may_return_null) {
+  atomic_store(&allocator_may_return_null, may_return_null,
+               memory_order_relaxed);
+}
+
+void PrintHintAllocatorCannotReturnNull() {
+  Report("HINT: if you don't care about these errors you may set "
+         "allocator_may_return_null=1\n");
+}
+
+static atomic_uint8_t rss_limit_exceeded;
+
+bool IsRssLimitExceeded() {
+  return atomic_load(&rss_limit_exceeded, memory_order_relaxed);
+}
+
+void SetRssLimitExceeded(bool limit_exceeded) {
+  atomic_store(&rss_limit_exceeded, limit_exceeded, memory_order_relaxed);
+}
+
+} // namespace __sanitizer