diff --git a/compiler-rt/lib/hwasan/hwasan.h b/compiler-rt/lib/hwasan/hwasan.h
--- a/compiler-rt/lib/hwasan/hwasan.h
+++ b/compiler-rt/lib/hwasan/hwasan.h
@@ -16,6 +16,7 @@
 
 #include "hwasan_flags.h"
 #include "hwasan_interface_internal.h"
+#include "hwasan_mapping.h"
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_internal_defs.h"
@@ -78,6 +79,16 @@
 const unsigned kRecordFPLShift = 4;
 const unsigned kRecordFPModulus = 1 << (64 - kRecordFPShift + kRecordFPLShift);
 
+static inline bool InTaggableRegion(uptr addr) {
+#if defined(HWASAN_ALIASING_MODE)
+  // Aliases are mapped next to shadow so that the upper bits match the shadow
+  // base.
+  return (addr >> kTaggableRegionCheckShift) ==
+         (__hwasan::GetShadowOffset() >> kTaggableRegionCheckShift);
+#endif
+  return true;
+}
+
 static inline tag_t GetTagFromPointer(uptr p) {
   return (p >> kAddressTagShift) & kTagMask;
 }
diff --git a/compiler-rt/lib/hwasan/hwasan_allocator.h b/compiler-rt/lib/hwasan/hwasan_allocator.h
--- a/compiler-rt/lib/hwasan/hwasan_allocator.h
+++ b/compiler-rt/lib/hwasan/hwasan_allocator.h
@@ -127,16 +127,6 @@
 
 void GetAllocatorStats(AllocatorStatCounters s);
 
-inline bool InTaggableRegion(uptr addr) {
-#if defined(HWASAN_ALIASING_MODE)
-  // Aliases are mapped next to shadow so that the upper bits match the shadow
-  // base.
-  return (addr >> kTaggableRegionCheckShift) ==
-         (GetShadowOffset() >> kTaggableRegionCheckShift);
-#endif
-  return true;
-}
-
 } // namespace __hwasan
 
 #endif // HWASAN_ALLOCATOR_H
diff --git a/compiler-rt/lib/hwasan/hwasan_allocator.cpp b/compiler-rt/lib/hwasan/hwasan_allocator.cpp
--- a/compiler-rt/lib/hwasan/hwasan_allocator.cpp
+++ b/compiler-rt/lib/hwasan/hwasan_allocator.cpp
@@ -417,7 +417,7 @@
 
 static const void *AllocationBegin(const void *p) {
   const void *untagged_ptr =
-      __hwasan::InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
+      InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
   if (!untagged_ptr)
     return nullptr;
 
@@ -435,7 +435,7 @@
 
 static uptr AllocationSize(const void *p) {
   const void *untagged_ptr =
-      __hwasan::InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
+      InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
   if (!untagged_ptr) return 0;
   const void *beg = allocator.GetBlockBegin(untagged_ptr);
   if (!beg)
@@ -549,7 +549,7 @@
 }
 
 uptr PointsIntoChunk(void *p) {
-  p = __hwasan::InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
+  p = InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
   uptr addr = reinterpret_cast<uptr>(p);
   uptr chunk =
       reinterpret_cast<uptr>(__hwasan::allocator.GetBlockBeginFastLocked(p));
@@ -567,7 +567,7 @@
 }
 
 uptr GetUserBegin(uptr chunk) {
-  if (__hwasan::InTaggableRegion(chunk))
+  if (InTaggableRegion(chunk))
     CHECK_EQ(UntagAddr(chunk), chunk);
   void *block = __hwasan::allocator.GetBlockBeginFastLocked(
       reinterpret_cast<void *>(chunk));
@@ -583,13 +583,13 @@
 
 uptr GetUserAddr(uptr chunk) {
   tag_t mem_tag = *(tag_t *)__hwasan::MemToShadow(chunk);
-  if (!__hwasan::InTaggableRegion(chunk))
+  if (!InTaggableRegion(chunk))
     return chunk;
   return AddTagToPointer(chunk, mem_tag);
 }
 
 LsanMetadata::LsanMetadata(uptr chunk) {
-  if (__hwasan::InTaggableRegion(chunk))
+  if (InTaggableRegion(chunk))
     CHECK_EQ(UntagAddr(chunk), chunk);
   metadata_ =
       chunk ? __hwasan::allocator.GetMetaData(reinterpret_cast<void *>(chunk))
@@ -628,7 +628,7 @@
 }
 
 IgnoreObjectResult IgnoreObject(const void *p) {
-  p = __hwasan::InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
+  p = InTaggableRegion(reinterpret_cast<uptr>(p)) ? UntagPtr(p) : p;
   uptr addr = reinterpret_cast<uptr>(p);
   uptr chunk = reinterpret_cast<uptr>(__hwasan::allocator.GetBlockBegin(p));
   if (!chunk)