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diff --git a/libasan/sanitizer_common/sanitizer_procmaps.h b/libasan/sanitizer_common/sanitizer_procmaps.h
new file mode 100644
index 00000000000..5e5e5ce89be
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+++ b/libasan/sanitizer_common/sanitizer_procmaps.h
@@ -0,0 +1,95 @@
+//===-- sanitizer_procmaps.h ------------------------------------*- C++ -*-===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer.
+//
+// Information about the process mappings.
+//===----------------------------------------------------------------------===//
+#ifndef SANITIZER_PROCMAPS_H
+#define SANITIZER_PROCMAPS_H
+
+#include "sanitizer_internal_defs.h"
+
+namespace __sanitizer {
+
+#ifdef _WIN32
+class MemoryMappingLayout {
+ public:
+  MemoryMappingLayout() {}
+  bool GetObjectNameAndOffset(uptr addr, uptr *offset,
+                              char filename[], uptr filename_size) {
+    UNIMPLEMENTED();
+    return false;
+  }
+};
+
+#else  // _WIN32
+class MemoryMappingLayout {
+ public:
+  MemoryMappingLayout();
+  bool Next(uptr *start, uptr *end, uptr *offset,
+            char filename[], uptr filename_size);
+  void Reset();
+  // Gets the object file name and the offset in that object for a given
+  // address 'addr'. Returns true on success.
+  bool GetObjectNameAndOffset(uptr addr, uptr *offset,
+                              char filename[], uptr filename_size);
+  ~MemoryMappingLayout();
+
+ private:
+  // Default implementation of GetObjectNameAndOffset.
+  // Quite slow, because it iterates through the whole process map for each
+  // lookup.
+  bool IterateForObjectNameAndOffset(uptr addr, uptr *offset,
+                                     char filename[], uptr filename_size) {
+    Reset();
+    uptr start, end, file_offset;
+    for (int i = 0; Next(&start, &end, &file_offset, filename, filename_size);
+         i++) {
+      if (addr >= start && addr < end) {
+        // Don't subtract 'start' for the first entry:
+        // * If a binary is compiled w/o -pie, then the first entry in
+        //   process maps is likely the binary itself (all dynamic libs
+        //   are mapped higher in address space). For such a binary,
+        //   instruction offset in binary coincides with the actual
+        //   instruction address in virtual memory (as code section
+        //   is mapped to a fixed memory range).
+        // * If a binary is compiled with -pie, all the modules are
+        //   mapped high at address space (in particular, higher than
+        //   shadow memory of the tool), so the module can't be the
+        //   first entry.
+        *offset = (addr - (i ? start : 0)) + file_offset;
+        return true;
+      }
+    }
+    if (filename_size)
+      filename[0] = '\0';
+    return false;
+  }
+
+# if defined __linux__
+  char *proc_self_maps_buff_;
+  uptr proc_self_maps_buff_mmaped_size_;
+  uptr proc_self_maps_buff_len_;
+  char *current_;
+# elif defined __APPLE__
+  template<u32 kLCSegment, typename SegmentCommand>
+  bool NextSegmentLoad(uptr *start, uptr *end, uptr *offset,
+                       char filename[], uptr filename_size);
+  int current_image_;
+  u32 current_magic_;
+  u32 current_filetype_;
+  int current_load_cmd_count_;
+  char *current_load_cmd_addr_;
+# endif
+};
+
+#endif  // _WIN32
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_PROCMAPS_H