DWARF and unwind support for AOT assembly output.

runtime/vm/native_symbol_macos.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(HOST_OS_MACOS)
 
 #include "vm/native_symbol.h"
 
 #include <cxxabi.h>  // NOLINT
@@ skipping 26 matching lines @@
   }
   return strdup(info.dli_sname);
 }
 
 
 void NativeSymbolResolver::FreeSymbolName(char* name) {
   free(name);
 }
 
 
+bool NativeSymbolResolver::LookupSharedObject(uword pc,
+                                              uword* dso_base,
+                                              char** dso_name) {
+  Dl_info info;
+  int r = dladdr(reinterpret_cast<void*>(pc), &info);
+  if (r == 0) {
+    return false;
+  }
+  *dso_base = reinterpret_cast<uword>(info.dli_fbase);
+  *dso_name = strdup(info.dli_fname);
+  return true;
+}
+
 }  // namespace dart
 
 #endif  // defined(HOST_OS_MACOS)