- Make sure to be able to deal with unaligned snapshot buffers

runtime/platform/globals.h

 // Copyright (c) 2012, 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.
 
 #ifndef PLATFORM_GLOBALS_H_
 #define PLATFORM_GLOBALS_H_
 
 // __STDC_FORMAT_MACROS has to be defined before including <inttypes.h> to
 // enable platform independent printf format specifiers.
 #ifndef __STDC_FORMAT_MACROS
@@ skipping 459 matching lines @@
 inline D bit_copy(const S& source) {
   D destination;
   // This use of memcpy is safe: source and destination cannot overlap.
   memcpy(&destination,
          reinterpret_cast<const void*>(&source),
          sizeof(destination));
   return destination;
 }
 
 
+// Similar to bit_copy and bit_cast, but does take the type from the argument.
+template <typename T>
+static inline T ReadUnaligned(const T* ptr) {
+  T value;
+  memcpy(&value, ptr, sizeof(value));
+  return value;
+}
+
+
 // On Windows the reentrent version of strtok is called
 // strtok_s. Unify on the posix name strtok_r.
 #if defined(TARGET_OS_WINDOWS)
 #define snprintf _snprintf
 #define strtok_r strtok_s
 #endif
 
 #if !defined(TARGET_OS_WINDOWS)
 #if defined(TEMP_FAILURE_RETRY)
 // TEMP_FAILURE_RETRY is defined in unistd.h on some platforms. We should
@@ skipping 11 matching lines @@
 // N.B.: As the GCC manual states, "[s]ince non-static C++ methods
 // have an implicit 'this' argument, the arguments of such methods
 // should be counted from two, not one."
 #define PRINTF_ATTRIBUTE(string_index, first_to_check) \
   __attribute__((__format__(__printf__, string_index, first_to_check)))
 #else
 #define PRINTF_ATTRIBUTE(string_index, first_to_check)
 #endif
 
 #endif  // PLATFORM_GLOBALS_H_