Bug 1159433 - Part 2: Add the MOZ_NON_MEMMOVABLE and MOZ_NEEDS_MEMMOVABLE_TYPE macros to MFBT; r=froydnj

mfbt/Attributes.h

@@ -457,6 +457,12 @@
  * MOZ_NEEDS_NO_VTABLE_TYPE: Applies to template class declarations.  Makes it
  *   a compile time error to instantiate this template with a type parameter which
  *   has a VTable.
+ * MOZ_NON_MEMMOVABLE: Applies to class declarations for types that are not safe
+ *   to be moved in memory using memmove().
+ * MOZ_NEEDS_MEMMOVABLE_TYPE: Applies to template class declarations where the
+ *   template arguments are required to be safe to move in memory using
+ *   memmove().  Passing MOZ_NON_MEMMOVABLE types to these templates is a
+ *   compile time error.
  */
 #ifdef MOZ_CLANG_PLUGIN
 #  define MOZ_MUST_OVERRIDE __attribute__((annotate("moz_must_override")))
@@ -478,6 +484,8 @@
 #  define MOZ_NO_ADDREF_RELEASE_ON_RETURN __attribute__((annotate("moz_no_addref_release_on_return")))
 #  define MOZ_MUST_USE __attribute__((annotate("moz_must_use")))
 #  define MOZ_NEEDS_NO_VTABLE_TYPE __attribute__((annotate("moz_needs_no_vtable_type")))
+#  define MOZ_NON_MEMMOVABLE __attribute__((annotate("moz_non_memmovable")))
+#  define MOZ_NEEDS_MEMMOVABLE_TYPE __attribute__((annotate("moz_needs_memmovable_type")))
 /*
  * It turns out that clang doesn't like void func() __attribute__ {} without a
  * warning, so use pragmas to disable the warning. This code won't work on GCC
@@ -503,6 +511,8 @@
 #  define MOZ_NO_ADDREF_RELEASE_ON_RETURN /* nothing */
 #  define MOZ_MUST_USE /* nothing */
 #  define MOZ_NEEDS_NO_VTABLE_TYPE /* nothing */
+#  define MOZ_NON_MEMMOVABLE /* nothing */
+#  define MOZ_NEEDS_MEMMOVABLE_TYPE /* nothing */
 #endif /* MOZ_CLANG_PLUGIN */
 
 #endif /* __cplusplus */