Bug 1114696 - Add MOZ_STRONG_REF and MOZ_WEAK_REF annotations; r=froydnj

mfbt/Attributes.h

@@ -512,6 +512,14 @@
  *   conversions.
  * MOZ_NO_ARITHMETIC_EXPR_IN_ARGUMENT: Applies to functions. Makes it a compile
  *   time error to pass arithmetic expressions on variables to the function.
+ * MOZ_STRONG_REF: Applies to declarations of pointer types.  This attribute
+ *   tells the compiler that the raw pointer is a strong reference, and that
+ *   property is somehow enforced by the code.  This can make the compiler
+ *   ignore these pointers when validating the usage of pointers otherwise.
+ * MOZ_WEAK_REF: Applies to declarations of pointer types.  This attribute
+ *   tells the compiler that the raw pointer is a weak reference, and that
+ *   property is somehow enforced by the code.  This can make the compiler
+ *   ignore these pointers when validating the usage of pointers otherwise.
  */
 #ifdef MOZ_CLANG_PLUGIN
 #  define MOZ_MUST_OVERRIDE __attribute__((annotate("moz_must_override")))
@@ -527,6 +535,8 @@
 #  endif
 #  define MOZ_IMPLICIT __attribute__((annotate("moz_implicit")))
 #  define MOZ_NO_ARITHMETIC_EXPR_IN_ARGUMENT __attribute__((annotate("moz_no_arith_expr_in_arg")))
+#  define MOZ_STRONG_REF __attribute__((annotate("moz_strong_ref")))
+#  define MOZ_WEAK_REF __attribute__((annotate("moz_weak_ref")))
 /*
  * 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
@@ -546,6 +556,8 @@
 #  define MOZ_IMPLICIT /* nothing */
 #  define MOZ_NO_ARITHMETIC_EXPR_IN_ARGUMENT /* nothing */
 #  define MOZ_HEAP_ALLOCATOR /* nothing */
+#  define MOZ_STRONG_REF /* nothing */
+#  define MOZ_WEAK_REF /* nothing */
 #endif /* MOZ_CLANG_PLUGIN */
 
 /*