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Actually try to fix null-size undefined behavior 

Related to:
https://github.com/harfbuzz/harfbuzz/pull/2067
https://bugzilla.mozilla.org/show_bug.cgi?id=1577584
This commit is contained in:
Behdad Esfahbod 2022-05-26 03:59:21 -06:00
parent 6010feeeb5
commit 8df9aba997
1 changed files with 2 additions and 2 deletions
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4
src/hb-null.hh
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@ -108,7 +108,7 @@ struct NullHelper
/* Specializations for arbitrary-content Null objects expressed in bytes. */ /* Specializations for arbitrary-content Null objects expressed in bytes. */
#define DECLARE_NULL_NAMESPACE_BYTES(Namespace, Type) \ #define DECLARE_NULL_NAMESPACE_BYTES(Namespace, Type) \
} /* Close namespace. */ \ } /* Close namespace. */ \
extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[Namespace::Type::null_size]; \ extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[hb_null_size (Namespace::Type)]; \
template <> \ template <> \
struct Null<Namespace::Type> { \ struct Null<Namespace::Type> { \
static Namespace::Type const & get_null () { \ static Namespace::Type const & get_null () { \
@ -118,7 +118,7 @@ struct NullHelper
namespace Namespace { \ namespace Namespace { \
static_assert (true, "") /* Require semicolon after. */ static_assert (true, "") /* Require semicolon after. */
#define DEFINE_NULL_NAMESPACE_BYTES(Namespace, Type) \ #define DEFINE_NULL_NAMESPACE_BYTES(Namespace, Type) \
const unsigned char _hb_Null_##Namespace##_##Type[Namespace::Type::null_size] const unsigned char _hb_Null_##Namespace##_##Type[hb_null_size (Namespace::Type)]
/* Specializations for arbitrary-content Null objects expressed as struct initializer. */ /* Specializations for arbitrary-content Null objects expressed as struct initializer. */
#define DECLARE_NULL_INSTANCE(Type) \ #define DECLARE_NULL_INSTANCE(Type) \