diff options
| -rw-r--r-- | lib/builtins/gcc_personality_v0.c | 11 | ||||
| -rw-r--r-- | lib/builtins/unwind-ehabi-helpers.h | 55 |
2 files changed, 66 insertions, 0 deletions
diff --git a/lib/builtins/gcc_personality_v0.c b/lib/builtins/gcc_personality_v0.c index 29e5be307..0bc765624 100644 --- a/lib/builtins/gcc_personality_v0.c +++ b/lib/builtins/gcc_personality_v0.c @@ -12,6 +12,17 @@ #include "int_lib.h" #include <unwind.h> +#if defined(__arm__) && !defined(__ARM_DWARF_EH__) && !defined(__USING_SJLJ_EXCEPTIONS__) +/* + * When building with older compilers (e.g. clang <3.9), it is possible that we + * have a version of unwind.h which does not provide the EHABI declarations + * which are quired for the C personality to conform to the specification. In + * order to provide forward compatibility for such compilers, we re-declare the + * necessary interfaces in the helper to permit a standalone compilation of the + * builtins (which contains the C unwinding personality for historical reasons). + */ +#include "unwind-ehabi-helpers.h" +#endif /* * Pointer encodings documented at: diff --git a/lib/builtins/unwind-ehabi-helpers.h b/lib/builtins/unwind-ehabi-helpers.h new file mode 100644 index 000000000..ccb076597 --- /dev/null +++ b/lib/builtins/unwind-ehabi-helpers.h @@ -0,0 +1,55 @@ +/* ===-- arm-ehabi-helpers.h - Supplementary ARM EHABI declarations --------=== + * + * The LLVM Compiler Infrastructure + * + * This file is dual licensed under the MIT and the University of Illinois Open + * Source Licenses. See LICENSE.TXT for details. + * + * ===--------------------------------------------------------------------=== */ + +#ifndef UNWIND_EHABI_HELPERS_H +#define UNWIND_EHABI_HELPERS_H + +#include <stdint.h> +/* NOTE: see reasoning for this inclusion below */ +#include <unwind.h> + +#if !defined(__ARM_EABI_UNWINDER__) + +/* + * NOTE: _URC_OK, _URC_FAILURE must be present as preprocessor tokens. This + * allows for a substitution of a constant which can be cast into the + * appropriate enumerated type. This header is expected to always be included + * AFTER unwind.h (which is why it is forcefully included above). This ensures + * that we do not overwrite the token for the enumeration. Subsequent uses of + * the token would be clean to rewrite with constant values. + * + * The typedef redeclaration should be safe. Due to the protection granted to + * us by the `__ARM_EABI_UNWINDER__` above, we are guaranteed that we are in a + * header not vended by gcc. The HP unwinder (being an itanium unwinder) does + * not support EHABI, and the GNU unwinder, derived from the HP unwinder, also + * does not support EHABI as of the introduction of this header. As such, we + * are fairly certain that we are in the LLVM case. Here, _Unwind_State is a + * typedef, and so we can get away with a redeclaration. + * + * Guarded redefinitions of the needed unwind state prevent the redefinition of + * those states. + */ + +#define _URC_OK 0 +#define _URC_FAILURE 9 + +typedef uint32_t _Unwind_State; + +#if !defined(_US_UNWIND_FRAME_STARTING) +#define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1) +#endif + +#if !defined(_US_ACTION_MASK) +#define _US_ACTION_MASK ((_Unwind_State)3) +#endif + +#endif + +#endif + |