1 //===-- arm-ehabi-helpers.h - Supplementary ARM EHABI declarations --------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===--------------------------------------------------------------------===// 8 9 #ifndef UNWIND_EHABI_HELPERS_H 10 #define UNWIND_EHABI_HELPERS_H 11 12 #include <stdint.h> 13 // NOTE: see reasoning for this inclusion below 14 #include <unwind.h> 15 16 #if !defined(__ARM_EABI_UNWINDER__) 17 18 // NOTE: _URC_OK, _URC_FAILURE must be present as preprocessor tokens. This 19 // allows for a substitution of a constant which can be cast into the 20 // appropriate enumerated type. This header is expected to always be included 21 // AFTER unwind.h (which is why it is forcefully included above). This ensures 22 // that we do not overwrite the token for the enumeration. Subsequent uses of 23 // the token would be clean to rewrite with constant values. 24 // 25 // The typedef redeclaration should be safe. Due to the protection granted to 26 // us by the `__ARM_EABI_UNWINDER__` above, we are guaranteed that we are in a 27 // header not vended by gcc. The HP unwinder (being an itanium unwinder) does 28 // not support EHABI, and the GNU unwinder, derived from the HP unwinder, also 29 // does not support EHABI as of the introduction of this header. As such, we 30 // are fairly certain that we are in the LLVM case. Here, _Unwind_State is a 31 // typedef, and so we can get away with a redeclaration. 32 // 33 // Guarded redefinitions of the needed unwind state prevent the redefinition of 34 // those states. 35 36 #define _URC_OK 0 37 #define _URC_FAILURE 9 38 39 typedef uint32_t _Unwind_State; 40 41 #if !defined(_US_UNWIND_FRAME_STARTING) 42 #define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1) 43 #endif 44 45 #if !defined(_US_ACTION_MASK) 46 #define _US_ACTION_MASK ((_Unwind_State)3) 47 #endif 48 49 #endif 50 51 #endif 52