forked from OSchip/llvm-project
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
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/* ===-- arm-ehabi-helpers.h - Supplementary ARM EHABI declarations --------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===--------------------------------------------------------------------=== */
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#ifndef UNWIND_EHABI_HELPERS_H
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#define UNWIND_EHABI_HELPERS_H
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#include <stdint.h>
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/* NOTE: see reasoning for this inclusion below */
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#include <unwind.h>
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#if !defined(__ARM_EABI_UNWINDER__)
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/*
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* NOTE: _URC_OK, _URC_FAILURE must be present as preprocessor tokens. This
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* allows for a substitution of a constant which can be cast into the
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* appropriate enumerated type. This header is expected to always be included
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* AFTER unwind.h (which is why it is forcefully included above). This ensures
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* that we do not overwrite the token for the enumeration. Subsequent uses of
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* the token would be clean to rewrite with constant values.
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*
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* The typedef redeclaration should be safe. Due to the protection granted to
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* us by the `__ARM_EABI_UNWINDER__` above, we are guaranteed that we are in a
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* header not vended by gcc. The HP unwinder (being an itanium unwinder) does
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* not support EHABI, and the GNU unwinder, derived from the HP unwinder, also
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* does not support EHABI as of the introduction of this header. As such, we
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* are fairly certain that we are in the LLVM case. Here, _Unwind_State is a
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* typedef, and so we can get away with a redeclaration.
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*
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* Guarded redefinitions of the needed unwind state prevent the redefinition of
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* those states.
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*/
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#define _URC_OK 0
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#define _URC_FAILURE 9
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typedef uint32_t _Unwind_State;
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#if !defined(_US_UNWIND_FRAME_STARTING)
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#define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1)
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#endif
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#if !defined(_US_ACTION_MASK)
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#define _US_ACTION_MASK ((_Unwind_State)3)
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#endif
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#endif
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#endif
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