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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 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 | // C++ ABI Level 1 ABI documented at: |
| 9 | // https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #ifndef __ITANIUM_UNWIND_H__ |
| 14 | #define __ITANIUM_UNWIND_H__ |
| 15 | |
| 16 | struct _Unwind_Context; // opaque |
| 17 | struct _Unwind_Exception; // forward declaration |
| 18 | typedef struct _Unwind_Exception _Unwind_Exception; |
| 19 | typedef uint64_t _Unwind_Exception_Class; |
| 20 | |
| 21 | struct _Unwind_Exception { |
| 22 | _Unwind_Exception_Class exception_class; |
| 23 | void (*exception_cleanup)(_Unwind_Reason_Code reason, |
| 24 | _Unwind_Exception *exc); |
| 25 | #if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__) |
| 26 | uintptr_t private_[6]; |
| 27 | #else |
| 28 | uintptr_t private_1; // non-zero means forced unwind |
| 29 | uintptr_t private_2; // holds sp that phase1 found for phase2 to use |
| 30 | #endif |
| 31 | #if __SIZEOF_POINTER__ == 4 |
| 32 | // The implementation of _Unwind_Exception uses an attribute mode on the |
| 33 | // above fields which has the side effect of causing this whole struct to |
| 34 | // round up to 32 bytes in size (48 with SEH). To be more explicit, we add |
| 35 | // pad fields added for binary compatibility. |
| 36 | uint32_t reserved[3]; |
| 37 | #endif |
| 38 | // The Itanium ABI requires that _Unwind_Exception objects are "double-word |
| 39 | // aligned". GCC has interpreted this to mean "use the maximum useful |
| 40 | // alignment for the target"; so do we. |
| 41 | } __attribute__((__aligned__)); |
| 42 | |
| 43 | typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)( |
| 44 | int version, _Unwind_Action actions, uint64_t exceptionClass, |
| 45 | _Unwind_Exception *exceptionObject, struct _Unwind_Context *context); |
| 46 | |
| 47 | #ifdef __cplusplus |
| 48 | extern "C" { |
| 49 | #endif |
| 50 | |
| 51 | // |
| 52 | // The following are the base functions documented by the C++ ABI |
| 53 | // |
| 54 | #ifdef __USING_SJLJ_EXCEPTIONS__ |
| 55 | extern _Unwind_Reason_Code |
| 56 | _Unwind_SjLj_RaiseException(_Unwind_Exception *exception_object); |
| 57 | extern void _Unwind_SjLj_Resume(_Unwind_Exception *exception_object); |
| 58 | #else |
| 59 | extern _Unwind_Reason_Code |
| 60 | _Unwind_RaiseException(_Unwind_Exception *exception_object); |
| 61 | extern void _Unwind_Resume(_Unwind_Exception *exception_object); |
| 62 | #endif |
| 63 | extern void _Unwind_DeleteException(_Unwind_Exception *exception_object); |
| 64 | |
| 65 | |
| 66 | extern uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index); |
| 67 | extern void _Unwind_SetGR(struct _Unwind_Context *context, int index, |
| 68 | uintptr_t new_value); |
| 69 | extern uintptr_t _Unwind_GetIP(struct _Unwind_Context *context); |
| 70 | extern void _Unwind_SetIP(struct _Unwind_Context *, uintptr_t new_value); |
| 71 | |
| 72 | #ifdef __cplusplus |
| 73 | } |
| 74 | #endif |
| 75 | |
| 76 | #endif // __ITANIUM_UNWIND_H__ |
| 77 |
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