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032d422d2e
libunwind in all cases when installed. At the time, Clang's unwind.h didn't provide huge chunks of the LSB-specified unwind interface, and was generally too aenemic to use for real software. However, it has since then become a strict superset of the APIs provided by libunwind on Linux. Notably, you cannot compile llgo's libgo library against libunwind, but you can against Clang's unwind.h. So let's just use our header. =] I've checked pretty thoroughly for any incompatibilities, and I am not aware of any. An open question is whether or not we should continue to munge GNU_SOURCE here. I didn't touch that as it potentially has compatibility implications on systems I cannot easily test -- Darwin. If a Darwin maintainer can verify that this is in fact unnecessary and remove it, cool. Until then, leaving it in makes this change a no-op there, and only really relevant on Linux systems where it is pretty clearly the right way to go. llvm-svn: 224934
283 lines
9.3 KiB
C
283 lines
9.3 KiB
C
/*===---- unwind.h - Stack unwinding ----------------------------------------===
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*===-----------------------------------------------------------------------===
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*/
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/* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/
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#ifndef __CLANG_UNWIND_H
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#define __CLANG_UNWIND_H
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#if defined(__APPLE__) && __has_include_next(<unwind.h>)
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/* Darwin (from 11.x on) provide an unwind.h. If that's available,
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* use it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE,
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* so define that around the include.*/
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# ifndef _GNU_SOURCE
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# define _SHOULD_UNDEFINE_GNU_SOURCE
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# define _GNU_SOURCE
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# endif
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// libunwind's unwind.h reflects the current visibility. However, Mozilla
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// builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the
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// visibility to default and export its contents. gcc also allows users to
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// override its override by #defining HIDE_EXPORTS (but note, this only obeys
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// the user's -fvisibility setting; it doesn't hide any exports on its own). We
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// imitate gcc's header here:
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# ifdef HIDE_EXPORTS
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# include_next <unwind.h>
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# else
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# pragma GCC visibility push(default)
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# include_next <unwind.h>
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# pragma GCC visibility pop
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# endif
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# ifdef _SHOULD_UNDEFINE_GNU_SOURCE
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# undef _GNU_SOURCE
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# undef _SHOULD_UNDEFINE_GNU_SOURCE
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# endif
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#else
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* It is a bit strange for a header to play with the visibility of the
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symbols it declares, but this matches gcc's behavior and some programs
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depend on it */
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility push(default)
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#endif
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typedef uintptr_t _Unwind_Word;
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typedef intptr_t _Unwind_Sword;
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typedef uintptr_t _Unwind_Ptr;
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typedef uintptr_t _Unwind_Internal_Ptr;
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typedef uint64_t _Unwind_Exception_Class;
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typedef intptr_t _sleb128_t;
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typedef uintptr_t _uleb128_t;
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struct _Unwind_Context;
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struct _Unwind_Exception;
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typedef enum {
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_URC_NO_REASON = 0,
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_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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_URC_FATAL_PHASE2_ERROR = 2,
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_URC_FATAL_PHASE1_ERROR = 3,
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_URC_NORMAL_STOP = 4,
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_URC_END_OF_STACK = 5,
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_URC_HANDLER_FOUND = 6,
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_URC_INSTALL_CONTEXT = 7,
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_URC_CONTINUE_UNWIND = 8
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} _Unwind_Reason_Code;
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typedef enum {
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_UA_SEARCH_PHASE = 1,
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_UA_CLEANUP_PHASE = 2,
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_UA_HANDLER_FRAME = 4,
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_UA_FORCE_UNWIND = 8,
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_UA_END_OF_STACK = 16 /* gcc extension to C++ ABI */
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} _Unwind_Action;
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typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code,
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struct _Unwind_Exception *);
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struct _Unwind_Exception {
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_Unwind_Exception_Class exception_class;
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_Unwind_Exception_Cleanup_Fn exception_cleanup;
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_Unwind_Word private_1;
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_Unwind_Word private_2;
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/* The Itanium ABI requires that _Unwind_Exception objects are "double-word
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* aligned". GCC has interpreted this to mean "use the maximum useful
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* alignment for the target"; so do we. */
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} __attribute__((__aligned__));
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typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action,
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_Unwind_Exception_Class,
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struct _Unwind_Exception *,
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struct _Unwind_Context *,
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void *);
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typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(
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int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
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struct _Unwind_Context *);
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typedef _Unwind_Personality_Fn __personality_routine;
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typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *,
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void *);
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#if defined(__arm__) && !defined(__APPLE__)
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typedef enum {
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_UVRSC_CORE = 0, /* integer register */
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_UVRSC_VFP = 1, /* vfp */
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_UVRSC_WMMXD = 3, /* Intel WMMX data register */
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_UVRSC_WMMXC = 4 /* Intel WMMX control register */
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} _Unwind_VRS_RegClass;
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typedef enum {
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_UVRSD_UINT32 = 0,
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_UVRSD_VFPX = 1,
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_UVRSD_UINT64 = 3,
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_UVRSD_FLOAT = 4,
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_UVRSD_DOUBLE = 5
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} _Unwind_VRS_DataRepresentation;
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typedef enum {
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_UVRSR_OK = 0,
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_UVRSR_NOT_IMPLEMENTED = 1,
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_UVRSR_FAILED = 2
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} _Unwind_VRS_Result;
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_Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context,
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_Unwind_VRS_RegClass __regclass,
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uint32_t __regno,
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_Unwind_VRS_DataRepresentation __representation,
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void *__valuep);
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_Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *__context,
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_Unwind_VRS_RegClass __regclass,
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uint32_t __regno,
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_Unwind_VRS_DataRepresentation __representation,
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void *__valuep);
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static __inline__
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_Unwind_Word _Unwind_GetGR(struct _Unwind_Context *__context, int __index) {
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_Unwind_Word __value;
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_Unwind_VRS_Get(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value);
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return __value;
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}
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static __inline__
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void _Unwind_SetGR(struct _Unwind_Context *__context, int __index,
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_Unwind_Word __value) {
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_Unwind_VRS_Set(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value);
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}
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static __inline__
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_Unwind_Word _Unwind_GetIP(struct _Unwind_Context *__context) {
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_Unwind_Word __ip = _Unwind_GetGR(__context, 15);
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return __ip & ~(_Unwind_Word)(0x1); /* Remove thumb mode bit. */
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}
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static __inline__
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void _Unwind_SetIP(struct _Unwind_Context *__context, _Unwind_Word __value) {
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_Unwind_Word __thumb_mode_bit = _Unwind_GetGR(__context, 15) & 0x1;
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_Unwind_SetGR(__context, 15, __value | __thumb_mode_bit);
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}
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#else
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_Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int);
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void _Unwind_SetGR(struct _Unwind_Context *, int, _Unwind_Word);
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_Unwind_Word _Unwind_GetIP(struct _Unwind_Context *);
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void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Word);
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#endif
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_Unwind_Word _Unwind_GetIPInfo(struct _Unwind_Context *, int *);
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_Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *);
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_Unwind_Word _Unwind_GetBSP(struct _Unwind_Context *);
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void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *);
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_Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *);
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/* DWARF EH functions; currently not available on Darwin/ARM */
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#if !defined(__APPLE__) || !defined(__arm__)
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_Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception *);
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_Unwind_Reason_Code _Unwind_ForcedUnwind(struct _Unwind_Exception *,
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_Unwind_Stop_Fn, void *);
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void _Unwind_DeleteException(struct _Unwind_Exception *);
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void _Unwind_Resume(struct _Unwind_Exception *);
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_Unwind_Reason_Code _Unwind_Resume_or_Rethrow(struct _Unwind_Exception *);
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#endif
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_Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *);
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/* setjmp(3)/longjmp(3) stuff */
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typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t;
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void _Unwind_SjLj_Register(_Unwind_FunctionContext_t);
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void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t);
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_Unwind_Reason_Code _Unwind_SjLj_RaiseException(struct _Unwind_Exception *);
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_Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(struct _Unwind_Exception *,
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_Unwind_Stop_Fn, void *);
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void _Unwind_SjLj_Resume(struct _Unwind_Exception *);
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_Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *);
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void *_Unwind_FindEnclosingFunction(void *);
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#ifdef __APPLE__
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_Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *)
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__attribute__((unavailable));
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_Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *)
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__attribute__((unavailable));
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/* Darwin-specific functions */
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void __register_frame(const void *);
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void __deregister_frame(const void *);
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struct dwarf_eh_bases {
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uintptr_t tbase;
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uintptr_t dbase;
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uintptr_t func;
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};
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void *_Unwind_Find_FDE(const void *, struct dwarf_eh_bases *);
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void __register_frame_info_bases(const void *, void *, void *, void *)
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__attribute__((unavailable));
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void __register_frame_info(const void *, void *) __attribute__((unavailable));
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void __register_frame_info_table_bases(const void *, void*, void *, void *)
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__attribute__((unavailable));
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void __register_frame_info_table(const void *, void *)
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__attribute__((unavailable));
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void __register_frame_table(const void *) __attribute__((unavailable));
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void __deregister_frame_info(const void *) __attribute__((unavailable));
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void __deregister_frame_info_bases(const void *)__attribute__((unavailable));
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#else
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_Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *);
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_Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *);
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#endif
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility pop
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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#endif /* __CLANG_UNWIND_H */
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