unwind.h revision 347124d34566c4fef5a1673a30638e23304ba865
1/*===---- unwind.h - Stack unwinding ----------------------------------------=== 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to deal 5 * in the Software without restriction, including without limitation the rights 6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 * copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19 * THE SOFTWARE. 20 * 21 *===-----------------------------------------------------------------------=== 22 */ 23 24/* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/ 25 26#ifndef __CLANG_UNWIND_H 27#define __CLANG_UNWIND_H 28 29#if __has_include_next(<unwind.h>) 30/* Darwin (from 11.x on) and libunwind provide an unwind.h. If that's available, 31 * use it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE, 32 * so define that around the include.*/ 33# ifndef _GNU_SOURCE 34# define _SHOULD_UNDEFINE_GNU_SOURCE 35# define _GNU_SOURCE 36# endif 37// libunwind's unwind.h reflects the current visibility. However, Mozilla 38// builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the 39// visibility to default and export its contents. gcc also allows users to 40// override its override by #defining HIDE_EXPORTS (but note, this only obeys 41// the user's -fvisibility setting; it doesn't hide any exports on its own). We 42// imitate gcc's header here: 43# ifdef HIDE_EXPORTS 44# include_next <unwind.h> 45# else 46# pragma GCC visibility push(default) 47# include_next <unwind.h> 48# pragma GCC visibility pop 49# endif 50# ifdef _SHOULD_UNDEFINE_GNU_SOURCE 51# undef _GNU_SOURCE 52# undef _SHOULD_UNDEFINE_GNU_SOURCE 53# endif 54#else 55 56#include <stdint.h> 57 58#ifdef __cplusplus 59extern "C" { 60#endif 61 62/* It is a bit strange for a header to play with the visibility of the 63 symbols it declares, but this matches gcc's behavior and some programs 64 depend on it */ 65#ifndef HIDE_EXPORTS 66#pragma GCC visibility push(default) 67#endif 68 69typedef uintptr_t _Unwind_Word; 70typedef intptr_t _Unwind_Sword; 71typedef uintptr_t _Unwind_Ptr; 72typedef uintptr_t _Unwind_Internal_Ptr; 73typedef uint64_t _Unwind_Exception_Class; 74 75typedef intptr_t _sleb128_t; 76typedef uintptr_t _uleb128_t; 77 78struct _Unwind_Context; 79struct _Unwind_Exception; 80typedef enum { 81 _URC_NO_REASON = 0, 82 _URC_FOREIGN_EXCEPTION_CAUGHT = 1, 83 84 _URC_FATAL_PHASE2_ERROR = 2, 85 _URC_FATAL_PHASE1_ERROR = 3, 86 _URC_NORMAL_STOP = 4, 87 88 _URC_END_OF_STACK = 5, 89 _URC_HANDLER_FOUND = 6, 90 _URC_INSTALL_CONTEXT = 7, 91 _URC_CONTINUE_UNWIND = 8 92} _Unwind_Reason_Code; 93 94typedef enum { 95 _UA_SEARCH_PHASE = 1, 96 _UA_CLEANUP_PHASE = 2, 97 98 _UA_HANDLER_FRAME = 4, 99 _UA_FORCE_UNWIND = 8, 100 _UA_END_OF_STACK = 16 /* gcc extension to C++ ABI */ 101} _Unwind_Action; 102 103typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code, 104 struct _Unwind_Exception *); 105 106struct _Unwind_Exception { 107 _Unwind_Exception_Class exception_class; 108 _Unwind_Exception_Cleanup_Fn exception_cleanup; 109 _Unwind_Word private_1; 110 _Unwind_Word private_2; 111 /* The Itanium ABI requires that _Unwind_Exception objects are "double-word 112 * aligned". GCC has interpreted this to mean "use the maximum useful 113 * alignment for the target"; so do we. */ 114} __attribute__((__aligned__)); 115 116typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action, 117 _Unwind_Exception_Class, 118 struct _Unwind_Exception *, 119 struct _Unwind_Context *, 120 void *); 121 122typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)( 123 int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *, 124 struct _Unwind_Context *); 125typedef _Unwind_Personality_Fn __personality_routine; 126 127typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *, 128 void *); 129 130#ifdef __arm__ 131 132typedef enum { 133 _UVRSC_CORE = 0, /* integer register */ 134 _UVRSC_VFP = 1, /* vfp */ 135 _UVRSC_WMMXD = 3, /* Intel WMMX data register */ 136 _UVRSC_WMMXC = 4 /* Intel WMMX control register */ 137} _Unwind_VRS_RegClass; 138 139typedef enum { 140 _UVRSD_UINT32 = 0, 141 _UVRSD_VFPX = 1, 142 _UVRSD_UINT64 = 3, 143 _UVRSD_FLOAT = 4, 144 _UVRSD_DOUBLE = 5 145} _Unwind_VRS_DataRepresentation; 146 147typedef enum { 148 _UVRSR_OK = 0, 149 _UVRSR_NOT_IMPLEMENTED = 1, 150 _UVRSR_FAILED = 2 151} _Unwind_VRS_Result; 152 153_Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context, 154 _Unwind_VRS_RegClass __regclass, 155 uint32_t __regno, 156 _Unwind_VRS_DataRepresentation __representation, 157 void *__valuep); 158 159#endif 160 161_Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int); 162void _Unwind_SetGR(struct _Unwind_Context *, int, _Unwind_Word); 163 164_Unwind_Word _Unwind_GetIP(struct _Unwind_Context *); 165_Unwind_Word _Unwind_GetIPInfo(struct _Unwind_Context *, int *); 166void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Word); 167 168_Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *); 169 170void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *); 171 172_Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *); 173 174/* DWARF EH functions; currently not available on Darwin/ARM */ 175#if !defined(__APPLE__) || !defined(__arm__) 176 177_Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception *); 178_Unwind_Reason_Code _Unwind_ForcedUnwind(struct _Unwind_Exception *, 179 _Unwind_Stop_Fn, void *); 180void _Unwind_DeleteException(struct _Unwind_Exception *); 181void _Unwind_Resume(struct _Unwind_Exception *); 182_Unwind_Reason_Code _Unwind_Resume_or_Rethrow(struct _Unwind_Exception *); 183 184#endif 185 186_Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *); 187 188/* setjmp(3)/longjmp(3) stuff */ 189typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t; 190 191void _Unwind_SjLj_Register(_Unwind_FunctionContext_t); 192void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t); 193_Unwind_Reason_Code _Unwind_SjLj_RaiseException(struct _Unwind_Exception *); 194_Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(struct _Unwind_Exception *, 195 _Unwind_Stop_Fn, void *); 196void _Unwind_SjLj_Resume(struct _Unwind_Exception *); 197_Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *); 198 199void *_Unwind_FindEnclosingFunction(void *); 200 201#ifdef __APPLE__ 202 203_Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *) 204 __attribute__((unavailable)); 205_Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *) 206 __attribute__((unavailable)); 207 208/* Darwin-specific functions */ 209void __register_frame(const void *); 210void __deregister_frame(const void *); 211 212struct dwarf_eh_bases { 213 uintptr_t tbase; 214 uintptr_t dbase; 215 uintptr_t func; 216}; 217void *_Unwind_Find_FDE(const void *, struct dwarf_eh_bases *); 218 219void __register_frame_info_bases(const void *, void *, void *, void *) 220 __attribute__((unavailable)); 221void __register_frame_info(const void *, void *) __attribute__((unavailable)); 222void __register_frame_info_table_bases(const void *, void*, void *, void *) 223 __attribute__((unavailable)); 224void __register_frame_info_table(const void *, void *) 225 __attribute__((unavailable)); 226void __register_frame_table(const void *) __attribute__((unavailable)); 227void __deregister_frame_info(const void *) __attribute__((unavailable)); 228void __deregister_frame_info_bases(const void *)__attribute__((unavailable)); 229 230#else 231 232_Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *); 233_Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *); 234 235#endif 236 237 238#ifndef HIDE_EXPORTS 239#pragma GCC visibility pop 240#endif 241 242#ifdef __cplusplus 243} 244#endif 245 246#endif 247 248#endif /* __CLANG_UNWIND_H */ 249