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/*===---- unwind.h - Stack unwinding ----------------------------------------===
*
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*
*===-----------------------------------------------------------------------===
*/
/* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/
#ifndef __CLANG_UNWIND_H
#define __CLANG_UNWIND_H
#if defined(__APPLE__) && __has_include_next(<unwind.h>)
/* Darwin (from 11.x on) provide an unwind.h. If that's available,
* use it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE,
* so define that around the include.*/
# ifndef _GNU_SOURCE
# define _SHOULD_UNDEFINE_GNU_SOURCE
# define _GNU_SOURCE
# endif
// libunwind's unwind.h reflects the current visibility. However, Mozilla
// builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the
// visibility to default and export its contents. gcc also allows users to
// override its override by #defining HIDE_EXPORTS (but note, this only obeys
// the user's -fvisibility setting; it doesn't hide any exports on its own). We
// imitate gcc's header here:
# ifdef HIDE_EXPORTS
# include_next <unwind.h>
# else
# pragma GCC visibility push(default)
# include_next <unwind.h>
# pragma GCC visibility pop
# endif
# ifdef _SHOULD_UNDEFINE_GNU_SOURCE
# undef _GNU_SOURCE
# undef _SHOULD_UNDEFINE_GNU_SOURCE
# endif
#else
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/* It is a bit strange for a header to play with the visibility of the
symbols it declares, but this matches gcc's behavior and some programs
depend on it */
#ifndef HIDE_EXPORTS
#pragma GCC visibility push(default)
#endif
typedef uintptr_t _Unwind_Word __attribute__((__mode__(__unwind_word__)));
typedef intptr_t _Unwind_Sword __attribute__((__mode__(__unwind_word__)));
typedef uintptr_t _Unwind_Ptr;
typedef uintptr_t _Unwind_Internal_Ptr;
typedef uint64_t _Unwind_Exception_Class;
typedef intptr_t _sleb128_t;
typedef uintptr_t _uleb128_t;
struct _Unwind_Context;
#if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || \
defined(__ARM_DWARF_EH__) || defined(__SEH__))
struct _Unwind_Control_Block;
typedef struct _Unwind_Control_Block _Unwind_Control_Block;
#define _Unwind_Exception _Unwind_Control_Block /* Alias */
#else
struct _Unwind_Exception;
typedef struct _Unwind_Exception _Unwind_Exception;
#endif
typedef enum {
_URC_NO_REASON = 0,
#if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
!defined(__ARM_DWARF_EH__) && !defined(__SEH__)
_URC_OK = 0, /* used by ARM EHABI */
#endif
_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
_URC_FATAL_PHASE2_ERROR = 2,
_URC_FATAL_PHASE1_ERROR = 3,
_URC_NORMAL_STOP = 4,
_URC_END_OF_STACK = 5,
_URC_HANDLER_FOUND = 6,
_URC_INSTALL_CONTEXT = 7,
_URC_CONTINUE_UNWIND = 8,
#if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
!defined(__ARM_DWARF_EH__) && !defined(__SEH__)
_URC_FAILURE = 9 /* used by ARM EHABI */
#endif
} _Unwind_Reason_Code;
typedef enum {
_UA_SEARCH_PHASE = 1,
_UA_CLEANUP_PHASE = 2,
_UA_HANDLER_FRAME = 4,
_UA_FORCE_UNWIND = 8,
_UA_END_OF_STACK = 16 /* gcc extension to C++ ABI */
} _Unwind_Action;
typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code,
_Unwind_Exception *);
#if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || \
defined(__ARM_DWARF_EH__) || defined(__SEH__))
typedef struct _Unwind_Control_Block _Unwind_Control_Block;
typedef uint32_t _Unwind_EHT_Header;
struct _Unwind_Control_Block {
uint64_t exception_class;
void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
/* unwinder cache (private fields for the unwinder's use) */
struct {
uint32_t reserved1; /* forced unwind stop function, 0 if not forced */
uint32_t reserved2; /* personality routine */
uint32_t reserved3; /* callsite */
uint32_t reserved4; /* forced unwind stop argument */
uint32_t reserved5;
} unwinder_cache;
/* propagation barrier cache (valid after phase 1) */
struct {
uint32_t sp;
uint32_t bitpattern[5];
} barrier_cache;
/* cleanup cache (preserved over cleanup) */
struct {
uint32_t bitpattern[4];
} cleanup_cache;
/* personality cache (for personality's benefit) */
struct {
uint32_t fnstart; /* function start address */
_Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */
uint32_t additional; /* additional data */
uint32_t reserved1;
} pr_cache;
long long int : 0; /* force alignment of next item to 8-byte boundary */
} __attribute__((__aligned__(8)));
#else
struct _Unwind_Exception {
_Unwind_Exception_Class exception_class;
_Unwind_Exception_Cleanup_Fn exception_cleanup;
#if !defined (__USING_SJLJ_EXCEPTIONS__) && defined (__SEH__)
_Unwind_Word private_[6];
#else
_Unwind_Word private_1;
_Unwind_Word private_2;
#endif
/* The Itanium ABI requires that _Unwind_Exception objects are "double-word
* aligned". GCC has interpreted this to mean "use the maximum useful
* alignment for the target"; so do we. */
} __attribute__((__aligned__));
#endif
typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action,
_Unwind_Exception_Class,
_Unwind_Exception *,
struct _Unwind_Context *,
void *);
typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(int, _Unwind_Action,
_Unwind_Exception_Class,
_Unwind_Exception *,
struct _Unwind_Context *);
typedef _Unwind_Personality_Fn __personality_routine;
typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *,
void *);
#if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || \
defined(__ARM_DWARF_EH__) || defined(__SEH__))
typedef enum {
_UVRSC_CORE = 0, /* integer register */
_UVRSC_VFP = 1, /* vfp */
_UVRSC_WMMXD = 3, /* Intel WMMX data register */
_UVRSC_WMMXC = 4, /* Intel WMMX control register */
_UVRSC_PSEUDO = 5 /* Special purpose pseudo register */
} _Unwind_VRS_RegClass;
typedef enum {
_UVRSD_UINT32 = 0,
_UVRSD_VFPX = 1,
_UVRSD_UINT64 = 3,
_UVRSD_FLOAT = 4,
_UVRSD_DOUBLE = 5
} _Unwind_VRS_DataRepresentation;
typedef enum {
_UVRSR_OK = 0,
_UVRSR_NOT_IMPLEMENTED = 1,
_UVRSR_FAILED = 2
} _Unwind_VRS_Result;
typedef uint32_t _Unwind_State;
#define _US_VIRTUAL_UNWIND_FRAME ((_Unwind_State)0)
#define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1)
#define _US_UNWIND_FRAME_RESUME ((_Unwind_State)2)
#define _US_ACTION_MASK ((_Unwind_State)3)
#define _US_FORCE_UNWIND ((_Unwind_State)8)
_Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context,
_Unwind_VRS_RegClass __regclass,
uint32_t __regno,
_Unwind_VRS_DataRepresentation __representation,
void *__valuep);
_Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *__context,
_Unwind_VRS_RegClass __regclass,
uint32_t __regno,
_Unwind_VRS_DataRepresentation __representation,
void *__valuep);
static __inline__
_Unwind_Word _Unwind_GetGR(struct _Unwind_Context *__context, int __index) {
_Unwind_Word __value;
_Unwind_VRS_Get(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value);
return __value;
}
static __inline__
void _Unwind_SetGR(struct _Unwind_Context *__context, int __index,
_Unwind_Word __value) {
_Unwind_VRS_Set(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value);
}
static __inline__
_Unwind_Word _Unwind_GetIP(struct _Unwind_Context *__context) {
_Unwind_Word __ip = _Unwind_GetGR(__context, 15);
return __ip & ~(_Unwind_Word)(0x1); /* Remove thumb mode bit. */
}
static __inline__
void _Unwind_SetIP(struct _Unwind_Context *__context, _Unwind_Word __value) {
_Unwind_Word __thumb_mode_bit = _Unwind_GetGR(__context, 15) & 0x1;
_Unwind_SetGR(__context, 15, __value | __thumb_mode_bit);
}
#else
_Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int);
void _Unwind_SetGR(struct _Unwind_Context *, int, _Unwind_Word);
_Unwind_Word _Unwind_GetIP(struct _Unwind_Context *);
void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Word);
#endif
_Unwind_Word _Unwind_GetIPInfo(struct _Unwind_Context *, int *);
_Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *);
_Unwind_Word _Unwind_GetBSP(struct _Unwind_Context *);
void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *);
_Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *);
/* DWARF EH functions; currently not available on Darwin/ARM */
#if !defined(__APPLE__) || !defined(__arm__)
_Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception *);
_Unwind_Reason_Code _Unwind_ForcedUnwind(_Unwind_Exception *, _Unwind_Stop_Fn,
void *);
void _Unwind_DeleteException(_Unwind_Exception *);
void _Unwind_Resume(_Unwind_Exception *);
_Unwind_Reason_Code _Unwind_Resume_or_Rethrow(_Unwind_Exception *);
#endif
_Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *);
/* setjmp(3)/longjmp(3) stuff */
typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t;
void _Unwind_SjLj_Register(_Unwind_FunctionContext_t);
void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t);
_Unwind_Reason_Code _Unwind_SjLj_RaiseException(_Unwind_Exception *);
_Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *,
_Unwind_Stop_Fn, void *);
void _Unwind_SjLj_Resume(_Unwind_Exception *);
_Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *);
void *_Unwind_FindEnclosingFunction(void *);
#ifdef __APPLE__
_Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *)
__attribute__((__unavailable__));
_Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *)
__attribute__((__unavailable__));
/* Darwin-specific functions */
void __register_frame(const void *);
void __deregister_frame(const void *);
struct dwarf_eh_bases {
uintptr_t tbase;
uintptr_t dbase;
uintptr_t func;
};
void *_Unwind_Find_FDE(const void *, struct dwarf_eh_bases *);
void __register_frame_info_bases(const void *, void *, void *, void *)
__attribute__((__unavailable__));
void __register_frame_info(const void *, void *) __attribute__((__unavailable__));
void __register_frame_info_table_bases(const void *, void*, void *, void *)
__attribute__((__unavailable__));
void __register_frame_info_table(const void *, void *)
__attribute__((__unavailable__));
void __register_frame_table(const void *) __attribute__((__unavailable__));
void __deregister_frame_info(const void *) __attribute__((__unavailable__));
void __deregister_frame_info_bases(const void *)__attribute__((__unavailable__));
#else
_Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *);
_Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *);
#endif
#ifndef HIDE_EXPORTS
#pragma GCC visibility pop
#endif
#ifdef __cplusplus
}
#endif
#endif
#endif /* __CLANG_UNWIND_H */