e369a989fc
libunwind defines the _Unwind_* ABI used by libc++abi. This ABI is a stable quasi-standard common between multiple implementations such as LLVM and GNU. The _U* symbol name space is also safely within the symbol name space that standard C & C++ reserve for the implementation. Futhermore, libunwind also defines several unw_* symbols, and references these from the _Unwind_* entry points so the standard/reserved part of the ABI is dependent on the unw_* part of the ABI. This is not OK for a C or C++ implementation. The unw_* symbols are reserved for C and extern "C" used by application code. This change renames each unw_* function to __unw* and adds a weak alias unw_* to keep the public <libunwind.h> ABI unchanged for backwards compatibility. Every reference to unw_* in the implementation has been changed to use __unw* so that if other unw_* definitions are in force because nothing uses <libunwind.h> in a particular program, no _Unwind* code path depends on any unw_* symbol. Furthemore, __unw_* symbols are hidden, which saves PLT overhead in the shared library case. In the future, we should cconsider untangling the unw_* API/ABI from the _Unwind_* API/ABI. The internal API backing the _Unwind_* ABI implementation should not rely on any nonstandard symbols not in the implementation-reserved name space. This would then allow separating the _Unwind_* API/ABI from unw_* entirely, but that's a more substantial change that's going to require more significant refactoring. Differential Revision: https://reviews.llvm.org/D59921 llvm-svn: 357640
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
//===------------------------ libunwind_ext.h -----------------------------===//
|
|
//
|
|
// 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
|
|
//
|
|
//
|
|
// Extensions to libunwind API.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef __LIBUNWIND_EXT__
|
|
#define __LIBUNWIND_EXT__
|
|
|
|
#include "config.h"
|
|
#include <libunwind.h>
|
|
#include <unwind.h>
|
|
|
|
#define UNW_STEP_SUCCESS 1
|
|
#define UNW_STEP_END 0
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
extern int __unw_getcontext(unw_context_t *);
|
|
extern int __unw_init_local(unw_cursor_t *, unw_context_t *);
|
|
extern int __unw_step(unw_cursor_t *);
|
|
extern int __unw_get_reg(unw_cursor_t *, unw_regnum_t, unw_word_t *);
|
|
extern int __unw_get_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t *);
|
|
extern int __unw_set_reg(unw_cursor_t *, unw_regnum_t, unw_word_t);
|
|
extern int __unw_set_fpreg(unw_cursor_t *, unw_regnum_t, unw_fpreg_t);
|
|
extern int __unw_resume(unw_cursor_t *);
|
|
|
|
#ifdef __arm__
|
|
/* Save VFP registers in FSTMX format (instead of FSTMD). */
|
|
extern void __unw_save_vfp_as_X(unw_cursor_t *);
|
|
#endif
|
|
|
|
extern const char *__unw_regname(unw_cursor_t *, unw_regnum_t);
|
|
extern int __unw_get_proc_info(unw_cursor_t *, unw_proc_info_t *);
|
|
extern int __unw_is_fpreg(unw_cursor_t *, unw_regnum_t);
|
|
extern int __unw_is_signal_frame(unw_cursor_t *);
|
|
extern int __unw_get_proc_name(unw_cursor_t *, char *, size_t, unw_word_t *);
|
|
|
|
// SPI
|
|
extern void __unw_iterate_dwarf_unwind_cache(void (*func)(
|
|
unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh));
|
|
|
|
// IPI
|
|
extern void __unw_add_dynamic_fde(unw_word_t fde);
|
|
extern void __unw_remove_dynamic_fde(unw_word_t fde);
|
|
|
|
#if defined(_LIBUNWIND_ARM_EHABI)
|
|
extern const uint32_t* decode_eht_entry(const uint32_t*, size_t*, size_t*);
|
|
extern _Unwind_Reason_Code _Unwind_VRS_Interpret(_Unwind_Context *context,
|
|
const uint32_t *data,
|
|
size_t offset, size_t len);
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // __LIBUNWIND_EXT__
|