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Diffstat (limited to 'libunwind/src/libunwind_ext.h')
| -rw-r--r-- | libunwind/src/libunwind_ext.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/libunwind/src/libunwind_ext.h b/libunwind/src/libunwind_ext.h index fdc533cb8962..28db43a4f6ee 100644 --- a/libunwind/src/libunwind_ext.h +++ b/libunwind/src/libunwind_ext.h @@ -58,6 +58,71 @@ extern void __unw_remove_dynamic_fde(unw_word_t fde); extern void __unw_add_dynamic_eh_frame_section(unw_word_t eh_frame_start); extern void __unw_remove_dynamic_eh_frame_section(unw_word_t eh_frame_start); +#ifdef __APPLE__ + +// Holds a description of the object-format-header (if any) and unwind info +// sections for a given address: +// +// * dso_base should point to a header for the JIT'd object containing the +// given address. The header's type should match the format type that +// libunwind was compiled for (so a mach_header or mach_header_64 on Darwin). +// A value of zero indicates that no such header exists. +// +// * dwarf_section and dwarf_section_length hold the address range of a DWARF +// eh-frame section associated with the given address, if any. If the +// dwarf_section_length field is zero it indicates that no such section +// exists (and in this case dwarf_section should also be set to zero). +// +// * compact_unwind_section and compact_unwind_section_length hold the address +// range of a compact-unwind info section associated with the given address, +// if any. If the compact_unwind_section_length field is zero it indicates +// that no such section exists (and in this case compact_unwind_section +// should also be set to zero). +// +// See the unw_find_dynamic_unwind_sections type below for more details. +struct unw_dynamic_unwind_sections { + unw_word_t dso_base; + unw_word_t dwarf_section; + size_t dwarf_section_length; + unw_word_t compact_unwind_section; + size_t compact_unwind_section_length; +}; + +// Typedef for unwind-info lookup callbacks. Functions of this type can be +// registered and deregistered using __unw_add_find_dynamic_unwind_sections +// and __unw_remove_find_dynamic_unwind_sections respectively. +// +// An unwind-info lookup callback should return 1 to indicate that it found +// unwind-info for the given address, or 0 to indicate that it did not find +// unwind-info for the given address. If found, the callback should populate +// some or all of the fields of the info argument (which is guaranteed to be +// non-null with all fields zero-initialized): +typedef int (*unw_find_dynamic_unwind_sections)( + unw_word_t addr, struct unw_dynamic_unwind_sections *info); + +// Register a dynamic unwind-info lookup callback. If libunwind does not find +// unwind info for a given frame in the executable program or normal dynamic +// shared objects then it will call all registered dynamic lookup functions +// in registration order until either one of them returns true, or the end +// of the list is reached. This lookup will happen before libunwind searches +// any eh-frames registered via __register_frame or +// __unw_add_dynamic_eh_frame_section. +// +// Returns UNW_ESUCCESS for successful registrations. If the given callback +// has already been registered then UNW_EINVAL will be returned. If all +// available callback entries are in use then UNW_ENOMEM will be returned. +extern int __unw_add_find_dynamic_unwind_sections( + unw_find_dynamic_unwind_sections find_dynamic_unwind_sections); + +// Deregister a dynacim unwind-info lookup callback. +// +// Returns UNW_ESUCCESS for successful deregistrations. If the given callback +// has already been registered then UNW_EINVAL will be returned. +extern int __unw_remove_find_dynamic_unwind_sections( + unw_find_dynamic_unwind_sections find_dynamic_unwind_sections); + +#endif + #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, |