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[libunwind] Remove compatibility support for macOS 10.6 

Remove `_dyld_find_unwind_sections` implementation for macOS that is
10.6 or previous. 10.6 is no longer supported for TOT libunwind after
removing its libkeymgr dependency.

Reviewed By: mstorsjo, pete, #libunwind

Differential Revision: https://reviews.llvm.org/D86104
This commit is contained in:
Steven Wu 2020-08-17 14:08:50 -07:00
parent c37145cab1
commit 4cd09374cd
1 changed files with 2 additions and 36 deletions
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38
libunwind/src/AddressSpace.hpp
View File

@ -55,43 +55,9 @@ struct EHABIIndexEntry {
const void* compact_unwind_section;
uintptr_t compact_unwind_section_length;
};
#if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) \
&& (__MAC_OS_X_VERSION_MIN_REQUIRED >= 1070)) \
|| defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
// In 10.7.0 or later, libSystem.dylib implements this function.
extern "C" bool _dyld_find_unwind_sections(void *, dyld_unwind_sections *);
#else
// In 10.6.x and earlier, we need to implement this functionality. Note
// that this requires a newer version of libmacho (from cctools) than is
// present in libSystem on 10.6.x (for getsectiondata).
static inline bool _dyld_find_unwind_sections(void* addr,
dyld_unwind_sections* info) {
// Find mach-o image containing address.
Dl_info dlinfo;
if (!dladdr(addr, &dlinfo))
return false;
#if __LP64__
const struct mach_header_64 *mh = (const struct mach_header_64 *)dlinfo.dli_fbase;
#else
const struct mach_header *mh = (const struct mach_header *)dlinfo.dli_fbase;
#endif
// Initialize the return struct
info->mh = (const struct mach_header *)mh;
info->dwarf_section = getsectiondata(mh, "__TEXT", "__eh_frame", &info->dwarf_section_length);
info->compact_unwind_section = getsectiondata(mh, "__TEXT", "__unwind_info", &info->compact_unwind_section_length);
if (!info->dwarf_section) {
info->dwarf_section_length = 0;
}
if (!info->compact_unwind_section) {
info->compact_unwind_section_length = 0;
}
return true;
}
#endif
// In 10.7.0 or later, libSystem.dylib implements this function.
extern "C" bool _dyld_find_unwind_sections(void *, dyld_unwind_sections *);
#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)