include/mach-o/compact_unwind_encoding.h

99 // For x86 there are four modes for the compact unwind encoding:
113 //    unwind encoding) is added to the ESP. Then the return is done by
124 //    large to encode in the compact unwind encoding.  Instead it requires that
126 //    encoding contains the offset to the nnnnnnnn value in the function in
129 //    No compact unwind encoding is available.  Instead the low 24-bits of the
130 //    compact encoding is the offset of the DWARF FDE in the __eh_frame section.
135 // The permutation encoding is a Lehmer code sequence encoded into a
139 // The following is the algorithm used to create the permutation encoding used
233 // For x86_64 there are four modes for the compact unwind encoding:
247 //    unwind encoding) is added to the RSP. Then the return is done by
258 //    large to encode in the compact unwind encoding.  Instead it requires that
260 //    encoding contains the offset to the nnnnnnnn value in the function in
263 //    No compact unwind encoding is available.  Instead the low 24-bits of the
264 //    compact encoding is the offset of the DWARF FDE in the __eh_frame section.
305 // For arm64 there are three modes for the compact unwind encoding:
321 //    No compact unwind encoding is available.  Instead the low 24-bits of the
322 //    compact encoding is the offset of the DWARF FDE in the __eh_frame section.
348 //     compact-unwind-encoding   32-bit encoding
352 // The length and encoding fields are 32-bits.  The other are all pointer sized.
440 // if too many different encoding types are used.  The regular page holds
447     compact_unwind_encoding_t    encoding;