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Author SHA1 Message Date
Georgii Rymar 51f4958057 [yaml2obj/obj2yaml] - Improve dumping/creating of ELF versioning sections. 
This makes the following improvements.

For `SHT_GNU_versym`:
 * yaml2obj: set `sh_link` to index of `.dynsym` section automatically.
For `SHT_GNU_verdef`:
 * yaml2obj: set `sh_link` to index of `.dynstr` section automatically.
 * yaml2obj: set `sh_info` field automatically.
 * obj2yaml: don't dump the `Info` field when its value matches the number of version definitions.
For `SHT_GNU_verneed`:
 * yaml2obj: set `sh_link` to index of `.dynstr` section automatically.
 * yaml2obj: set `sh_info` field automatically.
 * obj2yaml: don't dump the `Info` field when its value matches the number of version dependencies.

Also, simplifies few test cases.

Differential revision: https://reviews.llvm.org/D94956
 2021-01-21 10:36:48 +03:00
Fangrui Song b8a3c618d6 [ELF] Allow misaligned SHT_GNU_verneed 
Bazel created interface shared objects (.ifso) may be misaligned.  We use
llvm::support::detail::packed_endian_specific_integral under the hood
which allows reading of misaligned values, so there is not a need to
diagnose (in LLD we don't intend to support sophisticated parsing for
SHT_GNU_*).
 2020-05-26 11:18:19 -07:00