3 Commits

Author	SHA1	Message	Date
Fangrui Song	b6772b86e2	[ELF] Move `// REQUIRES:` line to the top ... llvm-svn: 335676	2018-06-26 22:20:04 +00:00
Peter Smith	3c73a41128	[ELF] Optimize Arm PLT sequences ... A more efficient PLT sequence can be used when the distance between the .plt and the end of the .plt.got is less than 128 Megabytes, which is frequently true. We fall back to the old sequence when the offset is larger than 128 Megabytes. This gives us an alternative to forcing the longer entries with --long-plt as we gracefully fall back to it as needed. See ELF for the ARM Architecture Appendix A for details of the PLT sequence. Differential Revision: https://reviews.llvm.org/D41246 llvm-svn: 320987	2017-12-18 14:46:27 +00:00
Peter Smith	2809926c4d	[ELF][ARM] Refine check for when undefined weak needs a Thunk ... When an undefined weak reference has a PLT entry we must generate a range extension thunk for any B or BL that can't reach the PLT entry. This change explicitly looks for whether a PLT entry exists rather than assuming that weak references never need PLT entries unless Config->Shared is in operation. This covers the case where we are linking an executable with dynamic linking, hence a PLT entry will be needed for undefined weak references. This case comes up in real programs over 32 Mb in size as there is a B to a weak reference __gmon__start__ in the Arm crti.o for glibc. Differential Revision: https://reviews.llvm.org/D40248 llvm-svn: 319020	2017-11-27 11:49:18 +00:00