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Use the plt entry as the address of some symbols

Authored by rafael on Feb 8 2016, 4:21 PM.



This is the function equivalent of a copy relocation.

Since functions are expected to change sizes, we cannot use copy relocations. In situations where one would be needed, what is done instead is:

  • Create a plt entry
  • Output an undefined symbol whose addr is the plt entry.

The dynamic linker makes sure any shared library uses the plt entry as the function address.

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rafael updated this revision to Diff 47269.Feb 8 2016, 4:21 PM
rafael retitled this revision from to Use the plt entry as the address of some symbols.
rafael updated this object.
rafael added reviewers: ruiu, atanasyan, silvas.
rafael set the repository for this revision to rL LLVM.
rafael added a subscriber: llvm-commits.
atanasyan accepted this revision.Feb 8 2016, 10:15 PM
atanasyan edited edge metadata.


Thanks for the quick fix. Unfortunately as usual supporting the same functionality for MIPS requires at least one if (Config->EMachine == EM_MIPS) statement.

This revision is now accepted and ready to land.Feb 8 2016, 10:15 PM
atanasyan closed this revision.Feb 11 2016, 6:37 AM

Closed by commit rL260224.