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Implement --just-symbols

Authored by PkmX on Dec 15 2017, 1:07 AM.



This is based on D39348, but adds a new kind of input file JustSymbolsFile which is derived from ELFFileBase. The argument is treated as a normal input file so the case where it is the sole input works and we get to reuse some of code from ELFFileBase.

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PkmX created this revision.Dec 15 2017, 1:07 AM
ruiu added a comment.Dec 15 2017, 4:31 PM

Sorry I missed this one.


You can just call Files.push_back(createJustSymbolsFile(MBRef)) instead of calling addFile.

30 ↗(On Diff #127076)

I don't like an optional argument in general. Please avoid using it in lld.


Remove InputFile::.


Obviously you need a comment just like other code blocks.

PkmX marked 3 inline comments as done.Dec 15 2017, 8:24 PM
PkmX added inline comments.

You are right. In retrospect I should've just call that instead of adding an extra argument to addFile.


The InputFile:: is required due to the rules of two-phase lookup in C++.

PkmX marked an inline comment as done.Dec 15 2017, 8:26 PM
PkmX updated this revision to Diff 127236.Dec 15 2017, 8:29 PM
PkmX updated this revision to Diff 127237.Dec 15 2017, 8:42 PM
  • Copy symbol type, size, binding, etc, like D39348.
  • Update test cases.
PkmX updated this revision to Diff 127465.Dec 18 2017, 11:13 PM

Added a check to only allow ET_EXEC and the corresponding test.

On Tue, Dec 19, 2017 at 9:54 AM, Rafael Avila de Espindola <> wrote:

This patch allows --just-symbols to be a ET_DYN, ET_REL or ET_EXEC. Do
you need all 3? ET_REL in particular seems problematic since st_value
has a different meaning in relocatable files.

If you don't need ET_DYN or ET_REL, please reject them. If you need
them, please add a test.

ld.bfd accepts ET_EXEC and ET_REL but not ET_DYN. However I don't think this option makes much sense for ET_REL inputs so I'm restricting it to ET_EXEC for now.

PkmX updated this revision to Diff 127468.Dec 19 2017, 12:25 AM

Implement the -R option as an alias to either --rpath or --just-symbols. It is treated as latter if the argument file exists and is not a directory.

This works fine for me. Perhaps Rui should land D39348 first and then you can rebase this in terms of that to discuss the remaining features (-R alias, no input files case).

PkmX abandoned this revision.Aug 7 2018, 11:17 PM

Abandoning as this has been implemented by another commit.