tree a113f899e4d880183a35a67d8153101e600c980d
parent 217e8cbef389bbee3fde7823b87c4b924efa8d32
author Fangrui Song <i@maskray.me> 1616087899 -0700
committer Copybara-Service <copybara-worker@google.com> 1616704374 -0700

[ELF] Change --shuffle-sections=<seed> to --shuffle-sections=<section-glob>=<seed>

`--shuffle-sections=<seed>` applies to all sections.  The new
`--shuffle-sections=<section-glob>=<seed>` makes shuffling selective.  To the
best of my knowledge, the option is only used as debugging, so just drop the
original form.

`--shuffle-sections '.init_array*=-1'` `--shuffle-sections '.fini_array*=-1'`.
reverses static constructors/destructors of the same priority.
Useful to detect some static initialization order fiasco.

`--shuffle-sections '.data*=-1'`
reverses `.data*` sections. Useful to detect unfunded pointer comparison results
of two unrelated objects.

If certain sections have an intrinsic order, the old form cannot be used.

Differential Revision: https://reviews.llvm.org/D98679

GitOrigin-RevId: 16c30c3c23ef02c0227256bb6f2005a574517de9