[PATCH] D74791: Add a --shuffle-sections option to lld

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

I think It'd be useful to add --shuffle-sections=seed, so that the result can be reproducible.

- `=0`: random seed
- `=seed`: specified seed

Making `--shuffle-sections=` work with `--symbol-ordering-file=` won't be too difficult. We can assign natural numbers to sections without a negative priority.

We actually already have some approaches to disturb the layout a bit:

- `-z noseparate-code` vs `-z separate-code` vs `-z separate-loadable-segments`: change addresses
- `INPUT [BEFORE|AFTER]`: change output section orders.

A way that disturbing the layout of input sections will also be useful.



================
Comment at: lld/ELF/Writer.cpp:1216
+  if (config->shuffleSections) {
+      std::vector<int> priorities(inputSections.size());
+      int cur_prio = -1;
----------------
Indent by 2.


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https://reviews.llvm.org/D74791