[PATCH] D23352: [ELF] - Linkerscript: implemented simple heuristic for placing orphan sections.

George Rimar via llvm-commits llvm-commits at lists.llvm.org
Tue Aug 30 07:18:50 PDT 2016

grimar added a comment.

In https://reviews.llvm.org/D23352#528358, @ruiu wrote:

> Please ping me again once https://reviews.llvm.org/D23866 has landed.

It seems that it will never be landed. If we decide to go with multiple output sections solution so support SHT_MERGE,
there is no more point to do https://reviews.llvm.org/D23866.
So this patch is still uses Factory, what is looks what we want.

Comment at: ELF/LinkerScript.cpp:290
@@ +289,3 @@
+  auto R = std::find_if(
+      ScriptConfig->Commands.rbegin(), ScriptConfig->Commands.rend(),
+      [&](std::unique_ptr<BaseCommand> &Base) {
ruiu wrote:
> Why rbegin and rend? If it doesn't have to be rbegin/rend, use begin/end.
I am searching the last section with the same access attributes to place orphan right after. So I had to search from the end to start.

Comment at: ELF/LinkerScript.cpp:302
@@ +301,3 @@
+  // with the same attributes we found earlier.
+  auto Pos = R != ScriptConfig->Commands.rend() ? R.base()
+                                                : ScriptConfig->Commands.end();
ruiu wrote:
> What is `base()`?
base() converts reverse iterator to regular:


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