[PATCH] D123469: [DebugInfo][llvm-dwarfutil] Combine overlapped address ranges.

Wed Apr 20 12:06:43 PDT 2022

avl added a comment.

In D123469#3462423 <https://reviews.llvm.org/D123469#3462423>, @dblaikie wrote:

> Do you have a small/standalone lto example of these overlapped ranges - to understand both why they happen, and why they're invalid?

I do not have at the moment. The issue was raised by @clayborg https://reviews.llvm.org/D86539#3428098 . But I will try to reproduce.
That is the explanation:

This can happen when you have LTO mess with the debug info as many functions might end up being combined. I have a command that dumps the ranges of DIEs and the problem looks like this:

  DIE OFFSET RANGE                                     NAME
  ========== ========================================= ====================
  0x0000e88e [0x0000000000028454 - 0x0000000000028474) freep
  0x0000e8c2 [0x0000000000028454 - 0x0000000000028474) freep_aligned
  0x00022cf4 [0x0000000000028454 - 0x0000000000028474) freep
  0x00022d5d [0x0000000000028454 - 0x0000000000028474) freep_aligned

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123469/new/

https://reviews.llvm.org/D123469