commit 00c1c45229e4b552c69566ad382614a7ad222f9b
author Ryan Prichard <rprichard@google.com> Wed Sep 16 01:22:55 2020 -0700
committer Copybara-Service <copybara-worker@google.com> Thu Oct 29 18:05:42 2020 -0700
tree 6da47ceb78e25642946ad11852c0d9b96ea4fcd5
parent b65e9ca87485426ddb3070fffe25f1641a806394

[libunwind][DWARF] Fix end of .eh_frame calculation

 * When .eh_frame is located using .eh_frame_hdr (PT_GNU_EH_FRAME), the
   start of .eh_frame is known, but not the size. In this case, the
   unwinder must rely on a terminator present at the end of .eh_frame.
   Set dwarf_section_length to UINTPTR_MAX to indicate this.

 * Add a new field, text_segment_length, that the FrameHeaderCache uses
   to track the size of the PT_LOAD segment indicated by dso_base.

 * Compute ehSectionEnd by adding sectionLength to ehSectionStart,
   never to fdeHint.

Fixes PR46829.

Differential Revision: https://reviews.llvm.org/D87750

GitOrigin-RevId: fb1abe00635c1ec28e55921709904d5ca2e86a74