tree 326d083ed2071089e46a87174fbb9065cb9cfd3d
parent 85f5a4449cbb13205ceeaf5f3cb04759a40169f8
author Christopher Ferris <cferris@google.com> 1572369671 -0700
committer Christopher Ferris <cferris@google.com> 1572399570 -0700

Fix potential bad info in eh_frame_hdr.

Due to a bug, an elf can have FDEs with a length of zero, while still
having another FDE for the same pc with a non-zero length. The
eh_frame_hdr can sometimes point to the zero length FDE, but it should
have pointed to the non-zero length FDE. In order to fix this, if the
eh_frame_hdr points at the zero length FDE then try and find the real FDE
directly from eh_frame.

The change cleans up and removes unused variables from DwarfEhFrameWithHdr
and changes the objects so that all of the DwarfSection objects and
DwarfEhFrameWithHdr object inherit from the same class.

Add new unit tests to verify this functionality.

Bug: 142483624

Test: Unit tests all pass.
Change-Id: I128a916e3ba378931de7d44ee15e57e24d4073df