tree 62732f2636dd1b34374e499b01880ede276314a7
parent 8dc3f941131332dd240b12fea422c06e0af51572
author David Srbecky <dsrbecky@google.com> 1521063025 +0000
committer Christopher Ferris <cferris@google.com> 1522338469 -0700

Cache DWARF location rules for a given pc.

Decoding the DWARF opcodes is expensive so make sure we cache it.

This speeds unwinding in simpleperf by over a factor of 3x.

Add unit tests for this new behavior.

Bug: 77258731

Test: libbacktrace/libunwindstack unit tests on host and target.
Test: Ran debuggerd -b on various processes on target.
Change-Id: Ia516c0fa5d3e5f76746190bb4b6fdf49fd1c9388
(cherry picked from commit 3386ebade2d28fd3ef68c576bb0375bd226a1320)