tree 3c2e70664a51665e78dabba8e6bba1814a8951ca
parent c87d1ed61166d99ff8d1b5f4411056fc8ee65ee6
author Vic Yang <victoryang@google.com> 1548356426 -0800
committer Vic Yang <victoryang@google.com> 1548357075 -0800

libunwindstack: Move DwarfOp callback table to rodata section

There are currently two copies of DwarfOp callback tables in
data.rel.ro section, and that is 16KB of dirty memory per process on a
64-bit platform.

To reduce memory usage, we introduce a layer of indirection so that
all instances of DwarfOp can share a single callback table.  We also
get rid of the pointers for op names in the callback table so that the
entire table can be placed in rodata section.

Test result shows 1MB saving on cuttlefish, and 750KB saving on a Go
device (32-bit ARM).

Bug: 112073665
Test: Boot on cuttlefish and a Go device.
Change-Id: Idf90a513f37534ab1ef30d5742a9d3ea779f3661