tree 04c04ac544f15721ce76c203f927eb0a48976adf
parent 23a87716b57114e9b4f607042e3ec1af90d68c0a
author Vic Yang <victoryang@google.com> 1565121524 -0700
committer Vic Yang <victoryang@google.com> 1565373697 -0700

libutils: Introduce StaticString16

This is a backward compatible implementation of compile time
constructed String16 support.

As much as we'd like a regular constexpr constructor for String16, we
want to make sure the regular non-static String16 does not regress.
We also need to make sure prebuilts built with previous version of
String16 still works with new libutils.  This means we cannot change
the size of String16 objects and we cannot make anything virtual.

To add a flag to indicate whether a String16 is static without
increasing the size of non-static String16 objects, we repurpose a
reserved field in SharedBuffer as "for client use".  With this, we can
tag every String16 and perform memory operation differently based on
how the underlying buffers are allocated.

By using StaticString16, we are able to eliminate the runtime
construction of a String16 and move it out of .bss section.

Bug: 138856262
Test: Run newly added unit tests.
Change-Id: I72bb8dc27a59b9ef34e0d934bc1e00b0f675855a