There are 8935901 *ninjaString objects generated in an AOSP
aosp_blueline-userdebug build, and 7865180 of those are a literal
string with no ninja variables.
Each of those *ninjaString objects takes a minimum of 48 bytes for
2 slices, plus 8 bytes for the pointer to the ninjaString. For
the literal string case, one of those slices has a single element,
(costing another 16 bytes for the backing array), and the other
slice is empty, for a total of 72 bytes.
Replace *ninjaString with a ninjaString interface. This increases
the size of the reference from 8 bytes to 16 bytes, but using
a type alias of a string for the literal string implementation uses
only 16 bytes, saving 40 bytes per literal string or 314 MB.
Test: ninja_strings_test
Change-Id: Ic5fe16ed1f2a244fe6a8ccdf762919634d825cbe
Turn PackageContext into an interface so that build systems can wrap it
to add more custom helpers.
This does introduce an API change, though it should be fairly simple.
NewPackageContext used to provide an opaque *PackageContext struct, now it
provides a PackageContext interface.
Change-Id: I383c64a303d857ef5e0dec86ad77f791ba4c9639
Make integrating with go tools easier by putting the blueprint package
files in the top level directory of the git project instead of in a
subdirectory called blueprint.
Change-Id: I35c144c5fe7ddf34e478d0c47c50b2f6c92c2a03
