Support FDs for class loader context dex files

When compiling secondary dex files, dex2oat/dexoptanalyzer must open
all dex files in the given class loader context. However, these tools
do not have the SELinux permission to open app data files and instead
rely on installd to open them and pass file descriptors via command
line arguments.

This patch extends ClassLoaderContext::OpenDexFiles to support opening
dex files from a provided list of FDs, assuming the order corresponds
to the flattened class loader context. FDs can be passed to dex2oat/
dexoptanalyzer using a new '--class-loader-context-fds=' command line
argument. The format is a colon-separated list of integers.

dexoptanalyzer is also extended with a separate mode in which
dexopt-needed analysis is not performed, only the class loader context
is flattened and list of its dex files is printed to standard output
as a colon-separated list of paths. This mode is enabled with
'--flatten-class-loader-context' and is used by installd to obtain a
list of files it should open for dex2oat/dexoptanalyzer.

Bug: 126674985
Test: atest installd_dexopt_test
Change-Id: I46a671c90d14ad8615508c106a88ac1ee8a4ef28

0 files changed, 0 insertions, 0 deletions