ART: Store classpath information into oat file

Store a "dependency list" of class-path dex-files into the key-value
store of an oat file. The list is made up of dex locations and
corresponding checksums.

Add tests for encoding, decoding and checking the list.

Bug: 19781184
Change-Id: Ie700dd37e6e086db599c95d329ac1f1d2ff0b758

1 files changed, 5 insertions, 0 deletions

diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index eda7ec6..7e32b43 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -1237,6 +1237,11 @@ class Dex2Oat FINAL {
       for (auto& class_path_file : class_path_files_) {
         class_path_files.push_back(class_path_file.get());
       }
+
+      // Store the classpath we have right now.
+      key_value_store_->Put(OatHeader::kClassPathKey,
+                            OatFile::EncodeDexFileDependencies(class_path_files));
+
       // Then the dex files we'll compile. Thus we'll resolve the class-path first.
       class_path_files.insert(class_path_files.end(), dex_files_.begin(), dex_files_.end());