Load app images

Support in-place patching of the app image based on boot image
location and app oat location. Only loads for art run test so far
since we do not automatically generate app images for app installs.

N5 maps launch time (~200 runs):
Before: 930ms
After: 878.18ms
After + image class table: 864.57ms

TODO:
Oatdump support.
Store class loaders as class roots in image.

Bug: 22858531

Change-Id: I9cbc645645e62ea2ed1ad8e139e91af7d88514c1

1 files changed, 12 insertions, 0 deletions

diff --git a/runtime/oat_file_assistant.h b/runtime/oat_file_assistant.h
index f781532b14..7b45bca946 100644
--- a/runtime/oat_file_assistant.h
+++ b/runtime/oat_file_assistant.h
@@ -30,6 +30,12 @@
 
 namespace art {
 
+namespace gc {
+namespace space {
+class ImageSpace;
+}  // namespace space
+}  // namespace gc
+
 // Class for assisting with oat file management.
 //
 // This class collects common utilities for determining the status of an oat
@@ -163,6 +169,9 @@ class OatFileAssistant {
   // the OatFileAssistant object.
   std::unique_ptr<OatFile> GetBestOatFile();
 
+  // Open and returns an image space associated with the oat file.
+  gc::space::ImageSpace* OpenImageSpace(const OatFile* oat_file);
+
   // Loads the dex files in the given oat file for the given dex location.
   // The oat file should be up to date for the given dex location.
   // This loads multiple dex files in the case of multidex.
@@ -214,6 +223,9 @@ class OatFileAssistant {
   bool OatFileNeedsRelocation();
   bool OatFileIsUpToDate();
 
+  // Return image file name. Does not cache since it relies on the oat file.
+  std::string ArtFileName(const OatFile* oat_file) const;
+
   // These methods return the status for a given opened oat file with respect
   // to the dex location.
   OatStatus GivenOatFileStatus(const OatFile& file);