Smarter image layout

Put strings in the dex file that resolves them.

Depth first traversal with overrides for class and dex cache. The
work list keeps track of what oat_index with each pushed item. This
means the static fields of a class will usually be in the same image.

Added layout test to image_test to make sure things are somewhat
reasonably attributed.

Bug: 28640955

Test: test-art-host

(cherry picked from commit 4e9c4e746617bad6a012d799d2f5cf9e01d24ea2)

Change-Id: I67a536c33aeed603b252d8e0f75622c9efbf2559

1 files changed, 4 insertions, 0 deletions

diff --git a/runtime/class_table.h b/runtime/class_table.h
index 66c241fb22..8c91806ae2 100644
--- a/runtime/class_table.h
+++ b/runtime/class_table.h
@@ -163,6 +163,8 @@ class ClassTable {
   }
 
  private:
+  void InsertWithoutLocks(mirror::Class* klass) NO_THREAD_SAFETY_ANALYSIS;
+
   // Lock to guard inserting and removing.
   mutable ReaderWriterMutex lock_;
   // We have a vector to help prevent dirty pages after the zygote forks by calling FreezeSnapshot.
@@ -171,6 +173,8 @@ class ClassTable {
   // loader which may not be owned by the class loader must be held strongly live. Also dex caches
   // are held live to prevent them being unloading once they have classes in them.
   std::vector<GcRoot<mirror::Object>> strong_roots_ GUARDED_BY(lock_);
+
+  friend class ImageWriter;  // for InsertWithoutLocks.
 };
 
 }  // namespace art