ART: Add support for patching and loading OAT files compiled with PIC

* Images (.art) compiled with pic now have a new field added.
* isDexOptNeeded will now skip patch-ing for apps compiled PIC
* First-boot patching now only copies boot.art, boot.oat is linked

As a result, all system preopted dex files (with --compile-pic) no
longer take up any space in /data/dalvik-cache/<isa>.

Bug: 18035729
Change-Id: Ie1acad81a0fd8b2f24e1f3f07a06e6fdb548be62

1 files changed, 10 insertions, 2 deletions

diff --git a/runtime/image.h b/runtime/image.h
index 03de509..7e2b847 100644
--- a/runtime/image.h
+++ b/runtime/image.h
@@ -28,7 +28,7 @@ namespace art {
 // header of image files written by ImageWriter, read and validated by Space.
 class PACKED(4) ImageHeader {
  public:
-  ImageHeader() {}
+  ImageHeader() : compile_pic_(0) {}
 
   ImageHeader(uint32_t image_begin,
               uint32_t image_size_,
@@ -39,7 +39,8 @@ class PACKED(4) ImageHeader {
               uint32_t oat_file_begin,
               uint32_t oat_data_begin,
               uint32_t oat_data_end,
-              uint32_t oat_file_end);
+              uint32_t oat_file_end,
+              bool compile_pic_);
 
   bool IsValid() const;
   const char* GetMagic() const;
@@ -121,6 +122,10 @@ class PACKED(4) ImageHeader {
 
   void RelocateImage(off_t delta);
 
+  bool CompilePic() const {
+    return compile_pic_ != 0;
+  }
+
  private:
   static const uint8_t kImageMagic[4];
   static const uint8_t kImageVersion[4];
@@ -162,6 +167,9 @@ class PACKED(4) ImageHeader {
   // Absolute address of an Object[] of objects needed to reinitialize from an image.
   uint32_t image_roots_;
 
+  // Boolean (0 or 1) to denote if the image was compiled with --compile-pic option
+  const uint32_t compile_pic_;
+
   friend class ImageWriter;
 };