[Zucchini]: Support DEX AnnotationsDirectoryItem

Adds support for AnnotationsDirectoryItem references. These take a
similar form to variable length reference lists; however, the header
for the list is not just the size of one list but rather three sublists
and also contains a reference to class annotations within the header.

The CL adds a parser for these items and a few types. The
ReferenceReader is reused from the CachedItemListReferenceReader. There
isn't a noticeable change in generation or apply time but the memory
footprint can potentially be much larger as each annotation can produce
on average a few offsets and there can be thousands of instances.

Bug: 847571
Change-Id: I04afe4c6e35c66c0c9157ed3ac3e5bf338931f03
Reviewed-on: https://chromium-review.googlesource.com/1095645
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566420}
NOKEYCHECK=True
GitOrigin-RevId: 966646525b939a8fd52a993894bbb3822d9cb674

1 files changed, 30 insertions, 0 deletions

diff --git a/type_dex.h b/type_dex.h
index 508d331..432a031 100644
--- a/type_dex.h
+++ b/type_dex.h
@@ -227,6 +227,36 @@ struct AnnotationOffItem {
   uint32_t annotation_off;
 };
 
+// field_annotation
+struct FieldAnnotation {
+  uint32_t field_idx;
+  uint32_t annotations_off;
+};
+
+// method_annotation
+struct MethodAnnotation {
+  uint32_t method_idx;
+  uint32_t annotations_off;
+};
+
+// parameter_annotation
+struct ParameterAnnotation {
+  uint32_t method_idx;
+  uint32_t annotations_off;
+};
+
+// annotations_directory_item
+struct AnnotationsDirectoryItem {
+  uint32_t class_annotations_off;
+  uint32_t fields_size;
+  uint32_t annotated_methods_size;
+  uint32_t annotated_parameters_size;
+  // FieldAnnotation field_annotations[fields_size];
+  // MethodAnnotation method_annotations[annotated_methods_size];
+  // ParameterAnnotation parameter_annotations[annotated_parameters_size];
+  // All *Annotation are 8 bytes each.
+};
+
 // try_item
 struct TryItem {
   uint32_t start_addr;