Add intrinsic for Reference.get()

Added an intrinsic function for Reference.get(). Return immediately
without going through JNI if the slow path is not currently in use.
Otherwise, branch off to the the existing JNI function.

Approximately 47x speedup for cases where slow path is not enabled.

Change-Id: I13ad65a356fe4e104d8d83980694dc2740d7d039

1 files changed, 8 insertions, 0 deletions

diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index 04f6946aa8..8fdead6dde 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -626,6 +626,13 @@ struct ReferenceOffsets : public CheckOffsets<mirror::Reference> {
   };
 };
 
+struct ReferenceClassOffsets : public CheckOffsets<mirror::ReferenceClass> {
+  ReferenceClassOffsets() : CheckOffsets<mirror::ReferenceClass>(true, "Ljava/lang/ref/Reference;") {
+    offsets.push_back(CheckOffset(OFFSETOF_MEMBER(mirror::ReferenceClass, disable_intrinsic_), "disableIntrinsic"));
+    offsets.push_back(CheckOffset(OFFSETOF_MEMBER(mirror::ReferenceClass, slow_path_enabled_), "slowPathEnabled"));
+  };
+};
+
 struct FinalizerReferenceOffsets : public CheckOffsets<mirror::FinalizerReference> {
   FinalizerReferenceOffsets() : CheckOffsets<mirror::FinalizerReference>(false, "Ljava/lang/ref/FinalizerReference;") {
     // alphabetical references
@@ -651,6 +658,7 @@ TEST_F(ClassLinkerTest, ValidateFieldOrderOfJavaCppUnionClasses) {
   EXPECT_TRUE(ProxyOffsets().Check());
   EXPECT_TRUE(DexCacheOffsets().Check());
   EXPECT_TRUE(ReferenceOffsets().Check());
+  EXPECT_TRUE(ReferenceClassOffsets().Check());
   EXPECT_TRUE(FinalizerReferenceOffsets().Check());
 
   EXPECT_TRUE(ClassClassOffsets().Check());