commit 9d4b6da934934c322536ee3309b63ce402740f49
author Igor Murashkin <iam@google.com> Fri Jul 29 09:51:58 2016 -0700
committer Igor Murashkin <iam@google.com> Tue Aug 16 20:19:36 2016 +0000
tree 9e7ee5023d6036b98e0560411bb0527efdedca01
parent 2af1aa066e3d20edd8fea5d5b6dbbbad73102d52

jni: Fast path for @FastNative annotated java methods

Adds a faster path for java methods annotated with
dalvik.annotation.optimization.FastNative .

Intended to replace usage of fast JNI (registering with "!(FOO)BAR" descriptors).

Performance Microbenchmark Results (Angler):
* Regular JNI cost in nanoseconds: 115
* Fast JNI cost in nanoseconds: 60
* @FastNative cost in nanoseconds: 36

Summary: Up to 67% faster (vs fast jni) JNI transition cost

Change-Id: Ic23823ae0f232270c068ec999fd89aa993894b0e

compiler/compiler.h

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 487a27f..a955f3c 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -38,6 +38,11 @@
     kOptimizing
   };
 
+  enum JniOptimizationFlags {
+    kNone,
+    kFastNative,
+  };
+
   static Compiler* Create(CompilerDriver* driver, Kind kind);
 
   virtual void Init() = 0;
@@ -57,7 +62,8 @@
 
   virtual CompiledMethod* JniCompile(uint32_t access_flags,
                                      uint32_t method_idx,
-                                     const DexFile& dex_file) const = 0;
+                                     const DexFile& dex_file,
+                                     JniOptimizationFlags optimization_flags) const = 0;
 
   virtual bool JitCompile(Thread* self ATTRIBUTE_UNUSED,
                           jit::JitCodeCache* code_cache ATTRIBUTE_UNUSED,