JNI: Rewrite read barrier slow path.

Preserve all argument registers in the slow path to prepare
for moving arguments in registers for @FastNative. Move the
read barrier check earlier as it logically belongs to the
transition frame creation. For Baker read barriers, add a
mark bit check with fast return to the main path.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: run-gtests.sh
Test: testrunner.py --target --optimizing
Bug: 172332525
Change-Id: I50bbc0bc9d54577281e7667aafebb4a53a539af1

1 files changed, 4 insertions, 0 deletions

diff --git a/compiler/utils/jni_macro_assembler.h b/compiler/utils/jni_macro_assembler.h
index 0ccf4cd60e..7f5dc2f76b 100644
--- a/compiler/utils/jni_macro_assembler.h
+++ b/compiler/utils/jni_macro_assembler.h
@@ -257,6 +257,10 @@ class JNIMacroAssembler : public DeletableArenaObject<kArenaAllocAssembler> {
   virtual void Jump(JNIMacroLabel* label) = 0;
   // Emit a conditional jump to the label by applying a unary condition test to the GC marking flag.
   virtual void TestGcMarking(JNIMacroLabel* label, JNIMacroUnaryCondition cond) = 0;
+  // Emit a conditional jump to the label by applying a unary condition test to object's mark bit.
+  virtual void TestMarkBit(ManagedRegister ref,
+                           JNIMacroLabel* label,
+                           JNIMacroUnaryCondition cond) = 0;
   // Code at this offset will serve as the target for the Jump call.
   virtual void Bind(JNIMacroLabel* label) = 0;