From: Hiroshi Yamauchi <yamauchi@google.com>
Date: Fri, 2 Oct 2015 20:41:34 +0000 (-0700)
Subject: Make it possible to change the read barrier type as build config.
X-Git-Tag: android-x86-7.1-r1~889^2~225^2
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=2e287754fcc0f3ecd10fcc9623800d935618360a;p=android-x86%2Fart.git

Make it possible to change the read barrier type as build config.

Bug: 12687968
Change-Id: Ib43dab4d4e68a5a962347fcc2163c3100cb5b760
---

diff --git a/build/Android.common_build.mk b/build/Android.common_build.mk
index 288bdddfe..b50712429 100644
--- a/build/Android.common_build.mk
+++ b/build/Android.common_build.mk
@@ -300,9 +300,17 @@ ifeq ($(ART_HEAP_POISONING),true)
   art_asflags += -DART_HEAP_POISONING=1
 endif
 
+#
+# Used to change the read barrier type. Valid values are BAKER, BROOKS, TABLELOOKUP.
+# The default is BAKER.
+#
+ART_READ_BARRIER_TYPE ?= BAKER
+
 ifeq ($(ART_USE_READ_BARRIER),true)
   art_cflags += -DART_USE_READ_BARRIER=1
+  art_cflags += -DART_READ_BARRIER_TYPE_IS_$(ART_READ_BARRIER_TYPE)=1
   art_asflags += -DART_USE_READ_BARRIER=1
+  art_asflags += -DART_READ_BARRIER_TYPE_IS_$(ART_READ_BARRIER_TYPE)=1
 endif
 
 ifeq ($(ART_USE_TLAB),true)
@@ -392,7 +400,6 @@ art_debug_cflags :=
 art_non_debug_cflags :=
 art_host_non_debug_cflags :=
 art_target_non_debug_cflags :=
-art_default_gc_type :=
 art_default_gc_type_cflags :=
 
 ART_HOST_LDLIBS :=
diff --git a/runtime/read_barrier_c.h b/runtime/read_barrier_c.h
index 710c21f03..8e5b1872f 100644
--- a/runtime/read_barrier_c.h
+++ b/runtime/read_barrier_c.h
@@ -26,10 +26,16 @@
 // table-lookup read barriers.
 
 #ifdef ART_USE_READ_BARRIER
+#if ART_READ_BARRIER_TYPE_IS_BAKER
 #define USE_BAKER_READ_BARRIER
-// #define USE_BROOKS_READ_BARRIER
-// #define USE_TABLE_LOOKUP_READ_BARRIER
+#elif ART_READ_BARRIER_TYPE_IS_BROOKS
+#define USE_BROOKS_READ_BARRIER
+#elif ART_READ_BARRIER_TYPE_IS_TABLELOOKUP
+#define USE_TABLE_LOOKUP_READ_BARRIER
+#else
+#error "ART read barrier type must be set"
 #endif
+#endif  // ART_USE_READ_BARRIER
 
 #ifdef ART_HEAP_POISONING
 #define USE_HEAP_POISONING