diff --git a/cleanspec.mk b/cleanspec.mk
index 43d3630..ba9b617 100644
--- a/cleanspec.mk
+++ b/cleanspec.mk
@@ -79,6 +79,8 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/bin/bugreport)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libwebcore_intermediates)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libwebcore_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libdvm_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libandroid_runtime_intermediates)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libwebcore_intermediates)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libwebcore_intermediates)
 $(call add-clean-step, rm -rf $(OUT_DIR)/obj/target/common/obj/APPS/VoiceSearch_intermediates)
diff --git a/core/binary.mk b/core/binary.mk
index 4413d47..d5528b1 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -9,6 +9,15 @@
 include $(BUILD_SYSTEM)/base_rules.mk
 #######################################
 
+####################################################
+## Add FDO flags if FDO is turned on and supported
+####################################################
+ifeq ($(strip $(LOCAL_NO_FDO_SUPPORT)),)
+  LOCAL_CFLAGS += $(TARGET_FDO_CFLAGS)
+  LOCAL_CPPFLAGS += $(TARGET_FDO_CFLAGS)
+  LOCAL_LDFLAGS += $(TARGET_FDO_CFLAGS)
+endif
+
 ###########################################################
 ## Define PRIVATE_ variables used by multiple module types
 ###########################################################
diff --git a/core/build_id.mk b/core/build_id.mk
index 4661aea..40bb35d 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -23,7 +23,7 @@
 # (like "TC1-RC5").  It must be a single word, and is
 # capitalized by convention.
 #
-BUILD_ID := ECLAIR
+BUILD_ID := MASTER
 
 # DISPLAY_BUILD_NUMBER should only be set for development branches,
 # If set, the BUILD_NUMBER (cl) is appended to the BUILD_ID for
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index a7eba3f..99d7eb0 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -33,6 +33,7 @@
 LOCAL_CXX:=
 LOCAL_CPP_EXTENSION:=
 LOCAL_NO_DEFAULT_COMPILER_FLAGS:=
+LOCAL_NO_FDO_SUPPORT :=
 LOCAL_ARM_MODE:=
 LOCAL_YACCFLAGS:=
 LOCAL_ASFLAGS:=
diff --git a/core/combo/darwin-x86.mk b/core/combo/darwin-x86.mk
index 2150960..47f5ccd 100644
--- a/core/combo/darwin-x86.mk
+++ b/core/combo/darwin-x86.mk
@@ -29,6 +29,7 @@
         -o $@ \
         $(PRIVATE_LDFLAGS) \
         $(if $(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES),-all_load) \
+        $(TARGET_FDO_LIB) \
         $(TARGET_LIBGCC)
 endef
 
@@ -42,6 +43,7 @@
         $(PRIVATE_LDLIBS) \
         $(call normalize-target-libraries,$(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES)) \
         $(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
+        $(TARGET_FDO_LIB) \
         $(TARGET_LIBGCC)
 endef
 
@@ -55,6 +57,7 @@
         $(PRIVATE_LDLIBS) \
         $(call normalize-target-libraries,$(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES)) \
         $(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
+        $(TARGET_FDO_LIB) \
         $(TARGET_LIBGCC)
 endef
 
@@ -94,4 +97,3 @@
 endef
 
 endif
-
diff --git a/core/combo/linux-arm.mk b/core/combo/linux-arm.mk
index 6011351..44d3540 100644
--- a/core/combo/linux-arm.mk
+++ b/core/combo/linux-arm.mk
@@ -135,6 +135,37 @@
 $(combo_target)LIBGCC := $(shell $($(combo_target)CC) $($(combo_target)GLOBAL_CFLAGS) -print-libgcc-file-name)
 endif
 
+# Define FDO (Feedback Directed Optimization) options.
+
+TARGET_FDO_CFLAGS:=
+TARGET_FDO_LIB:=
+
+target_libgcov := $(shell $($(combo_target)CC) $($(combo_target)GLOBAL_CFLAGS) \
+        --print-file-name=libgcov.a)
+ifneq ($(strip $(BUILD_FDO_INSTRUMENT)),)
+  # Set BUILD_FDO_INSTRUMENT=true to turn on FDO instrumentation.
+  # The profile will be generated on /data/local/tmp/profile on the device.
+  TARGET_FDO_CFLAGS := -fprofile-generate=/data/local/tmp/profile -DANDROID_FDO
+  TARGET_FDO_LIB := $(target_libgcov)
+else
+  # If BUILD_FDO_INSTRUMENT is turned off, then consider doing the FDO optimizations.
+  # Set TARGET_FDO_PROFILE_PATH to set a custom profile directory for your build.
+  ifeq ($(strip $(TARGET_FDO_PROFILE_PATH)),)
+    TARGET_FDO_PROFILE_PATH := fdo/profiles/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT)
+  else
+    ifeq ($(strip $(wildcard $(TARGET_FDO_PROFILE_PATH))),)
+      $(warning Custom TARGET_FDO_PROFILE_PATH supplied, but directory does not exist. Turn off FDO.)
+    endif
+  endif
+
+  # If the FDO profile directory can't be found, then FDO is off.
+  ifneq ($(strip $(wildcard $(TARGET_FDO_PROFILE_PATH))),)
+    TARGET_FDO_CFLAGS := -fprofile-use=$(TARGET_FDO_PROFILE_PATH) -DANDROID_FDO
+    TARGET_FDO_LIB := $(target_libgcov)
+  endif
+endif
+
+
 # unless CUSTOM_KERNEL_HEADERS is defined, we're going to use
 # symlinks located in out/ to point to the appropriate kernel
 # headers. see 'config/kernel_headers.make' for more details
@@ -166,6 +197,10 @@
 $(combo_target)DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libm
 
 $(combo_target)CUSTOM_LD_COMMAND := true
+
+# Enable the Dalvik JIT compiler
+WITH_JIT := true
+
 define transform-o-to-shared-lib-inner
 $(TARGET_CXX) \
 	-nostdlib -Wl,-soname,$(notdir $@) -Wl,-T,$(BUILD_SYSTEM)/armelf.xsc \
@@ -181,6 +216,7 @@
 	-o $@ \
 	$(PRIVATE_LDFLAGS) \
 	$(TARGET_GLOBAL_LDFLAGS) \
+	$(TARGET_FDO_LIB) \
 	$(TARGET_LIBGCC)
 endef
 
@@ -198,6 +234,7 @@
 	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
 	$(PRIVATE_LDFLAGS) \
 	$(TARGET_GLOBAL_LDFLAGS) \
+	$(TARGET_FDO_LIB) \
 	$(TARGET_LIBGCC) \
 	$(TARGET_CRTEND_O)
 endef
@@ -212,6 +249,7 @@
 	$(TARGET_GLOBAL_LDFLAGS) \
 	$(PRIVATE_ALL_OBJECTS) \
 	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
+	$(TARGET_FDO_LIB) \
 	$(TARGET_LIBGCC) \
 	$(TARGET_CRTEND_O)
 endef
diff --git a/core/dynamic_binary.mk b/core/dynamic_binary.mk
index f07cf2a..0818d87 100644
--- a/core/dynamic_binary.mk
+++ b/core/dynamic_binary.mk
@@ -91,6 +91,13 @@
 # around, so we have to use this version.
 prelink_output := $(LOCAL_UNSTRIPPED_PATH)/$(LOCAL_MODULE_SUBDIR)$(LOCAL_BUILT_MODULE_STEM)
 
+# Skip prelinker if it is FDO instrumentation build.
+ifneq ($(strip $(BUILD_FDO_INSTRUMENT)),)
+ifneq ($(LOCAL_NO_FDO_SUPPORT),true)
+LOCAL_PRELINK_MODULE := false
+endif
+endif
+
 ifeq ($(LOCAL_PRELINK_MODULE),true)
 $(prelink_output): $(prelink_input) $(TARGET_PRELINKER_MAP) $(APRIORI)
 	$(transform-to-prelinked)
diff --git a/tools/adbs b/tools/adbs
index 8b1fac6..815ae10 100755
--- a/tools/adbs
+++ b/tools/adbs
@@ -217,6 +217,7 @@
       SymbolTranslation(groups)
     else:
       print line
+      sys.stdout.flush()
 
   # adb itself aborts
   stream.close()
diff --git a/tools/apicheck/src/com/android/apicheck/ClassInfo.java b/tools/apicheck/src/com/android/apicheck/ClassInfo.java
index 5405ad2..d4416f4 100644
--- a/tools/apicheck/src/com/android/apicheck/ClassInfo.java
+++ b/tools/apicheck/src/com/android/apicheck/ClassInfo.java
@@ -121,7 +121,11 @@
             consistent = false;
         }
         for (String iface : mInterfaces) {
-            if (!cl.mInterfaces.contains(iface)) {
+            boolean found = false;
+            for (ClassInfo c = cl; c != null && !found; c = c.mSuperClass) {
+                found = c.mInterfaces.contains(iface);
+            }
+            if (!found) {
                 Errors.error(Errors.REMOVED_INTERFACE, cl.position(),
                         "Class " + qualifiedName() + " no longer implements " + iface);
             }
diff --git a/tools/droiddoc/src/MethodInfo.java b/tools/droiddoc/src/MethodInfo.java
index 3211038..7f96b80 100644
--- a/tools/droiddoc/src/MethodInfo.java
+++ b/tools/droiddoc/src/MethodInfo.java
@@ -363,8 +363,17 @@
     public String getHashableName() {
         StringBuilder result = new StringBuilder();
         result.append(name());
-        for (ParameterInfo pInfo : mParameters) {
-            result.append(":").append(pInfo.type().fullName());
+        for (int p = 0; p < mParameters.length; p++) {
+            result.append(":");
+            if (p == mParameters.length - 1 && isVarArgs()) {
+                // TODO: note that this does not attempt to handle hypothetical
+                // vararg methods whose last parameter is a list of arrays, e.g.
+                // "Object[]...".
+                result.append(mParameters[p].type().fullNameNoDimension(typeVariables()))
+                        .append("...");
+            } else {
+                result.append(mParameters[p].type().fullName(typeVariables()));
+            }
         }
         return result.toString();
     }
diff --git a/tools/droiddoc/src/SinceTagger.java b/tools/droiddoc/src/SinceTagger.java
index fb69c04..a1bce55 100644
--- a/tools/droiddoc/src/SinceTagger.java
+++ b/tools/droiddoc/src/SinceTagger.java
@@ -1,8 +1,13 @@
 // Copyright 2009 Google Inc. All Rights Reserved.
 
-import com.android.apicheck.*;
+import com.android.apicheck.ApiCheck;
+import com.android.apicheck.ApiInfo;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Collections;
 
 import org.clearsilver.HDF;
 
@@ -165,31 +170,68 @@
      */
     private void warnForMissingVersions(ClassInfo[] classDocs) {
         for (ClassInfo claz : classDocs) {
+            if (!checkLevelRecursive(claz)) {
+                continue;
+            }
+
             if (claz.getSince() == null) {
                 Errors.error(Errors.NO_SINCE_DATA, claz.position(),
                         "XML missing class " + claz.qualifiedName());
             }
-            for (FieldInfo field : claz.fields()) {
-                if (field.getSince() == null) {
-                    Errors.error(Errors.NO_SINCE_DATA, field.position(),
-                            "XML missing field "
-                                    + claz.qualifiedName() + "#" + field .name());
-                }
+            
+            for (FieldInfo field : missingVersions(claz.fields())) {
+                Errors.error(Errors.NO_SINCE_DATA, field.position(),
+                        "XML missing field " + claz.qualifiedName()
+                                + "#" + field.name());
             }
-            for (MethodInfo constructor : claz.constructors()) {
-                if (constructor.getSince() == null) {
-                    Errors.error(Errors.NO_SINCE_DATA, constructor.position(),
-                            "XML missing constructor "
-                                    + claz.qualifiedName() + "#" + constructor.getHashableName());
-                }
+
+            for (MethodInfo constructor : missingVersions(claz.constructors())) {
+                Errors.error(Errors.NO_SINCE_DATA, constructor.position(),
+                        "XML missing constructor " + claz.qualifiedName()
+                                + "#" + constructor.getHashableName());
             }
-            for (MethodInfo method : claz.methods()) {
-                if (method.getSince() == null) {
-                    Errors.error(Errors.NO_SINCE_DATA, method.position(),
-                            "XML missing method "
-                                    + claz.qualifiedName() + "#" + method .getHashableName());
-                }
+
+            for (MethodInfo method : missingVersions(claz.methods())) {
+                Errors.error(Errors.NO_SINCE_DATA, method.position(),
+                        "XML missing method " + claz.qualifiedName()
+                                + "#" + method.getHashableName());
             }
         }
     }
+
+    /**
+     * Returns the DocInfos in {@code all} that are documented but do not have
+     * since tags.
+     */
+    private <T extends MemberInfo> Iterable<T> missingVersions(T[] all) {
+        List<T> result = Collections.emptyList();
+        for (T t : all) {
+            // if this member has version info or isn't documented, skip it
+            if (t.getSince() != null
+                    || t.isHidden()
+                    || !checkLevelRecursive(t.realContainingClass())) {
+                continue;
+            }
+
+            if (result.isEmpty()) {
+                result = new ArrayList<T>(); // lazily construct a mutable list
+            }
+            result.add(t);
+        }
+        return result;
+    }
+
+    /**
+     * Returns true if {@code claz} and all containing classes are documented.
+     * The result may be used to filter out members that exist in the API
+     * data structure but aren't a part of the API.
+     */
+    private boolean checkLevelRecursive(ClassInfo claz) {
+        for (ClassInfo c = claz; c != null; c = c.containingClass()) {
+            if (!c.checkLevel()) {
+                return false;
+            }
+        }
+        return true;
+    }
 }