7082631: JSR 292: need profiling support in GWTs

Add CountingMethodHandle

Reviewed-by: twisti, jrose

jdk/src/share/classes/java/lang/invoke/AdapterMethodHandle.java

@@ -53,7 +53,7 @@ class AdapterMethodHandle extends BoundMethodHandle {
         // JVM might update VM-specific bits of conversion (ignore)
         MethodHandleNatives.init(this, target, convArgPos(conv));
     }
-    private AdapterMethodHandle(MethodHandle target, MethodType newType,
+    AdapterMethodHandle(MethodHandle target, MethodType newType,
                 long conv) {
         this(target, newType, conv, null);
     }
@@ -423,7 +423,7 @@ class AdapterMethodHandle extends BoundMethodHandle {
                 insertStackMove(stackMove)
                 );
     }
-    private static long makeConv(int convOp) {
+    static long makeConv(int convOp) {
         assert(convOp == OP_RETYPE_ONLY || convOp == OP_RETYPE_RAW);
         return ((long)-1 << 32) | (convOp << CONV_OP_SHIFT);   // stackMove, src, dst all zero
     }

jdk/src/share/classes/java/lang/invoke/CountingMethodHandle.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.lang.invoke;
+
+import static java.lang.invoke.MethodHandleNatives.Constants.*;
+
+/**
+ * This method handle is used to optionally provide a count of how
+ * many times it was invoked.
+ *
+ * @author never
+ */
+class CountingMethodHandle extends AdapterMethodHandle {
+    private int vmcount;
+
+    private CountingMethodHandle(MethodHandle target) {
+        super(target, target.type(), AdapterMethodHandle.makeConv(OP_RETYPE_ONLY));
+    }
+
+    /** Wrap the incoming MethodHandle in a CountingMethodHandle if they are enabled */
+    static MethodHandle wrap(MethodHandle mh) {
+        if (MethodHandleNatives.COUNT_GWT) {
+            return new CountingMethodHandle(mh);
+        }
+        return mh;
+    }
+}

jdk/src/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -749,8 +749,8 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         assert(target.type().equals(fallback.type()));
         MethodHandle tailcall = MethodHandles.exactInvoker(target.type());
         MethodHandle select = selectAlternative();
-        select = bindArgument(select, 2, fallback);
+        select = bindArgument(select, 2, CountingMethodHandle.wrap(fallback));
-        select = bindArgument(select, 1, target);
+        select = bindArgument(select, 1, CountingMethodHandle.wrap(target));
         // select(z: boolean) => (z ? target : fallback)
         MethodHandle filter = filterArgument(tailcall, 0, select);
         assert(filter.type().parameterType(0) == boolean.class);

jdk/src/share/classes/java/lang/invoke/MethodHandleNatives.java

@@ -120,6 +120,8 @@ class MethodHandleNatives {
 
     static final int OP_ROT_ARGS_DOWN_LIMIT_BIAS;
 
+    static final boolean COUNT_GWT;
+
     private static native void registerNatives();
     static {
         registerNatives();
@@ -131,6 +133,7 @@ class MethodHandleNatives {
         k                           = getConstant(Constants.GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS);
         OP_ROT_ARGS_DOWN_LIMIT_BIAS = (k != 0) ? (byte)k : -1;
         HAVE_RICOCHET_FRAMES        = (CONV_OP_IMPLEMENTED_MASK & (1<<OP_COLLECT_ARGS)) != 0;
+        COUNT_GWT                   = getConstant(Constants.GC_COUNT_GWT) != 0;
         //sun.reflect.Reflection.registerMethodsToFilter(MethodHandleImpl.class, "init");
     }
 
@@ -143,7 +146,8 @@ class MethodHandleNatives {
                 GC_JVM_PUSH_LIMIT = 0,
                 GC_JVM_STACK_MOVE_UNIT = 1,
                 GC_CONV_OP_IMPLEMENTED_MASK = 2,
-                GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS = 3;
+                GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS = 3,
+                GC_COUNT_GWT = 4;
         static final int
                 ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
                 ETF_DIRECT_HANDLE         = 1, // ultimate method handle (will be a DMH, may be self)