8023373: allow super invocation for adapters

Reviewed-by: lagergren, sundar

nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java

@@ -173,6 +173,9 @@ final class JavaAdapterBytecodeGenerator {
     private static final String CLASS_INIT = "<clinit>";
     private static final String STATIC_GLOBAL_FIELD_NAME = "staticGlobal";
 
+    // Method name prefix for invoking super-methods
+    private static final String SUPER_PREFIX = "super$";
+
     /**
      * Collection of methods we never override: Object.clone(), Object.finalize().
      */
@@ -240,6 +243,7 @@ final class JavaAdapterBytecodeGenerator {
         }
         generateConstructors();
         generateMethods();
+        generateSuperMethods();
         // }
         cw.visitEnd();
     }
@@ -507,6 +511,10 @@ final class JavaAdapterBytecodeGenerator {
 
     private static void endInitMethod(final InstructionAdapter mv) {
         mv.visitInsn(RETURN);
+        endMethod(mv);
+    }
+
+    private static void endMethod(final InstructionAdapter mv) {
         mv.visitMaxs(0, 0);
         mv.visitEnd();
     }
@@ -603,13 +611,8 @@ final class JavaAdapterBytecodeGenerator {
      */
     private void generateMethod(final MethodInfo mi) {
         final Method method = mi.method;
-        final int mod = method.getModifiers();
-        final int access = ACC_PUBLIC | (method.isVarArgs() ? ACC_VARARGS : 0);
         final Class<?>[] exceptions = method.getExceptionTypes();
-        final String[] exceptionNames = new String[exceptions.length];
-        for (int i = 0; i < exceptions.length; ++i) {
-            exceptionNames[i] = Type.getInternalName(exceptions[i]);
-        }
+        final String[] exceptionNames = getExceptionNames(exceptions);
         final MethodType type = mi.type;
         final String methodDesc = type.toMethodDescriptorString();
         final String name = mi.getName();
@@ -617,14 +620,8 @@ final class JavaAdapterBytecodeGenerator {
         final Type asmType = Type.getMethodType(methodDesc);
         final Type[] asmArgTypes = asmType.getArgumentTypes();
 
-        // Determine the first index for a local variable
-        int nextLocalVar = 1; // this
-        for(final Type t: asmArgTypes) {
-            nextLocalVar += t.getSize();
-        }
-
-        final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(access, name, methodDesc, null,
-                exceptionNames));
+        final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(getAccessModifiers(method), name,
+                methodDesc, null, exceptionNames));
         mv.visitCode();
 
         final Label instanceHandleDefined = new Label();
@@ -646,7 +643,7 @@ final class JavaAdapterBytecodeGenerator {
         }
 
         // No handle is available, fall back to default behavior
-        if(Modifier.isAbstract(mod)) {
+        if(Modifier.isAbstract(method.getModifiers())) {
             // If the super method is abstract, throw an exception
             mv.anew(UNSUPPORTED_OPERATION_TYPE);
             mv.dup();
@@ -654,14 +651,7 @@ final class JavaAdapterBytecodeGenerator {
             mv.athrow();
         } else {
             // If the super method is not abstract, delegate to it.
-            mv.visitVarInsn(ALOAD, 0);
-            int nextParam = 1;
-            for(final Type t: asmArgTypes) {
-                mv.load(nextParam, t);
-                nextParam += t.getSize();
-            }
-            mv.invokespecial(superClassName, name, methodDesc);
-            mv.areturn(asmReturnType);
+            emitSuperCall(mv, name, methodDesc);
         }
 
         final Label setupGlobal = new Label();
@@ -685,6 +675,12 @@ final class JavaAdapterBytecodeGenerator {
         // stack: [creatingGlobal, someHandle]
         mv.visitLabel(setupGlobal);
 
+        // Determine the first index for a local variable
+        int nextLocalVar = 1; // "this" is at 0
+        for(final Type t: asmArgTypes) {
+            nextLocalVar += t.getSize();
+        }
+        // Set our local variable indices
         final int currentGlobalVar  = nextLocalVar++;
         final int globalsDifferVar  = nextLocalVar++;
 
@@ -775,8 +771,7 @@ final class JavaAdapterBytecodeGenerator {
             }
             mv.visitTryCatchBlock(tryBlockStart, tryBlockEnd, throwableHandler, THROWABLE_TYPE_NAME);
         }
-        mv.visitMaxs(0, 0);
-        mv.visitEnd();
+        endMethod(mv);
     }
 
     /**
@@ -817,6 +812,53 @@ final class JavaAdapterBytecodeGenerator {
         return false;
     }
 
+    private void generateSuperMethods() {
+        for(final MethodInfo mi: methodInfos) {
+            if(!Modifier.isAbstract(mi.method.getModifiers())) {
+                generateSuperMethod(mi);
+            }
+        }
+    }
+
+    private void generateSuperMethod(MethodInfo mi) {
+        final Method method = mi.method;
+
+        final String methodDesc = mi.type.toMethodDescriptorString();
+        final String name = mi.getName();
+
+        final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(getAccessModifiers(method),
+                SUPER_PREFIX + name, methodDesc, null, getExceptionNames(method.getExceptionTypes())));
+        mv.visitCode();
+
+        emitSuperCall(mv, name, methodDesc);
+
+        endMethod(mv);
+    }
+
+    private void emitSuperCall(final InstructionAdapter mv, final String name, final String methodDesc) {
+        mv.visitVarInsn(ALOAD, 0);
+        int nextParam = 1;
+        final Type methodType = Type.getMethodType(methodDesc);
+        for(final Type t: methodType.getArgumentTypes()) {
+            mv.load(nextParam, t);
+            nextParam += t.getSize();
+        }
+        mv.invokespecial(superClassName, name, methodDesc);
+        mv.areturn(methodType.getReturnType());
+    }
+
+    private static String[] getExceptionNames(final Class<?>[] exceptions) {
+        final String[] exceptionNames = new String[exceptions.length];
+        for (int i = 0; i < exceptions.length; ++i) {
+            exceptionNames[i] = Type.getInternalName(exceptions[i]);
+        }
+        return exceptionNames;
+    }
+
+    private static int getAccessModifiers(final Method method) {
+        return ACC_PUBLIC | (method.isVarArgs() ? ACC_VARARGS : 0);
+    }
+
     /**
      * Gathers methods that can be implemented or overridden from the specified type into this factory's
      * {@link #methodInfos} set. It will add all non-final, non-static methods that are either public or protected from

nashorn/test/script/basic/JDK-8023373.js

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2010, 2013, 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.
+ * 
+ * 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.
+ */
+
+/**
+ * JDK-8023373: allow super invocation for adapters
+ *
+ * @test
+ * @run
+ */
+
+var CharArray = Java.type("char[]")
+var jString = Java.type("java.lang.String")
+var Character = Java.type("java.lang.Character")
+
+function capitalize(s) {
+    if(s instanceof CharArray) {
+        return new jString(s).toUpperCase()
+    }
+    if(s instanceof jString) {
+        return s.toUpperCase()
+    }
+    return Character.toUpperCase(s) // must be int
+}
+
+var sw = new (Java.type("java.io.StringWriter"))
+
+var FilterWriterAdapter = Java.extend(Java.type("java.io.FilterWriter"))
+
+var cw = new FilterWriterAdapter(sw) {
+    write: function(s, off, len) {
+        s = capitalize(s)
+        // Must handle overloads by arity
+        if(off === undefined) {	
+            cw.super$write(s, 0, s.length())
+        } else if (typeof s === "string") {
+            cw.super$write(s, off, len)
+        }
+    }
+}
+
+cw.write("abcd")
+cw.write("e".charAt(0))
+cw.write("fgh".toCharArray())
+cw.write("**ijk**", 2, 3)
+cw.write("***lmno**".toCharArray(), 3, 4)
+cw.flush()
+print(sw)
+
+// Can invoke super for Object methods
+print("cw has super hashCode(): " + (typeof cw.super$hashCode === "function"))
+print("cw has super equals(): " + (typeof cw.super$equals === "function"))
+// Can't invoke super for final methods
+print("cw has no super getClass(): " + (typeof cw.super$getClass === "undefined"))
+print("cw has no super wait(): " + (typeof cw.super$wait === "undefined"))
+
+var r = new (Java.type("java.lang.Runnable"))(function() {})
+// Can't invoke super for abstract methods
+print("r has no super run(): " + (typeof r.super$run === "undefined"))
+// Interfaces can also invoke super Object methods
+print("r has super hashCode(): " + (typeof r.super$hashCode === "function"))
+print("r has super equals(): " + (typeof r.super$equals === "function"))
+// But still can't invoke final methods
+print("r has no super getClass(): " + (typeof r.super$getClass === "undefined"))
+print("r has no super wait(): " + (typeof r.super$wait === "undefined"))

nashorn/test/script/basic/JDK-8023373.js.EXPECTED

@@ -0,0 +1,10 @@
+ABCDEFGHIJKLMNO
+cw has super hashCode(): true
+cw has super equals(): true
+cw has no super getClass(): true
+cw has no super wait(): true
+r has no super run(): true
+r has super hashCode(): true
+r has super equals(): true
+r has no super getClass(): true
+r has no super wait(): true