8058828: Wrong ciConstant type for arrays from ConstantPool::_resolved_reference

Reviewed-by: kvn, jrose

src/share/vm/ci/ciEnv.cpp

@@ -559,8 +559,13 @@ ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
     oop obj = cpool->resolved_references()->obj_at(cache_index);
     if (obj != NULL) {
       ciObject* ciobj = get_object(obj);
+      if (ciobj->is_array()) {
+        return ciConstant(T_ARRAY, ciobj);
+      } else {
+        assert(ciobj->is_instance(), "should be an instance");
         return ciConstant(T_OBJECT, ciobj);
       }
+    }
     index = cpool->object_to_cp_index(cache_index);
   }
   constantTag tag = cpool->tag_at(index);
@@ -586,8 +591,12 @@ ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
       }
     }
     ciObject* constant = get_object(string);
+    if (constant->is_array()) {
+      return ciConstant(T_ARRAY, constant);
+    } else {
       assert (constant->is_instance(), "must be an instance, or not? ");
       return ciConstant(T_OBJECT, constant);
+    }
   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
     // 4881222: allow ldc to take a class type
     ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);

src/share/vm/ci/ciTypeFlow.cpp

@@ -730,7 +730,7 @@ void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) {
     if (obj->is_null_object()) {
       push_null();
     } else {
-      assert(obj->is_instance(), "must be java_mirror of klass");
+      assert(obj->is_instance() || obj->is_array(), "must be java_mirror of klass");
       push_object(obj->klass());
     }
   } else {

test/compiler/jsr292/VMAnonymousClasses.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/**
+ * @test
+ * @bug 8058828
+ * @run main/bootclasspath -Xbatch VMAnonymousClasses
+ */
+
+import jdk.internal.org.objectweb.asm.ClassWriter;
+import jdk.internal.org.objectweb.asm.MethodVisitor;
+import jdk.internal.org.objectweb.asm.Opcodes;
+import sun.misc.Unsafe;
+
+import java.lang.invoke.ConstantCallSite;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.invoke.MutableCallSite;
+import java.lang.invoke.VolatileCallSite;
+
+public class VMAnonymousClasses {
+    static final String TEST_METHOD_NAME = "constant";
+
+    static final Unsafe UNSAFE = Unsafe.getUnsafe();
+
+    static int getConstantPoolSize(byte[] classFile) {
+        // The first few bytes:
+        // u4 magic;
+        // u2 minor_version;
+        // u2 major_version;
+        // u2 constant_pool_count;
+        return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
+    }
+
+    static void test(Object value) throws ReflectiveOperationException {
+        System.out.printf("Test: %s", value != null ? value.getClass() : "null");
+
+        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
+        cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, "Test", null, "java/lang/Object", null);
+
+        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, TEST_METHOD_NAME, "()Ljava/lang/Object;", null, null);
+
+        String placeholder = "CONSTANT";
+        int index = cw.newConst(placeholder);
+        mv.visitLdcInsn(placeholder);
+        mv.visitInsn(Opcodes.ARETURN);
+
+        mv.visitMaxs(0, 0);
+        mv.visitEnd();
+
+        byte[] classFile = cw.toByteArray();
+
+        Object[] cpPatches = new Object[getConstantPoolSize(classFile)];
+        cpPatches[index] = value;
+
+        Class<?> test = UNSAFE.defineAnonymousClass(VMAnonymousClasses.class, classFile, cpPatches);
+
+        Object expectedResult = (value != null) ? value : placeholder;
+        for (int i = 0; i<15000; i++) {
+            Object result = test.getMethod(TEST_METHOD_NAME).invoke(null);
+            if (result != expectedResult) {
+                throw new AssertionError(String.format("Wrong value returned: %s != %s", value, result));
+            }
+        }
+        System.out.println(" PASSED");
+    }
+
+    public static void main(String[] args) throws ReflectiveOperationException  {
+        // Objects
+        test(new Object());
+        test("TEST");
+        test(new VMAnonymousClasses());
+        test(null);
+
+        // Class
+        test(String.class);
+
+        // Arrays
+        test(new boolean[0]);
+        test(new byte[0]);
+        test(new char[0]);
+        test(new short[0]);
+        test(new int[0]);
+        test(new long[0]);
+        test(new float[0]);
+        test(new double[0]);
+        test(new Object[0]);
+
+        // Multi-dimensional arrays
+        test(new byte[0][0]);
+        test(new Object[0][0]);
+
+        // MethodHandle-related
+        MethodType   mt = MethodType.methodType(void.class, String[].class);
+        MethodHandle mh = MethodHandles.lookup().findStatic(VMAnonymousClasses.class, "main", mt);
+        test(mt);
+        test(mh);
+        test(new ConstantCallSite(mh));
+        test(new MutableCallSite(MethodType.methodType(void.class)));
+        test(new VolatileCallSite(MethodType.methodType(void.class)));
+
+        System.out.println("TEST PASSED");
+    }
+}