8150514: C1 crashes in Canonicalizer::do_ArrayLength() after fix for JDK-8150102

Reviewed-by: thartmann, vlivanov

hotspot/src/share/vm/c1/c1_Canonicalizer.cpp

@@ -239,7 +239,10 @@ void Canonicalizer::do_ArrayLength    (ArrayLength*     x) {
 
   } else if ((ct = x->array()->as_Constant()) != NULL) {
     // Constant arrays have constant lengths.
-    set_constant(ct->type()->as_ArrayConstant()->value()->length());
+    ArrayConstant* cnst = ct->type()->as_ArrayConstant();
+    if (cnst != NULL) {
+      set_constant(cnst->value()->length());
+    }
 
 #ifdef ASSERT
   } else {

hotspot/test/compiler/c1/CanonicalizeArrayLength.java

@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2016, 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 8150102 8150514
+ * @summary C1 crashes in Canonicalizer::do_ArrayLength() after fix for JDK-8150102
+ * @run main/othervm -XX:CompileThreshold=100 -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -XX:-BackgroundCompilation CanonicalizeArrayLength
+ *
+ */
+
+public class CanonicalizeArrayLength {
+    int[] arr = new int[42];
+    int[] arrNull = null;
+
+    final int[] finalArr = new int[42];
+    final int[] finalArrNull = null;
+
+    static int[] staticArr = new int[42];
+    static int[] staticArrNull = null;
+
+    static final int[] staticFinalArr = new int[42];
+    static final int[] staticFinalArrNull = null;
+
+    public static void main(String... args) {
+        CanonicalizeArrayLength t = new CanonicalizeArrayLength();
+        for (int i = 0; i < 20000; i++) {
+            if (t.testLocal() != 42)
+                throw new IllegalStateException();
+            if (t.testLocalNull() != 42)
+                throw new IllegalStateException();
+            if (t.testField() != 42)
+                throw new IllegalStateException();
+            if (t.testFieldNull() != 42)
+                throw new IllegalStateException();
+            if (t.testFinalField() != 42)
+                throw new IllegalStateException();
+            if (t.testFinalFieldNull() != 42)
+                throw new IllegalStateException();
+            if (t.testStaticField() != 42)
+                throw new IllegalStateException();
+            if (t.testStaticFieldNull() != 42)
+                throw new IllegalStateException();
+            if (t.testStaticFinalField() != 42)
+                throw new IllegalStateException();
+            if (t.testStaticFinalFieldNull() != 42)
+                throw new IllegalStateException();
+        }
+    }
+
+    int testField() {
+        try {
+            return arr.length;
+        } catch (Throwable t) {
+            return -1;
+        }
+    }
+
+    int testFieldNull() {
+        try {
+            return arrNull.length;
+        } catch (Throwable t) {
+            return 42;
+        }
+    }
+
+    int testFinalField() {
+        try {
+            return finalArr.length;
+        } catch (Throwable t) {
+            return -1;
+        }
+    }
+
+    int testFinalFieldNull() {
+        try {
+            return finalArrNull.length;
+        } catch (Throwable t) {
+            return 42;
+        }
+    }
+
+    int testStaticField() {
+        try {
+            return staticArr.length;
+        } catch (Throwable t) {
+            return -1;
+        }
+    }
+
+    int testStaticFieldNull() {
+        try {
+            return staticArrNull.length;
+        } catch (Throwable t) {
+            return 42;
+        }
+    }
+
+    int testStaticFinalField() {
+        try {
+            return staticFinalArr.length;
+        } catch (Throwable t) {
+            return -1;
+        }
+    }
+
+    int testStaticFinalFieldNull() {
+        try {
+            return staticFinalArrNull.length;
+        } catch (Throwable t) {
+            return 42;
+        }
+    }
+
+    int testLocal() {
+        int[] arr = new int[42];
+        try {
+            return arr.length;
+        } catch (Throwable t) {
+            return -1;
+        }
+    }
+
+    int testLocalNull() {
+        int[] arrNull = null;
+        try {
+            return arrNull.length;
+        } catch (Throwable t) {
+            return 42;
+        }
+    }
+
+
+}