--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.tests/src/com/oracle/graal/compiler/tests/cfg/SimpleCFGTest.java	Thu May 31 18:24:53 2012 +0200
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2012, 2012, 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.
+ */
+package com.oracle.graal.compiler.tests.cfg;
+
+import static org.junit.Assert.*;
+
+import org.junit.*;
+
+import com.oracle.graal.lir.cfg.*;
+import com.oracle.graal.nodes.*;
+
+public class SimpleCFGTest {
+
+    @Test
+    public void testImplies() {
+        StructuredGraph graph = new StructuredGraph();
+
+        EndNode trueEnd = graph.add(new EndNode());
+        EndNode falseEnd = graph.add(new EndNode());
+
+        BeginNode trueBegin = graph.add(new BeginNode());
+        trueBegin.setNext(trueEnd);
+        BeginNode falseBegin = graph.add(new BeginNode());
+        falseBegin.setNext(falseEnd);
+
+        IfNode ifNode = graph.add(new IfNode(null, trueBegin, falseBegin, 0.5));
+        graph.start().setNext(ifNode);
+
+        MergeNode merge = graph.add(new MergeNode());
+        merge.addForwardEnd(trueEnd);
+        merge.addForwardEnd(falseEnd);
+        ReturnNode returnNode = graph.add(new ReturnNode(null));
+        merge.setNext(returnNode);
+
+        ControlFlowGraph cfg = ControlFlowGraph.compute(graph, true, true, true, true);
+
+        Block[] blocks = cfg.getBlocks();
+        // check number of blocks
+        assertEquals(4, blocks.length);
+
+        // check block - node assignment
+        assertEquals(blocks[0], cfg.blockFor(graph.start()));
+        assertEquals(blocks[0], cfg.blockFor(ifNode));
+        assertEquals(blocks[1], cfg.blockFor(trueBegin));
+        assertEquals(blocks[1], cfg.blockFor(trueEnd));
+        assertEquals(blocks[2], cfg.blockFor(falseBegin));
+        assertEquals(blocks[2], cfg.blockFor(falseEnd));
+        assertEquals(blocks[3], cfg.blockFor(merge));
+        assertEquals(blocks[3], cfg.blockFor(returnNode));
+
+        // check dominators
+        assertDominator(blocks[0], null);
+        assertDominator(blocks[1], blocks[0]);
+        assertDominator(blocks[2], blocks[0]);
+        assertDominator(blocks[3], blocks[0]);
+
+        // check dominated
+        assertDominatedSize(blocks[0], 3);
+        assertDominatedSize(blocks[1], 0);
+        assertDominatedSize(blocks[2], 0);
+        assertDominatedSize(blocks[3], 0);
+
+        // check postdominators
+        assertPostdominator(blocks[0], blocks[3]);
+        assertPostdominator(blocks[1], blocks[3]);
+        assertPostdominator(blocks[2], blocks[3]);
+        assertPostdominator(blocks[3], null);
+    }
+
+    public static void assertDominator(Block block, Block expectedDominator) {
+        assertEquals("dominator of " + block, expectedDominator, block.getDominator());
+    }
+
+    public static void assertDominatedSize(Block block, int size) {
+        assertEquals("number of dominated blocks of " + block, size, block.getDominated().size());
+    }
+
+    public static void assertPostdominator(Block block, Block expectedPostdominator) {
+        assertEquals("postdominator of " + block, expectedPostdominator, block.getPostdominator());
+    }
+
+}