--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.test/src/org/graalvm/compiler/replacements/test/MethodSubstitutionTest.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 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 org.graalvm.compiler.replacements.test;
+
+import java.lang.reflect.InvocationTargetException;
+
+import org.graalvm.compiler.api.replacements.MethodSubstitution;
+import org.graalvm.compiler.core.test.GraalCompilerTest;
+import org.graalvm.compiler.debug.DebugContext;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.nodes.Invoke;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.common.DeadCodeEliminationPhase;
+import org.graalvm.compiler.phases.common.LoweringPhase;
+import org.graalvm.compiler.phases.common.inlining.InliningPhase;
+import org.graalvm.compiler.phases.tiers.HighTierContext;
+import org.graalvm.compiler.replacements.nodes.MacroNode;
+
+import jdk.vm.ci.code.InstalledCode;
+import jdk.vm.ci.code.InvalidInstalledCodeException;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+
+/**
+ * Tests if {@link MethodSubstitution}s are inlined correctly. Most test cases only assert that
+ * there are no remaining invocations in the graph. This is sufficient if the method that is being
+ * substituted is a native method. For Java methods, additional checks are necessary.
+ */
+public abstract class MethodSubstitutionTest extends GraalCompilerTest {
+
+    @SuppressWarnings("try")
+    protected StructuredGraph testGraph(final String snippet) {
+        DebugContext debug = getDebugContext();
+        try (DebugContext.Scope s = debug.scope("MethodSubstitutionTest", getResolvedJavaMethod(snippet))) {
+            StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES, debug);
+            HighTierContext context = getDefaultHighTierContext();
+            debug.dump(DebugContext.BASIC_LEVEL, graph, "Graph");
+            new InliningPhase(new CanonicalizerPhase()).apply(graph, context);
+            debug.dump(DebugContext.BASIC_LEVEL, graph, "Graph");
+            new CanonicalizerPhase().apply(graph, context);
+            new DeadCodeEliminationPhase().apply(graph);
+            // Try to ensure any macro nodes are lowered to expose any resulting invokes
+            if (graph.getNodes().filter(MacroNode.class).isNotEmpty()) {
+                new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
+            }
+            if (graph.getNodes().filter(MacroNode.class).isNotEmpty()) {
+                new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.MID_TIER).apply(graph, context);
+            }
+            assertNotInGraph(graph, MacroNode.class);
+            assertNotInGraph(graph, Invoke.class);
+            return graph;
+        } catch (Throwable e) {
+            throw debug.handle(e);
+        }
+    }
+
+    protected static StructuredGraph assertNotInGraph(StructuredGraph graph, Class<?> clazz) {
+        for (Node node : graph.getNodes()) {
+            if (clazz.isInstance(node)) {
+                fail(node.toString());
+            }
+        }
+        return graph;
+    }
+
+    protected void testSubstitution(String testMethodName, Class<?> intrinsicClass, Class<?> holder, String methodName, Class<?>[] parameterTypes, boolean optional, Object[] args1, Object[] args2) {
+        ResolvedJavaMethod realMethod = getResolvedJavaMethod(holder, methodName, parameterTypes);
+        ResolvedJavaMethod testMethod = getResolvedJavaMethod(testMethodName);
+        StructuredGraph graph = testGraph(testMethodName);
+
+        // Check to see if the resulting graph contains the expected node
+        StructuredGraph replacement = getReplacements().getSubstitution(realMethod, -1);
+        if (replacement == null && !optional) {
+            assertInGraph(graph, intrinsicClass);
+        }
+
+        // Force compilation
+        InstalledCode code = getCode(testMethod);
+        assert optional || code != null;
+
+        for (int i = 0; i < args1.length; i++) {
+            Object arg1 = args1[i];
+            Object arg2 = args2[i];
+            Object expected = invokeSafe(realMethod, null, arg1, arg2);
+            // Verify that the original method and the substitution produce the same value
+            assertDeepEquals(expected, invokeSafe(testMethod, null, arg1, arg2));
+            // Verify that the generated code and the original produce the same value
+            assertDeepEquals(expected, executeVarargsSafe(code, arg1, arg2));
+        }
+    }
+
+    protected static StructuredGraph assertInGraph(StructuredGraph graph, Class<?> clazz) {
+        for (Node node : graph.getNodes()) {
+            if (clazz.isInstance(node)) {
+                return graph;
+            }
+        }
+        fail("Graph does not contain a node of class " + clazz.getName());
+        return graph;
+    }
+
+    protected static Object executeVarargsSafe(InstalledCode code, Object... args) {
+        try {
+            return code.executeVarargs(args);
+        } catch (InvalidInstalledCodeException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    protected Object invokeSafe(ResolvedJavaMethod method, Object receiver, Object... args) {
+        try {
+            return invoke(method, receiver, args);
+        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | InstantiationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}