Implement first kind of polymorphic inlining.

Add HClassTableGet to fetch an ArtMethod from the vtable or imt,
and compare it to the only method the profiling saw.

Change-Id: I76afd3689178f10e3be048aa3ac9a97c6f63295d

1 files changed, 95 insertions, 0 deletions

diff --git a/test/566-polymorphic-inlining/src/Main.java b/test/566-polymorphic-inlining/src/Main.java
new file mode 100644
index 0000000000..7283e86227
--- /dev/null
+++ b/test/566-polymorphic-inlining/src/Main.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+interface Itf {
+  public Class sameInvokeInterface();
+}
+
+public class Main implements Itf {
+  public static void assertEquals(Object expected, Object actual) {
+    if (expected != actual) {
+      throw new Error("Expected " + expected  + ", got " + actual);
+    }
+  }
+
+  public static void main(String[] args) throws Exception {
+    System.loadLibrary(args[0]);
+    Main[] mains = new Main[3];
+    Itf[] itfs = new Itf[3];
+    itfs[0] = mains[0] = new Main();
+    itfs[1] = mains[1] = new Subclass();
+    itfs[2] = mains[2] = new OtherSubclass();
+
+    // Make testInvokeVirtual and testInvokeInterface hot to get them jitted.
+    // We pass Main and Subclass to get polymorphic inlining based on calling
+    // the same method.
+    for (int i = 0; i < 10000; ++i) {
+      testInvokeVirtual(mains[0]);
+      testInvokeVirtual(mains[1]);
+      testInvokeInterface(itfs[0]);
+      testInvokeInterface(itfs[1]);
+    }
+
+    ensureJittedAndPolymorphicInline();
+
+    // At this point, the JIT should have compiled both methods, and inline
+    // sameInvokeVirtual and sameInvokeInterface.
+    assertEquals(Main.class, testInvokeVirtual(mains[0]));
+    assertEquals(Main.class, testInvokeVirtual(mains[1]));
+
+    assertEquals(Itf.class, testInvokeInterface(itfs[0]));
+    assertEquals(Itf.class, testInvokeInterface(itfs[1]));
+
+    // This will trigger a deoptimization of the compiled code.
+    assertEquals(OtherSubclass.class, testInvokeVirtual(mains[2]));
+    assertEquals(OtherSubclass.class, testInvokeInterface(itfs[2]));
+  }
+
+  public Class sameInvokeVirtual() {
+    field.getClass(); // null check to ensure we get an inlined frame in the CodeInfo
+    return Main.class;
+  }
+
+  public Class sameInvokeInterface() {
+    field.getClass(); // null check to ensure we get an inlined frame in the CodeInfo
+    return Itf.class;
+  }
+
+  public static Class testInvokeInterface(Itf i) {
+    return i.sameInvokeInterface();
+  }
+
+  public static Class testInvokeVirtual(Main m) {
+    return m.sameInvokeVirtual();
+  }
+
+  public Object field = new Object();
+
+  public static native void ensureJittedAndPolymorphicInline();
+}
+
+class Subclass extends Main {
+}
+
+class OtherSubclass extends Main {
+  public Class sameInvokeVirtual() {
+    return OtherSubclass.class;
+  }
+
+  public Class sameInvokeInterface() {
+    return OtherSubclass.class;
+  }
+}