Get a basic modification of dex file working
This allows the modification of a single classes methods through
transformation. One must ensure that the provided dex file only
contains one function and does not add or remove any methods or fields
and does not change the inheritance hierarchy in any way. The provided
dex file must verify and there must be no frames of the old code
present on any thread. These constraints are not checked or verified.
Breaking them might cause undefined behavior in all parts of the
runtime. Code that has been inlined in any way might not be replaced.
This feature is extremely experimental.
Bug: 31455788
Test: ./test/run-test --host 902-hello-transformation
Change-Id: I35133d24f6cdafdd2af9dc9863e15ba8493fc50e
diff --git a/runtime/openjdkjvmti/transform.h b/runtime/openjdkjvmti/transform.h
new file mode 100644
index 0000000..85bcb00
--- /dev/null
+++ b/runtime/openjdkjvmti/transform.h
@@ -0,0 +1,64 @@
+/* Copyright (C) 2016 The Android Open Source Project
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This file implements interfaces from the file jvmti.h. This implementation
+ * is licensed under the same terms as the file jvmti.h. The
+ * copyright and license information for the file jvmti.h follows.
+ *
+ * Copyright (c) 2003, 2011, 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. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+#ifndef ART_RUNTIME_OPENJDKJVMTI_TRANSFORM_H_
+#define ART_RUNTIME_OPENJDKJVMTI_TRANSFORM_H_
+
+#include <string>
+
+#include <jni.h>
+
+#include "art_jvmti.h"
+#include "jvmti.h"
+
+namespace openjdkjvmti {
+
+// Gets the data surrounding the given class.
+jvmtiError GetTransformationData(ArtJvmTiEnv* env,
+ jclass klass,
+ /*out*/std::string* location,
+ /*out*/JNIEnv** jni_env_ptr,
+ /*out*/jobject* loader,
+ /*out*/std::string* name,
+ /*out*/jobject* protection_domain,
+ /*out*/jint* data_len,
+ /*out*/unsigned char** dex_data);
+
+// Install the new dex file.
+jvmtiError MoveTransformedFileIntoRuntime(jclass jklass,
+ std::string original_location,
+ jint data_len,
+ unsigned char* dex_data);
+
+} // namespace openjdkjvmti
+
+#endif // ART_RUNTIME_OPENJDKJVMTI_TRANSFORM_H_
+