ART: Move openjdkjvmti to art/

Move libopenjdkjvmti out of the runtime directory. Let's not
pollute the runtime library.

Test: m test-art-host
Change-Id: Idb6b9cebcd61777bd3200437a2ae584a63a4a341

1 files changed, 207 insertions, 0 deletions

diff --git a/openjdkjvmti/ti_class_loader.cc b/openjdkjvmti/ti_class_loader.cc
new file mode 100644
index 0000000000..e81e4bc803
--- /dev/null
+++ b/openjdkjvmti/ti_class_loader.cc
@@ -0,0 +1,207 @@
+/* Copyright (C) 2017 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.
+ */
+
+#include "ti_class_loader.h"
+
+#include <limits>
+
+#include "android-base/stringprintf.h"
+
+#include "art_field-inl.h"
+#include "art_jvmti.h"
+#include "base/logging.h"
+#include "dex_file.h"
+#include "dex_file_types.h"
+#include "events-inl.h"
+#include "gc/allocation_listener.h"
+#include "gc/heap.h"
+#include "instrumentation.h"
+#include "jit/jit.h"
+#include "jit/jit_code_cache.h"
+#include "jni_env_ext-inl.h"
+#include "jvmti_allocator.h"
+#include "mirror/class.h"
+#include "mirror/class_ext.h"
+#include "mirror/object.h"
+#include "nativehelper/ScopedLocalRef.h"
+#include "object_lock.h"
+#include "runtime.h"
+#include "transform.h"
+
+namespace openjdkjvmti {
+
+bool ClassLoaderHelper::AddToClassLoader(art::Thread* self,
+                                         art::Handle<art::mirror::ClassLoader> loader,
+                                         const art::DexFile* dex_file) {
+  art::ScopedObjectAccessUnchecked soa(self);
+  art::StackHandleScope<3> hs(self);
+  if (art::ClassLinker::IsBootClassLoader(soa, loader.Get())) {
+    art::Runtime::Current()->GetClassLinker()->AppendToBootClassPath(self, *dex_file);
+    return true;
+  }
+  art::Handle<art::mirror::Object> java_dex_file_obj(
+      hs.NewHandle(FindSourceDexFileObject(self, loader)));
+  if (java_dex_file_obj.IsNull()) {
+    return false;
+  }
+  art::Handle<art::mirror::LongArray> old_cookie(hs.NewHandle(GetDexFileCookie(java_dex_file_obj)));
+  art::Handle<art::mirror::LongArray> cookie(hs.NewHandle(
+      AllocateNewDexFileCookie(self, old_cookie, dex_file)));
+  if (cookie.IsNull()) {
+    return false;
+  }
+  art::ScopedAssertNoThreadSuspension nts("Replacing cookie fields in j.l.DexFile object");
+  UpdateJavaDexFile(java_dex_file_obj.Get(), cookie.Get());
+  return true;
+}
+
+void ClassLoaderHelper::UpdateJavaDexFile(art::ObjPtr<art::mirror::Object> java_dex_file,
+                                          art::ObjPtr<art::mirror::LongArray> new_cookie) {
+  art::ArtField* internal_cookie_field = java_dex_file->GetClass()->FindDeclaredInstanceField(
+      "mInternalCookie", "Ljava/lang/Object;");
+  art::ArtField* cookie_field = java_dex_file->GetClass()->FindDeclaredInstanceField(
+      "mCookie", "Ljava/lang/Object;");
+  CHECK(internal_cookie_field != nullptr);
+  art::ObjPtr<art::mirror::LongArray> orig_internal_cookie(
+      internal_cookie_field->GetObject(java_dex_file)->AsLongArray());
+  art::ObjPtr<art::mirror::LongArray> orig_cookie(
+      cookie_field->GetObject(java_dex_file)->AsLongArray());
+  internal_cookie_field->SetObject<false>(java_dex_file, new_cookie);
+  if (!orig_cookie.IsNull()) {
+    cookie_field->SetObject<false>(java_dex_file, new_cookie);
+  }
+}
+
+art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::GetDexFileCookie(
+    art::Handle<art::mirror::Object> java_dex_file_obj) {
+  // mCookie is nulled out if the DexFile has been closed but mInternalCookie sticks around until
+  // the object is finalized. Since they always point to the same array if mCookie is not null we
+  // just use the mInternalCookie field. We will update one or both of these fields later.
+  art::ArtField* internal_cookie_field = java_dex_file_obj->GetClass()->FindDeclaredInstanceField(
+      "mInternalCookie", "Ljava/lang/Object;");
+  // TODO Add check that mCookie is either null or same as mInternalCookie
+  CHECK(internal_cookie_field != nullptr);
+  return internal_cookie_field->GetObject(java_dex_file_obj.Get())->AsLongArray();
+}
+
+art::ObjPtr<art::mirror::LongArray> ClassLoaderHelper::AllocateNewDexFileCookie(
+    art::Thread* self,
+    art::Handle<art::mirror::LongArray> cookie,
+    const art::DexFile* dex_file) {
+  art::StackHandleScope<1> hs(self);
+  CHECK(cookie != nullptr);
+  CHECK_GE(cookie->GetLength(), 1);
+  art::Handle<art::mirror::LongArray> new_cookie(
+      hs.NewHandle(art::mirror::LongArray::Alloc(self, cookie->GetLength() + 1)));
+  if (new_cookie == nullptr) {
+    self->AssertPendingOOMException();
+    return nullptr;
+  }
+  // Copy the oat-dex field at the start.
+  new_cookie->SetWithoutChecks<false>(0, cookie->GetWithoutChecks(0));
+  // This must match the casts in runtime/native/dalvik_system_DexFile.cc:ConvertDexFilesToJavaArray
+  new_cookie->SetWithoutChecks<false>(
+      1, static_cast<int64_t>(reinterpret_cast<uintptr_t>(dex_file)));
+  new_cookie->Memcpy(2, cookie.Get(), 1, cookie->GetLength() - 1);
+  return new_cookie.Get();
+}
+
+// TODO This should return the actual source java.lang.DexFile object for the klass being loaded.
+art::ObjPtr<art::mirror::Object> ClassLoaderHelper::FindSourceDexFileObject(
+    art::Thread* self, art::Handle<art::mirror::ClassLoader> loader) {
+  const char* dex_path_list_element_array_name = "[Ldalvik/system/DexPathList$Element;";
+  const char* dex_path_list_element_name = "Ldalvik/system/DexPathList$Element;";
+  const char* dex_file_name = "Ldalvik/system/DexFile;";
+  const char* dex_path_list_name = "Ldalvik/system/DexPathList;";
+  const char* dex_class_loader_name = "Ldalvik/system/BaseDexClassLoader;";
+
+  CHECK(!self->IsExceptionPending());
+  art::StackHandleScope<5> hs(self);
+  art::ClassLinker* class_linker = art::Runtime::Current()->GetClassLinker();
+
+  art::Handle<art::mirror::ClassLoader> null_loader(hs.NewHandle<art::mirror::ClassLoader>(
+      nullptr));
+  art::Handle<art::mirror::Class> base_dex_loader_class(hs.NewHandle(class_linker->FindClass(
+      self, dex_class_loader_name, null_loader)));
+
+  // Get all the ArtFields so we can look in the BaseDexClassLoader
+  art::ArtField* path_list_field = base_dex_loader_class->FindDeclaredInstanceField(
+      "pathList", dex_path_list_name);
+  CHECK(path_list_field != nullptr);
+
+  art::ArtField* dex_path_list_element_field =
+      class_linker->FindClass(self, dex_path_list_name, null_loader)
+        ->FindDeclaredInstanceField("dexElements", dex_path_list_element_array_name);
+  CHECK(dex_path_list_element_field != nullptr);
+
+  art::ArtField* element_dex_file_field =
+      class_linker->FindClass(self, dex_path_list_element_name, null_loader)
+        ->FindDeclaredInstanceField("dexFile", dex_file_name);
+  CHECK(element_dex_file_field != nullptr);
+
+  // Check if loader is a BaseDexClassLoader
+  art::Handle<art::mirror::Class> loader_class(hs.NewHandle(loader->GetClass()));
+  // Currently only base_dex_loader is allowed to actually define classes but if this changes in the
+  // future we should make sure to support all class loader types.
+  if (!loader_class->IsSubClass(base_dex_loader_class.Get())) {
+    LOG(ERROR) << "The classloader is not a BaseDexClassLoader which is currently the only "
+               << "supported class loader type!";
+    return nullptr;
+  }
+  // Start navigating the fields of the loader (now known to be a BaseDexClassLoader derivative)
+  art::Handle<art::mirror::Object> path_list(
+      hs.NewHandle(path_list_field->GetObject(loader.Get())));
+  CHECK(path_list != nullptr);
+  CHECK(!self->IsExceptionPending());
+  art::Handle<art::mirror::ObjectArray<art::mirror::Object>> dex_elements_list(hs.NewHandle(
+      dex_path_list_element_field->GetObject(path_list.Get())->
+      AsObjectArray<art::mirror::Object>()));
+  CHECK(!self->IsExceptionPending());
+  CHECK(dex_elements_list != nullptr);
+  size_t num_elements = dex_elements_list->GetLength();
+  // Iterate over the DexPathList$Element to find the right one
+  for (size_t i = 0; i < num_elements; i++) {
+    art::ObjPtr<art::mirror::Object> current_element = dex_elements_list->Get(i);
+    CHECK(!current_element.IsNull());
+    // TODO It would be cleaner to put the art::DexFile into the dalvik.system.DexFile the class
+    // comes from but it is more annoying because we would need to find this class. It is not
+    // necessary for proper function since we just need to be in front of the classes old dex file
+    // in the path.
+    art::ObjPtr<art::mirror::Object> first_dex_file(
+        element_dex_file_field->GetObject(current_element));
+    if (!first_dex_file.IsNull()) {
+      return first_dex_file;
+    }
+  }
+  return nullptr;
+}
+
+}  // namespace openjdkjvmti