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      1 /* Copyright (C) 2017 The Android Open Source Project
      2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      3  *
      4  * This file implements interfaces from the file jvmti.h. This implementation
      5  * is licensed under the same terms as the file jvmti.h.  The
      6  * copyright and license information for the file jvmti.h follows.
      7  *
      8  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
      9  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     10  *
     11  * This code is free software; you can redistribute it and/or modify it
     12  * under the terms of the GNU General Public License version 2 only, as
     13  * published by the Free Software Foundation.  Oracle designates this
     14  * particular file as subject to the "Classpath" exception as provided
     15  * by Oracle in the LICENSE file that accompanied this code.
     16  *
     17  * This code is distributed in the hope that it will be useful, but WITHOUT
     18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     20  * version 2 for more details (a copy is included in the LICENSE file that
     21  * accompanied this code).
     22  *
     23  * You should have received a copy of the GNU General Public License version
     24  * 2 along with this work; if not, write to the Free Software Foundation,
     25  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     26  *
     27  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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     31 
     32 #ifndef ART_OPENJDKJVMTI_TI_CLASS_LOADER_H_
     33 #define ART_OPENJDKJVMTI_TI_CLASS_LOADER_H_
     34 
     35 #include <string>
     36 
     37 #include <jni.h>
     38 
     39 #include "art_jvmti.h"
     40 #include "art_method.h"
     41 #include "base/array_slice.h"
     42 #include "class_linker.h"
     43 #include "dex/dex_file.h"
     44 #include "dex/utf.h"
     45 #include "gc_root-inl.h"
     46 #include "globals.h"
     47 #include "jni_env_ext-inl.h"
     48 #include "jvmti.h"
     49 #include "linear_alloc.h"
     50 #include "mem_map.h"
     51 #include "mirror/array-inl.h"
     52 #include "mirror/array.h"
     53 #include "mirror/class-inl.h"
     54 #include "mirror/class.h"
     55 #include "mirror/class_loader-inl.h"
     56 #include "mirror/string-inl.h"
     57 #include "oat_file.h"
     58 #include "obj_ptr.h"
     59 #include "scoped_thread_state_change-inl.h"
     60 #include "stack.h"
     61 #include "thread_list.h"
     62 #include "ti_class_definition.h"
     63 #include "transform.h"
     64 #include "utils/dex_cache_arrays_layout-inl.h"
     65 
     66 namespace openjdkjvmti {
     67 
     68 // Class that can redefine a single class's methods.
     69 // TODO We should really make this be driven by an outside class so we can do multiple classes at
     70 // the same time and have less required cleanup.
     71 class ClassLoaderHelper {
     72  public:
     73   static bool AddToClassLoader(art::Thread* self,
     74                                art::Handle<art::mirror::ClassLoader> loader,
     75                                const art::DexFile* dex_file)
     76       REQUIRES_SHARED(art::Locks::mutator_lock_);
     77 
     78   // Finds a java.lang.DexFile object that is associated with the given ClassLoader. Each of these
     79   // j.l.DexFile objects holds several art::DexFile*s in it.
     80   // TODO This should return the actual source java.lang.DexFile object for the klass being loaded.
     81   static art::ObjPtr<art::mirror::Object> FindSourceDexFileObject(
     82       art::Thread* self, art::Handle<art::mirror::ClassLoader> loader)
     83       REQUIRES_SHARED(art::Locks::mutator_lock_);
     84 
     85   // Calls visitor on each java.lang.DexFile associated with the given loader. The visitor should
     86   // return true to continue on to the next DexFile or false to stop iterating.
     87   template<typename Visitor>
     88   static inline void VisitDexFileObjects(art::Thread* self,
     89                                          art::Handle<art::mirror::ClassLoader> loader,
     90                                          const Visitor& visitor)
     91       REQUIRES_SHARED(art::Locks::mutator_lock_);
     92 
     93   static art::ObjPtr<art::mirror::LongArray> GetDexFileCookie(
     94       art::Handle<art::mirror::Object> java_dex_file) REQUIRES_SHARED(art::Locks::mutator_lock_);
     95 
     96   static art::ObjPtr<art::mirror::LongArray> AllocateNewDexFileCookie(
     97       art::Thread* self,
     98       art::Handle<art::mirror::LongArray> old_dex_file_cookie,
     99       const art::DexFile* new_dex_file) REQUIRES_SHARED(art::Locks::mutator_lock_);
    100 
    101   static void UpdateJavaDexFile(art::ObjPtr<art::mirror::Object> java_dex_file,
    102                                 art::ObjPtr<art::mirror::LongArray> new_cookie)
    103       REQUIRES(art::Roles::uninterruptible_) REQUIRES_SHARED(art::Locks::mutator_lock_);
    104 
    105  private:
    106   static art::ObjPtr<art::mirror::ObjectArray<art::mirror::Object>> GetDexElementList(
    107       art::Thread* self, art::Handle<art::mirror::ClassLoader> loader)
    108         REQUIRES_SHARED(art::Locks::mutator_lock_);
    109 };
    110 
    111 }  // namespace openjdkjvmti
    112 #endif  // ART_OPENJDKJVMTI_TI_CLASS_LOADER_H_
    113