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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
     28  * or visit www.oracle.com if you need additional information or have any
     29  * questions.
     30  */
     31 
     32 #ifndef ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_DEFINITION_H_
     33 #define ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_DEFINITION_H_
     34 
     35 #include "art_jvmti.h"
     36 
     37 #include "base/array_ref.h"
     38 
     39 namespace openjdkjvmti {
     40 
     41 // A struct that stores data needed for redefining/transforming classes. This structure should only
     42 // even be accessed from a single thread and must not survive past the completion of the
     43 // redefinition/retransformation function that created it.
     44 class ArtClassDefinition {
     45  public:
     46   ArtClassDefinition()
     47       : klass_(nullptr),
     48         loader_(nullptr),
     49         name_(),
     50         protection_domain_(nullptr),
     51         dex_len_(0),
     52         dex_data_(nullptr),
     53         original_dex_file_memory_(nullptr),
     54         original_dex_file_(),
     55         redefined_(false) {}
     56 
     57   jvmtiError Init(ArtJvmTiEnv* env, jclass klass);
     58   jvmtiError Init(ArtJvmTiEnv* env, const jvmtiClassDefinition& def);
     59 
     60   ArtClassDefinition(ArtClassDefinition&& o) = default;
     61   ArtClassDefinition& operator=(ArtClassDefinition&& o) = default;
     62 
     63   void SetNewDexData(ArtJvmTiEnv* env, jint new_dex_len, unsigned char* new_dex_data) {
     64     DCHECK(IsInitialized());
     65     if (new_dex_data == nullptr) {
     66       return;
     67     } else if (new_dex_data != dex_data_.get() || new_dex_len != dex_len_) {
     68       dex_len_ = new_dex_len;
     69       dex_data_ = MakeJvmtiUniquePtr(env, new_dex_data);
     70     }
     71   }
     72 
     73   art::ArrayRef<const unsigned char> GetNewOriginalDexFile() const {
     74     DCHECK(IsInitialized());
     75     if (redefined_) {
     76       return original_dex_file_;
     77     } else {
     78       return art::ArrayRef<const unsigned char>();
     79     }
     80   }
     81 
     82   bool IsModified() const;
     83 
     84   bool IsInitialized() const {
     85     return klass_ != nullptr;
     86   }
     87 
     88   jclass GetClass() const {
     89     DCHECK(IsInitialized());
     90     return klass_;
     91   }
     92 
     93   jobject GetLoader() const {
     94     DCHECK(IsInitialized());
     95     return loader_;
     96   }
     97 
     98   const std::string& GetName() const {
     99     DCHECK(IsInitialized());
    100     return name_;
    101   }
    102 
    103   jobject GetProtectionDomain() const {
    104     DCHECK(IsInitialized());
    105     return protection_domain_;
    106   }
    107 
    108   art::ArrayRef<const unsigned char> GetDexData() const {
    109     DCHECK(IsInitialized());
    110     return art::ArrayRef<const unsigned char>(dex_data_.get(), dex_len_);
    111   }
    112 
    113  private:
    114   jvmtiError InitCommon(ArtJvmTiEnv* env, jclass klass);
    115 
    116   jclass klass_;
    117   jobject loader_;
    118   std::string name_;
    119   jobject protection_domain_;
    120   jint dex_len_;
    121   JvmtiUniquePtr<unsigned char> dex_data_;
    122   JvmtiUniquePtr<unsigned char> original_dex_file_memory_;
    123   art::ArrayRef<const unsigned char> original_dex_file_;
    124   bool redefined_;
    125 
    126   DISALLOW_COPY_AND_ASSIGN(ArtClassDefinition);
    127 };
    128 
    129 }  // namespace openjdkjvmti
    130 
    131 #endif  // ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_DEFINITION_H_
    132