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