1 /* Copyright (C) 2016 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 #include <unordered_map> 33 #include <unordered_set> 34 35 #include "transform.h" 36 37 #include "art_method.h" 38 #include "base/array_ref.h" 39 #include "class_linker.h" 40 #include "dex_file.h" 41 #include "dex_file_types.h" 42 #include "events-inl.h" 43 #include "gc_root-inl.h" 44 #include "globals.h" 45 #include "jni_env_ext-inl.h" 46 #include "jvalue.h" 47 #include "jvmti.h" 48 #include "linear_alloc.h" 49 #include "mem_map.h" 50 #include "mirror/array.h" 51 #include "mirror/class-inl.h" 52 #include "mirror/class_ext.h" 53 #include "mirror/class_loader-inl.h" 54 #include "mirror/string-inl.h" 55 #include "oat_file.h" 56 #include "scoped_thread_state_change-inl.h" 57 #include "stack.h" 58 #include "thread_list.h" 59 #include "ti_redefine.h" 60 #include "transform.h" 61 #include "utf.h" 62 #include "utils/dex_cache_arrays_layout-inl.h" 63 64 namespace openjdkjvmti { 65 66 jvmtiError Transformer::RetransformClassesDirect( 67 ArtJvmTiEnv* env, 68 EventHandler* event_handler, 69 art::Thread* self, 70 /*in-out*/std::vector<ArtClassDefinition>* definitions) { 71 for (ArtClassDefinition& def : *definitions) { 72 jint new_len = -1; 73 unsigned char* new_data = nullptr; 74 art::ArrayRef<const unsigned char> dex_data = def.GetDexData(); 75 event_handler->DispatchEvent<ArtJvmtiEvent::kClassFileLoadHookRetransformable>( 76 self, 77 GetJniEnv(env), 78 def.GetClass(), 79 def.GetLoader(), 80 def.GetName().c_str(), 81 def.GetProtectionDomain(), 82 static_cast<jint>(dex_data.size()), 83 dex_data.data(), 84 /*out*/&new_len, 85 /*out*/&new_data); 86 def.SetNewDexData(env, new_len, new_data); 87 } 88 return OK; 89 } 90 91 jvmtiError Transformer::RetransformClasses(ArtJvmTiEnv* env, 92 EventHandler* event_handler, 93 art::Runtime* runtime, 94 art::Thread* self, 95 jint class_count, 96 const jclass* classes, 97 /*out*/std::string* error_msg) { 98 if (env == nullptr) { 99 *error_msg = "env was null!"; 100 return ERR(INVALID_ENVIRONMENT); 101 } else if (class_count < 0) { 102 *error_msg = "class_count was less then 0"; 103 return ERR(ILLEGAL_ARGUMENT); 104 } else if (class_count == 0) { 105 // We don't actually need to do anything. Just return OK. 106 return OK; 107 } else if (classes == nullptr) { 108 *error_msg = "null classes!"; 109 return ERR(NULL_POINTER); 110 } 111 // A holder that will Deallocate all the class bytes buffers on destruction. 112 std::vector<ArtClassDefinition> definitions; 113 jvmtiError res = OK; 114 for (jint i = 0; i < class_count; i++) { 115 jboolean is_modifiable = JNI_FALSE; 116 res = env->IsModifiableClass(classes[i], &is_modifiable); 117 if (res != OK) { 118 return res; 119 } else if (!is_modifiable) { 120 return ERR(UNMODIFIABLE_CLASS); 121 } 122 ArtClassDefinition def; 123 res = def.Init(env, classes[i]); 124 if (res != OK) { 125 return res; 126 } 127 definitions.push_back(std::move(def)); 128 } 129 res = RetransformClassesDirect(env, event_handler, self, &definitions); 130 if (res != OK) { 131 return res; 132 } 133 return Redefiner::RedefineClassesDirect(env, runtime, self, definitions, error_msg); 134 } 135 136 // TODO Move this somewhere else, ti_class? 137 jvmtiError GetClassLocation(ArtJvmTiEnv* env, jclass klass, /*out*/std::string* location) { 138 JNIEnv* jni_env = nullptr; 139 jint ret = env->art_vm->GetEnv(reinterpret_cast<void**>(&jni_env), JNI_VERSION_1_1); 140 if (ret != JNI_OK) { 141 // TODO Different error might be better? 142 return ERR(INTERNAL); 143 } 144 art::ScopedObjectAccess soa(jni_env); 145 art::StackHandleScope<1> hs(art::Thread::Current()); 146 art::Handle<art::mirror::Class> hs_klass(hs.NewHandle(soa.Decode<art::mirror::Class>(klass))); 147 const art::DexFile& dex = hs_klass->GetDexFile(); 148 *location = dex.GetLocation(); 149 return OK; 150 } 151 152 } // namespace openjdkjvmti 153
