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