diff options
Diffstat (limited to 'openjdkjvmti/ti_field.cc')
| -rw-r--r-- | openjdkjvmti/ti_field.cc | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/openjdkjvmti/ti_field.cc b/openjdkjvmti/ti_field.cc new file mode 100644 index 0000000000..c45b926695 --- /dev/null +++ b/openjdkjvmti/ti_field.cc @@ -0,0 +1,254 @@ +/* Copyright (C) 2016 The Android Open Source Project + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This file implements interfaces from the file jvmti.h. This implementation + * is licensed under the same terms as the file jvmti.h. The + * copyright and license information for the file jvmti.h follows. + * + * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +#include "ti_field.h" + +#include "art_field-inl.h" +#include "art_jvmti.h" +#include "base/enums.h" +#include "dex_file_annotations.h" +#include "jni_internal.h" +#include "mirror/object_array-inl.h" +#include "modifiers.h" +#include "scoped_thread_state_change-inl.h" +#include "thread-current-inl.h" + +namespace openjdkjvmti { + +// Note: For all these functions, we could do a check that the field actually belongs to the given +// class. But the spec seems to assume a certain encoding of the field ID, and so doesn't +// specify any errors. + +jvmtiError FieldUtil::GetFieldName(jvmtiEnv* env, + jclass klass, + jfieldID field, + char** name_ptr, + char** signature_ptr, + char** generic_ptr) { + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + + art::ScopedObjectAccess soa(art::Thread::Current()); + art::ArtField* art_field = art::jni::DecodeArtField(field); + + JvmtiUniquePtr<char[]> name_copy; + if (name_ptr != nullptr) { + const char* field_name = art_field->GetName(); + if (field_name == nullptr) { + field_name = "<error>"; + } + jvmtiError ret; + name_copy = CopyString(env, field_name, &ret); + if (name_copy == nullptr) { + return ret; + } + *name_ptr = name_copy.get(); + } + + JvmtiUniquePtr<char[]> signature_copy; + if (signature_ptr != nullptr) { + const char* sig = art_field->GetTypeDescriptor(); + jvmtiError ret; + signature_copy = CopyString(env, sig, &ret); + if (signature_copy == nullptr) { + return ret; + } + *signature_ptr = signature_copy.get(); + } + + if (generic_ptr != nullptr) { + *generic_ptr = nullptr; + if (!art_field->GetDeclaringClass()->IsProxyClass()) { + art::mirror::ObjectArray<art::mirror::String>* str_array = + art::annotations::GetSignatureAnnotationForField(art_field); + if (str_array != nullptr) { + std::ostringstream oss; + for (int32_t i = 0; i != str_array->GetLength(); ++i) { + oss << str_array->Get(i)->ToModifiedUtf8(); + } + std::string output_string = oss.str(); + jvmtiError ret; + JvmtiUniquePtr<char[]> copy = CopyString(env, output_string.c_str(), &ret); + if (copy == nullptr) { + return ret; + } + *generic_ptr = copy.release(); + } else if (soa.Self()->IsExceptionPending()) { + // TODO: Should we report an error here? + soa.Self()->ClearException(); + } + } + } + + // Everything is fine, release the buffers. + name_copy.release(); + signature_copy.release(); + + return ERR(NONE); +} + +jvmtiError FieldUtil::GetFieldDeclaringClass(jvmtiEnv* env ATTRIBUTE_UNUSED, + jclass klass, + jfieldID field, + jclass* declaring_class_ptr) { + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + if (declaring_class_ptr == nullptr) { + return ERR(NULL_POINTER); + } + + art::ScopedObjectAccess soa(art::Thread::Current()); + art::ArtField* art_field = art::jni::DecodeArtField(field); + art::ObjPtr<art::mirror::Class> field_klass = art_field->GetDeclaringClass(); + + *declaring_class_ptr = soa.AddLocalReference<jclass>(field_klass); + + return ERR(NONE); +} + +jvmtiError FieldUtil::GetFieldModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED, + jclass klass, + jfieldID field, + jint* modifiers_ptr) { + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + if (modifiers_ptr == nullptr) { + return ERR(NULL_POINTER); + } + + art::ScopedObjectAccess soa(art::Thread::Current()); + art::ArtField* art_field = art::jni::DecodeArtField(field); + // Note: Keep this code in sync with Field.getModifiers. + uint32_t modifiers = art_field->GetAccessFlags() & 0xFFFF; + + *modifiers_ptr = modifiers; + return ERR(NONE); +} + +jvmtiError FieldUtil::IsFieldSynthetic(jvmtiEnv* env ATTRIBUTE_UNUSED, + jclass klass, + jfieldID field, + jboolean* is_synthetic_ptr) { + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + if (is_synthetic_ptr == nullptr) { + return ERR(NULL_POINTER); + } + + art::ScopedObjectAccess soa(art::Thread::Current()); + art::ArtField* art_field = art::jni::DecodeArtField(field); + uint32_t modifiers = art_field->GetAccessFlags(); + + *is_synthetic_ptr = ((modifiers & art::kAccSynthetic) != 0) ? JNI_TRUE : JNI_FALSE; + return ERR(NONE); +} + +jvmtiError FieldUtil::SetFieldModificationWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { + ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + auto res_pair = env->modify_watched_fields.insert(art::jni::DecodeArtField(field)); + if (!res_pair.second) { + // Didn't get inserted because it's already present! + return ERR(DUPLICATE); + } + return OK; +} + +jvmtiError FieldUtil::ClearFieldModificationWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { + ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + auto pos = env->modify_watched_fields.find(art::jni::DecodeArtField(field)); + if (pos == env->modify_watched_fields.end()) { + return ERR(NOT_FOUND); + } + env->modify_watched_fields.erase(pos); + return OK; +} + +jvmtiError FieldUtil::SetFieldAccessWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { + ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + auto res_pair = env->access_watched_fields.insert(art::jni::DecodeArtField(field)); + if (!res_pair.second) { + // Didn't get inserted because it's already present! + return ERR(DUPLICATE); + } + return OK; +} + +jvmtiError FieldUtil::ClearFieldAccessWatch(jvmtiEnv* jenv, jclass klass, jfieldID field) { + ArtJvmTiEnv* env = ArtJvmTiEnv::AsArtJvmTiEnv(jenv); + if (klass == nullptr) { + return ERR(INVALID_CLASS); + } + if (field == nullptr) { + return ERR(INVALID_FIELDID); + } + auto pos = env->access_watched_fields.find(art::jni::DecodeArtField(field)); + if (pos == env->access_watched_fields.end()) { + return ERR(NOT_FOUND); + } + env->access_watched_fields.erase(pos); + return OK; +} + +} // namespace openjdkjvmti |