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 "ti_field.h"
33
34#include "art_jvmti.h"
35#include "art_field-inl.h"
36#include "base/enums.h"
37#include "dex_file_annotations.h"
38#include "jni_internal.h"
39#include "mirror/object_array-inl.h"
40#include "modifiers.h"
41#include "scoped_thread_state_change-inl.h"
42#include "thread-inl.h"
43
44namespace openjdkjvmti {
45
46// Note: For all these functions, we could do a check that the field actually belongs to the given
47//       class. But the spec seems to assume a certain encoding of the field ID, and so doesn't
48//       specify any errors.
49
50jvmtiError FieldUtil::GetFieldName(jvmtiEnv* env,
51                                   jclass klass,
52                                   jfieldID field,
53                                   char** name_ptr,
54                                   char** signature_ptr,
55                                   char** generic_ptr) {
56  if (klass == nullptr) {
57    return ERR(INVALID_CLASS);
58  }
59  if (field == nullptr) {
60    return ERR(INVALID_FIELDID);
61  }
62
63  art::ScopedObjectAccess soa(art::Thread::Current());
64  art::ArtField* art_field = art::jni::DecodeArtField(field);
65
66  JvmtiUniquePtr<char[]> name_copy;
67  if (name_ptr != nullptr) {
68    const char* field_name = art_field->GetName();
69    if (field_name == nullptr) {
70      field_name = "<error>";
71    }
72    jvmtiError ret;
73    name_copy = CopyString(env, field_name, &ret);
74    if (name_copy == nullptr) {
75      return ret;
76    }
77    *name_ptr = name_copy.get();
78  }
79
80  JvmtiUniquePtr<char[]> signature_copy;
81  if (signature_ptr != nullptr) {
82    const char* sig = art_field->GetTypeDescriptor();
83    jvmtiError ret;
84    signature_copy = CopyString(env, sig, &ret);
85    if (signature_copy == nullptr) {
86      return ret;
87    }
88    *signature_ptr = signature_copy.get();
89  }
90
91  if (generic_ptr != nullptr) {
92    *generic_ptr = nullptr;
93    if (!art_field->GetDeclaringClass()->IsProxyClass()) {
94      art::mirror::ObjectArray<art::mirror::String>* str_array =
95          art::annotations::GetSignatureAnnotationForField(art_field);
96      if (str_array != nullptr) {
97        std::ostringstream oss;
98        for (int32_t i = 0; i != str_array->GetLength(); ++i) {
99          oss << str_array->Get(i)->ToModifiedUtf8();
100        }
101        std::string output_string = oss.str();
102        jvmtiError ret;
103        JvmtiUniquePtr<char[]> copy = CopyString(env, output_string.c_str(), &ret);
104        if (copy == nullptr) {
105          return ret;
106        }
107        *generic_ptr = copy.release();
108      } else if (soa.Self()->IsExceptionPending()) {
109        // TODO: Should we report an error here?
110        soa.Self()->ClearException();
111      }
112    }
113  }
114
115  // Everything is fine, release the buffers.
116  name_copy.release();
117  signature_copy.release();
118
119  return ERR(NONE);
120}
121
122jvmtiError FieldUtil::GetFieldDeclaringClass(jvmtiEnv* env ATTRIBUTE_UNUSED,
123                                             jclass klass,
124                                             jfieldID field,
125                                             jclass* declaring_class_ptr) {
126  if (klass == nullptr) {
127    return ERR(INVALID_CLASS);
128  }
129  if (field == nullptr) {
130    return ERR(INVALID_FIELDID);
131  }
132  if (declaring_class_ptr == nullptr) {
133    return ERR(NULL_POINTER);
134  }
135
136  art::ScopedObjectAccess soa(art::Thread::Current());
137  art::ArtField* art_field = art::jni::DecodeArtField(field);
138  art::ObjPtr<art::mirror::Class> field_klass = art_field->GetDeclaringClass();
139
140  *declaring_class_ptr = soa.AddLocalReference<jclass>(field_klass);
141
142  return ERR(NONE);
143}
144
145jvmtiError FieldUtil::GetFieldModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED,
146                                        jclass klass,
147                                        jfieldID field,
148                                        jint* modifiers_ptr) {
149  if (klass == nullptr) {
150    return ERR(INVALID_CLASS);
151  }
152  if (field == nullptr) {
153    return ERR(INVALID_FIELDID);
154  }
155  if (modifiers_ptr == nullptr) {
156    return ERR(NULL_POINTER);
157  }
158
159  art::ScopedObjectAccess soa(art::Thread::Current());
160  art::ArtField* art_field = art::jni::DecodeArtField(field);
161  // Note: Keep this code in sync with Field.getModifiers.
162  uint32_t modifiers = art_field->GetAccessFlags() & 0xFFFF;
163
164  *modifiers_ptr = modifiers;
165  return ERR(NONE);
166}
167
168jvmtiError FieldUtil::IsFieldSynthetic(jvmtiEnv* env ATTRIBUTE_UNUSED,
169                                       jclass klass,
170                                       jfieldID field,
171                                       jboolean* is_synthetic_ptr) {
172  if (klass == nullptr) {
173    return ERR(INVALID_CLASS);
174  }
175  if (field == nullptr) {
176    return ERR(INVALID_FIELDID);
177  }
178  if (is_synthetic_ptr == nullptr) {
179    return ERR(NULL_POINTER);
180  }
181
182  art::ScopedObjectAccess soa(art::Thread::Current());
183  art::ArtField* art_field = art::jni::DecodeArtField(field);
184  uint32_t modifiers = art_field->GetAccessFlags();
185
186  *is_synthetic_ptr = ((modifiers & art::kAccSynthetic) != 0) ? JNI_TRUE : JNI_FALSE;
187  return ERR(NONE);
188}
189
190}  // namespace openjdkjvmti
191