jni_env_ext.cc revision 68d8b42ddec39ec0174162d90d4abaa004d1983e 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "jni_env_ext.h"
18
19#include "check_jni.h"
20#include "indirect_reference_table.h"
21#include "java_vm_ext.h"
22#include "jni_internal.h"
23
24namespace art {
25
26static constexpr size_t kMonitorsInitial = 32;  // Arbitrary.
27static constexpr size_t kMonitorsMax = 4096;  // Arbitrary sanity check.
28
29static constexpr size_t kLocalsInitial = 64;  // Arbitrary.
30
31JNIEnvExt::JNIEnvExt(Thread* self, JavaVMExt* vm)
32    : self(self),
33      vm(vm),
34      local_ref_cookie(IRT_FIRST_SEGMENT),
35      locals(kLocalsInitial, kLocalsMax, kLocal),
36      check_jni(false),
37      critical(0),
38      monitors("monitors", kMonitorsInitial, kMonitorsMax) {
39  functions = unchecked_functions = GetJniNativeInterface();
40  if (vm->IsCheckJniEnabled()) {
41    SetCheckJniEnabled(true);
42  }
43}
44
45JNIEnvExt::~JNIEnvExt() {
46}
47
48jobject JNIEnvExt::NewLocalRef(mirror::Object* obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
49  if (obj == nullptr) {
50    return nullptr;
51  }
52  return reinterpret_cast<jobject>(locals.Add(local_ref_cookie, obj));
53}
54
55void JNIEnvExt::DeleteLocalRef(jobject obj) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
56  if (obj != nullptr) {
57    locals.Remove(local_ref_cookie, reinterpret_cast<IndirectRef>(obj));
58  }
59}
60
61void JNIEnvExt::SetCheckJniEnabled(bool enabled) {
62  check_jni = enabled;
63  functions = enabled ? GetCheckJniNativeInterface() : GetJniNativeInterface();
64}
65
66void JNIEnvExt::DumpReferenceTables(std::ostream& os) {
67  locals.Dump(os);
68  monitors.Dump(os);
69}
70
71void JNIEnvExt::PushFrame(int capacity) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
72  UNUSED(capacity);  // cpplint gets confused with (int) and thinks its a cast.
73  // TODO: take 'capacity' into account.
74  stacked_local_ref_cookies.push_back(local_ref_cookie);
75  local_ref_cookie = locals.GetSegmentState();
76}
77
78void JNIEnvExt::PopFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
79  locals.SetSegmentState(local_ref_cookie);
80  local_ref_cookie = stacked_local_ref_cookies.back();
81  stacked_local_ref_cookies.pop_back();
82}
83
84Offset JNIEnvExt::SegmentStateOffset() {
85  return Offset(OFFSETOF_MEMBER(JNIEnvExt, locals) +
86                IndirectReferenceTable::SegmentStateOffset().Int32Value());
87}
88
89}  // namespace art
90