1/*
2 * Copyright (C) 2013 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 <assert.h>
18#include <stdio.h>
19#include <pthread.h>
20#include <vector>
21
22#include "jni.h"
23
24#if defined(NDEBUG)
25#error test code compiled without NDEBUG
26#endif
27
28static JavaVM* jvm = nullptr;
29
30extern "C" JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *) {
31  assert(vm != nullptr);
32  assert(jvm == nullptr);
33  jvm = vm;
34  return JNI_VERSION_1_6;
35}
36
37static void* AttachHelper(void* arg) {
38  assert(jvm != nullptr);
39
40  JNIEnv* env = nullptr;
41  JavaVMAttachArgs args = { JNI_VERSION_1_6, __FUNCTION__, nullptr };
42  int attach_result = jvm->AttachCurrentThread(&env, &args);
43  assert(attach_result == 0);
44
45  typedef void (*Fn)(JNIEnv*);
46  Fn fn = reinterpret_cast<Fn>(arg);
47  fn(env);
48
49  int detach_result = jvm->DetachCurrentThread();
50  assert(detach_result == 0);
51  return nullptr;
52}
53
54static void PthreadHelper(void (*fn)(JNIEnv*)) {
55  pthread_t pthread;
56  int pthread_create_result = pthread_create(&pthread, nullptr, AttachHelper,
57                                             reinterpret_cast<void*>(fn));
58  assert(pthread_create_result == 0);
59  int pthread_join_result = pthread_join(pthread, nullptr);
60  assert(pthread_join_result == 0);
61}
62
63static void testFindClassOnAttachedNativeThread(JNIEnv* env) {
64  jclass clazz = env->FindClass("Main");
65  assert(clazz != nullptr);
66  assert(!env->ExceptionCheck());
67
68  jobjectArray array = env->NewObjectArray(0, clazz, nullptr);
69  assert(array != nullptr);
70  assert(!env->ExceptionCheck());
71}
72
73// http://b/10994325
74extern "C" JNIEXPORT void JNICALL Java_Main_testFindClassOnAttachedNativeThread(JNIEnv*, jclass) {
75  PthreadHelper(&testFindClassOnAttachedNativeThread);
76}
77
78static void testFindFieldOnAttachedNativeThread(JNIEnv* env) {
79  jclass clazz = env->FindClass("Main");
80  assert(clazz != nullptr);
81  assert(!env->ExceptionCheck());
82
83  jfieldID field = env->GetStaticFieldID(clazz, "testFindFieldOnAttachedNativeThreadField", "Z");
84  assert(field != nullptr);
85  assert(!env->ExceptionCheck());
86
87  env->SetStaticBooleanField(clazz, field, JNI_TRUE);
88}
89
90extern "C" JNIEXPORT void JNICALL Java_Main_testFindFieldOnAttachedNativeThreadNative(JNIEnv*,
91                                                                                      jclass) {
92  PthreadHelper(&testFindFieldOnAttachedNativeThread);
93}
94
95static void testReflectFieldGetFromAttachedNativeThread(JNIEnv* env) {
96  jclass clazz = env->FindClass("Main");
97  assert(clazz != nullptr);
98  assert(!env->ExceptionCheck());
99
100  jclass class_clazz = env->FindClass("java/lang/Class");
101  assert(class_clazz != nullptr);
102  assert(!env->ExceptionCheck());
103
104  jmethodID getFieldMetodId = env->GetMethodID(class_clazz, "getField",
105                                               "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
106  assert(getFieldMetodId != nullptr);
107  assert(!env->ExceptionCheck());
108
109  jstring field_name = env->NewStringUTF("testReflectFieldGetFromAttachedNativeThreadField");
110  assert(field_name != nullptr);
111  assert(!env->ExceptionCheck());
112
113  jobject field = env->CallObjectMethod(clazz, getFieldMetodId, field_name);
114  assert(field != nullptr);
115  assert(!env->ExceptionCheck());
116
117  jclass field_clazz = env->FindClass("java/lang/reflect/Field");
118  assert(field_clazz != nullptr);
119  assert(!env->ExceptionCheck());
120
121  jmethodID getBooleanMetodId = env->GetMethodID(field_clazz, "getBoolean",
122                                                 "(Ljava/lang/Object;)Z");
123  assert(getBooleanMetodId != nullptr);
124  assert(!env->ExceptionCheck());
125
126  jboolean value = env->CallBooleanMethod(field, getBooleanMetodId, /* ignored */ clazz);
127  assert(value == false);
128  assert(!env->ExceptionCheck());
129}
130
131// http://b/15539150
132extern "C" JNIEXPORT void JNICALL Java_Main_testReflectFieldGetFromAttachedNativeThreadNative(
133    JNIEnv*, jclass) {
134  PthreadHelper(&testReflectFieldGetFromAttachedNativeThread);
135}
136
137
138// http://b/11243757
139extern "C" JNIEXPORT void JNICALL Java_Main_testCallStaticVoidMethodOnSubClassNative(JNIEnv* env,
140                                                                                     jclass) {
141  jclass super_class = env->FindClass("Main$testCallStaticVoidMethodOnSubClass_SuperClass");
142  assert(super_class != nullptr);
143
144  jmethodID execute = env->GetStaticMethodID(super_class, "execute", "()V");
145  assert(execute != nullptr);
146
147  jclass sub_class = env->FindClass("Main$testCallStaticVoidMethodOnSubClass_SubClass");
148  assert(sub_class != nullptr);
149
150  env->CallStaticVoidMethod(sub_class, execute);
151}
152
153extern "C" JNIEXPORT jobject JNICALL Java_Main_testGetMirandaMethodNative(JNIEnv* env, jclass) {
154  jclass abstract_class = env->FindClass("Main$testGetMirandaMethod_MirandaAbstract");
155  assert(abstract_class != nullptr);
156  jmethodID miranda_method = env->GetMethodID(abstract_class, "inInterface", "()Z");
157  assert(miranda_method != nullptr);
158  return env->ToReflectedMethod(abstract_class, miranda_method, JNI_FALSE);
159}
160
161// https://code.google.com/p/android/issues/detail?id=63055
162extern "C" void JNICALL Java_Main_testZeroLengthByteBuffers(JNIEnv* env, jclass) {
163  std::vector<uint8_t> buffer(1);
164  jobject byte_buffer = env->NewDirectByteBuffer(&buffer[0], 0);
165  assert(byte_buffer != nullptr);
166  assert(!env->ExceptionCheck());
167
168  assert(env->GetDirectBufferAddress(byte_buffer) == &buffer[0]);
169  assert(env->GetDirectBufferCapacity(byte_buffer) == 0);
170}
171
172constexpr size_t kByteReturnSize = 7;
173jbyte byte_returns[kByteReturnSize] = { 0, 1, 2, 127, -1, -2, -128 };
174
175extern "C" jbyte JNICALL Java_Main_byteMethod(JNIEnv*, jclass, jbyte b1, jbyte b2,
176                                              jbyte b3, jbyte b4, jbyte b5, jbyte b6,
177                                              jbyte b7, jbyte b8, jbyte b9, jbyte b10) {
178  // We use b1 to drive the output.
179  assert(b2 == 2);
180  assert(b3 == -3);
181  assert(b4 == 4);
182  assert(b5 == -5);
183  assert(b6 == 6);
184  assert(b7 == -7);
185  assert(b8 == 8);
186  assert(b9 == -9);
187  assert(b10 == 10);
188
189  assert(0 <= b1);
190  assert(b1 < static_cast<jbyte>(kByteReturnSize));
191
192  return byte_returns[b1];
193}
194
195constexpr size_t kShortReturnSize = 9;
196jshort short_returns[kShortReturnSize] = { 0, 1, 2, 127, 32767, -1, -2, -128,
197    static_cast<jshort>(0x8000) };
198// The weird static_cast is because short int is only guaranteed down to -32767, not Java's -32768.
199
200extern "C" jshort JNICALL Java_Main_shortMethod(JNIEnv*, jclass, jshort s1, jshort s2,
201                                                jshort s3, jshort s4, jshort s5, jshort s6,
202                                                jshort s7, jshort s8, jshort s9, jshort s10) {
203  // We use s1 to drive the output.
204  assert(s2 == 2);
205  assert(s3 == -3);
206  assert(s4 == 4);
207  assert(s5 == -5);
208  assert(s6 == 6);
209  assert(s7 == -7);
210  assert(s8 == 8);
211  assert(s9 == -9);
212  assert(s10 == 10);
213
214  assert(0 <= s1);
215  assert(s1 < static_cast<jshort>(kShortReturnSize));
216
217  return short_returns[s1];
218}
219
220extern "C" jboolean JNICALL Java_Main_booleanMethod(JNIEnv*, jclass, jboolean b1,
221                                                    jboolean b2, jboolean b3, jboolean b4,
222                                                    jboolean b5, jboolean b6, jboolean b7,
223                                                    jboolean b8, jboolean b9, jboolean b10) {
224  // We use b1 to drive the output.
225  assert(b2 == JNI_TRUE);
226  assert(b3 == JNI_FALSE);
227  assert(b4 == JNI_TRUE);
228  assert(b5 == JNI_FALSE);
229  assert(b6 == JNI_TRUE);
230  assert(b7 == JNI_FALSE);
231  assert(b8 == JNI_TRUE);
232  assert(b9 == JNI_FALSE);
233  assert(b10 == JNI_TRUE);
234
235  assert(b1 == JNI_TRUE || b1 == JNI_FALSE);
236  return b1;
237}
238
239constexpr size_t kCharReturnSize = 8;
240jchar char_returns[kCharReturnSize] = { 0, 1, 2, 127, 255, 256, 15000, 34000 };
241
242extern "C" jchar JNICALL Java_Main_charMethod(JNIEnv*, jclass, jchar c1, jchar c2,
243                                              jchar c3, jchar c4, jchar c5, jchar c6, jchar c7,
244                                              jchar c8, jchar c9, jchar c10) {
245  // We use c1 to drive the output.
246  assert(c2 == 'a');
247  assert(c3 == 'b');
248  assert(c4 == 'c');
249  assert(c5 == '0');
250  assert(c6 == '1');
251  assert(c7 == '2');
252  assert(c8 == 1234);
253  assert(c9 == 2345);
254  assert(c10 == 3456);
255
256  assert(c1 < static_cast<jchar>(kCharReturnSize));
257
258  return char_returns[c1];
259}
260
261extern "C" JNIEXPORT void JNICALL Java_Main_removeLocalObject(JNIEnv* env, jclass, jclass o) {
262  // Delete the arg to see if it crashes.
263  env->DeleteLocalRef(o);
264}
265
266extern "C" JNIEXPORT jboolean JNICALL Java_Main_nativeIsAssignableFrom(JNIEnv* env, jclass,
267                                                                       jclass from, jclass to) {
268  return env->IsAssignableFrom(from, to);
269}
270
271static void testShallowGetCallingClassLoader(JNIEnv* env) {
272  // Test direct call.
273  {
274    jclass vmstack_clazz = env->FindClass("dalvik/system/VMStack");
275    assert(vmstack_clazz != nullptr);
276    assert(!env->ExceptionCheck());
277
278    jmethodID getCallingClassLoaderMethodId = env->GetStaticMethodID(vmstack_clazz,
279                                                                     "getCallingClassLoader",
280                                                                     "()Ljava/lang/ClassLoader;");
281    assert(getCallingClassLoaderMethodId != nullptr);
282    assert(!env->ExceptionCheck());
283
284    jobject class_loader = env->CallStaticObjectMethod(vmstack_clazz,
285                                                       getCallingClassLoaderMethodId);
286    assert(class_loader == nullptr);
287    assert(!env->ExceptionCheck());
288  }
289
290  // Test one-level call. Use System.loadLibrary().
291  {
292    jclass system_clazz = env->FindClass("java/lang/System");
293    assert(system_clazz != nullptr);
294    assert(!env->ExceptionCheck());
295
296    jmethodID loadLibraryMethodId = env->GetStaticMethodID(system_clazz, "loadLibrary",
297                                                           "(Ljava/lang/String;)V");
298    assert(loadLibraryMethodId != nullptr);
299    assert(!env->ExceptionCheck());
300
301    // Create a string object.
302    jobject library_string = env->NewStringUTF("non_existing_library");
303    assert(library_string != nullptr);
304    assert(!env->ExceptionCheck());
305
306    env->CallStaticVoidMethod(system_clazz, loadLibraryMethodId, library_string);
307    assert(env->ExceptionCheck());
308
309    // We expect UnsatisfiedLinkError.
310    jthrowable thrown = env->ExceptionOccurred();
311    env->ExceptionClear();
312
313    jclass unsatisfied_link_error_clazz = env->FindClass("java/lang/UnsatisfiedLinkError");
314    jclass thrown_class = env->GetObjectClass(thrown);
315    assert(env->IsSameObject(unsatisfied_link_error_clazz, thrown_class));
316  }
317}
318
319// http://b/16867274
320extern "C" JNIEXPORT void JNICALL Java_Main_nativeTestShallowGetCallingClassLoader(JNIEnv*,
321                                                                                   jclass) {
322  PthreadHelper(&testShallowGetCallingClassLoader);
323}
324
325static void testShallowGetStackClass2(JNIEnv* env) {
326  jclass vmstack_clazz = env->FindClass("dalvik/system/VMStack");
327  assert(vmstack_clazz != nullptr);
328  assert(!env->ExceptionCheck());
329
330  // Test direct call.
331  {
332    jmethodID getStackClass2MethodId = env->GetStaticMethodID(vmstack_clazz, "getStackClass2",
333                                                              "()Ljava/lang/Class;");
334    assert(getStackClass2MethodId != nullptr);
335    assert(!env->ExceptionCheck());
336
337    jobject caller_class = env->CallStaticObjectMethod(vmstack_clazz, getStackClass2MethodId);
338    assert(caller_class == nullptr);
339    assert(!env->ExceptionCheck());
340  }
341
342  // Test one-level call. Use VMStack.getStackClass1().
343  {
344    jmethodID getStackClass1MethodId = env->GetStaticMethodID(vmstack_clazz, "getStackClass1",
345                                                              "()Ljava/lang/Class;");
346    assert(getStackClass1MethodId != nullptr);
347    assert(!env->ExceptionCheck());
348
349    jobject caller_class = env->CallStaticObjectMethod(vmstack_clazz, getStackClass1MethodId);
350    assert(caller_class == nullptr);
351    assert(!env->ExceptionCheck());
352  }
353
354  // For better testing we would need to compile against libcore and have a two-deep stack
355  // ourselves.
356}
357
358extern "C" JNIEXPORT void JNICALL Java_Main_nativeTestShallowGetStackClass2(JNIEnv*, jclass) {
359  PthreadHelper(&testShallowGetStackClass2);
360}
361
362class JniCallNonvirtualVoidMethodTest {
363 public:
364  explicit JniCallNonvirtualVoidMethodTest(JNIEnv* env)
365      : env_(env),
366        check_jni_ri_(true),
367        check_jni_android_(true),
368        super_(GetClass("JniCallNonvirtualTest")),
369        sub_(GetClass("JniCallNonvirtualTestSubclass")),
370        super_constructor_(GetMethodID(super_, true, "<init>")),
371        super_static_(GetMethodID(super_, false, "staticMethod")),
372        super_nonstatic_(GetMethodID(super_, true, "nonstaticMethod")),
373        sub_constructor_(GetMethodID(sub_, true, "<init>")),
374        sub_static_(GetMethodID(sub_, false, "staticMethod")),
375        sub_nonstatic_(GetMethodID(sub_, true, "nonstaticMethod")),
376        super_field_(GetFieldID(super_, "nonstaticMethodSuperCalled")),
377        sub_field_(GetFieldID(super_, "nonstaticMethodSubCalled")) {}
378
379  void Test() {
380    TestStaticCallNonvirtualMethod();
381    TestNewObject();
382    TestnonstaticCallNonvirtualMethod();
383  }
384
385  JNIEnv* const env_;
386
387  bool const check_jni_ri_;
388  bool const check_jni_android_;
389
390  jclass const super_;
391  jclass const sub_;
392
393  jmethodID const super_constructor_;
394  jmethodID const super_static_;
395  jmethodID const super_nonstatic_;
396  jmethodID const sub_constructor_;
397  jmethodID const sub_static_;
398  jmethodID const sub_nonstatic_;
399
400  jfieldID const super_field_;
401  jfieldID const sub_field_;
402
403 private:
404  jclass GetClass(const char* class_name) {
405    jclass c = env_->FindClass(class_name);
406    if (env_->ExceptionCheck()) {
407      env_->ExceptionDescribe();
408      env_->FatalError(__FUNCTION__);
409    }
410    assert(!env_->ExceptionCheck());
411    assert(c != nullptr);
412    return c;
413  }
414
415  jmethodID GetMethodID(jclass c, bool nonstatic, const char* method_name) {
416    jmethodID m = ((nonstatic) ?
417                   env_->GetMethodID(c, method_name, "()V") :
418                   env_->GetStaticMethodID(c, method_name, "()V"));
419    if (env_->ExceptionCheck()) {
420      env_->ExceptionDescribe();
421      env_->FatalError(__FUNCTION__);
422    }
423    assert(m != nullptr);
424    return m;
425  }
426
427  jobject CallConstructor(jclass c, jmethodID m) {
428    jobject o = env_->NewObject(c, m);
429    if (env_->ExceptionCheck()) {
430      env_->ExceptionDescribe();
431      env_->FatalError(__FUNCTION__);
432    }
433    assert(o != nullptr);
434    return o;
435  }
436
437  void CallMethod(jobject o, jclass c, jmethodID m, bool nonstatic, const char* test_case) {
438    printf("RUNNING %s\n", test_case);
439    env_->CallNonvirtualVoidMethod(o, c, m);
440    bool exception_check = env_->ExceptionCheck();
441    if (c == nullptr || !nonstatic) {
442      if (!exception_check) {
443        printf("FAILED %s due to missing exception\n", test_case);
444        env_->FatalError("Expected NullPointerException with null jclass");
445      }
446      env_->ExceptionClear();
447    } else if (exception_check) {
448      printf("FAILED %s due to pending exception\n", test_case);
449      env_->ExceptionDescribe();
450      env_->FatalError(test_case);
451    }
452    printf("PASSED %s\n", test_case);
453  }
454
455  jfieldID GetFieldID(jclass c, const char* field_name) {
456    jfieldID m = env_->GetFieldID(c, field_name, "Z");
457    if (env_->ExceptionCheck()) {
458      env_->ExceptionDescribe();
459      env_->FatalError(__FUNCTION__);
460    }
461    assert(m != nullptr);
462    return m;
463  }
464
465  jboolean GetBooleanField(jobject o, jfieldID f) {
466    jboolean b = env_->GetBooleanField(o, f);
467    if (env_->ExceptionCheck()) {
468      env_->ExceptionDescribe();
469      env_->FatalError(__FUNCTION__);
470    }
471    return b;
472  }
473
474  void TestStaticCallNonvirtualMethod() {
475    if (!check_jni_ri_&& !check_jni_android_) {
476      CallMethod(nullptr, nullptr, super_static_, false, "null object, null class, super static");
477    }
478    if (!check_jni_android_) {
479      CallMethod(nullptr, super_, super_static_, false, "null object, super class, super static");
480    }
481    if (!check_jni_android_) {
482      CallMethod(nullptr, sub_, super_static_, false, "null object, sub class, super static");
483    }
484
485    if (!check_jni_ri_ && !check_jni_android_) {
486      CallMethod(nullptr, nullptr, sub_static_, false, "null object, null class, sub static");
487    }
488    if (!check_jni_android_) {
489      CallMethod(nullptr, sub_, sub_static_, false, "null object, super class, sub static");
490    }
491    if (!check_jni_android_) {
492      CallMethod(nullptr, super_, sub_static_, false, "null object, super class, sub static");
493    }
494  }
495
496  void TestNewObject() {
497    jobject super_super = CallConstructor(super_, super_constructor_);
498    jobject super_sub = CallConstructor(super_, sub_constructor_);
499    jobject sub_super = CallConstructor(sub_, super_constructor_);
500    jobject sub_sub = CallConstructor(sub_, sub_constructor_);
501
502    assert(env_->IsInstanceOf(super_super, super_));
503    assert(!env_->IsInstanceOf(super_super, sub_));
504
505    // Note that even though we called (and ran) the subclass
506    // constructor, we are not the subclass.
507    assert(env_->IsInstanceOf(super_sub, super_));
508    assert(!env_->IsInstanceOf(super_sub, sub_));
509
510    // Note that even though we called the superclass constructor, we
511    // are still the subclass.
512    assert(env_->IsInstanceOf(sub_super, super_));
513    assert(env_->IsInstanceOf(sub_super, sub_));
514
515    assert(env_->IsInstanceOf(sub_sub, super_));
516    assert(env_->IsInstanceOf(sub_sub, sub_));
517  }
518
519  void TestnonstaticCallNonvirtualMethod(bool super_object, bool super_class, bool super_method, const char* test_case) {
520    if (check_jni_android_) {
521      if (super_object && !super_method) {
522        return;  // We don't allow a call with sub class method on the super class instance.
523      }
524      if (super_class && !super_method) {
525        return;  // We don't allow a call with the sub class method with the super class argument.
526      }
527    }
528    jobject o = ((super_object) ?
529                 CallConstructor(super_, super_constructor_) :
530                 CallConstructor(sub_, sub_constructor_));
531    jclass c = (super_class) ? super_ : sub_;
532    jmethodID m = (super_method) ? super_nonstatic_ : sub_nonstatic_;
533    CallMethod(o, c, m, true, test_case);
534    jboolean super_field = GetBooleanField(o, super_field_);
535    jboolean sub_field = GetBooleanField(o, sub_field_);
536    assert(super_field == super_method);
537    assert(sub_field != super_method);
538  }
539
540  void TestnonstaticCallNonvirtualMethod() {
541    TestnonstaticCallNonvirtualMethod(true, true, true, "super object, super class, super nonstatic");
542    TestnonstaticCallNonvirtualMethod(true, false, true, "super object, sub class, super nonstatic");
543    TestnonstaticCallNonvirtualMethod(true, false, false, "super object, sub class, sub nonstatic");
544    TestnonstaticCallNonvirtualMethod(true, true, false, "super object, super class, sub nonstatic");
545
546    TestnonstaticCallNonvirtualMethod(false, true, true, "sub object, super class, super nonstatic");
547    TestnonstaticCallNonvirtualMethod(false, false, true, "sub object, sub class, super nonstatic");
548    TestnonstaticCallNonvirtualMethod(false, false, false, "sub object, sub class, sub nonstatic");
549    TestnonstaticCallNonvirtualMethod(false, true, false, "sub object, super class, sub nonstatic");
550  }
551};
552
553extern "C" void JNICALL Java_Main_testCallNonvirtual(JNIEnv* env, jclass) {
554  JniCallNonvirtualVoidMethodTest(env).Test();
555}
556
557extern "C" JNIEXPORT void JNICALL Java_Main_testNewStringObject(JNIEnv* env, jclass) {
558  jclass c = env->FindClass("java/lang/String");
559  assert(c != nullptr);
560
561  jmethodID mid1 = env->GetMethodID(c, "<init>", "()V");
562  assert(mid1 != nullptr);
563  assert(!env->ExceptionCheck());
564  jmethodID mid2 = env->GetMethodID(c, "<init>", "([B)V");
565  assert(mid2 != nullptr);
566  assert(!env->ExceptionCheck());
567  jmethodID mid3 = env->GetMethodID(c, "<init>", "([C)V");
568  assert(mid3 != nullptr);
569  assert(!env->ExceptionCheck());
570  jmethodID mid4 = env->GetMethodID(c, "<init>", "(Ljava/lang/String;)V");
571  assert(mid4 != nullptr);
572  assert(!env->ExceptionCheck());
573
574  const char* test_array = "Test";
575  int byte_array_length = strlen(test_array);
576  jbyteArray byte_array = env->NewByteArray(byte_array_length);
577  env->SetByteArrayRegion(byte_array, 0, byte_array_length, reinterpret_cast<const jbyte*>(test_array));
578
579  // Test NewObject
580  jstring s = reinterpret_cast<jstring>(env->NewObject(c, mid2, byte_array));
581  assert(s != nullptr);
582  assert(env->GetStringLength(s) == byte_array_length);
583  assert(env->GetStringUTFLength(s) == byte_array_length);
584  const char* chars = env->GetStringUTFChars(s, nullptr);
585  assert(strcmp(test_array, chars) == 0);
586  env->ReleaseStringUTFChars(s, chars);
587
588  // Test AllocObject and Call(Nonvirtual)VoidMethod
589  jstring s1 = reinterpret_cast<jstring>(env->AllocObject(c));
590  assert(s1 != nullptr);
591  jstring s2 = reinterpret_cast<jstring>(env->AllocObject(c));
592  assert(s2 != nullptr);
593  jstring s3 = reinterpret_cast<jstring>(env->AllocObject(c));
594  assert(s3 != nullptr);
595  jstring s4 = reinterpret_cast<jstring>(env->AllocObject(c));
596  assert(s4 != nullptr);
597
598  jcharArray char_array = env->NewCharArray(5);
599  jstring string_arg = env->NewStringUTF("helloworld");
600
601  // With Var Args
602  env->CallVoidMethod(s1, mid1);
603  env->CallNonvirtualVoidMethod(s2, c, mid2, byte_array);
604
605  // With JValues
606  jvalue args3[1];
607  args3[0].l = char_array;
608  jvalue args4[1];
609  args4[0].l = string_arg;
610  env->CallVoidMethodA(s3, mid3, args3);
611  env->CallNonvirtualVoidMethodA(s4, c, mid4, args4);
612
613  // Test with global and weak global references
614  jstring s5 = reinterpret_cast<jstring>(env->AllocObject(c));
615  assert(s5 != nullptr);
616  s5 = reinterpret_cast<jstring>(env->NewGlobalRef(s5));
617  jstring s6 = reinterpret_cast<jstring>(env->AllocObject(c));
618  assert(s6 != nullptr);
619  s6 = reinterpret_cast<jstring>(env->NewWeakGlobalRef(s6));
620
621  env->CallVoidMethod(s5, mid1);
622  env->CallNonvirtualVoidMethod(s6, c, mid2, byte_array);
623  assert(env->GetStringLength(s5) == 0);
624  assert(env->GetStringLength(s6) == byte_array_length);
625  const char* chars6 = env->GetStringUTFChars(s6, nullptr);
626  assert(strcmp(test_array, chars6) == 0);
627  env->ReleaseStringUTFChars(s6, chars6);
628}
629
630extern "C" JNIEXPORT jlong JNICALL Java_Main_testGetMethodID(JNIEnv* env, jclass, jclass c) {
631  return reinterpret_cast<jlong>(env->GetMethodID(c, "a", "()V"));
632}
633