1 /*
2  * Copyright (C) 2022 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 "android-base/macros.h"
18 #include "jni.h"
19 #include "jvmti.h"
20 #include "jvmti_helper.h"
21 #include "test_env.h"
22 
23 namespace art {
24 namespace Test2243SingleStepDefault {
25 
26 jmethodID interface_default_method;
27 
singleStepCB(jvmtiEnv * jvmti,JNIEnv * env,jthread thr,jmethodID method,jlocation location)28 static void singleStepCB(jvmtiEnv* jvmti,
29                          JNIEnv* env,
30                          jthread thr,
31                          jmethodID method,
32                          [[maybe_unused]] jlocation location) {
33   // We haven't reached the default method yet. Continue single stepping
34   if (method != interface_default_method) {
35     return;
36   }
37 
38   // Disable single stepping
39   jvmtiError err = jvmti_env->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_SINGLE_STEP, thr);
40   if (JvmtiErrorToException(env, jvmti_env, err)) {
41     return;
42   }
43 
44   // Inspect the frame.
45   jint frame_count;
46   if (JvmtiErrorToException(env, jvmti_env, jvmti_env->GetFrameCount(thr, &frame_count))) {
47     return;
48   }
49   CHECK_GT(frame_count, 0);
50 
51   // Check that the method id from the stack frame is same as the one returned
52   // by single step callback
53   jmethodID m = nullptr;
54   jlong loc = -1;
55   if (JvmtiErrorToException(env, jvmti_env, jvmti_env->GetFrameLocation(thr, 0, &m, &loc))) {
56     return;
57   }
58   CHECK_EQ(m, method) << "Method id from stack walk doesn't match id from single step callback";
59 
60   // Check that the method id is also present in the declaring class
61   jclass klass = nullptr;
62   if (JvmtiErrorToException(env, jvmti_env, jvmti_env->GetMethodDeclaringClass(m, &klass))) {
63     return;
64   }
65   jint count = 0;
66   jmethodID* methods = nullptr;
67   jvmtiError result = jvmti_env->GetClassMethods(klass, &count, &methods);
68   if (JvmtiErrorToException(env, jvmti_env, result)) {
69     return;
70   }
71 
72   bool found_method_id = false;
73   for (int i = 0; i < count; i++) {
74     if (methods[i] == method) {
75       found_method_id = true;
76       break;
77     }
78   }
79   CHECK(found_method_id) << "Couldn't find the method id in the declaring class";
80 
81   // Check it isn't copied method.
82   jint access_flags = 0;
83   if (JvmtiErrorToException(env, jvmti, jvmti->GetMethodModifiers(m, &access_flags))) {
84     return;
85   }
86   static constexpr uint32_t kAccCopied = 0x01000000;
87   static constexpr uint32_t kAccIntrinsic = 0x80000000;
88   bool is_copied = ((access_flags & (kAccIntrinsic | kAccCopied)) == kAccCopied);
89   CHECK(!is_copied) << "Got copied methodID. Missed canonicalizing?\n";
90 }
91 
Java_art_Test2243_setSingleStepCallback(JNIEnv * env)92 extern "C" JNIEXPORT void JNICALL Java_art_Test2243_setSingleStepCallback(JNIEnv* env) {
93   jvmtiEventCallbacks callbacks;
94   memset(&callbacks, 0, sizeof(jvmtiEventCallbacks));
95   callbacks.SingleStep = singleStepCB;
96 
97   jvmtiError ret = jvmti_env->SetEventCallbacks(&callbacks, sizeof(callbacks));
98   JvmtiErrorToException(env, jvmti_env, ret);
99 }
100 
Java_art_Test2243_enableSingleStep(JNIEnv * env,jclass cl,jthread thr)101 extern "C" JNIEXPORT void JNICALL Java_art_Test2243_enableSingleStep(JNIEnv* env,
102                                                                      [[maybe_unused]] jclass cl,
103                                                                      jthread thr) {
104   jvmtiError err = jvmti_env->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_SINGLE_STEP, thr);
105   JvmtiErrorToException(env, jvmti_env, err);
106 }
107 
Java_art_Test2243_setSingleStepUntil(JNIEnv * env,jclass cl,jobject method)108 extern "C" JNIEXPORT void JNICALL Java_art_Test2243_setSingleStepUntil(JNIEnv* env,
109                                                                        [[maybe_unused]] jclass cl,
110                                                                        jobject method) {
111   interface_default_method = env->FromReflectedMethod(method);
112 }
113 
114 }  // namespace Test2243SingleStepDefault
115 }  // namespace art
116