1 /*
2 * Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include <stdio.h>
25 #include <string.h>
26 #include "jvmti.h"
27 #include "jvmti_common.h"
28 #include "../get_stack_trace.h"
29
30 extern "C" {
31
32 static jvmtiEnv *jvmti = NULL;
33 static jvmtiCapabilities caps;
34 static jvmtiEventCallbacks callbacks;
35 static jmethodID mid;
36 static frame_info expected_platform_frames[] = {
37 {"Lgetstacktr05$TestThread;", "chain4", "()V"},
38 {"Lgetstacktr05$TestThread;", "chain3", "()V"},
39 {"Lgetstacktr05$TestThread;", "chain2", "()V"},
40 {"Lgetstacktr05$TestThread;", "chain1", "()V"},
41 {"Lgetstacktr05$TestThread;", "run", "()V"},
42 {"Ljava/lang/Thread;", "runWith", "(Ljava/lang/Object;Ljava/lang/Runnable;)V"},
43 {"Ljava/lang/Thread;", "run", "()V"},
44 };
45
46 static frame_info expected_virtual_frames[] = {
47 {"Lgetstacktr05$TestThread;", "chain4", "()V"},
48 {"Lgetstacktr05$TestThread;", "chain3", "()V"},
49 {"Lgetstacktr05$TestThread;", "chain2", "()V"},
50 {"Lgetstacktr05$TestThread;", "chain1", "()V"},
51 {"Lgetstacktr05$TestThread;", "run", "()V"},
52 {"Ljava/lang/VirtualThread;", "runWith", "(Ljava/lang/Object;Ljava/lang/Runnable;)V"},
53 {"Ljava/lang/VirtualThread;", "run", "(Ljava/lang/Runnable;)V"},
54 {"Ljava/lang/VirtualThread$VThreadContinuation;", "lambda$new$0", "(Ljava/lang/VirtualThread;Ljava/lang/Runnable;)V"},
55 {"Ljava/lang/VirtualThread$VThreadContinuation$$Lambda;", "run", "()V"},
56 {"Ljdk/internal/vm/Continuation;", "enter0", "()V"},
57 {"Ljdk/internal/vm/Continuation;", "enter", "(Ljdk/internal/vm/Continuation;Z)V"},
58 };
59
60
61 void JNICALL
62 Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *jni, jthread thread, jmethodID method, jlocation location) {
63 jint frame_count = 0;
64
65 if (mid != method) {
66 jni->FatalError("ERROR: didn't know where we got called from");
67 }
68
69 LOG(">>> (bp) checking frame count ...\n");
70
71 check_jvmti_status(jni, jvmti_env->GetFrameCount(thread, &frame_count), "GetFrameCount failed.");
72 int expected_number_of_stack_frames = jni->IsVirtualThread(thread)
73 ? ((int) (sizeof(expected_virtual_frames) / sizeof(frame_info)))
74 : ((int) (sizeof(expected_platform_frames) / sizeof(frame_info)));
75 if (frame_count != expected_number_of_stack_frames + 1) {
76 LOG("(bp) wrong frame count, expected: %d, actual: %d\n", expected_number_of_stack_frames + 1, frame_count);
77 jni->FatalError("Wrong number of frames.");
78 }
79
80 LOG(">>> (bp) frame_count: %d\n", frame_count);
81
82 set_event_notification_mode(jvmti_env, JVMTI_ENABLE, JVMTI_EVENT_SINGLE_STEP, thread);
83 LOG(">>> stepping ...\n");
84 }
85
86
87 void JNICALL
88 SingleStep(jvmtiEnv *jvmti_env, JNIEnv *jni, jthread thread, jmethodID method, jlocation location) {
89 set_event_notification_mode(jvmti, jni, JVMTI_DISABLE, JVMTI_EVENT_SINGLE_STEP, thread);
90 frame_info *expected_frames = jni->IsVirtualThread(thread)
91 ? expected_virtual_frames
92 : expected_platform_frames;
93 int expected_number_of_stack_frames = jni->IsVirtualThread(thread)
94 ? ((int) (sizeof(expected_virtual_frames) / sizeof(frame_info)))
95 : ((int) (sizeof(expected_platform_frames) / sizeof(frame_info)));
96
97 if (!compare_stack_trace(jvmti_env, jni, thread, expected_frames, expected_number_of_stack_frames)) {
98 jni->ThrowNew(jni->FindClass("java/lang/RuntimeException"), "Stacktrace differs from expected.");
99 }
100 }
101
102 JNIEXPORT jint JNICALL
103 Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
104 jvmtiError err;
105 jint res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
106 if (res != JNI_OK || jvmti == NULL) {
107 LOG("Wrong result of a valid call to GetEnv!\n");
108 return JNI_ERR;
109 }
110
111 jvmtiCapabilities caps;
112 memset(&caps, 0, sizeof(caps));
113 caps.can_generate_breakpoint_events = 1;
114 caps.can_generate_single_step_events = 1;
115
116 err = jvmti->AddCapabilities(&caps);
117 if (err != JVMTI_ERROR_NONE) {
118 LOG("(AddCapabilities) unexpected error: %s (%d)\n", TranslateError(err), err);
119 return JNI_ERR;
120 }
121
122 callbacks.Breakpoint = &Breakpoint;
123 callbacks.SingleStep = &SingleStep;
124 err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
125 if (err != JVMTI_ERROR_NONE) {
126 LOG("(SetEventCallbacks) unexpected error: %s (%d)\n", TranslateError(err), err);
127 return JNI_ERR;
128 }
129
130 return JNI_OK;
131 }
132
133 JNIEXPORT void JNICALL
134 Java_getstacktr05_getReady(JNIEnv *jni, jclass cls, jclass clazz) {
135 mid = jni->GetMethodID(clazz, "checkPoint", "()V");
136 if (mid == NULL) {
137 jni->FatalError("Cannot find Method ID for method checkPoint\n");
138 }
139 check_jvmti_status(jni, jvmti->SetBreakpoint(mid, 0), "SetBreakpoint failed.");
140 set_event_notification_mode(jvmti, jni, JVMTI_ENABLE,JVMTI_EVENT_BREAKPOINT, NULL);
141 }
142
143 }