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$1;", "run", "()V"},
55 {"Ljdk/internal/vm/Continuation;", "enter0", "()V"},
56 {"Ljdk/internal/vm/Continuation;", "enter", "(Ljdk/internal/vm/Continuation;Z)V"},
57 };
58
59
60 void JNICALL
61 Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *jni, jthread thread, jmethodID method, jlocation location) {
62 jint frame_count = 0;
63
64 if (mid != method) {
65 jni->FatalError("ERROR: didn't know where we got called from");
66 }
67
68 LOG(">>> (bp) checking frame count ...\n");
69
70 check_jvmti_status(jni, jvmti_env->GetFrameCount(thread, &frame_count), "GetFrameCount failed.");
71 int expected_number_of_stack_frames = jni->IsVirtualThread(thread)
72 ? ((int) (sizeof(expected_virtual_frames) / sizeof(frame_info)))
73 : ((int) (sizeof(expected_platform_frames) / sizeof(frame_info)));
74 if (frame_count != expected_number_of_stack_frames + 1) {
75 LOG("(bp) wrong frame count, expected: %d, actual: %d\n", expected_number_of_stack_frames + 1, frame_count);
76 jni->FatalError("Wrong number of frames.");
77 }
78
79 LOG(">>> (bp) frame_count: %d\n", frame_count);
80
81 set_event_notification_mode(jvmti_env, JVMTI_ENABLE, JVMTI_EVENT_SINGLE_STEP, thread);
82 LOG(">>> stepping ...\n");
83 }
84
85
86 void JNICALL
87 SingleStep(jvmtiEnv *jvmti_env, JNIEnv *jni, jthread thread, jmethodID method, jlocation location) {
88 set_event_notification_mode(jvmti, jni, JVMTI_DISABLE, JVMTI_EVENT_SINGLE_STEP, thread);
89 frame_info *expected_frames = jni->IsVirtualThread(thread)
90 ? expected_virtual_frames
91 : expected_platform_frames;
92 int expected_number_of_stack_frames = jni->IsVirtualThread(thread)
93 ? ((int) (sizeof(expected_virtual_frames) / sizeof(frame_info)))
94 : ((int) (sizeof(expected_platform_frames) / sizeof(frame_info)));
95
96 if (!compare_stack_trace(jvmti_env, jni, thread, expected_frames, expected_number_of_stack_frames)) {
97 jni->ThrowNew(jni->FindClass("java/lang/RuntimeException"), "Stacktrace differs from expected.");
98 }
99 }
100
101 JNIEXPORT jint JNICALL
102 Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
103 jvmtiError err;
104 jint res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
105 if (res != JNI_OK || jvmti == NULL) {
106 LOG("Wrong result of a valid call to GetEnv!\n");
107 return JNI_ERR;
108 }
109
110 jvmtiCapabilities caps;
111 memset(&caps, 0, sizeof(caps));
112 caps.can_generate_breakpoint_events = 1;
113 caps.can_generate_single_step_events = 1;
114
115 err = jvmti->AddCapabilities(&caps);
116 if (err != JVMTI_ERROR_NONE) {
117 LOG("(AddCapabilities) unexpected error: %s (%d)\n", TranslateError(err), err);
118 return JNI_ERR;
119 }
120
121 callbacks.Breakpoint = &Breakpoint;
122 callbacks.SingleStep = &SingleStep;
123 err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
124 if (err != JVMTI_ERROR_NONE) {
125 LOG("(SetEventCallbacks) unexpected error: %s (%d)\n", TranslateError(err), err);
126 return JNI_ERR;
127 }
128
129 return JNI_OK;
130 }
131
132 JNIEXPORT void JNICALL
133 Java_getstacktr05_getReady(JNIEnv *jni, jclass cls, jclass clazz) {
134 mid = jni->GetMethodID(clazz, "checkPoint", "()V");
135 if (mid == NULL) {
136 jni->FatalError("Cannot find Method ID for method checkPoint\n");
137 }
138 check_jvmti_status(jni, jvmti->SetBreakpoint(mid, 0), "SetBreakpoint failed.");
139 set_event_notification_mode(jvmti, jni, JVMTI_ENABLE,JVMTI_EVENT_BREAKPOINT, NULL);
140 }
141
142 }