1 /*

     2  * Copyright (c) 2003, 2018, 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 <inttypes.h>

    25 #include <stdio.h>

    26 #include <string.h>

    27 #include "jvmti.h"

    28 #include "agent_common.h"

    29 #include "jni_tools.h"

    30 #include "JVMTITools.h"

    31 

    32 #ifdef __cplusplus

    33 extern "C" {

    34 #endif

    35 

    36 #ifndef JNI_ENV_ARG

    37 

    38 #ifdef __cplusplus

    39 #define JNI_ENV_ARG(x, y) y

    40 #define JNI_ENV_PTR(x) x

    41 #else

    42 #define JNI_ENV_ARG(x,y) x, y

    43 #define JNI_ENV_PTR(x) (*x)

    44 #endif

    45 

    46 #endif

    47 

    48 #define PASSED 0

    49 #define STATUS_FAILED 2

    50 

    51 typedef struct {

    52     char *name;

    53     char *sig;

    54     jlocation loc;

    55 } entry_info;

    56 

    57 static jvmtiEnv *jvmti = NULL;

    58 static jvmtiCapabilities caps;

    59 static jvmtiEventCallbacks callbacks;

    60 static jint result = PASSED;

    61 static jboolean printdump = JNI_FALSE;

    62 static size_t eventsExpected = 0;

    63 static size_t eventsCount = 0;

    64 static entry_info entries[] = {

    65     {"check", "()I", -1},

    66     {"dummy", "()V", 0},

    67     {"chain", "()V", -1}

    68 };

    69 

    70 void JNICALL MethodEntry(jvmtiEnv *jvmti_env, JNIEnv *env,

    71         jthread thr, jmethodID method) {

    72     jvmtiError err;

    73     char *cls_sig, *generic;

    74     entry_info entry;

    75     jclass cls;

    76     jmethodID mid;

    77     char buffer[32];

    78 

    79     err = (*jvmti_env)->GetMethodDeclaringClass(jvmti_env, method, &cls);

    80     if (err != JVMTI_ERROR_NONE) {

    81         printf("(GetMethodDeclaringClass) unexpected error: %s (%d)\n",

    82                TranslateError(err), err);

    83         result = STATUS_FAILED;

    84     }

    85     err = (*jvmti_env)->GetClassSignature(jvmti_env, cls, &cls_sig, &generic);

    86     if (err != JVMTI_ERROR_NONE) {

    87         printf("(GetClassSignature) unexpected error: %s (%d)\n",

    88                TranslateError(err), err);

    89         result = STATUS_FAILED;

    90     }

    91     if (cls_sig != NULL &&

    92             strcmp(cls_sig, "Lnsk/jvmti/MethodEntry/mentry001;") == 0) {

    93         if (printdump == JNI_TRUE) {

    94             printf(">>> retrieving method entry info ...\n");

    95         }

    96         err = (*jvmti_env)->GetMethodName(jvmti_env, method,

    97             &entry.name, &entry.sig, &generic);

    98         if (err != JVMTI_ERROR_NONE) {

    99             printf("(GetMethodName) unexpected error: %s (%d)\n",

   100                    TranslateError(err), err);

   101             result = STATUS_FAILED;

   102         }

   103         err = (*jvmti_env)->GetFrameLocation(jvmti_env, thr, 0, &mid, &entry.loc);

   104         if (err != JVMTI_ERROR_NONE) {

   105             printf("(GetFrameLocation) unexpected error: %s (%d)\n",

   106                    TranslateError(err), err);

   107             result = STATUS_FAILED;

   108         }

   109         if (printdump == JNI_TRUE) {

   110             printf(">>>      class: \"%s\"\n", cls_sig);

   111             printf(">>>     method: \"%s%s\"\n", entry.name, entry.sig);

   112             printf(">>>   location: %s\n", jlong_to_string(entry.loc, buffer));

   113             printf(">>> ... done\n");

   114         }

   115         if (eventsCount < sizeof(entries)/sizeof(entry_info)) {

   116             if (entry.name == NULL ||

   117                     strcmp(entry.name, entries[eventsCount].name) != 0) {

   118                 printf("(entry#%" PRIuPTR ") wrong method name: \"%s\"",

   119                        eventsCount, entry.name);

   120                 printf(", expected: \"%s\"\n", entries[eventsCount].name);

   121                 result = STATUS_FAILED;

   122             }

   123             if (entry.sig == NULL ||

   124                     strcmp(entry.sig, entries[eventsCount].sig) != 0) {

   125                 printf("(entry#%" PRIuPTR ") wrong method sig: \"%s\"",

   126                        eventsCount, entry.sig);

   127                 printf(", expected: \"%s\"\n", entries[eventsCount].sig);

   128                 result = STATUS_FAILED;

   129             }

   130             if (entry.loc != entries[eventsCount].loc) {

   131                 printf("(entry#%" PRIuPTR ") wrong location: %s",

   132                        eventsCount, jlong_to_string(entry.loc, buffer));

   133                 printf(", expected: %s\n",

   134                        jlong_to_string(entries[eventsCount].loc, buffer));

   135                 result = STATUS_FAILED;

   136             }

   137         } else {

   138             printf("Unexpected method entry catched:");

   139             printf("     class: \"%s\"\n", cls_sig);

   140             printf("    method: \"%s%s\"\n", entry.name, entry.sig);

   141             printf("  location: %s\n", jlong_to_string(entry.loc, buffer));

   142             result = STATUS_FAILED;

   143         }

   144         eventsCount++;

   145     }

   146 }

   147 

   148 #ifdef STATIC_BUILD

   149 JNIEXPORT jint JNICALL Agent_OnLoad_mentry001(JavaVM *jvm, char *options, void *reserved) {

   150     return Agent_Initialize(jvm, options, reserved);

   151 }

   152 JNIEXPORT jint JNICALL Agent_OnAttach_mentry001(JavaVM *jvm, char *options, void *reserved) {

   153     return Agent_Initialize(jvm, options, reserved);

   154 }

   155 JNIEXPORT jint JNI_OnLoad_mentry001(JavaVM *jvm, char *options, void *reserved) {

   156     return JNI_VERSION_1_8;

   157 }

   158 #endif

   159 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {

   160     jvmtiError err;

   161     jint res;

   162 

   163     if (options != NULL && strcmp(options, "printdump") == 0) {

   164         printdump = JNI_TRUE;

   165     }

   166 

   167     res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),

   168         JVMTI_VERSION_1_1);

   169     if (res != JNI_OK || jvmti == NULL) {

   170         printf("Wrong result of a valid call to GetEnv!\n");

   171         return JNI_ERR;

   172     }

   173 

   174     err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps);

   175     if (err != JVMTI_ERROR_NONE) {

   176         printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",

   177                TranslateError(err), err);

   178         return JNI_ERR;

   179     }

   180 

   181     err = (*jvmti)->AddCapabilities(jvmti, &caps);

   182     if (err != JVMTI_ERROR_NONE) {

   183         printf("(AddCapabilities) unexpected error: %s (%d)\n",

   184                TranslateError(err), err);

   185         return JNI_ERR;

   186     }

   187 

   188     err = (*jvmti)->GetCapabilities(jvmti, &caps);

   189     if (err != JVMTI_ERROR_NONE) {

   190         printf("(GetCapabilities) unexpected error: %s (%d)\n",

   191                TranslateError(err), err);

   192         return JNI_ERR;

   193     }

   194 

   195     if (caps.can_generate_method_entry_events) {

   196         callbacks.MethodEntry = &MethodEntry;

   197         err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(callbacks));

   198         if (err != JVMTI_ERROR_NONE) {

   199             printf("(SetEventCallbacks) unexpected error: %s (%d)\n",

   200                    TranslateError(err), err);

   201             return JNI_ERR;

   202         }

   203     } else {

   204         printf("Warning: MethodEntry event is not implemented\n");

   205     }

   206 

   207     return JNI_OK;

   208 }

   209 

   210 JNIEXPORT void JNICALL

   211 Java_nsk_jvmti_MethodEntry_mentry001_enable(JNIEnv *env, jclass cls) {

   212     jvmtiError err;

   213 

   214     if (jvmti == NULL) {

   215         return;

   216     }

   217 

   218     if (!caps.can_generate_method_entry_events) {

   219         return;

   220     }

   221 

   222     err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,

   223             JVMTI_EVENT_METHOD_ENTRY, NULL);

   224     if (err == JVMTI_ERROR_NONE) {

   225         eventsExpected = sizeof(entries)/sizeof(entry_info);

   226     } else {

   227         printf("Failed to enable JVMTI_EVENT_METHOD_ENTRY event: %s (%d)\n",

   228                TranslateError(err), err);

   229         result = STATUS_FAILED;

   230     }

   231 }

   232 

   233 JNIEXPORT jint JNICALL

   234 Java_nsk_jvmti_MethodEntry_mentry001_check(JNIEnv *env, jclass cls) {

   235     jmethodID mid;

   236 

   237     mid = JNI_ENV_PTR(env)->GetStaticMethodID(JNI_ENV_ARG(env, cls),

   238         "dummy", "()V");

   239     if (mid == NULL) {

   240         printf("Cannot find metod \"dummy()\"!\n");

   241         return STATUS_FAILED;

   242     }

   243 

   244     JNI_ENV_PTR(env)->CallStaticVoidMethod(JNI_ENV_ARG(env, cls), mid);

   245     if (eventsCount != eventsExpected) {

   246         printf("Wrong number of MethodEntry events: %" PRIuPTR ", expected: %" PRIuPTR "\n",

   247             eventsCount, eventsExpected);

   248         result = STATUS_FAILED;

   249     }

   250     return result;

   251 }

   252 

   253 JNIEXPORT void JNICALL

   254 Java_nsk_jvmti_MethodEntry_mentry001_chain(JNIEnv *env, jclass cls) {

   255     jvmtiError err;

   256 

   257     if (jvmti == NULL) {

   258         printf("JVMTI client was not properly loaded!\n");

   259         result = STATUS_FAILED;

   260         return;

   261     }

   262 

   263     if (!caps.can_generate_method_entry_events) {

   264         return;

   265     }

   266 

   267     err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_DISABLE,

   268             JVMTI_EVENT_METHOD_ENTRY, NULL);

   269     if (err != JVMTI_ERROR_NONE) {

   270         printf("Failed to disable JVMTI_EVENT_METHOD_ENTRY event: %s (%d)\n",

   271                TranslateError(err), err);

   272         result = STATUS_FAILED;

   273     }

   274 }

   275 

   276 #ifdef __cplusplus

   277 }

   278 #endif