/*
* Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdio.h>
#include <string.h>
#include "jvmti.h"
#include "agent_common.h"
#include "JVMTITools.h"
extern "C" {
#define PASSED 0
#define STATUS_FAILED 2
#define INV_SLOT (-1)
static jvmtiEnv *jvmti = NULL;
static jvmtiCapabilities caps;
static jvmtiEventCallbacks callbacks;
static jint result = PASSED;
static jboolean printdump = JNI_FALSE;
void JNICALL Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *env,
jthread thr, jmethodID method, jlocation location) {
jvmtiError err;
jmethodID mid;
jlocation loc;
jint entryCount;
jvmtiLocalVariableEntry *table;
int i;
err = jvmti_env->GetFrameLocation(thr, 1, &mid, &loc);
if (err != JVMTI_ERROR_NONE) {
printf("(GetFrameLocation) unexpected error: %s (%d)\n",
TranslateError(err), err);
result = STATUS_FAILED;
return;
}
if (printdump == JNI_TRUE) {
printf(">>> obtaining local variables mapping ...\n");
}
err = jvmti_env->GetLocalVariableTable(mid, &entryCount, &table);
if (err != JVMTI_ERROR_NONE) {
printf("(GetLocalVariableTable) unexpected error: %s (%d)\n",
TranslateError(err), err);
return;
}
if (printdump == JNI_TRUE) {
printf(">>> checking on type mismatch ...\n");
}
for (i = 0; i < entryCount; i++) {
if (strlen(table[i].name) != 1) continue;
if (strcmp(table[i].name, "o") != 0) {
err = jvmti_env->SetLocalObject(thr, 1,
table[i].slot, (jobject)thr);
if (err != JVMTI_ERROR_TYPE_MISMATCH) {
printf("\"%s\" against SetLocalObject:\n", table[i].name);
printf(" expected: JVMTI_ERROR_TYPE_MISMATCH,");
printf(" actual: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
}
if (strcmp(table[i].name, "i") != 0) {
err = jvmti_env->SetLocalInt(thr, 1,
table[i].slot, (jint)0);
if (err != JVMTI_ERROR_TYPE_MISMATCH) {
printf("\"%s\" against SetLocalInt:\n", table[i].name);
printf(" expected: JVMTI_ERROR_TYPE_MISMATCH,");
printf(" actual: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
}
if (strcmp(table[i].name, "l") != 0) {
err = jvmti_env->SetLocalLong(thr, 1,
table[i].slot, (jlong)0);
if (err != JVMTI_ERROR_TYPE_MISMATCH) {
printf("\"%s\" against SetLocalLong:\n", table[i].name);
printf(" expected: JVMTI_ERROR_TYPE_MISMATCH,");
printf(" actual: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
}
if (strcmp(table[i].name, "f") != 0) {
err = jvmti_env->SetLocalFloat(thr, 1,
table[i].slot, (jfloat)0);
if (err != JVMTI_ERROR_TYPE_MISMATCH) {
printf("\"%s\" against SetLocalFloat:\n", table[i].name);
printf(" expected: JVMTI_ERROR_TYPE_MISMATCH,");
printf(" actual: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
}
if (strcmp(table[i].name, "d") != 0) {
err = jvmti_env->SetLocalDouble(thr, 1,
table[i].slot, (jdouble)0);
if (err != JVMTI_ERROR_TYPE_MISMATCH) {
printf("\"%s\" against SetLocalDouble:\n", table[i].name);
printf(" expected: JVMTI_ERROR_TYPE_MISMATCH,");
printf(" actual: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
}
}
if (printdump == JNI_TRUE) {
printf(">>> ... done\n");
}
}
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_setlocal004(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_setlocal004(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_setlocal004(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jvmtiError err;
jint res;
if (options != NULL && strcmp(options, "printdump") == 0) {
printdump = JNI_TRUE;
}
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == NULL) {
printf("Wrong result of a valid call to GetEnv!\n");
return JNI_ERR;
}
err = jvmti->GetPotentialCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
err = jvmti->AddCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
printf("(AddCapabilities) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
err = jvmti->GetCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
printf("(GetCapabilities) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
if (!caps.can_access_local_variables) {
printf("Warning: access to local variables is not implemented\n");
} else if (caps.can_generate_breakpoint_events) {
callbacks.Breakpoint = &Breakpoint;
err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
if (err != JVMTI_ERROR_NONE) {
printf("(SetEventCallbacks) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
} else {
printf("Warning: Breakpoint event is not implemented\n");
}
return JNI_OK;
}
JNIEXPORT void JNICALL
Java_nsk_jvmti_SetLocalVariable_setlocal004_getReady(JNIEnv *env, jclass cls) {
jvmtiError err;
jmethodID mid;
if (jvmti == NULL) {
printf("JVMTI client was not properly loaded!\n");
result = STATUS_FAILED;
return;
}
if (!caps.can_access_local_variables ||
!caps.can_generate_breakpoint_events) return;
mid = env->GetStaticMethodID(cls, "checkPoint", "()V");
if (mid == 0) {
printf("Cannot find Method ID for method checkPoint\n");
result = STATUS_FAILED;
return;
}
err = jvmti->SetBreakpoint(mid, 0);
if (err != JVMTI_ERROR_NONE) {
printf("Failed to SetBreakpoint: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
return;
}
err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
JVMTI_EVENT_BREAKPOINT, NULL);
if (err != JVMTI_ERROR_NONE) {
printf("Failed to enable BREAKPOINT event: %s (%d)\n",
TranslateError(err), err);
result = STATUS_FAILED;
}
}
JNIEXPORT jint JNICALL
Java_nsk_jvmti_SetLocalVariable_setlocal004_getRes(JNIEnv *env, jclass cls) {
return result;
}
}