301 lines
11 KiB
C++
301 lines
11 KiB
C++
/*
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* Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <jvmti.h>
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#include "agent_common.hpp"
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#include "JVMTITools.hpp"
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extern "C" {
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#define BP_NUM 5 /* overall number of breakpoints */
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#define STATUS_FAILED 2
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#define PASSED 0
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typedef struct {
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int inst; /* type of a method: 0- static; 1- instance */
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char *m_name; /* method name */
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char *m_sign; /* JVM signature of a method */
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int loc; /* breakpoint location in a method's body */
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jmethodID mid; /* JNI's method ID */
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} breakpoint;
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/* list of breakpoints */
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static breakpoint breakpoints[] = {
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{ 1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 0, nullptr },
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{ 1, (char*) "finMethod", (char*) "(JIJ)V", 5, nullptr },
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{ 1, (char*) "finMethod", (char*) "(JIJ)V", 4, nullptr },
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{ 1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 1, nullptr },
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{ 0, (char*) "statMethod", (char*) "(III)I", 1, nullptr }
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};
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static jclass redefCls; /* JNI's Java class object */
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static jvmtiEnv *jvmti = nullptr;
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static jvmtiCapabilities caps;
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static jvmtiEventCallbacks callbacks;
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void JNICALL Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *env,
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jthread thread, jmethodID method, jlocation location) {
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}
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNICALL Agent_OnLoad_redefclass008(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL Agent_OnAttach_redefclass008(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNI_OnLoad_redefclass008(JavaVM *jvm, char *options, void *reserved) {
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return JNI_VERSION_1_8;
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}
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#endif
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jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
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jint res;
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jvmtiError err;
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res = vm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
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if (res != JNI_OK) {
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printf("%s: Failed to call GetEnv: error=%d\n", __FILE__, res);
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return JNI_ERR;
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}
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err = jvmti->GetPotentialCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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printf("(AddCapabilities) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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err = jvmti->GetCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetCapabilities) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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if (!caps.can_redefine_classes) {
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printf("Warning: RedefineClasses is not implemented\n");
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}
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if (caps.can_generate_breakpoint_events) {
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callbacks.Breakpoint = &Breakpoint;
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err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
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if (err != JVMTI_ERROR_NONE) {
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printf("(SetEventCallbacks) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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} else {
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printf("Warning: Breakpoint event is not implemented\n");
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}
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return JNI_OK;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass008_setBreakpoints(JNIEnv *env,
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jclass cls, jint vrb, jobject redefObj) {
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jvmtiError err;
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int i;
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if (!caps.can_redefine_classes || !caps.can_generate_breakpoint_events) {
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return PASSED;
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}
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redefCls = env->GetObjectClass(redefObj);
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for (i=0; i<BP_NUM; i++) {
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/* get the JNI method ID for a method with name m_name and
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signature m_sign */
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if (breakpoints[i].inst) { /* an instance method */
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breakpoints[i].mid = env->GetMethodID(
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redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);
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if (breakpoints[i].mid == nullptr) {
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printf(
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"%s: Failed to get the method ID for the instance method \"%s\" with signature \"%s\"\n",
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__FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);
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return STATUS_FAILED;
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}
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} else { /* a static method */
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breakpoints[i].mid = env->GetStaticMethodID(
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redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);
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if (breakpoints[i].mid == nullptr) {
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printf(
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"%s: Failed to get the method ID for the static method \"%s\" with signature \"%s\"\n",
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__FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);
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return STATUS_FAILED;
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}
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}
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if (vrb == 1) {
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printf(
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">>>>>>>> #%d Invoke SetBreakpoint():\n"
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"\tbreakpoint in the %s method: name=\"%s\"; "
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"signature=\"%s\"; location=%d\n",
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i, breakpoints[i].inst ? "instance" : "static",
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breakpoints[i].m_name, breakpoints[i].m_sign, breakpoints[i].loc);
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}
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err = jvmti->SetBreakpoint(breakpoints[i].mid, breakpoints[i].loc);
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if (err != JVMTI_ERROR_NONE) {
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printf("%s: Failed to call SetBreakpoint(): error=%d: %s\n",
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__FILE__, err, TranslateError(err));
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return STATUS_FAILED;
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}
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_BREAKPOINT, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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printf("Failed to enable BREAKPOINT event: %s (%d)\n",
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TranslateError(err), err);
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return STATUS_FAILED;
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}
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if (vrb == 1)
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printf("<<<<<<<< #%d SetBreakpoint() is successfully done\n\n", i);
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}
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return PASSED;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass008_makeRedefinition(JNIEnv *env,
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jclass cls, jint vrb, jclass redefCls, jbyteArray classBytes) {
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jvmtiError err;
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jvmtiClassDefinition classDef;
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if (jvmti == nullptr) {
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printf("JVMTI client was not properly loaded!\n");
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return STATUS_FAILED;
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}
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if (!caps.can_redefine_classes || !caps.can_generate_breakpoint_events) {
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return PASSED;
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}
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/* fill the structure jvmtiClassDefinition */
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classDef.klass = redefCls;
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classDef.class_byte_count = env->GetArrayLength(classBytes);
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classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(classBytes, nullptr);
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if (vrb == 1)
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printf(">>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n",
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classDef.class_byte_count);
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err = jvmti->RedefineClasses(1, &classDef);
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if (err != JVMTI_ERROR_NONE) {
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printf("%s: Failed to call RedefineClasses(): error=%d: %s\n",
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__FILE__, err, TranslateError(err));
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printf("\tFor more info about this error see the JVMTI spec.\n");
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return STATUS_FAILED;
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}
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if (vrb == 1)
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printf("<<<<<<<< RedefineClasses() is successfully done\n\n");
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return PASSED;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass008_getResult(JNIEnv *env,
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jclass cls, jint vrb, jobject redefObj) {
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jvmtiError err;
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int i;
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int totRes = PASSED;
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if (!caps.can_redefine_classes || !caps.can_generate_breakpoint_events) {
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return PASSED;
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}
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redefCls = env->GetObjectClass(redefObj);
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/* all breakpoints should be cleared after the redefinition */
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for (i=0; i<BP_NUM; i++) {
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/* get again the JNI method ID for a method with name m_name and
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signature m_sign */
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if (breakpoints[i].inst) { /* an instance method */
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breakpoints[i].mid = env->GetMethodID(
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redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);
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if (breakpoints[i].mid == nullptr) {
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printf(
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"%s: getResult: Failed to get the method ID for the instance method"
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"\"%s\" with signature \"%s\"\n",
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__FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);
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return STATUS_FAILED;
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}
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} else { /* a static method */
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breakpoints[i].mid = env->GetStaticMethodID(
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redefCls, breakpoints[i].m_name, breakpoints[i].m_sign);
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if (breakpoints[i].mid == nullptr) {
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printf(
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"%s: getResult: Failed to get the method ID for the static method"
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"\"%s\" with signature \"%s\"\n",
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__FILE__, breakpoints[i].m_name, breakpoints[i].m_sign);
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return STATUS_FAILED;
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}
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}
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err = jvmti->ClearBreakpoint(breakpoints[i].mid, breakpoints[i].loc);
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if (err != JVMTI_ERROR_NOT_FOUND) {
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printf(
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"TEST FAILED: Breakpoint #%d in the %s method:\n"
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"\tname=\"%s\"; signature=\"%s\"; location=%d was not cleared:\n"
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"\tClearBreakpoint() returned the error %d: %s\n\n",
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i, breakpoints[i].inst ? "instance" : "static",
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breakpoints[i].m_name, breakpoints[i].m_sign,
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breakpoints[i].loc, err, TranslateError(err));
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totRes = STATUS_FAILED;
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} else {
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if (vrb == 1) {
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printf(
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"Check #%d PASSED: Breakpoint in the %s method:\n"
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"\tname=\"%s\"; signature=\"%s\"; location=%d was cleared:\n"
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"\tClearBreakpoint() returned the error %d: %s\n\n",
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i, breakpoints[i].inst ? "instance" : "static",
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breakpoints[i].m_name, breakpoints[i].m_sign,
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breakpoints[i].loc, err, TranslateError(err));
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}
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err = jvmti->SetBreakpoint(breakpoints[i].mid, breakpoints[i].loc);
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if (err == JVMTI_ERROR_DUPLICATE) {
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printf(
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"TEST FAILED: the function SetBreakpoint() returned the error %d: %s\n"
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"\ti.e. the breakpoint #%d has not been really cleared.\n\n",
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err, TranslateError(err), i);
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totRes = STATUS_FAILED;
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}
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}
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}
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return totRes;
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}
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}
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