| /* |
| * Copyright (c) 2003, 2018, 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" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef JNI_ENV_ARG |
| |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG(x, y) y |
| #define JNI_ENV_PTR(x) x |
| #else |
| #define JNI_ENV_ARG(x,y) x, y |
| #define JNI_ENV_PTR(x) (*x) |
| #endif |
| |
| #endif |
| |
| #define PASSED 0 |
| #define STATUS_FAILED 2 |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jvmtiCapabilities caps; |
| static jvmtiEventCallbacks callbacks; |
| static jint result = PASSED; |
| static jboolean printdump = JNI_FALSE; |
| static jmethodID mid = NULL; |
| static jint bpeakpointsExpected = 0; |
| static jint bpeakpointsCount = 0; |
| static jlocation loc = 0; |
| static jbyteArray classBytes; |
| static jint magicNumber; |
| |
| void check(jvmtiEnv *jvmti_env, jthread thr, jclass cls, jmethodID mid, jint i) { |
| jvmtiError err; |
| char *sigClass, *name, *sig, *generic; |
| jvmtiLocalVariableEntry *table = NULL; |
| jint entryCount = 0; |
| jint varValue = -1; |
| jint j; |
| |
| err = (*jvmti_env)->GetClassSignature(jvmti_env, cls, &sigClass, &generic); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetClassSignature#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->GetMethodName(jvmti_env, mid, &name, &sig, &generic); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetMethodName#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->GetLocalVariableTable(jvmti_env, mid, |
| &entryCount, &table); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetLocalVariableTable#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| if (table != NULL) { |
| for (j = 0; j < entryCount; j++) { |
| if (strcmp(table[j].name, "localVar") == 0) { |
| err = (*jvmti_env)->GetLocalInt(jvmti_env, thr, 0, |
| table[j].slot, &varValue); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetLocalInt#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| } |
| } |
| } |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> bp %d: \"%s.%s%s\"", i, sigClass, name, sig); |
| printf(", localVar value: %d\n", varValue); |
| } |
| |
| if (varValue != i) { |
| printf("(bp %d) wrong localVar value: %d,", i, varValue); |
| printf(" expected: %d\n", i); |
| result = STATUS_FAILED; |
| } |
| |
| if (sigClass != NULL) { |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)sigClass); |
| } |
| if (name != NULL) { |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)name); |
| } |
| if (sig != NULL) { |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)sig); |
| } |
| if (table != NULL) { |
| for (j = 0; j < entryCount; j++) { |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)(table[j].name)); |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)(table[j].signature)); |
| } |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)table); |
| } |
| } |
| |
| void JNICALL Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *env, |
| jthread thread, jmethodID method, jlocation location) { |
| jvmtiError err; |
| jclass klass; |
| unsigned char *bytes; |
| jvmtiClassDefinition classDef; |
| jboolean found = JNI_FALSE; |
| jint i; |
| |
| if (mid != method) { |
| printf("bp: don't know where we get called from"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| err = (*jvmti_env)->GetMethodDeclaringClass(jvmti_env, method, &klass); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetMethodDeclaringClass#%d) unexpected error: %s (%d)\n", |
| bpeakpointsCount, TranslateError(err), err); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| check(jvmti_env, thread, klass, method, bpeakpointsCount); |
| bpeakpointsCount++; |
| |
| classDef.klass = klass; |
| classDef.class_byte_count = |
| JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG((JNIEnv *)env, classBytes)); |
| bytes = (unsigned char *) |
| JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG((JNIEnv *)env, |
| classBytes), NULL); |
| |
| for (i = 0; i < classDef.class_byte_count - 3; i++) { |
| if (((jint)bytes[i+3] | |
| ((jint)bytes[i+2] << 8) | |
| ((jint)bytes[i+1] << 16) | |
| ((jint)bytes[i] << 24)) == magicNumber) { |
| found = JNI_TRUE; |
| break; |
| } |
| } |
| |
| if (found == JNI_TRUE) { |
| bytes[i] = 0; |
| bytes[i+1] = 0; |
| bytes[i+2] = 0; |
| bytes[i+3] = (jbyte)bpeakpointsCount; |
| } else { |
| printf("Cannot find magic number\n"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| classDef.class_bytes = bytes; |
| err = (*jvmti_env)->RedefineClasses(jvmti_env, 1, &classDef); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(RedefineClasses#%d) unexpected error: %s (%d)\n", |
| bpeakpointsCount, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->SetBreakpoint(jvmti_env, mid, loc); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(SetBreakpoint#%d) unexpected error: %s (%d)\n", |
| bpeakpointsCount, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| } |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_redefclass016(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_redefclass016(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_redefclass016(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 = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (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(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->AddCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(AddCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| if (!caps.can_redefine_classes) { |
| printf("Warning: RedefineClasses is not implemented\n"); |
| } |
| |
| if (!caps.can_get_line_numbers) { |
| printf("Warning: GetLineNumberTable is not implemented\n"); |
| } |
| |
| if (!caps.can_access_local_variables) { |
| printf("Warning: access to local variables is not implemented\n"); |
| } |
| |
| if (caps.can_generate_breakpoint_events) { |
| callbacks.Breakpoint = &Breakpoint; |
| err = (*jvmti)->SetEventCallbacks(jvmti, &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_RedefineClasses_redefclass016_getReady(JNIEnv *env, jclass cls, |
| jclass clazz, jbyteArray bytes, jint magic, jint line) { |
| jvmtiError err; |
| jvmtiLineNumberEntry *lines = NULL; |
| jint i = 0, entryCount = 0; |
| |
| if (jvmti == NULL) { |
| printf("JVMTI client was not properly loaded!\n"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| if (!caps.can_redefine_classes || |
| !caps.can_generate_breakpoint_events || |
| !caps.can_get_line_numbers || |
| !caps.can_access_local_variables) return; |
| |
| mid = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, clazz), "run", "()V"); |
| if (mid == NULL) { |
| printf("Cannot find Method ID for method run\n"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| classBytes = JNI_ENV_PTR(env)->NewGlobalRef(JNI_ENV_ARG(env, bytes)); |
| |
| err = (*jvmti)->GetLineNumberTable(jvmti, mid, &entryCount, &lines); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetLineNumberTable) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| if (lines != NULL && entryCount > 0) { |
| for (i = 0; i < entryCount; i++) { |
| if (line == lines[i].line_number) { |
| loc = lines[i].start_location; |
| break; |
| } |
| } |
| } |
| if (i == entryCount) { |
| printf("Cannot find line number entry for %d\n", line); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| err = (*jvmti)->SetBreakpoint(jvmti, mid, loc); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(SetBreakpoint) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, 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; |
| } |
| |
| magicNumber = magic; |
| bpeakpointsExpected = 8; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass016_check(JNIEnv *env, jclass cls) { |
| if (bpeakpointsCount != bpeakpointsExpected) { |
| printf("Wrong number of breakpoints: %d, expected: %d\n", |
| bpeakpointsCount, bpeakpointsExpected); |
| result = STATUS_FAILED; |
| } |
| return result; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
