| /* |
| * 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 |
| |
| typedef struct { |
| const char *name; |
| const char *sig; |
| jint value; |
| } var_info; |
| |
| typedef struct { |
| jboolean isObsolete; |
| const char *name; |
| const char *sig; |
| jint line; |
| jint count; |
| var_info *vars; |
| } frame_info; |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jvmtiCapabilities caps; |
| static jvmtiEventCallbacks callbacks; |
| static jint result = PASSED; |
| static jboolean printdump = JNI_FALSE; |
| static jbyteArray classBytes; |
| static jmethodID midCheckPoint = NULL; |
| static jmethodID midRun = NULL; |
| static jint framesExpected = 0; |
| static jint framesCount = 0; |
| |
| static const char *cls_exp = "Lnsk/jvmti/RedefineClasses/redefclass019a;"; |
| |
| static var_info run[] = { |
| {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0} |
| }; |
| |
| static var_info checkPoint[] = { |
| {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0} |
| }; |
| |
| static var_info chain1[] = { |
| {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0}, |
| {"localInt1", "I", 2}, |
| {"localInt2", "I", 3333} |
| }; |
| |
| static var_info chain2[] = { |
| {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0} |
| }; |
| |
| static var_info chain3[] = { |
| {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0} |
| }; |
| |
| static frame_info frames[] = { |
| {JNI_TRUE, "checkPoint", "()V", 115, 1, checkPoint}, |
| {JNI_FALSE, "chain3", "()V", 49, 1, chain3}, |
| {JNI_FALSE, "chain2", "()V", 44, 1, chain2}, |
| {JNI_FALSE, "chain1", "()V", 39, 3, chain1}, |
| {JNI_FALSE, "run", "()V", 32, 1, run}, |
| }; |
| |
| |
| void check(jvmtiEnv *jvmti_env, jthread thr, jmethodID mid, jint i) { |
| jvmtiError err; |
| jclass cls; |
| jlocation loc; |
| char *sigClass, *name = NULL, *sig = NULL, *generic; |
| jboolean is_obsolete; |
| jvmtiLineNumberEntry *lines = NULL; |
| jvmtiLocalVariableEntry *table = NULL; |
| jint line = -1; |
| jint entryCount = 0; |
| jint varValue = -1; |
| jint j, k; |
| |
| if (i >= (jint) (sizeof(frames)/sizeof(frame_info))) { |
| printf("(pop %d) too many frames\n", i); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| err = (*jvmti_env)->GetFrameLocation(jvmti_env, thr, 0, &mid, &loc); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetClassSignature#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->GetMethodDeclaringClass(jvmti_env, mid, &cls); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetMethodDeclaringClass#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| 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; |
| } |
| |
| if (sigClass == NULL || strcmp(sigClass, cls_exp) != 0) { |
| printf("(pop %d) wrong class sig: \"%s\",", i, sigClass); |
| printf(" expected: \"%s\"\n", cls_exp); |
| if (sigClass != NULL) { |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)sigClass); |
| } |
| result = STATUS_FAILED; |
| } else { |
| 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)->IsMethodObsolete(jvmti_env, mid, &is_obsolete); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(IsMethodObsolete#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> pop %d: \"%s.%s%s\"%s\n", i, sigClass, name, sig, |
| (is_obsolete == JNI_TRUE) ? " (obsolete)" : ""); |
| } |
| if (frames[i].isObsolete != is_obsolete) { |
| printf("(pop %d) %s obsolete method\n", i, |
| (is_obsolete == JNI_TRUE) ? "unexpected" : "should be"); |
| result = STATUS_FAILED; |
| } |
| if (name == NULL || strcmp(name, frames[i].name) != 0) { |
| printf("(pop %d) wrong method name: \"%s\",", i, name); |
| printf(" expected: \"%s\"\n", frames[i].name); |
| result = STATUS_FAILED; |
| } |
| if (sig == NULL || strcmp(sig, frames[i].sig) != 0) { |
| printf("(pop %d) wrong method sig: \"%s\",", i, sig); |
| printf(" expected: \"%s\"\n", frames[i].sig); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->GetLineNumberTable(jvmti_env, mid, |
| &entryCount, &lines); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetClassSignature#%d) unexpected error: %s (%d)\n", |
| i, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| if (lines != NULL && entryCount > 0) { |
| for (k = 0; k < entryCount; k++) { |
| if (loc < lines[k].start_location) { |
| break; |
| } |
| } |
| line = lines[k-1].line_number; |
| } |
| if (line != frames[i].line) { |
| printf("(pop %d) wrong line number: %d, expected: %d\n", |
| i, line, frames[i].line); |
| 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 (frames[i].count != entryCount) { |
| printf("(pop %d) wrong number of locals: %d, expected: %d\n", |
| i, entryCount, frames[i].count); |
| result = STATUS_FAILED; |
| } |
| |
| if (table != NULL) { |
| for (k = 0; k < frames[i].count; k++) { |
| for (j = 0; j < entryCount; j++) { |
| if (strcmp(table[j].name, frames[i].vars[k].name) == 0 && |
| strcmp(table[j].signature, frames[i].vars[k].sig) == 0) { |
| if (table[j].signature[0] == 'I') { |
| 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(">>> var: \"%s %s\"", |
| table[j].name, table[j].signature); |
| printf(", value: %d\n", varValue); |
| } |
| if (varValue != frames[i].vars[k].value) { |
| printf("(pop %d) wrong local var value: %d,", |
| i, varValue); |
| printf(" expected: %d\n", frames[i].vars[k].value); |
| result = STATUS_FAILED; |
| } |
| } else if (printdump == JNI_TRUE) { |
| printf(">>> var: \"%s %s\"\n", |
| table[j].name, table[j].signature); |
| } |
| break; |
| } |
| } |
| if (j == entryCount) { |
| printf("(pop %d) var \"%s %s\" not found\n", |
| i, frames[i].vars[k].name, frames[i].vars[k].sig); |
| 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 (lines != NULL) { |
| (*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)lines); |
| } |
| 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; |
| jvmtiClassDefinition classDef; |
| |
| if (midCheckPoint != method) { |
| printf("bp: don't know where we get called from\n"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> breakpoint in checkPoint\n"); |
| } |
| |
| err = (*jvmti_env)->ClearBreakpoint(jvmti_env, midCheckPoint, 0); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(ClearBreakpoint) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->GetMethodDeclaringClass(jvmti_env, method, &klass); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetMethodDeclaringClass) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| classDef.klass = klass; |
| classDef.class_byte_count = |
| JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG((JNIEnv *)env, classBytes)); |
| classDef.class_bytes = (unsigned char *) |
| JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG((JNIEnv *)env, |
| classBytes), NULL); |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> about to call RedefineClasses\n"); |
| } |
| |
| err = (*jvmti_env)->RedefineClasses(jvmti_env, 1, &classDef); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(RedefineClasses) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| |
| err = (*jvmti_env)->NotifyFramePop(jvmti_env, thread, 0); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(NotifyFramePop) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| } |
| |
| void JNICALL FramePop(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, |
| jmethodID method, jboolean wasPopedByException) { |
| jvmtiError err; |
| |
| check(jvmti_env, thread, method, framesCount); |
| framesCount++; |
| if (method != midRun) { |
| err = (*jvmti_env)->NotifyFramePop(jvmti_env, thread, 1); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(NotifyFramePop#%d) unexpected error: %s (%d)\n", |
| framesCount, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| } else { |
| if (printdump == JNI_TRUE) { |
| printf(">>> poped %d frames till method \"run()\"\n", |
| framesCount); |
| } |
| } |
| } |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_redefclass019(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_redefclass019(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_redefclass019(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 && |
| caps.can_generate_frame_pop_events) { |
| callbacks.Breakpoint = &Breakpoint; |
| callbacks.FramePop = &FramePop; |
| 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_redefclass019_getReady(JNIEnv *env, jclass cls, |
| jclass clazz, jbyteArray bytes, jint depth) { |
| jvmtiError err; |
| |
| 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_generate_frame_pop_events || |
| !caps.can_get_line_numbers || |
| !caps.can_access_local_variables) return; |
| |
| classBytes = JNI_ENV_PTR(env)->NewGlobalRef(JNI_ENV_ARG(env, bytes)); |
| |
| midRun = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, clazz), |
| "run", "()V"); |
| if (midRun == NULL) { |
| printf("Cannot find Method ID for method run\n"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| midCheckPoint = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, clazz), |
| "checkPoint", "()V"); |
| if (midCheckPoint == NULL) { |
| printf("Cannot find Method ID for method checkPoint\n"); |
| result = STATUS_FAILED; |
| return; |
| } |
| |
| err = (*jvmti)->SetBreakpoint(jvmti, midCheckPoint, 0); |
| 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; |
| return; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| JVMTI_EVENT_FRAME_POP, NULL); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("Failed to enable FRAME_POP event: %s (%d)\n", |
| TranslateError(err), err); |
| result = STATUS_FAILED; |
| } else { |
| framesExpected = depth; |
| } |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass019_check(JNIEnv *env, jclass cls) { |
| if (framesCount != framesExpected) { |
| printf("Wrong number of frames: %d, expected: %d\n", |
| framesCount, framesExpected); |
| result = STATUS_FAILED; |
| } |
| return result; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
