359 lines
11 KiB
C
359 lines
11 KiB
C
/*
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* Copyright (c) 2003, 2018, 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.h"
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#include "JVMTITools.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef JNI_ENV_ARG
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#ifdef __cplusplus
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#define JNI_ENV_ARG(x, y) y
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#define JNI_ENV_PTR(x) x
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#else
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#define JNI_ENV_ARG(x,y) x, y
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#define JNI_ENV_PTR(x) (*x)
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#endif
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#endif
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#define PASSED 0
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#define STATUS_FAILED 2
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static jvmtiEnv *jvmti = NULL;
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static jvmtiCapabilities caps;
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static jvmtiEventCallbacks callbacks;
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static jint result = PASSED;
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static jboolean printdump = JNI_FALSE;
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static jmethodID mid = NULL;
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static jint bpeakpointsExpected = 0;
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static jint bpeakpointsCount = 0;
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static jlocation loc = 0;
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static jbyteArray classBytes;
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static jint magicNumber;
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void check(jvmtiEnv *jvmti_env, jthread thr, jclass cls, jmethodID mid, jint i) {
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jvmtiError err;
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char *sigClass, *name, *sig, *generic;
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jvmtiLocalVariableEntry *table = NULL;
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jint entryCount = 0;
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jint varValue = -1;
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jint j;
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err = (*jvmti_env)->GetClassSignature(jvmti_env, cls, &sigClass, &generic);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetClassSignature#%d) unexpected error: %s (%d)\n",
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i, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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err = (*jvmti_env)->GetMethodName(jvmti_env, mid, &name, &sig, &generic);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetMethodName#%d) unexpected error: %s (%d)\n",
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i, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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err = (*jvmti_env)->GetLocalVariableTable(jvmti_env, mid,
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&entryCount, &table);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetLocalVariableTable#%d) unexpected error: %s (%d)\n",
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i, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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if (table != NULL) {
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for (j = 0; j < entryCount; j++) {
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if (strcmp(table[j].name, "localVar") == 0) {
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err = (*jvmti_env)->GetLocalInt(jvmti_env, thr, 0,
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table[j].slot, &varValue);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetLocalInt#%d) unexpected error: %s (%d)\n",
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i, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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}
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}
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if (printdump == JNI_TRUE) {
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printf(">>> bp %d: \"%s.%s%s\"", i, sigClass, name, sig);
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printf(", localVar value: %d\n", varValue);
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}
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if (varValue != i) {
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printf("(bp %d) wrong localVar value: %d,", i, varValue);
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printf(" expected: %d\n", i);
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result = STATUS_FAILED;
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}
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if (sigClass != NULL) {
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(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)sigClass);
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}
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if (name != NULL) {
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(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)name);
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}
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if (sig != NULL) {
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(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)sig);
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}
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if (table != NULL) {
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for (j = 0; j < entryCount; j++) {
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(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)(table[j].name));
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(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)(table[j].signature));
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}
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(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)table);
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}
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}
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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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jvmtiError err;
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jclass klass;
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unsigned char *bytes;
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jvmtiClassDefinition classDef;
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jboolean found = JNI_FALSE;
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jint i;
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if (mid != method) {
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printf("bp: don't know where we get called from");
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result = STATUS_FAILED;
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return;
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}
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err = (*jvmti_env)->GetMethodDeclaringClass(jvmti_env, method, &klass);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetMethodDeclaringClass#%d) unexpected error: %s (%d)\n",
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bpeakpointsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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check(jvmti_env, thread, klass, method, bpeakpointsCount);
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bpeakpointsCount++;
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classDef.klass = klass;
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classDef.class_byte_count =
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JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG((JNIEnv *)env, classBytes));
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bytes = (unsigned char *)
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JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG((JNIEnv *)env,
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classBytes), NULL);
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for (i = 0; i < classDef.class_byte_count - 3; i++) {
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if (((jint)bytes[i+3] |
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((jint)bytes[i+2] << 8) |
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((jint)bytes[i+1] << 16) |
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((jint)bytes[i] << 24)) == magicNumber) {
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found = JNI_TRUE;
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break;
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}
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}
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if (found == JNI_TRUE) {
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bytes[i] = 0;
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bytes[i+1] = 0;
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bytes[i+2] = 0;
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bytes[i+3] = (jbyte)bpeakpointsCount;
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} else {
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printf("Cannot find magic number\n");
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result = STATUS_FAILED;
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return;
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}
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classDef.class_bytes = bytes;
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err = (*jvmti_env)->RedefineClasses(jvmti_env, 1, &classDef);
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if (err != JVMTI_ERROR_NONE) {
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printf("(RedefineClasses#%d) unexpected error: %s (%d)\n",
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bpeakpointsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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err = (*jvmti_env)->SetBreakpoint(jvmti_env, mid, loc);
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if (err != JVMTI_ERROR_NONE) {
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printf("(SetBreakpoint#%d) unexpected error: %s (%d)\n",
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bpeakpointsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNICALL Agent_OnLoad_redefclass016(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_redefclass016(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_redefclass016(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 *jvm, char *options, void *reserved) {
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jvmtiError err;
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jint res;
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if (options != NULL && strcmp(options, "printdump") == 0) {
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printdump = JNI_TRUE;
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}
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res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
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JVMTI_VERSION_1_1);
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if (res != JNI_OK || jvmti == NULL) {
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printf("Wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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err = (*jvmti)->GetPotentialCapabilities(jvmti, &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(jvmti, &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(jvmti, &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_get_line_numbers) {
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printf("Warning: GetLineNumberTable is not implemented\n");
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}
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if (!caps.can_access_local_variables) {
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printf("Warning: access to local variables 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(jvmti, &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 void JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass016_getReady(JNIEnv *env, jclass cls,
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jclass clazz, jbyteArray bytes, jint magic, jint line) {
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jvmtiError err;
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jvmtiLineNumberEntry *lines = NULL;
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jint i = 0, entryCount = 0;
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if (jvmti == NULL) {
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printf("JVMTI client was not properly loaded!\n");
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result = STATUS_FAILED;
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return;
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}
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if (!caps.can_redefine_classes ||
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!caps.can_generate_breakpoint_events ||
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!caps.can_get_line_numbers ||
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!caps.can_access_local_variables) return;
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mid = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, clazz), "run", "()V");
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if (mid == NULL) {
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printf("Cannot find Method ID for method run\n");
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result = STATUS_FAILED;
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return;
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}
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classBytes = JNI_ENV_PTR(env)->NewGlobalRef(JNI_ENV_ARG(env, bytes));
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err = (*jvmti)->GetLineNumberTable(jvmti, mid, &entryCount, &lines);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetLineNumberTable) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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if (lines != NULL && entryCount > 0) {
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for (i = 0; i < entryCount; i++) {
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if (line == lines[i].line_number) {
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loc = lines[i].start_location;
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break;
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}
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}
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}
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if (i == entryCount) {
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printf("Cannot find line number entry for %d\n", line);
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result = STATUS_FAILED;
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return;
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}
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err = (*jvmti)->SetBreakpoint(jvmti, mid, loc);
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if (err != JVMTI_ERROR_NONE) {
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printf("(SetBreakpoint) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
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JVMTI_EVENT_BREAKPOINT, NULL);
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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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result = STATUS_FAILED;
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}
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magicNumber = magic;
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bpeakpointsExpected = 8;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass016_check(JNIEnv *env, jclass cls) {
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if (bpeakpointsCount != bpeakpointsExpected) {
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printf("Wrong number of breakpoints: %d, expected: %d\n",
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bpeakpointsCount, bpeakpointsExpected);
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result = STATUS_FAILED;
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}
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return result;
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}
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#ifdef __cplusplus
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}
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#endif
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