242 lines
7.7 KiB
C++
242 lines
7.7 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 <ctype.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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typedef struct {
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const char *klass;
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const char *name;
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const char *sig;
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int stat;
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jfieldID fid;
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jfieldID thrown_fid;
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} field;
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static jvmtiEnv *jvmti;
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static jvmtiEventCallbacks callbacks;
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static jvmtiCapabilities caps;
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static jint result = PASSED;
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static field fields[] = {
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{"nsk/jvmti/SetFieldAccessWatch/setfldw001", "fld0", "I", 0, NULL, NULL},
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{"nsk/jvmti/SetFieldAccessWatch/setfldw001", "fld1", "I", 1, NULL, NULL},
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{"nsk/jvmti/SetFieldAccessWatch/setfldw001", "fld2",
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"Lnsk/jvmti/SetFieldAccessWatch/setfldw001a;", 0, NULL, NULL},
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{"nsk/jvmti/SetFieldAccessWatch/setfldw001a", "fld3", "[I", 0, NULL, NULL},
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{"nsk/jvmti/SetFieldAccessWatch/setfldw001b", "fld4", "F", 0, NULL, NULL},
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};
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void setWatch(JNIEnv *env, jint ind) {
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jvmtiError err;
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jclass cls;
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field fld = fields[ind];
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cls = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, fld.klass));
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if (cls == NULL) {
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printf("Cannot find class \"%s\"\n", fld.klass);
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result = STATUS_FAILED;
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return;
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}
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if (fld.fid == NULL) {
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if (fld.stat) {
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fields[ind].fid = JNI_ENV_PTR(env)->
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GetStaticFieldID(JNI_ENV_ARG(env, cls), fld.name, fld.sig);
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} else {
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fields[ind].fid = JNI_ENV_PTR(env)->
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GetFieldID(JNI_ENV_ARG(env, cls), fld.name, fld.sig);
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}
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}
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err = jvmti->SetFieldAccessWatch(cls, fields[ind].fid);
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if (err == JVMTI_ERROR_MUST_POSSESS_CAPABILITY &&
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!caps.can_generate_field_access_events) {
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/* Ok, it's expected */
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} else if (err != JVMTI_ERROR_NONE) {
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printf("(SetFieldAccessWatch#%d) unexpected error: %s (%d)\n",
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ind, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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void JNICALL FieldAccess(jvmtiEnv *jvmti_env, JNIEnv *env,
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jthread thr, jmethodID method,
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jlocation location, jclass field_klass, jobject obj, jfieldID field) {
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char *fld_name = NULL;
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jint fld_ind = 0;
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size_t len = 0;
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jvmtiError err = jvmti_env->GetFieldName(field_klass, field,
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&fld_name, NULL, NULL);
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if (err != JVMTI_ERROR_NONE) {
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printf("Error in GetFieldName: %s (%d)\n", TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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if (fld_name == NULL) {
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printf("GetFieldName returned NULL field name\n");
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result = STATUS_FAILED;
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return;
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}
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len = strlen(fld_name);
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/* All field names have the same length and end with a digit. */
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if (len != strlen(fields[0].name) || !isdigit(fld_name[len - 1])) {
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printf("GetFieldName returned unexpected field name: %s\n", fld_name);
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result = STATUS_FAILED;
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return;
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}
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fld_ind = (int)(fld_name[len - 1] - '0'); /* last digit is index in the array */
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fields[fld_ind].thrown_fid = field;
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jvmti_env->Deallocate((unsigned char*) fld_name);
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}
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNICALL Agent_OnLoad_setfldw001(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_setfldw001(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_setfldw001(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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jint res;
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jvmtiError err;
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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(&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_generate_field_access_events) {
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callbacks.FieldAccess = &FieldAccess;
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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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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
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JVMTI_EVENT_FIELD_ACCESS, NULL);
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if (err != JVMTI_ERROR_NONE) {
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printf("Failed to enable JVMTI_EVENT_FIELD_ACCESS: %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: FieldAccess watch 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_SetFieldAccessWatch_setfldw001_setWatch(JNIEnv *env,
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jclass cls, jint fld_ind) {
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setWatch(env, fld_ind);
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}
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JNIEXPORT void JNICALL
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Java_nsk_jvmti_SetFieldAccessWatch_setfldw001_touchfld0(JNIEnv *env,
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jobject obj) {
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jint val;
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setWatch(env, (jint)0);
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val = JNI_ENV_PTR(env)->GetIntField(JNI_ENV_ARG(env, obj), fields[0].fid);
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}
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JNIEXPORT void JNICALL
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Java_nsk_jvmti_SetFieldAccessWatch_setfldw001_check(JNIEnv *env,
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jclass cls, jint fld_ind, jboolean flag) {
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jfieldID thrown_fid = fields[fld_ind].thrown_fid;
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if (caps.can_generate_field_access_events) {
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if (flag == JNI_FALSE && thrown_fid != NULL) {
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result = STATUS_FAILED;
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printf("(Field %d) FIELD_ACCESS event without access watch set\n",
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fld_ind);
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} else if (flag == JNI_TRUE && thrown_fid != fields[fld_ind].fid) {
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result = STATUS_FAILED;
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printf("(Field %d) thrown field ID expected: 0x%p, got: 0x%p\n",
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fld_ind, fields[fld_ind].fid, thrown_fid);
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}
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}
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_SetFieldAccessWatch_setfldw001_getRes(JNIEnv *env, jclass cls) {
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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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