307 lines
10 KiB
C++
307 lines
10 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 <inttypes.h>
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#include "jvmti.h"
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#include "jvmti_common.h"
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extern "C" {
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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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jfieldID fid;
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char *m_cls;
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char *m_name;
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char *m_sig;
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jlocation loc;
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char *f_cls;
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char *f_name;
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char *f_sig;
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jboolean is_static;
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} writable_watch_info;
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typedef struct {
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jfieldID fid;
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const char *m_cls;
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const char *m_name;
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const char *m_sig;
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jlocation loc;
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const char *f_cls;
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const char *f_name;
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const char *f_sig;
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jboolean is_static;
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} watch_info;
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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 volatile jboolean isVirtualExpected = JNI_FALSE;
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static int eventsExpected = 0;
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static int eventsCount = 0;
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static watch_info watches[] = {
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{ nullptr, "Lfieldacc04a;", "run", "()I", 2,
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"Lfieldacc04a;", "interfaceObject",
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"Ljava/lang/Object;", JNI_TRUE },
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{ nullptr, "Lfieldacc04a;", "run", "()I", 12,
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"Lfieldacc04a;", "interfaceArrInt",
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"[I", JNI_TRUE }
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};
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void JNICALL FieldAccess(jvmtiEnv *jvmti, JNIEnv *jni,
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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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jvmtiError err;
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jclass cls;
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writable_watch_info watch;
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char *generic;
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eventsCount++;
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LOG(">>> retrieving access watch info ...\n");
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watch.fid = field;
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watch.loc = location;
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watch.is_static = (obj == nullptr) ? JNI_TRUE : JNI_FALSE;
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err = jvmti->GetMethodDeclaringClass(method, &cls);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetMethodDeclaringClass) unexpected error: %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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err = jvmti->GetClassSignature(cls, &watch.m_cls, &generic);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetClassSignature) unexpected error: %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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err = jvmti->GetMethodName(method, &watch.m_name, &watch.m_sig, &generic);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetMethodName) unexpected error: %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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err = jvmti->GetClassSignature(field_klass, &watch.f_cls, &generic);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetClassSignature) unexpected error: %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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err = jvmti->GetFieldName(field_klass, field, &watch.f_name, &watch.f_sig, &generic);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetFieldName) unexpected error: %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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LOG(">>> class: \"%s\"\n", watch.m_cls);
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LOG(">>> method: \"%s%s\"\n", watch.m_name, watch.m_sig);
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LOG(">>> location: 0x%x%08x\n", (jint)(watch.loc >> 32), (jint)watch.loc);
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LOG(">>> field cls: \"%s\"\n", watch.f_cls);
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LOG(">>> field: \"%s:%s\"\n", watch.f_name, watch.f_sig);
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LOG(">>> object: 0x%p\n", obj);
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LOG(">>> ... done\n");
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for (size_t i = 0; i < sizeof(watches)/sizeof(watch_info); i++) {
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if (watch.fid == watches[i].fid) {
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if (watch.m_cls == nullptr || strcmp(watch.m_cls, watches[i].m_cls) != 0) {
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LOG("(watch#%" PRIuPTR ") wrong class: \"%s\", expected: \"%s\"\n", i, watch.m_cls, watches[i].m_cls);
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result = STATUS_FAILED;
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}
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if (watch.m_name == nullptr || strcmp(watch.m_name, watches[i].m_name) != 0) {
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LOG("(watch#%" PRIuPTR ") wrong method name: \"%s\"", i, watch.m_name);
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LOG(", expected: \"%s\"\n", watches[i].m_name);
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result = STATUS_FAILED;
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}
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if (watch.m_sig == nullptr || strcmp(watch.m_sig, watches[i].m_sig) != 0) {
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LOG("(watch#%" PRIuPTR ") wrong method sig: \"%s\"", i, watch.m_sig);
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LOG(", expected: \"%s\"\n", watches[i].m_sig);
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result = STATUS_FAILED;
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}
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if (watch.loc != watches[i].loc) {
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LOG("(watch#%" PRIuPTR ") wrong location: 0x%x%08x", i, (jint)(watch.loc >> 32), (jint)watch.loc);
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LOG(", expected: 0x%x%08x\n", (jint)(watches[i].loc >> 32), (jint)watches[i].loc);
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result = STATUS_FAILED;
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}
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if (watch.f_name == nullptr || strcmp(watch.f_name, watches[i].f_name) != 0) {
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LOG("(watch#%" PRIuPTR ") wrong field name: \"%s\"", i, watch.f_name);
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LOG(", expected: \"%s\"\n", watches[i].f_name);
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result = STATUS_FAILED;
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}
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if (watch.f_sig == nullptr || strcmp(watch.f_sig, watches[i].f_sig) != 0) {
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LOG("(watch#%" PRIuPTR ") wrong field sig: \"%s\"", i, watch.f_sig);
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LOG(", expected: \"%s\"\n", watches[i].f_sig);
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result = STATUS_FAILED;
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}
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if (watch.is_static != watches[i].is_static) {
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LOG("(watch#%" PRIuPTR ") wrong field type: %s", i, (watch.is_static == JNI_TRUE) ? "static" : "instance");
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LOG(", expected: %s\n", (watches[i].is_static == JNI_TRUE) ? "static" : "instance");
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result = STATUS_FAILED;
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}
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jboolean isVirtual = jni->IsVirtualThread(thr);
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if (isVirtualExpected != isVirtual) {
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LOG("The thread IsVirtualThread %d differs from expected %d.\n", isVirtual, isVirtualExpected);
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result = STATUS_FAILED;
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}
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return;
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}
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}
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LOG("Unexpected field access catched: 0x%p\n", watch.fid);
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result = STATUS_FAILED;
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}
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jvmtiCapabilities caps;
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jvmtiError err;
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jint res;
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res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
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if (res != JNI_OK || jvmti == nullptr) {
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LOG("Wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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memset(&caps, 0, sizeof(jvmtiCapabilities));
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caps.can_generate_field_access_events = 1;
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caps.can_support_virtual_threads = 1;
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(AddCapabilities) unexpected error: %s (%d)\n", 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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LOG("(GetCapabilities) unexpected error: %s (%d)\n", 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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LOG("(SetEventCallbacks) unexpected error: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_FIELD_ACCESS, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Failed to enable JVMTI_EVENT_FIELD_ACCESS: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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} else {
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LOG("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_fieldacc04_getReady(JNIEnv *jni, jclass klass) {
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jvmtiError err;
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jclass cls;
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jthread thread;
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LOG(">>> setting field access watches ...\n");
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err = jvmti->GetCurrentThread(&thread);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Failed to get current thread: %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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eventsCount = 0;
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eventsExpected = 0;
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isVirtualExpected = jni->IsVirtualThread(thread);
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for (size_t i = 0; i < sizeof(watches)/sizeof(watch_info); i++) {
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cls = jni->FindClass(watches[i].f_cls);
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if (cls == nullptr) {
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LOG("Cannot find %s class!\n", watches[i].f_cls);
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result = STATUS_FAILED;
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return;
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}
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if (watches[i].is_static == JNI_TRUE) {
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watches[i].fid = jni->GetStaticFieldID(cls, watches[i].f_name, watches[i].f_sig);
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} else {
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watches[i].fid = jni->GetFieldID(cls, watches[i].f_name, watches[i].f_sig);
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}
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if (watches[i].fid == nullptr) {
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LOG("Cannot get field ID for \"%s:%s\"\n", watches[i].f_name, watches[i].f_sig);
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result = STATUS_FAILED;
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return;
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}
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err = jvmti->SetFieldAccessWatch(cls, watches[i].fid);
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if (err == JVMTI_ERROR_NONE) {
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eventsExpected++;
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} else {
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LOG("(SetFieldAccessWatch#%" PRIuPTR ") unexpected error: %s (%d)\n", i, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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LOG(">>> ... done\n");
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}
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JNIEXPORT jint JNICALL
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Java_fieldacc04_check(JNIEnv *jni, jclass clz) {
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if (eventsCount != eventsExpected) {
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LOG("Wrong number of field access events: %d, expected: %d\n", eventsCount, eventsExpected);
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result = STATUS_FAILED;
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}
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for (size_t i = 0; i < sizeof(watches)/sizeof(watch_info); i++) {
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jclass cls = jni->FindClass(watches[i].f_cls);
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if (cls == nullptr) {
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LOG("Cannot find %s class!\n", watches[i].f_cls);
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result = STATUS_FAILED;
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return result;
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}
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jvmtiError err = jvmti->ClearFieldAccessWatch(cls, watches[i].fid);
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if (err == JVMTI_ERROR_NONE) {
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eventsExpected++;
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} else {
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LOG("(ClearFieldAccessWatch#%" PRIuPTR ") unexpected error: %s (%d)\n", i, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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return result;
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}
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JNIEXPORT jint JNICALL Agent_OnLoad(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(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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}
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