244 lines
7.7 KiB
C++
244 lines
7.7 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.hpp"
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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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char *name;
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char *sig;
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jlocation loc;
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} writable_entry_info;
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typedef struct {
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const char *name;
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const char *sig;
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const jlocation loc;
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} entry_info;
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static jvmtiEnv *jvmti = nullptr;
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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 isVirtualExpected = JNI_FALSE;
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static size_t eventsExpected = 0;
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static size_t eventsCount = 0;
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static entry_info entries[] = {
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{ "check", "()I", -1 },
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{ "dummy", "()V", 0 },
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{ "chain", "()V", -1 }
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};
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void JNICALL MethodEntry(jvmtiEnv *jvmti, JNIEnv *jni, jthread thread_obj, jmethodID method) {
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jvmtiError err;
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char *cls_sig, *generic;
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writable_entry_info entry;
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jclass cls;
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jmethodID mid;
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char buffer[32];
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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, &cls_sig, &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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if (cls_sig != nullptr && strcmp(cls_sig, "Lmentry01;") == 0) {
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LOG(">>> retrieving method entry info ...\n");
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err = jvmti->GetMethodName(method, &entry.name, &entry.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->GetFrameLocation(thread_obj, 0, &mid, &entry.loc);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetFrameLocation) 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", cls_sig);
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LOG(">>> method: \"%s%s\"\n", entry.name, entry.sig);
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LOG(">>> location: %s\n", jlong_to_string(entry.loc, buffer));
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LOG(">>> ... done\n");
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if (eventsCount < sizeof(entries)/sizeof(entry_info)) {
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if (entry.name == nullptr || strcmp(entry.name, entries[eventsCount].name) != 0) {
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LOG("(entry#%" PRIuPTR ") wrong method name: \"%s\"", eventsCount, entry.name);
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LOG(", expected: \"%s\"\n", entries[eventsCount].name);
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result = STATUS_FAILED;
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}
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if (entry.sig == nullptr || strcmp(entry.sig, entries[eventsCount].sig) != 0) {
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LOG("(entry#%" PRIuPTR ") wrong method sig: \"%s\"", eventsCount, entry.sig);
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LOG(", expected: \"%s\"\n", entries[eventsCount].sig);
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result = STATUS_FAILED;
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}
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if (entry.loc != entries[eventsCount].loc) {
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LOG("(entry#%" PRIuPTR ") wrong location: %s", eventsCount, jlong_to_string(entry.loc, buffer));
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LOG(", expected: %s\n", jlong_to_string(entries[eventsCount].loc, buffer));
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result = STATUS_FAILED;
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}
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jboolean isVirtual = jni->IsVirtualThread(thread_obj);
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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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} else {
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LOG("Unexpected method entry catched:");
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LOG(" class: \"%s\"\n", cls_sig);
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LOG(" method: \"%s%s\"\n", entry.name, entry.sig);
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LOG(" location: %s\n", jlong_to_string(entry.loc, buffer));
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result = STATUS_FAILED;
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}
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eventsCount++;
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}
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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_method_entry_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_method_entry_events) {
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callbacks.MethodEntry = &MethodEntry;
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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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} else {
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LOG("Warning: MethodEntry 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_mentry01_enable(JNIEnv *jni, jclass cls) {
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jvmtiError err;
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if (jvmti == nullptr) {
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return;
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}
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jthread thread;
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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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}
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isVirtualExpected = jni->IsVirtualThread(thread);
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_METHOD_ENTRY, nullptr);
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if (err == JVMTI_ERROR_NONE) {
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eventsExpected = sizeof(entries)/sizeof(entry_info);
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eventsCount = 0;
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} else {
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LOG("Failed to enable JVMTI_EVENT_METHOD_ENTRY event: %s (%d)\n", TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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JNIEXPORT jint JNICALL
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Java_mentry01_check(JNIEnv *jni, jclass cls) {
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jmethodID mid = jni->GetStaticMethodID(cls, "dummy", "()V");
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if (mid == nullptr) {
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LOG("Cannot find metod \"dummy()\"!\n");
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return STATUS_FAILED;
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}
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jni->CallStaticVoidMethod(cls, mid);
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if (eventsCount != eventsExpected) {
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LOG("Wrong number of MethodEntry events: %" PRIuPTR ", expected: %" PRIuPTR "\n", eventsCount, eventsExpected);
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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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JNIEXPORT void JNICALL
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Java_mentry01_chain(JNIEnv *jni, jclass cls) {
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jvmtiError err;
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if (jvmti == nullptr) {
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LOG("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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err = jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_METHOD_ENTRY, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Failed to disable JVMTI_EVENT_METHOD_ENTRY event: %s (%d)\n", TranslateError(err), err);
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result = STATUS_FAILED;
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}
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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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