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115 lines
4.0 KiB
C++
115 lines
4.0 KiB
C++
/*
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* Copyright Amazon.com Inc. 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 <inttypes.h>
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#include <jvmti.h>
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#include <stdio.h>
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#include <string.h>
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/**
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* Callback for COMPILED_METHOD_LOAD event.
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*/
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JNIEXPORT void JNICALL
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callbackCompiledMethodLoad(jvmtiEnv* jvmti, jmethodID method,
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jint code_size, const void* code_addr,
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jint map_length, const jvmtiAddrLocationMap* map,
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const void* compile_info) {
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char* name = nullptr;
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char* sig = nullptr;
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if (jvmti->GetMethodName(method, &name, &sig, nullptr) != JVMTI_ERROR_NONE) {
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printf(" [Could not retrieve method name]\n");
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fflush(stdout);
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return;
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}
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printf("<COMPILED_METHOD_LOAD>: name: %s, code: 0x%016" PRIxPTR "\n",
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name, (uintptr_t)code_addr);
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fflush(stdout);
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}
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/**
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* Callback for COMPILED_METHOD_UNLOAD event.
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*/
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JNIEXPORT void JNICALL
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callbackCompiledMethodUnload(jvmtiEnv* jvmti, jmethodID method,
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const void* code_addr) {
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char* name = nullptr;
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char* sig = nullptr;
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if (jvmti->GetMethodName(method, &name, &sig, nullptr) != JVMTI_ERROR_NONE) {
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printf(" [Could not retrieve method name]\n");
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fflush(stdout);
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return;
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}
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printf("<COMPILED_METHOD_UNLOAD>: name: %s, code: 0x%016" PRIxPTR "\n",
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name, (uintptr_t)code_addr);
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fflush(stdout);
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}
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JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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jvmtiEnv* jvmti = nullptr;
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jvmtiError error;
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if (jvm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_0) != JNI_OK) {
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printf("Unable to access JVMTI!\n");
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return JNI_ERR;
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}
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// Add required capabilities
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jvmtiCapabilities caps;
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memset(&caps, 0, sizeof(caps));
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caps.can_generate_compiled_method_load_events = 1;
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error = jvmti->AddCapabilities(&caps);
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if (error != JVMTI_ERROR_NONE) {
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printf("ERROR: Unable to add capabilities, error=%d\n", error);
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return JNI_ERR;
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}
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// Set event callbacks
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jvmtiEventCallbacks eventCallbacks;
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memset(&eventCallbacks, 0, sizeof(eventCallbacks));
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eventCallbacks.CompiledMethodLoad = callbackCompiledMethodLoad;
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eventCallbacks.CompiledMethodUnload = callbackCompiledMethodUnload;
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error = jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks));
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if (error != JVMTI_ERROR_NONE) {
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printf("ERROR: Unable to set event callbacks, error=%d\n", error);
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return JNI_ERR;
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}
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// Enable events
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error = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_COMPILED_METHOD_LOAD, nullptr);
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if (error != JVMTI_ERROR_NONE) {
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printf("ERROR: Unable to enable COMPILED_METHOD_LOAD event, error=%d\n", error);
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return JNI_ERR;
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}
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error = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_COMPILED_METHOD_UNLOAD, nullptr);
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if (error != JVMTI_ERROR_NONE) {
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printf("ERROR: Unable to enable COMPILED_METHOD_UNLOAD event, error=%d\n", error);
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return JNI_ERR;
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}
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return JNI_OK;
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}
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