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/*
* Copyright (c) 2010, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "jvmti.h"
#include "agent_common.hpp"
#include "JVMTITools.hpp"
#include "jvmti_tools.hpp"
#include "mlvmJvmtiUtils.hpp"
extern "C" {
void copyFromJString(JNIEnv * pEnv, jstring src, char ** dst) {
const char * pStr;
jsize len;
if (!NSK_VERIFY((pStr = pEnv->GetStringUTFChars(src, nullptr)) != nullptr)) {
return;
}
len = pEnv->GetStringUTFLength(src) + 1;
*dst = (char*) malloc(len);
strncpy(*dst, pStr, len);
pEnv->ReleaseStringUTFChars(src, pStr);
}
/**
* Helper class to track JVMTI resources, deallocating the resource in the destructor.
*/
class JvmtiResource {
private:
jvmtiEnv* const _jvmtiEnv;
void* const _ptr;
public:
JvmtiResource(jvmtiEnv* jvmtiEnv, void* ptr) : _jvmtiEnv(jvmtiEnv), _ptr(ptr) { }
~JvmtiResource() {
NSK_JVMTI_VERIFY(_jvmtiEnv->Deallocate((unsigned char*)_ptr));
}
};
struct MethodName * getMethodName(jvmtiEnv * pJvmtiEnv, jmethodID method) {
char * szName;
char * szSignature;
jclass clazz;
struct MethodName * mn;
if (!NSK_JVMTI_VERIFY(pJvmtiEnv->GetMethodName(method, &szName, nullptr, nullptr))) {
return nullptr;
}
JvmtiResource szNameResource(pJvmtiEnv, szName);
if (!NSK_JVMTI_VERIFY(pJvmtiEnv->GetMethodDeclaringClass(method, &clazz))) {
return nullptr;
}
if (!NSK_JVMTI_VERIFY(pJvmtiEnv->GetClassSignature(clazz, &szSignature, nullptr))) {
return nullptr;
}
JvmtiResource szSignatureResource(pJvmtiEnv, szSignature);
if (strlen(szName) + 1 > sizeof(mn->methodName) ||
strlen(szSignature) + 1 > sizeof(mn->classSig)) {
return nullptr;
}
mn = (MethodName*) malloc(sizeof(MethodNameStruct));
if (mn == nullptr) {
return nullptr;
}
strncpy(mn->methodName, szName, sizeof(mn->methodName) - 1);
mn->methodName[sizeof(mn->methodName) - 1] = '\0';
strncpy(mn->classSig, szSignature, sizeof(mn->classSig) - 1);
mn->classSig[sizeof(mn->classSig) - 1] = '\0';
return mn;
}
char * locationToString(jvmtiEnv * pJvmtiEnv, jmethodID method, jlocation location) {
struct MethodName * pMN;
int len;
char * result;
const char * const format = "%s .%s :" JLONG_FORMAT;
pMN = getMethodName(pJvmtiEnv, method);
if (!pMN)
return strdup("NONE");
len = snprintf(nullptr, 0, format, pMN->classSig, pMN->methodName, location) + 1;
if (len <= 0) {
free(pMN);
return nullptr;
}
result = (char*) malloc(len);
if (result == nullptr) {
free(pMN);
return nullptr;
}
snprintf(result, len, format, pMN->classSig, pMN->methodName, location);
free(pMN);
return result;
}
void * getTLS(jvmtiEnv * pJvmtiEnv, jthread thread, jsize sizeToAllocate) {
void * tls;
if (!NSK_JVMTI_VERIFY(pJvmtiEnv->GetThreadLocalStorage(thread, &tls)))
return nullptr;
if (!tls) {
if (!NSK_VERIFY((tls = malloc(sizeToAllocate)) != nullptr))
return nullptr;
memset(tls, 0, sizeToAllocate);
if (!NSK_JVMTI_VERIFY(pJvmtiEnv->SetThreadLocalStorage(thread, tls)))
return nullptr;
}
return tls;
}
}
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