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8282515: More clean up on NativeLibraries just for JNI library use

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Reviewed-by: mcimadamore
This commit is contained in:
Mandy Chung 2022-03-03 01:50:02 +00:00
parent 1485883c9e
commit 02aa7cef0a
6 changed files with 250 additions and 102 deletions
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52
src/java.base/share/classes/jdk/internal/loader/NativeLibraries.java
View file

@ -190,7 +190,7 @@ public final class NativeLibraries {
}
}
NativeLibraryImpl lib = new NativeLibraryImpl(fromClass, name, isBuiltin, true);
NativeLibraryImpl lib = new NativeLibraryImpl(fromClass, name, isBuiltin);
// load the native library
NativeLibraryContext.push(lib);
try {
@ -290,21 +290,16 @@ public final class NativeLibraries {
final String name;
// Indicates if the native library is linked into the VM
final boolean isBuiltin;
// Indicate if this is JNI native library
final boolean isJNI;
// opaque handle to native library, used in native code.
long handle;
// the version of JNI environment the native library requires.
int jniVersion;
NativeLibraryImpl(Class<?> fromClass, String name, boolean isBuiltin, boolean isJNI) {
assert !isBuiltin || isJNI : "a builtin native library must be JNI library";
NativeLibraryImpl(Class<?> fromClass, String name, boolean isBuiltin) {
this.fromClass = fromClass;
this.name = name;
this.isBuiltin = isBuiltin;
this.isJNI = isJNI;
}
@Override
@ -322,7 +317,7 @@ public final class NativeLibraries {
* when this class loader becomes phantom reachable.
*/
private Runnable unloader() {
return new Unloader(name, handle, isBuiltin, isJNI);
return new Unloader(name, handle, isBuiltin);
}
/*
@ -333,14 +328,14 @@ public final class NativeLibraries {
throw new InternalError("Native library " + name + " has been loaded");
}
return load(this, name, isBuiltin, isJNI, loadLibraryOnlyIfPresent);
return load(this, name, isBuiltin, loadLibraryOnlyIfPresent);
}
/*
* Close this native library.
*/
void close() {
unload(name, isBuiltin, isJNI, handle);
unload(name, isBuiltin, handle);
}
}
@ -352,15 +347,13 @@ public final class NativeLibraries {
// This represents the context when a native library is unloaded
// and getFromClass() will return null,
static final NativeLibraryImpl UNLOADER =
new NativeLibraryImpl(null, "dummy", false, false);
new NativeLibraryImpl(null, "dummy", false);
final String name;
final long handle;
final boolean isBuiltin;
final boolean isJNI;
Unloader(String name, long handle, boolean isBuiltin, boolean isJNI) {
assert !isBuiltin || isJNI : "a builtin native library must be JNI library";
Unloader(String name, long handle, boolean isBuiltin) {
if (handle == 0) {
throw new IllegalArgumentException(
"Invalid handle for native library " + name);
@ -369,7 +362,6 @@ public final class NativeLibraries {
this.name = name;
this.handle = handle;
this.isBuiltin = isBuiltin;
this.isJNI = isJNI;
}
@Override
@ -377,12 +369,12 @@ public final class NativeLibraries {
acquireNativeLibraryLock(name);
try {
/* remove the native library name */
if (isJNI && !loadedLibraryNames.remove(name)) {
if (!loadedLibraryNames.remove(name)) {
throw new IllegalStateException(name + " has already been unloaded");
}
NativeLibraryContext.push(UNLOADER);
try {
unload(name, isBuiltin, isJNI, handle);
unload(name, isBuiltin, handle);
} finally {
NativeLibraryContext.pop();
}
@ -524,12 +516,28 @@ public final class NativeLibraries {
return NativeLibraryContext.peek().fromClass;
}
// JNI FindClass expects the caller class if invoked from JNI_OnLoad
// and JNI_OnUnload is NativeLibrary class
/*
* Return true if the given library is successfully loaded.
* If the given library cannot be loaded for any reason,
* if throwExceptionIfFail is false, then this method returns false;
* otherwise, UnsatisfiedLinkError will be thrown.
*
* JNI FindClass expects the caller class if invoked from JNI_OnLoad
* and JNI_OnUnload is NativeLibrary class.
*/
private static native boolean load(NativeLibraryImpl impl, String name,
boolean isBuiltin, boolean isJNI,
boolean isBuiltin,
boolean throwExceptionIfFail);
private static native void unload(String name, boolean isBuiltin, boolean isJNI, long handle);
/*
* Unload the named library. JNI_OnUnload, if present, will be invoked
* before the native library is unloaded.
*/
private static native void unload(String name, boolean isBuiltin, long handle);
private static native String findBuiltinLib(String name);
private static native long findEntry0(NativeLibraryImpl lib, String name);
/*
* Returns the address of the named symbol defined in the given library.
* Returns 0 if not found.
*/
static native long findEntry0(NativeLibrary lib, String name);
}

51
src/java.base/share/classes/jdk/internal/loader/RawNativeLibraries.java
View file

@ -48,7 +48,7 @@ import static jdk.internal.loader.NativeLibraries.*;
* 3. No relationship with class loaders.
*/
public final class RawNativeLibraries {
final Map<String, NativeLibraryImpl> libraries = new ConcurrentHashMap<>();
final Map<String, RawNativeLibraryImpl> libraries = new ConcurrentHashMap<>();
final Class<?> caller;
private RawNativeLibraries(MethodHandles.Lookup trustedCaller) {
@ -116,10 +116,10 @@ public final class RawNativeLibraries {
return libraries.computeIfAbsent(pathname, this::get);
}
private NativeLibraryImpl get(String pathname) {
NativeLibraryImpl lib = new NativeLibraryImpl(caller, pathname, false, false);
private RawNativeLibraryImpl get(String pathname) {
RawNativeLibraryImpl lib = new RawNativeLibraryImpl(caller, pathname);
if (!lib.open()) {
return null; // fail to open the native library
return null;
}
return lib;
}
@ -132,8 +132,49 @@ public final class RawNativeLibraries {
if (!libraries.remove(lib.name(), lib)) {
throw new IllegalArgumentException(lib.name() + " not loaded by this RawNativeLibraries instance");
}
NativeLibraryImpl nl = (NativeLibraryImpl)lib;
RawNativeLibraryImpl nl = (RawNativeLibraryImpl)lib;
nl.close();
}
static class RawNativeLibraryImpl implements NativeLibrary {
// the name of the raw native library.
final String name;
// opaque handle to raw native library, used in native code.
long handle;
RawNativeLibraryImpl(Class<?> fromClass, String name) {
this.name = name;
}
@Override
public String name() {
return name;
}
@Override
public long find(String name) {
return findEntry0(this, name);
}
/*
* Loads the named native library.
*/
boolean open() {
if (handle != 0) {
throw new InternalError("Native library " + name + " has been loaded");
}
return load0(this, name);
}
/*
* Close this native library.
*/
void close() {
unload0(name, handle);
}
}
private static native boolean load0(RawNativeLibraryImpl impl, String name);
private static native void unload0(String name, long handle);
}

125
src/java.base/share/native/libjava/NativeLibraries.c
View file

@ -25,13 +25,13 @@
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "jni.h"
#include "jni_util.h"
#include "jlong.h"
#include "jvm.h"
#include "jdk_internal_loader_NativeLibraries.h"
#include <string.h>
typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *);
typedef void (JNICALL *JNI_OnUnload_t)(JavaVM *, void *);
@ -40,18 +40,17 @@ static jfieldID handleID;
static jfieldID jniVersionID;
static void *procHandle;
static jboolean initIDs(JNIEnv *env)
{
if (handleID == 0) {
jclass this =
jclass nlClz =
(*env)->FindClass(env, "jdk/internal/loader/NativeLibraries$NativeLibraryImpl");
if (this == 0)
if (nlClz == 0)
return JNI_FALSE;
handleID = (*env)->GetFieldID(env, this, "handle", "J");
handleID = (*env)->GetFieldID(env, nlClz, "handle", "J");
if (handleID == 0)
return JNI_FALSE;
jniVersionID = (*env)->GetFieldID(env, this, "jniVersion", "I");
jniVersionID = (*env)->GetFieldID(env, nlClz, "jniVersion", "I");
if (jniVersionID == 0)
return JNI_FALSE;
procHandle = getProcessHandle();
@ -109,12 +108,12 @@ static void *findJniFunction(JNIEnv *env, void *handle,
/*
* Class: jdk_internal_loader_NativeLibraries
* Method: load
* Signature: (Ljava/lang/String;ZZ)Z
* Signature: (Ljdk/internal/loader/NativeLibraries/NativeLibraryImpl;Ljava/lang/String;ZZ)Z
*/
JNIEXPORT jboolean JNICALL
Java_jdk_internal_loader_NativeLibraries_load
(JNIEnv *env, jobject this, jobject lib, jstring name,
jboolean isBuiltin, jboolean isJNI, jboolean throwExceptionIfFail)
(JNIEnv *env, jclass cls, jobject lib, jstring name,
jboolean isBuiltin, jboolean throwExceptionIfFail)
{
const char *cname;
jint jniVersion;
@ -129,53 +128,52 @@ Java_jdk_internal_loader_NativeLibraries_load
if (cname == 0)
return JNI_FALSE;
handle = isBuiltin ? procHandle : JVM_LoadLibrary(cname, throwExceptionIfFail);
if (isJNI) {
if (handle) {
JNI_OnLoad_t JNI_OnLoad;
JNI_OnLoad = (JNI_OnLoad_t)findJniFunction(env, handle,
isBuiltin ? cname : NULL,
JNI_TRUE);
if (JNI_OnLoad) {
JavaVM *jvm;
(*env)->GetJavaVM(env, &jvm);
jniVersion = (*JNI_OnLoad)(jvm, NULL);
} else {
jniVersion = 0x00010001;
}
cause = (*env)->ExceptionOccurred(env);
if (cause) {
(*env)->ExceptionClear(env);
(*env)->Throw(env, cause);
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
}
goto done;
}
if (!JVM_IsSupportedJNIVersion(jniVersion) ||
(isBuiltin && jniVersion < JNI_VERSION_1_8)) {
char msg[256];
jio_snprintf(msg, sizeof(msg),
"unsupported JNI version 0x%08X required by %s",
jniVersion, cname);
JNU_ThrowByName(env, "java/lang/UnsatisfiedLinkError", msg);
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
}
goto done;
}
(*env)->SetIntField(env, lib, jniVersionID, jniVersion);
if (handle) {
JNI_OnLoad_t JNI_OnLoad;
JNI_OnLoad = (JNI_OnLoad_t)findJniFunction(env, handle,
isBuiltin ? cname : NULL,
JNI_TRUE);
if (JNI_OnLoad) {
JavaVM *jvm;
(*env)->GetJavaVM(env, &jvm);
jniVersion = (*JNI_OnLoad)(jvm, NULL);
} else {
cause = (*env)->ExceptionOccurred(env);
if (cause) {
(*env)->ExceptionClear(env);
(*env)->SetLongField(env, lib, handleID, (jlong)0);
(*env)->Throw(env, cause);
jniVersion = 0x00010001;
}
cause = (*env)->ExceptionOccurred(env);
if (cause) {
(*env)->ExceptionClear(env);
(*env)->Throw(env, cause);
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
}
goto done;
}
if (!JVM_IsSupportedJNIVersion(jniVersion) ||
(isBuiltin && jniVersion < JNI_VERSION_1_8)) {
char msg[256];
jio_snprintf(msg, sizeof(msg),
"unsupported JNI version 0x%08X required by %s",
jniVersion, cname);
JNU_ThrowByName(env, "java/lang/UnsatisfiedLinkError", msg);
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
}
goto done;
}
(*env)->SetIntField(env, lib, jniVersionID, jniVersion);
} else {
cause = (*env)->ExceptionOccurred(env);
if (cause) {
(*env)->ExceptionClear(env);
(*env)->SetLongField(env, lib, handleID, (jlong)0);
(*env)->Throw(env, cause);
}
goto done;
}
(*env)->SetLongField(env, lib, handleID, ptr_to_jlong(handle));
loaded = JNI_TRUE;
@ -187,11 +185,11 @@ Java_jdk_internal_loader_NativeLibraries_load
/*
* Class: jdk_internal_loader_NativeLibraries
* Method: unload
* Signature: (Ljava/lang/String;ZZJ)V
* Signature: (Ljava/lang/String;ZJ)V
*/
JNIEXPORT void JNICALL
Java_jdk_internal_loader_NativeLibraries_unload
(JNIEnv *env, jclass cls, jstring name, jboolean isBuiltin, jboolean isJNI, jlong address)
(JNIEnv *env, jclass cls, jstring name, jboolean isBuiltin, jlong address)
{
const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
void *handle;
@ -205,15 +203,14 @@ Java_jdk_internal_loader_NativeLibraries_unload
return;
}
handle = jlong_to_ptr(address);
if (isJNI) {
JNI_OnUnload = (JNI_OnUnload_t )findJniFunction(env, handle,
isBuiltin ? cname : NULL,
JNI_FALSE);
if (JNI_OnUnload) {
JavaVM *jvm;
(*env)->GetJavaVM(env, &jvm);
(*JNI_OnUnload)(jvm, NULL);
}
JNI_OnUnload = (JNI_OnUnload_t )findJniFunction(env, handle,
isBuiltin ? cname : NULL,
JNI_FALSE);
if (JNI_OnUnload) {
JavaVM *jvm;
(*env)->GetJavaVM(env, &jvm);
(*JNI_OnUnload)(jvm, NULL);
}
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
@ -225,11 +222,11 @@ Java_jdk_internal_loader_NativeLibraries_unload
/*
* Class: jdk_internal_loader_NativeLibraries
* Method: findEntry0
* Signature: (Ljava/lang/String;)J
* Signature: (Ljdk/internal/loader/NativeLibrary;Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL
Java_jdk_internal_loader_NativeLibraries_findEntry0
(JNIEnv *env, jobject this, jobject lib, jstring name)
(JNIEnv *env, jclass cls, jobject lib, jstring name)
{
jlong handle;
const char *cname;

99
src/java.base/share/native/libjava/RawNativeLibraries.c Normal file
View file

@ -0,0 +1,99 @@
/*
* Copyright (c) 2022, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 <stdlib.h>
#include <assert.h>
#include <string.h>
#include "jni.h"
#include "jni_util.h"
#include "jlong.h"
#include "jvm.h"
#include "jdk_internal_loader_RawNativeLibraries.h"
static jfieldID handleID;
static jboolean initIDs(JNIEnv *env)
{
if (handleID == 0) {
jclass rnlClz =
(*env)->FindClass(env, "jdk/internal/loader/RawNativeLibraries$RawNativeLibraryImpl");
if (rnlClz == 0)
return JNI_FALSE;
handleID = (*env)->GetFieldID(env, rnlClz, "handle", "J");
if (handleID == 0)
return JNI_FALSE;
}
return JNI_TRUE;
}
/*
* Class: jdk_internal_loader_RawNativeLibraries
* Method: Java_jdk_internal_loader_RawNativeLibraries_load0
* Signature: (Ljdk/internal/loader/RawNativeLibraries/RawNativeLibraryImpl;Ljava/lang/String;)Z
*/
JNIEXPORT jboolean JNICALL
Java_jdk_internal_loader_RawNativeLibraries_load0
(JNIEnv *env, jclass cls, jobject lib, jstring name)
{
const char *cname;
void * handle;
if (!initIDs(env))
return JNI_FALSE;
cname = JNU_GetStringPlatformChars(env, name, 0);
if (cname == 0)
return JNI_FALSE;
handle = JVM_LoadLibrary(cname, JNI_FALSE);
(*env)->SetLongField(env, lib, handleID, ptr_to_jlong(handle));
JNU_ReleaseStringPlatformChars(env, name, cname);
return handle != 0L;
}
/*
* Class: jdk_internal_loader_RawNativeLibraries
* Method: unload0
* Signature: (Ljava/lang/String;J)V
*/
JNIEXPORT void JNICALL Java_jdk_internal_loader_RawNativeLibraries_unload0
(JNIEnv *env, jclass cls, jstring name, jlong address)
{
void *handle;
const char *cname;
if (!initIDs(env))
return;
cname = JNU_GetStringPlatformChars(env, name, 0);
if (cname == NULL) {
return;
}
handle = jlong_to_ptr(address);
JVM_UnloadLibrary(handle);
JNU_ReleaseStringPlatformChars(env, name, cname);
}