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8240975: Extend NativeLibraries to support explicit unloading

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Reviewed-by: alanb, mcimadamore
This commit is contained in:
Mandy Chung 2020-03-23 09:05:39 -07:00
parent b66c680885
commit 75a8b7fa83
9 changed files with 493 additions and 92 deletions
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108
src/java.base/share/native/libjava/NativeLibraries.c
View file

@ -109,11 +109,11 @@ static void *findJniFunction(JNIEnv *env, void *handle,
/*
* Class: jdk_internal_loader_NativeLibraries
* Method: load
* Signature: (Ljava/lang/String;Z)Z
* Signature: (Ljava/lang/String;ZZ)Z
*/
JNIEXPORT jboolean JNICALL
Java_jdk_internal_loader_NativeLibraries_load
(JNIEnv *env, jobject this, jobject lib, jstring name, jboolean isBuiltin)
(JNIEnv *env, jobject this, jobject lib, jstring name, jboolean isBuiltin, jboolean isJNI)
{
const char *cname;
jint jniVersion;
@ -128,50 +128,52 @@ Java_jdk_internal_loader_NativeLibraries_load
if (cname == 0)
return JNI_FALSE;
handle = isBuiltin ? procHandle : JVM_LoadLibrary(cname);
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);
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);
} else {
jniVersion = 0x00010001;
}
cause = (*env)->ExceptionOccurred(env);
if (cause) {
(*env)->ExceptionClear(env);
(*env)->Throw(env, cause);
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
cause = (*env)->ExceptionOccurred(env);
if (cause) {
(*env)->ExceptionClear(env);
(*env)->SetLongField(env, lib, handleID, (jlong)0);
(*env)->Throw(env, cause);
}
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;
@ -184,11 +186,11 @@ Java_jdk_internal_loader_NativeLibraries_load
/*
* Class: jdk_internal_loader_NativeLibraries
* Method: unload
* Signature: (Ljava/lang/String;ZJ)V
* Signature: (Ljava/lang/String;ZZJ)V
*/
JNIEXPORT void JNICALL
Java_jdk_internal_loader_NativeLibraries_unload
(JNIEnv *env, jclass cls, jstring name, jboolean isBuiltin, jlong address)
(JNIEnv *env, jclass cls, jstring name, jboolean isBuiltin, jboolean isJNI, jlong address)
{
const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
void *handle;
@ -202,13 +204,15 @@ Java_jdk_internal_loader_NativeLibraries_unload
return;
}
handle = jlong_to_ptr(address);
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 (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);
}
}
if (!isBuiltin) {
JVM_UnloadLibrary(handle);
@ -299,5 +303,3 @@ Java_jdk_internal_loader_NativeLibraries_findBuiltinLib
free(libName);
return NULL;
}