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8164512: Replace ClassLoader use of finalizer with phantom reference to unload native library

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Reviewed-by: alanb, bchristi, kbarrett, dholmes, plevart
This commit is contained in:
Mandy Chung 2017-11-06 17:48:00 -08:00
parent 46d230c9cc
commit 25032bad54
12 changed files with 484 additions and 163 deletions
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38
src/java.base/share/native/libjava/ClassLoader.c
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@ -260,7 +260,6 @@ Java_java_lang_ClassLoader_findLoadedClass0(JNIEnv *env, jobject loader,
static jfieldID handleID;
static jfieldID jniVersionID;
static jfieldID loadedID;
static void *procHandle;
static jboolean initIDs(JNIEnv *env)
@ -276,9 +275,6 @@ static jboolean initIDs(JNIEnv *env)
jniVersionID = (*env)->GetFieldID(env, this, "jniVersion", "I");
if (jniVersionID == 0)
return JNI_FALSE;
loadedID = (*env)->GetFieldID(env, this, "loaded", "Z");
if (loadedID == 0)
return JNI_FALSE;
procHandle = getProcessHandle();
}
return JNI_TRUE;
@ -335,30 +331,31 @@ static void *findJniFunction(JNIEnv *env, void *handle,
/*
* Class: java_lang_ClassLoader_NativeLibrary
* Method: load
* Signature: (Ljava/lang/String;Z)V
* Method: load0
* Signature: (Ljava/lang/String;Z)Z
*/
JNIEXPORT void JNICALL
Java_java_lang_ClassLoader_00024NativeLibrary_load
JNIEXPORT jboolean JNICALL
Java_java_lang_ClassLoader_00024NativeLibrary_load0
(JNIEnv *env, jobject this, jstring name, jboolean isBuiltin)
{
const char *cname;
jint jniVersion;
jthrowable cause;
void * handle;
jboolean loaded = JNI_FALSE;
if (!initIDs(env))
return;
return JNI_FALSE;
cname = JNU_GetStringPlatformChars(env, name, 0);
if (cname == 0)
return;
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);
isBuiltin ? cname : NULL,
JNI_TRUE);
if (JNI_OnLoad) {
JavaVM *jvm;
(*env)->GetJavaVM(env, &jvm);
@ -400,20 +397,21 @@ Java_java_lang_ClassLoader_00024NativeLibrary_load
goto done;
}
(*env)->SetLongField(env, this, handleID, ptr_to_jlong(handle));
(*env)->SetBooleanField(env, this, loadedID, JNI_TRUE);
loaded = JNI_TRUE;
done:
JNU_ReleaseStringPlatformChars(env, name, cname);
return loaded;
}
/*
* Class: java_lang_ClassLoader_NativeLibrary
* Method: unload
* Signature: (Z)V
* Signature: (Ljava/lang/String;ZJ)V
*/
JNIEXPORT void JNICALL
Java_java_lang_ClassLoader_00024NativeLibrary_unload
(JNIEnv *env, jobject this, jstring name, jboolean isBuiltin)
(JNIEnv *env, jclass cls, jstring name, jboolean isBuiltin, jlong address)
{
const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
void *handle;
@ -426,10 +424,10 @@ Java_java_lang_ClassLoader_00024NativeLibrary_unload
if (cname == NULL) {
return;
}
handle = jlong_to_ptr((*env)->GetLongField(env, this, handleID));
handle = jlong_to_ptr(address);
JNI_OnUnload = (JNI_OnUnload_t )findJniFunction(env, handle,
isBuiltin ? cname : NULL,
JNI_FALSE);
isBuiltin ? cname : NULL,
JNI_FALSE);
if (JNI_OnUnload) {
JavaVM *jvm;
(*env)->GetJavaVM(env, &jvm);
@ -443,11 +441,11 @@ Java_java_lang_ClassLoader_00024NativeLibrary_unload
/*
* Class: java_lang_ClassLoader_NativeLibrary
* Method: find
* Method: findEntry
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL
Java_java_lang_ClassLoader_00024NativeLibrary_find
Java_java_lang_ClassLoader_00024NativeLibrary_findEntry
(JNIEnv *env, jobject this, jstring name)
{
jlong handle;