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dragonwell8_hotspot
提交 af8d5cb8 编写于 作者: C coleenp
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上级 1d896fc1 3718cd57
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Showing with 549 addition and 72 deletion
agent/src/os/bsd/ps_core.c
浏览文件 @ af8d5cb8
......@@ -199,10 +199,10 @@ static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr)
//---------------------------------------------------------------
// Part of the class sharing workaround:
//
// With class sharing, pages are mapped from classes[_g].jsa file.
// With class sharing, pages are mapped from classes.jsa file.
// The read-only class sharing pages are mapped as MAP_SHARED,
// PROT_READ pages. These pages are not dumped into core dump.
// With this workaround, these pages are read from classes[_g].jsa.
// With this workaround, these pages are read from classes.jsa.
// FIXME: !HACK ALERT!
// The format of sharing achive file header is needed to read shared heap
......@@ -298,14 +298,12 @@ static bool init_classsharing_workaround(struct ps_prochandle* ph) {
lib_info* lib = ph->libs;
while (lib != NULL) {
// we are iterating over shared objects from the core dump. look for
// libjvm[_g].so.
// libjvm.so.
const char *jvm_name = 0;
#ifdef __APPLE__
if ((jvm_name = strstr(lib->name, "/libjvm.dylib")) != 0 ||
(jvm_name = strstr(lib->name, "/libjvm_g.dylib")) != 0)
if ((jvm_name = strstr(lib->name, "/libjvm.dylib")) != 0)
#else
if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0 ||
(jvm_name = strstr(lib->name, "/libjvm_g.so")) != 0)
if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0)
#endif // __APPLE__
{
char classes_jsa[PATH_MAX];
......@@ -389,7 +387,7 @@ static bool init_classsharing_workaround(struct ps_prochandle* ph) {
}
ph->core->classes_jsa_fd = fd;
// add read-only maps from classes[_g].jsa to the list of maps
// add read-only maps from classes.jsa to the list of maps
for (m = 0; m < NUM_SHARED_MAPS; m++) {
if (header._space[m]._read_only) {
base = (uintptr_t) header._space[m]._base;
......
agent/src/os/linux/ps_core.c
浏览文件 @ af8d5cb8
......@@ -195,10 +195,10 @@ static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr)
//---------------------------------------------------------------
// Part of the class sharing workaround:
//
// With class sharing, pages are mapped from classes[_g].jsa file.
// With class sharing, pages are mapped from classes.jsa file.
// The read-only class sharing pages are mapped as MAP_SHARED,
// PROT_READ pages. These pages are not dumped into core dump.
// With this workaround, these pages are read from classes[_g].jsa.
// With this workaround, these pages are read from classes.jsa.
// FIXME: !HACK ALERT!
// The format of sharing achive file header is needed to read shared heap
......@@ -284,10 +284,9 @@ static bool init_classsharing_workaround(struct ps_prochandle* ph) {
lib_info* lib = ph->libs;
while (lib != NULL) {
// we are iterating over shared objects from the core dump. look for
// libjvm[_g].so.
// libjvm.so.
const char *jvm_name = 0;
if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0 ||
(jvm_name = strstr(lib->name, "/libjvm_g.so")) != 0) {
if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0) {
char classes_jsa[PATH_MAX];
struct FileMapHeader header;
size_t n = 0;
......@@ -371,7 +370,7 @@ static bool init_classsharing_workaround(struct ps_prochandle* ph) {
}
ph->core->classes_jsa_fd = fd;
// add read-only maps from classes[_g].jsa to the list of maps
// add read-only maps from classes.jsa to the list of maps
for (m = 0; m < NUM_SHARED_MAPS; m++) {
if (header._space[m]._read_only) {
base = (uintptr_t) header._space[m]._base;
......
agent/src/os/solaris/proc/saproc.cpp
浏览文件 @ af8d5cb8
......@@ -589,8 +589,7 @@ init_classsharing_workaround(void *cd, const prmap_t* pmap, const char* obj_name
JNIEnv* env = dbg->env;
jobject this_obj = dbg->this_obj;
const char* jvm_name = 0;
if ((jvm_name = strstr(obj_name, "libjvm.so")) != NULL ||
(jvm_name = strstr(obj_name, "libjvm_g.so")) != NULL) {
if ((jvm_name = strstr(obj_name, "libjvm.so")) != NULL) {
jvm_name = obj_name;
} else {
return 0;
......@@ -598,7 +597,7 @@ init_classsharing_workaround(void *cd, const prmap_t* pmap, const char* obj_name
struct ps_prochandle* ph = (struct ps_prochandle*) env->GetLongField(this_obj, p_ps_prochandle_ID);
// initialize classes[_g].jsa file descriptor field.
// initialize classes.jsa file descriptor field.
dbg->env->SetIntField(this_obj, classes_jsa_fd_ID, -1);
// check whether class sharing is on by reading variable "UseSharedSpaces"
......@@ -641,7 +640,7 @@ init_classsharing_workaround(void *cd, const prmap_t* pmap, const char* obj_name
print_debug("looking for %s\n", classes_jsa);
// open the classes[_g].jsa
// open the classes.jsa
int fd = libsaproc_open(classes_jsa, O_RDONLY);
if (fd < 0) {
char errMsg[ERR_MSG_SIZE];
......@@ -651,7 +650,7 @@ init_classsharing_workaround(void *cd, const prmap_t* pmap, const char* obj_name
print_debug("opened shared archive file %s\n", classes_jsa);
}
// parse classes[_g].jsa
// parse classes.jsa
struct FileMapHeader* pheader = (struct FileMapHeader*) malloc(sizeof(struct FileMapHeader));
if (pheader == NULL) {
close(fd);
......@@ -798,8 +797,8 @@ static void attach_internal(JNIEnv* env, jobject this_obj, jstring cmdLine, jboo
if (! isProcess) {
/*
* With class sharing, shared perm. gen heap is allocated in with MAP_SHARED|PROT_READ.
* These pages are mapped from the file "classes[_g].jsa". MAP_SHARED pages are not dumped
* in Solaris core.To read shared heap pages, we have to read classes[_g].jsa file.
* These pages are mapped from the file "classes.jsa". MAP_SHARED pages are not dumped
* in Solaris core.To read shared heap pages, we have to read classes.jsa file.
*/
Pobject_iter(ph, init_classsharing_workaround, &dbg);
exception = env->ExceptionOccurred();
......
agent/src/share/classes/sun/jvm/hotspot/HotSpotAgent.java
浏览文件 @ af8d5cb8
......@@ -24,20 +24,29 @@
package sun.jvm.hotspot;
import java.io.PrintStream;
import java.net.*;
import java.rmi.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.bsd.*;
import sun.jvm.hotspot.debugger.proc.*;
import sun.jvm.hotspot.debugger.remote.*;
import sun.jvm.hotspot.debugger.windbg.*;
import sun.jvm.hotspot.debugger.linux.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;
import java.rmi.RemoteException;
import sun.jvm.hotspot.debugger.Debugger;
import sun.jvm.hotspot.debugger.DebuggerException;
import sun.jvm.hotspot.debugger.JVMDebugger;
import sun.jvm.hotspot.debugger.MachineDescription;
import sun.jvm.hotspot.debugger.MachineDescriptionAMD64;
import sun.jvm.hotspot.debugger.MachineDescriptionIA64;
import sun.jvm.hotspot.debugger.MachineDescriptionIntelX86;
import sun.jvm.hotspot.debugger.MachineDescriptionSPARC32Bit;
import sun.jvm.hotspot.debugger.MachineDescriptionSPARC64Bit;
import sun.jvm.hotspot.debugger.NoSuchSymbolException;
import sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal;
import sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal;
import sun.jvm.hotspot.debugger.proc.ProcDebuggerLocal;
import sun.jvm.hotspot.debugger.remote.RemoteDebugger;
import sun.jvm.hotspot.debugger.remote.RemoteDebuggerClient;
import sun.jvm.hotspot.debugger.remote.RemoteDebuggerServer;
import sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.types.TypeDataBase;
import sun.jvm.hotspot.utilities.PlatformInfo;
import sun.jvm.hotspot.utilities.UnsupportedPlatformException;
/** <P> This class wraps much of the basic functionality and is the
* highest-level factory for VM data structures. It makes it simple
......@@ -475,7 +484,7 @@ public class HotSpotAgent {
}
private void setupJVMLibNamesSolaris() {
jvmLibNames = new String[] { "libjvm.so", "libjvm_g.so", "gamma_g" };
jvmLibNames = new String[] { "libjvm.so" };
}
//
......@@ -507,7 +516,7 @@ public class HotSpotAgent {
}
private void setupJVMLibNamesWin32() {
jvmLibNames = new String[] { "jvm.dll", "jvm_g.dll" };
jvmLibNames = new String[] { "jvm.dll" };
}
//
......@@ -547,7 +556,7 @@ public class HotSpotAgent {
}
private void setupJVMLibNamesLinux() {
jvmLibNames = new String[] { "libjvm.so", "libjvm_g.so" };
jvmLibNames = new String[] { "libjvm.so" };
}
//
......@@ -572,7 +581,7 @@ public class HotSpotAgent {
}
private void setupJVMLibNamesBsd() {
jvmLibNames = new String[] { "libjvm.so", "libjvm_g.so" };
jvmLibNames = new String[] { "libjvm.so" };
}
//
......@@ -595,7 +604,7 @@ public class HotSpotAgent {
}
private void setupJVMLibNamesDarwin() {
jvmLibNames = new String[] { "libjvm.dylib", "libjvm_g.dylib" };
jvmLibNames = new String[] { "libjvm.dylib" };
}
/** Convenience routine which should be called by per-platform
......
agent/src/share/classes/sun/jvm/hotspot/LinuxVtblAccess.java
浏览文件 @ af8d5cb8
......@@ -24,9 +24,9 @@
package sun.jvm.hotspot;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.types.basic.*;
import sun.jvm.hotspot.debugger.SymbolLookup;
import sun.jvm.hotspot.types.Type;
import sun.jvm.hotspot.types.basic.BasicVtblAccess;
public class LinuxVtblAccess extends BasicVtblAccess {
private String vt;
......@@ -35,8 +35,7 @@ public class LinuxVtblAccess extends BasicVtblAccess {
String[] dllNames) {
super(symbolLookup, dllNames);
if (symbolLookup.lookup("libjvm.so", "__vt_10JavaThread") != null ||
symbolLookup.lookup("libjvm_g.so", "__vt_10JavaThread") != null) {
if (symbolLookup.lookup("libjvm.so", "__vt_10JavaThread") != null) {
// old C++ ABI
vt = "__vt_";
} else {
......
agent/src/share/classes/sun/jvm/hotspot/debugger/bsd/BsdDebuggerLocal.java
浏览文件 @ af8d5cb8
......@@ -24,17 +24,28 @@
package sun.jvm.hotspot.debugger.bsd;
import java.io.*;
import java.net.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.x86.*;
import sun.jvm.hotspot.debugger.cdbg.*;
import sun.jvm.hotspot.utilities.*;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.runtime.Threads;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.debugger.DebuggerBase;
import sun.jvm.hotspot.debugger.DebuggerException;
import sun.jvm.hotspot.debugger.DebuggerUtilities;
import sun.jvm.hotspot.debugger.MachineDescription;
import sun.jvm.hotspot.debugger.NotInHeapException;
import sun.jvm.hotspot.debugger.OopHandle;
import sun.jvm.hotspot.debugger.ReadResult;
import sun.jvm.hotspot.debugger.ThreadProxy;
import sun.jvm.hotspot.debugger.UnalignedAddressException;
import sun.jvm.hotspot.debugger.UnmappedAddressException;
import sun.jvm.hotspot.debugger.cdbg.CDebugger;
import sun.jvm.hotspot.debugger.cdbg.ClosestSymbol;
import sun.jvm.hotspot.debugger.cdbg.LoadObject;
import sun.jvm.hotspot.runtime.JavaThread;
import java.lang.reflect.*;
import sun.jvm.hotspot.runtime.Threads;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.utilities.PlatformInfo;
/** <P> An implementation of the JVMDebugger interface. The basic debug
facilities are implemented through ptrace interface in the JNI code
......@@ -246,10 +257,8 @@ public class BsdDebuggerLocal extends DebuggerBase implements BsdDebugger {
/* called from attach methods */
private void findABIVersion() throws DebuggerException {
String libjvmName = isDarwin ? "libjvm.dylib" : "libjvm.so";
String libjvm_gName = isDarwin? "libjvm_g.dylib" : "libjvm_g.so";
String javaThreadVt = isDarwin ? "_vt_10JavaThread" : "__vt_10JavaThread";
if (lookupByName0(libjvmName, javaThreadVt) != 0 ||
lookupByName0(libjvm_gName, javaThreadVt) != 0) {
if (lookupByName0(libjvmName, javaThreadVt) != 0) {
// old C++ ABI
useGCC32ABI = false;
} else {
......
agent/src/share/classes/sun/jvm/hotspot/debugger/linux/LinuxDebuggerLocal.java
浏览文件 @ af8d5cb8
......@@ -24,14 +24,25 @@
package sun.jvm.hotspot.debugger.linux;
import java.io.*;
import java.net.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.x86.*;
import sun.jvm.hotspot.debugger.cdbg.*;
import sun.jvm.hotspot.utilities.*;
import java.lang.reflect.*;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.debugger.DebuggerBase;
import sun.jvm.hotspot.debugger.DebuggerException;
import sun.jvm.hotspot.debugger.DebuggerUtilities;
import sun.jvm.hotspot.debugger.MachineDescription;
import sun.jvm.hotspot.debugger.NotInHeapException;
import sun.jvm.hotspot.debugger.OopHandle;
import sun.jvm.hotspot.debugger.ReadResult;
import sun.jvm.hotspot.debugger.ThreadProxy;
import sun.jvm.hotspot.debugger.UnalignedAddressException;
import sun.jvm.hotspot.debugger.UnmappedAddressException;
import sun.jvm.hotspot.debugger.cdbg.CDebugger;
import sun.jvm.hotspot.debugger.cdbg.ClosestSymbol;
import sun.jvm.hotspot.debugger.cdbg.LoadObject;
import sun.jvm.hotspot.utilities.PlatformInfo;
/** <P> An implementation of the JVMDebugger interface. The basic debug
facilities are implemented through ptrace interface in the JNI code
......@@ -238,8 +249,7 @@ public class LinuxDebuggerLocal extends DebuggerBase implements LinuxDebugger {
/* called from attach methods */
private void findABIVersion() throws DebuggerException {
if (lookupByName0("libjvm.so", "__vt_10JavaThread") != 0 ||
lookupByName0("libjvm_g.so", "__vt_10JavaThread") != 0) {
if (lookupByName0("libjvm.so", "__vt_10JavaThread") != 0) {
// old C++ ABI
useGCC32ABI = false;
} else {
......
src/share/vm/prims/jvmtiClassFileReconstituter.cpp
浏览文件 @ af8d5cb8
......@@ -350,13 +350,13 @@ void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_n
// u2 bootstrap_arguments[num_bootstrap_arguments];
// } bootstrap_methods[num_bootstrap_methods];
// }
void JvmtiClassFileReconstituter::write_boostrapmethod_attribute() {
void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {
Array<u2>* operands = cpool()->operands();
write_attribute_name_index("BootstrapMethods");
int num_bootstrap_methods = ConstantPool::operand_array_length(operands);
// calculate length of attribute
int length = sizeof(u2); // num_boostrap_methods
int length = sizeof(u2); // num_bootstrap_methods
for (int n = 0; n < num_bootstrap_methods; n++) {
u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);
length += sizeof(u2); // bootstrap_method_ref
......@@ -657,7 +657,7 @@ void JvmtiClassFileReconstituter::write_class_attributes() {
write_annotations_attribute("RuntimeVisibleAnnotations", anno);
}
if (cpool()->operands() != NULL) {
write_boostrapmethod_attribute();
write_bootstrapmethod_attribute();
}
}
......
src/share/vm/prims/jvmtiClassFileReconstituter.hpp
浏览文件 @ af8d5cb8
......@@ -127,7 +127,7 @@ class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter {
void write_signature_attribute(u2 generic_signaure_index);
void write_attribute_name_index(const char* name);
void write_annotations_attribute(const char* attr_name, AnnotationArray* annos);
void write_boostrapmethod_attribute();
void write_bootstrapmethod_attribute();
address writeable_address(size_t size);
void write_u1(u1 x);
......
test/runtime/ClassUnload/KeepAliveClass.java 0 → 100644
浏览文件 @ af8d5cb8
/*
* Copyright (c) 2013, 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.
*/
/*
* @test KeepAliveClass
* @summary This test case uses a java.lang.Class instance to keep a class alive.
* @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
* @library classes
* @build KeepAliveClass test.Empty
* @build ClassUnloadCommon
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClass
*/
import java.lang.ref.SoftReference;
import sun.hotspot.WhiteBox;
/**
* Test that verifies that classes are not unloaded when specific types of references are kept to them.
*/
public class KeepAliveClass {
private static final String className = "test.Empty";
private static final WhiteBox wb = WhiteBox.getWhiteBox();
public static Object escape = null;
public static void main(String... args) throws Exception {
ClassLoader cl = ClassUnloadCommon.newClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
o = null; cl = null;
escape = c;
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClass (1) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClass (2) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
c = null;
escape = null;
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClass (3) alive: " + isAlive);
ClassUnloadCommon.failIf(isAlive, "should be unloaded");
}
}
}
test/runtime/ClassUnload/KeepAliveClassLoader.java 0 → 100644
浏览文件 @ af8d5cb8
/*
* Copyright (c) 2013, 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.
*/
/*
* @test KeepAliveClassLoader
* @summary This test case uses a java.lang.ClassLoader instance to keep a class alive.
* @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
* @library classes
* @build KeepAliveClassLoader test.Empty
* @build ClassUnloadCommon
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClassLoader
*/
import sun.hotspot.WhiteBox;
/**
* Test that verifies that classes are not unloaded when specific types of references are kept to them.
*/
public class KeepAliveClassLoader {
private static final String className = "test.Empty";
private static final WhiteBox wb = WhiteBox.getWhiteBox();
public static Object escape = null;
public static void main(String... args) throws Exception {
ClassLoader cl = ClassUnloadCommon.newClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
o = null; c = null;
escape = cl;
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClassLoader (1) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClassLoader (2) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
cl = null;
escape = null;
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClassLoader (3) alive: " + isAlive);
ClassUnloadCommon.failIf(isAlive, "should be unloaded");
}
}
}
test/runtime/ClassUnload/KeepAliveObject.java 0 → 100644
浏览文件 @ af8d5cb8
/*
* Copyright (c) 2013, 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.
*/
/*
* @test KeepAliveObject
* @summary This test case uses a class instance to keep the class alive.
* @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
* @library classes
* @build KeepAliveObject test.Empty
* @build ClassUnloadCommon
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveObject
*/
import sun.hotspot.WhiteBox;
/**
* Test that verifies that classes are not unloaded when specific types of references are kept to them.
*/
public class KeepAliveObject {
private static final String className = "test.Empty";
private static final WhiteBox wb = WhiteBox.getWhiteBox();
public static Object escape = null;
public static void main(String... args) throws Exception {
ClassLoader cl = ClassUnloadCommon.newClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
cl = null; c = null;
escape = o;
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testObject (1) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testObject (2) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
o = null;
escape = null;
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testObject (3) alive: " + isAlive);
ClassUnloadCommon.failIf(isAlive, "should be unloaded");
}
}
}
test/runtime/ClassUnload/KeepAliveSoftReference.java 0 → 100644
浏览文件 @ af8d5cb8
/*
* Copyright (c) 2013, 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.
*/
/*
* @test KeepAliveSoftReference
* @summary This test case uses a java.lang.ref.SoftReference referencing a class instance to keep a class alive.
* @library /testlibrary /testlibrary/whitebox /runtime/testlibrary
* @library classes
* @build KeepAliveSoftReference test.Empty
* @build ClassUnloadCommon
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveSoftReference
*/
import java.lang.ref.SoftReference;
import sun.hotspot.WhiteBox;
/**
* Test that verifies that classes are not unloaded when specific types of references are kept to them.
*/
public class KeepAliveSoftReference {
private static final String className = "test.Empty";
private static final WhiteBox wb = WhiteBox.getWhiteBox();
public static void main(String... args) throws Exception {
ClassLoader cl = ClassUnloadCommon.newClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
SoftReference<Object> sr = new SoftReference(o);
o = null; c = null; cl = null;
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testSoftReference (1) alive: " + isAlive);
boolean cleared = (sr.get() == null);
boolean shouldBeAlive = !cleared;
ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive);
}
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testSoftReference (2) alive: " + isAlive);
boolean cleared = (sr.get() == null);
boolean shouldBeAlive = !cleared;
ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive);
}
sr.clear();
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testSoftReference (3) alive: " + isAlive);
boolean cleared = (sr.get() == null);
boolean shouldBeAlive = !cleared;
ClassUnloadCommon.failIf(isAlive != shouldBeAlive, "" + isAlive + " != " + shouldBeAlive);
}
}
}
test/runtime/ClassUnload/UnloadTest.java 0 → 100644
浏览文件 @ af8d5cb8
/*
* Copyright (c) 2013, 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.
*/
/*
* @test UnloadTest
* @library /runtime/testlibrary /testlibrary /testlibrary/whitebox
* @library classes
* @build ClassUnloadCommon test.Empty
* @build UnloadTest
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI UnloadTest
*/
import sun.hotspot.WhiteBox;
/**
* Test that verifies that classes are unloaded when they are no longer reachable.
*
* The test creates a class loader, uses the loader to load a class and creates an instance
* of that class. The it nulls out all the references to the instance, class and class loader
* and tries to trigger class unloading. Then it verifies that the class is no longer
* loaded by the VM.
*/
public class UnloadTest {
private static String className = "test.Empty";
public static void main(String... args) throws Exception {
run();
}
private static void run() throws Exception {
final WhiteBox wb = WhiteBox.getWhiteBox();
ClassUnloadCommon.failIf(wb.isClassAlive(className), "is not expected to be alive yet");
ClassLoader cl = ClassUnloadCommon.newClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
ClassUnloadCommon.failIf(!wb.isClassAlive(className), "should be live here");
cl = null; c = null; o = null;
ClassUnloadCommon.triggerUnloading();
ClassUnloadCommon.failIf(wb.isClassAlive(className), "should have been unloaded");
}
}
test/runtime/ClassUnload/classes/test/Empty.java 0 → 100644
浏览文件 @ af8d5cb8
package test;
public class Empty {
public String toString() { return "nothing"; }
}
test/runtime/testlibrary/ClassUnloadCommon.java 0 → 100644
浏览文件 @ af8d5cb8
/*
* Copyright (c) 2013, 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.
*/
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Paths;
import java.util.ArrayList;
public class ClassUnloadCommon {
public static class TestFailure extends RuntimeException {
TestFailure(String msg) {
super(msg);
}
}
public static void failIf(boolean value, String msg) {
if (value) throw new TestFailure("Test failed: " + msg);
}
private static volatile Object dummy = null;
private static void allocateMemory(int kilobytes) {
ArrayList<byte[]> l = new ArrayList<>();
dummy = l;
for (int i = kilobytes; i > 0; i -= 1) {
l.add(new byte[1024]);
}
l = null;
dummy = null;
}
public static void triggerUnloading() {
allocateMemory(16 * 1024); // yg size is 8m with cms, force young collection
System.gc();
}
public static ClassLoader newClassLoader() {
try {
return new URLClassLoader(new URL[] {
Paths.get(System.getProperty("test.classes",".") + File.separatorChar + "classes").toUri().toURL(),
}, null);
} catch (MalformedURLException e){
throw new RuntimeException("Unexpected URL conversion failure", e);
}
}
}
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