6994753: Implement optional hook to a Java method at VM startup.

Reviewed-by: mchung, acorn

src/share/vm/classfile/systemDictionary.hpp

 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -172,6 +172,8 @@ class SymbolPropertyTable;
                                                                               \
   template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
                                                                               \
+  template(sun_misc_PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt)       \
+                                                                              \
   /* Preload boxing klasses */                                                \
   template(Boolean_klass,                java_lang_Boolean,              Pre) \
   template(Character_klass,              java_lang_Character,            Pre) \

src/share/vm/classfile/vmSymbols.hpp

 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -111,6 +111,7 @@
   template(sun_jkernel_DownloadManager,               "sun/jkernel/DownloadManager")              \
   template(getBootClassPathEntryForClass_name,        "getBootClassPathEntryForClass")            \
   template(setBootClassLoaderHook_name,               "setBootClassLoaderHook")                   \
+  template(sun_misc_PostVMInitHook,                   "sun/misc/PostVMInitHook")                  \
                                                                                                   \
   /* class file format tags */                                                                    \
   template(tag_source_file,                           "SourceFile")                               \

src/share/vm/prims/jvm.h

 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -1649,7 +1649,8 @@ typedef struct {
      * the new bit is also added in the main/baseline.
      */
     unsigned int thread_park_blocker : 1;
-    unsigned int : 31;
+    unsigned int post_vm_init_hook_enabled : 1;
+    unsigned int : 30;
     unsigned int : 32;
     unsigned int : 32;
 } jdk_version_info;

src/share/vm/runtime/arguments.cpp

 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -918,9 +918,7 @@ bool Arguments::add_property(const char* prop) {
   } else if (strcmp(key, "sun.java.command") == 0) {
     _java_command = value;
 
-    // don't add this property to the properties exposed to the java application
-    FreeHeap(key);
-    return true;
+    // Record value in Arguments, but let it get passed to Java.
   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
     // launcher.pid property is private and is processed
     // in process_sun_java_launcher_properties();

src/share/vm/runtime/java.cpp

 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -663,7 +663,8 @@ void JDK_Version::initialize() {
     }
     _current = JDK_Version(major, minor, micro, info.update_version,
                            info.special_update_version, build,
-                           info.thread_park_blocker == 1);
+                           info.thread_park_blocker == 1,
+                           info.post_vm_init_hook_enabled == 1);
   }
 }
 

src/share/vm/runtime/java.hpp

 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, 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
@@ -92,6 +92,7 @@ class JDK_Version VALUE_OBJ_CLASS_SPEC {
   bool _partially_initialized;
 
   bool _thread_park_blocker;
+  bool _post_vm_init_hook_enabled;
 
   bool is_valid() const {
     return (_major != 0 || _partially_initialized);
@@ -113,14 +114,15 @@ class JDK_Version VALUE_OBJ_CLASS_SPEC {
 
   JDK_Version() : _major(0), _minor(0), _micro(0), _update(0),
                   _special(0), _build(0), _partially_initialized(false),
-                  _thread_park_blocker(false) {}
+                  _thread_park_blocker(false), _post_vm_init_hook_enabled(false) {}
 
   JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0,
               uint8_t update = 0, uint8_t special = 0, uint8_t build = 0,
-              bool thread_park_blocker = false) :
+              bool thread_park_blocker = false, bool post_vm_init_hook_enabled = false) :
       _major(major), _minor(minor), _micro(micro), _update(update),
       _special(special), _build(build), _partially_initialized(false),
-      _thread_park_blocker(thread_park_blocker) {}
+      _thread_park_blocker(thread_park_blocker),
+      _post_vm_init_hook_enabled(post_vm_init_hook_enabled) {}
 
   // Returns the current running JDK version
   static JDK_Version current() { return _current; }
@@ -144,6 +146,9 @@ class JDK_Version VALUE_OBJ_CLASS_SPEC {
   bool supports_thread_park_blocker() const {
     return _thread_park_blocker;
   }
+  bool post_vm_init_hook_enabled() const {
+    return _post_vm_init_hook_enabled;
+  }
 
   // Performs a full ordering comparison using all fields (update, build, etc.)
   int compare(const JDK_Version& other) const;

src/share/vm/runtime/thread.cpp

@@ -978,6 +978,19 @@ static void set_jkernel_boot_classloader_hook(TRAPS) {
 }
 #endif // KERNEL
 
+// General purpose hook into Java code, run once when the VM is initialized.
+// The Java library method itself may be changed independently from the VM.
+static void call_postVMInitHook(TRAPS) {
+  klassOop k = SystemDictionary::sun_misc_PostVMInitHook_klass();
+  instanceKlassHandle klass (THREAD, k);
+  if (klass.not_null()) {
+    JavaValue result(T_VOID);
+    JavaCalls::call_static(&result, klass, vmSymbolHandles::run_method_name(),
+                                           vmSymbolHandles::void_method_signature(),
+                                           CHECK);
+  }
+}
+
 static void reset_vm_info_property(TRAPS) {
   // the vm info string
   ResourceMark rm(THREAD);
@@ -3346,6 +3359,14 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
 
   BiasedLocking::init();
 
+  if (JDK_Version::current().post_vm_init_hook_enabled()) {
+    call_postVMInitHook(THREAD);
+    // The Java side of PostVMInitHook.run must deal with all
+    // exceptions and provide means of diagnosis.
+    if (HAS_PENDING_EXCEPTION) {
+      CLEAR_PENDING_EXCEPTION;
+    }
+  }
 
   // Start up the WatcherThread if there are any periodic tasks
   // NOTE:  All PeriodicTasks should be registered by now. If they