From 83b09c8fa6050d4c950a293b2096d12dba7abf1e Mon Sep 17 00:00:00 2001
From: mchung <unknown>
Date: Wed, 25 Nov 2009 08:37:04 -0800
Subject: [PATCH] 6888880: JKernel VM to inject the sun.jkernel.DownloadManager
 as a boot classloader hook Summary: Call
 sun.jkernel.DownloadManager.setBootClassLoaderHook during the kernel VM
 initialization Reviewed-by: alanb, coleenp, acorn

---
 src/share/vm/classfile/vmSymbols.hpp |  1 +
 src/share/vm/runtime/thread.cpp      | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/share/vm/classfile/vmSymbols.hpp b/src/share/vm/classfile/vmSymbols.hpp
index bb9f3076a..fdc8786e5 100644
--- a/src/share/vm/classfile/vmSymbols.hpp
+++ b/src/share/vm/classfile/vmSymbols.hpp
@@ -104,6 +104,7 @@
   template(java_lang_AssertionStatusDirectives,       "java/lang/AssertionStatusDirectives")      \
   template(sun_jkernel_DownloadManager,               "sun/jkernel/DownloadManager")              \
   template(getBootClassPathEntryForClass_name,        "getBootClassPathEntryForClass")            \
+  template(setBootClassLoaderHook_name,               "setBootClassLoaderHook")                   \
                                                                                                   \
   /* class file format tags */                                                                    \
   template(tag_source_file,                           "SourceFile")                               \
diff --git a/src/share/vm/runtime/thread.cpp b/src/share/vm/runtime/thread.cpp
index 38e3ac438..5b2b90ded 100644
--- a/src/share/vm/runtime/thread.cpp
+++ b/src/share/vm/runtime/thread.cpp
@@ -884,6 +884,22 @@ static void call_initializeSystemClass(TRAPS) {
                                          vmSymbolHandles::void_method_signature(), CHECK);
 }
 
+#ifdef KERNEL
+static void set_jkernel_boot_classloader_hook(TRAPS) {
+  klassOop k = SystemDictionary::sun_jkernel_DownloadManager_klass();
+  instanceKlassHandle klass (THREAD, k);
+
+  if (k == NULL) {
+    // sun.jkernel.DownloadManager may not present in the JDK; just return
+    return;
+  }
+
+  JavaValue result(T_VOID);
+  JavaCalls::call_static(&result, klass, vmSymbolHandles::setBootClassLoaderHook_name(),
+                                         vmSymbolHandles::void_method_signature(), CHECK);
+}
+#endif // KERNEL
+
 static void reset_vm_info_property(TRAPS) {
   // the vm info string
   ResourceMark rm(THREAD);
@@ -3102,6 +3118,12 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
     vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
   }
 
+#ifdef KERNEL
+  if (JDK_Version::is_gte_jdk17x_version()) {
+    set_jkernel_boot_classloader_hook(THREAD);
+  }
+#endif // KERNEL
+
 #ifndef SERIALGC
   // Support for ConcurrentMarkSweep. This should be cleaned up
   // and better encapsulated. The ugly nested if test would go away
-- 
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