8143963: improve ClassLoader::trace_class_path to accept an additional outputStream* arg

Summary: for fixing a truncation problem on the output from -XX:+TraceClassPaths
Reviewed-by: coleenp, jiangli, cjplummer, minqi

src/share/vm/classfile/classLoader.cpp

@@ -414,30 +414,30 @@ void ClassLoader::exit_with_path_failure(const char* error, const char* message)
 }
 #endif
 
-void ClassLoader::trace_class_path(const char* msg, const char* name) {
+void ClassLoader::trace_class_path(outputStream* out, const char* msg, const char* name) {
   if (!TraceClassPaths) {
     return;
   }
 
   if (msg) {
-    tty->print("%s", msg);
+    out->print("%s", msg);
   }
   if (name) {
     if (strlen(name) < 256) {
-      tty->print("%s", name);
+      out->print("%s", name);
     } else {
       // For very long paths, we need to print each character separately,
       // as print_cr() has a length limit
       while (name[0] != '\0') {
-        tty->print("%c", name[0]);
+        out->print("%c", name[0]);
         name++;
       }
     }
   }
   if (msg && msg[0] == '[') {
-    tty->print_cr("]");
+    out->print_cr("]");
   } else {
-    tty->cr();
+    out->cr();
   }
 }
 
@@ -583,7 +583,7 @@ void ClassLoader::setup_bootstrap_search_path() {
     // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
     // the same as the bootcp of the shared archive.
   } else {
-    trace_class_path("[Bootstrap loader class path=", sys_class_path);
+    trace_class_path(tty, "[Bootstrap loader class path=", sys_class_path);
   }
 #if INCLUDE_CDS
   if (DumpSharedSpaces) {

src/share/vm/classfile/classLoader.hpp

@@ -346,7 +346,7 @@ class ClassLoader: AllStatic {
   static void  exit_with_path_failure(const char* error, const char* message);
 #endif
 
-  static void  trace_class_path(const char* msg, const char* name = NULL);
+  static void  trace_class_path(outputStream* out, const char* msg, const char* name = NULL);
 
   // VM monitoring and management support
   static jlong classloader_time_ms();

src/share/vm/classfile/sharedPathsMiscInfo.cpp

 /*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2015, 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
@@ -67,7 +67,7 @@ bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
 }
 
 bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
-  ClassLoader::trace_class_path(msg, name);
+  ClassLoader::trace_class_path(tty, msg, name);
   MetaspaceShared::set_archive_loading_failed();
   return false;
 }

src/share/vm/classfile/sharedPathsMiscInfo.hpp

 /*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2015, 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
@@ -64,7 +64,7 @@ protected:
   bool read(void* ptr, size_t size);
 
   static void trace_class_path(const char* msg, const char* name = NULL) {
-    ClassLoader::trace_class_path(msg, name);
+    ClassLoader::trace_class_path(tty, msg, name);
   }
 protected:
   static bool fail(const char* msg, const char* name = NULL);

src/share/vm/runtime/arguments.cpp

@@ -3414,7 +3414,7 @@ void Arguments::fix_appclasspath() {
   }
 
   if (!PrintSharedArchiveAndExit) {
-    ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
+    ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
   }
 }