8150103: Convert TraceClassPaths to Unified Logging

TraceClassPaths has been reimplemented with Unified Logging

Reviewed-by: coleenp, dholmes, iklam

hotspot/src/share/vm/classfile/classLoader.cpp

@@ -37,6 +37,7 @@
 #include "gc/shared/generation.hpp"
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/oopMapCache.hpp"
+#include "logging/logTag.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/filemap.hpp"
 #include "memory/oopFactory.hpp"
@@ -417,34 +418,30 @@ bool ClassPathImageEntry::is_jrt() {
 #if INCLUDE_CDS
 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
   assert(DumpSharedSpaces, "only called at dump time");
-  tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
+  tty->print_cr("Hint: enable -Xlog:classpath=info to diagnose the failure");
   vm_exit_during_initialization(error, message);
 }
 #endif
 
-void ClassLoader::trace_class_path(outputStream* out, const char* msg, const char* name) {
+void ClassLoader::trace_class_path(const char* msg, const char* name) {
-  if (!TraceClassPaths) {
+  if (log_is_enabled(Info, classpath)) {
-    return;
+    ResourceMark rm;
-  }
+    outputStream* out = LogHandle(classpath)::info_stream();
-
+    if (msg) {
-  if (msg) {
+      out->print("%s", msg);
-    out->print("%s", msg);
+    }
-  }
+    if (name) {
-  if (name) {
+      if (strlen(name) < 256) {
-    if (strlen(name) < 256) {
+        out->print("%s", name);
-      out->print("%s", name);
+      } else {
-    } else {
+        // For very long paths, we need to print each character separately,
-      // For very long paths, we need to print each character separately,
+        // as print_cr() has a length limit
-      // as print_cr() has a length limit
+        while (name[0] != '\0') {
-      while (name[0] != '\0') {
+          out->print("%c", name[0]);
-        out->print("%c", name[0]);
+          name++;
-        name++;
+        }
       }
     }
-  }
-  if (msg && msg[0] == '[') {
-    out->print_cr("]");
-  } else {
     out->cr();
   }
 }
@@ -470,11 +467,13 @@ void ClassLoader::check_shared_classpath(const char *path) {
 void ClassLoader::setup_bootstrap_search_path() {
   assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
   const char* sys_class_path = Arguments::get_sysclasspath();
+  const char* java_class_path = Arguments::get_appclasspath();
   if (PrintSharedArchiveAndExit) {
     // 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(tty, "[Bootstrap loader class path=", sys_class_path);
+    trace_class_path("bootstrap loader class path=", sys_class_path);
+    trace_class_path("classpath: ", java_class_path);
   }
 #if INCLUDE_CDS
   if (DumpSharedSpaces) {
@@ -578,9 +577,7 @@ ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const str
         }
       }
     }
-    if (TraceClassPaths) {
+    log_info(classpath)("opened: %s", path);
-      tty->print_cr("[Opened %s]", path);
-    }
     log_info(classload)("opened: %s", path);
   } else {
     // Directory

hotspot/src/share/vm/classfile/classLoader.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, 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
@@ -331,7 +331,7 @@ class ClassLoader: AllStatic {
   static void  exit_with_path_failure(const char* error, const char* message);
 #endif
 
-  static void  trace_class_path(outputStream* out, const char* msg, const char* name = NULL);
+  static void  trace_class_path(const char* msg, const char* name = NULL);
 
   // VM monitoring and management support
   static jlong classloader_time_ms();

hotspot/src/share/vm/classfile/sharedPathsMiscInfo.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2016, 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
@@ -26,15 +26,15 @@
 #include "classfile/classLoader.hpp"
 #include "classfile/classLoaderData.inline.hpp"
 #include "classfile/sharedPathsMiscInfo.hpp"
+#include "logging/log.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/metaspaceShared.hpp"
 #include "runtime/arguments.hpp"
+#include "utilities/ostream.hpp"
 
 void SharedPathsMiscInfo::add_path(const char* path, int type) {
-  if (TraceClassPaths) {
+  log_info(classpath)("type=%s ", type_name(type));
-    tty->print("[type=%s] ", type_name(type));
+  ClassLoader::trace_class_path("add misc shared path ", path);
-    trace_class_path("[Add misc shared path ", path);
-  }
   write(path, strlen(path) + 1);
   write_jint(jint(type));
 }
@@ -67,11 +67,29 @@ bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
 }
 
 bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
-  ClassLoader::trace_class_path(tty, msg, name);
+  ClassLoader::trace_class_path(msg, name);
   MetaspaceShared::set_archive_loading_failed();
   return false;
 }
 
+void SharedPathsMiscInfo::print_path(int type, const char* path) {
+  ResourceMark rm;
+  outputStream* out = LogHandle(classpath)::info_stream();
+  switch (type) {
+  case BOOT:
+    out->print("Expecting -Dsun.boot.class.path=%s", path);
+    break;
+  case NON_EXIST:
+    out->print("Expecting that %s does not exist", path);
+    break;
+  case REQUIRED:
+    out->print("Expecting that file %s must exist and is not altered", path);
+    break;
+  default:
+    ShouldNotReachHere();
+  }
+}
+
 bool SharedPathsMiscInfo::check() {
   // The whole buffer must be 0 terminated so that we can use strlen and strcmp
   // without fear.
@@ -90,17 +108,14 @@ bool SharedPathsMiscInfo::check() {
     if (!read_jint(&type)) {
       return fail("Corrupted archive file header");
     }
-    if (TraceClassPaths) {
+    log_info(classpath)("type=%s ", type_name(type));
-      tty->print("[type=%s ", type_name(type));
+    print_path(type, path);
-      print_path(tty, type, path);
-      tty->print_cr("]");
-    }
     if (!check(type, path)) {
       if (!PrintSharedArchiveAndExit) {
         return false;
       }
     } else {
-      trace_class_path("[ok");
+      ClassLoader::trace_class_path("ok");
     }
   }
 

hotspot/src/share/vm/classfile/sharedPathsMiscInfo.hpp

@@ -64,9 +64,6 @@ protected:
   void write(const void* ptr, size_t size);
   bool read(void* ptr, size_t size);
 
-  static void trace_class_path(const char* msg, const char* name = NULL) {
-    ClassLoader::trace_class_path(tty, msg, name);
-  }
 protected:
   static bool fail(const char* msg, const char* name = NULL);
   virtual bool check(jint type, const char* path);
@@ -144,21 +141,7 @@ public:
     }
   }
 
-  virtual void print_path(outputStream* out, int type, const char* path) {
+  virtual void print_path(int type, const char* path);
-    switch (type) {
-    case BOOT:
-      out->print("Expecting -Dsun.boot.class.path=%s", path);
-      break;
-    case NON_EXIST:
-      out->print("Expecting that %s does not exist", path);
-      break;
-    case REQUIRED:
-      out->print("Expecting that file %s must exist and is not altered", path);
-      break;
-    default:
-      ShouldNotReachHere();
-    }
-  }
 
   bool check();
   bool read_jint(jint *ptr) {

hotspot/src/share/vm/logging/logTag.hpp

@@ -43,6 +43,7 @@
   LOG_TAG(classload) /* Trace all classes loaded */ \
   LOG_TAG(classloaderdata) /* class loader loader_data lifetime */ \
   LOG_TAG(classunload) /* Trace unloading of classes */ \
+  LOG_TAG(classpath) \
   LOG_TAG(compaction) \
   LOG_TAG(cpu) \
   LOG_TAG(cset) \

hotspot/src/share/vm/memory/filemap.cpp

@@ -208,9 +208,7 @@ void FileMapInfo::allocate_classpath_entry_table() {
         count ++;
         bytes += (int)entry_size;
         bytes += name_bytes;
-        if (TraceClassPaths) {
+        log_info(classpath)("add main shared path (%s) %s", (cpe->is_jar_file() ? "jar" : "dir"), name);
-          tty->print_cr("[Add main shared path (%s) %s]", (cpe->is_jar_file() ? "jar" : "dir"), name);
-        }
       } else {
         SharedClassPathEntry* ent = shared_classpath(cur_entry);
         if (cpe->is_jar_file()) {
@@ -275,9 +273,7 @@ bool FileMapInfo::validate_classpath_entry_table() {
     struct stat st;
     const char* name = ent->_name;
     bool ok = true;
-    if (TraceClassPaths) {
+    log_info(classpath)("checking shared classpath entry: %s", name);
-      tty->print_cr("[Checking shared classpath entry: %s]", name);
-    }
     if (os::stat(name, &st) != 0) {
       fail_continue("Required classpath entry does not exist: %s", name);
       ok = false;
@@ -301,9 +297,7 @@ bool FileMapInfo::validate_classpath_entry_table() {
       }
     }
     if (ok) {
-      if (TraceClassPaths) {
+      log_info(classpath)("ok");
-        tty->print_cr("[ok]");
-      }
     } else if (!PrintSharedArchiveAndExit) {
       _validating_classpath_entry_table = false;
       return false;
@@ -888,10 +882,8 @@ bool FileMapInfo::FileMapHeader::validate() {
   char header_version[JVM_IDENT_MAX];
   get_header_version(header_version);
   if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
-    if (TraceClassPaths) {
+    log_info(classpath)("expected: %s", header_version);
-      tty->print_cr("Expected: %s", header_version);
+    log_info(classpath)("actual:   %s", _jvm_ident);
-      tty->print_cr("Actual:   %s", _jvm_ident);
-    }
     FileMapInfo::fail_continue("The shared archive file was created by a different"
                   " version or build of HotSpot");
     return false;
@@ -919,7 +911,7 @@ bool FileMapInfo::validate_header() {
   if (status) {
     if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) {
       if (!PrintSharedArchiveAndExit) {
-        fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)");
+        fail_continue("shared class paths mismatch (hint: enable -Xlog:classpath=info to diagnose the failure)");
         status = false;
       }
     }

hotspot/src/share/vm/runtime/arguments.cpp

@@ -405,8 +405,9 @@ static AliasedFlag const aliased_jvm_flags[] = {
 
 static AliasedLoggingFlag const aliased_logging_flags[] = {
   { "TraceClassLoading",         LogLevel::Info,  true,  LogTag::_classload },
-  { "TraceClassUnloading",       LogLevel::Info,  true,  LogTag::_classunload },
+  { "TraceClassPaths",           LogLevel::Info,  true,  LogTag::_classpath },
   { "TraceClassResolution",      LogLevel::Info,  true,  LogTag::_classresolve },
+  { "TraceClassUnloading",       LogLevel::Info,  true,  LogTag::_classunload },
   { "TraceExceptions",           LogLevel::Info,  true,  LogTag::_exceptions },
   { "TraceMonitorInflation",     LogLevel::Debug, true,  LogTag::_monitorinflation },
   { "TraceBiasedLocking",        LogLevel::Info,  true,  LogTag::_biasedlocking },
@@ -3255,7 +3256,7 @@ jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
 
   // PrintSharedArchiveAndExit will turn on
   //   -Xshare:on
-  //   -XX:+TraceClassPaths
+  //   -Xlog:classpath=info
   if (PrintSharedArchiveAndExit) {
     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
       return JNI_EINVAL;
@@ -3263,9 +3264,7 @@ jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
       return JNI_EINVAL;
     }
-    if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
+    LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath));
-      return JNI_EINVAL;
-    }
   }
 
   // Change the default value for flags  which have different default values
@@ -3318,10 +3317,6 @@ void Arguments::fix_appclasspath() {
     _java_class_path->set_value(copy);
     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
   }
-
-  if (!PrintSharedArchiveAndExit) {
-    ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
-  }
 }
 
 static bool has_jar_files(const char* directory) {

hotspot/src/share/vm/runtime/globals.hpp

@@ -2403,9 +2403,6 @@ public:
   product(bool, IgnoreEmptyClassPaths, false,                               \
           "Ignore empty path elements in -classpath")                       \
                                                                             \
-  product(bool, TraceClassPaths, false,                                     \
-          "Trace processing of class paths")                                \
-                                                                            \
   product(bool, TraceClassLoadingPreorder, false,                           \
           "Trace all classes loaded in order referenced (not loaded)")      \
                                                                             \