7176856: add the JRE name to the error log

Reviewed-by: coleenp, jrose, kvn, twisti

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

@@ -111,6 +111,10 @@
   template(getBootClassPathEntryForClass_name,        "getBootClassPathEntryForClass")            \
   template(sun_misc_PostVMInitHook,                   "sun/misc/PostVMInitHook")                  \
                                                                                                   \
+  /* Java runtime version access */                                                               \
+  template(sun_misc_Version,                          "sun/misc/Version")                         \
+  template(java_runtime_name_name,                    "java_runtime_name")                        \
+                                                                                                  \
   /* class file format tags */                                                                    \
   template(tag_source_file,                           "SourceFile")                               \
   template(tag_inner_classes,                         "InnerClasses")                             \

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

@@ -660,6 +660,7 @@ void vm_shutdown_during_initialization(const char* error, const char* message) {
 }
 
 JDK_Version JDK_Version::_current;
+const char* JDK_Version::_runtime_name;
 
 void JDK_Version::initialize() {
   jdk_version_info info;

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

@@ -74,6 +74,7 @@ class JDK_Version VALUE_OBJ_CLASS_SPEC {
  private:
 
   static JDK_Version _current;
+  static const char* _runtime_name;
 
   // In this class, we promote the minor version of release to be the
   // major version for releases >= 5 in anticipation of the JDK doing the
@@ -181,6 +182,13 @@ class JDK_Version VALUE_OBJ_CLASS_SPEC {
 
   void to_string(char* buffer, size_t buflen) const;
 
+  static const char* runtime_name() {
+    return _runtime_name;
+  }
+  static void set_runtime_name(const char* name) {
+    _runtime_name = name;
+  }
+
   // Convenience methods for queries on the current major/minor version
   static bool is_jdk12x_version() {
     return current().compare_major(2) == 0;

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

@@ -996,6 +996,29 @@ static void call_initializeSystemClass(TRAPS) {
                                          vmSymbols::void_method_signature(), CHECK);
 }
 
+char java_runtime_name[128] = "";
+
+// extract the JRE name from sun.misc.Version.java_runtime_name
+static const char* get_java_runtime_name(TRAPS) {
+  klassOop k = SystemDictionary::find(vmSymbols::sun_misc_Version(),
+                                      Handle(), Handle(), CHECK_AND_CLEAR_NULL);
+  fieldDescriptor fd;
+  bool found = k != NULL &&
+               instanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(),
+                                                        vmSymbols::string_signature(), &fd);
+  if (found) {
+    oop name_oop = k->java_mirror()->obj_field(fd.offset());
+    if (name_oop == NULL)
+      return NULL;
+    const char* name = java_lang_String::as_utf8_string(name_oop,
+                                                        java_runtime_name,
+                                                        sizeof(java_runtime_name));
+    return name;
+  } else {
+    return NULL;
+  }
+}
+
 // 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) {
@@ -3352,6 +3375,9 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
       // The VM creates & returns objects of this class. Make sure it's initialized.
       initialize_class(vmSymbols::java_lang_Class(), CHECK_0);
       call_initializeSystemClass(CHECK_0);
+
+      // get the Java runtime name after java.lang.System is initialized
+      JDK_Version::set_runtime_name(get_java_runtime_name(THREAD));
     } else {
       warning("java.lang.System not initialized");
     }

hotspot/src/share/vm/utilities/vmError.cpp

@@ -450,7 +450,9 @@ void VMError::report(outputStream* st) {
      // VM version
      st->print_cr("#");
      JDK_Version::current().to_string(buf, sizeof(buf));
-     st->print_cr("# JRE version: %s", buf);
+     const char* runtime_name = JDK_Version::runtime_name() != NULL ?
+                                  JDK_Version::runtime_name() : "";
+     st->print_cr("# JRE version: %s (%s)", runtime_name, buf);
      st->print_cr("# Java VM: %s (%s %s %s %s)",
                    Abstract_VM_Version::vm_name(),
                    Abstract_VM_Version::vm_release(),