6898160: Need serviceability support for new vm argument type 'uint64_t'

Summary: Add serviceability support for uint64_t. Flags of unknown type assert in debug builds and are ignored in product builds.
Reviewed-by: never, xlu, mchung, dcubed

src/share/vm/runtime/globals.cpp

@@ -72,6 +72,7 @@ void Flag::print_on(outputStream* st) {
   if (is_bool())     st->print("%-16s", get_bool() ? "true" : "false");
   if (is_intx())     st->print("%-16ld", get_intx());
   if (is_uintx())    st->print("%-16lu", get_uintx());
+  if (is_uint64_t()) st->print("%-16lu", get_uint64_t());
   if (is_ccstr()) {
     const char* cp = get_ccstr();
     if (cp != NULL) {
@@ -100,6 +101,8 @@ void Flag::print_as_flag(outputStream* st) {
     st->print("-XX:%s=" INTX_FORMAT, name, get_intx());
   } else if (is_uintx()) {
     st->print("-XX:%s=" UINTX_FORMAT, name, get_uintx());
+  } else if (is_uint64_t()) {
+    st->print("-XX:%s=" UINT64_FORMAT, name, get_uint64_t());
   } else if (is_ccstr()) {
     st->print("-XX:%s=", name);
     const char* cp = get_ccstr();

src/share/vm/services/attachListener.cpp

@@ -207,7 +207,7 @@ static jint set_bool_flag(const char* name, AttachOperation* op, outputStream* o
     int tmp;
     int n = sscanf(arg1, "%d", &tmp);
     if (n != 1) {
-      out->print_cr("flag value has to be boolean (1 or 0)");
+      out->print_cr("flag value must be a boolean (1 or 0)");
       return JNI_ERR;
     }
     value = (tmp != 0);
@@ -226,7 +226,7 @@ static jint set_intx_flag(const char* name, AttachOperation* op, outputStream* o
   if ((arg1 = op->arg(1)) != NULL) {
     int n = sscanf(arg1, INTX_FORMAT, &value);
     if (n != 1) {
-      out->print_cr("flag value has to be integer");
+      out->print_cr("flag value must be an integer");
       return JNI_ERR;
     }
   }
@@ -245,7 +245,7 @@ static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream*
   if ((arg1 = op->arg(1)) != NULL) {
     int n = sscanf(arg1, UINTX_FORMAT, &value);
     if (n != 1) {
-      out->print_cr("flag value has to be integer");
+      out->print_cr("flag value must be an unsigned integer");
       return JNI_ERR;
     }
   }
@@ -257,11 +257,30 @@ static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream*
   return res? JNI_OK : JNI_ERR;
 }
 
+// set a uint64_t global flag using value from AttachOperation
+static jint set_uint64_t_flag(const char* name, AttachOperation* op, outputStream* out) {
+  uint64_t value;
+  const char* arg1;
+  if ((arg1 = op->arg(1)) != NULL) {
+    int n = sscanf(arg1, UINT64_FORMAT, &value);
+    if (n != 1) {
+      out->print_cr("flag value must be an unsigned 64-bit integer");
+      return JNI_ERR;
+    }
+  }
+  bool res = CommandLineFlags::uint64_tAtPut((char*)name, &value, ATTACH_ON_DEMAND);
+  if (! res) {
+    out->print_cr("setting flag %s failed", name);
+  }
+
+  return res? JNI_OK : JNI_ERR;
+}
+
 // set a string global flag using value from AttachOperation
 static jint set_ccstr_flag(const char* name, AttachOperation* op, outputStream* out) {
   const char* value;
   if ((value = op->arg(1)) == NULL) {
-    out->print_cr("flag value has to be a string");
+    out->print_cr("flag value must be a string");
     return JNI_ERR;
   }
   bool res = CommandLineFlags::ccstrAtPut((char*)name, &value, ATTACH_ON_DEMAND);
@@ -291,6 +310,8 @@ static jint set_flag(AttachOperation* op, outputStream* out) {
       return set_intx_flag(name, op, out);
     } else if (f->is_uintx()) {
       return set_uintx_flag(name, op, out);
+    } else if (f->is_uint64_t()) {
+      return set_uint64_t_flag(name, op, out);
     } else if (f->is_ccstr()) {
       return set_ccstr_flag(name, op, out);
     } else {

src/share/vm/services/management.cpp

@@ -1507,16 +1507,17 @@ JVM_ENTRY(jobjectArray, jmm_GetVMGlobalNames(JNIEnv *env))
   return (jobjectArray)JNIHandles::make_local(env, flags_ah());
 JVM_END
 
-// utility function used by jmm_GetVMGlobals
-void add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
+// Utility function used by jmm_GetVMGlobals.  Returns false if flag type
+// can't be determined, true otherwise.  If false is returned, then *global
+// will be incomplete and invalid.
+bool add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag, TRAPS) {
   Handle flag_name;
   if (name() == NULL) {
-    flag_name = java_lang_String::create_from_str(flag->name, CHECK);
+    flag_name = java_lang_String::create_from_str(flag->name, CHECK_false);
   } else {
     flag_name = name;
   }
   global->name = (jstring)JNIHandles::make_local(env, flag_name());
-  global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
 
   if (flag->is_bool()) {
     global->value.z = flag->get_bool() ? JNI_TRUE : JNI_FALSE;
@@ -1527,10 +1528,17 @@ void add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag,
   } else if (flag->is_uintx()) {
     global->value.j = (jlong)flag->get_uintx();
     global->type = JMM_VMGLOBAL_TYPE_JLONG;
+  } else if (flag->is_uint64_t()) {
+    global->value.j = (jlong)flag->get_uint64_t();
+    global->type = JMM_VMGLOBAL_TYPE_JLONG;
   } else if (flag->is_ccstr()) {
-    Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK);
+    Handle str = java_lang_String::create_from_str(flag->get_ccstr(), CHECK_false);
     global->value.l = (jobject)JNIHandles::make_local(env, str());
     global->type = JMM_VMGLOBAL_TYPE_JSTRING;
+  } else {
+    global->type = JMM_VMGLOBAL_TYPE_UNKNOWN;
+    assert(false, "Unsupported VMGlobal Type");
+    return false;
   }
 
   global->writeable = flag->is_writeable();
@@ -1557,6 +1565,8 @@ void add_global_entry(JNIEnv* env, Handle name, jmmVMGlobal *global, Flag *flag,
     default:
       global->origin = JMM_VMGLOBAL_ORIGIN_OTHER;
   }
+
+  return true;
 }
 
 // Fill globals array of count length with jmmVMGlobal entries
@@ -1599,8 +1609,8 @@ JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
       Handle sh(THREAD, s);
       char* str = java_lang_String::as_utf8_string(s);
       Flag* flag = Flag::find_flag(str, strlen(str));
-      if (flag != NULL) {
-        add_global_entry(env, sh, &globals[i], flag, THREAD);
+      if (flag != NULL &&
+          add_global_entry(env, sh, &globals[i], flag, THREAD)) {
         num_entries++;
       } else {
         globals[i].name = NULL;
@@ -1617,8 +1627,8 @@ JVM_ENTRY(jint, jmm_GetVMGlobals(JNIEnv *env,
     for (int i = 0; i < nFlags && num_entries < count;  i++) {
       Flag* flag = &Flag::flags[i];
       // Exclude the locked (diagnostic, experimental) flags
-      if (flag->is_unlocked() || flag->is_unlocker()) {
-        add_global_entry(env, null_h, &globals[num_entries], flag, THREAD);
+      if ((flag->is_unlocked() || flag->is_unlocker()) &&
+          add_global_entry(env, null_h, &globals[num_entries], flag, THREAD)) {
         num_entries++;
       }
     }
@@ -1650,11 +1660,14 @@ JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value
     bool bvalue = (new_value.z == JNI_TRUE ? true : false);
     succeed = CommandLineFlags::boolAtPut(name, &bvalue, MANAGEMENT);
   } else if (flag->is_intx()) {
-    intx ivalue = new_value.j;
+    intx ivalue = (intx)new_value.j;
     succeed = CommandLineFlags::intxAtPut(name, &ivalue, MANAGEMENT);
   } else if (flag->is_uintx()) {
-    uintx uvalue = new_value.j;
+    uintx uvalue = (uintx)new_value.j;
     succeed = CommandLineFlags::uintxAtPut(name, &uvalue, MANAGEMENT);
+  } else if (flag->is_uint64_t()) {
+    uint64_t uvalue = (uint64_t)new_value.j;
+    succeed = CommandLineFlags::uint64_tAtPut(name, &uvalue, MANAGEMENT);
   } else if (flag->is_ccstr()) {
     oop str = JNIHandles::resolve_external_guard(new_value.l);
     if (str == NULL) {