diff --git a/src/hotspot/share/opto/phasetype.cpp b/src/hotspot/share/opto/phasetype.cpp
new file mode 100644
index 0000000000000..3e18bd089baf1
--- /dev/null
+++ b/src/hotspot/share/opto/phasetype.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2012, 2025, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "phasetype.hpp"
+
+const char* const CompilerPhaseTypeHelper::_phase_descriptions[] = {
+#define array_of_labels(name, description) description,
+       COMPILER_PHASES(array_of_labels)
+#undef array_of_labels
+};
+
+const char* const CompilerPhaseTypeHelper::_phase_names[] = {
+#define array_of_labels(name, description) #name,
+       COMPILER_PHASES(array_of_labels)
+#undef array_of_labels
+};
+
+CompilerPhaseType CompilerPhaseTypeHelper::find_phase(const char* str) {
+  for (int i = 0; i < PHASE_NUM_TYPES; i++) {
+    if (strcmp(CompilerPhaseTypeHelper::_phase_names[i], str) == 0) {
+      return (CompilerPhaseType)i;
+    }
+  }
+  return PHASE_NONE;
+}
diff --git a/src/hotspot/share/opto/phasetype.hpp b/src/hotspot/share/opto/phasetype.hpp
index 942850cf89225..5c733c7dc0ab9 100644
--- a/src/hotspot/share/opto/phasetype.hpp
+++ b/src/hotspot/share/opto/phasetype.hpp
@@ -138,36 +138,21 @@ enum CompilerPhaseType {
 };
 #undef table_entry
 
-static const char* phase_descriptions[] = {
-#define array_of_labels(name, description) description,
-       COMPILER_PHASES(array_of_labels)
-#undef array_of_labels
-};
-
-static const char* phase_names[] = {
-#define array_of_labels(name, description) #name,
-       COMPILER_PHASES(array_of_labels)
-#undef array_of_labels
-};
-
 class CompilerPhaseTypeHelper {
-  public:
+ private:
+  static const char* const _phase_descriptions[];
+  static const char* const _phase_names[];
+
+ public:
   static const char* to_name(CompilerPhaseType cpt) {
-    return phase_names[cpt];
+    return _phase_names[cpt];
   }
   static const char* to_description(CompilerPhaseType cpt) {
-    return phase_descriptions[cpt];
+    return _phase_descriptions[cpt];
   }
-};
 
-static CompilerPhaseType find_phase(const char* str) {
-  for (int i = 0; i < PHASE_NUM_TYPES; i++) {
-    if (strcmp(phase_names[i], str) == 0) {
-      return (CompilerPhaseType)i;
-    }
-  }
-  return PHASE_NONE;
-}
+  static CompilerPhaseType find_phase(const char* str);
+};
 
 class PhaseNameValidator {
  private:
@@ -183,7 +168,7 @@ class PhaseNameValidator {
   {
     for (StringUtils::CommaSeparatedStringIterator iter(option); *iter != nullptr && _valid; ++iter) {
 
-      CompilerPhaseType cpt = find_phase(*iter);
+      CompilerPhaseType cpt = CompilerPhaseTypeHelper::find_phase(*iter);
       if (PHASE_NONE == cpt) {
         const size_t len = MIN2<size_t>(strlen(*iter), 63) + 1;  // cap len to a value we know is enough for all phase descriptions
         _bad = NEW_C_HEAP_ARRAY(char, len, mtCompiler);