src/jdk.jdeps/share/classes/com/sun/tools/jdeps/JdepsConfiguration.java

@@ -68,10 +68,11 @@
 
 public class JdepsConfiguration implements AutoCloseable {
     // the token for "all modules on the module path"
     public static final String ALL_MODULE_PATH = "ALL-MODULE-PATH";
     public static final String ALL_DEFAULT = "ALL-DEFAULT";
+    public static final String ALL_SYSTEM = "ALL-SYSTEM";
     public static final String MODULE_INFO = "module-info.class";
 
     private final SystemModuleFinder system;
     private final ModuleFinder finder;
 

@@ -197,16 +198,14 @@
         Objects.requireNonNull(name);
         Module m = nameToModule.get(name);
         return m!= null ? Optional.of(m.descriptor()) : Optional.empty();
     }
 
-    boolean isSystem(Module m) {
-        return system.find(m.name()).isPresent();
-    }
-
     boolean isValidToken(String name) {
-        return ALL_MODULE_PATH.equals(name) || ALL_DEFAULT.equals(name);
+        return ALL_MODULE_PATH.equals(name) ||
+                ALL_DEFAULT.equals(name) ||
+                ALL_SYSTEM.equals(name);
     }
 
     /**
      * Returns the modules that the given module can read
      */

@@ -532,10 +531,13 @@
                         this.addAllApplicationModules = true;
                         break;
                     case ALL_DEFAULT:
                         this.addAllDefaultModules = true;
                         break;
+                    case ALL_SYSTEM:
+                        this.addAllSystemModules = true;
+                        break;
                     default:
                         this.rootModules.add(mn);
                 }
             }
             return this;