[O] Refactor

CreateMarsJar.bat

@@ -1 +0,0 @@
-jar cmf mainclass.txt Mars.jar PseudoOps.txt Config.properties Syscall.properties Settings.properties MARSlicense.txt mainclass.txt MipsXRayOpcode.xml registerDatapath.xml controlDatapath.xml ALUcontrolDatapath.xml CreateMarsJar.bat CreateMarsJar.sh Mars.java Mars.class docs help images mars 

CreateMarsJar.sh

@@ -1,2 +0,0 @@
-# If you can't generate due of permissions, do a "chmod +x CreateMarsJar.sh".
-jar cmf mainclass.txt Mars.jar PseudoOps.txt Config.properties Syscall.properties Settings.properties MARSlicense.txt mainclass.txt MipsXRayOpcode.xml registerDatapath.xml controlDatapath.xml ALUcontrolDatapath.xml CreateMarsJar.bat CreateMarsJar.sh Mars.java Mars.class docs help images mars 

build.gradle

@@ -1,12 +1,3 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * This generated file contains a sample Java application project to get you started.
- * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
- * User Manual available at https://docs.gradle.org/7.5.1/userguide/building_java_projects.html
- * This project uses @Incubating APIs which are subject to change.
- */
-
 plugins {
     // Apply the application plugin to add support for building a CLI application in Java.
     id 'application'
@@ -34,5 +25,5 @@ testing {
 
 application {
     // Define the main class for the application.
-    mainClass = 'mars.assembler.App'
+    mainClass = 'Mars'
 }

convert_encoding.py

@@ -0,0 +1,17 @@
+import os
+from pathlib import Path
+from subprocess import check_output
+
+if __name__ == '__main__':
+    java = Path('src/main/java')
+    files = [Path(root) / f for root, dir, files in os.walk(java) for f in files]
+
+    for f in files:
+        ftype = check_output(f'file {f}', shell=True).decode()
+        if '8859' not in ftype:
+            continue
+
+        print(f'Converting {f} to UTF-8...')
+        f.write_text(f.read_text('ISO-8859-1'), 'utf8')
+
+    # print(files)

settings.gradle

@@ -1,11 +1 @@
-/*
+rootProject.name = 'MARS'
- * This file was generated by the Gradle 'init' task.
- *
- * The settings file is used to specify which projects to include in your build.
- *
- * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/7.5.1/userguide/multi_project_builds.html
- * This project uses @Incubating APIs which are subject to change.
- */
-
-rootProject.name = 'MARS-Assembler'

src/main/java/Mars.java

@@ -1,4 +1,3 @@
-
 /*
 Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
 
@@ -34,9 +33,9 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  * @version March 2006
  **/
 
-    public class Mars {
+public class Mars {
-       public static void main(String[] args) {
+    public static void main(String[] args) {
-         new mars.MarsLaunch(args);
+        new mars.MarsLaunch(args);
-      }
+    }
-   } 
+}
 

src/main/java/mainclass.txt

@@ -1,2 +0,0 @@
-Main-Class: Mars
-Class-Path: .

src/main/java/mars/Globals.java

@@ -1,12 +1,16 @@
-   package mars;
+package mars;
-   import mars.mips.instructions.syscalls.*;
+
-   import mars.mips.instructions.*;
+import mars.assembler.SymbolTable;
-   import mars.mips.hardware.*;
+import mars.mips.hardware.Memory;
-   import mars.assembler.*;
+import mars.mips.instructions.InstructionSet;
-   import mars.venus.*;
+import mars.mips.instructions.syscalls.SyscallNumberOverride;
-   import mars.util.*;
+import mars.util.PropertiesFile;
-   import java.io.*;
+import mars.venus.VenusUI;
-   import java.util.*;
+
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.Properties;
+import java.util.StringTokenizer;
 	
 /*
 Copyright (c) 2003-2008,  Pete Sanderson and Kenneth Vollmar
@@ -42,84 +46,123 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  * @author Pete Sanderson
  * @version August 2003
  */
-    public class Globals
+public class Globals {
-   {
+    /**
-      // List these first because they are referenced by methods called at initialization.
+     * Path to folder that contains images
-      private static String configPropertiesFile = "Config";
+     */
-      private static String syscallPropertiesFile = "Syscall";
-   	
-    /** The set of implemented MIPS instructions. **/
-      public static InstructionSet instructionSet;
-   /** the program currently being worked with.  Used by GUI only, not command line. **/
-      public static MIPSprogram program;
-   /** Symbol table for file currently being assembled. **/
-      public static SymbolTable symbolTable;
-    /** Simulated MIPS memory component. **/
-      public static Memory memory;
-    /** Lock variable used at head of synchronized block to guard MIPS memory and registers **/
-      public static Object memoryAndRegistersLock = new Object();
-    /** Flag to determine whether or not to produce internal debugging information. **/
-      public static boolean debug = false;
-    /** Object that contains various settings that can be accessed modified internally. **/
-      static Settings settings;
-    /** String to GUI's RunI/O text area when echoing user input from pop-up dialog. */
-      public static String userInputAlert = "**** user input : ";
-    /** Path to folder that contains images */	
     // The leading "/" in filepath prevents package name from being pre-pended.
-      public static final String imagesPath = "/images/";
+    public static final String imagesPath = "/images/";
-   	/** Path to folder that contains help text */	
+    /**
-      public static final String helpPath = "/help/";
+     * Path to folder that contains help text
-    /* Flag that indicates whether or not instructionSet has been initialized. */
+     */
-      private static boolean initialized = false;
+    public static final String helpPath = "/help/";
+    /**
+     * The current MARS version number. Can't wait for "initialize()" call to get it.
+     */
+    public static final String version = "4.5";
+    /**
+     * MARS copyright years
+     */
+    public static final String copyrightYears = getCopyrightYears();
+    /**
+     * MARS copyright holders
+     */
+    public static final String copyrightHolders = getCopyrightHolders();
+    /**
+     * The set of implemented MIPS instructions.
+     **/
+    public static InstructionSet instructionSet;
+    /**
+     * the program currently being worked with.  Used by GUI only, not command line.
+     **/
+    public static MIPSprogram program;
+    /**
+     * Symbol table for file currently being assembled.
+     **/
+    public static SymbolTable symbolTable;
+    /**
+     * Simulated MIPS memory component.
+     **/
+    public static Memory memory;
+    /**
+     * Lock variable used at head of synchronized block to guard MIPS memory and registers
+     **/
+    public static Object memoryAndRegistersLock = new Object();
+    /**
+     * Flag to determine whether or not to produce internal debugging information.
+     **/
+    public static boolean debug = false;
+    /**
+     * String to GUI's RunI/O text area when echoing user input from pop-up dialog.
+     */
+    public static String userInputAlert = "**** user input : ";
+    /**
+     * MARS exit code -- useful with SYSCALL 17 when running from command line (not GUI)
+     */
+    public static int exitCode = 0;
+    public static boolean runSpeedPanelExists = false;
+    /**
+     * Object that contains various settings that can be accessed modified internally.
+     **/
+    static Settings settings;
     /* The GUI being used (if any) with this simulator. */
-      static VenusUI gui = null;
+    static VenusUI gui = null;
-    /** The current MARS version number. Can't wait for "initialize()" call to get it. */
+    // List these first because they are referenced by methods called at initialization.
-      public static final String version = "4.5";
+    private static final String configPropertiesFile = "Config";
-    /** List of accepted file extensions for MIPS assembly source files. */
+    /**
-      public static final ArrayList fileExtensions = getFileExtensions();
+     * List of accepted file extensions for MIPS assembly source files.
-    /** Maximum length of scrolled message window (MARS Messages and Run I/O) */
+     */
-      public static final int maximumMessageCharacters = getMessageLimit();
+    public static final ArrayList fileExtensions = getFileExtensions();
-    /** Maximum number of assembler errors produced by one assemble operation */
+    /**
-      public static final int maximumErrorMessages = getErrorLimit();
+     * Maximum length of scrolled message window (MARS Messages and Run I/O)
-    /** Maximum number of back-step operations to buffer */
+     */
-      public static final int maximumBacksteps = getBackstepLimit();
+    public static final int maximumMessageCharacters = getMessageLimit();
-   	/** MARS copyright years */
+    /**
-      public static final String copyrightYears = getCopyrightYears();
+     * Maximum number of assembler errors produced by one assemble operation
-   	/** MARS copyright holders */
+     */
-      public static final String copyrightHolders = getCopyrightHolders(); 
+    public static final int maximumErrorMessages = getErrorLimit();
-		/** Placeholder for non-printable ASCII codes */
+    /**
-		public static final String ASCII_NON_PRINT = getAsciiNonPrint();
+     * Maximum number of back-step operations to buffer
-		/** Array of strings to display for ASCII codes in ASCII display of data segment. ASCII code 0-255 is array index. */
+     */
-		public static final String[] ASCII_TABLE = getAsciiStrings();
+    public static final int maximumBacksteps = getBackstepLimit();
-      /** MARS exit code -- useful with SYSCALL 17 when running from command line (not GUI) */
+    /**
-      public static int exitCode = 0;
+     * Placeholder for non-printable ASCII codes
+     */
+    public static final String ASCII_NON_PRINT = getAsciiNonPrint();
+    /**
+     * Array of strings to display for ASCII codes in ASCII display of data segment. ASCII code 0-255 is array index.
+     */
+    public static final String[] ASCII_TABLE = getAsciiStrings();
+    private static final String syscallPropertiesFile = "Syscall";
+    /* Flag that indicates whether or not instructionSet has been initialized. */
+    private static boolean initialized = false;
 
-      public static boolean runSpeedPanelExists = false;
+    private static String getCopyrightYears() {
+        return "2003-2014";
+    }
 
-       private static String getCopyrightYears() {
+    private static String getCopyrightHolders() {
-         return "2003-2014";
+        return "Pete Sanderson and Kenneth Vollmar";
-      }
+    }
-       private static String getCopyrightHolders() {
-         return "Pete Sanderson and Kenneth Vollmar";
-      }
 
-       public static void setGui(VenusUI g) {
+    public static VenusUI getGui() {
-         gui = g;
+        return gui;
-      }
+    }
-       public static VenusUI getGui() {
-         return gui;
-      }
 
-       public static Settings getSettings() {
+    public static void setGui(VenusUI g) {
-         return settings;
+        gui = g;
-      }
+    }
+
+    public static Settings getSettings() {
+        return settings;
+    }
 
     /**
      * Method called once upon system initialization to create the global data structures.
      **/
 
-       public static void initialize(boolean gui) {
+    public static void initialize(boolean gui) {
-         if (!initialized) {
+        if (!initialized) {
             memory = Memory.getInstance();  //clients can use Memory.getInstance instead of Globals.memory
             instructionSet = new InstructionSet();
             instructionSet.populate();
@@ -127,123 +170,126 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
             settings = new Settings(gui);
             initialized = true;
             debug = false;
-				memory.clear(); // will establish memory configuration from setting
+            memory.clear(); // will establish memory configuration from setting
-         }
+        }
-      }
+    }
 
-   	// Read byte limit of Run I/O or MARS Messages text to buffer.
+    // Read byte limit of Run I/O or MARS Messages text to buffer.
-       private static int getMessageLimit() {
+    private static int getMessageLimit() {
-         return getIntegerProperty(configPropertiesFile, "MessageLimit", 1000000);
+        return getIntegerProperty(configPropertiesFile, "MessageLimit", 1000000);
-      }
+    }
 
-   	// Read limit on number of error messages produced by one assemble operation.
+    // Read limit on number of error messages produced by one assemble operation.
-       private static int getErrorLimit() {
+    private static int getErrorLimit() {
-         return getIntegerProperty(configPropertiesFile, "ErrorLimit", 200);
+        return getIntegerProperty(configPropertiesFile, "ErrorLimit", 200);
-      }
+    }
 
-   	// Read backstep limit (number of operations to buffer) from properties file.
+    // Read backstep limit (number of operations to buffer) from properties file.
-       private static int getBackstepLimit() {
+    private static int getBackstepLimit() {
-         return getIntegerProperty(configPropertiesFile, "BackstepLimit", 1000);
+        return getIntegerProperty(configPropertiesFile, "BackstepLimit", 1000);
-      } 
+    }
 
-   	// Read ASCII default display character for non-printing characters, from properties file.
+    // Read ASCII default display character for non-printing characters, from properties file.
-       public static String getAsciiNonPrint() {
+    public static String getAsciiNonPrint() {
-		   String anp = getPropertyEntry(configPropertiesFile, "AsciiNonPrint");
+        String anp = getPropertyEntry(configPropertiesFile, "AsciiNonPrint");
-			return (anp == null) ? "." : ( (anp.equals("space")) ? " " : anp );
+        return (anp == null) ? "." : ((anp.equals("space")) ? " " : anp);
-      }    
+    }
 
-   	// Read ASCII strings for codes 0-255, from properties file. If string
+    // Read ASCII strings for codes 0-255, from properties file. If string
-		// value is "null", substitute value of ASCII_NON_PRINT.  If string is
+    // value is "null", substitute value of ASCII_NON_PRINT.  If string is
-		// "space", substitute string containing one space character.
+    // "space", substitute string containing one space character.
-       public static String[] getAsciiStrings() {
+    public static String[] getAsciiStrings() {
-		   String let = getPropertyEntry(configPropertiesFile,"AsciiTable");
+        String let = getPropertyEntry(configPropertiesFile, "AsciiTable");
-		   String placeHolder = getAsciiNonPrint();
+        String placeHolder = getAsciiNonPrint();
-			String[] lets = let.split(" +");			
+        String[] lets = let.split(" +");
-			int maxLength = 0;
+        int maxLength = 0;
-			for (int i = 0; i < lets.length; i++) {
+        for (int i = 0; i < lets.length; i++) {
-			    if (lets[i].equals("null")) lets[i] = placeHolder;
+            if (lets[i].equals("null")) lets[i] = placeHolder;
-				 if (lets[i].equals("space")) lets[i] = " ";
+            if (lets[i].equals("space")) lets[i] = " ";
-				 if (lets[i].length() > maxLength) maxLength = lets[i].length();
+            if (lets[i].length() > maxLength) maxLength = lets[i].length();
-			}
+        }
-			String padding = "        ";
+        String padding = "        ";
-			maxLength++;
+        maxLength++;
-			for (int i = 0; i < lets.length; i++) {
+        for (int i = 0; i < lets.length; i++) {
-             lets[i] = padding.substring(0,maxLength-lets[i].length()) + lets[i];
+            lets[i] = padding.substring(0, maxLength - lets[i].length()) + lets[i];
-			}
+        }
-			return lets;
+        return lets;
-      }   
+    }
 
-      // Read and return integer property value for given file and property name.
+    // Read and return integer property value for given file and property name.
-   	// Default value is returned if property file or name not found.
+    // Default value is returned if property file or name not found.
-       private static int getIntegerProperty(String propertiesFile, String propertyName, int defaultValue) {
+    private static int getIntegerProperty(String propertiesFile, String propertyName, int defaultValue) {
-         int limit = defaultValue;  // just in case no entry is found
+        int limit = defaultValue;  // just in case no entry is found
-         Properties properties = PropertiesFile.loadPropertiesFromFile(propertiesFile);
+        Properties properties = PropertiesFile.loadPropertiesFromFile(propertiesFile);
-         try {
+        try {
             limit = Integer.parseInt(properties.getProperty(propertyName, Integer.toString(defaultValue)));
-         } 
+        } catch (NumberFormatException nfe) {
-             catch (NumberFormatException nfe) { } // do nothing, I already have a default
+        } // do nothing, I already have a default
-         return limit;
+        return limit;
-      }
+    }
 
 
-   	// Read assembly language file extensions from properties file.  Resulting
+    // Read assembly language file extensions from properties file.  Resulting
-   	// string is tokenized into array list (assume StringTokenizer default delimiters).
+    // string is tokenized into array list (assume StringTokenizer default delimiters).
-       private static ArrayList getFileExtensions() {
+    private static ArrayList getFileExtensions() {
-         ArrayList extensionsList = new ArrayList();
+        ArrayList extensionsList = new ArrayList();
-         String extensions = getPropertyEntry(configPropertiesFile,"Extensions");
+        String extensions = getPropertyEntry(configPropertiesFile, "Extensions");
-         if (extensions != null) {
+        if (extensions != null) {
             StringTokenizer st = new StringTokenizer(extensions);
             while (st.hasMoreTokens()) {
-               extensionsList.add(st.nextToken()); 
+                extensionsList.add(st.nextToken());
             }
-         }
+        }
-         return extensionsList;
+        return extensionsList;
-      }
+    }
 
-      /**
+    /**
-   	 * Get list of MarsTools that reside outside the MARS distribution. 
+     * Get list of MarsTools that reside outside the MARS distribution.
-   	 * Currently this is done by adding the tool's path name to the list
+     * Currently this is done by adding the tool's path name to the list
-   	 * of values for the external_tools property. Use ";" as delimiter!
+     * of values for the external_tools property. Use ";" as delimiter!
-   	 * @return ArrayList.  Each item is file path to .class file
+     *
-   	 * of a class that implements MarsTool.  If none, returns empty list.
+     * @return ArrayList.  Each item is file path to .class file
-   	 */
+     * of a class that implements MarsTool.  If none, returns empty list.
-       public static ArrayList getExternalTools() {
+     */
-         ArrayList toolsList = new ArrayList();
+    public static ArrayList getExternalTools() {
-         String delimiter = ";";
+        ArrayList toolsList = new ArrayList();
-         String tools = getPropertyEntry(configPropertiesFile,"ExternalTools");
+        String delimiter = ";";
-         if (tools != null) {
+        String tools = getPropertyEntry(configPropertiesFile, "ExternalTools");
+        if (tools != null) {
             StringTokenizer st = new StringTokenizer(tools, delimiter);
             while (st.hasMoreTokens()) {
-               toolsList.add(st.nextToken()); 
+                toolsList.add(st.nextToken());
             }
-         }
+        }
-         return toolsList;
+        return toolsList;
-      }
+    }
 
-   	/**
+    /**
-   	 * Read and return property file value (if any) for requested property.
+     * Read and return property file value (if any) for requested property.
-   	 * @param propertiesFile  name of properties file (do NOT include filename extension,
+     *
-   	 * which is assumed to be ".properties")
+     * @param propertiesFile name of properties file (do NOT include filename extension,
-   	 * @param propertyName String containing desired property name
+     *                       which is assumed to be ".properties")
-   	 * @return String containing associated value; null if property not found
+     * @param propertyName   String containing desired property name
-   	 */
+     * @return String containing associated value; null if property not found
-       public static String getPropertyEntry(String propertiesFile, String propertyName) {
+     */
-         return PropertiesFile.loadPropertiesFromFile(propertiesFile).getProperty(propertyName);
+    public static String getPropertyEntry(String propertiesFile, String propertyName) {
-      }
+        return PropertiesFile.loadPropertiesFromFile(propertiesFile).getProperty(propertyName);
+    }
 
-   	/**
+    /**
-   	 * Read any syscall number assignment overrides from config file.
+     * Read any syscall number assignment overrides from config file.
-   	 * @return ArrayList of SyscallNumberOverride objects
+     *
-   	 */
+     * @return ArrayList of SyscallNumberOverride objects
-       public ArrayList getSyscallOverrides() {
+     */
-         ArrayList overrides = new ArrayList();
+    public ArrayList getSyscallOverrides() {
-         Properties properties = PropertiesFile.loadPropertiesFromFile(syscallPropertiesFile);
+        ArrayList overrides = new ArrayList();
-         Enumeration keys = properties.keys();
+        Properties properties = PropertiesFile.loadPropertiesFromFile(syscallPropertiesFile);
-         while (keys.hasMoreElements()) {
+        Enumeration keys = properties.keys();
+        while (keys.hasMoreElements()) {
             String key = (String) keys.nextElement();
-            overrides.add(new SyscallNumberOverride(key,properties.getProperty(key)));
+            overrides.add(new SyscallNumberOverride(key, properties.getProperty(key)));
-         }
+        }
-         return overrides;
+        return overrides;
-      }
+    }
 
-   }
+}

src/main/java/mars/mips/hardware/Memory.java

@@ -1,9 +1,13 @@
-   package mars.mips.hardware;
+package mars.mips.hardware;
-   import mars.*;
+
-   import mars.util.*;
+import mars.Globals;
-   import mars.simulator.*;
+import mars.ProgramStatement;
-   import mars.mips.instructions.*;
+import mars.Settings;
-   import java.util.*;
+import mars.mips.instructions.Instruction;
+import mars.simulator.Exceptions;
+import mars.util.Binary;
+
+import java.util.*;
 	
 	/*
 Copyright (c) 2003-2009,  Pete Sanderson and Kenneth Vollmar
@@ -768,11 +772,11 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
             value = fetchWordOrNullFromTable(stackBlockTable, relative);
          }
          else if (inTextSegment(address) || inKernelTextSegment(address)) {
-            try { 
+             try {
-               value = (getStatementNoNotify(address) == null) ? null : new Integer(getStatementNoNotify(address).getBinaryStatement());
+                 value = (getStatementNoNotify(address) == null) ? null : getStatementNoNotify(address).getBinaryStatement();
-            } 
+             } catch (AddressErrorException aee) {
-                catch (AddressErrorException aee) { 
+                 value = null;
-                  value = null;               }
+             }
          }  
          else if (inKernelDataSegment(address)) {
               // in kernel data segment
@@ -1382,7 +1386,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
          else {
             value = blockTable[block][offset];
          }
-         return new Integer(value);
+           return value;
       }
    	   
    ////////////////////////////////////////////////////////////////////////////////////

src/main/java/mars/mips/instructions/InstructionSet.java

@@ -1,11 +1,25 @@
-   package mars.mips.instructions;
+package mars.mips.instructions;
-   import mars.simulator.*;
+
-   import mars.mips.hardware.*;
+import mars.Globals;
-   import mars.mips.instructions.syscalls.*;
+import mars.ProcessingException;
-   import mars.*;
+import mars.ProgramStatement;
-   import mars.util.*;
+import mars.mips.hardware.AddressErrorException;
-   import java.util.*;
+import mars.mips.hardware.Coprocessor0;
-   import java.io.*;
+import mars.mips.hardware.Coprocessor1;
+import mars.mips.hardware.RegisterFile;
+import mars.mips.instructions.syscalls.Syscall;
+import mars.simulator.DelayedBranch;
+import mars.simulator.Exceptions;
+import mars.util.Binary;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.StringTokenizer;
 	
 	/*
 Copyright (c) 2003-2013,  Pete Sanderson and Kenneth Vollmar
@@ -1672,7 +1686,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
                         round = Integer.MAX_VALUE;
                      } 
                      else {
-                        Float floatObj = new Float(floatValue);
+                         Float floatObj = floatValue;
                         // If we are EXACTLY in the middle, then round to even!  To determine this,
                         // find next higher integer and next lower integer, then see if distances 
                         // are exactly equal.
@@ -1920,7 +1934,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
                         round = Integer.MAX_VALUE;
                      } 
                      else {
-                        Double doubleObj = new Double(doubleValue);
+                         Double doubleObj = doubleValue;
                         // If we are EXACTLY in the middle, then round to even!  To determine this,
                         // find next higher integer and next lower integer, then see if distances 
                         // are exactly equal.

src/main/java/mars/mips/instructions/syscalls/SyscallPrintFloat.java

@@ -1,7 +1,9 @@
-   package mars.mips.instructions.syscalls;
+package mars.mips.instructions.syscalls;
-   import mars.util.*;
+
-   import mars.mips.hardware.*;
+import mars.ProcessingException;
-   import mars.*;
+import mars.ProgramStatement;
+import mars.mips.hardware.Coprocessor1;
+import mars.util.SystemIO;
 
 /*
 Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
@@ -45,11 +47,11 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
          super(2, "PrintFloat");
       }
 
-   /**
+    /**
-   * Performs syscall function to display float whose bits are stored in $f12
+     * Performs syscall function to display float whose bits are stored in $f12
-   */
+     */
-       public void simulate(ProgramStatement statement) throws ProcessingException {
+    public void simulate(ProgramStatement statement) throws ProcessingException {
-         SystemIO.printString(new Float(Float.intBitsToFloat(
+        SystemIO.printString(Float.toString(Float.intBitsToFloat(
-                                Coprocessor1.getValue(12))).toString());
+                Coprocessor1.getValue(12))));
-      }
+    }
-   }
+}

src/main/java/mars/mips/instructions/syscalls/SyscallPrintInt.java

@@ -1,7 +1,9 @@
-   package mars.mips.instructions.syscalls;
+package mars.mips.instructions.syscalls;
-   import mars.util.*;
+
-   import mars.mips.hardware.*;
+import mars.ProcessingException;
-   import mars.*;
+import mars.ProgramStatement;
+import mars.mips.hardware.RegisterFile;
+import mars.util.SystemIO;
 
 /*
 Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
@@ -50,7 +52,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    * Performs syscall function to print on the console the integer stored in $a0.
    */
        public void simulate(ProgramStatement statement) throws ProcessingException {
-         SystemIO.printString(
+           SystemIO.printString(
-             new Integer(RegisterFile.getValue(4)).toString());
+                   Integer.toString(RegisterFile.getValue(4)));
-      }
+       }
    }

src/main/java/mars/tools/DigitalLabSim.java

@@ -1,17 +1,18 @@
 package mars.tools;
-import java.awt.*;
-import java.awt.event.*;
-import java.util.*;
-
-import javax.swing.*;
-import javax.swing.Timer;
 
 import mars.Globals;
 import mars.mips.hardware.AddressErrorException;
 import mars.mips.hardware.Coprocessor0;
 import mars.mips.hardware.Memory;
 import mars.mips.hardware.MemoryAccessNotice;
-import mars.simulator.Exceptions;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.util.Observable;
 @SuppressWarnings("serial")
 /* Add these two lines in exceptions.java file
  * public static final int EXTERNAL_INTERRUPT_TIMER = 0x00000100; //Add for digital Lab Sim
@@ -19,7 +20,7 @@ import mars.simulator.Exceptions;
 */
 
 /*
- * Didier Teifreto LIFC Université de franche-Comté www.lifc.univ-fcomte.fr/~teifreto
+ * Didier Teifreto LIFC Université de franche-Comté www.lifc.univ-fcomte.fr/~teifreto
  * didier.teifreto@univ-fcomte.fr
  */
 public class DigitalLabSim extends AbstractMarsToolAndApplication {

src/main/java/mars/tools/MipsXray.java

@@ -1,62 +1,5 @@
 package mars.tools;
 
-import java.awt.BorderLayout;
-import java.awt.Color;
-import java.awt.Component;
-import java.awt.Container;
-import java.awt.Cursor;
-import java.awt.Dimension;
-import java.awt.Font;
-import java.awt.Graphics;
-import java.awt.Graphics2D;
-import java.awt.GraphicsConfiguration;
-import java.awt.GraphicsDevice;
-import java.awt.GraphicsEnvironment;
-import java.awt.GridBagLayout;
-import java.awt.Image;
-import java.awt.MouseInfo;
-import java.awt.Point;
-import java.awt.PointerInfo;
-import java.awt.RenderingHints;
-import java.awt.Toolkit;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
-import java.awt.event.KeyEvent;
-import java.awt.event.MouseAdapter;
-import java.awt.event.MouseEvent;
-import java.awt.event.MouseListener;
-import java.awt.font.FontRenderContext;
-import java.awt.font.TextLayout;
-import java.awt.image.BufferedImage;
-import java.io.IOException;
-import java.text.DecimalFormat;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Observable;
-import java.util.Vector;
-
-import javax.imageio.ImageIO;
-import javax.swing.Action;
-import javax.swing.ImageIcon;
-import javax.swing.JButton;
-import javax.swing.JComponent;
-import javax.swing.JLabel;
-import javax.swing.JOptionPane;
-import javax.swing.JPanel;
-import javax.swing.JToolBar;
-import javax.swing.KeyStroke;
-import javax.swing.SwingUtilities;
-import javax.swing.Timer;
-import javax.swing.UIManager;
-//import java.util.Timer;
-import javax.swing.event.InternalFrameEvent;
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
-
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.NodeList;
-
 import mars.Globals;
 import mars.ProgramStatement;
 import mars.mips.hardware.AccessNotice;
@@ -69,6 +12,25 @@ import mars.venus.RunAssembleAction;
 import mars.venus.RunBackstepAction;
 import mars.venus.RunStepAction;
 import mars.venus.VenusUI;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+
+import javax.imageio.ImageIO;
+import javax.swing.*;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.awt.*;
+import java.awt.event.*;
+import java.awt.font.FontRenderContext;
+import java.awt.font.TextLayout;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.text.DecimalFormat;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Observable;
+import java.util.Vector;
 
 public class MipsXray extends AbstractMarsToolAndApplication{
 	private static final long serialVersionUID = -1L;
@@ -117,31 +79,30 @@ public class MipsXray extends AbstractMarsToolAndApplication{
     	  *  Overrides default method, to provide a Help button for this tool/app.
     	  */
         protected JComponent getHelpComponent() {
-          final String helpContent = 
+            final String helpContent =
-                              "This plugin is used to visualizate the behavior of mips processor using the default datapath. \n"+
+                    "This plugin is used to visualizate the behavior of mips processor using the default datapath. \n" +
-                              "It reads the source code instruction and generates an animation representing the inputs and \n"+
+                            "It reads the source code instruction and generates an animation representing the inputs and \n" +
-             						"outputs of functional blocks and the interconnection between them.  The basic signals \n"+
+                            "outputs of functional blocks and the interconnection between them.  The basic signals \n" +
-             						"represented are, control signals, opcode bits and data of functional blocks.\n"+
+                            "represented are, control signals, opcode bits and data of functional blocks.\n" +
-             						"\n"+
+                            "\n" +
-             						"Besides the datapath representation, information for each instruction is displayed below\n"+
+                            "Besides the datapath representation, information for each instruction is displayed below\n" +
-             						"the datapath. That display includes opcode value, with the correspondent colors used to\n"+
+                            "the datapath. That display includes opcode value, with the correspondent colors used to\n" +
-             						"represent the signals in datapath, mnemonic of the instruction processed at the moment, registers\n"+
+                            "represent the signals in datapath, mnemonic of the instruction processed at the moment, registers\n" +
-             						"used in the instruction and a label that indicates the color code used to represent control signals\n" +
+                            "used in the instruction and a label that indicates the color code used to represent control signals\n" +
-             						"\n"+
+                            "\n" +
-										"To see the datapath of register bank and control units click inside the functional unit.\n\n" +
+                            "To see the datapath of register bank and control units click inside the functional unit.\n\n" +
-             						"Version 2.0\n" + 
+                            "Version 2.0\n" +
-             						"Developed by Márcio Roberto, Guilherme Sales, Fabrício Vivas, Flávio Cardeal and Fábio Lúcio\n" +
+                            "Developed by Márcio Roberto, Guilherme Sales, Fabrício Vivas, Flávio Cardeal and Fábio Lúcio\n" +
-             						"Contact Marcio Roberto at marcio.rdaraujo@gmail.com with questions or comments.\n"
+                            "Contact Marcio Roberto at marcio.rdaraujo@gmail.com with questions or comments.\n";
-             						;
+            JButton help = new JButton("Help");
-          JButton help = new JButton("Help");
+            help.addActionListener(
-          help.addActionListener(
+                    new ActionListener() {
-                 new ActionListener() {
+                        public void actionPerformed(ActionEvent e) {
-                    public void actionPerformed(ActionEvent e) {
+                            JOptionPane.showMessageDialog(theWindow, helpContent);
-                      JOptionPane.showMessageDialog(theWindow, helpContent);
+                        }
-                   }
+                    });
-                });		
+            return help;
-          return help;  
+        }
-       }
      /**
    	 *  Implementation of the inherited abstract method to build the main 
    	 *  display area of the GUI.  It will be placed in the CENTER area of a 

src/main/java/mars/venus/MessagesPane.java

@@ -1,15 +1,22 @@
-   package mars.venus;
+package mars.venus;
-   import mars.*;
+
-   import javax.swing.*;
+import mars.ErrorList;
-   import javax.swing.text.*;
+import mars.Globals;
-   import java.awt.*;
+import mars.simulator.Simulator;
-   import java.awt.event.*;
+
-   import java.util.concurrent.ArrayBlockingQueue;
+import javax.swing.*;
-   import javax.swing.event.DocumentListener;
+import javax.swing.event.DocumentEvent;
-   import javax.swing.undo.UndoableEdit;
+import javax.swing.event.DocumentListener;
-   import mars.simulator.Simulator;
+import javax.swing.text.BadLocationException;
-   import javax.swing.event.DocumentEvent;
+import javax.swing.text.NavigationFilter;
-   import javax.swing.text.Position.Bias;
+import javax.swing.text.Position.Bias;
+import javax.swing.undo.UndoableEdit;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.concurrent.ArrayBlockingQueue;
 
 /*
 Copyright (c) 2003-2010,  Pete Sanderson and Kenneth Vollmar
@@ -375,19 +382,15 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
          return asker.response();
       }
 
-   	  ////////////////////////////////////////////////////////////////////////////
+    ////////////////////////////////////////////////////////////////////////////
-   	  // Thread class for obtaining user input in the Run I/O window (MessagesPane)
+    // Thread class for obtaining user input in the Run I/O window (MessagesPane)
-   	  // Written by Ricardo Fernández Pascual [rfernandez@ditec.um.es] December 2009.
+    // Written by Ricardo Fernández Pascual [rfernandez@ditec.um.es] December 2009.
-       class Asker implements Runnable {
+    class Asker implements Runnable {
-         ArrayBlockingQueue<String> resultQueue = new ArrayBlockingQueue<String>(1);
+        ArrayBlockingQueue<String> resultQueue = new ArrayBlockingQueue<String>(1);
-         int initialPos;
+        int initialPos;
-         int maxLen;
+        int maxLen;
-          Asker(int maxLen) {
+        final DocumentListener listener =
-            this.maxLen = maxLen;
+                new DocumentListener() {
-                // initialPos will be set in run()
-         }
-         final DocumentListener listener = 
-             new DocumentListener() {
                 public void insertUpdate(final DocumentEvent e) {
                   EventQueue.invokeLater(
                          new Runnable() {
@@ -430,6 +433,11 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
                }
                 public void changedUpdate(DocumentEvent e) { }
             };
+
+        Asker(int maxLen) {
+            this.maxLen = maxLen;
+            // initialPos will be set in run()
+        }
          final NavigationFilter navigationFilter = 
              new NavigationFilter() {
                 public void moveDot(FilterBypass fb, int dot, Bias bias) {