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   1 /**********************************************************************
   2 Copyright (c) 2000, 2002 IBM Corp. and others.
   3 All rights reserved. This program and the accompanying materials
   4 are made available under the terms of the Common Public License v1.0
   5 which accompanies this distribution, and is available at
   6 http://www.eclipse.org/legal/cpl-v10.html
   7
   8 Contributors:
   9         IBM Corporation - Initial implementation
  10         Vicente Fernando - www.alfersoft.com.ar
  11 **********************************************************************/
  12 package net.sourceforge.phpdt.internal.debug.core.model;
  13
  14 import java.util.Arrays;
  15 import java.util.Vector;
  16
  17 import net.sourceforge.phpdt.internal.debug.core.PHPDBGProxy;
  18
  19 import org.eclipse.debug.core.DebugEvent;
  20 import org.eclipse.debug.core.DebugException;
  21 import org.eclipse.debug.core.DebugPlugin;
  22 import org.eclipse.debug.core.ILaunch;
  23 import org.eclipse.debug.core.model.IDebugTarget;
  24 import org.eclipse.debug.core.model.IRegisterGroup;
  25 import org.eclipse.debug.core.model.IStackFrame;
  26 import org.eclipse.debug.core.model.IThread;
  27 import org.eclipse.debug.core.model.IVariable;
  28
  29 /**
  30  *
  31  * TODO Remove the variables array and use only the varList vector
  32  *      Have also to change hasVariables
  33  */
  34 public class PHPStackFrame extends PHPDebugElement implements IStackFrame, Comparable{
  35
  36         private PHPThread               thread;                         // The thread to which this stackframe belongs
  37         private String                  file;               // The file name???
  38         private int                     lineNumber;         //
  39         private int                     index;              //
  40         private int                     modno;              //
  41         private PHPVariable[]   variables;          // The array of variables TODO: better introduce a vector?
  42         private Vector          varList  = new Vector ();
  43         private String                  description;        // The source file name with the full path on target/remote system
  44         private boolean         fUpToDate;          //
  45
  46         /**
  47          *
  48          * @param thread
  49          * @param file
  50          * @param line
  51          * @param index
  52          * @param desc
  53          * @param modno
  54          */
  55         public PHPStackFrame (PHPThread thread, String file, int line, int index, String desc, int modno) {
  56                 super (null);
  57
  58                 this.lineNumber  = line;
  59                 this.index           = index;
  60                 this.file            = file;
  61                 this.thread      = thread;
  62                 this.description = desc;
  63                 this.modno               = modno;
  64                 this.fUpToDate   = false;
  65         }
  66
  67         /**
  68          *
  69          * @param thread
  70          * @param file
  71          * @param line
  72          * @param index
  73          */
  74         public PHPStackFrame (PHPThread thread, String file, int line, int index) {
  75                 super (null);
  76
  77                 this.lineNumber = line;
  78                 this.index              = index;
  79                 this.file               = file;
  80                 this.thread     = thread;
  81                 this.fUpToDate  = false;
  82         }
  83
  84         /**
  85          *
  86          */
  87         public IThread getThread () {
  88                 return thread;
  89         }
  90
  91         /**
  92          * @param thread
  93          */
  94         public void setThread (PHPThread thread) {
  95                 this.thread = thread;
  96         }
  97
  98         /**
  99          *
 100          */
 101         private void setUpToDate (boolean upToDate) {
 102                 fUpToDate = upToDate;
 103         }
 104
 105         /**
 106          *
 107          */
 108         private boolean isUpToDate () {
 109                 return fUpToDate;
 110         }
 111
 112         /**
 113          *
 114          *
 115          */
 116         private void resetHasChangedInfo (Vector varList) {
 117                 int             n;
 118                 PHPVariable var;
 119                 PHPValue    val;
 120
 121                 for (n = 0; n < varList.size (); n++) {                  // For every variable in 'DBG list'
 122                         var = (PHPVariable) varList.get (n);                    // Get the variable
 123                         val = (PHPValue) var.getValue ();                       // Get the variable's value
 124
 125                         try {
 126                                 if (val.hasVariables ()) {                              // Do we have other variables within the value
 127                                         if (!hasRecursion (var)) {                          // Is this variable (value) branch recursive?
 128                                                 resetHasChangedInfo (val.getChildVariables ()); //  No, go into branch
 129                                         }
 130                                 }
 131                         }
 132                         catch (DebugException e) {                                                  // That's, because of the hasVariables method
 133                         }
 134
 135                         var.setValueChanged (false);                            // Reset the 'has changed' flag
 136                 }
 137         }
 138
 139         /**
 140          * Go up the tree of PHPVariables
 141          * look whether the PHPValue is a reference to a parent PHPValue
 142          *
 143          * TODO Check where this recursion can come from.
 144          * Whether this back reference is legal or a bug.
 145          *
 146          * @param var
 147          * @return
 148          * <ul>
 149          * <li> false if the PHPValue is not a child of itself
 150          * <li> true if the PHPValue is
 151          * </ul>
 152          */
 153         private boolean hasRecursion (PHPVariable var) {
 154                 PHPVariable parentVar;
 155                 PHPValue    val;
 156
 157                 val = (PHPValue) var.getValue ();                                                       // Get the PHPValue from the current PHPVariable
 158
 159                 while (var != null) {                                                                           // As long as we have PHPVariable
 160                         parentVar = var.getParent ();                                                   // Get the parent PHPVariable
 161
 162                         if (parentVar != null) {                                // Is there a parent?
 163                                 if (parentVar.getValue ().equals (val)) {                       // Get the PHPValue for the parent PHPVariable and check
 164                                                                                                                                         // whether it is the same
 165                                         return true;                                                                    // Return, if we have recursion
 166                                 }
 167                         }
 168
 169                         var = parentVar;
 170                 }
 171
 172                 return false;                                                                                           // No recursion found
 173         }
 174
 175         /**
 176          * This method updates the 'static' variables list.
 177          * It does a replication between the 'static' list (the variable list which
 178          * is a member of this DBG interface object) and the DBG variable list
 179          * (the list of variables which is received from PHP via DBG with the current suspend)
 180          * Replication is done in the following way:
 181          * <ul>
 182          * <li> It looks for new variables within the DBG variables list and
 183          *      adds them to the 'static' list.
 184          * <li> It looks for changed variables copies the current value to the variable within
 185          *              the 'static list' and mark these variables as 'hasChanged' (which uses the UI
 186          *              for showing the variable with a different color).
 187          * <li> It looks for variables within the 'static' list, and removes them
 188          *              from the 'static' list in case the do not appear within the DBG list.
 189          * </ul>
 190          *
 191          * @param varListOld The 'static' list of variables which are to be updated.
 192          * @param varListNew The new list of (current) variables from DBG.
 193          */
 194         private void updateVariableList (Vector varListOld, Vector varListNew)
 195         {
 196                 PHPVariable     varOld;                                                                                 // The variable from the 'static' list
 197                 PHPVariable varNew;                                                                                     // The variable from the DBG list
 198                 PHPValue    valOld;                                                                                     // The value of the current variable from 'static' list
 199                 PHPValue    valNew;                                                                                     // The value of the current variable from DBG list
 200                 int         n;                                                                                          // Index for the DBG list
 201                 int         o;                                                                                          // Index for the static list
 202
 203                 // Add the variables (and childs) to the static list if they are new
 204                 //  and update the values of variables which are already existend within
 205                 //  the 'static' list.
 206
 207                 for (n = 0; n < varListNew.size (); n++) {                  // For every variable in 'DBG list'
 208                         varNew = (PHPVariable) varListNew.get (n);                              // Get the DBG variable
 209
 210                         for (o = 0; o < varListOld.size (); o++) {                              // For every variable in static list
 211                                 varOld = (PHPVariable) varListOld.get (o);                      // Get the static variable
 212
 213                                 if (varNew.getName ().equals (varOld.getName ())) { // Did we found the variable within the 'static' list?
 214                                         valOld = (PHPValue) varOld.getValue ();         // Get the value from 'static'
 215                                         valNew = (PHPValue) varNew.getValue ();         // Get the value from DBG
 216
 217                                         try {
 218                                                 if (valOld.hasVariables () ||                           // If the 'static' value has child variables
 219                                                         valNew.hasVariables ()) {                               //  or if the DBG value has child variables
 220                                                         if (!hasRecursion (varOld) &&
 221                                                                 !hasRecursion (varNew)) {                       // Both branches should not have a recursion
 222                                                                 updateVariableList (valOld.getChildVariables (),        // Update the variable list for the child variables
 223                                                                                                         valNew.getChildVariables ());
 224                                                         }
 225                                                 }
 226                                                 else if (!valOld.getValueString ().equals (valNew.getValueString ())) { // Has the value changed?
 227                                                         valOld.setValueString (valNew.getValueString ());                   // Yes, set the 'static' value (variable) to the new value
 228                                                         varOld.setValueChanged (true);                                                                          // and set the 'has changed' flag, so that the variable view
 229                                                                                                                                                                                                 // could show the user the changed status with a different
 230                                                                                                                                                                                                 // color
 231                                                 }
 232                                                 //else {
 233                                                 //      varOld.setValueChanged (false);                                     // Reset the 'has changed' flag
 234                                                 //}
 235                                         }
 236                                         catch (DebugException e) {                                                  // That's, because of the hasVariables method
 237                                         }
 238
 239                                         break;                                          // Found the variable,
 240                                 }
 241                         }
 242
 243                         if (o == varListOld.size ()) {                          // Did we found the variable within the static list?
 244                                 varListOld.add (varNew);                                                        //  No, then add the DBG variable to the static list
 245                         }
 246                 }
 247
 248                 // Look for the variables we can remove from the 'static' list
 249
 250                 for (o = 0; o < varListOld.size (); o++) {                                              // For every variable in 'static' list
 251                         varOld = (PHPVariable) varListOld.get (o);                                                      // Get the static variable
 252
 253                         for (n = 0; n < varListNew.size (); n++) {                                                      // For all variables in 'DBG' list
 254                                 varNew = (PHPVariable) varListNew.get (n);                                              // Get the variable from the 'DBG' list
 255
 256                                 if (varNew.getName ().equals (varOld.getName ())) {                     // Did we found the 'static' list variable within the 'DBG' list?
 257                                         break;                                                                                                          // Yes we found the variable, then leave the loop
 258                                 }
 259                         }
 260
 261                         if (n == varListNew.size ()) {                                          // Did not find the 'static' list variable within the 'DBG' list?
 262                                  varListOld.remove (o);                                         // then remove the 'static' list variable from list
 263                                  o -= 1;                                                        // Adjust the 'static' list index
 264                         }
 265                 }
 266         }
 267
 268
 269         /**
 270          *
 271          * This function returns the array of PHPVariables for this stackframe
 272          * The PHPVariables should not change (newly build up) between two steps
 273          * (or breaks).
 274          * A PHPVariable with the same name but with different object ID is
 275          * handled as a new variable.
 276          *
 277          * TODO Remove the intermediate storage array
 278          *
 279          * @return The array of PHPVariables for this stackframe.
 280          */
 281         public IVariable[] getVariables() throws DebugException {
 282                 PHPVariable[] variablesNew;                                 // The intermediate storage of the variable array we get from DBG proxy
 283
 284                 //variablesNew = this.getPHPDBGProxy ().readVariables (this); // Get the variable array from DBG proxy
 285                 //variables    = variablesNew;                                // Store the array the stackframes member variable
 286
 287                 if (!isUpToDate ()) {
 288                         resetHasChangedInfo (varList);
 289                         updateVariableList (varList, this.getPHPDBGProxy ().readVariables (this));
 290                         setUpToDate (true);
 291
 292                         variables = (PHPVariable[]) varList.toArray (new PHPVariable[varList.size ()]);
 293                         Arrays.sort(variables, new PHPVariableComparator());
 294                 }
 295
 296                 return variables;                                           // Give the array back to user interface
 297         }
 298
 299         /**
 300          *
 301          */
 302         private PHPVariable findVariable (Vector varList, String varname) {
 303                 PHPVariable     variable;
 304                 PHPValue        value;
 305                 int                     i;
 306
 307                 for (i = 0; i < varList.size (); i++) {                                         // For all variables
 308                         variable = (PHPVariable) varList.get (i);                               // Get the variable
 309                         value    = (PHPValue) variable.getValue ();                             // Get the value of the variable
 310
 311                         try {
 312                                 if (value.hasVariables ()) {                                            // Does the variable/value have children
 313                                         if (!hasRecursion (variable)) {                                 // Don't follow recursive variable/values
 314                                                 variable = findVariable (value.getChildVariables (), varname);
 315
 316                                                 if (variable != null) {
 317                                                         return variable;
 318                                                 }
 319                                         }
 320                                 }
 321                                 else if ((variable.getName ()).equals (varname)) {      //
 322                                         return variable;                                                                //
 323                                 }
 324                         }
 325                         catch (DebugException e) {                                                              // That's, because of the hasVariables method
 326                         }
 327                 }
 328
 329                 return null;
 330         }
 331
 332         /**
 333          * This method is called from the UI (e.g. from PHPDebugHover
 334          * to find the variable the mouse is pointing to)
 335          *
 336          * @param s The variable name we are looking for.
 337          * @return
 338          */
 339         public IVariable findVariable (String s) throws DebugException {
 340                 if (!isUpToDate ()) {
 341                         resetHasChangedInfo (varList);
 342                         updateVariableList (varList, this.getPHPDBGProxy ().readVariables (this));
 343                         setUpToDate (true);
 344
 345                         variables = (PHPVariable[]) varList.toArray (new PHPVariable[varList.size ()]);
 346                 }
 347
 348                 return (findVariable (varList, s));                                                     // Prefix the variable name with $
 349         }
 350
 351         /**
 352          *
 353          */
 354         public boolean hasVariables () throws DebugException {
 355                 return (varList.size () > 0);
 356         }
 357
 358         public int getLineNumber() {
 359                 return lineNumber;
 360         }
 361
 362         public void setLineNumber(int line) {
 363                 lineNumber = line;
 364         }
 365
 366         public int getCharStart() throws DebugException {
 367                 // not supported
 368                 return -1;
 369         }
 370
 371         public int getCharEnd() throws DebugException {
 372                 // not supported
 373                 return -1;
 374         }
 375
 376         public String getName() {
 377                 StringBuffer name = new StringBuffer();
 378
 379                 if (!this.getDescription().equals ("")) {
 380                         name.append (this.getDescription ());
 381                 }
 382                 else {
 383                         name.append (this.getFileName ());
 384                 }
 385
 386                 name.append (" [line ");
 387                 name.append (this.getLineNumber ());
 388                 name.append ("]");
 389
 390                 return name.toString();
 391         }
 392
 393         public String getFileName() {
 394                 return file;
 395         }
 396
 397         public void setDescription(String desc) {
 398                 this.description= desc;
 399         }
 400
 401         public String getDescription() {
 402                 return this.description;
 403         }
 404
 405         public IRegisterGroup[] getRegisterGroups() throws DebugException {
 406                 return null;
 407         }
 408
 409         public boolean hasRegisterGroups() throws DebugException {
 410                 return false;
 411         }
 412
 413         public String getModelIdentifier() {
 414                 return this.getThread().getModelIdentifier();
 415         }
 416
 417         public IDebugTarget getDebugTarget() {
 418                 return this.getThread().getDebugTarget();
 419         }
 420
 421         public ILaunch getLaunch() {
 422                 return this.getDebugTarget().getLaunch();
 423         }
 424
 425         public boolean canStepInto() {
 426                 return canResume();
 427         }
 428
 429         public boolean canStepOver() {
 430                 return canResume();
 431         }
 432
 433         public boolean canStepReturn() {
 434                 return canResume();
 435         }
 436
 437         public boolean isStepping() {
 438                 return false;
 439         }
 440
 441         /**
 442          *
 443          */
 444         public void stepInto () throws DebugException {
 445                 DebugEvent      ev;
 446
 447                 setUpToDate (false);
 448
 449                 thread.prepareForResume (DebugEvent.STEP_INTO);             // Don't know why, but this is necessary
 450                 this.getPHPDBGProxy ().readStepIntoEnd (PHPStackFrame.this);
 451
 452                 ev = new DebugEvent (this.getThread (), DebugEvent.RESUME, DebugEvent.STEP_INTO);
 453                 DebugPlugin.getDefault().fireDebugEventSet (new DebugEvent[] { ev });
 454         }
 455
 456         /**
 457          *
 458          */
 459         public void stepOver () throws DebugException {
 460                 DebugEvent      ev;
 461
 462                 setUpToDate (false);
 463
 464                 thread.prepareForResume (DebugEvent.STEP_OVER);
 465                 this.getPHPDBGProxy ().readStepOverEnd (PHPStackFrame.this) ;
 466
 467                 ev = new DebugEvent (this.getThread (), DebugEvent.RESUME, DebugEvent.STEP_OVER);
 468                 DebugPlugin.getDefault ().fireDebugEventSet (new DebugEvent[] { ev });
 469         }
 470
 471         /**
 472          *
 473          */
 474         public void stepReturn () throws DebugException {
 475                 DebugEvent      ev;
 476
 477                 setUpToDate (false);
 478
 479                 thread.prepareForResume (DebugEvent.STEP_RETURN);
 480                 this.getPHPDBGProxy ().readStepReturnEnd (PHPStackFrame.this) ;
 481
 482                 ev = new DebugEvent (this.getThread (), DebugEvent.RESUME, DebugEvent.STEP_RETURN);
 483                 DebugPlugin.getDefault ().fireDebugEventSet (new DebugEvent[] { ev });
 484         }
 485
 486
 487         public boolean canResume() {
 488                 return this.getThread().canResume();
 489         }
 490
 491         public boolean canSuspend() {
 492                 return this.getThread().canSuspend();
 493         }
 494
 495         public boolean isSuspended() {
 496                 return this.getThread().isSuspended();
 497         }
 498
 499         public void resume() throws DebugException {
 500                 setUpToDate (false);
 501                 this.getThread().resume();
 502         }
 503
 504         public void suspend() throws DebugException {
 505         }
 506
 507         public boolean canTerminate() {
 508                 return this.getThread().canTerminate();
 509         }
 510
 511         public boolean isTerminated() {
 512                 return this.getThread().isTerminated();
 513         }
 514
 515         public void terminate() throws DebugException {
 516                 getPHPDBGProxy().stop();
 517         }
 518
 519         public int getIndex() {
 520                 return index;
 521         }
 522
 523         public void setIndex (int index) {
 524                 this.index = index;
 525         }
 526
 527         public PHPDBGProxy getPHPDBGProxy() {
 528                 PHPDebugTarget DebugTarget;
 529
 530                 DebugTarget = (PHPDebugTarget) thread.getDebugTarget ();
 531
 532                 return DebugTarget.getPHPDBGProxy ();
 533         }
 534
 535         public void setFile(String file) {
 536                 this.file = file;
 537         }
 538
 539         public int getModNo() {
 540                 return modno;
 541         }
 542
 543         /**
 544          * This function is needed when sorting the stackframes by their index numbers.
 545          *
 546          * @param obj The stackframe which this one is compared to.
 547          * @return
 548          * <ul>
 549          * <li> -1 if the index of this stackframe is less.
 550          * <li> 0 if the index of both stackfream is equal (should no happen).
 551          * <li> 1 if the index of this stackfram is greater.
 552          * </ul>
 553          */
 554         public int compareTo (Object obj)
 555         {
 556                 if (index < ((PHPStackFrame) obj).getIndex ()) {
 557                         return -1;
 558                 }
 559                 else if (index > ((PHPStackFrame) obj).getIndex ()) {
 560                         return 1;
 561                 }
 562
 563                 return 0;
 564         }
 565 }