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