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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.Collections;
  15 import java.util.Vector;
  16
  17 import net.sourceforge.phpdt.internal.debug.core.PHPDBGProxy;
  18
  19 import org.eclipse.core.runtime.IAdaptable;
  20 import org.eclipse.debug.core.DebugEvent;
  21 import org.eclipse.debug.core.DebugException;
  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  */
  32 public class PHPStackFrame extends PHPDebugElement implements IStackFrame, Comparable {
  33
  34         private PHPThread               thread;                                 // The thread to which this stackframe belongs
  35         private String          file;                                   // The file name???
  36         private int                     lineNumber;
  37         private int                     index;
  38         private int                     modno;
  39         private int                     scope_id;                               // scope id
  40         private Vector          varList;                                // Variables list
  41         private String          description;                    // The source file name with the full path on target/remote system
  42         private boolean                 fUpToDate;                              // Indicates whether the variable list within this stackframe is
  43                                                                                                         // up-to-date
  44         private boolean                 fAvailable;                     // Needed when updating the stackframe list, shows whether the stackframe
  45                                                                                                         // is within the list which was received from dbg
  46
  47         /**
  48          *
  49          * @param thread
  50          * @param file
  51          * @param line
  52          * @param index
  53          * @param desc
  54          * @param modno
  55          * @param scope_id
  56          */
  57         public PHPStackFrame(PHPThread thread, String file, int line, int index,
  58                         String desc, int modno, int scope_id) {
  59                 super(null);
  60
  61                 this.lineNumber = line;
  62                 this.index = index;
  63                 this.file = file;
  64                 this.thread = thread;
  65                 this.description = desc;
  66                 this.modno = modno;
  67                 this.scope_id = scope_id;
  68                 this.varList = new Vector();
  69                 this.fUpToDate = false;
  70         }
  71
  72 //      /**
  73 //       *
  74 //       * @param thread
  75 //       * @param file
  76 //       * @param line
  77 //       * @param index
  78 //       */
  79 //      public PHPStackFrame(PHPThread thread, String file, int line, int index) {
  80 //              super(null);
  81 //
  82 //              this.lineNumber = line;
  83 //              this.index = index;
  84 //              this.file = file;
  85 //              this.thread = thread;
  86 //              this.fUpToDate = false;
  87 //      }
  88
  89         /**
  90          *
  91          * @return scope id
  92          */
  93         public int getScopeID() {
  94                 return scope_id;
  95         }
  96
  97         /**
  98          *
  99          */
 100         public void setScopeID(int scope_id) {
 101                 this.scope_id = scope_id;
 102                 fUpToDate = false;
 103         }
 104
 105         /**
 106          *
 107          */
 108         public IThread getThread() {
 109                 return thread;
 110         }
 111
 112         /**
 113          * @param thread
 114          */
 115         public void setThread(PHPThread thread) {
 116                 this.thread = thread;
 117         }
 118
 119 //      /**
 120 //       *
 121 //       */
 122 //      private void setUpToDate(boolean upToDate) {
 123 //              fUpToDate = upToDate;
 124 //      }
 125
 126 //      /**
 127 //       *
 128 //       */
 129 //      private boolean isUpToDate() {
 130 //              return fUpToDate;
 131 //      }
 132
 133         /**
 134          *
 135          */
 136         public void setAvailable(boolean available) {
 137                 fAvailable = available;
 138         }
 139
 140         /**
 141          *
 142          */
 143         public boolean isAvailable() {
 144                 return fAvailable;
 145         }
 146
 147         /**
 148          * @see IAdaptable#getAdapter(Class)
 149          */
 150         public Object getAdapter(Class adapter) {
 151                 if (adapter == PHPStackFrame.class) {
 152                         return this;
 153                 }
 154
 155                 return super.getAdapter(adapter);
 156         }
 157
 158         /**
 159          *
 160          */
 161         private void resetHasChangedInfo(Vector varList) {
 162                 int             n;
 163                 PHPVariable var;
 164                 PHPValue        val;
 165
 166                 for (n = 0; n < varList.size(); n++) {                                          // For every variable in 'DBG list'
 167                         var = (PHPVariable) varList.get(n);                                     // Get the variable
 168                         val = (PHPValue) var.getValue();                                                // Get the variable's value
 169
 170                         try {
 171                                 if (val.hasVariables()) {                                                       // Do we have other variables within the value
 172                                         if (!hasRecursion(var)) {                                               // Is this variable (value) branch recursive?
 173                                                 resetHasChangedInfo(val.getChildVariables()); //  No, go into branch
 174                                         }
 175                                 }
 176                         } catch (DebugException e) {                                                    // That's, because of the hasVariables method
 177                         }
 178
 179                         var.setValueChanged(false);                                                     // Reset the 'has changed' flag
 180                 }
 181         }
 182
 183         /**
 184          * Go up the tree of PHPVariables
 185          * look whether the PHPValue is a reference to a parent PHPValue
 186          *
 187          * TODO Check where this recursion can come from.
 188          * Whether this back reference is legal or a bug.
 189          *
 190          * Typically $GLOBALS contains $GLOBALS
 191          *
 192          * @param var
 193          * @return
 194          * <ul>
 195          * <li> false if the PHPValue is not a child of itself
 196          * <li> true if the PHPValue is
 197          * </ul>
 198          */
 199         private boolean hasRecursion(PHPVariable var) {
 200                 PHPVariable parentVar;
 201                 PHPValue        val;
 202
 203                 val = (PHPValue) var.getValue();                                                        // Get the PHPValue from the current PHPVariable
 204
 205                 while (var != null) {                                                                           // As long as we have PHPVariable
 206                         parentVar = var.getParent();                                                    // Get the parent PHPVariable
 207
 208                         if (parentVar != null) {                                                                // Is there a parent?
 209                                 if (parentVar.getValue().equals(val)) {                         // Get the PHPValue for the parent PHPVariable and check
 210                                                                                                                                         // whether it is the same
 211                                         return true;                                                                    // Return, if we have recursion
 212                                 }
 213                         }
 214
 215                         var = parentVar;
 216                 }
 217
 218                 return false;                                                                                           // No recursion found
 219         }
 220
 221         /**
 222          * This method updates the 'static' variables list.
 223          * It does a replication between the 'static' list (the variable list which
 224          * is a member of this DBG interface object) and the DBG variable list
 225          * (the list of variables which is received from PHP via DBG with the current suspend)
 226          * Replication is done in the following way:
 227          * <ul>
 228          * <li> It looks for new variables within the DBG variables list and
 229          *      adds them to the 'static' list.
 230          * <li> It looks for changed variables copies the current value to the variable within
 231          *              the 'static list' and mark these variables as 'hasChanged' (which uses the UI
 232          *              for showing the variable with a different color).
 233          * <li> It looks for variables within the 'static' list, and removes them
 234          *              from the 'static' list in case the do not appear within the DBG list.
 235          * </ul>
 236          *
 237          * @param varListOld The 'static' list of variables which are to be updated.
 238          * @param varListNew The new list of (current) variables from DBG.
 239          */
 240         private void updateVariableList(Vector varListOld, Vector varListNew) {
 241                 PHPVariable varOld;                                                                             // The variable from the 'static' list
 242                 PHPVariable varNew;                                                                             // The variable from the DBG list
 243                 PHPValue        valOld;                                                                                 // The value of the current variable from 'static' list
 244                 PHPValue        valNew;                                                                                 // The value of the current variable from DBG list
 245                 int             n;                                                                                              // Index for the DBG list
 246                 int             o;                                                                                              // Index for the static list
 247
 248                 // Add the variables (and childs) to the static list if they are new
 249                 //  and update the values of variables which are already existend within
 250                 //  the 'static' list.
 251
 252                 for (n = 0; n < varListNew.size(); n++) {                                       // For every variable in 'DBG list'
 253                         varNew = (PHPVariable) varListNew.get(n);                               // Get the DBG variable
 254
 255                         for (o = 0; o < varListOld.size(); o++) {                               // For every variable in static list
 256                                 varOld = (PHPVariable) varListOld.get(o);                       // Get the static variable
 257
 258                                 if (varNew.getName().equals(varOld.getName())) {        // Did we found the variable within the 'static' list?
 259                                         valOld = (PHPValue) varOld.getValue();                  // Get the value from 'static'
 260                                         valNew = (PHPValue) varNew.getValue();                  // Get the value from DBG
 261
 262                                         try {
 263                                                 if (valOld.hasVariables() ||                            // If the 'static' value has child variables
 264                                                                 valNew.hasVariables()) {                        //  or if the DBG value has child variables
 265                                                         if (!hasRecursion(varOld) && !hasRecursion(varNew)) { // Both branches should not have a recursion
 266                                                                 updateVariableList(valOld.getChildVariables(), // Update the variable list for the child variables
 267                                                                                 valNew.getChildVariables());
 268                                                         }
 269                                                 } else if (!valOld.getValueString().equals(
 270                                                                 valNew.getValueString())) {             // Has the value changed?
 271                                                         valOld.setValueString(valNew.getValueString()); // Yes, set the 'static' value (variable) to the new value
 272                                                         varOld.setValueChanged(true);                   // and set the 'has changed' flag, so that the variable view
 273                                                                                                                                         // could show the user the changed status with a different
 274                                                                                                                                         // color
 275                                                 }
 276                                                 //else {
 277                                                 //      varOld.setValueChanged (false);                                     // Reset the 'has changed' flag
 278                                                 //}
 279                                         } catch (DebugException e) {                                    // That's, because of the hasVariables method
 280                                         }
 281
 282                                         break;                                                                                  // Found the variable,
 283                                 }
 284                         }
 285
 286                         if (o == varListOld.size()) {                                                   // Did we found the variable within the static list?
 287                                 varListOld.add(varNew);                                                         //  No, then add the DBG variable to the static list
 288                         }
 289                 }
 290
 291                 // Look for the variables we can remove from the 'static' list
 292
 293                 for (o = 0; o < varListOld.size(); o++) {                                       // For every variable in 'static' list
 294                         varOld = (PHPVariable) varListOld.get(o);                               // Get the static variable
 295
 296                         for (n = 0; n < varListNew.size(); n++) {                               // For all variables in 'DBG' list
 297                                 varNew = (PHPVariable) varListNew.get(n);                       // Get the variable from the 'DBG' list
 298
 299                                 if (varNew.getName().equals(varOld.getName())) {        // Did we found the 'static' list variable within the 'DBG' list?
 300                                         break;                                                                                  // Yes we found the variable, then leave the loop
 301                                 }
 302                         }
 303
 304                         if (n == varListNew.size()) {                                                   // Did not find the 'static' list variable within the 'DBG' list?
 305                                 varListOld.remove(o--);                                                         // then remove the 'static' list variable from list
 306                         }
 307                 }
 308         }
 309
 310         /**
 311          *
 312          * This function returns the array of PHPVariables for this stackframe
 313          * The PHPVariables should not change (newly build up) between two steps
 314          * (or breaks).
 315          * A PHPVariable with the same name but with different object ID is
 316          * handled as a new variable.
 317          *
 318          * @return The array of PHPVariables for this stackframe.
 319          */
 320         public IVariable[] getVariables() throws DebugException {
 321                 if (!fUpToDate) {
 322                         resetHasChangedInfo(varList);
 323                         updateVariableList(varList, this.getPHPDBGProxy().readVariables(this));
 324                         fUpToDate = true;
 325                         Collections.sort(varList, new PHPVariableComparator());
 326                 }
 327
 328                 return (PHPVariable[]) varList.toArray(new PHPVariable[varList.size()]);
 329         }
 330
 331         /**
 332          *
 333          */
 334         private PHPVariable findVariable(Vector varList, String varname) {
 335                 PHPVariable variable;
 336                 PHPValue        value;
 337                 int             i;
 338
 339                 for (i = 0; i < varList.size(); i++) {                                          // For all variables
 340                         variable = (PHPVariable) varList.get(i);                                // Get the variable
 341                         value = (PHPValue) variable.getValue();                                 // Get the value of the variable
 342
 343                         try {
 344                                 if (value.hasVariables()) {                                             // Does the variable/value have children
 345                                         if (!hasRecursion(variable)) {                                  // Don't follow recursive variable/values
 346                                                 variable = findVariable(value.getChildVariables(),
 347                                                                 varname);
 348
 349                                                 if (variable != null) {
 350                                                         return variable;
 351                                                 }
 352                                         }
 353                                 } else if ((variable.getName()).equals(varname)) {      //
 354                                         return variable; //
 355                                 }
 356                         } catch (DebugException e) {                                                    // That's, because of the hasVariables method
 357                         }
 358                 }
 359
 360                 return null;
 361         }
 362
 363         /**
 364          * This method is called from the UI (e.g. from PHPDebugHover
 365          * to find the variable the mouse is pointing to)
 366          *
 367          * @param s The variable name we are looking for.
 368          * @return
 369          */
 370         public IVariable findVariable(String s) throws DebugException {
 371                 if (!fUpToDate) {
 372                         getVariables();
 373                 }
 374
 375                 return (findVariable(varList, s));                                                      // Prefix the variable name with $
 376         }
 377
 378         /**
 379          *
 380          */
 381         public boolean hasVariables() throws DebugException {
 382                 if (!fUpToDate) {
 383                         getVariables();
 384                 }
 385
 386                 return (varList.size() > 0);
 387         }
 388
 389         public int getLineNumber() {
 390                 return lineNumber;
 391         }
 392
 393         public void setLineNumber(int line) {
 394                 lineNumber = line;
 395         }
 396
 397         public int getCharStart() throws DebugException {
 398                 // not supported
 399                 return -1;
 400         }
 401
 402         public int getCharEnd() throws DebugException {
 403                 // not supported
 404                 return -1;
 405         }
 406
 407         public String getName() {
 408                 StringBuffer name = new StringBuffer();
 409
 410                 if (!this.getDescription().equals("")) {
 411                         name.append(this.getDescription());
 412                 } else {
 413                         name.append(this.getFileName());
 414                 }
 415
 416                 name.append(" [line ");
 417                 name.append(this.getLineNumber());
 418                 name.append("]");
 419
 420                 return name.toString();
 421         }
 422
 423         public String getFileName() {
 424                 return file;
 425         }
 426
 427         public void setDescription(String desc) {
 428                 this.description = desc;
 429         }
 430
 431         public String getDescription() {
 432                 return this.description;
 433         }
 434
 435         public IRegisterGroup[] getRegisterGroups() throws DebugException {
 436                 return null;
 437         }
 438
 439         public boolean hasRegisterGroups() throws DebugException {
 440                 return false;
 441         }
 442
 443         public String getModelIdentifier() {
 444                 return this.getThread().getModelIdentifier();
 445         }
 446
 447         public IDebugTarget getDebugTarget() {
 448                 return this.getThread().getDebugTarget();
 449         }
 450
 451         public ILaunch getLaunch() {
 452                 return this.getDebugTarget().getLaunch();
 453         }
 454
 455         public boolean canStepInto() {
 456                 return canResume();
 457         }
 458
 459         public boolean canStepOver() {
 460                 return canResume();
 461         }
 462
 463         public boolean canStepReturn() {
 464                 return canResume();
 465         }
 466
 467         public boolean isStepping() {
 468                 return false;
 469         }
 470
 471         /**
 472          *
 473          */
 474         public void stepInto() throws DebugException {
 475                 fUpToDate = false;
 476
 477                 thread.prepareForResume(DebugEvent.STEP_INTO);                          // Don't know why, but this is necessary
 478                 this.getPHPDBGProxy().readStepIntoEnd(PHPStackFrame.this);
 479
 480         // Commented out sending the RESUME event because it was already sent by prepareForResume.
 481         // The second RESUME event leads only to a little flickering within the variables view.
 482         // It is also not clear why this event was necessary in eclipse < 3.2
 483         // Also sending a SUSPEND event here leads to a total rebuild of the variables view.
 484         // (eclipse 3.2 has a build in timeout of 500 ms which leads to a auto suspend, with
 485         // no flickering... but why???)
 486         //
 487                 //ev = new DebugEvent (this.getThread (), DebugEvent.RESUME, DebugEvent.STEP_INTO);
 488                 //DebugPlugin.getDefault().fireDebugEventSet (new DebugEvent[] { ev });
 489         }
 490
 491         /**
 492          *
 493          */
 494         public void stepOver() throws DebugException {
 495                 fUpToDate = false;
 496
 497                 thread.prepareForResume(DebugEvent.STEP_OVER);
 498                 this.getPHPDBGProxy().readStepOverEnd(PHPStackFrame.this);
 499
 500         // See comment within the previous stepInto method.
 501         //
 502                 //ev = new DebugEvent (this.getThread (), DebugEvent.RESUME, DebugEvent.STEP_OVER);
 503                 //DebugPlugin.getDefault ().fireDebugEventSet (new DebugEvent[] { ev });
 504         }
 505
 506         /**
 507          *
 508          */
 509         public void stepReturn() throws DebugException {
 510                 fUpToDate = false;
 511
 512                 thread.prepareForResume(DebugEvent.STEP_RETURN);
 513                 this.getPHPDBGProxy().readStepReturnEnd(PHPStackFrame.this);
 514
 515                 //ev = new DebugEvent (this.getThread (), DebugEvent.RESUME, DebugEvent.STEP_RETURN);
 516                 //DebugPlugin.getDefault ().fireDebugEventSet (new DebugEvent[] { ev });
 517         }
 518
 519         public boolean canResume() {
 520                 return this.getThread().canResume();
 521         }
 522
 523         public boolean canSuspend() {
 524                 return this.getThread().canSuspend();
 525         }
 526
 527         public boolean isSuspended() {
 528                 return this.getThread().isSuspended();
 529         }
 530
 531         public void resume() throws DebugException {
 532                 fUpToDate = false;
 533
 534                 this.getThread().resume();
 535         }
 536
 537         public void suspend() throws DebugException {
 538         }
 539
 540         public boolean canTerminate() {
 541                 return this.getThread().canTerminate();
 542         }
 543
 544         public boolean isTerminated() {
 545                 return this.getThread().isTerminated();
 546         }
 547
 548         public void terminate() throws DebugException {
 549                 getPHPDBGProxy().stop();
 550         }
 551
 552         public int getIndex() {
 553                 return index;
 554         }
 555
 556         public void setIndex(int index) {
 557                 this.index = index;
 558         }
 559
 560         public PHPDBGProxy getPHPDBGProxy() {
 561                 PHPDebugTarget DebugTarget;
 562
 563                 DebugTarget = (PHPDebugTarget) thread.getDebugTarget();
 564
 565                 return DebugTarget.getPHPDBGProxy();
 566         }
 567
 568         public void setFile(String file) {
 569                 this.file = file;
 570         }
 571
 572         public int getModNo() {
 573                 return modno;
 574         }
 575
 576         /**
 577          * This function is needed when sorting the stackframes by their index numbers.
 578          *
 579          * @param obj The stackframe which this one is compared to.
 580          * @return
 581          * <ul>
 582          * <li> -1 if the index of this stackframe is less.
 583          * <li> 0 if the index of both stackfream is equal (should no happen).
 584          * <li> 1 if the index of this stackfram is greater.
 585          * </ul>
 586          */
 587         public int compareTo(Object obj) {
 588                 //if (index < ((PHPStackFrame) obj).getIndex()) {
 589                 //      return -1;
 590                 //} else if (index > ((PHPStackFrame) obj).getIndex()) {
 591                 //      return 1;
 592                 //}
 593
 594                 //return 0;
 595                 return Integer.signum(index - ((PHPStackFrame) obj).getIndex());
 596         }
 597 }