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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation 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 API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpeclipse.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.core.compiler.CharOperation;
  14 import net.sourceforge.phpdt.internal.compiler.CompilationResult;
  15 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  17 import net.sourceforge.phpdt.internal.compiler.flow.InitializationFlowContext;
  18 import net.sourceforge.phpdt.internal.compiler.impl.ReferenceContext;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.ClassScope;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
  21 import net.sourceforge.phpdt.internal.compiler.lookup.MethodScope;
  22 import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
  23 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  24 import net.sourceforge.phpdt.internal.compiler.parser.UnitParser;
  25 import net.sourceforge.phpdt.internal.compiler.problem.AbortCompilation;
  26 import net.sourceforge.phpdt.internal.compiler.problem.AbortCompilationUnit;
  27 import net.sourceforge.phpdt.internal.compiler.problem.AbortMethod;
  28 import net.sourceforge.phpdt.internal.compiler.problem.AbortType;
  29 import net.sourceforge.phpdt.internal.compiler.problem.ProblemSeverities;
  30
  31
  32 public abstract class AbstractMethodDeclaration
  33         extends AstNode
  34         implements ProblemSeverities, ReferenceContext {
  35
  36         public MethodScope scope;
  37         //it is not relevent for constructor but it helps to have the name of the constructor here
  38         //which is always the name of the class.....parsing do extra work to fill it up while it do not have to....
  39         public char[] selector;
  40         public int declarationSourceStart;
  41         public int declarationSourceEnd;
  42         public int modifiers;
  43         public int modifiersSourceStart;
  44         public Argument[] arguments;
  45         public TypeReference[] thrownExceptions;
  46         public Statement[] statements;
  47         public int explicitDeclarations;
  48         public MethodBinding binding;
  49         public boolean ignoreFurtherInvestigation = false;
  50         public boolean needFreeReturn = false;
  51
  52         public int bodyStart;
  53         public int bodyEnd = -1;
  54         public CompilationResult compilationResult;
  55
  56         AbstractMethodDeclaration(CompilationResult compilationResult){
  57                 this.compilationResult = compilationResult;
  58         }
  59
  60         /*
  61          *      We cause the compilation task to abort to a given extent.
  62          */
  63         public void abort(int abortLevel) {
  64
  65                 if (scope == null) {
  66                         throw new AbortCompilation(); // cannot do better
  67                 }
  68
  69                 CompilationResult compilationResult =
  70                         scope.referenceCompilationUnit().compilationResult;
  71
  72                 switch (abortLevel) {
  73                         case AbortCompilation :
  74                                 throw new AbortCompilation(compilationResult);
  75                         case AbortCompilationUnit :
  76                                 throw new AbortCompilationUnit(compilationResult);
  77                         case AbortType :
  78                                 throw new AbortType(compilationResult);
  79                         default :
  80                                 throw new AbortMethod(compilationResult);
  81                 }
  82         }
  83
  84         public abstract void analyseCode(ClassScope scope, InitializationFlowContext initializationContext, FlowInfo info);
  85
  86                 /**
  87          * Bind and add argument's binding into the scope of the method
  88          */
  89         public void bindArguments() {
  90
  91                 if (arguments != null) {
  92                         // by default arguments in abstract/native methods are considered to be used (no complaint is expected)
  93                         boolean used = binding == null || binding.isAbstract();// || binding.isNative();
  94
  95                         int length = arguments.length;
  96                         for (int i = 0; i < length; i++) {
  97                                 TypeBinding argType = binding == null ? null : binding.parameters[i];
  98                                 arguments[i].bind(scope, argType, used);
  99                         }
 100                 }
 101         }
 102
 103         /**
 104          * Record the thrown exception type bindings in the corresponding type references.
 105          */
 106         public void bindThrownExceptions() {
 107
 108                 if (this.thrownExceptions != null
 109                         && this.binding != null
 110                         && this.binding.thrownExceptions != null) {
 111                         int thrownExceptionLength = this.thrownExceptions.length;
 112                         int length = this.binding.thrownExceptions.length;
 113                         if (length == thrownExceptionLength) {
 114                                 for (int i = 0; i < length; i++) {
 115                                         this.thrownExceptions[i].resolvedType = this.binding.thrownExceptions[i];
 116                                 }
 117                         } else {
 118                                 int bindingIndex = 0;
 119                                 for (int i = 0; i < thrownExceptionLength && bindingIndex < length; i++) {
 120                                         TypeReference thrownException = this.thrownExceptions[i];
 121                                         ReferenceBinding thrownExceptionBinding = this.binding.thrownExceptions[bindingIndex];
 122                                         char[][] bindingCompoundName = thrownExceptionBinding.compoundName;
 123                                         if (thrownException instanceof SingleTypeReference) {
 124                                                 // single type reference
 125                                                 int lengthName = bindingCompoundName.length;
 126                                                 char[] thrownExceptionTypeName = thrownException.getTypeName()[0];
 127                                                 if (CharOperation.equals(thrownExceptionTypeName, bindingCompoundName[lengthName - 1])) {
 128                                                         thrownException.resolvedType = thrownExceptionBinding;
 129                                                         bindingIndex++;
 130                                                 }
 131                                         } else {
 132                                                 // qualified type reference
 133                                                 if (CharOperation.equals(thrownException.getTypeName(), bindingCompoundName)) {
 134                                                         thrownException.resolvedType = thrownExceptionBinding;
 135                                                         bindingIndex++;
 136                                                 }
 137                                         }
 138                                 }
 139                         }
 140                 }
 141         }
 142
 143         public CompilationResult compilationResult() {
 144
 145                 return this.compilationResult;
 146         }
 147
 148         /**
 149          * Bytecode generation for a method
 150          */
 151 //      public void generateCode(ClassScope classScope, ClassFile classFile) {
 152 //
 153 //              int problemResetPC = 0;
 154 //              classFile.codeStream.wideMode = false; // reset wideMode to false
 155 //              if (ignoreFurtherInvestigation) {
 156 //                      // method is known to have errors, dump a problem method
 157 //                      if (this.binding == null)
 158 //                              return; // handle methods with invalid signature or duplicates
 159 //                      int problemsLength;
 160 //                      IProblem[] problems =
 161 //                              scope.referenceCompilationUnit().compilationResult.getProblems();
 162 //                      IProblem[] problemsCopy = new IProblem[problemsLength = problems.length];
 163 //                      System.arraycopy(problems, 0, problemsCopy, 0, problemsLength);
 164 //                      classFile.addProblemMethod(this, binding, problemsCopy);
 165 //                      return;
 166 //              }
 167 //              // regular code generation
 168 //              try {
 169 //                      problemResetPC = classFile.contentsOffset;
 170 //                      this.generateCode(classFile);
 171 //              } catch (AbortMethod e) {
 172 //                      // a fatal error was detected during code generation, need to restart code gen if possible
 173 //                      if (e.compilationResult == CodeStream.RESTART_IN_WIDE_MODE) {
 174 //                              // a branch target required a goto_w, restart code gen in wide mode.
 175 //                              try {
 176 //                                      this.traverse(new ResetStateForCodeGenerationVisitor(), classScope);
 177 //                                      classFile.contentsOffset = problemResetPC;
 178 //                                      classFile.methodCount--;
 179 //                                      classFile.codeStream.wideMode = true; // request wide mode
 180 //                                      this.generateCode(classFile); // restart method generation
 181 //                              } catch (AbortMethod e2) {
 182 //                                      int problemsLength;
 183 //                                      IProblem[] problems =
 184 //                                              scope.referenceCompilationUnit().compilationResult.getAllProblems();
 185 //                                      IProblem[] problemsCopy = new IProblem[problemsLength = problems.length];
 186 //                                      System.arraycopy(problems, 0, problemsCopy, 0, problemsLength);
 187 //                                      classFile.addProblemMethod(this, binding, problemsCopy, problemResetPC);
 188 //                              }
 189 //                      } else {
 190 //                              // produce a problem method accounting for this fatal error
 191 //                              int problemsLength;
 192 //                              IProblem[] problems =
 193 //                                      scope.referenceCompilationUnit().compilationResult.getAllProblems();
 194 //                              IProblem[] problemsCopy = new IProblem[problemsLength = problems.length];
 195 //                              System.arraycopy(problems, 0, problemsCopy, 0, problemsLength);
 196 //                              classFile.addProblemMethod(this, binding, problemsCopy, problemResetPC);
 197 //                      }
 198 //              }
 199 //      }
 200 //
 201 //      private void generateCode(ClassFile classFile) {
 202 //
 203 //              classFile.generateMethodInfoHeader(binding);
 204 //              int methodAttributeOffset = classFile.contentsOffset;
 205 //              int attributeNumber = classFile.generateMethodInfoAttribute(binding);
 206 //              if ((!binding.isNative()) && (!binding.isAbstract())) {
 207 //                      int codeAttributeOffset = classFile.contentsOffset;
 208 //                      classFile.generateCodeAttributeHeader();
 209 //                      CodeStream codeStream = classFile.codeStream;
 210 //                      codeStream.reset(this, classFile);
 211 //                      // initialize local positions
 212 //                      this.scope.computeLocalVariablePositions(binding.isStatic() ? 0 : 1, codeStream);
 213 //
 214 //                      // arguments initialization for local variable debug attributes
 215 //                      if (arguments != null) {
 216 //                              for (int i = 0, max = arguments.length; i < max; i++) {
 217 //                                      LocalVariableBinding argBinding;
 218 //                                      codeStream.addVisibleLocalVariable(argBinding = arguments[i].binding);
 219 //                                      argBinding.recordInitializationStartPC(0);
 220 //                              }
 221 //                      }
 222 //                      if (statements != null) {
 223 //                              for (int i = 0, max = statements.length; i < max; i++)
 224 //                                      statements[i].generateCode(scope, codeStream);
 225 //                      }
 226 //                      if (this.needFreeReturn) {
 227 //                              codeStream.return_();
 228 //                      }
 229 //                      // local variable attributes
 230 //                      codeStream.exitUserScope(scope);
 231 //                      codeStream.recordPositionsFrom(0, this.declarationSourceEnd);
 232 //                      classFile.completeCodeAttribute(codeAttributeOffset);
 233 //                      attributeNumber++;
 234 //              } else {
 235 //                      checkArgumentsSize();
 236 //              }
 237 //              classFile.completeMethodInfo(methodAttributeOffset, attributeNumber);
 238 //
 239 //              // if a problem got reported during code gen, then trigger problem method creation
 240 //              if (ignoreFurtherInvestigation) {
 241 //                      throw new AbortMethod(scope.referenceCompilationUnit().compilationResult);
 242 //              }
 243 //      }
 244
 245 //      private void checkArgumentsSize() {
 246 //              TypeBinding[] parameters = binding.parameters;
 247 //              int size = 1; // an abstact method or a native method cannot be static
 248 //              for (int i = 0, max = parameters.length; i < max; i++) {
 249 //                      TypeBinding parameter = parameters[i];
 250 //                      if (parameter == LongBinding || parameter == DoubleBinding) {
 251 //                              size += 2;
 252 //                      } else {
 253 //                              size++;
 254 //                      }
 255 //                      if (size > 0xFF) {
 256 //                              scope.problemReporter().noMoreAvailableSpaceForArgument(scope.locals[i], scope.locals[i].declaration);
 257 //                      }
 258 //              }
 259 //      }
 260
 261         public boolean hasErrors() {
 262                 return this.ignoreFurtherInvestigation;
 263         }
 264
 265         public boolean isAbstract() {
 266
 267                 if (binding != null)
 268                         return binding.isAbstract();
 269                 return (modifiers & AccAbstract) != 0;
 270         }
 271
 272         public boolean isClinit() {
 273
 274                 return false;
 275         }
 276
 277         public boolean isConstructor() {
 278
 279                 return false;
 280         }
 281
 282         public boolean isDefaultConstructor() {
 283
 284                 return false;
 285         }
 286
 287         public boolean isInitializationMethod() {
 288
 289                 return false;
 290         }
 291
 292 //      public boolean isNative() {
 293 //
 294 //              if (binding != null)
 295 //                      return binding.isNative();
 296 //              return (modifiers & AccNative) != 0;
 297 //      }
 298
 299         public boolean isStatic() {
 300
 301                 if (binding != null)
 302                         return binding.isStatic();
 303                 return (modifiers & AccStatic) != 0;
 304         }
 305
 306         /**
 307          * Fill up the method body with statement
 308          */
 309         public abstract void parseStatements(
 310                 UnitParser parser,
 311                 CompilationUnitDeclaration unit);
 312
 313         public void resolve(ClassScope upperScope) {
 314
 315                 if (binding == null) {
 316                         ignoreFurtherInvestigation = true;
 317                 }
 318
 319                 try {
 320                         bindArguments();
 321                         bindThrownExceptions();
 322                         resolveStatements();
 323                 } catch (AbortMethod e) {       // ========= abort on fatal error =============
 324                         this.ignoreFurtherInvestigation = true;
 325                 }
 326         }
 327
 328         public void resolveStatements() {
 329
 330                 if (statements != null) {
 331                         int i = 0, length = statements.length;
 332                         while (i < length)
 333                                 statements[i++].resolve(scope);
 334                 }
 335         }
 336
 337         public String returnTypeToString(int tab) {
 338
 339                 return ""; //$NON-NLS-1$
 340         }
 341
 342         public void tagAsHavingErrors() {
 343
 344                 ignoreFurtherInvestigation = true;
 345         }
 346
 347         public String toString(int tab) {
 348
 349                 String s = tabString(tab);
 350                 if (modifiers != AccDefault) {
 351                         s += modifiersString(modifiers);
 352                 }
 353
 354                 s += returnTypeToString(0);
 355                 s += new String(selector) + "("; //$NON-NLS-1$
 356                 if (arguments != null) {
 357                         for (int i = 0; i < arguments.length; i++) {
 358                                 s += arguments[i].toString(0);
 359                                 if (i != (arguments.length - 1))
 360                                         s = s + ", "; //$NON-NLS-1$
 361                         };
 362                 };
 363                 s += ")"; //$NON-NLS-1$
 364                 if (thrownExceptions != null) {
 365                         s += " throws "; //$NON-NLS-1$
 366                         for (int i = 0; i < thrownExceptions.length; i++) {
 367                                 s += thrownExceptions[i].toString(0);
 368                                 if (i != (thrownExceptions.length - 1))
 369                                         s = s + ", "; //$NON-NLS-1$
 370                         };
 371                 };
 372
 373                 s += toStringStatements(tab + 1);
 374                 return s;
 375         }
 376
 377         public String toStringStatements(int tab) {
 378
 379                 if (isAbstract() || (this.modifiers & AccSemicolonBody) != 0)
 380                         return ";"; //$NON-NLS-1$
 381
 382                 String s = " {"; //$NON-NLS-1$
 383                 if (statements != null) {
 384                         for (int i = 0; i < statements.length; i++) {
 385                                 s = s + "\n" + statements[i].toString(tab); //$NON-NLS-1$
 386                                 if (!(statements[i] instanceof Block)) {
 387                                         s += ";"; //$NON-NLS-1$
 388                                 }
 389                         }
 390                 }
 391                 s += "\n" + tabString(tab == 0 ? 0 : tab - 1) + "}"; //$NON-NLS-2$ //$NON-NLS-1$
 392                 return s;
 393         }
 394
 395         public void traverse(
 396                 IAbstractSyntaxTreeVisitor visitor,
 397                 ClassScope classScope) {
 398         }
 399 }