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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines 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 v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.core.compiler.*;
  14 import net.sourceforge.phpdt.internal.compiler.*;
  15 import net.sourceforge.phpdt.internal.compiler.impl.*;
  16 import net.sourceforge.phpdt.internal.compiler.codegen.*;
  17 import net.sourceforge.phpdt.internal.compiler.flow.*;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.*;
  19 import net.sourceforge.phpdt.internal.compiler.problem.*;
  20 import net.sourceforge.phpdt.internal.compiler.parser.*;
  21
  22 public abstract class AbstractMethodDeclaration
  23         extends AstNode
  24         implements ProblemSeverities, ReferenceContext {
  25
  26         public MethodScope scope;
  27         //it is not relevent for constructor but it helps to have the name of the constructor here
  28         //which is always the name of the class.....parsing do extra work to fill it up while it do not have to....
  29         public char[] selector;
  30         public int declarationSourceStart;
  31         public int declarationSourceEnd;
  32         public int modifiers;
  33         public int modifiersSourceStart;
  34         public Argument[] arguments;
  35         public TypeReference[] thrownExceptions;
  36         public Statement[] statements;
  37         public int explicitDeclarations;
  38         public MethodBinding binding;
  39         public boolean ignoreFurtherInvestigation = false;
  40         public boolean needFreeReturn = false;
  41
  42         public int bodyStart;
  43         public int bodyEnd = -1;
  44         public CompilationResult compilationResult;
  45
  46         AbstractMethodDeclaration(CompilationResult compilationResult){
  47                 this.compilationResult = compilationResult;
  48         }
  49
  50         /*
  51          *      We cause the compilation task to abort to a given extent.
  52          */
  53         public void abort(int abortLevel) {
  54
  55                 if (scope == null) {
  56                         throw new AbortCompilation(); // cannot do better
  57                 }
  58
  59                 CompilationResult compilationResult =
  60                         scope.referenceCompilationUnit().compilationResult;
  61
  62                 switch (abortLevel) {
  63                         case AbortCompilation :
  64                                 throw new AbortCompilation(compilationResult);
  65                         case AbortCompilationUnit :
  66                                 throw new AbortCompilationUnit(compilationResult);
  67                         case AbortType :
  68                                 throw new AbortType(compilationResult);
  69                         default :
  70                                 throw new AbortMethod(compilationResult);
  71                 }
  72         }
  73
  74         public void analyseCode(
  75                 ClassScope currentScope,
  76                 FlowContext flowContext,
  77                 FlowInfo flowInfo) {
  78
  79                 // starting of the code analysis for methods
  80                 if (ignoreFurtherInvestigation)
  81                         return;
  82                 try {
  83                         if (binding == null)
  84                                 return;
  85                         // may be in a non necessary <clinit> for innerclass with static final constant fields
  86                         if (binding.isAbstract() || binding.isNative())
  87                                 return;
  88
  89                         ExceptionHandlingFlowContext methodContext =
  90                                 new ExceptionHandlingFlowContext(
  91                                         flowContext,
  92                                         this,
  93                                         binding.thrownExceptions,
  94                                         scope,
  95                                         FlowInfo.DeadEnd);
  96
  97                         // propagate to statements
  98                         if (statements != null) {
  99                                 for (int i = 0, count = statements.length; i < count; i++) {
 100                                         Statement stat;
 101                                         if (!flowInfo.complainIfUnreachable((stat = statements[i]), scope)) {
 102                                                 flowInfo = stat.analyseCode(scope, methodContext, flowInfo);
 103                                         }
 104                                 }
 105                         }
 106                         // check for missing returning path
 107                         TypeBinding returnType = binding.returnType;
 108                         if ((returnType == VoidBinding) || isAbstract()) {
 109                                 needFreeReturn =
 110                                         !((flowInfo == FlowInfo.DeadEnd) || flowInfo.isFakeReachable());
 111                         } else {
 112                                 if (flowInfo != FlowInfo.DeadEnd) {
 113                                         // special test for empty methods that should return something
 114                                         if ((statements == null) && (returnType != VoidBinding)) {
 115                                                 scope.problemReporter().shouldReturn(returnType, this);
 116                                         } else {
 117                                                 scope.problemReporter().shouldReturn(
 118                                                         returnType,
 119                                                         statements[statements.length - 1]);
 120                                         }
 121                                 }
 122                         }
 123                 } catch (AbortMethod e) {
 124                         this.ignoreFurtherInvestigation = true;
 125                 }
 126         }
 127
 128         /**
 129          * Bind and add argument's binding into the scope of the method
 130          */
 131         public void bindArguments() {
 132
 133                 if (arguments != null) {
 134                         // by default arguments in abstract/native methods are considered to be used (no complaint is expected)
 135                         boolean used = binding == null || binding.isAbstract() || binding.isNative();
 136
 137                         int length = arguments.length;
 138                         for (int i = 0; i < length; i++) {
 139                                 TypeBinding argType = binding == null ? null : binding.parameters[i];
 140                                 arguments[i].bind(scope, argType, used);
 141                         }
 142                 }
 143         }
 144
 145         /**
 146          * Record the thrown exception type bindings in the corresponding type references.
 147          */
 148         public void bindThrownExceptions() {
 149
 150                 if (this.thrownExceptions != null
 151                         && this.binding != null
 152                         && this.binding.thrownExceptions != null) {
 153                         int length = this.binding.thrownExceptions.length;
 154                         for (int i = 0; i < length; i++) {
 155                                 this.thrownExceptions[i].binding = this.binding.thrownExceptions[i];
 156                         }
 157                 }
 158         }
 159
 160         public CompilationResult compilationResult() {
 161
 162                 return this.compilationResult;
 163         }
 164
 165         /**
 166          * Bytecode generation for a method
 167          */
 168         public void generateCode(ClassScope classScope, ClassFile classFile) {
 169
 170                 int problemResetPC = 0;
 171                 classFile.codeStream.wideMode = false; // reset wideMode to false
 172                 if (ignoreFurtherInvestigation) {
 173                         // method is known to have errors, dump a problem method
 174                         if (this.binding == null)
 175                                 return; // handle methods with invalid signature or duplicates
 176                         int problemsLength;
 177                         IProblem[] problems =
 178                                 scope.referenceCompilationUnit().compilationResult.getProblems();
 179                         IProblem[] problemsCopy = new IProblem[problemsLength = problems.length];
 180                         System.arraycopy(problems, 0, problemsCopy, 0, problemsLength);
 181                         classFile.addProblemMethod(this, binding, problemsCopy);
 182                         return;
 183                 }
 184                 // regular code generation
 185                 try {
 186                         problemResetPC = classFile.contentsOffset;
 187                         this.generateCode(classFile);
 188                 } catch (AbortMethod e) {
 189                         // a fatal error was detected during code generation, need to restart code gen if possible
 190                         if (e.compilationResult == CodeStream.RESTART_IN_WIDE_MODE) {
 191                                 // a branch target required a goto_w, restart code gen in wide mode.
 192                                 try {
 193                                         this.traverse(new ResetStateForCodeGenerationVisitor(), classScope);
 194                                         classFile.contentsOffset = problemResetPC;
 195                                         classFile.methodCount--;
 196                                         classFile.codeStream.wideMode = true; // request wide mode
 197                                         this.generateCode(classFile); // restart method generation
 198                                 } catch (AbortMethod e2) {
 199                                         int problemsLength;
 200                                         IProblem[] problems =
 201                                                 scope.referenceCompilationUnit().compilationResult.getProblems();
 202                                         IProblem[] problemsCopy = new IProblem[problemsLength = problems.length];
 203                                         System.arraycopy(problems, 0, problemsCopy, 0, problemsLength);
 204                                         classFile.addProblemMethod(this, binding, problemsCopy, problemResetPC);
 205                                 }
 206                         } else {
 207                                 // produce a problem method accounting for this fatal error
 208                                 int problemsLength;
 209                                 IProblem[] problems =
 210                                         scope.referenceCompilationUnit().compilationResult.getProblems();
 211                                 IProblem[] problemsCopy = new IProblem[problemsLength = problems.length];
 212                                 System.arraycopy(problems, 0, problemsCopy, 0, problemsLength);
 213                                 classFile.addProblemMethod(this, binding, problemsCopy, problemResetPC);
 214                         }
 215                 }
 216         }
 217
 218         private void generateCode(ClassFile classFile) {
 219
 220                 classFile.generateMethodInfoHeader(binding);
 221                 int methodAttributeOffset = classFile.contentsOffset;
 222                 int attributeNumber = classFile.generateMethodInfoAttribute(binding);
 223                 if ((!binding.isNative()) && (!binding.isAbstract())) {
 224                         int codeAttributeOffset = classFile.contentsOffset;
 225                         classFile.generateCodeAttributeHeader();
 226                         CodeStream codeStream = classFile.codeStream;
 227                         codeStream.reset(this, classFile);
 228                         // initialize local positions
 229                         scope.computeLocalVariablePositions(binding.isStatic() ? 0 : 1, codeStream);
 230
 231                         // arguments initialization for local variable debug attributes
 232                         if (arguments != null) {
 233                                 for (int i = 0, max = arguments.length; i < max; i++) {
 234                                         LocalVariableBinding argBinding;
 235                                         codeStream.addVisibleLocalVariable(argBinding = arguments[i].binding);
 236                                         argBinding.recordInitializationStartPC(0);
 237                                 }
 238                         }
 239                         if (statements != null) {
 240                                 for (int i = 0, max = statements.length; i < max; i++)
 241                                         statements[i].generateCode(scope, codeStream);
 242                         }
 243                         if (needFreeReturn) {
 244                                 codeStream.return_();
 245                         }
 246                         // local variable attributes
 247                         codeStream.exitUserScope(scope);
 248                         codeStream.recordPositionsFrom(0, this.bodyEnd);
 249                         classFile.completeCodeAttribute(codeAttributeOffset);
 250                         attributeNumber++;
 251                 }
 252                 classFile.completeMethodInfo(methodAttributeOffset, attributeNumber);
 253
 254                 // if a problem got reported during code gen, then trigger problem method creation
 255                 if (ignoreFurtherInvestigation) {
 256                         throw new AbortMethod(scope.referenceCompilationUnit().compilationResult);
 257                 }
 258         }
 259
 260         public boolean hasErrors() {
 261                 return this.ignoreFurtherInvestigation;
 262         }
 263
 264         public boolean isAbstract() {
 265
 266                 if (binding != null)
 267                         return binding.isAbstract();
 268                 return (modifiers & AccAbstract) != 0;
 269         }
 270
 271         public boolean isClinit() {
 272
 273                 return false;
 274         }
 275
 276         public boolean isConstructor() {
 277
 278                 return false;
 279         }
 280
 281         public boolean isDefaultConstructor() {
 282
 283                 return false;
 284         }
 285
 286         public boolean isInitializationMethod() {
 287
 288                 return false;
 289         }
 290
 291         public boolean isNative() {
 292
 293                 if (binding != null)
 294                         return binding.isNative();
 295                 return (modifiers & AccNative) != 0;
 296         }
 297
 298         public boolean isStatic() {
 299
 300                 if (binding != null)
 301                         return binding.isStatic();
 302                 return (modifiers & AccStatic) != 0;
 303         }
 304
 305         /**
 306          * Fill up the method body with statement
 307          */
 308         public abstract void parseStatements(
 309                 Parser parser,
 310                 CompilationUnitDeclaration unit);
 311
 312         public void resolve(ClassScope upperScope) {
 313
 314                 if (binding == null) {
 315                         ignoreFurtherInvestigation = true;
 316                 }
 317
 318                 try {
 319                         bindArguments();
 320                         bindThrownExceptions();
 321                         resolveStatements(upperScope);
 322                 } catch (AbortMethod e) {       // ========= abort on fatal error =============
 323                         this.ignoreFurtherInvestigation = true;
 324                 }
 325         }
 326
 327         public void resolveStatements(ClassScope upperScope) {
 328
 329                 if (statements != null) {
 330                         int i = 0, length = statements.length;
 331                         while (i < length)
 332                                 statements[i++].resolve(scope);
 333                 }
 334         }
 335
 336         public String returnTypeToString(int tab) {
 337
 338                 return ""; //$NON-NLS-1$
 339         }
 340
 341         public void tagAsHavingErrors() {
 342
 343                 ignoreFurtherInvestigation = true;
 344         }
 345
 346         public String toString(int tab) {
 347
 348                 String s = tabString(tab);
 349                 if (modifiers != AccDefault) {
 350                         s += modifiersString(modifiers);
 351                 }
 352
 353                 s += returnTypeToString(0);
 354                 s += new String(selector) + "("; //$NON-NLS-1$
 355                 if (arguments != null) {
 356                         for (int i = 0; i < arguments.length; i++) {
 357                                 s += arguments[i].toString(0);
 358                                 if (i != (arguments.length - 1))
 359                                         s = s + ", "; //$NON-NLS-1$
 360                         };
 361                 };
 362                 s += ")"; //$NON-NLS-1$
 363                 if (thrownExceptions != null) {
 364                         s += " throws "; //$NON-NLS-1$
 365                         for (int i = 0; i < thrownExceptions.length; i++) {
 366                                 s += thrownExceptions[i].toString(0);
 367                                 if (i != (thrownExceptions.length - 1))
 368                                         s = s + ", "; //$NON-NLS-1$
 369                         };
 370                 };
 371
 372                 s += toStringStatements(tab + 1);
 373                 return s;
 374         }
 375
 376         public String toStringStatements(int tab) {
 377
 378                 if (isAbstract() || (this.modifiers & AccSemicolonBody) != 0)
 379                         return ";"; //$NON-NLS-1$
 380
 381                 String s = " {"; //$NON-NLS-1$
 382                 if (statements != null) {
 383                         for (int i = 0; i < statements.length; i++) {
 384                                 s = s + "\n" + statements[i].toString(tab); //$NON-NLS-1$
 385                                 if (!(statements[i] instanceof Block)) {
 386                                         s += ";"; //$NON-NLS-1$
 387                                 }
 388                         }
 389                 }
 390                 s += "\n" + tabString(tab == 0 ? 0 : tab - 1) + "}"; //$NON-NLS-2$ //$NON-NLS-1$
 391                 return s;
 392         }
 393
 394         public void traverse(
 395                 IAbstractSyntaxTreeVisitor visitor,
 396                 ClassScope classScope) {
 397         }
 398 }