net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/UnaryExpression.java

   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.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.impl.*;
  15 import net.sourceforge.phpdt.internal.compiler.codegen.*;
  16 import net.sourceforge.phpdt.internal.compiler.flow.*;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.*;
  18
  19 public class UnaryExpression extends OperatorExpression {
  20
  21         public Expression expression;
  22         public Constant optimizedBooleanConstant;
  23
  24         public UnaryExpression(Expression expression, int operator) {
  25                 this.expression = expression;
  26                 this.bits |= operator << OperatorSHIFT; // encode operator
  27         }
  28
  29         public FlowInfo analyseCode(
  30                 BlockScope currentScope,
  31                 FlowContext flowContext,
  32                 FlowInfo flowInfo) {
  33                 if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) {
  34                         return expression
  35                                 .analyseCode(currentScope, flowContext, flowInfo)
  36                                 .asNegatedCondition();
  37                 } else {
  38                         return expression.analyseCode(currentScope, flowContext, flowInfo);
  39                 }
  40         }
  41
  42         public Constant conditionalConstant() {
  43                 return optimizedBooleanConstant == null ? constant : optimizedBooleanConstant;
  44         }
  45
  46         /**
  47          * Code generation for an unary operation
  48          *
  49          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  50          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  51          * @param valueRequired boolean
  52          */
  53         public void generateCode(
  54                 BlockScope currentScope,
  55                 CodeStream codeStream,
  56                 boolean valueRequired) {
  57                 int pc = codeStream.position;
  58                 Label falseLabel, endifLabel;
  59                 if (constant != Constant.NotAConstant) {
  60                         // inlined value
  61                         if (valueRequired) {
  62                                 codeStream.generateConstant(constant, implicitConversion);
  63                         }
  64                         codeStream.recordPositionsFrom(pc, this.sourceStart);
  65                         return;
  66                 }
  67                 switch ((bits & OperatorMASK) >> OperatorSHIFT) {
  68                         case NOT :
  69                                 switch (expression.implicitConversion >> 4) /* runtime type */ {
  70                                         case T_boolean :
  71                                                 // ! <boolean>
  72                                                 // Generate code for the condition
  73                                                 expression.generateOptimizedBoolean(
  74                                                         currentScope,
  75                                                         codeStream,
  76                                                         null,
  77                                                         (falseLabel = new Label(codeStream)),
  78                                                         valueRequired);
  79                                                 if (valueRequired) {
  80                                                         codeStream.iconst_0();
  81                                                         if (falseLabel.hasForwardReferences()) {
  82                                                                 codeStream.goto_(endifLabel = new Label(codeStream));
  83                                                                 codeStream.decrStackSize(1);
  84                                                                 falseLabel.place();
  85                                                                 codeStream.iconst_1();
  86                                                                 endifLabel.place();
  87                                                         }
  88                                                 } else { // 6596: if (!(a && b)){} - must still place falseLabel
  89                                                         falseLabel.place();
  90                                                 }
  91                                                 break;
  92                                 }
  93                                 break;
  94                         case TWIDDLE :
  95                                 switch (expression.implicitConversion >> 4 /* runtime */
  96                                         ) {
  97                                         case T_int :
  98                                                 // ~int
  99                                                 expression.generateCode(currentScope, codeStream, valueRequired);
 100                                                 if (valueRequired) {
 101                                                         codeStream.iconst_m1();
 102                                                         codeStream.ixor();
 103                                                 }
 104                                                 break;
 105                                         case T_long :
 106                                                 expression.generateCode(currentScope, codeStream, valueRequired);
 107                                                 if (valueRequired) {
 108                                                         codeStream.ldc2_w(-1L);
 109                                                         codeStream.lxor();
 110                                                 }
 111                                 }
 112                                 break;
 113                         case MINUS :
 114                                 // - <num>
 115                                 if (constant != NotAConstant) {
 116                                         if (valueRequired) {
 117                                                 switch (expression.implicitConversion >> 4 /* runtime */
 118                                                         ) {
 119                                                         case T_int :
 120                                                                 codeStream.generateInlinedValue(constant.intValue() * -1);
 121                                                                 break;
 122                                                         case T_float :
 123                                                                 codeStream.generateInlinedValue(constant.floatValue() * -1.0f);
 124                                                                 break;
 125                                                         case T_long :
 126                                                                 codeStream.generateInlinedValue(constant.longValue() * -1L);
 127                                                                 break;
 128                                                         case T_double :
 129                                                                 codeStream.generateInlinedValue(constant.doubleValue() * -1.0);
 130                                                 }
 131                                         }
 132                                 } else {
 133                                         expression.generateCode(currentScope, codeStream, valueRequired);
 134                                         if (valueRequired) {
 135                                                 switch (expression.implicitConversion >> 4 /* runtime type */
 136                                                         ) {
 137                                                         case T_int :
 138                                                                 codeStream.ineg();
 139                                                                 break;
 140                                                         case T_float :
 141                                                                 codeStream.fneg();
 142                                                                 break;
 143                                                         case T_long :
 144                                                                 codeStream.lneg();
 145                                                                 break;
 146                                                         case T_double :
 147                                                                 codeStream.dneg();
 148                                                 }
 149                                         }
 150                                 }
 151                                 break;
 152                         case PLUS :
 153                                 expression.generateCode(currentScope, codeStream, valueRequired);
 154                 }
 155                 if (valueRequired) {
 156                         codeStream.generateImplicitConversion(implicitConversion);
 157                 }
 158                 codeStream.recordPositionsFrom(pc, this.sourceStart);
 159         }
 160
 161         /**
 162          * Boolean operator code generation
 163          *      Optimized operations are: &&, ||, <, <=, >, >=, &, |, ^
 164          */
 165         public void generateOptimizedBoolean(
 166                 BlockScope currentScope,
 167                 CodeStream codeStream,
 168                 Label trueLabel,
 169                 Label falseLabel,
 170                 boolean valueRequired) {
 171
 172                 if ((constant != Constant.NotAConstant) && (constant.typeID() == T_boolean)) {
 173                         super.generateOptimizedBoolean(
 174                                 currentScope,
 175                                 codeStream,
 176                                 trueLabel,
 177                                 falseLabel,
 178                                 valueRequired);
 179                         return;
 180                 }
 181                 if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) {
 182                         expression.generateOptimizedBoolean(
 183                                 currentScope,
 184                                 codeStream,
 185                                 falseLabel,
 186                                 trueLabel,
 187                                 valueRequired);
 188                 } else {
 189                         super.generateOptimizedBoolean(
 190                                 currentScope,
 191                                 codeStream,
 192                                 trueLabel,
 193                                 falseLabel,
 194                                 valueRequired);
 195                 }
 196         }
 197
 198         public TypeBinding resolveType(BlockScope scope) {
 199                 TypeBinding expressionTb = expression.resolveType(scope);
 200                 if (expressionTb == null) {
 201                         constant = NotAConstant;
 202                         return null;
 203                 }
 204                 int expressionId = expressionTb.id;
 205                 if (expressionId > 15) {
 206                         constant = NotAConstant;
 207                         scope.problemReporter().invalidOperator(this, expressionTb);
 208                         return null;
 209                 }
 210
 211                 int tableId;
 212                 switch ((bits & OperatorMASK) >> OperatorSHIFT) {
 213                         case NOT :
 214                                 tableId = AND_AND;
 215                                 break;
 216                         case TWIDDLE :
 217                                 tableId = LEFT_SHIFT;
 218                                 break;
 219                         default :
 220                                 tableId = MINUS;
 221                 } //+ and - cases
 222
 223                 // the code is an int
 224                 // (cast)  left   Op (cast)  rigth --> result
 225                 //  0000   0000       0000   0000      0000
 226                 //  <<16   <<12       <<8    <<4       <<0
 227                 int result = ResolveTypeTables[tableId][(expressionId << 4) + expressionId];
 228                 expression.implicitConversion = result >>> 12;
 229                 bits |= result & 0xF;
 230                 switch (result & 0xF) { // only switch on possible result type.....
 231                         case T_boolean :
 232                                 this.typeBinding = BooleanBinding;
 233                                 break;
 234                         case T_byte :
 235                                 this.typeBinding = ByteBinding;
 236                                 break;
 237                         case T_char :
 238                                 this.typeBinding = CharBinding;
 239                                 break;
 240                         case T_double :
 241                                 this.typeBinding = DoubleBinding;
 242                                 break;
 243                         case T_float :
 244                                 this.typeBinding = FloatBinding;
 245                                 break;
 246                         case T_int :
 247                                 this.typeBinding = IntBinding;
 248                                 break;
 249                         case T_long :
 250                                 this.typeBinding = LongBinding;
 251                                 break;
 252                         default : //error........
 253                                 constant = Constant.NotAConstant;
 254                                 if (expressionId != T_undefined)
 255                                         scope.problemReporter().invalidOperator(this, expressionTb);
 256                                 return null;
 257                 }
 258                 // compute the constant when valid
 259                 if (expression.constant != Constant.NotAConstant) {
 260                         constant =
 261                                 Constant.computeConstantOperation(
 262                                         expression.constant,
 263                                         expressionId,
 264                                         (bits & OperatorMASK) >> OperatorSHIFT);
 265                 } else {
 266                         constant = Constant.NotAConstant;
 267                         if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) {
 268                                 Constant cst = expression.conditionalConstant();
 269                                 if (cst.typeID() == T_boolean)
 270                                         optimizedBooleanConstant = Constant.fromValue(!cst.booleanValue());
 271                         }
 272                 }
 273                 return this.typeBinding;
 274         }
 275
 276         public String toStringExpressionNoParenthesis() {
 277                 return operatorToString() + " " + expression.toStringExpression(); //$NON-NLS-1$
 278         }
 279
 280         public void traverse(
 281                 IAbstractSyntaxTreeVisitor visitor,
 282                 BlockScope blockScope) {
 283                 if (visitor.visit(this, blockScope)) {
 284                         expression.traverse(visitor, blockScope);
 285                 }
 286                 visitor.endVisit(this, blockScope);
 287         }
 288 }