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.codegen.CodeStream;
  15 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  17 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  18 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  21
  22 public class UnaryExpression extends OperatorExpression {
  23
  24         public Expression expression;
  25         public Constant optimizedBooleanConstant;
  26
  27         public UnaryExpression(Expression expression, int operator) {
  28                 this.expression = expression;
  29                 this.bits |= operator << OperatorSHIFT; // encode operator
  30         }
  31
  32         public FlowInfo analyseCode(
  33                 BlockScope currentScope,
  34                 FlowContext flowContext,
  35                 FlowInfo flowInfo) {
  36                 if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) {
  37                         return expression
  38                                 .analyseCode(currentScope, flowContext, flowInfo)
  39                                 .asNegatedCondition();
  40                 } else {
  41                         return expression.analyseCode(currentScope, flowContext, flowInfo);
  42                 }
  43         }
  44
  45         public Constant conditionalConstant() {
  46                 return optimizedBooleanConstant == null ? constant : optimizedBooleanConstant;
  47         }
  48
  49         /**
  50          * Code generation for an unary operation
  51          *
  52          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  53          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  54          * @param valueRequired boolean
  55          */
  56         public void generateCode(
  57                 BlockScope currentScope,
  58                 CodeStream codeStream,
  59                 boolean valueRequired) {
  60                 int pc = codeStream.position;
  61                 Label falseLabel, endifLabel;
  62                 if (constant != Constant.NotAConstant) {
  63                         // inlined value
  64                         if (valueRequired) {
  65                                 codeStream.generateConstant(constant, implicitConversion);
  66                         }
  67                         codeStream.recordPositionsFrom(pc, this.sourceStart);
  68                         return;
  69                 }
  70                 switch ((bits & OperatorMASK) >> OperatorSHIFT) {
  71                         case NOT :
  72                                 switch (expression.implicitConversion >> 4) /* runtime type */ {
  73                                         case T_boolean :
  74                                                 // ! <boolean>
  75                                                 // Generate code for the condition
  76                                                 expression.generateOptimizedBoolean(
  77                                                         currentScope,
  78                                                         codeStream,
  79                                                         null,
  80                                                         (falseLabel = new Label(codeStream)),
  81                                                         valueRequired);
  82                                                 if (valueRequired) {
  83                                                         codeStream.iconst_0();
  84                                                         if (falseLabel.hasForwardReferences()) {
  85                                                                 codeStream.goto_(endifLabel = new Label(codeStream));
  86                                                                 codeStream.decrStackSize(1);
  87                                                                 falseLabel.place();
  88                                                                 codeStream.iconst_1();
  89                                                                 endifLabel.place();
  90                                                         }
  91                                                 } else { // 6596: if (!(a && b)){} - must still place falseLabel
  92                                                         falseLabel.place();
  93                                                 }
  94                                                 break;
  95                                 }
  96                                 break;
  97                         case TWIDDLE :
  98                                 switch (expression.implicitConversion >> 4 /* runtime */
  99                                         ) {
 100                                         case T_int :
 101                                                 // ~int
 102                                                 expression.generateCode(currentScope, codeStream, valueRequired);
 103                                                 if (valueRequired) {
 104                                                         codeStream.iconst_m1();
 105                                                         codeStream.ixor();
 106                                                 }
 107                                                 break;
 108                                         case T_long :
 109                                                 expression.generateCode(currentScope, codeStream, valueRequired);
 110                                                 if (valueRequired) {
 111                                                         codeStream.ldc2_w(-1L);
 112                                                         codeStream.lxor();
 113                                                 }
 114                                 }
 115                                 break;
 116                         case MINUS :
 117                                 // - <num>
 118                                 if (constant != NotAConstant) {
 119                                         if (valueRequired) {
 120                                                 switch (expression.implicitConversion >> 4 /* runtime */
 121                                                         ) {
 122                                                         case T_int :
 123                                                                 codeStream.generateInlinedValue(constant.intValue() * -1);
 124                                                                 break;
 125                                                         case T_float :
 126                                                                 codeStream.generateInlinedValue(constant.floatValue() * -1.0f);
 127                                                                 break;
 128                                                         case T_long :
 129                                                                 codeStream.generateInlinedValue(constant.longValue() * -1L);
 130                                                                 break;
 131                                                         case T_double :
 132                                                                 codeStream.generateInlinedValue(constant.doubleValue() * -1.0);
 133                                                 }
 134                                         }
 135                                 } else {
 136                                         expression.generateCode(currentScope, codeStream, valueRequired);
 137                                         if (valueRequired) {
 138                                                 switch (expression.implicitConversion >> 4 /* runtime type */
 139                                                         ) {
 140                                                         case T_int :
 141                                                                 codeStream.ineg();
 142                                                                 break;
 143                                                         case T_float :
 144                                                                 codeStream.fneg();
 145                                                                 break;
 146                                                         case T_long :
 147                                                                 codeStream.lneg();
 148                                                                 break;
 149                                                         case T_double :
 150                                                                 codeStream.dneg();
 151                                                 }
 152                                         }
 153                                 }
 154                                 break;
 155                         case PLUS :
 156                                 expression.generateCode(currentScope, codeStream, valueRequired);
 157                 }
 158                 if (valueRequired) {
 159                         codeStream.generateImplicitConversion(implicitConversion);
 160                 }
 161                 codeStream.recordPositionsFrom(pc, this.sourceStart);
 162         }
 163
 164         /**
 165          * Boolean operator code generation
 166          *      Optimized operations are: &&, ||, <, <=, >, >=, &, |, ^
 167          */
 168         public void generateOptimizedBoolean(
 169                 BlockScope currentScope,
 170                 CodeStream codeStream,
 171                 Label trueLabel,
 172                 Label falseLabel,
 173                 boolean valueRequired) {
 174
 175                 if ((constant != Constant.NotAConstant) && (constant.typeID() == T_boolean)) {
 176                         super.generateOptimizedBoolean(
 177                                 currentScope,
 178                                 codeStream,
 179                                 trueLabel,
 180                                 falseLabel,
 181                                 valueRequired);
 182                         return;
 183                 }
 184                 if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) {
 185                         expression.generateOptimizedBoolean(
 186                                 currentScope,
 187                                 codeStream,
 188                                 falseLabel,
 189                                 trueLabel,
 190                                 valueRequired);
 191                 } else {
 192                         super.generateOptimizedBoolean(
 193                                 currentScope,
 194                                 codeStream,
 195                                 trueLabel,
 196                                 falseLabel,
 197                                 valueRequired);
 198                 }
 199         }
 200
 201         public TypeBinding resolveType(BlockScope scope) {
 202                 TypeBinding expressionTb = expression.resolveType(scope);
 203                 if (expressionTb == null) {
 204                         constant = NotAConstant;
 205                         return null;
 206                 }
 207                 int expressionId = expressionTb.id;
 208                 if (expressionId > 15) {
 209                         constant = NotAConstant;
 210                         scope.problemReporter().invalidOperator(this, expressionTb);
 211                         return null;
 212                 }
 213
 214                 int tableId;
 215                 switch ((bits & OperatorMASK) >> OperatorSHIFT) {
 216                         case NOT :
 217                                 tableId = AND_AND;
 218                                 break;
 219                         case TWIDDLE :
 220                                 tableId = LEFT_SHIFT;
 221                                 break;
 222                         default :
 223                                 tableId = MINUS;
 224                 } //+ and - cases
 225
 226                 // the code is an int
 227                 // (cast)  left   Op (cast)  rigth --> result
 228                 //  0000   0000       0000   0000      0000
 229                 //  <<16   <<12       <<8    <<4       <<0
 230                 int result = ResolveTypeTables[tableId][(expressionId << 4) + expressionId];
 231                 expression.implicitConversion = result >>> 12;
 232                 bits |= result & 0xF;
 233                 switch (result & 0xF) { // only switch on possible result type.....
 234                         case T_boolean :
 235                                 this.typeBinding = BooleanBinding;
 236                                 break;
 237                         case T_byte :
 238                                 this.typeBinding = ByteBinding;
 239                                 break;
 240                         case T_char :
 241                                 this.typeBinding = CharBinding;
 242                                 break;
 243                         case T_double :
 244                                 this.typeBinding = DoubleBinding;
 245                                 break;
 246                         case T_float :
 247                                 this.typeBinding = FloatBinding;
 248                                 break;
 249                         case T_int :
 250                                 this.typeBinding = IntBinding;
 251                                 break;
 252                         case T_long :
 253                                 this.typeBinding = LongBinding;
 254                                 break;
 255                         default : //error........
 256                                 constant = Constant.NotAConstant;
 257                                 if (expressionId != T_undefined)
 258                                         scope.problemReporter().invalidOperator(this, expressionTb);
 259                                 return null;
 260                 }
 261                 // compute the constant when valid
 262                 if (expression.constant != Constant.NotAConstant) {
 263                         constant =
 264                                 Constant.computeConstantOperation(
 265                                         expression.constant,
 266                                         expressionId,
 267                                         (bits & OperatorMASK) >> OperatorSHIFT);
 268                 } else {
 269                         constant = Constant.NotAConstant;
 270                         if (((bits & OperatorMASK) >> OperatorSHIFT) == NOT) {
 271                                 Constant cst = expression.conditionalConstant();
 272                                 if (cst.typeID() == T_boolean)
 273                                         optimizedBooleanConstant = Constant.fromValue(!cst.booleanValue());
 274                         }
 275                 }
 276                 return this.typeBinding;
 277         }
 278
 279         public String toStringExpressionNoParenthesis() {
 280                 return operatorToString() + " " + expression.toStringExpression(); //$NON-NLS-1$
 281         }
 282
 283         public void traverse(
 284                 IAbstractSyntaxTreeVisitor visitor,
 285                 BlockScope blockScope) {
 286                 if (visitor.visit(this, blockScope)) {
 287                         expression.traverse(visitor, blockScope);
 288                 }
 289                 visitor.endVisit(this, blockScope);
 290         }
 291 }