net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/ArrayReference.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 ArrayReference extends Reference {
  20
  21         public Expression receiver;
  22         public Expression position;
  23
  24         public TypeBinding arrayElementBinding;
  25
  26         public ArrayReference(Expression rec, Expression pos) {
  27                 this.receiver = rec;
  28                 this.position = pos;
  29                 sourceStart = rec.sourceStart;
  30         }
  31
  32         public FlowInfo analyseAssignment(
  33                 BlockScope currentScope,
  34                 FlowContext flowContext,
  35                 FlowInfo flowInfo,
  36                 Assignment assignment,
  37                 boolean compoundAssignment) {
  38
  39                 if (assignment.expression == null) {
  40                         return analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
  41                 } else {
  42                         return assignment
  43                                 .expression
  44                                 .analyseCode(
  45                                         currentScope,
  46                                         flowContext,
  47                                         analyseCode(currentScope, flowContext, flowInfo).unconditionalInits())
  48                                 .unconditionalInits();
  49                 }
  50         }
  51
  52         public FlowInfo analyseCode(
  53                 BlockScope currentScope,
  54                 FlowContext flowContext,
  55                 FlowInfo flowInfo) {
  56
  57                 return position.analyseCode(
  58                         currentScope,
  59                         flowContext,
  60                         receiver.analyseCode(currentScope, flowContext, flowInfo));
  61         }
  62
  63         public void generateAssignment(
  64                 BlockScope currentScope,
  65                 CodeStream codeStream,
  66                 Assignment assignment,
  67                 boolean valueRequired) {
  68
  69                 receiver.generateCode(currentScope, codeStream, true);
  70                 position.generateCode(currentScope, codeStream, true);
  71                 assignment.expression.generateCode(currentScope, codeStream, true);
  72                 codeStream.arrayAtPut(arrayElementBinding.id, valueRequired);
  73                 if (valueRequired) {
  74                         codeStream.generateImplicitConversion(assignment.implicitConversion);
  75                 }
  76         }
  77
  78         /**
  79          * Code generation for a array reference
  80          */
  81         public void generateCode(
  82                 BlockScope currentScope,
  83                 CodeStream codeStream,
  84                 boolean valueRequired) {
  85
  86                 int pc = codeStream.position;
  87                 receiver.generateCode(currentScope, codeStream, true);
  88                 position.generateCode(currentScope, codeStream, true);
  89                 codeStream.arrayAt(arrayElementBinding.id);
  90                 // Generating code for the potential runtime type checking
  91                 if (valueRequired) {
  92                         codeStream.generateImplicitConversion(implicitConversion);
  93                 } else {
  94                         if (arrayElementBinding == LongBinding
  95                                 || arrayElementBinding == DoubleBinding) {
  96                                 codeStream.pop2();
  97                         } else {
  98                                 codeStream.pop();
  99                         }
 100                 }
 101                 codeStream.recordPositionsFrom(pc, this.sourceStart);
 102         }
 103
 104         public void generateCompoundAssignment(
 105                 BlockScope currentScope,
 106                 CodeStream codeStream,
 107                 Expression expression,
 108                 int operator,
 109                 int assignmentImplicitConversion,
 110                 boolean valueRequired) {
 111
 112                 receiver.generateCode(currentScope, codeStream, true);
 113                 position.generateCode(currentScope, codeStream, true);
 114                 codeStream.dup2();
 115                 codeStream.arrayAt(arrayElementBinding.id);
 116                 int operationTypeID;
 117                 if ((operationTypeID = implicitConversion >> 4) == T_String) {
 118                         codeStream.generateStringAppend(currentScope, null, expression);
 119                 } else {
 120                         // promote the array reference to the suitable operation type
 121                         codeStream.generateImplicitConversion(implicitConversion);
 122                         // generate the increment value (will by itself  be promoted to the operation value)
 123                         if (expression == IntLiteral.One) { // prefix operation
 124                                 codeStream.generateConstant(expression.constant, implicitConversion);
 125                         } else {
 126                                 expression.generateCode(currentScope, codeStream, true);
 127                         }
 128                         // perform the operation
 129                         codeStream.sendOperator(operator, operationTypeID);
 130                         // cast the value back to the array reference type
 131                         codeStream.generateImplicitConversion(assignmentImplicitConversion);
 132                 }
 133                 codeStream.arrayAtPut(arrayElementBinding.id, valueRequired);
 134         }
 135
 136         public void generatePostIncrement(
 137                 BlockScope currentScope,
 138                 CodeStream codeStream,
 139                 CompoundAssignment postIncrement,
 140                 boolean valueRequired) {
 141
 142                 receiver.generateCode(currentScope, codeStream, true);
 143                 position.generateCode(currentScope, codeStream, true);
 144                 codeStream.dup2();
 145                 codeStream.arrayAt(arrayElementBinding.id);
 146                 if (valueRequired) {
 147                         if ((arrayElementBinding == LongBinding)
 148                                 || (arrayElementBinding == DoubleBinding)) {
 149                                 codeStream.dup2_x2();
 150                         } else {
 151                                 codeStream.dup_x2();
 152                         }
 153                 }
 154                 codeStream.generateConstant(
 155                         postIncrement.expression.constant,
 156                         implicitConversion);
 157                 codeStream.sendOperator(postIncrement.operator, arrayElementBinding.id);
 158                 codeStream.generateImplicitConversion(
 159                         postIncrement.assignmentImplicitConversion);
 160                 codeStream.arrayAtPut(arrayElementBinding.id, false);
 161         }
 162
 163         public TypeBinding resolveType(BlockScope scope) {
 164
 165                 constant = Constant.NotAConstant;
 166                 TypeBinding arrayTb = receiver.resolveType(scope);
 167                 if (arrayTb == null)
 168                         return null;
 169                 if (!arrayTb.isArrayType()) {
 170                         scope.problemReporter().referenceMustBeArrayTypeAt(arrayTb, this);
 171                         return null;
 172                 }
 173                 TypeBinding positionTb = position.resolveTypeExpecting(scope, IntBinding);
 174                 if (positionTb == null)
 175                         return null;
 176                 position.implicitWidening(IntBinding, positionTb);
 177                 return arrayElementBinding = ((ArrayBinding) arrayTb).elementsType(scope);
 178         }
 179
 180         public String toStringExpression() {
 181
 182                 return receiver.toStringExpression() + "[" //$NON-NLS-1$
 183                 +position.toStringExpression() + "]"; //$NON-NLS-1$
 184         }
 185
 186         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 187
 188                 if (visitor.visit(this, scope)) {
 189                         receiver.traverse(visitor, scope);
 190                         position.traverse(visitor, scope);
 191                 }
 192                 visitor.endVisit(this, scope);
 193         }
 194 }