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.codegen.CodeStream;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  17 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.ArrayBinding;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  20 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  21
  22 public class ArrayReference extends Reference {
  23
  24         public Expression receiver;
  25         public Expression position;
  26
  27         public TypeBinding arrayElementBinding;
  28
  29         public ArrayReference(Expression rec, Expression pos) {
  30                 this.receiver = rec;
  31                 this.position = pos;
  32                 sourceStart = rec.sourceStart;
  33         }
  34
  35         public FlowInfo analyseAssignment(
  36                 BlockScope currentScope,
  37                 FlowContext flowContext,
  38                 FlowInfo flowInfo,
  39                 Assignment assignment,
  40                 boolean compoundAssignment) {
  41
  42                 if (assignment.expression == null) {
  43                         return analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
  44                 } else {
  45                         return assignment
  46                                 .expression
  47                                 .analyseCode(
  48                                         currentScope,
  49                                         flowContext,
  50                                         analyseCode(currentScope, flowContext, flowInfo).unconditionalInits())
  51                                 .unconditionalInits();
  52                 }
  53         }
  54
  55         public FlowInfo analyseCode(
  56                 BlockScope currentScope,
  57                 FlowContext flowContext,
  58                 FlowInfo flowInfo) {
  59
  60                 return position.analyseCode(
  61                         currentScope,
  62                         flowContext,
  63                         receiver.analyseCode(currentScope, flowContext, flowInfo));
  64         }
  65
  66         public void generateAssignment(
  67                 BlockScope currentScope,
  68                 CodeStream codeStream,
  69                 Assignment assignment,
  70                 boolean valueRequired) {
  71
  72                 receiver.generateCode(currentScope, codeStream, true);
  73                 position.generateCode(currentScope, codeStream, true);
  74                 assignment.expression.generateCode(currentScope, codeStream, true);
  75                 codeStream.arrayAtPut(arrayElementBinding.id, valueRequired);
  76                 if (valueRequired) {
  77                         codeStream.generateImplicitConversion(assignment.implicitConversion);
  78                 }
  79         }
  80
  81         /**
  82          * Code generation for a array reference
  83          */
  84         public void generateCode(
  85                 BlockScope currentScope,
  86                 CodeStream codeStream,
  87                 boolean valueRequired) {
  88
  89                 int pc = codeStream.position;
  90                 receiver.generateCode(currentScope, codeStream, true);
  91                 position.generateCode(currentScope, codeStream, true);
  92                 codeStream.arrayAt(arrayElementBinding.id);
  93                 // Generating code for the potential runtime type checking
  94                 if (valueRequired) {
  95                         codeStream.generateImplicitConversion(implicitConversion);
  96                 } else {
  97                         if (arrayElementBinding == LongBinding
  98                                 || arrayElementBinding == DoubleBinding) {
  99                                 codeStream.pop2();
 100                         } else {
 101                                 codeStream.pop();
 102                         }
 103                 }
 104                 codeStream.recordPositionsFrom(pc, this.sourceStart);
 105         }
 106
 107         public void generateCompoundAssignment(
 108                 BlockScope currentScope,
 109                 CodeStream codeStream,
 110                 Expression expression,
 111                 int operator,
 112                 int assignmentImplicitConversion,
 113                 boolean valueRequired) {
 114
 115                 receiver.generateCode(currentScope, codeStream, true);
 116                 position.generateCode(currentScope, codeStream, true);
 117                 codeStream.dup2();
 118                 codeStream.arrayAt(arrayElementBinding.id);
 119                 int operationTypeID;
 120                 if ((operationTypeID = implicitConversion >> 4) == T_String) {
 121                         codeStream.generateStringAppend(currentScope, null, expression);
 122                 } else {
 123                         // promote the array reference to the suitable operation type
 124                         codeStream.generateImplicitConversion(implicitConversion);
 125                         // generate the increment value (will by itself  be promoted to the operation value)
 126                         if (expression == IntLiteral.One) { // prefix operation
 127                                 codeStream.generateConstant(expression.constant, implicitConversion);
 128                         } else {
 129                                 expression.generateCode(currentScope, codeStream, true);
 130                         }
 131                         // perform the operation
 132                         codeStream.sendOperator(operator, operationTypeID);
 133                         // cast the value back to the array reference type
 134                         codeStream.generateImplicitConversion(assignmentImplicitConversion);
 135                 }
 136                 codeStream.arrayAtPut(arrayElementBinding.id, valueRequired);
 137         }
 138
 139         public void generatePostIncrement(
 140                 BlockScope currentScope,
 141                 CodeStream codeStream,
 142                 CompoundAssignment postIncrement,
 143                 boolean valueRequired) {
 144
 145                 receiver.generateCode(currentScope, codeStream, true);
 146                 position.generateCode(currentScope, codeStream, true);
 147                 codeStream.dup2();
 148                 codeStream.arrayAt(arrayElementBinding.id);
 149                 if (valueRequired) {
 150                         if ((arrayElementBinding == LongBinding)
 151                                 || (arrayElementBinding == DoubleBinding)) {
 152                                 codeStream.dup2_x2();
 153                         } else {
 154                                 codeStream.dup_x2();
 155                         }
 156                 }
 157                 codeStream.generateConstant(
 158                         postIncrement.expression.constant,
 159                         implicitConversion);
 160                 codeStream.sendOperator(postIncrement.operator, arrayElementBinding.id);
 161                 codeStream.generateImplicitConversion(
 162                         postIncrement.assignmentImplicitConversion);
 163                 codeStream.arrayAtPut(arrayElementBinding.id, false);
 164         }
 165
 166         public TypeBinding resolveType(BlockScope scope) {
 167
 168                 constant = Constant.NotAConstant;
 169                 TypeBinding arrayTb = receiver.resolveType(scope);
 170                 if (arrayTb == null)
 171                         return null;
 172                 if (!arrayTb.isArrayType()) {
 173                         scope.problemReporter().referenceMustBeArrayTypeAt(arrayTb, this);
 174                         return null;
 175                 }
 176                 TypeBinding positionTb = position.resolveTypeExpecting(scope, IntBinding);
 177                 if (positionTb == null)
 178                         return null;
 179                 position.implicitWidening(IntBinding, positionTb);
 180                 return arrayElementBinding = ((ArrayBinding) arrayTb).elementsType(scope);
 181         }
 182
 183         public String toStringExpression() {
 184
 185                 return receiver.toStringExpression() + "[" //$NON-NLS-1$
 186                 +position.toStringExpression() + "]"; //$NON-NLS-1$
 187         }
 188
 189         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 190
 191                 if (visitor.visit(this, scope)) {
 192                         receiver.traverse(visitor, scope);
 193                         position.traverse(visitor, scope);
 194                 }
 195                 visitor.endVisit(this, scope);
 196         }
 197 }