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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.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 ArrayAllocationExpression extends Expression {
  23
  24         public TypeReference type;
  25
  26         //dimensions.length gives the number of dimensions, but the
  27         // last ones may be nulled as in new int[4][5][][]
  28         public Expression[] dimensions;
  29         public ArrayInitializer initializer;
  30
  31         public ArrayBinding arrayTb;
  32
  33         /**
  34          * ArrayAllocationExpression constructor comment.
  35          */
  36         public ArrayAllocationExpression() {
  37                 super();
  38         }
  39
  40         public FlowInfo analyseCode(
  41                 BlockScope currentScope,
  42                 FlowContext flowContext,
  43                 FlowInfo flowInfo) {
  44                 for (int i = 0, max = dimensions.length; i < max; i++) {
  45                         Expression dim;
  46                         if ((dim = dimensions[i]) != null) {
  47                                 flowInfo = dim.analyseCode(currentScope, flowContext, flowInfo);
  48                         }
  49                 }
  50                 if (initializer != null) {
  51                         return initializer.analyseCode(currentScope, flowContext, flowInfo);
  52                 } else {
  53                         return flowInfo;
  54                 }
  55         }
  56
  57         /**
  58          * Code generation for a array allocation expression
  59          */
  60         public void generateCode(
  61                 BlockScope currentScope,
  62                 CodeStream codeStream,
  63                 boolean valueRequired) {
  64
  65                 int pc = codeStream.position;
  66                 ArrayBinding arrayBinding;
  67
  68                 if (initializer != null) {
  69                         initializer.generateCode(currentScope, codeStream, valueRequired);
  70                         return;
  71                 }
  72
  73                 int nonNullDimensionsLength = 0;
  74                 for (int i = 0, max = dimensions.length; i < max; i++)
  75                         if (dimensions[i] != null) {
  76                                 dimensions[i].generateCode(currentScope, codeStream, true);
  77                                 nonNullDimensionsLength++;
  78                         }
  79
  80                 // Generate a sequence of bytecodes corresponding to an array allocation
  81                 if ((arrayTb.isArrayType())
  82                         && ((arrayBinding = (ArrayBinding) arrayTb).dimensions == 1)) {
  83                         // Mono-dimensional array
  84                         codeStream.newArray(currentScope, arrayBinding);
  85                 } else {
  86                         // Multi-dimensional array
  87                         codeStream.multianewarray(arrayTb, nonNullDimensionsLength);
  88                 }
  89
  90                 if (valueRequired) {
  91                         codeStream.generateImplicitConversion(implicitConversion);
  92                 } else {
  93                         codeStream.pop();
  94                 }
  95
  96                 codeStream.recordPositionsFrom(pc, this.sourceStart);
  97         }
  98
  99         public TypeBinding resolveType(BlockScope scope) {
 100
 101                 // Build an array type reference using the current dimensions
 102                 // The parser does not check for the fact that dimension may be null
 103                 // only at the -end- like new int [4][][]. The parser allows new int[][4][]
 104                 // so this must be checked here......(this comes from a reduction to LL1 grammar)
 105
 106                 TypeBinding referenceTb = type.resolveType(scope);
 107                 // will check for null after dimensions are checked
 108                 constant = Constant.NotAConstant;
 109                 if (referenceTb == VoidBinding) {
 110                         scope.problemReporter().cannotAllocateVoidArray(this);
 111                         referenceTb = null; // will return below
 112                 }
 113
 114                 // check the validity of the dimension syntax (and test for all null dimensions)
 115                 int lengthDim = -1;
 116                 for (int i = dimensions.length; --i >= 0;) {
 117                         if (dimensions[i] != null) {
 118                                 if (lengthDim == -1)
 119                                         lengthDim = i;
 120                         } else if (
 121                                 lengthDim != -1) {
 122                                 // should not have an empty dimension before an non-empty one
 123                                 scope.problemReporter().incorrectLocationForEmptyDimension(this, i);
 124                                 return null;
 125                         }
 126                 }
 127                 if (referenceTb == null)
 128                         return null;
 129
 130                 // lengthDim == -1 says if all dimensions are nulled
 131                 // when an initializer is given, no dimension must be specified
 132                 if (initializer == null) {
 133                         if (lengthDim == -1) {
 134                                 scope.problemReporter().mustDefineDimensionsOrInitializer(this);
 135                                 return null;
 136                         }
 137                 } else if (lengthDim != -1) {
 138                         scope.problemReporter().cannotDefineDimensionsAndInitializer(this);
 139                         return null;
 140                 }
 141
 142                 // dimensions resolution
 143                 for (int i = 0; i <= lengthDim; i++) {
 144                         TypeBinding dimTb = dimensions[i].resolveTypeExpecting(scope, IntBinding);
 145                         if (dimTb == null)
 146                                 return null;
 147                         dimensions[i].implicitWidening(IntBinding, dimTb);
 148                 }
 149
 150                 // building the array binding
 151                 arrayTb = scope.createArray(referenceTb, dimensions.length);
 152
 153                 // check the initializer
 154                 if (initializer != null)
 155                         if ((initializer.resolveTypeExpecting(scope, arrayTb)) != null)
 156                                 initializer.binding = arrayTb;
 157                 return arrayTb;
 158         }
 159
 160         public String toStringExpression() {
 161
 162                 String s = "new " + type.toString(0); //$NON-NLS-1$
 163                 for (int i = 0; i < dimensions.length; i++) {
 164                         if (dimensions[i] == null)
 165                                 s = s + "[]"; //$NON-NLS-1$
 166                         else
 167                                 s = s + "[" + dimensions[i].toStringExpression() + "]"; //$NON-NLS-2$ //$NON-NLS-1$
 168                 }
 169                 if (initializer != null)
 170                         s = s + initializer.toStringExpression();
 171                 return s;
 172         }
 173
 174         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 175
 176                 if (visitor.visit(this, scope)) {
 177                         int dimensionsLength = dimensions.length;
 178                         type.traverse(visitor, scope);
 179                         for (int i = 0; i < dimensionsLength; i++) {
 180                                 if (dimensions[i] != null)
 181                                         dimensions[i].traverse(visitor, scope);
 182                         }
 183                         if (initializer != null)
 184                                 initializer.traverse(visitor, scope);
 185                 }
 186                 visitor.endVisit(this, scope);
 187         }
 188 }