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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.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 ArrayAllocationExpression extends Expression {
  20
  21         public TypeReference type;
  22
  23         //dimensions.length gives the number of dimensions, but the
  24         // last ones may be nulled as in new int[4][5][][]
  25         public Expression[] dimensions;
  26         public ArrayInitializer initializer;
  27
  28         public ArrayBinding arrayTb;
  29
  30         /**
  31          * ArrayAllocationExpression constructor comment.
  32          */
  33         public ArrayAllocationExpression() {
  34                 super();
  35         }
  36
  37         public FlowInfo analyseCode(
  38                 BlockScope currentScope,
  39                 FlowContext flowContext,
  40                 FlowInfo flowInfo) {
  41                 for (int i = 0, max = dimensions.length; i < max; i++) {
  42                         Expression dim;
  43                         if ((dim = dimensions[i]) != null) {
  44                                 flowInfo = dim.analyseCode(currentScope, flowContext, flowInfo);
  45                         }
  46                 }
  47                 if (initializer != null) {
  48                         return initializer.analyseCode(currentScope, flowContext, flowInfo);
  49                 } else {
  50                         return flowInfo;
  51                 }
  52         }
  53
  54         /**
  55          * Code generation for a array allocation expression
  56          */
  57         public void generateCode(
  58                 BlockScope currentScope,
  59                 CodeStream codeStream,
  60                 boolean valueRequired) {
  61
  62                 int pc = codeStream.position;
  63                 ArrayBinding arrayBinding;
  64
  65                 if (initializer != null) {
  66                         initializer.generateCode(currentScope, codeStream, valueRequired);
  67                         return;
  68                 }
  69
  70                 int nonNullDimensionsLength = 0;
  71                 for (int i = 0, max = dimensions.length; i < max; i++)
  72                         if (dimensions[i] != null) {
  73                                 dimensions[i].generateCode(currentScope, codeStream, true);
  74                                 nonNullDimensionsLength++;
  75                         }
  76
  77                 // Generate a sequence of bytecodes corresponding to an array allocation
  78                 if ((arrayTb.isArrayType())
  79                         && ((arrayBinding = (ArrayBinding) arrayTb).dimensions == 1)) {
  80                         // Mono-dimensional array
  81                         codeStream.newArray(currentScope, arrayBinding);
  82                 } else {
  83                         // Multi-dimensional array
  84                         codeStream.multianewarray(arrayTb, nonNullDimensionsLength);
  85                 }
  86
  87                 if (valueRequired) {
  88                         codeStream.generateImplicitConversion(implicitConversion);
  89                 } else {
  90                         codeStream.pop();
  91                 }
  92
  93                 codeStream.recordPositionsFrom(pc, this.sourceStart);
  94         }
  95
  96         public TypeBinding resolveType(BlockScope scope) {
  97
  98                 // Build an array type reference using the current dimensions
  99                 // The parser does not check for the fact that dimension may be null
 100                 // only at the -end- like new int [4][][]. The parser allows new int[][4][]
 101                 // so this must be checked here......(this comes from a reduction to LL1 grammar)
 102
 103                 TypeBinding referenceTb = type.resolveType(scope);
 104                 // will check for null after dimensions are checked
 105                 constant = Constant.NotAConstant;
 106                 if (referenceTb == VoidBinding) {
 107                         scope.problemReporter().cannotAllocateVoidArray(this);
 108                         referenceTb = null; // will return below
 109                 }
 110
 111                 // check the validity of the dimension syntax (and test for all null dimensions)
 112                 int lengthDim = -1;
 113                 for (int i = dimensions.length; --i >= 0;) {
 114                         if (dimensions[i] != null) {
 115                                 if (lengthDim == -1)
 116                                         lengthDim = i;
 117                         } else if (
 118                                 lengthDim != -1) {
 119                                 // should not have an empty dimension before an non-empty one
 120                                 scope.problemReporter().incorrectLocationForEmptyDimension(this, i);
 121                                 return null;
 122                         }
 123                 }
 124                 if (referenceTb == null)
 125                         return null;
 126
 127                 // lengthDim == -1 says if all dimensions are nulled
 128                 // when an initializer is given, no dimension must be specified
 129                 if (initializer == null) {
 130                         if (lengthDim == -1) {
 131                                 scope.problemReporter().mustDefineDimensionsOrInitializer(this);
 132                                 return null;
 133                         }
 134                 } else if (lengthDim != -1) {
 135                         scope.problemReporter().cannotDefineDimensionsAndInitializer(this);
 136                         return null;
 137                 }
 138
 139                 // dimensions resolution
 140                 for (int i = 0; i <= lengthDim; i++) {
 141                         TypeBinding dimTb = dimensions[i].resolveTypeExpecting(scope, IntBinding);
 142                         if (dimTb == null)
 143                                 return null;
 144                         dimensions[i].implicitWidening(IntBinding, dimTb);
 145                 }
 146
 147                 // building the array binding
 148                 arrayTb = scope.createArray(referenceTb, dimensions.length);
 149
 150                 // check the initializer
 151                 if (initializer != null)
 152                         if ((initializer.resolveTypeExpecting(scope, arrayTb)) != null)
 153                                 initializer.binding = arrayTb;
 154                 return arrayTb;
 155         }
 156
 157         public String toStringExpression() {
 158
 159                 String s = "new " + type.toString(0); //$NON-NLS-1$
 160                 for (int i = 0; i < dimensions.length; i++) {
 161                         if (dimensions[i] == null)
 162                                 s = s + "[]"; //$NON-NLS-1$
 163                         else
 164                                 s = s + "[" + dimensions[i].toStringExpression() + "]"; //$NON-NLS-2$ //$NON-NLS-1$
 165                 }
 166                 if (initializer != null)
 167                         s = s + initializer.toStringExpression();
 168                 return s;
 169         }
 170
 171         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 172
 173                 if (visitor.visit(this, scope)) {
 174                         int dimensionsLength = dimensions.length;
 175                         type.traverse(visitor, scope);
 176                         for (int i = 0; i < dimensionsLength; i++) {
 177                                 if (dimensions[i] != null)
 178                                         dimensions[i].traverse(visitor, scope);
 179                         }
 180                         if (initializer != null)
 181                                 initializer.traverse(visitor, scope);
 182                 }
 183                 visitor.endVisit(this, scope);
 184         }
 185 }