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72
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1 module dmd.IndexExp;
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2
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3 import dmd.Expression;
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4 import dmd.backend.elem;
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5 import dmd.InterState;
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6 import dmd.OutBuffer;
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7 import dmd.Loc;
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8 import dmd.Scope;
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9 import dmd.VarDeclaration;
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0
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10 import dmd.InlineDoState;
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11 import dmd.Type;
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12 import dmd.ScopeDsymbol;
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13 import dmd.TY;
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14 import dmd.ArrayScopeSymbol;
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15 import dmd.TypeNext;
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16 import dmd.TypeSArray;
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17 import dmd.TypeAArray;
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72
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18 import dmd.UnaExp;
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19 import dmd.IRState;
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20 import dmd.BinExp;
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21 import dmd.HdrGenState;
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0
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22 import dmd.TOK;
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23 import dmd.WANT;
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24 import dmd.TupleExp;
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25 import dmd.TypeTuple;
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26 import dmd.Argument;
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27 import dmd.TypeExp;
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28 import dmd.VarExp;
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29 import dmd.STC;
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30 import dmd.GlobalExpressions;
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31 import dmd.ExpInitializer;
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32 import dmd.Global;
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33
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34 import dmd.expression.util.arrayTypeCompatible;
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35 import dmd.expression.Util;
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36 import dmd.expression.Index;
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37
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38 import dmd.backend.Symbol;
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39 import dmd.backend.Util;
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40 import dmd.codegen.Util;
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41 import dmd.backend.OPER;
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42 import dmd.backend.mTY;
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43 import dmd.backend.TYM;
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44
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72
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45 import core.stdc.string;
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46
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0
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47 class IndexExp : BinExp
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48 {
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49 VarDeclaration lengthVar;
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50 int modifiable = 0; // assume it is an rvalue
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51
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52 this(Loc loc, Expression e1, Expression e2)
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53 {
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54 super(loc, TOK.TOKindex, IndexExp.sizeof, e1, e2);
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55 //printf("IndexExp.IndexExp('%s')\n", toChars());
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56 }
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57
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72
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58 override Expression semantic(Scope sc)
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0
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59 {
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60 Expression e;
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61 BinExp b;
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62 UnaExp u;
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63 Type t1;
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64 ScopeDsymbol sym;
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65
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66 version (LOGSEMANTIC) {
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67 printf("IndexExp.semantic('%s')\n", toChars());
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68 }
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69 if (type)
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70 return this;
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71 if (!e1.type)
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72 e1 = e1.semantic(sc);
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73 assert(e1.type); // semantic() should already be run on it
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74 e = this;
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75
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76 // Note that unlike C we do not implement the int[ptr]
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77
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78 t1 = e1.type.toBasetype();
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79
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80 if (t1.ty == Tsarray || t1.ty == Tarray || t1.ty == Ttuple)
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81 {
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82 // Create scope for 'length' variable
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83 sym = new ArrayScopeSymbol(sc, this);
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84 sym.loc = loc;
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85 sym.parent = sc.scopesym;
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86 sc = sc.push(sym);
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87 }
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88
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89 e2 = e2.semantic(sc);
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90 if (!e2.type)
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91 {
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92 error("%s has no value", e2.toChars());
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93 e2.type = Type.terror;
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94 }
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95 e2 = resolveProperties(sc, e2);
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96
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97 if (t1.ty == Tsarray || t1.ty == Tarray || t1.ty == Ttuple)
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98 sc = sc.pop();
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99
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100 switch (t1.ty)
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101 {
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102 case Tpointer:
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103 case Tarray:
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104 e2 = e2.implicitCastTo(sc, Type.tsize_t);
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105 e.type = (cast(TypeNext)t1).next;
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106 break;
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107
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108 case Tsarray:
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109 {
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110 e2 = e2.implicitCastTo(sc, Type.tsize_t);
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111
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112 TypeSArray tsa = cast(TypeSArray)t1;
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113
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114 static if (false) {
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115 // Don't do now, because it might be short-circuit evaluated
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116 // Do compile time array bounds checking if possible
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117 e2 = e2.optimize(WANTvalue);
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118 if (e2.op == TOKint64)
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119 {
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120 ulong index = e2.toInteger();
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121 ulong length = tsa.dim.toInteger();
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122 if (index < 0 || index >= length)
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123 error("array index [%lld] is outside array bounds [0 .. %lld]", index, length);
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124 }
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125 }
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126 e.type = t1.nextOf();
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127 break;
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128 }
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129
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130 case Taarray:
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131 {
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132 TypeAArray taa = cast(TypeAArray)t1;
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133 if (!arrayTypeCompatible(e2.loc, e2.type, taa.index))
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134 {
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135 e2 = e2.implicitCastTo(sc, taa.index); // type checking
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136 }
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137 type = taa.next;
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138 break;
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139 }
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140
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141 case Ttuple:
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142 {
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143 e2 = e2.implicitCastTo(sc, Type.tsize_t);
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144 e2 = e2.optimize(WANTvalue | WANTinterpret);
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145 ulong index = e2.toUInteger();
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146 size_t length;
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147 TupleExp te;
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148 TypeTuple tup;
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149
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150 if (e1.op == TOKtuple)
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151 {
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152 te = cast(TupleExp)e1;
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153 length = te.exps.dim;
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154 }
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155 else if (e1.op == TOKtype)
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156 {
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157 tup = cast(TypeTuple)t1;
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158 length = Argument.dim(tup.arguments);
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159 }
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160 else
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161 assert(0);
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162
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163 if (index < length)
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164 {
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165 if (e1.op == TOKtuple)
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166 e = cast(Expression)te.exps.data[cast(size_t)index];
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167 else
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168 e = new TypeExp(e1.loc, Argument.getNth(tup.arguments, cast(size_t)index).type);
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169 }
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170 else
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171 {
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172 error("array index [%ju] is outside array bounds [0 .. %zu]", index, length);
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173 e = e1;
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174 }
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175 break;
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176 }
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177
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178 default:
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179 error("%s must be an array or pointer type, not %s", e1.toChars(), e1.type.toChars());
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180 type = Type.tint32;
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181 break;
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182 }
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183
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184 return e;
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185 }
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186
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72
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187 override int isLvalue()
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0
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188 {
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189 assert(false);
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190 }
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191
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72
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192 override Expression toLvalue(Scope sc, Expression e)
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0
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193 {
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194 // if (type && type.toBasetype().ty == Tvoid)
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195 // error("voids have no value");
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196 return this;
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197 }
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198
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72
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199 override Expression modifiableLvalue(Scope sc, Expression e)
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0
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200 {
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201 //printf("IndexExp::modifiableLvalue(%s)\n", toChars());
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202 modifiable = 1;
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203 if (e1.op == TOKstring)
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204 error("string literals are immutable");
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205 if (type && !type.isMutable())
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206 error("%s isn't mutable", e.toChars());
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207 if (e1.type.toBasetype().ty == Taarray)
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208 e1 = e1.modifiableLvalue(sc, e1);
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209 return toLvalue(sc, e);
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210 }
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211
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72
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212 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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0
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213 {
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214 assert(false);
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215 }
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216
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72
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217 override Expression optimize(int result)
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0
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218 {
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219 Expression e;
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220
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221 //printf("IndexExp::optimize(result = %d) %s\n", result, toChars());
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222 Expression e1 = this.e1.optimize(WANTvalue | (result & WANTinterpret));
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223 e1 = fromConstInitializer(result, e1);
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224 if (this.e1.op == TOKvar)
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225 {
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226 VarExp ve = cast(VarExp)this.e1;
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227 if (ve.var.storage_class & STCmanifest)
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228 {
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229 /* We generally don't want to have more than one copy of an
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230 * array literal, but if it's an enum we have to because the
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231 * enum isn't stored elsewhere. See Bugzilla 2559
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232 */
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233 this.e1 = e1;
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234 }
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235 }
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236
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237 e2 = e2.optimize(WANTvalue | (result & WANTinterpret));
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238 e = Index(type, e1, e2);
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239 if (e is EXP_CANT_INTERPRET)
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240 e = this;
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241
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242 return e;
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243 }
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244
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72
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245 override Expression interpret(InterState istate)
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0
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246 {
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247 assert(false);
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248 }
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249
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72
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250 override Expression doInline(InlineDoState ids)
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0
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251 {
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252 IndexExp are = cast(IndexExp)copy();
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253
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254 are.e1 = e1.doInline(ids);
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255
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256 if (lengthVar)
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257 { //printf("lengthVar\n");
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258 VarDeclaration vd = lengthVar;
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259 ExpInitializer ie;
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260 ExpInitializer ieto;
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261 VarDeclaration vto;
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262
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263 vto = new VarDeclaration(vd.loc, vd.type, vd.ident, vd.init);
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264 ///*vto = *vd;
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265 memcpy(cast(void*)vto, cast(void*)vd, VarDeclaration.classinfo.init.length);
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266 vto.parent = ids.parent;
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267 vto.csym = null;
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268 vto.isym = null;
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269
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270 ids.from.push(cast(void*)vd);
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271 ids.to.push(cast(void*)vto);
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272
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273 if (vd.init)
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274 {
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275 ie = vd.init.isExpInitializer();
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276 assert(ie);
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277 ieto = new ExpInitializer(ie.loc, ie.exp.doInline(ids));
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278 vto.init = ieto;
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279 }
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280
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281 are.lengthVar = vto;
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282 }
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283 are.e2 = e2.doInline(ids);
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284 return are;
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285 }
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286
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72
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287 override void scanForNestedRef(Scope sc)
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0
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288 {
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289 assert(false);
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290 }
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291
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72
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292 override elem* toElem(IRState* irs)
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0
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293 {
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294 elem* e;
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295 elem* n1 = e1.toElem(irs);
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296 elem* n2;
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297 elem* eb = null;
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298 Type t1;
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299
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300 //printf("IndexExp.toElem() %s\n", toChars());
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301 t1 = e1.type.toBasetype();
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302 if (t1.ty == Taarray)
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303 {
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304 // set to:
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305 // *aaGet(aa, keyti, valuesize, index);
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306
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307 TypeAArray taa = cast(TypeAArray)t1;
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308 elem* keyti;
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309 elem* ep;
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310 int vsize = cast(int)taa.next.size();
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311 elem* valuesize;
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312 Symbol* s;
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313
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314 // n2 becomes the index, also known as the key
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315 n2 = e2.toElem(irs);
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316 if (tybasic(n2.Ety) == TYstruct || tybasic(n2.Ety) == TYarray)
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317 {
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318 n2 = el_una(OPstrpar, TYstruct, n2);
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319 n2.Enumbytes = n2.E1.Enumbytes;
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320 //printf("numbytes = %d\n", n2.Enumbytes);
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321 assert(n2.Enumbytes);
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322 }
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323 valuesize = el_long(TYuint, vsize); // BUG: should be TYsize_t
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324 //printf("valuesize: "); elem_print(valuesize);
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325 if (modifiable)
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326 {
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327 n1 = el_una(OPaddr, TYnptr, n1);
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328 s = taa.aaGetSymbol("Get", 1);
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329 }
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330 else
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331 {
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332 s = taa.aaGetSymbol("GetRvalue", 1);
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333 }
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334 //printf("taa.index = %s\n", taa.index.toChars());
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335 keyti = taa.index.getInternalTypeInfo(null).toElem(irs);
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336 //keyti = taa.index.getTypeInfo(null).toElem(irs);
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337 //printf("keyti:\n");
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338 //elem_print(keyti);
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339 ep = el_params(n2, valuesize, keyti, n1, null);
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340 e = el_bin(OPcall, TYnptr, el_var(s), ep);
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341 if (global.params.useArrayBounds)
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342 {
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343 elem* n;
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344 elem* ea;
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345
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346 n = el_same(&e);
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347
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348 // Construct: ((e || ModuleAssert(line)),n)
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349 Symbol* sassert;
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350
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351 sassert = irs.blx.module_.toModuleArray();
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352 ea = el_bin(OPcall,TYvoid,el_var(sassert),
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353 el_long(TYint, loc.linnum));
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354 e = el_bin(OPoror,TYvoid,e,ea);
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355 e = el_bin(OPcomma, TYnptr, e, n);
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356 }
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357 e = el_una(OPind, type.totym(), e);
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358 if (tybasic(e.Ety) == TYstruct)
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359 e.Enumbytes = cast(uint)type.size();
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360 }
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361 else
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362 {
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363 elem* einit;
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364
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365 einit = resolveLengthVar(lengthVar, &n1, t1);
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366 n2 = e2.toElem(irs);
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367
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368 if (global.params.useArrayBounds)
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369 {
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370 elem* elength;
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371 elem* n2x;
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372 elem* ea;
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373
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374 if (t1.ty == Tsarray)
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375 {
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376 TypeSArray tsa = cast(TypeSArray)t1;
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377 ulong length = tsa.dim.toInteger();
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378
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379 elength = el_long(TYuint, length);
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380 goto L1;
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381 }
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382 else if (t1.ty == Tarray)
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383 {
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384 elength = n1;
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385 n1 = el_same(&elength);
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386 elength = el_una(OP64_32, TYuint, elength);
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387 L1:
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388 n2x = n2;
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389 n2 = el_same(&n2x);
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390 n2x = el_bin(OPlt, TYint, n2x, elength);
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391
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392 // Construct: (n2x || ModuleAssert(line))
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393 Symbol* sassert;
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394
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395 sassert = irs.blx.module_.toModuleArray();
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396 ea = el_bin(OPcall,TYvoid,el_var(sassert),
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397 el_long(TYint, loc.linnum));
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398 eb = el_bin(OPoror,TYvoid,n2x,ea);
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399 }
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400 }
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401
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402 n1 = array_toPtr(t1, n1);
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403
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404 {
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405 elem* escale;
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406
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407 escale = el_long(TYint, t1.nextOf().size());
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408 n2 = el_bin(OPmul, TYint, n2, escale);
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409 e = el_bin(OPadd, TYnptr, n1, n2);
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410 e = el_una(OPind, type.totym(), e);
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411 if (tybasic(e.Ety) == TYstruct || tybasic(e.Ety) == TYarray)
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412 {
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413 e.Ety = TYstruct;
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414 e.Enumbytes = cast(uint)type.size();
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415 }
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416 }
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417
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418 eb = el_combine(einit, eb);
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419 e = el_combine(eb, e);
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420 }
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421
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422 el_setLoc(e,loc);
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423
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424 return e;
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|
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425 }
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|
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426 }
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427
|
