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annotate sema/DType.d @ 83:9e90694f5da0 new_gen

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Parse array indexing, and allow reading from arrays
author Anders Halager <halager@gmail.com>
date Fri, 02 May 2008 19:54:22 +0200
parents 110c7e1c4ca2
children eb5b2c719a39
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1 module sema.DType;
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2
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3 import lexer.Token,
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4 ast.Exp;
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6 import tango.io.Stdout;
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7
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8 class DType
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9 {
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10 private char[] id;
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11 private Location loc;
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12 public DType actual;
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14 this(Identifier id, DType actual = null)
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15 {
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16 Token temp = id.token;
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17 this.id = temp.get;
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18 this.loc = temp.location;
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19 this.actual = actual is null? this : actual;
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20 }
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21
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22 this(char[] id, DType actual = null)
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23 {
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24 this.id = id;
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25 this.actual = actual is null? this : actual;
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26 }
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28 /// Is this type a DStruct
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29 bool isStruct() { return false; }
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30 /// Return a DStruct if this is one, otherwise return null
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31 DStruct asStruct() { return null; }
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32
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33 /// Is this type a DArray
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34 bool isArray() { return false; }
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35 /// Return a DArray if this is one, otherwise return null
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36 DArray asArray() { return null; }
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38 /// Is this type a DPointer
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39 bool isPointer() { return false; }
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40 /// Return a DPointer if this is one, otherwise return null
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41 DPointer asPointer() { return null; }
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43 /// Is this type a DFunction
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44 bool isFunction() { return false; }
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45 /// Return a DFunction if this is one, otherwise return null
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46 DFunction asFunction() { return null; }
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48 /// Is this type a DInteger
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49 bool isInteger() { return false; }
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50 /// Return a DInteger if this is one, otherwise return null
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51 DInteger asInteger() { return null; }
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52
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53 int opEquals(Object o)
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54 {
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55 if (auto t = cast(DType)o)
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56 return this.actual is t.actual;
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57 return 0;
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58 }
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60 int opCmp(Object o)
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61 {
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62 if (auto t = cast(DType)o)
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63 return cast(void*)this.actual - cast(void*)t.actual;
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64 return 0;
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65 }
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67 /**
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68 Hashing is done by casting the reference to a void* and taking that
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69 value, but this gives a bad distribution of hash-values.
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71 Multiple DType's allocated close to each other will only have a
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72 difference in the lower bits of their hashes.
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73 */
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74 hash_t toHash()
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75 {
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76 return cast(hash_t)(cast(void*)this);
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77 }
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79 char[] name() { return id; }
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80 Location getLoc() { return loc; }
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81 int byteSize() { return 0; }
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83 /**
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84 Can this type legally be converted to that type with no casts?
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85 True for short -> int etc.
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86 */
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87 bool hasImplicitConversionTo(DType that) { return false; }
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88
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89 /**
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90 Get a type representing a pointer to this type (from int to int*)
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91 */
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92 DPointer getPointerTo()
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93 {
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94 if(myPointer !is null)
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95 return myPointer;
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96 myPointer = new DPointer(this);
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97 return myPointer;
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98 }
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99 private DPointer myPointer;
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100
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101 /**
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102 Get a type representing a static array of this type with length 'size'
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103 */
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104 DArray getAsArray(int size)
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105 {
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106 if(size in myArray)
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107 return myArray[size];
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108 myArray[size] = new DArray(this, size);
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109 return myArray[size];
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110 }
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111 private DArray[int] myArray;
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112
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113 static DInteger
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114 Bool,
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115 Byte, UByte, Short, UShort,
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116 Int, UInt, Long, ULong;
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117
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118 static DType Void;
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119
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120 static this()
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121 {
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122 Void = new DType("void");
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123
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124 Bool = new DInteger("bool", 1, false);
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125 Byte = new DInteger("byte", 8, false);
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126 UByte = new DInteger("ubyte", 8, true);
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127 Short = new DInteger("short", 16, false);
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128 UShort = new DInteger("ushort", 16, true);
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129 Int = new DInteger("int", 32, false);
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130 UInt = new DInteger("uint", 32, true);
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131 Long = new DInteger("long", 64, false);
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132 ULong = new DInteger("ulong", 64, true);
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133 }
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134 }
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135
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136 /**
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137 Class to represent the built-in integer types, from byte to long.
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138 */
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139 class DInteger : DType
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140 {
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141 this(char[] name, int bits, bool unsigned)
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142 {
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143 super(name, null);
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144 this.bits = bits;
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145 this.unsigned = unsigned;
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146 }
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147
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148 override int byteSize() { return bits / 8; }
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149
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150 override bool hasImplicitConversionTo(DType that)
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151 {
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152 if (auto o = cast(DInteger)that)
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153 return true;
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154 // return this.bits >= o.bits;
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155 return false;
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156 }
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157
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158 override bool isInteger() { return true; }
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159 override DInteger asInteger() { return this; }
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160
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161 int bits;
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162 bool unsigned;
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163 }
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164
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165 class DStruct : DType
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166 {
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167 this(Identifier id, DType actual = null)
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168 {
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169 super(id, actual);
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170 }
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171
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172 int byteSize() { return bytes_total; }
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173
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174 override bool isStruct() { return true; }
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175 override DStruct asStruct() { return this; }
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176
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177 void addMember(DType type, char[] name)
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178 {
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179 auto s = DStructMember(type, members.length);
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180 members[name] = s;
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181
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182 bytes_total += type.byteSize();
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183 }
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184
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185 int indexOf(char[] name)
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186 {
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187 if(name in members)
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188 return members[name].index;
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189
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190 return -1;
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191 }
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192
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193 DType typeOf(char[] name)
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194 {
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195 if (auto res = name in members)
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196 return res.type;
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197 return null;
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198 }
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199
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200 DStructMember[char[]] members;
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201 private int bytes_total;
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202
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203 struct DStructMember
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204 {
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205 DType type;
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206 int index;
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207 }
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208 }
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209
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210 class DArray : DType
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211 {
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212 this(DType arrayOf, int size, DType actual = null)
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213 {
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214 super(id, actual);
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215 this.arrayOf = arrayOf;
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216 this.size = size;
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217 }
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218
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219 override bool isArray() { return true; }
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220 override DArray asArray() { return this; }
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221
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222 int byteSize() { return arrayOf.byteSize * size; }
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223
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224 DType arrayOf;
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225 const int size;
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226 }
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227
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228 class DPointer : DType
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229 {
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230 this(DType pointerOf, DType actual = null)
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231 {
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232 super(id, actual);
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233 this.pointerOf = pointerOf;
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234 }
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235
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236 override bool isPointer() { return true; }
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237 override DPointer asPointer() { return this; }
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238
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239 int byteSize() { return DType.Int.byteSize; }
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240
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241 DType pointerOf;
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242 }
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243
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244 class DFunction : DType
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245 {
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246 this(Identifier id, DType actual = null)
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247 {
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248 super(id, actual);
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249 }
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250
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251 override bool isFunction() { return true; }
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252 override DFunction asFunction() { return this; }
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253
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254 DType[] params;
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255 DType returnType;
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256 bool firstParamIsReturnValue = false;
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257 }
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258