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72
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1 module dmd.ThisExp;
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2
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114
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3 import dmd.common;
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72
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4 import dmd.Expression;
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0
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5 import dmd.Declaration;
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6 import dmd.StructDeclaration;
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7 import dmd.ClassDeclaration;
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8 import dmd.Dsymbol;
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72
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9 import dmd.FuncDeclaration;
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0
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10 import dmd.backend.elem;
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72
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11 import dmd.CSX;
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12 import dmd.InterState;
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13 import dmd.OutBuffer;
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14 import dmd.Loc;
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0
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15 import dmd.Scope;
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72
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16 import dmd.Type;
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17 import dmd.TOK;
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18 import dmd.InlineCostState;
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19 import dmd.InlineDoState;
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20 import dmd.IRState;
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0
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21 import dmd.HdrGenState;
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22 import dmd.VarExp;
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23 import dmd.TY;
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24
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25 import dmd.codegen.Util;
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26 import dmd.backend.TYM;
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27 import dmd.backend.Util;
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28 import dmd.backend.OPER;
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72
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29
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0
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30 class ThisExp : Expression
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31 {
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32 Declaration var;
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33
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34 this(Loc loc)
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35 {
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36 super(loc, TOK.TOKthis, ThisExp.sizeof);
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37 //printf("ThisExp::ThisExp() loc = %d\n", loc.linnum);
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38 }
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39
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72
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40 override Expression semantic(Scope sc)
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0
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41 {
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42 FuncDeclaration fd;
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43 FuncDeclaration fdthis;
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44
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45 version (LOGSEMANTIC) {
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46 printf("ThisExp::semantic()\n");
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47 }
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48 if (type)
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49 {
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50 //assert(global.errors || var);
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51 return this;
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52 }
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53
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54 /* Special case for typeof(this) and typeof(super) since both
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55 * should work even if they are not inside a non-static member function
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56 */
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57 if (sc.intypeof)
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58 {
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59 // Find enclosing struct or class
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60 for (Dsymbol s = sc.parent; 1; s = s.parent)
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61 {
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62 if (!s)
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63 {
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64 error("%s is not in a class or struct scope", toChars());
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65 goto Lerr;
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66 }
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67 ClassDeclaration cd = s.isClassDeclaration();
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68 if (cd)
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69 {
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70 type = cd.type;
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71 return this;
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72 }
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73 StructDeclaration sd = s.isStructDeclaration();
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74 if (sd)
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75 {
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76 version (STRUCTTHISREF) {
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77 type = sd.type;
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78 } else {
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79 type = sd.type.pointerTo();
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80 }
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81 return this;
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82 }
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83 }
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84 }
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85
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86 fdthis = sc.parent.isFuncDeclaration();
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87 fd = hasThis(sc); // fd is the uplevel function with the 'this' variable
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88 if (!fd)
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89 goto Lerr;
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90
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91 assert(fd.vthis);
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92 var = fd.vthis;
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93 assert(var.parent);
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94 type = var.type;
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95 var.isVarDeclaration().checkNestedReference(sc, loc);
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96 if (!sc.intypeof)
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97 sc.callSuper |= CSXthis;
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98 return this;
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99
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100 Lerr:
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101 error("'this' is only defined in non-static member functions, not %s", sc.parent.toChars());
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102 type = Type.terror;
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103 return this;
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104 }
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105
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72
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106 override Expression interpret(InterState istate)
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0
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107 {
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108 assert(false);
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109 }
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110
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72
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111 override bool isBool(bool result)
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0
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112 {
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113 return result ? true : false;
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114 }
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115
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72
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116 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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0
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117 {
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118 buf.writestring("this");
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119 }
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120
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121 version (DMDV2) {
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72
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122 override int isLvalue()
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0
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123 {
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124 return 1;
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125 }
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126 }
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72
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127 override Expression toLvalue(Scope sc, Expression e)
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0
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128 {
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129 return this;
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130 }
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131
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72
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132 override void scanForNestedRef(Scope sc)
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0
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133 {
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134 assert(false);
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135 }
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136
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72
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137 override int inlineCost(InlineCostState* ics)
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0
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138 {
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139 FuncDeclaration fd = ics.fd;
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140 if (!ics.hdrscan)
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141 if (fd.isNested() || !ics.hasthis)
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142 return COST_MAX;
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143
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144 return 1;
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145 }
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146
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72
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147 override Expression doInline(InlineDoState ids)
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0
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148 {
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149 //if (!ids.vthis)
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150 //error("no 'this' when inlining %s", ids.parent.toChars());
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151 if (!ids.vthis)
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152 {
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153 return this;
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154 }
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155
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156 VarExp ve = new VarExp(loc, ids.vthis);
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157 ve.type = type;
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158 return ve;
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159 }
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160
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72
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161 override elem* toElem(IRState* irs)
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0
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162 {
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163 elem* ethis;
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164 FuncDeclaration fd;
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165
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166 //printf("ThisExp::toElem()\n");
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167 assert(irs.sthis);
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168
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169 if (var)
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170 {
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171 assert(var.parent);
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172 fd = var.toParent2().isFuncDeclaration();
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173 assert(fd);
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174 ethis = getEthis(loc, irs, fd);
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175 }
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176 else
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177 ethis = el_var(irs.sthis);
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178
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179 version (STRUCTTHISREF) {
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180 if (type.ty == Tstruct)
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181 {
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182 ethis = el_una(OPind, TYstruct, ethis);
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183 ethis.Enumbytes = cast(uint)type.size();
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184 }
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185 }
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186 el_setLoc(ethis,loc);
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187 return ethis;
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188 }
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189 }
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190
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