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