Mercurial > projects > ddmd
annotate dmd/SymOffExp.d @ 179:cd48cb899aee
Updated to dmd2.040
| author | korDen |
|---|---|
| date | Sun, 17 Oct 2010 20:56:07 +0400 |
| parents | e3afd1303184 |
| children | b0d41ff5e0df |
| rev | line source |
|---|---|
| 72 | 1 module dmd.SymOffExp; |
| 2 | |
| 114 | 3 import dmd.common; |
| 72 | 4 import dmd.Expression; |
| 179 | 5 import dmd.GlobalExpressions; |
| 72 | 6 import dmd.Declaration; |
| 7 import dmd.MATCH; | |
| 8 import dmd.Type; | |
| 179 | 9 import dmd.InterState; |
| 72 | 10 import dmd.OutBuffer; |
| 11 import dmd.Loc; | |
| 12 import dmd.Scope; | |
| 13 import dmd.InlineDoState; | |
| 14 import dmd.HdrGenState; | |
| 15 import dmd.backend.dt_t; | |
| 0 | 16 import dmd.SymbolExp; |
| 17 import dmd.VarDeclaration; | |
| 18 import dmd.DelegateExp; | |
| 19 import dmd.ThisExp; | |
| 20 import dmd.FuncDeclaration; | |
| 21 import dmd.IntegerExp; | |
| 22 import dmd.ErrorExp; | |
| 72 | 23 import dmd.TY; |
| 0 | 24 import dmd.TOK; |
| 135 | 25 import dmd.STC; |
| 0 | 26 |
| 27 import dmd.backend.Symbol; | |
| 28 import dmd.backend.Util; | |
| 29 import dmd.backend.TYM; | |
| 72 | 30 |
| 0 | 31 class SymOffExp : SymbolExp |
| 32 { | |
| 33 uint offset; | |
| 34 | |
| 73 | 35 this(Loc loc, Declaration var, uint offset, bool hasOverloads = false) |
| 0 | 36 { |
| 178 | 37 register(); |
| 0 | 38 super(loc, TOK.TOKsymoff, SymOffExp.sizeof, var, hasOverloads); |
| 39 | |
| 40 this.offset = offset; | |
| 41 VarDeclaration v = var.isVarDeclaration(); | |
| 42 if (v && v.needThis()) | |
| 43 error("need 'this' for address of %s", v.toChars()); | |
| 44 } | |
| 45 | |
| 72 | 46 override Expression semantic(Scope sc) |
| 0 | 47 { |
| 48 version(LOGSEMANTIC) { | |
| 49 printf("SymOffExp::semantic('%s')\n", toChars()); | |
| 50 } | |
| 51 //var.semantic(sc); | |
| 52 if (!type) | |
| 53 type = var.type.pointerTo(); | |
| 54 VarDeclaration v = var.isVarDeclaration(); | |
| 55 if (v) | |
| 56 v.checkNestedReference(sc, loc); | |
| 57 return this; | |
| 58 } | |
| 179 | 59 |
| 60 Expression interpret(InterState istate) | |
| 61 { | |
| 62 version (LOG) { | |
| 63 writef("SymOffExp::interpret() %s\n", toChars()); | |
| 64 } | |
| 65 if (var.isFuncDeclaration() && offset == 0) | |
| 66 { | |
| 67 return this; | |
| 68 } | |
| 69 error("Cannot interpret %s at compile time", toChars()); | |
| 70 return EXP_CANT_INTERPRET; | |
| 71 | |
| 72 } | |
| 0 | 73 |
| 72 | 74 override void checkEscape() |
| 0 | 75 { |
| 76 VarDeclaration v = var.isVarDeclaration(); | |
| 77 if (v) | |
| 78 { | |
| 135 | 79 if (!v.isDataseg() && !(v.storage_class & (STC.STCref | STC.STCout))) |
|
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80 { /* BUG: This should be allowed: |
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81 * void foo() |
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82 * { int a; |
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83 * int* bar() { return &a; } |
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84 * } |
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85 */ |
| 135 | 86 error("escaping reference to local %s", v.toChars()); |
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87 } |
| 0 | 88 } |
| 89 } | |
| 90 | |
| 72 | 91 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 92 { |
| 174 | 93 if (offset) |
| 94 buf.printf("(& %s+%s)", var.toChars(), offset); /// | |
| 95 else | |
| 96 buf.printf("& %s", var.toChars()); | |
| 0 | 97 } |
| 98 | |
| 72 | 99 override int isConst() |
| 0 | 100 { |
| 101 return 2; | |
| 102 } | |
| 103 | |
| 72 | 104 override bool isBool(bool result) |
| 0 | 105 { |
| 129 | 106 return result; |
| 0 | 107 } |
| 108 | |
| 72 | 109 override Expression doInline(InlineDoState ids) |
| 0 | 110 { |
| 111 int i; | |
| 112 | |
| 113 //printf("SymOffExp.doInline(%s)\n", toChars()); | |
| 114 for (i = 0; i < ids.from.dim; i++) | |
| 115 { | |
| 116 if (var is cast(Declaration)ids.from.data[i]) | |
| 117 { | |
| 118 SymOffExp se = cast(SymOffExp)copy(); | |
| 119 | |
| 120 se.var = cast(Declaration)ids.to.data[i]; | |
| 121 return se; | |
| 122 } | |
| 123 } | |
| 124 return this; | |
| 125 } | |
| 126 | |
| 72 | 127 override MATCH implicitConvTo(Type t) |
| 0 | 128 { |
| 129 static if (false) { | |
| 130 printf("SymOffExp::implicitConvTo(this=%s, type=%s, t=%s)\n", toChars(), type.toChars(), t.toChars()); | |
| 131 } | |
| 132 MATCH result = type.implicitConvTo(t); | |
| 133 //printf("\tresult = %d\n", result); | |
| 134 | |
| 135 if (result == MATCHnomatch) | |
| 136 { | |
| 137 // Look for pointers to functions where the functions are overloaded. | |
| 138 FuncDeclaration f; | |
| 139 | |
| 140 t = t.toBasetype(); | |
| 141 if (type.ty == Tpointer && type.nextOf().ty == Tfunction && | |
| 142 (t.ty == Tpointer || t.ty == Tdelegate) && t.nextOf().ty == Tfunction) | |
| 143 { | |
| 144 f = var.isFuncDeclaration(); | |
| 145 if (f) | |
| 146 { | |
| 147 f = f.overloadExactMatch(t.nextOf()); | |
| 148 if (f) | |
| 149 { | |
| 150 if ((t.ty == Tdelegate && (f.needThis() || f.isNested())) || | |
| 151 (t.ty == Tpointer && !(f.needThis() || f.isNested()))) | |
| 152 { | |
| 153 result = MATCHexact; | |
| 154 } | |
| 155 } | |
| 156 } | |
| 157 } | |
| 158 } | |
| 159 //printf("\tresult = %d\n", result); | |
| 160 return result; | |
| 161 } | |
| 162 | |
| 72 | 163 override Expression castTo(Scope sc, Type t) |
| 0 | 164 { |
| 165 static if (false) { | |
| 166 printf("SymOffExp::castTo(this=%s, type=%s, t=%s)\n", toChars(), type.toChars(), t.toChars()); | |
| 167 } | |
| 73 | 168 if (type == t && !hasOverloads) |
| 0 | 169 return this; |
| 170 | |
| 171 Expression e; | |
| 172 Type tb = t.toBasetype(); | |
| 173 Type typeb = type.toBasetype(); | |
| 174 | |
| 175 if (tb != typeb) | |
| 176 { | |
| 177 // Look for pointers to functions where the functions are overloaded. | |
| 178 FuncDeclaration f; | |
| 179 | |
| 180 if (hasOverloads && | |
| 181 typeb.ty == Tpointer && typeb.nextOf().ty == Tfunction && | |
| 182 (tb.ty == Tpointer || tb.ty == Tdelegate) && tb.nextOf().ty == Tfunction) | |
| 183 { | |
| 184 f = var.isFuncDeclaration(); | |
| 185 if (f) | |
| 186 { | |
| 187 f = f.overloadExactMatch(tb.nextOf()); | |
| 188 if (f) | |
| 189 { | |
| 190 if (tb.ty == Tdelegate) | |
| 191 { | |
| 192 if (f.needThis() && hasThis(sc)) | |
| 193 { | |
| 194 e = new DelegateExp(loc, new ThisExp(loc), f); | |
| 195 e = e.semantic(sc); | |
| 196 } | |
| 197 else if (f.isNested()) | |
| 198 { | |
| 199 e = new DelegateExp(loc, new IntegerExp(0), f); | |
| 200 e = e.semantic(sc); | |
| 201 } | |
| 202 else if (f.needThis()) | |
| 203 { | |
| 204 error("no 'this' to create delegate for %s", f.toChars()); | |
| 205 e = new ErrorExp(); | |
| 206 } | |
| 207 else | |
| 208 { | |
| 209 error("cannot cast from function pointer to delegate"); | |
| 210 e = new ErrorExp(); | |
| 211 } | |
| 212 } | |
| 213 else | |
| 214 { | |
| 215 e = new SymOffExp(loc, f, 0); | |
| 216 e.type = t; | |
| 217 } | |
| 218 version (DMDV2) { | |
| 219 f.tookAddressOf++; | |
| 220 } | |
| 221 return e; | |
| 222 } | |
| 223 } | |
| 224 } | |
| 225 e = Expression.castTo(sc, t); | |
| 226 } | |
| 227 else | |
| 228 { | |
| 229 e = copy(); | |
| 230 e.type = t; | |
| 73 | 231 (cast(SymOffExp)e).hasOverloads = false; |
| 0 | 232 } |
| 233 return e; | |
| 234 } | |
| 235 | |
| 72 | 236 override void scanForNestedRef(Scope sc) |
| 0 | 237 { |
| 72 | 238 //printf("SymOffExp.scanForNestedRef(%s)\n", toChars()); |
| 239 VarDeclaration v = var.isVarDeclaration(); | |
| 240 if (v) | |
| 64 | 241 v.checkNestedReference(sc, Loc(0)); |
| 0 | 242 } |
| 243 | |
| 72 | 244 override dt_t** toDt(dt_t** pdt) |
| 0 | 245 { |
| 246 //printf("SymOffExp.toDt('%s')\n", var.toChars()); | |
| 247 assert(var); | |
| 248 if (!(var.isDataseg() || var.isCodeseg()) || | |
| 249 var.needThis() || | |
| 250 var.isThreadlocal() | |
| 251 ) | |
| 252 { | |
| 253 debug writef("SymOffExp.toDt()\n"); | |
| 254 error("non-constant expression %s", toChars()); | |
| 255 return pdt; | |
| 256 } | |
| 257 | |
| 258 Symbol* s = var.toSymbol(); | |
| 259 return dtxoff(pdt, s, offset, TYnptr); | |
| 260 } | |
|
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261 |
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262 static if (false) |
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263 { |
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264 override elem* toElem(IRState* irs) |
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265 { |
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266 assert(false); // this function is #if 0'ed out in dmd |
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267 } |
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268 } |
| 0 | 269 } |
| 270 |