Mercurial > projects > ddmd
annotate dmd/AddrExp.d @ 135:af1bebfd96a4 dmd2037
dmd 2.038
| author | Eldar Insafutdinov <e.insafutdinov@gmail.com> |
|---|---|
| date | Mon, 13 Sep 2010 22:19:42 +0100 |
| parents | e28b18c23469 |
| children | e3afd1303184 |
| rev | line source |
|---|---|
| 72 | 1 module dmd.AddrExp; |
| 2 | |
| 114 | 3 import dmd.common; |
| 72 | 4 import dmd.Expression; |
| 5 import dmd.UnaExp; | |
| 6 import dmd.MATCH; | |
| 7 import dmd.Type; | |
| 8 import dmd.Loc; | |
| 9 import dmd.Scope; | |
| 0 | 10 import dmd.IRState; |
| 11 import dmd.ErrorExp; | |
| 12 import dmd.DotVarExp; | |
| 13 import dmd.FuncDeclaration; | |
| 14 import dmd.DelegateExp; | |
| 15 import dmd.VarExp; | |
| 16 import dmd.VarDeclaration; | |
| 72 | 17 import dmd.ThisExp; |
| 0 | 18 import dmd.TOK; |
| 19 import dmd.WANT; | |
| 20 import dmd.CommaExp; | |
| 21 import dmd.STC; | |
| 22 import dmd.PtrExp; | |
| 23 import dmd.SymOffExp; | |
| 24 import dmd.IndexExp; | |
| 25 import dmd.OverExp; | |
| 26 import dmd.Dsymbol; | |
| 27 import dmd.ScopeDsymbol; | |
| 28 import dmd.TY; | |
| 72 | 29 import dmd.TypeSArray; |
| 30 | |
| 0 | 31 import dmd.backend.elem; |
| 32 import dmd.backend.Util; | |
| 72 | 33 import dmd.codegen.Util; |
| 34 | |
| 0 | 35 class AddrExp : UnaExp |
| 36 { | |
| 37 this(Loc loc, Expression e) | |
| 38 { | |
| 39 super(loc, TOK.TOKaddress, AddrExp.sizeof, e); | |
| 40 } | |
| 41 | |
| 72 | 42 override Expression semantic(Scope sc) |
| 0 | 43 { |
| 44 version (LOGSEMANTIC) { | |
| 45 printf("AddrExp.semantic('%s')\n", toChars()); | |
| 46 } | |
| 47 if (!type) | |
| 48 { | |
| 49 UnaExp.semantic(sc); | |
| 50 e1 = e1.toLvalue(sc, null); | |
| 51 if (!e1.type) | |
| 52 { | |
| 53 error("cannot take address of %s", e1.toChars()); | |
| 54 return new ErrorExp(); | |
| 55 } | |
| 56 if (!e1.type.deco) | |
| 57 { | |
| 58 /* No deco means semantic() was not run on the type. | |
| 59 * We have to run semantic() on the symbol to get the right type: | |
| 60 * auto x = &bar; | |
| 61 * pure: int bar() { return 1;} | |
| 62 * otherwise the 'pure' is missing from the type assigned to x. | |
| 63 */ | |
| 64 | |
| 65 error("forward reference to %s", e1.toChars()); | |
| 66 return new ErrorExp(); | |
| 67 } | |
| 68 | |
| 69 type = e1.type.pointerTo(); | |
| 70 | |
| 71 // See if this should really be a delegate | |
| 72 if (e1.op == TOKdotvar) | |
| 73 { | |
| 74 DotVarExp dve = cast(DotVarExp)e1; | |
| 75 FuncDeclaration f = dve.var.isFuncDeclaration(); | |
| 76 | |
| 77 if (f) | |
| 78 { | |
| 79 if (!dve.hasOverloads) | |
| 80 f.tookAddressOf++; | |
| 81 Expression e = new DelegateExp(loc, dve.e1, f, dve.hasOverloads); | |
| 82 e = e.semantic(sc); | |
| 83 return e; | |
| 84 } | |
| 85 } | |
| 86 else if (e1.op == TOKvar) | |
| 87 { | |
| 88 VarExp ve = cast(VarExp)e1; | |
| 89 | |
| 90 VarDeclaration v = ve.var.isVarDeclaration(); | |
| 91 if (v && !v.canTakeAddressOf()) | |
| 92 error("cannot take address of %s", e1.toChars()); | |
| 93 | |
| 94 FuncDeclaration f = ve.var.isFuncDeclaration(); | |
| 95 | |
| 96 if (f) | |
| 97 { | |
| 98 if (!ve.hasOverloads || | |
| 99 /* Because nested functions cannot be overloaded, | |
| 100 * mark here that we took its address because castTo() | |
| 101 * may not be called with an exact match. | |
| 102 */ | |
| 103 f.toParent2().isFuncDeclaration()) | |
| 104 f.tookAddressOf++; | |
| 105 | |
| 106 if (f.isNested()) | |
| 107 { | |
| 108 Expression e = new DelegateExp(loc, e1, f, ve.hasOverloads); | |
| 109 e = e.semantic(sc); | |
| 110 return e; | |
| 111 } | |
| 112 if (f.needThis() && hasThis(sc)) | |
| 113 { | |
| 114 /* Should probably supply 'this' after overload resolution, | |
| 115 * not before. | |
| 116 */ | |
| 117 Expression ethis = new ThisExp(loc); | |
| 118 Expression e = new DelegateExp(loc, ethis, f, ve.hasOverloads); | |
| 119 e = e.semantic(sc); | |
| 120 return e; | |
| 121 } | |
| 122 } | |
| 123 } | |
| 124 return optimize(WANTvalue); | |
| 125 } | |
| 126 return this; | |
| 127 } | |
| 128 | |
| 135 | 129 override void checkEscape() |
| 130 { | |
| 131 e1.checkEscapeRef(); | |
| 132 } | |
| 133 | |
| 72 | 134 override elem* toElem(IRState* irs) |
| 0 | 135 { |
| 136 elem* e; | |
| 137 | |
| 138 //printf("AddrExp.toElem('%s')\n", toChars()); | |
| 139 | |
| 140 e = e1.toElem(irs); | |
| 141 e = addressElem(e, e1.type); | |
| 142 L2: | |
| 143 e.Ety = type.totym(); | |
| 144 el_setLoc(e,loc); | |
| 145 return e; | |
| 146 } | |
| 147 | |
| 72 | 148 override MATCH implicitConvTo(Type t) |
| 0 | 149 { |
| 150 static if (false) { | |
| 151 printf("AddrExp.implicitConvTo(this=%s, type=%s, t=%s)\n", | |
| 152 toChars(), type.toChars(), t.toChars()); | |
| 153 } | |
| 154 MATCH result; | |
| 155 | |
| 156 result = type.implicitConvTo(t); | |
| 157 //printf("\tresult = %d\n", result); | |
| 158 | |
| 159 if (result == MATCHnomatch) | |
| 160 { | |
| 161 // Look for pointers to functions where the functions are overloaded. | |
| 162 | |
| 163 t = t.toBasetype(); | |
| 164 | |
| 165 if (e1.op == TOKoverloadset && | |
| 166 (t.ty == Tpointer || t.ty == Tdelegate) && t.nextOf().ty == Tfunction) | |
| 167 { | |
| 168 OverExp eo = cast(OverExp)e1; | |
| 169 FuncDeclaration f = null; | |
|
84
be2ab491772e
Expressions -> Vector!Expression
Eldar Insafutdinov <e.insafutdinov@gmail.com>
parents:
77
diff
changeset
|
170 foreach (s; eo.vars.a) |
| 0 | 171 { |
|
84
be2ab491772e
Expressions -> Vector!Expression
Eldar Insafutdinov <e.insafutdinov@gmail.com>
parents:
77
diff
changeset
|
172 auto f2 = s.isFuncDeclaration(); |
| 0 | 173 assert(f2); |
| 174 if (f2.overloadExactMatch(t.nextOf())) | |
| 175 { | |
| 176 if (f) | |
| 177 /* Error if match in more than one overload set, | |
| 178 * even if one is a 'better' match than the other. | |
| 179 */ | |
| 180 ScopeDsymbol.multiplyDefined(loc, f, f2); | |
| 181 else | |
| 182 f = f2; | |
| 183 result = MATCHexact; | |
| 184 } | |
| 185 } | |
| 186 } | |
| 187 | |
| 188 if (type.ty == Tpointer && type.nextOf().ty == Tfunction && | |
| 189 t.ty == Tpointer && t.nextOf().ty == Tfunction && | |
| 190 e1.op == TOKvar) | |
| 191 { | |
| 192 /* I don't think this can ever happen - | |
| 193 * it should have been | |
| 194 * converted to a SymOffExp. | |
| 195 */ | |
| 196 assert(0); | |
| 197 VarExp ve = cast(VarExp)e1; | |
| 198 FuncDeclaration f = ve.var.isFuncDeclaration(); | |
| 199 if (f && f.overloadExactMatch(t.nextOf())) | |
| 200 result = MATCHexact; | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 //printf("\tresult = %d\n", result); | |
| 205 return result; | |
| 206 } | |
| 207 | |
| 72 | 208 override Expression castTo(Scope sc, Type t) |
| 0 | 209 { |
| 210 Type tb; | |
| 211 | |
| 212 static if (false) { | |
| 213 printf("AddrExp.castTo(this=%s, type=%s, t=%s)\n", toChars(), type.toChars(), t.toChars()); | |
| 214 } | |
| 215 Expression e = this; | |
| 216 | |
| 217 tb = t.toBasetype(); | |
| 218 type = type.toBasetype(); | |
| 219 if (tb != type) | |
| 220 { | |
| 221 // Look for pointers to functions where the functions are overloaded. | |
| 222 | |
| 223 if (e1.op == TOKoverloadset && | |
| 224 (t.ty == Tpointer || t.ty == Tdelegate) && t.nextOf().ty == Tfunction) | |
| 225 { | |
| 226 OverExp eo = cast(OverExp)e1; | |
| 227 FuncDeclaration f = null; | |
|
84
be2ab491772e
Expressions -> Vector!Expression
Eldar Insafutdinov <e.insafutdinov@gmail.com>
parents:
77
diff
changeset
|
228 foreach (s; eo.vars.a) |
| 0 | 229 { |
|
84
be2ab491772e
Expressions -> Vector!Expression
Eldar Insafutdinov <e.insafutdinov@gmail.com>
parents:
77
diff
changeset
|
230 auto f2 = s.isFuncDeclaration(); |
| 0 | 231 assert(f2); |
| 232 if (f2.overloadExactMatch(t.nextOf())) | |
| 233 { | |
| 234 if (f) | |
| 235 /* Error if match in more than one overload set, | |
| 236 * even if one is a 'better' match than the other. | |
| 237 */ | |
| 238 ScopeDsymbol.multiplyDefined(loc, f, f2); | |
| 239 else | |
| 240 f = f2; | |
| 241 } | |
| 242 } | |
| 243 if (f) | |
| 244 { | |
| 245 f.tookAddressOf++; | |
| 246 SymOffExp se = new SymOffExp(loc, f, 0, 0); | |
| 247 se.semantic(sc); | |
| 248 // Let SymOffExp.castTo() do the heavy lifting | |
| 249 return se.castTo(sc, t); | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 | |
| 254 if (type.ty == Tpointer && type.nextOf().ty == Tfunction && | |
| 255 tb.ty == Tpointer && tb.nextOf().ty == Tfunction && | |
| 256 e1.op == TOKvar) | |
| 257 { | |
| 258 VarExp ve = cast(VarExp)e1; | |
| 259 FuncDeclaration f = ve.var.isFuncDeclaration(); | |
| 260 if (f) | |
| 261 { | |
| 262 assert(0); // should be SymOffExp instead | |
| 263 f = f.overloadExactMatch(tb.nextOf()); | |
| 264 if (f) | |
| 265 { | |
| 266 e = new VarExp(loc, f); | |
| 267 e.type = f.type; | |
| 268 e = new AddrExp(loc, e); | |
| 269 e.type = t; | |
| 270 return e; | |
| 271 } | |
| 272 } | |
| 273 } | |
| 274 e = Expression.castTo(sc, t); | |
| 275 } | |
| 276 e.type = t; | |
| 277 return e; | |
| 278 } | |
| 279 | |
| 72 | 280 override Expression optimize(int result) |
| 0 | 281 { |
| 282 Expression e; | |
| 283 | |
| 284 //printf("AddrExp.optimize(result = %d) %s\n", result, toChars()); | |
| 285 | |
| 286 /* Rewrite &(a,b) as (a,&b) | |
| 287 */ | |
| 288 if (e1.op == TOKcomma) | |
| 289 { | |
| 290 CommaExp ce = cast(CommaExp)e1; | |
| 291 AddrExp ae = new AddrExp(loc, ce.e2); | |
| 292 ae.type = type; | |
| 293 e = new CommaExp(ce.loc, ce.e1, ae); | |
| 294 e.type = type; | |
| 295 return e.optimize(result); | |
| 296 } | |
| 297 | |
| 298 if (e1.op == TOKvar) | |
| 299 { | |
| 300 VarExp ve = cast(VarExp)e1; | |
| 301 if (ve.var.storage_class & STCmanifest) | |
| 302 e1 = e1.optimize(result); | |
| 303 } | |
| 304 else | |
| 305 e1 = e1.optimize(result); | |
| 306 | |
| 307 // Convert &*ex to ex | |
| 308 if (e1.op == TOKstar) | |
| 309 { | |
| 310 Expression ex; | |
| 311 | |
| 312 ex = (cast(PtrExp)e1).e1; | |
| 313 if (type.equals(ex.type)) | |
| 314 e = ex; | |
| 315 else | |
| 316 { | |
| 317 e = ex.copy(); | |
| 318 e.type = type; | |
| 319 } | |
| 320 return e; | |
| 321 } | |
| 322 if (e1.op == TOKvar) | |
| 323 { | |
| 324 VarExp ve = cast(VarExp)e1; | |
| 325 if (!ve.var.isOut() && !ve.var.isRef() && | |
| 326 !ve.var.isImportedSymbol()) | |
| 327 { | |
| 328 SymOffExp se = new SymOffExp(loc, ve.var, 0, ve.hasOverloads); | |
| 329 se.type = type; | |
| 330 return se; | |
| 331 } | |
| 332 } | |
| 333 if (e1.op == TOKindex) | |
| 334 { | |
| 335 // Convert &array[n] to &array+n | |
| 336 IndexExp ae = cast(IndexExp)e1; | |
| 337 | |
| 338 if (ae.e2.op == TOKint64 && ae.e1.op == TOKvar) | |
| 339 { | |
| 340 long index = ae.e2.toInteger(); | |
| 341 VarExp ve = cast(VarExp)ae.e1; | |
| 342 if (ve.type.ty == Tsarray | |
| 343 && !ve.var.isImportedSymbol()) | |
| 344 { | |
| 345 TypeSArray ts = cast(TypeSArray)ve.type; | |
| 346 long dim = ts.dim.toInteger(); | |
| 347 if (index < 0 || index >= dim) | |
| 348 error("array index %jd is out of bounds [0..%jd]", index, dim); | |
| 349 e = new SymOffExp(loc, ve.var, cast(uint)(index * ts.nextOf().size())); | |
| 350 e.type = type; | |
| 351 return e; | |
| 352 } | |
| 353 } | |
| 354 } | |
| 355 return this; | |
| 356 } | |
| 357 } | |
| 358 |