Mercurial > projects > ddmd
annotate dmd/Expression.d @ 135:af1bebfd96a4 dmd2037
dmd 2.038
| author | Eldar Insafutdinov <e.insafutdinov@gmail.com> |
|---|---|
| date | Mon, 13 Sep 2010 22:19:42 +0100 |
| parents | 60bb0fe4563e |
| children | 7171e6ea651d |
| rev | line source |
|---|---|
| 0 | 1 module dmd.Expression; |
| 2 | |
| 114 | 3 import dmd.common; |
| 0 | 4 import dmd.Loc; |
| 5 import dmd.TOK; | |
|
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6 import dmd.Parameter; |
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7 import dmd.IdentifierExp; |
| 0 | 8 import dmd.Type; |
| 9 import dmd.WANT; | |
| 10 import dmd.Scope; | |
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11 import dmd.Array; |
| 0 | 12 import dmd.ArrayTypes; |
| 13 import dmd.OutBuffer; | |
| 14 import dmd.HdrGenState; | |
| 15 import dmd.MATCH; | |
| 16 import dmd.IntRange; | |
| 17 import dmd.Dsymbol; | |
| 18 import dmd.FuncDeclaration; | |
| 19 import dmd.InterState; | |
| 20 import dmd.InlineCostState; | |
| 21 import dmd.InlineDoState; | |
| 22 import dmd.InlineScanState; | |
| 23 import dmd.Identifier; | |
| 24 import dmd.IRState; | |
| 25 import dmd.DotIdExp; | |
| 26 import dmd.TypeExp; | |
| 27 import dmd.DYNCAST; | |
| 28 import dmd.TY; | |
| 29 import dmd.CallExp; | |
| 30 import dmd.VarExp; | |
| 31 import dmd.STC; | |
| 32 import dmd.TemplateInstance; | |
| 33 import dmd.CommaExp; | |
| 34 import dmd.NullExp; | |
| 35 import dmd.AddrExp; | |
| 55 | 36 import dmd.LINK; |
| 37 import dmd.FuncExp; | |
| 38 import dmd.ReturnStatement; | |
| 39 import dmd.Statement; | |
| 40 import dmd.FuncLiteralDeclaration; | |
| 41 import dmd.TypeFunction; | |
| 0 | 42 import dmd.ErrorExp; |
| 43 import dmd.TypeStruct; | |
| 44 import dmd.CastExp; | |
| 45 import dmd.Global; | |
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46 import dmd.GlobalExpressions; |
| 0 | 47 import dmd.Token; |
| 48 import dmd.TypeClass; | |
| 49 import dmd.PtrExp; | |
| 50 import dmd.TypeSArray; | |
| 51 import dmd.TypeReference; | |
| 52 import dmd.Util; | |
| 53 import dmd.Complex; | |
| 54 | |
| 55 import dmd.backend.elem; | |
| 56 import dmd.backend.dt_t; | |
| 57 | |
| 4 | 58 import core.memory; |
| 2 | 59 |
| 0 | 60 import std.stdio : writef; |
| 61 | |
| 62 import std.conv; | |
| 63 | |
| 64 /* Things like: | |
| 65 * int.size | |
| 66 * foo.size | |
| 67 * (foo).size | |
| 68 * cast(foo).size | |
| 69 */ | |
| 70 | |
| 71 Expression typeDotIdExp(Loc loc, Type type, Identifier ident) | |
| 72 { | |
| 73 return new DotIdExp(loc, new TypeExp(loc, type), ident); | |
| 74 } | |
| 75 | |
| 76 /***************************************** | |
| 77 * Determine if 'this' is available. | |
| 78 * If it is, return the FuncDeclaration that has it. | |
| 79 */ | |
| 80 | |
| 81 FuncDeclaration hasThis(Scope sc) | |
| 82 { | |
| 83 FuncDeclaration fd; | |
| 84 FuncDeclaration fdthis; | |
| 85 | |
| 86 //printf("hasThis()\n"); | |
| 87 fdthis = sc.parent.isFuncDeclaration(); | |
| 88 //printf("fdthis = %p, '%s'\n", fdthis, fdthis ? fdthis.toChars() : ""); | |
| 89 | |
| 90 // Go upwards until we find the enclosing member function | |
| 91 fd = fdthis; | |
| 92 while (1) | |
| 93 { | |
| 94 if (!fd) | |
| 95 { | |
| 96 goto Lno; | |
| 97 } | |
| 98 if (!fd.isNested()) | |
| 99 break; | |
| 100 | |
| 101 Dsymbol parent = fd.parent; | |
| 102 while (parent) | |
| 103 { | |
| 104 TemplateInstance ti = parent.isTemplateInstance(); | |
| 105 if (ti) | |
| 106 parent = ti.parent; | |
| 107 else | |
| 108 break; | |
| 109 } | |
| 110 | |
| 111 fd = fd.parent.isFuncDeclaration(); | |
| 112 } | |
| 113 | |
| 114 if (!fd.isThis()) | |
| 115 { | |
| 116 //printf("test '%s'\n", fd.toChars()); | |
| 117 goto Lno; | |
| 118 } | |
| 119 | |
| 120 assert(fd.vthis); | |
| 121 return fd; | |
| 122 | |
| 123 Lno: | |
| 124 return null; // don't have 'this' available | |
| 125 } | |
| 126 | |
| 127 /*************************************** | |
| 128 * Pull out any properties. | |
| 129 */ | |
| 130 Expression resolveProperties(Scope sc, Expression e) | |
| 131 { | |
| 132 //printf("resolveProperties(%s)\n", e.toChars()); | |
| 133 if (e.type) | |
| 134 { | |
| 135 Type t = e.type.toBasetype(); | |
| 136 | |
| 137 if (t.ty == TY.Tfunction || e.op == TOK.TOKoverloadset) | |
| 138 { | |
| 109 | 139 static if(false) |
| 140 { | |
| 141 if (t.ty == Tfunction && !(cast(TypeFunction)t).isproperty) | |
| 142 error(e.loc, "not a property %s\n", e.toChars()); | |
| 143 } | |
| 0 | 144 e = new CallExp(e.loc, e); |
| 145 e = e.semantic(sc); | |
| 146 } | |
| 147 | |
| 148 /* Look for e being a lazy parameter; rewrite as delegate call | |
| 149 */ | |
| 150 else if (e.op == TOK.TOKvar) | |
| 151 { VarExp ve = cast(VarExp)e; | |
| 152 | |
| 153 if (ve.var.storage_class & STC.STClazy) | |
| 154 { | |
| 155 e = new CallExp(e.loc, e); | |
| 156 e = e.semantic(sc); | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 else if (e.op == TOK.TOKdotexp) | |
| 161 { | |
| 162 e.error("expression has no value"); | |
| 163 } | |
| 164 } | |
| 165 else if (e.op == TOK.TOKdottd) | |
| 166 { | |
| 167 e = new CallExp(e.loc, e); | |
| 168 e = e.semantic(sc); | |
| 169 } | |
| 170 | |
| 171 return e; | |
| 172 } | |
| 173 | |
| 95 | 174 void indent(int indent) |
| 175 { | |
| 176 foreach (i; 0 .. indent) | |
| 177 writef(" "); | |
| 178 } | |
| 179 | |
| 180 string type_print(Type type) | |
| 181 { | |
| 182 return type ? type.toChars() : "null"; | |
| 183 } | |
| 184 | |
| 0 | 185 class Expression |
| 186 { | |
| 187 Loc loc; // file location | |
| 188 TOK op; // handy to minimize use of dynamic_cast | |
| 189 Type type; // !=null means that semantic() has been run | |
| 190 int size; // # of bytes in Expression so we can copy() it | |
| 191 | |
| 192 this(Loc loc, TOK op, int size) | |
| 193 { | |
| 194 this.loc = loc; | |
| 195 //writef("Expression.Expression(op = %d %s) this = %p\n", op, to!(string)(op), this); | |
| 196 this.op = op; | |
| 197 this.size = size; | |
| 198 type = null; | |
| 199 } | |
| 200 | |
| 45 | 201 bool equals(Object o) |
| 0 | 202 { |
| 203 return this is o; | |
| 204 } | |
| 205 | |
| 206 /********************************* | |
| 207 * Does *not* do a deep copy. | |
| 208 */ | |
| 209 Expression copy() /// bad bad bad | |
| 210 { | |
| 211 Expression e; | |
| 212 if (!size) | |
| 213 { | |
| 214 debug { | |
| 215 writef("No expression copy for: %s\n", toChars()); | |
| 216 writef("op = %d\n", op); | |
| 217 dump(0); | |
| 218 } | |
| 219 assert(0); | |
| 220 } | |
| 221 auto size = this.classinfo.init.length; | |
| 2 | 222 auto ptr = GC.malloc(size); |
| 0 | 223 memcpy(ptr, cast(void*)this, size); |
| 224 | |
| 225 return cast(Expression)ptr; | |
| 226 } | |
| 227 | |
| 228 Expression syntaxCopy() | |
| 229 { | |
| 230 //printf("Expression::syntaxCopy()\n"); | |
| 231 //dump(0); | |
| 232 return copy(); | |
| 233 } | |
| 234 | |
| 235 Expression semantic(Scope sc) | |
| 236 { | |
| 237 version (LOGSEMANTIC) { | |
| 238 printf("Expression.semantic() %s\n", toChars()); | |
| 239 } | |
| 240 if (type) | |
| 241 type = type.semantic(loc, sc); | |
| 242 else | |
| 243 type = Type.tvoid; | |
| 244 return this; | |
| 245 } | |
| 246 | |
| 247 Expression trySemantic(Scope sc) | |
| 248 { | |
| 249 uint errors = global.errors; | |
| 250 global.gag++; | |
| 251 Expression e = semantic(sc); | |
| 252 global.gag--; | |
| 253 if (errors != global.errors) | |
| 254 { | |
| 255 global.errors = errors; | |
| 256 e = null; | |
| 257 } | |
| 258 return e; | |
| 259 } | |
| 260 | |
| 261 DYNCAST dyncast() { return DYNCAST.DYNCAST_EXPRESSION; } // kludge for template.isExpression() | |
| 262 | |
| 263 void print() | |
| 264 { | |
| 265 assert(false); | |
| 266 } | |
| 267 | |
| 268 string toChars() | |
| 269 { | |
| 270 scope OutBuffer buf = new OutBuffer(); | |
| 271 HdrGenState hgs; | |
| 272 | |
| 273 toCBuffer(buf, &hgs); | |
| 274 return buf.toChars(); | |
| 275 } | |
| 276 | |
| 95 | 277 void dump(int i) |
| 0 | 278 { |
| 95 | 279 indent(i); |
| 280 writef("%p %s type=%s\n", this, Token.toChars(op), type_print(type)); | |
| 0 | 281 } |
| 282 | |
| 283 void error(T...)(string format, T t) | |
| 284 { | |
| 285 .error(loc, format, t); | |
| 286 } | |
| 287 | |
| 288 void warning(T...)(string formar, T t) | |
| 289 { | |
| 290 .warning(loc, format, t); | |
| 291 } | |
| 292 | |
| 293 void rvalue() | |
| 294 { | |
| 295 if (type && type.toBasetype().ty == TY.Tvoid) | |
| 296 { | |
| 297 error("expression %s is void and has no value", toChars()); | |
| 298 static if (false) { | |
| 299 dump(0); | |
| 300 halt(); | |
| 301 } | |
| 302 type = Type.terror; | |
| 303 } | |
| 304 } | |
| 305 | |
| 306 static Expression combine(Expression e1, Expression e2) | |
| 307 { | |
| 308 if (e1) | |
| 309 { | |
| 310 if (e2) | |
| 311 { | |
| 312 e1 = new CommaExp(e1.loc, e1, e2); | |
| 313 e1.type = e2.type; | |
| 314 } | |
| 315 } | |
| 316 else | |
| 317 { | |
| 318 e1 = e2; | |
| 319 } | |
| 320 | |
| 321 return e1; | |
| 322 } | |
| 323 | |
| 324 static Expressions arraySyntaxCopy(Expressions exps) | |
| 325 { | |
| 326 Expressions a = null; | |
| 327 | |
| 328 if (exps) | |
| 329 { | |
| 330 a = new Expressions(); | |
| 331 a.setDim(exps.dim); | |
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332 for (size_t i = 0; i < a.dim; i++) |
| 0 | 333 { |
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334 auto e = exps[i]; |
| 0 | 335 |
| 336 e = e.syntaxCopy(); | |
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337 a[i] = e; |
| 0 | 338 } |
| 339 } | |
| 340 return a; | |
| 341 } | |
| 342 | |
| 343 ulong toInteger() | |
| 344 { | |
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345 //printf("Expression %s\n", Token.toChars(op)); |
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346 error("Integer constant expression expected instead of %s", toChars()); |
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347 return 0; |
| 0 | 348 } |
| 349 | |
| 350 ulong toUInteger() | |
| 351 { | |
| 352 //printf("Expression %s\n", Token.toChars(op)); | |
| 353 return cast(ulong)toInteger(); | |
| 354 } | |
| 355 | |
| 356 real toReal() | |
| 357 { | |
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358 error("Floating point constant expression expected instead of %s", toChars()); |
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359 return 0; |
| 0 | 360 } |
| 361 | |
| 362 real toImaginary() | |
| 363 { | |
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364 error("Floating point constant expression expected instead of %s", toChars()); |
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df6d0f967680
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365 return 0; |
| 0 | 366 } |
| 367 | |
| 368 Complex!(real) toComplex() | |
| 369 { | |
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84
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370 error("Floating point constant expression expected instead of %s", toChars()); |
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df6d0f967680
implemented a whole bunch of methods to make phobos 2.035 compile
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parents:
84
diff
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371 return Complex!real(0); |
| 0 | 372 } |
| 373 | |
| 374 void toCBuffer(OutBuffer buf, HdrGenState* hgs) | |
| 375 { | |
| 376 buf.writestring(Token.toChars(op)); | |
| 377 } | |
| 378 | |
| 379 void toMangleBuffer(OutBuffer buf) | |
| 380 { | |
| 55 | 381 error("expression %s is not a valid template value argument", toChars()); |
| 0 | 382 assert(false); |
| 55 | 383 version (DEBUG) { |
| 384 dump(0); | |
| 385 } | |
| 0 | 386 } |
| 387 | |
| 66 | 388 /*************************************** |
| 389 * Return !=0 if expression is an lvalue. | |
| 390 */ | |
| 0 | 391 int isLvalue() |
| 392 { | |
| 66 | 393 return 0; |
| 0 | 394 } |
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395 |
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396 /******************************* |
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397 * Give error if we're not an lvalue. |
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398 * If we can, convert expression to be an lvalue. |
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399 */ |
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400 Expression toLvalue(Scope sc, Expression e) |
| 0 | 401 { |
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84
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402 if (!e) |
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403 e = this; |
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df6d0f967680
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404 else if (!loc.filename) |
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df6d0f967680
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Trass3r
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405 loc = e.loc; |
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Trass3r
parents:
84
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406 error("%s is not an lvalue", e.toChars()); |
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df6d0f967680
implemented a whole bunch of methods to make phobos 2.035 compile
Trass3r
parents:
84
diff
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407 return this; |
| 0 | 408 } |
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df6d0f967680
implemented a whole bunch of methods to make phobos 2.035 compile
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parents:
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409 |
| 0 | 410 Expression modifiableLvalue(Scope sc, Expression e) |
| 411 { | |
| 412 //printf("Expression::modifiableLvalue() %s, type = %s\n", toChars(), type.toChars()); | |
| 413 | |
| 414 // See if this expression is a modifiable lvalue (i.e. not const) | |
| 415 version (DMDV2) { | |
| 416 if (type && (!type.isMutable() || !type.isAssignable())) | |
| 417 error("%s is not mutable", e.toChars()); | |
| 418 } | |
| 419 return toLvalue(sc, e); | |
| 420 } | |
| 421 | |
| 422 /************************************** | |
| 423 * Do an implicit cast. | |
| 424 * Issue error if it can't be done. | |
| 425 */ | |
| 426 Expression implicitCastTo(Scope sc, Type t) | |
| 427 { | |
| 428 //printf("Expression.implicitCastTo(%s of type %s) => %s\n", toChars(), type.toChars(), t.toChars()); | |
| 429 | |
| 430 MATCH match = implicitConvTo(t); | |
| 431 if (match) | |
| 432 { | |
| 433 TY tyfrom = type.toBasetype().ty; | |
| 434 TY tyto = t.toBasetype().ty; | |
| 435 | |
| 436 version (DMDV1) { | |
| 437 if (global.params.warnings && | |
| 438 Type.impcnvWarn[tyfrom][tyto] && | |
| 439 op != TOKint64) | |
| 440 { | |
| 441 Expression e = optimize(WANT.WANTflags | WANT.WANTvalue); | |
| 442 | |
| 443 if (e.op == TOK.TOKint64) | |
| 444 return e.implicitCastTo(sc, t); | |
| 445 if (tyfrom == Tint32 && (op == TOKadd || op == TOKmin || op == TOKand || op == TOKor || op == TOKxor)) | |
| 446 { | |
| 447 /* This is really only a semi-kludge fix, | |
| 448 * we really should look at the operands of op | |
| 449 * and see if they are narrower types. | |
| 450 * For example, b=b|b and b=b|7 and s=b+b should be allowed, | |
| 451 * but b=b|i should be an error. | |
| 452 */ | |
| 453 ; | |
| 454 } | |
| 455 else | |
| 456 { | |
| 457 warning("implicit conversion of expression (%s) of type %s to %s can cause loss of data", toChars(), type.toChars(), t.toChars()); | |
| 458 } | |
| 459 } | |
| 460 } | |
| 461 version (DMDV2) { | |
| 462 if (match == MATCH.MATCHconst && t == type.constOf()) | |
| 463 { | |
| 464 Expression e = copy(); | |
| 465 e.type = t; | |
| 466 return e; | |
| 467 } | |
| 468 } | |
| 469 return castTo(sc, t); | |
| 470 } | |
| 471 | |
| 472 Expression e = optimize(WANT.WANTflags | WANT.WANTvalue); | |
| 473 if (e != this) | |
| 474 return e.implicitCastTo(sc, t); | |
| 475 | |
| 476 static if (false) { | |
| 477 printf("ty = %d\n", type.ty); | |
| 478 print(); | |
| 479 type.print(); | |
| 480 printf("to:\n"); | |
| 481 t.print(); | |
| 482 printf("%p %p type: %s to: %s\n", type.deco, t.deco, type.deco, t.deco); | |
| 483 //printf("%p %p %p\n", type.nextOf().arrayOf(), type, t); | |
| 484 fflush(stdout); | |
| 485 } | |
| 486 if (!t.deco) { | |
| 487 /* Can happen with: | |
| 488 * enum E { One } | |
| 489 * class A | |
| 490 * { static void fork(EDG dg) { dg(E.One); } | |
| 491 * alias void delegate(E) EDG; | |
| 492 * } | |
| 493 * Should eventually make it work. | |
| 494 */ | |
| 495 error("forward reference to type %s", t.toChars()); | |
| 496 } else if (t.reliesOnTident()) { | |
| 497 error("forward reference to type %s", t.reliesOnTident().toChars()); | |
| 498 } | |
| 499 | |
| 500 error("cannot implicitly convert expression (%s) of type %s to %s", toChars(), type.toChars(), t.toChars()); | |
| 501 return castTo(sc, t); | |
| 502 } | |
| 503 | |
| 504 /******************************************* | |
| 505 * Return !=0 if we can implicitly convert this to type t. | |
| 506 * Don't do the actual cast. | |
| 507 */ | |
| 508 MATCH implicitConvTo(Type t) | |
| 509 { | |
| 510 static if (false) { | |
| 511 printf("Expression.implicitConvTo(this=%s, type=%s, t=%s)\n", | |
| 512 toChars(), type.toChars(), t.toChars()); | |
| 513 } | |
| 514 //static int nest; if (++nest == 10) halt(); | |
| 515 if (!type) | |
| 516 { | |
| 517 error("%s is not an expression", toChars()); | |
| 518 type = Type.terror; | |
| 519 } | |
| 520 Expression e = optimize(WANT.WANTvalue | WANT.WANTflags); | |
| 521 if (e.type == t) | |
| 522 return MATCH.MATCHexact; | |
| 523 if (e != this) | |
| 524 { | |
| 525 //printf("\toptimized to %s of type %s\n", e.toChars(), e.type.toChars()); | |
| 526 return e.implicitConvTo(t); | |
| 527 } | |
| 528 MATCH match = type.implicitConvTo(t); | |
| 529 if (match != MATCH.MATCHnomatch) | |
| 530 return match; | |
| 531 | |
| 532 /* See if we can do integral narrowing conversions | |
| 533 */ | |
| 534 if (type.isintegral() && t.isintegral() && | |
| 535 type.isTypeBasic() && t.isTypeBasic()) | |
| 536 { | |
| 537 IntRange ir = getIntRange(); | |
| 538 if (ir.imax <= t.sizemask()) | |
| 539 return MATCH.MATCHconvert; | |
| 540 } | |
| 541 | |
| 542 static if (false) { | |
| 543 Type tb = t.toBasetype(); | |
| 544 if (tb.ty == Tdelegate) | |
| 545 { | |
| 546 TypeDelegate td = cast(TypeDelegate)tb; | |
| 547 TypeFunction tf = cast(TypeFunction)td.nextOf(); | |
| 548 | |
| 549 if (!tf.varargs && !(tf.arguments && tf.arguments.dim)) | |
| 550 { | |
| 551 match = type.implicitConvTo(tf.nextOf()); | |
| 552 if (match) | |
| 553 return match; | |
| 554 if (tf.nextOf().toBasetype().ty == Tvoid) | |
| 555 return MATCH.MATCHconvert; | |
| 556 } | |
| 557 } | |
| 558 } | |
| 559 return MATCH.MATCHnomatch; | |
| 560 } | |
| 561 | |
| 562 IntRange getIntRange() | |
| 563 { | |
| 53 | 564 IntRange ir; |
| 565 ir.imin = 0; | |
| 73 | 566 if (type.isintegral()) |
| 567 ir.imax = type.sizemask(); | |
| 568 else | |
| 569 ir.imax = 0xFFFFFFFFFFFFFFFFUL; // assume the worst | |
| 570 | |
| 53 | 571 return ir; |
| 0 | 572 } |
| 573 | |
| 574 /************************************** | |
| 575 * Do an explicit cast. | |
| 576 */ | |
| 577 Expression castTo(Scope sc, Type t) | |
| 578 { | |
| 579 //printf("Expression.castTo(this=%s, t=%s)\n", toChars(), t.toChars()); | |
| 580 static if (false) { | |
| 581 writef("Expression.castTo(this=%s, type=%s, t=%s)\n", | |
| 582 toChars(), type.toChars(), t.toChars()); | |
| 583 } | |
| 584 if (type is t) | |
| 585 return this; | |
| 586 Expression e = this; | |
| 587 Type tb = t.toBasetype(); | |
| 588 Type typeb = type.toBasetype(); | |
| 589 if (tb != typeb) | |
| 590 { | |
| 591 // Do (type *) cast of (type [dim]) | |
| 592 if (tb.ty == TY.Tpointer && typeb.ty == TY.Tsarray | |
| 593 ) | |
| 594 { | |
| 595 //printf("Converting [dim] to *\n"); | |
| 596 | |
| 597 if (typeb.size(loc) == 0) | |
| 598 e = new NullExp(loc); | |
| 599 else | |
| 600 e = new AddrExp(loc, e); | |
| 601 } | |
| 602 else { | |
| 603 static if (false) { | |
| 604 if (tb.ty == Tdelegate && type.ty != Tdelegate) | |
| 605 { | |
| 606 TypeDelegate td = cast(TypeDelegate)tb; | |
| 607 TypeFunction tf = cast(TypeFunction)td.nextOf(); | |
| 608 return toDelegate(sc, tf.nextOf()); | |
| 609 } | |
| 610 } | |
| 611 if (typeb.ty == TY.Tstruct) | |
| 612 { | |
| 613 TypeStruct ts = cast(TypeStruct)typeb; | |
| 614 if (!(tb.ty == TY.Tstruct && ts.sym == (cast(TypeStruct)tb).sym) && | |
| 615 ts.sym.aliasthis) | |
| 616 { /* Forward the cast to our alias this member, rewrite to: | |
| 617 * cast(to)e1.aliasthis | |
| 618 */ | |
| 619 Expression e1 = new DotIdExp(loc, this, ts.sym.aliasthis.ident); | |
| 620 Expression e2 = new CastExp(loc, e1, tb); | |
| 621 e2 = e2.semantic(sc); | |
| 622 return e2; | |
| 623 } | |
| 624 } | |
| 625 else if (typeb.ty == TY.Tclass) | |
| 626 { | |
| 627 TypeClass ts = cast(TypeClass)typeb; | |
| 628 if (tb.ty != TY.Tclass && ts.sym.aliasthis) | |
| 629 { /* Forward the cast to our alias this member, rewrite to: | |
| 630 * cast(to)e1.aliasthis | |
| 631 */ | |
| 632 Expression e1 = new DotIdExp(loc, this, ts.sym.aliasthis.ident); | |
| 633 Expression e2 = new CastExp(loc, e1, tb); | |
| 634 e2 = e2.semantic(sc); | |
| 635 return e2; | |
| 636 } | |
| 637 } | |
| 638 e = new CastExp(loc, e, tb); | |
| 639 } | |
| 640 } | |
| 641 else | |
| 642 { | |
| 643 e = e.copy(); // because of COW for assignment to e.type | |
| 644 } | |
| 645 | |
| 646 assert(e != this); | |
| 647 e.type = t; | |
| 648 //printf("Returning: %s\n", e.toChars()); | |
| 649 return e; | |
| 650 } | |
| 651 | |
| 652 /************************************ | |
| 653 * Detect cases where pointers to the stack can 'escape' the | |
| 654 * lifetime of the stack frame. | |
| 655 */ | |
| 656 void checkEscape() | |
| 657 { | |
| 658 } | |
| 659 | |
| 135 | 660 void checkEscapeRef() |
| 661 { | |
| 662 } | |
| 663 | |
| 0 | 664 void checkScalar() |
| 665 { | |
| 666 if (!type.isscalar()) | |
| 667 error("'%s' is not a scalar, it is a %s", toChars(), type.toChars()); | |
| 668 | |
| 669 rvalue(); | |
| 670 } | |
| 671 | |
| 672 void checkNoBool() | |
| 673 { | |
| 674 if (type.toBasetype().ty == TY.Tbool) | |
| 675 error("operation not allowed on bool '%s'", toChars()); | |
| 676 } | |
| 677 | |
| 678 Expression checkIntegral() | |
| 679 { | |
| 680 if (!type.isintegral()) | |
| 681 { | |
| 682 error("'%s' is not of integral type, it is a %s", toChars(), type.toChars()); | |
| 683 return new ErrorExp(); | |
| 684 } | |
| 685 | |
| 686 rvalue(); | |
| 687 return this; | |
| 688 } | |
| 689 | |
| 690 Expression checkArithmetic() | |
| 691 { | |
| 692 if (!type.isintegral() && !type.isfloating()) | |
| 693 { | |
| 694 error("'%s' is not of arithmetic type, it is a %s", toChars(), type.toChars()); | |
| 695 return new ErrorExp(); | |
| 696 } | |
| 697 | |
| 698 rvalue(); | |
| 699 return this; | |
| 700 } | |
| 701 | |
| 702 void checkDeprecated(Scope sc, Dsymbol s) | |
| 703 { | |
| 704 s.checkDeprecated(loc, sc); | |
| 705 } | |
| 706 | |
| 707 void checkPurity(Scope sc, FuncDeclaration f) | |
| 708 { | |
| 709 static if (true) { | |
| 710 if (sc.func) | |
| 711 { | |
|
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712 /* Given: |
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713 * void f() |
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714 * { pure void g() |
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715 * { |
|
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716 * void h() |
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717 * { |
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718 * void i() { } |
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719 * } |
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720 * } |
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721 * } |
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722 * g() can call h() but not f() |
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723 * i() can call h() and g() but not f() |
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724 */ |
| 0 | 725 FuncDeclaration outerfunc = sc.func; |
| 726 while (outerfunc.toParent2() && outerfunc.toParent2().isFuncDeclaration()) | |
| 727 { | |
| 728 outerfunc = outerfunc.toParent2().isFuncDeclaration(); | |
| 729 } | |
|
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730 if (outerfunc.isPure() && !sc.intypeof && (!f.isNested() && !f.isPure())) |
| 0 | 731 error("pure function '%s' cannot call impure function '%s'\n", |
| 732 sc.func.toChars(), f.toChars()); | |
| 733 } | |
| 734 } else { | |
| 735 if (sc.func && sc.func.isPure() && !sc.intypeof && !f.isPure()) | |
| 736 error("pure function '%s' cannot call impure function '%s'\n", | |
| 737 sc.func.toChars(), .toChars()); | |
| 738 } | |
| 739 } | |
|
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740 |
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741 void checkSafety(Scope sc, FuncDeclaration f) |
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742 { |
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743 if (sc.func && sc.func.isSafe() && !sc.intypeof && |
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744 !f.isSafe() && !f.isTrusted()) |
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745 error("safe function '%s' cannot call system function '%s'\n", |
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746 sc.func.toChars(), f.toChars()); |
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747 } |
| 0 | 748 |
| 749 /***************************** | |
| 750 * Check that expression can be tested for true or false. | |
| 751 */ | |
| 752 Expression checkToBoolean() | |
| 753 { | |
| 754 // Default is 'yes' - do nothing | |
| 755 | |
| 756 debug { | |
| 757 if (!type) | |
| 758 dump(0); | |
| 759 } | |
| 760 | |
| 761 if (!type.checkBoolean()) | |
| 762 { | |
| 763 error("expression %s of type %s does not have a boolean value", toChars(), type.toChars()); | |
| 764 } | |
| 765 | |
| 766 return this; | |
| 767 } | |
| 768 | |
| 769 Expression checkToPointer() | |
| 770 { | |
| 109 | 771 //writef("Expression::checkToPointer()\n"); |
| 772 Expression e = this; | |
| 0 | 773 |
| 109 | 774 version(SARRAYVALUE) {} else |
| 775 { | |
| 0 | 776 // If C static array, convert to pointer |
| 109 | 777 Type tb = type.toBasetype(); |
| 0 | 778 if (tb.ty == Tsarray) |
| 779 { | |
| 780 TypeSArray ts = cast(TypeSArray)tb; | |
| 781 if (ts.size(loc) == 0) | |
| 782 e = new NullExp(loc); | |
| 783 else | |
| 784 e = new AddrExp(loc, this); | |
| 785 e.type = ts.next.pointerTo(); | |
| 786 } | |
| 109 | 787 } |
| 0 | 788 return e; |
| 789 } | |
| 790 | |
| 791 Expression addressOf(Scope sc) | |
| 792 { | |
| 793 //printf("Expression::addressOf()\n"); | |
| 794 Expression e = toLvalue(sc, null); | |
| 795 e = new AddrExp(loc, e); | |
| 796 e.type = type.pointerTo(); | |
| 797 return e; | |
| 798 } | |
| 799 | |
| 800 /****************************** | |
| 801 * If this is a reference, dereference it. | |
| 802 */ | |
| 803 Expression deref() | |
| 804 { | |
| 805 //printf("Expression::deref()\n"); | |
| 73 | 806 // type could be null if forward referencing an 'auto' variable |
| 807 if (type && type.ty == Treference) | |
| 808 { | |
| 0 | 809 Expression e = new PtrExp(loc, this); |
| 810 e.type = (cast(TypeReference)type).next; | |
| 811 return e; | |
| 812 } | |
| 813 return this; | |
| 814 } | |
| 815 | |
| 816 /*********************************** | |
| 817 * Do integral promotions (convertchk). | |
| 818 * Don't convert <array of> to <pointer to> | |
| 819 */ | |
| 820 Expression integralPromotions(Scope sc) | |
| 821 { | |
| 822 Expression e = this; | |
| 823 | |
| 824 //printf("integralPromotions %s %s\n", e.toChars(), e.type.toChars()); | |
| 825 switch (type.toBasetype().ty) | |
| 826 { | |
| 827 case TY.Tvoid: | |
| 828 error("void has no value"); | |
| 829 break; | |
| 830 | |
| 831 case TY.Tint8: | |
| 832 case TY.Tuns8: | |
| 833 case TY.Tint16: | |
| 834 case TY.Tuns16: | |
| 835 case TY.Tbit: | |
| 836 case TY.Tbool: | |
| 837 case TY.Tchar: | |
| 838 case TY.Twchar: | |
| 839 e = e.castTo(sc, Type.tint32); | |
| 840 break; | |
| 841 | |
| 842 case TY.Tdchar: | |
| 843 e = e.castTo(sc, Type.tuns32); | |
| 844 break; | |
| 845 default: | |
| 846 break; /// | |
| 847 } | |
| 848 return e; | |
| 849 } | |
| 850 | |
| 55 | 851 /******************************************** |
| 852 * Convert from expression to delegate that returns the expression, | |
| 853 * i.e. convert: | |
| 854 * expr | |
| 855 * to: | |
| 856 * t delegate() { return expr; } | |
| 857 */ | |
| 0 | 858 Expression toDelegate(Scope sc, Type t) |
| 859 { | |
| 55 | 860 //printf("Expression.toDelegate(t = %s) %s\n", t.toChars(), toChars()); |
| 861 TypeFunction tf = new TypeFunction(null, t, 0, LINKd); | |
| 862 FuncLiteralDeclaration fld = new FuncLiteralDeclaration(loc, loc, tf, TOKdelegate, null); | |
| 863 Expression e; | |
| 864 static if (true) { | |
| 865 sc = sc.push(); | |
| 866 sc.parent = fld; // set current function to be the delegate | |
| 867 e = this; | |
| 868 e.scanForNestedRef(sc); | |
| 869 sc = sc.pop(); | |
| 870 } else { | |
| 871 e = this.syntaxCopy(); | |
| 872 } | |
| 873 Statement s = new ReturnStatement(loc, e); | |
| 874 fld.fbody = s; | |
| 875 e = new FuncExp(loc, fld); | |
| 876 e = e.semantic(sc); | |
| 877 return e; | |
| 0 | 878 } |
| 879 | |
| 880 void scanForNestedRef(Scope sc) | |
| 881 { | |
| 55 | 882 //printf("Expression.scanForNestedRef(%s)\n", toChars()); |
| 0 | 883 } |
| 884 | |
| 885 Expression optimize(int result) | |
| 886 { | |
| 887 //printf("Expression.optimize(result = x%x) %s\n", result, toChars()); | |
| 888 return this; | |
| 889 } | |
| 890 | |
|
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891 Expression interpret(InterState istate) |
| 0 | 892 { |
|
93
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893 version(LOG) |
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894 { |
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895 writef("Expression::interpret() %s\n", toChars()); |
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896 writef("type = %s\n", type.toChars()); |
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897 dump(0); |
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898 } |
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899 error("Cannot interpret %s at compile time", toChars()); |
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900 return EXP_CANT_INTERPRET; |
| 0 | 901 } |
| 902 | |
| 903 int isConst() | |
| 904 { | |
| 905 //printf("Expression::isConst(): %s\n", toChars()); | |
| 906 return 0; | |
| 907 } | |
| 908 | |
| 909 /******************************** | |
| 910 * Does this expression statically evaluate to a boolean TRUE or FALSE? | |
| 911 */ | |
| 912 bool isBool(bool result) | |
| 913 { | |
| 914 return false; | |
| 915 } | |
| 916 | |
| 917 int isBit() | |
| 918 { | |
| 919 assert(false); | |
| 920 } | |
| 921 | |
| 922 /******************************** | |
| 923 * Check for expressions that have no use. | |
| 924 * Input: | |
| 925 * flag 0 not going to use the result, so issue error message if no | |
| 926 * side effects | |
| 927 * 1 the result of the expression is used, but still check | |
| 928 * for useless subexpressions | |
| 929 * 2 do not issue error messages, just return !=0 if expression | |
| 930 * has side effects | |
| 931 */ | |
| 932 bool checkSideEffect(int flag) | |
| 933 { | |
| 934 if (flag == 0) | |
| 935 { | |
| 73 | 936 if (op == TOKerror) |
| 937 { | |
| 938 // Error should have already been printed | |
| 939 } | |
| 940 else if (op == TOKimport) | |
| 0 | 941 error("%s has no effect", toChars()); |
| 942 else | |
| 943 error("%s has no effect in expression (%s)", | |
| 944 | |
| 945 Token.toChars(op), toChars()); | |
| 946 } | |
| 947 | |
| 948 return false; | |
| 949 } | |
| 950 | |
| 951 bool canThrow() | |
| 952 { | |
| 953 version (DMDV2) { | |
| 954 return false; | |
| 955 } else { | |
| 956 return true; | |
| 957 } | |
| 958 } | |
| 959 | |
|
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960 /**************************************** |
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961 * Resolve __LINE__ and __FILE__ to loc. |
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962 */ |
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963 |
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964 Expression resolveLoc(Loc loc, Scope sc) |
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965 { |
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966 return this; |
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967 } |
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968 |
| 0 | 969 int inlineCost(InlineCostState* ics) |
| 970 { | |
| 971 return 1; | |
| 972 } | |
| 973 | |
| 974 Expression doInline(InlineDoState ids) | |
| 975 { | |
| 976 //printf("Expression.doInline(%s): %s\n", Token.toChars(op), toChars()); | |
| 977 return copy(); | |
| 978 } | |
| 979 | |
| 980 Expression inlineScan(InlineScanState* iss) | |
| 981 { | |
| 982 return this; | |
| 983 } | |
| 984 | |
| 985 /*********************************** | |
| 986 * Determine if operands of binary op can be reversed | |
| 987 * to fit operator overload. | |
| 988 */ | |
| 989 | |
| 990 // For operator overloading | |
| 991 bool isCommutative() | |
| 992 { | |
| 993 return false; // default is no reverse | |
| 994 } | |
| 995 | |
| 996 /*********************************** | |
| 997 * Get Identifier for operator overload. | |
| 998 */ | |
| 999 Identifier opId() | |
| 1000 { | |
| 1001 assert(false); | |
| 1002 } | |
| 1003 | |
| 1004 /*********************************** | |
| 1005 * Get Identifier for reverse operator overload, | |
| 1006 * null if not supported for this operator. | |
| 1007 */ | |
| 1008 Identifier opId_r() | |
| 1009 { | |
| 1010 return null; | |
| 1011 } | |
| 1012 | |
| 1013 // For array ops | |
|
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1014 /****************************************** |
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1015 * Construct the identifier for the array operation function, |
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1016 * and build the argument list to pass to it. |
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1017 */ |
| 0 | 1018 void buildArrayIdent(OutBuffer buf, Expressions arguments) |
| 1019 { | |
|
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1020 buf.writestring("Exp"); |
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1021 arguments.shift(this); |
| 0 | 1022 } |
| 1023 | |
|
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1024 Expression buildArrayLoop(Parameters fparams) |
| 0 | 1025 { |
|
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1026 Identifier id = Identifier.generateId("c", fparams.dim); |
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1027 auto param = new Parameter(STC.STCundefined, type, id, null); |
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ClassDeclarations, Arguments -> Vector
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1028 fparams.shift(param); |
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1029 Expression e = new IdentifierExp(Loc(0), id); |
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1030 return e; |
| 0 | 1031 } |
| 95 | 1032 |
| 1033 /*********************************************** | |
| 1034 * Test if operand is a valid array op operand. | |
| 1035 */ | |
| 1036 int isArrayOperand() | |
| 1037 { | |
| 1038 //writef("Expression::isArrayOperand() %s\n", toChars()); | |
| 1039 if (op == TOKslice) | |
| 1040 return 1; | |
| 1041 if (type.toBasetype().ty == TY.Tarray) | |
| 1042 { | |
| 1043 switch (op) | |
| 1044 { | |
| 1045 case TOKadd: | |
| 1046 case TOKmin: | |
| 1047 case TOKmul: | |
| 1048 case TOKdiv: | |
| 1049 case TOKmod: | |
| 1050 case TOKxor: | |
| 1051 case TOKand: | |
| 1052 case TOKor: | |
| 1053 case TOKneg: | |
| 1054 case TOKtilde: | |
| 1055 return 1; | |
| 1056 | |
| 1057 default: | |
| 1058 break; | |
| 1059 } | |
| 1060 } | |
| 1061 return 0; | |
| 1062 } | |
| 1063 | |
| 0 | 1064 // Back end |
| 1065 elem* toElem(IRState* irs) | |
| 1066 { | |
| 1067 assert(false); | |
| 1068 } | |
| 1069 | |
| 1070 dt_t** toDt(dt_t** pdt) | |
| 1071 { | |
| 1072 assert(false); | |
| 1073 } | |
|
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1074 } |
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1075 |
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1076 alias Vector!Expression Expressions; |