Mercurial > projects > ddmd
annotate dmd/Expression.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 |
|---|---|
| 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; | |
| 141 | 56 import dmd.backend.Util; |
| 0 | 57 import dmd.backend.dt_t; |
| 58 | |
| 4 | 59 import core.memory; |
| 2 | 60 |
| 0 | 61 import std.stdio : writef; |
| 62 | |
| 63 import std.conv; | |
| 64 | |
| 65 /* Things like: | |
| 66 * int.size | |
| 67 * foo.size | |
| 68 * (foo).size | |
| 69 * cast(foo).size | |
| 70 */ | |
| 71 | |
| 72 Expression typeDotIdExp(Loc loc, Type type, Identifier ident) | |
| 73 { | |
| 74 return new DotIdExp(loc, new TypeExp(loc, type), ident); | |
| 75 } | |
| 76 | |
| 77 /***************************************** | |
| 78 * Determine if 'this' is available. | |
| 79 * If it is, return the FuncDeclaration that has it. | |
| 80 */ | |
| 81 | |
| 82 FuncDeclaration hasThis(Scope sc) | |
| 83 { | |
| 84 FuncDeclaration fd; | |
| 85 FuncDeclaration fdthis; | |
| 86 | |
| 87 //printf("hasThis()\n"); | |
| 88 fdthis = sc.parent.isFuncDeclaration(); | |
| 89 //printf("fdthis = %p, '%s'\n", fdthis, fdthis ? fdthis.toChars() : ""); | |
| 90 | |
| 91 // Go upwards until we find the enclosing member function | |
| 92 fd = fdthis; | |
| 93 while (1) | |
| 94 { | |
| 95 if (!fd) | |
| 96 { | |
| 97 goto Lno; | |
| 98 } | |
| 99 if (!fd.isNested()) | |
| 100 break; | |
| 101 | |
| 102 Dsymbol parent = fd.parent; | |
| 103 while (parent) | |
| 104 { | |
| 105 TemplateInstance ti = parent.isTemplateInstance(); | |
| 106 if (ti) | |
| 107 parent = ti.parent; | |
| 108 else | |
| 109 break; | |
| 110 } | |
| 111 | |
| 112 fd = fd.parent.isFuncDeclaration(); | |
| 113 } | |
| 114 | |
| 115 if (!fd.isThis()) | |
| 116 { | |
| 117 //printf("test '%s'\n", fd.toChars()); | |
| 118 goto Lno; | |
| 119 } | |
| 120 | |
| 121 assert(fd.vthis); | |
| 122 return fd; | |
| 123 | |
| 124 Lno: | |
| 125 return null; // don't have 'this' available | |
| 126 } | |
| 127 | |
| 128 /*************************************** | |
| 129 * Pull out any properties. | |
| 130 */ | |
| 131 Expression resolveProperties(Scope sc, Expression e) | |
| 132 { | |
| 133 //printf("resolveProperties(%s)\n", e.toChars()); | |
| 134 if (e.type) | |
| 135 { | |
| 136 Type t = e.type.toBasetype(); | |
| 137 | |
| 138 if (t.ty == TY.Tfunction || e.op == TOK.TOKoverloadset) | |
| 139 { | |
| 109 | 140 static if(false) |
| 141 { | |
| 142 if (t.ty == Tfunction && !(cast(TypeFunction)t).isproperty) | |
| 143 error(e.loc, "not a property %s\n", e.toChars()); | |
| 144 } | |
| 0 | 145 e = new CallExp(e.loc, e); |
| 146 e = e.semantic(sc); | |
| 147 } | |
| 148 | |
| 149 /* Look for e being a lazy parameter; rewrite as delegate call | |
| 150 */ | |
| 151 else if (e.op == TOK.TOKvar) | |
| 152 { VarExp ve = cast(VarExp)e; | |
| 153 | |
| 154 if (ve.var.storage_class & STC.STClazy) | |
| 155 { | |
| 156 e = new CallExp(e.loc, e); | |
| 157 e = e.semantic(sc); | |
| 158 } | |
| 159 } | |
| 160 | |
| 161 else if (e.op == TOK.TOKdotexp) | |
| 162 { | |
| 163 e.error("expression has no value"); | |
| 164 } | |
| 165 } | |
| 166 else if (e.op == TOK.TOKdottd) | |
| 167 { | |
| 168 e = new CallExp(e.loc, e); | |
| 169 e = e.semantic(sc); | |
| 170 } | |
| 171 | |
| 172 return e; | |
| 173 } | |
| 174 | |
| 95 | 175 void indent(int indent) |
| 176 { | |
| 177 foreach (i; 0 .. indent) | |
| 178 writef(" "); | |
| 179 } | |
| 180 | |
| 181 string type_print(Type type) | |
| 182 { | |
| 183 return type ? type.toChars() : "null"; | |
| 184 } | |
| 185 | |
| 178 | 186 import dmd.TObject; |
| 187 | |
| 188 class Expression : TObject | |
| 0 | 189 { |
| 190 Loc loc; // file location | |
| 191 TOK op; // handy to minimize use of dynamic_cast | |
| 192 Type type; // !=null means that semantic() has been run | |
| 193 int size; // # of bytes in Expression so we can copy() it | |
| 194 | |
| 195 this(Loc loc, TOK op, int size) | |
| 196 { | |
| 178 | 197 register(); |
| 0 | 198 this.loc = loc; |
| 199 //writef("Expression.Expression(op = %d %s) this = %p\n", op, to!(string)(op), this); | |
| 200 this.op = op; | |
| 201 this.size = size; | |
| 202 type = null; | |
| 203 } | |
| 204 | |
| 45 | 205 bool equals(Object o) |
| 0 | 206 { |
| 207 return this is o; | |
| 208 } | |
| 209 | |
| 210 /********************************* | |
| 211 * Does *not* do a deep copy. | |
| 212 */ | |
| 178 | 213 Expression copy() |
| 0 | 214 { |
| 178 | 215 return cloneThis(this); |
| 0 | 216 } |
| 217 | |
| 218 Expression syntaxCopy() | |
| 219 { | |
| 220 //printf("Expression::syntaxCopy()\n"); | |
| 221 //dump(0); | |
| 222 return copy(); | |
| 223 } | |
| 224 | |
| 225 Expression semantic(Scope sc) | |
| 226 { | |
| 227 version (LOGSEMANTIC) { | |
| 228 printf("Expression.semantic() %s\n", toChars()); | |
| 229 } | |
| 230 if (type) | |
| 231 type = type.semantic(loc, sc); | |
| 232 else | |
| 233 type = Type.tvoid; | |
| 234 return this; | |
| 235 } | |
| 236 | |
| 237 Expression trySemantic(Scope sc) | |
| 238 { | |
| 239 uint errors = global.errors; | |
| 240 global.gag++; | |
| 241 Expression e = semantic(sc); | |
| 242 global.gag--; | |
| 243 if (errors != global.errors) | |
| 244 { | |
| 245 global.errors = errors; | |
| 246 e = null; | |
| 247 } | |
| 248 return e; | |
| 249 } | |
| 250 | |
| 251 DYNCAST dyncast() { return DYNCAST.DYNCAST_EXPRESSION; } // kludge for template.isExpression() | |
| 252 | |
| 253 void print() | |
| 254 { | |
| 255 assert(false); | |
| 256 } | |
| 257 | |
| 258 string toChars() | |
| 259 { | |
| 260 scope OutBuffer buf = new OutBuffer(); | |
| 261 HdrGenState hgs; | |
| 262 | |
| 263 toCBuffer(buf, &hgs); | |
| 264 return buf.toChars(); | |
| 265 } | |
| 266 | |
| 95 | 267 void dump(int i) |
| 0 | 268 { |
| 95 | 269 indent(i); |
| 270 writef("%p %s type=%s\n", this, Token.toChars(op), type_print(type)); | |
| 0 | 271 } |
| 272 | |
| 273 void error(T...)(string format, T t) | |
| 274 { | |
| 275 .error(loc, format, t); | |
| 276 } | |
| 277 | |
| 278 void warning(T...)(string formar, T t) | |
| 279 { | |
| 280 .warning(loc, format, t); | |
| 281 } | |
| 282 | |
| 283 void rvalue() | |
| 284 { | |
| 285 if (type && type.toBasetype().ty == TY.Tvoid) | |
| 286 { | |
| 287 error("expression %s is void and has no value", toChars()); | |
| 288 static if (false) { | |
| 289 dump(0); | |
| 290 halt(); | |
| 291 } | |
| 292 type = Type.terror; | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 static Expression combine(Expression e1, Expression e2) | |
| 297 { | |
| 298 if (e1) | |
| 299 { | |
| 300 if (e2) | |
| 301 { | |
| 302 e1 = new CommaExp(e1.loc, e1, e2); | |
| 303 e1.type = e2.type; | |
| 304 } | |
| 305 } | |
| 306 else | |
| 307 { | |
| 308 e1 = e2; | |
| 309 } | |
| 310 | |
| 311 return e1; | |
| 312 } | |
| 313 | |
| 314 static Expressions arraySyntaxCopy(Expressions exps) | |
| 315 { | |
| 316 Expressions a = null; | |
| 317 | |
| 318 if (exps) | |
| 319 { | |
| 320 a = new Expressions(); | |
| 321 a.setDim(exps.dim); | |
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322 for (size_t i = 0; i < a.dim; i++) |
| 0 | 323 { |
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324 auto e = exps[i]; |
| 0 | 325 |
| 179 | 326 if (e) |
| 327 e = e.syntaxCopy(); | |
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328 a[i] = e; |
| 0 | 329 } |
| 330 } | |
| 331 return a; | |
| 332 } | |
| 333 | |
| 334 ulong toInteger() | |
| 335 { | |
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336 //printf("Expression %s\n", Token.toChars(op)); |
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337 error("Integer constant expression expected instead of %s", toChars()); |
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338 return 0; |
| 0 | 339 } |
| 340 | |
| 341 ulong toUInteger() | |
| 342 { | |
| 343 //printf("Expression %s\n", Token.toChars(op)); | |
| 344 return cast(ulong)toInteger(); | |
| 345 } | |
| 346 | |
| 347 real toReal() | |
| 348 { | |
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349 error("Floating point constant expression expected instead of %s", toChars()); |
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350 return 0; |
| 0 | 351 } |
| 352 | |
| 353 real toImaginary() | |
| 354 { | |
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355 error("Floating point constant expression expected instead of %s", toChars()); |
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356 return 0; |
| 0 | 357 } |
| 358 | |
| 359 Complex!(real) toComplex() | |
| 360 { | |
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361 error("Floating point constant expression expected instead of %s", toChars()); |
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362 return Complex!real(0); |
| 0 | 363 } |
| 364 | |
| 365 void toCBuffer(OutBuffer buf, HdrGenState* hgs) | |
| 366 { | |
| 367 buf.writestring(Token.toChars(op)); | |
| 368 } | |
| 369 | |
| 370 void toMangleBuffer(OutBuffer buf) | |
| 371 { | |
| 55 | 372 error("expression %s is not a valid template value argument", toChars()); |
| 0 | 373 assert(false); |
| 55 | 374 version (DEBUG) { |
| 375 dump(0); | |
| 376 } | |
| 0 | 377 } |
| 378 | |
| 66 | 379 /*************************************** |
| 380 * Return !=0 if expression is an lvalue. | |
| 381 */ | |
| 0 | 382 int isLvalue() |
| 383 { | |
| 66 | 384 return 0; |
| 0 | 385 } |
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386 |
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387 /******************************* |
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388 * Give error if we're not an lvalue. |
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389 * If we can, convert expression to be an lvalue. |
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390 */ |
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391 Expression toLvalue(Scope sc, Expression e) |
| 0 | 392 { |
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393 if (!e) |
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394 e = this; |
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395 else if (!loc.filename) |
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396 loc = e.loc; |
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397 error("%s is not an lvalue", e.toChars()); |
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398 return this; |
| 0 | 399 } |
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400 |
| 0 | 401 Expression modifiableLvalue(Scope sc, Expression e) |
| 402 { | |
| 403 //printf("Expression::modifiableLvalue() %s, type = %s\n", toChars(), type.toChars()); | |
| 404 | |
| 405 // See if this expression is a modifiable lvalue (i.e. not const) | |
| 406 version (DMDV2) { | |
| 407 if (type && (!type.isMutable() || !type.isAssignable())) | |
| 408 error("%s is not mutable", e.toChars()); | |
| 409 } | |
| 410 return toLvalue(sc, e); | |
| 411 } | |
| 412 | |
| 413 /************************************** | |
| 414 * Do an implicit cast. | |
| 415 * Issue error if it can't be done. | |
| 416 */ | |
| 417 Expression implicitCastTo(Scope sc, Type t) | |
| 418 { | |
| 419 //printf("Expression.implicitCastTo(%s of type %s) => %s\n", toChars(), type.toChars(), t.toChars()); | |
| 420 | |
| 421 MATCH match = implicitConvTo(t); | |
| 422 if (match) | |
| 423 { | |
| 424 TY tyfrom = type.toBasetype().ty; | |
| 425 TY tyto = t.toBasetype().ty; | |
| 426 | |
| 427 version (DMDV1) { | |
| 428 if (global.params.warnings && | |
| 429 Type.impcnvWarn[tyfrom][tyto] && | |
| 430 op != TOKint64) | |
| 431 { | |
| 432 Expression e = optimize(WANT.WANTflags | WANT.WANTvalue); | |
| 433 | |
| 434 if (e.op == TOK.TOKint64) | |
| 435 return e.implicitCastTo(sc, t); | |
| 436 if (tyfrom == Tint32 && (op == TOKadd || op == TOKmin || op == TOKand || op == TOKor || op == TOKxor)) | |
| 437 { | |
| 438 /* This is really only a semi-kludge fix, | |
| 439 * we really should look at the operands of op | |
| 440 * and see if they are narrower types. | |
| 441 * For example, b=b|b and b=b|7 and s=b+b should be allowed, | |
| 442 * but b=b|i should be an error. | |
| 443 */ | |
| 444 ; | |
| 445 } | |
| 446 else | |
| 447 { | |
| 448 warning("implicit conversion of expression (%s) of type %s to %s can cause loss of data", toChars(), type.toChars(), t.toChars()); | |
| 449 } | |
| 450 } | |
| 451 } | |
| 452 version (DMDV2) { | |
| 453 if (match == MATCH.MATCHconst && t == type.constOf()) | |
| 454 { | |
| 455 Expression e = copy(); | |
| 456 e.type = t; | |
| 457 return e; | |
| 458 } | |
| 459 } | |
| 460 return castTo(sc, t); | |
| 461 } | |
| 462 | |
| 463 Expression e = optimize(WANT.WANTflags | WANT.WANTvalue); | |
| 464 if (e != this) | |
| 465 return e.implicitCastTo(sc, t); | |
| 466 | |
| 467 static if (false) { | |
| 468 printf("ty = %d\n", type.ty); | |
| 469 print(); | |
| 470 type.print(); | |
| 471 printf("to:\n"); | |
| 472 t.print(); | |
| 473 printf("%p %p type: %s to: %s\n", type.deco, t.deco, type.deco, t.deco); | |
| 474 //printf("%p %p %p\n", type.nextOf().arrayOf(), type, t); | |
| 475 fflush(stdout); | |
| 476 } | |
| 477 if (!t.deco) { | |
| 478 /* Can happen with: | |
| 479 * enum E { One } | |
| 480 * class A | |
| 481 * { static void fork(EDG dg) { dg(E.One); } | |
| 482 * alias void delegate(E) EDG; | |
| 483 * } | |
| 484 * Should eventually make it work. | |
| 485 */ | |
| 486 error("forward reference to type %s", t.toChars()); | |
| 487 } else if (t.reliesOnTident()) { | |
| 488 error("forward reference to type %s", t.reliesOnTident().toChars()); | |
| 489 } | |
| 490 | |
| 491 error("cannot implicitly convert expression (%s) of type %s to %s", toChars(), type.toChars(), t.toChars()); | |
| 492 return castTo(sc, t); | |
| 493 } | |
| 494 | |
| 495 /******************************************* | |
| 496 * Return !=0 if we can implicitly convert this to type t. | |
| 497 * Don't do the actual cast. | |
| 498 */ | |
| 499 MATCH implicitConvTo(Type t) | |
| 500 { | |
| 501 static if (false) { | |
| 502 printf("Expression.implicitConvTo(this=%s, type=%s, t=%s)\n", | |
| 503 toChars(), type.toChars(), t.toChars()); | |
| 504 } | |
| 505 //static int nest; if (++nest == 10) halt(); | |
| 506 if (!type) | |
| 507 { | |
| 508 error("%s is not an expression", toChars()); | |
| 509 type = Type.terror; | |
| 510 } | |
| 511 Expression e = optimize(WANT.WANTvalue | WANT.WANTflags); | |
| 512 if (e.type == t) | |
| 513 return MATCH.MATCHexact; | |
| 514 if (e != this) | |
| 515 { | |
| 516 //printf("\toptimized to %s of type %s\n", e.toChars(), e.type.toChars()); | |
| 517 return e.implicitConvTo(t); | |
| 518 } | |
| 519 MATCH match = type.implicitConvTo(t); | |
| 520 if (match != MATCH.MATCHnomatch) | |
| 521 return match; | |
| 522 | |
| 523 /* See if we can do integral narrowing conversions | |
| 524 */ | |
| 525 if (type.isintegral() && t.isintegral() && | |
| 526 type.isTypeBasic() && t.isTypeBasic()) | |
| 527 { | |
| 528 IntRange ir = getIntRange(); | |
| 529 if (ir.imax <= t.sizemask()) | |
| 530 return MATCH.MATCHconvert; | |
| 531 } | |
| 532 | |
| 533 static if (false) { | |
| 534 Type tb = t.toBasetype(); | |
| 535 if (tb.ty == Tdelegate) | |
| 536 { | |
| 537 TypeDelegate td = cast(TypeDelegate)tb; | |
| 538 TypeFunction tf = cast(TypeFunction)td.nextOf(); | |
| 539 | |
| 540 if (!tf.varargs && !(tf.arguments && tf.arguments.dim)) | |
| 541 { | |
| 542 match = type.implicitConvTo(tf.nextOf()); | |
| 543 if (match) | |
| 544 return match; | |
| 545 if (tf.nextOf().toBasetype().ty == Tvoid) | |
| 546 return MATCH.MATCHconvert; | |
| 547 } | |
| 548 } | |
| 549 } | |
| 550 return MATCH.MATCHnomatch; | |
| 551 } | |
| 552 | |
| 553 IntRange getIntRange() | |
| 554 { | |
| 53 | 555 IntRange ir; |
| 556 ir.imin = 0; | |
| 73 | 557 if (type.isintegral()) |
| 558 ir.imax = type.sizemask(); | |
| 559 else | |
| 560 ir.imax = 0xFFFFFFFFFFFFFFFFUL; // assume the worst | |
| 561 | |
| 53 | 562 return ir; |
| 0 | 563 } |
| 564 | |
| 565 /************************************** | |
| 566 * Do an explicit cast. | |
| 567 */ | |
| 568 Expression castTo(Scope sc, Type t) | |
| 569 { | |
| 570 //printf("Expression.castTo(this=%s, t=%s)\n", toChars(), t.toChars()); | |
| 571 static if (false) { | |
| 572 writef("Expression.castTo(this=%s, type=%s, t=%s)\n", | |
| 573 toChars(), type.toChars(), t.toChars()); | |
| 574 } | |
| 575 if (type is t) | |
| 576 return this; | |
| 577 Expression e = this; | |
| 578 Type tb = t.toBasetype(); | |
| 579 Type typeb = type.toBasetype(); | |
| 580 if (tb != typeb) | |
| 581 { | |
| 582 // Do (type *) cast of (type [dim]) | |
| 583 if (tb.ty == TY.Tpointer && typeb.ty == TY.Tsarray | |
| 584 ) | |
| 585 { | |
| 586 //printf("Converting [dim] to *\n"); | |
| 587 | |
| 588 if (typeb.size(loc) == 0) | |
| 589 e = new NullExp(loc); | |
| 590 else | |
| 591 e = new AddrExp(loc, e); | |
| 592 } | |
| 593 else { | |
| 594 static if (false) { | |
| 595 if (tb.ty == Tdelegate && type.ty != Tdelegate) | |
| 596 { | |
| 597 TypeDelegate td = cast(TypeDelegate)tb; | |
| 598 TypeFunction tf = cast(TypeFunction)td.nextOf(); | |
| 599 return toDelegate(sc, tf.nextOf()); | |
| 600 } | |
| 601 } | |
| 602 if (typeb.ty == TY.Tstruct) | |
| 603 { | |
| 604 TypeStruct ts = cast(TypeStruct)typeb; | |
| 605 if (!(tb.ty == TY.Tstruct && ts.sym == (cast(TypeStruct)tb).sym) && | |
| 606 ts.sym.aliasthis) | |
| 607 { /* Forward the cast to our alias this member, rewrite to: | |
| 608 * cast(to)e1.aliasthis | |
| 609 */ | |
| 610 Expression e1 = new DotIdExp(loc, this, ts.sym.aliasthis.ident); | |
| 611 Expression e2 = new CastExp(loc, e1, tb); | |
| 612 e2 = e2.semantic(sc); | |
| 613 return e2; | |
| 614 } | |
| 615 } | |
| 616 else if (typeb.ty == TY.Tclass) | |
| 617 { | |
| 618 TypeClass ts = cast(TypeClass)typeb; | |
| 619 if (tb.ty != TY.Tclass && ts.sym.aliasthis) | |
| 620 { /* Forward the cast to our alias this member, rewrite to: | |
| 621 * cast(to)e1.aliasthis | |
| 622 */ | |
| 623 Expression e1 = new DotIdExp(loc, this, ts.sym.aliasthis.ident); | |
| 624 Expression e2 = new CastExp(loc, e1, tb); | |
| 625 e2 = e2.semantic(sc); | |
| 626 return e2; | |
| 627 } | |
| 628 } | |
| 629 e = new CastExp(loc, e, tb); | |
| 630 } | |
| 631 } | |
| 632 else | |
| 633 { | |
| 634 e = e.copy(); // because of COW for assignment to e.type | |
| 635 } | |
| 636 | |
| 637 assert(e != this); | |
| 638 e.type = t; | |
| 639 //printf("Returning: %s\n", e.toChars()); | |
| 640 return e; | |
| 641 } | |
| 642 | |
| 643 /************************************ | |
| 644 * Detect cases where pointers to the stack can 'escape' the | |
| 645 * lifetime of the stack frame. | |
| 646 */ | |
| 647 void checkEscape() | |
| 648 { | |
| 649 } | |
| 650 | |
| 135 | 651 void checkEscapeRef() |
| 652 { | |
| 653 } | |
| 654 | |
| 0 | 655 void checkScalar() |
| 656 { | |
| 657 if (!type.isscalar()) | |
| 658 error("'%s' is not a scalar, it is a %s", toChars(), type.toChars()); | |
| 659 | |
| 660 rvalue(); | |
| 661 } | |
| 662 | |
| 663 void checkNoBool() | |
| 664 { | |
| 665 if (type.toBasetype().ty == TY.Tbool) | |
| 666 error("operation not allowed on bool '%s'", toChars()); | |
| 667 } | |
| 668 | |
| 669 Expression checkIntegral() | |
| 670 { | |
| 671 if (!type.isintegral()) | |
| 672 { | |
| 673 error("'%s' is not of integral type, it is a %s", toChars(), type.toChars()); | |
| 674 return new ErrorExp(); | |
| 675 } | |
| 676 | |
| 677 rvalue(); | |
| 678 return this; | |
| 679 } | |
| 680 | |
| 681 Expression checkArithmetic() | |
| 682 { | |
| 683 if (!type.isintegral() && !type.isfloating()) | |
| 684 { | |
| 685 error("'%s' is not of arithmetic type, it is a %s", toChars(), type.toChars()); | |
| 686 return new ErrorExp(); | |
| 687 } | |
| 688 | |
| 689 rvalue(); | |
| 690 return this; | |
| 691 } | |
| 692 | |
| 693 void checkDeprecated(Scope sc, Dsymbol s) | |
| 694 { | |
| 695 s.checkDeprecated(loc, sc); | |
| 696 } | |
| 697 | |
| 698 void checkPurity(Scope sc, FuncDeclaration f) | |
| 699 { | |
| 700 static if (true) { | |
| 701 if (sc.func) | |
| 702 { | |
|
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703 /* Given: |
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704 * void f() |
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705 * { pure void g() |
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706 * { |
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707 * void h() |
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708 * { |
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709 * void i() { } |
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710 * } |
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711 * } |
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712 * } |
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713 * g() can call h() but not f() |
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714 * i() can call h() and g() but not f() |
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715 */ |
| 0 | 716 FuncDeclaration outerfunc = sc.func; |
| 717 while (outerfunc.toParent2() && outerfunc.toParent2().isFuncDeclaration()) | |
| 718 { | |
| 719 outerfunc = outerfunc.toParent2().isFuncDeclaration(); | |
| 720 } | |
|
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721 if (outerfunc.isPure() && !sc.intypeof && (!f.isNested() && !f.isPure())) |
| 0 | 722 error("pure function '%s' cannot call impure function '%s'\n", |
| 723 sc.func.toChars(), f.toChars()); | |
| 724 } | |
| 725 } else { | |
| 726 if (sc.func && sc.func.isPure() && !sc.intypeof && !f.isPure()) | |
| 727 error("pure function '%s' cannot call impure function '%s'\n", | |
| 728 sc.func.toChars(), .toChars()); | |
| 729 } | |
| 730 } | |
|
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731 |
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732 void checkSafety(Scope sc, FuncDeclaration f) |
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733 { |
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734 if (sc.func && sc.func.isSafe() && !sc.intypeof && |
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735 !f.isSafe() && !f.isTrusted()) |
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736 error("safe function '%s' cannot call system function '%s'\n", |
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737 sc.func.toChars(), f.toChars()); |
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738 } |
| 0 | 739 |
| 740 /***************************** | |
| 741 * Check that expression can be tested for true or false. | |
| 742 */ | |
| 743 Expression checkToBoolean() | |
| 744 { | |
| 745 // Default is 'yes' - do nothing | |
| 746 | |
| 747 debug { | |
| 748 if (!type) | |
| 749 dump(0); | |
| 750 } | |
| 751 | |
| 752 if (!type.checkBoolean()) | |
| 753 { | |
| 754 error("expression %s of type %s does not have a boolean value", toChars(), type.toChars()); | |
| 755 } | |
| 756 | |
| 757 return this; | |
| 758 } | |
| 759 | |
| 760 Expression checkToPointer() | |
| 761 { | |
| 109 | 762 //writef("Expression::checkToPointer()\n"); |
| 763 Expression e = this; | |
| 0 | 764 |
| 109 | 765 version(SARRAYVALUE) {} else |
| 766 { | |
| 0 | 767 // If C static array, convert to pointer |
| 109 | 768 Type tb = type.toBasetype(); |
| 0 | 769 if (tb.ty == Tsarray) |
| 770 { | |
| 771 TypeSArray ts = cast(TypeSArray)tb; | |
| 772 if (ts.size(loc) == 0) | |
| 773 e = new NullExp(loc); | |
| 774 else | |
| 775 e = new AddrExp(loc, this); | |
| 776 e.type = ts.next.pointerTo(); | |
| 777 } | |
| 109 | 778 } |
| 0 | 779 return e; |
| 780 } | |
| 781 | |
| 782 Expression addressOf(Scope sc) | |
| 783 { | |
| 784 //printf("Expression::addressOf()\n"); | |
| 785 Expression e = toLvalue(sc, null); | |
| 786 e = new AddrExp(loc, e); | |
| 787 e.type = type.pointerTo(); | |
| 788 return e; | |
| 789 } | |
| 790 | |
| 791 /****************************** | |
| 792 * If this is a reference, dereference it. | |
| 793 */ | |
| 794 Expression deref() | |
| 795 { | |
| 796 //printf("Expression::deref()\n"); | |
| 73 | 797 // type could be null if forward referencing an 'auto' variable |
| 798 if (type && type.ty == Treference) | |
| 799 { | |
| 0 | 800 Expression e = new PtrExp(loc, this); |
| 801 e.type = (cast(TypeReference)type).next; | |
| 802 return e; | |
| 803 } | |
| 804 return this; | |
| 805 } | |
| 806 | |
| 807 /*********************************** | |
| 808 * Do integral promotions (convertchk). | |
| 809 * Don't convert <array of> to <pointer to> | |
| 810 */ | |
| 811 Expression integralPromotions(Scope sc) | |
| 812 { | |
| 813 Expression e = this; | |
| 814 | |
| 815 //printf("integralPromotions %s %s\n", e.toChars(), e.type.toChars()); | |
| 816 switch (type.toBasetype().ty) | |
| 817 { | |
| 818 case TY.Tvoid: | |
| 819 error("void has no value"); | |
| 820 break; | |
| 821 | |
| 822 case TY.Tint8: | |
| 823 case TY.Tuns8: | |
| 824 case TY.Tint16: | |
| 825 case TY.Tuns16: | |
| 826 case TY.Tbit: | |
| 827 case TY.Tbool: | |
| 828 case TY.Tchar: | |
| 829 case TY.Twchar: | |
| 830 e = e.castTo(sc, Type.tint32); | |
| 831 break; | |
| 832 | |
| 833 case TY.Tdchar: | |
| 834 e = e.castTo(sc, Type.tuns32); | |
| 835 break; | |
| 836 default: | |
| 837 break; /// | |
| 838 } | |
| 839 return e; | |
| 840 } | |
| 841 | |
| 55 | 842 /******************************************** |
| 843 * Convert from expression to delegate that returns the expression, | |
| 844 * i.e. convert: | |
| 845 * expr | |
| 846 * to: | |
| 847 * t delegate() { return expr; } | |
| 848 */ | |
| 0 | 849 Expression toDelegate(Scope sc, Type t) |
| 850 { | |
| 55 | 851 //printf("Expression.toDelegate(t = %s) %s\n", t.toChars(), toChars()); |
| 852 TypeFunction tf = new TypeFunction(null, t, 0, LINKd); | |
| 853 FuncLiteralDeclaration fld = new FuncLiteralDeclaration(loc, loc, tf, TOKdelegate, null); | |
| 854 Expression e; | |
| 855 static if (true) { | |
| 856 sc = sc.push(); | |
| 857 sc.parent = fld; // set current function to be the delegate | |
| 858 e = this; | |
| 859 e.scanForNestedRef(sc); | |
| 860 sc = sc.pop(); | |
| 861 } else { | |
| 862 e = this.syntaxCopy(); | |
| 863 } | |
| 864 Statement s = new ReturnStatement(loc, e); | |
| 865 fld.fbody = s; | |
| 866 e = new FuncExp(loc, fld); | |
| 867 e = e.semantic(sc); | |
| 868 return e; | |
| 0 | 869 } |
| 870 | |
| 871 void scanForNestedRef(Scope sc) | |
| 872 { | |
| 55 | 873 //printf("Expression.scanForNestedRef(%s)\n", toChars()); |
| 0 | 874 } |
| 875 | |
| 876 Expression optimize(int result) | |
| 877 { | |
| 878 //printf("Expression.optimize(result = x%x) %s\n", result, toChars()); | |
| 879 return this; | |
| 880 } | |
| 881 | |
|
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882 Expression interpret(InterState istate) |
| 0 | 883 { |
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884 version(LOG) |
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885 { |
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886 writef("Expression::interpret() %s\n", toChars()); |
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887 writef("type = %s\n", type.toChars()); |
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888 dump(0); |
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889 } |
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890 error("Cannot interpret %s at compile time", toChars()); |
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891 return EXP_CANT_INTERPRET; |
| 0 | 892 } |
| 893 | |
| 894 int isConst() | |
| 895 { | |
| 896 //printf("Expression::isConst(): %s\n", toChars()); | |
| 897 return 0; | |
| 898 } | |
| 899 | |
| 900 /******************************** | |
| 901 * Does this expression statically evaluate to a boolean TRUE or FALSE? | |
| 902 */ | |
| 903 bool isBool(bool result) | |
| 904 { | |
| 905 return false; | |
| 906 } | |
| 907 | |
| 141 | 908 /******************************** |
| 909 * Does this expression result in either a 1 or a 0? | |
| 910 */ | |
| 911 int isBit() | |
| 0 | 912 { |
| 141 | 913 return false; |
| 0 | 914 } |
| 915 | |
| 916 /******************************** | |
| 917 * Check for expressions that have no use. | |
| 918 * Input: | |
| 919 * flag 0 not going to use the result, so issue error message if no | |
| 920 * side effects | |
| 921 * 1 the result of the expression is used, but still check | |
| 922 * for useless subexpressions | |
| 923 * 2 do not issue error messages, just return !=0 if expression | |
| 924 * has side effects | |
| 925 */ | |
| 926 bool checkSideEffect(int flag) | |
| 927 { | |
| 928 if (flag == 0) | |
| 929 { | |
| 73 | 930 if (op == TOKerror) |
| 931 { | |
| 932 // Error should have already been printed | |
| 933 } | |
| 934 else if (op == TOKimport) | |
| 0 | 935 error("%s has no effect", toChars()); |
| 936 else | |
| 937 error("%s has no effect in expression (%s)", | |
| 938 | |
| 939 Token.toChars(op), toChars()); | |
| 940 } | |
| 941 | |
| 942 return false; | |
| 943 } | |
| 944 | |
| 945 bool canThrow() | |
| 946 { | |
| 947 version (DMDV2) { | |
| 948 return false; | |
| 949 } else { | |
| 950 return true; | |
| 951 } | |
| 952 } | |
| 953 | |
|
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954 /**************************************** |
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955 * Resolve __LINE__ and __FILE__ to loc. |
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956 */ |
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957 Expression resolveLoc(Loc loc, Scope sc) |
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958 { |
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959 return this; |
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960 } |
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961 |
| 0 | 962 int inlineCost(InlineCostState* ics) |
| 963 { | |
| 964 return 1; | |
| 965 } | |
| 966 | |
| 967 Expression doInline(InlineDoState ids) | |
| 968 { | |
| 969 //printf("Expression.doInline(%s): %s\n", Token.toChars(op), toChars()); | |
| 970 return copy(); | |
| 971 } | |
| 972 | |
| 973 Expression inlineScan(InlineScanState* iss) | |
| 974 { | |
| 975 return this; | |
| 976 } | |
| 977 | |
| 978 /*********************************** | |
| 979 * Determine if operands of binary op can be reversed | |
| 980 * to fit operator overload. | |
| 981 */ | |
| 982 | |
| 983 // For operator overloading | |
| 984 bool isCommutative() | |
| 985 { | |
| 986 return false; // default is no reverse | |
| 987 } | |
| 988 | |
| 989 /*********************************** | |
| 990 * Get Identifier for operator overload. | |
| 991 */ | |
| 992 Identifier opId() | |
| 993 { | |
| 994 assert(false); | |
| 995 } | |
| 996 | |
| 997 /*********************************** | |
| 998 * Get Identifier for reverse operator overload, | |
| 999 * null if not supported for this operator. | |
| 1000 */ | |
| 1001 Identifier opId_r() | |
| 1002 { | |
| 1003 return null; | |
| 1004 } | |
| 1005 | |
| 1006 // For array ops | |
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1007 /****************************************** |
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1008 * Construct the identifier for the array operation function, |
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1009 * and build the argument list to pass to it. |
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1010 */ |
| 0 | 1011 void buildArrayIdent(OutBuffer buf, Expressions arguments) |
| 1012 { | |
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1013 buf.writestring("Exp"); |
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1014 arguments.shift(this); |
| 0 | 1015 } |
| 1016 | |
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1017 Expression buildArrayLoop(Parameters fparams) |
| 0 | 1018 { |
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1019 Identifier id = Identifier.generateId("c", fparams.dim); |
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1020 auto param = new Parameter(STC.STCundefined, type, id, null); |
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1021 fparams.shift(param); |
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1022 Expression e = new IdentifierExp(Loc(0), id); |
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1023 return e; |
| 0 | 1024 } |
| 95 | 1025 |
| 1026 /*********************************************** | |
| 1027 * Test if operand is a valid array op operand. | |
| 1028 */ | |
| 1029 int isArrayOperand() | |
| 1030 { | |
| 1031 //writef("Expression::isArrayOperand() %s\n", toChars()); | |
| 1032 if (op == TOKslice) | |
| 1033 return 1; | |
| 1034 if (type.toBasetype().ty == TY.Tarray) | |
| 1035 { | |
| 1036 switch (op) | |
| 1037 { | |
| 1038 case TOKadd: | |
| 1039 case TOKmin: | |
| 1040 case TOKmul: | |
| 1041 case TOKdiv: | |
| 1042 case TOKmod: | |
| 1043 case TOKxor: | |
| 1044 case TOKand: | |
| 1045 case TOKor: | |
| 1046 case TOKneg: | |
| 1047 case TOKtilde: | |
| 1048 return 1; | |
| 1049 | |
| 1050 default: | |
| 1051 break; | |
| 1052 } | |
| 1053 } | |
| 1054 return 0; | |
| 1055 } | |
| 1056 | |
| 0 | 1057 // Back end |
| 1058 elem* toElem(IRState* irs) | |
| 1059 { | |
| 141 | 1060 print(); |
| 0 | 1061 assert(false); |
| 141 | 1062 return null; |
| 0 | 1063 } |
| 1064 | |
| 1065 dt_t** toDt(dt_t** pdt) | |
| 1066 { | |
| 141 | 1067 debug |
| 1068 { | |
| 1069 writef("Expression::toDt() %d\n", op); | |
| 1070 dump(0); | |
| 1071 } | |
| 1072 error("non-constant expression %s", toChars()); | |
| 1073 pdt = dtnzeros(pdt, 1); | |
| 1074 return pdt; | |
| 0 | 1075 } |
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1076 } |
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1077 |
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1078 alias Vector!Expression Expressions; |