Mercurial > projects > ddmd
annotate dmd/ReturnStatement.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 | a43c65469219 |
| rev | line source |
|---|---|
| 0 | 1 module dmd.ReturnStatement; |
| 2 | |
| 114 | 3 import dmd.common; |
| 0 | 4 import dmd.Loc; |
| 5 import dmd.Statement; | |
| 6 import dmd.GotoStatement; | |
| 7 import dmd.STC; | |
| 8 import dmd.CompoundStatement; | |
| 9 import dmd.Id; | |
| 10 import dmd.AssignExp; | |
| 11 import dmd.ExpStatement; | |
| 12 import dmd.FuncDeclaration; | |
| 13 import dmd.IntegerExp; | |
| 14 import dmd.ThisExp; | |
| 15 import dmd.StructDeclaration; | |
| 16 import dmd.TypeFunction; | |
| 17 import dmd.CSX; | |
| 18 import dmd.RET; | |
| 19 import dmd.TOK; | |
| 20 import dmd.Type; | |
| 21 import dmd.Expression; | |
| 22 import dmd.StructLiteralExp; | |
| 23 import dmd.TypeStruct; | |
| 24 import dmd.Scope; | |
| 25 import dmd.OutBuffer; | |
| 26 import dmd.HdrGenState; | |
| 27 import dmd.InterState; | |
| 28 import dmd.InlineCostState; | |
| 29 import dmd.InlineDoState; | |
| 30 import dmd.InlineScanState; | |
| 31 import dmd.IRState; | |
| 32 import dmd.TY; | |
| 33 import dmd.WANT; | |
| 34 import dmd.VarExp; | |
| 35 import dmd.VarDeclaration; | |
| 63 | 36 import dmd.GlobalExpressions; |
| 0 | 37 import dmd.BE; |
| 135 | 38 import dmd.Global; |
| 67 | 39 |
| 0 | 40 import dmd.codegen.Util; |
| 41 | |
| 42 import dmd.backend.Blockx; | |
| 43 import dmd.backend.elem; | |
| 44 import dmd.backend.TYM; | |
| 45 import dmd.backend.Util; | |
| 46 import dmd.backend.OPER; | |
| 47 import dmd.backend.mTY; | |
| 48 import dmd.backend.BC; | |
| 49 | |
| 67 | 50 import core.stdc.string; |
| 51 | |
| 0 | 52 class ReturnStatement : Statement |
| 53 { | |
| 54 Expression exp; | |
| 55 | |
| 56 this(Loc loc, Expression exp) | |
| 57 { | |
| 58 super(loc); | |
| 59 this.exp = exp; | |
| 60 } | |
| 61 | |
| 72 | 62 override Statement syntaxCopy() |
| 0 | 63 { |
| 64 Expression e = exp ? exp.syntaxCopy() : null; | |
| 65 return new ReturnStatement(loc, e); | |
| 66 } | |
| 67 | |
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68 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 69 { |
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70 buf.printf("return "); |
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71 if (exp) |
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72 exp.toCBuffer(buf, hgs); |
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73 buf.writeByte(';'); |
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74 buf.writenl(); |
| 0 | 75 } |
| 76 | |
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77 override Statement semantic(Scope sc) |
| 0 | 78 { |
| 79 //printf("ReturnStatement.semantic() %s\n", toChars()); | |
| 80 | |
| 81 FuncDeclaration fd = sc.parent.isFuncDeclaration(); | |
| 82 Scope scx = sc; | |
| 83 int implicit0 = 0; | |
| 84 | |
| 85 if (sc.fes) | |
| 86 { | |
| 87 // Find scope of function foreach is in | |
| 88 for (; 1; scx = scx.enclosing) | |
| 89 { | |
| 90 assert(scx); | |
| 91 if (scx.func !is fd) | |
| 92 { | |
| 93 fd = scx.func; // fd is now function enclosing foreach | |
| 94 break; | |
| 95 } | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 Type tret = fd.type.nextOf(); | |
| 100 if (fd.tintro) { | |
| 101 /* We'll be implicitly casting the return expression to tintro | |
| 102 */ | |
| 103 tret = fd.tintro.nextOf(); | |
| 104 } | |
| 105 | |
| 106 Type tbret = null; | |
| 107 | |
| 108 if (tret) { | |
| 109 tbret = tret.toBasetype(); | |
| 110 } | |
| 111 | |
| 112 // main() returns 0, even if it returns void | |
| 113 if (!exp && (!tbret || tbret.ty == TY.Tvoid) && fd.isMain()) | |
| 114 { | |
| 115 implicit0 = 1; | |
| 116 exp = new IntegerExp(0); | |
| 117 } | |
| 118 | |
| 119 if (sc.incontract || scx.incontract) | |
| 120 error("return statements cannot be in contracts"); | |
| 121 | |
| 122 if (sc.tf || scx.tf) | |
| 123 error("return statements cannot be in finally, scope(exit) or scope(success) bodies"); | |
| 124 | |
| 125 if (fd.isCtorDeclaration()) | |
| 126 { | |
| 127 // Constructors implicitly do: | |
| 128 // return this; | |
| 129 if (exp && exp.op != TOK.TOKthis) { | |
| 130 error("cannot return expression from constructor"); | |
| 131 } | |
| 132 | |
| 133 exp = new ThisExp(Loc(0)); | |
| 134 } | |
| 135 | |
| 136 if (!exp) { | |
| 137 fd.nrvo_can = 0; | |
| 138 } | |
| 139 | |
| 140 if (exp) | |
| 141 { | |
| 142 fd.hasReturnExp |= 1; | |
| 143 | |
| 144 exp = exp.semantic(sc); | |
| 145 exp = resolveProperties(sc, exp); | |
| 146 exp = exp.optimize(WANT.WANTvalue); | |
| 147 | |
| 148 if (fd.nrvo_can && exp.op == TOK.TOKvar) { | |
| 149 VarExp ve = cast(VarExp)exp; | |
| 150 VarDeclaration v = ve.var.isVarDeclaration(); | |
| 151 | |
| 152 if ((cast(TypeFunction)fd.type).isref) { | |
| 153 // Function returns a reference | |
| 154 fd.nrvo_can = 0; | |
| 155 } else if (!v || v.isOut() || v.isRef()) { | |
| 156 fd.nrvo_can = 0; | |
| 157 } else if (tbret.ty == TY.Tstruct && (cast(TypeStruct)tbret).sym.dtor) { | |
| 158 // Struct being returned has destructors | |
| 159 fd.nrvo_can = 0; | |
| 160 } else if (fd.nrvo_var is null) { | |
| 161 if (!v.isDataseg() && !v.isParameter() && v.toParent2() == fd) { | |
| 162 //printf("Setting nrvo to %s\n", v.toChars()); | |
| 163 fd.nrvo_var = v; | |
| 164 } else { | |
| 165 fd.nrvo_can = 0; | |
| 166 } | |
| 167 } else if (fd.nrvo_var != v) { | |
| 168 fd.nrvo_can = 0; | |
| 169 } | |
| 170 } else { | |
| 171 fd.nrvo_can = 0; | |
| 172 } | |
| 173 | |
| 174 if (fd.returnLabel && tbret.ty != TY.Tvoid) { | |
| 175 ; | |
| 176 } else if (fd.inferRetType) { | |
| 135 | 177 auto tf = cast(TypeFunction)fd.type; |
| 178 assert(tf.ty == TY.Tfunction); | |
| 179 Type tfret = tf.nextOf(); | |
| 180 if (tfret) | |
| 181 { | |
| 182 if (!exp.type.equals(tfret)) | |
| 183 error("mismatched function return type inference of %s and %s", exp.type.toChars(), tfret.toChars()); | |
| 184 /* The "refness" is determined by the first return statement, | |
| 185 * not all of them. This means: | |
| 186 * return 3; return x; // ok, x can be a value | |
| 187 * return x; return 3; // error, 3 is not an lvalue | |
| 188 */ | |
| 0 | 189 } |
| 190 else | |
| 191 { | |
| 135 | 192 if (tf.isref) |
| 193 { /* Determine "refness" of function return: | |
| 194 * if it's an lvalue, return by ref, else return by value | |
| 195 */ | |
| 196 if (exp.isLvalue()) | |
| 197 { | |
| 198 /* Return by ref | |
| 199 * (but first ensure it doesn't fail the "check for | |
| 200 * escaping reference" test) | |
| 201 */ | |
| 202 uint errors = global.errors; | |
| 203 global.gag++; | |
| 204 exp.checkEscapeRef(); | |
| 205 global.gag--; | |
| 206 if (errors != global.errors) | |
| 207 { tf.isref = false; // return by value | |
| 208 global.errors = errors; | |
| 209 } | |
| 210 } | |
| 211 else | |
| 212 tf.isref = false; // return by value | |
| 213 } | |
| 214 tf.next = exp.type; | |
| 215 fd.type = tf.semantic(loc, sc); | |
| 216 | |
| 0 | 217 if (!fd.tintro) |
| 218 { | |
| 219 tret = fd.type.nextOf(); | |
| 220 tbret = tret.toBasetype(); | |
| 221 } | |
| 222 } | |
| 223 } else if (tbret.ty != TY.Tvoid) | |
| 224 { | |
| 225 exp = exp.implicitCastTo(sc, tret); | |
| 226 exp = exp.optimize(WANT.WANTvalue); | |
| 227 } | |
| 228 } else if (fd.inferRetType) { | |
| 229 if (fd.type.nextOf()) | |
| 230 { | |
| 231 if (fd.type.nextOf().ty != TY.Tvoid) { | |
| 232 error("mismatched function return type inference of void and %s", fd.type.nextOf().toChars()); | |
| 233 } | |
| 234 } | |
| 235 else | |
| 236 { | |
| 237 (cast(TypeFunction*)fd.type).next = Type.tvoid; | |
| 238 fd.type = fd.type.semantic(loc, sc); | |
| 239 if (!fd.tintro) | |
| 240 { | |
| 241 tret = Type.tvoid; | |
| 242 tbret = tret; | |
| 243 } | |
| 244 } | |
| 245 } | |
| 246 else if (tbret.ty != TY.Tvoid) {// if non-void return | |
| 247 error("return expression expected"); | |
| 248 } | |
| 249 | |
| 250 if (sc.fes) | |
| 251 { | |
| 252 Statement s; | |
| 253 | |
| 254 if (exp && !implicit0) | |
| 255 { | |
| 256 exp = exp.implicitCastTo(sc, tret); | |
| 257 } | |
| 258 if (!exp || exp.op == TOK.TOKint64 || exp.op == TOK.TOKfloat64 || | |
| 259 exp.op == TOK.TOKimaginary80 || exp.op == TOK.TOKcomplex80 || | |
| 260 exp.op == TOK.TOKthis || exp.op == TOK.TOKsuper || exp.op == TOK.TOKnull || | |
| 261 exp.op == TOK.TOKstring) | |
| 262 { | |
| 263 sc.fes.cases.push(cast(void*)this); | |
| 264 // Construct: return cases.dim+1; | |
| 265 s = new ReturnStatement(Loc(0), new IntegerExp(sc.fes.cases.dim + 1)); | |
| 266 } | |
| 267 else if (fd.type.nextOf().toBasetype() == Type.tvoid) | |
| 268 { | |
| 269 s = new ReturnStatement(Loc(0), null); | |
| 270 sc.fes.cases.push(cast(void*)s); | |
| 271 | |
| 272 // Construct: { exp; return cases.dim + 1; } | |
| 273 Statement s1 = new ExpStatement(loc, exp); | |
| 274 Statement s2 = new ReturnStatement(Loc(0), new IntegerExp(sc.fes.cases.dim + 1)); | |
| 275 s = new CompoundStatement(loc, s1, s2); | |
| 276 } | |
| 277 else | |
| 278 { | |
| 279 // Construct: return vresult; | |
| 280 if (!fd.vresult) | |
| 281 { | |
| 282 // Declare vresult | |
| 283 VarDeclaration v = new VarDeclaration(loc, tret, Id.result, null); | |
| 284 v.noauto = true; | |
| 285 v.semantic(scx); | |
| 286 if (!scx.insert(v)) { | |
| 287 assert(0); | |
| 288 } | |
| 289 v.parent = fd; | |
| 290 fd.vresult = v; | |
| 291 } | |
| 292 | |
| 293 s = new ReturnStatement(Loc(0), new VarExp(Loc(0), fd.vresult)); | |
| 294 sc.fes.cases.push(cast(void*)s); | |
| 295 | |
| 296 // Construct: { vresult = exp; return cases.dim + 1; } | |
| 297 exp = new AssignExp(loc, new VarExp(Loc(0), fd.vresult), exp); | |
| 298 exp.op = TOK.TOKconstruct; | |
| 299 exp = exp.semantic(sc); | |
| 300 Statement s1 = new ExpStatement(loc, exp); | |
| 301 Statement s2 = new ReturnStatement(Loc(0), new IntegerExp(sc.fes.cases.dim + 1)); | |
| 302 s = new CompoundStatement(loc, s1, s2); | |
| 303 } | |
| 304 return s; | |
| 305 } | |
| 306 | |
| 307 if (exp) | |
| 308 { | |
| 309 if (fd.returnLabel && tbret.ty != TY.Tvoid) | |
| 310 { | |
| 311 assert(fd.vresult); | |
| 312 VarExp v = new VarExp(Loc(0), fd.vresult); | |
| 313 | |
| 314 exp = new AssignExp(loc, v, exp); | |
| 315 exp.op = TOK.TOKconstruct; | |
| 316 exp = exp.semantic(sc); | |
| 317 } | |
| 318 | |
| 319 if ((cast(TypeFunction)fd.type).isref && !fd.isCtorDeclaration()) | |
| 320 { // Function returns a reference | |
| 321 if (tbret.isMutable()) | |
| 322 exp = exp.modifiableLvalue(sc, exp); | |
| 323 else | |
| 324 exp = exp.toLvalue(sc, exp); | |
| 325 | |
| 135 | 326 exp.checkEscapeRef(); |
| 0 | 327 } |
| 135 | 328 else |
| 329 { | |
| 330 //exp.dump(0); | |
| 331 //exp.print(); | |
| 332 exp.checkEscape(); | |
| 333 } | |
| 0 | 334 } |
| 335 | |
| 336 /* BUG: need to issue an error on: | |
| 337 * this | |
| 338 * { if (x) return; | |
| 339 * super(); | |
| 340 * } | |
| 341 */ | |
| 342 | |
| 343 if (sc.callSuper & CSX.CSXany_ctor && !(sc.callSuper & (CSX.CSXthis_ctor | CSX.CSXsuper_ctor))) { | |
| 344 error("return without calling constructor"); | |
| 345 } | |
| 346 | |
| 347 sc.callSuper |= CSX.CSXreturn; | |
| 348 | |
| 349 // See if all returns are instead to be replaced with a goto returnLabel; | |
| 350 if (fd.returnLabel) | |
| 351 { | |
| 352 GotoStatement gs = new GotoStatement(loc, Id.returnLabel); | |
| 353 | |
| 354 gs.label = fd.returnLabel; | |
| 355 if (exp) | |
| 356 { | |
| 357 /* Replace: return exp; | |
| 358 * with: exp; goto returnLabel; | |
| 359 */ | |
| 360 Statement s = new ExpStatement(Loc(0), exp); | |
| 361 return new CompoundStatement(loc, s, gs); | |
| 362 } | |
| 363 return gs; | |
| 364 } | |
| 365 | |
| 73 | 366 if (exp && tbret.ty == Tvoid && !implicit0) |
| 0 | 367 { |
| 368 /* Replace: | |
| 369 * return exp; | |
| 370 * with: | |
| 371 * exp; return; | |
| 372 */ | |
| 373 Statement s = new ExpStatement(loc, exp); | |
| 79 | 374 exp = null; |
| 375 s = s.semantic(sc); | |
| 376 loc = Loc(); | |
| 0 | 377 return new CompoundStatement(loc, s, this); |
| 378 } | |
| 379 | |
| 380 return this; | |
| 381 } | |
| 382 | |
| 72 | 383 override BE blockExit() |
| 0 | 384 { |
| 385 BE result = BE.BEreturn; | |
| 386 if (exp && exp.canThrow()) | |
| 387 result |= BE.BEthrow; | |
| 388 | |
| 389 return result; | |
| 390 } | |
| 391 | |
| 72 | 392 override Expression interpret(InterState istate) |
| 0 | 393 { |
| 63 | 394 version (LOG) { |
| 395 printf("ReturnStatement.interpret(%s)\n", exp ? exp.toChars() : ""); | |
| 396 } | |
| 397 mixin(START!()); | |
| 398 if (!exp) | |
| 399 return EXP_VOID_INTERPRET; | |
| 400 version (LOG) { | |
| 401 Expression e = exp.interpret(istate); | |
| 402 printf("e = %p\n", e); | |
| 403 return e; | |
| 404 } else { | |
| 405 return exp.interpret(istate); | |
| 406 } | |
| 0 | 407 } |
| 408 | |
| 72 | 409 override int inlineCost(InlineCostState* ics) |
| 0 | 410 { |
| 411 // Can't handle return statements nested in if's | |
| 412 if (ics.nested) | |
| 413 return COST_MAX; | |
| 414 return exp ? exp.inlineCost(ics) : 0; | |
| 415 } | |
| 416 | |
| 72 | 417 override Expression doInline(InlineDoState ids) |
| 0 | 418 { |
| 419 //printf("ReturnStatement.doInline() '%s'\n", exp ? exp.toChars() : ""); | |
| 420 return exp ? exp.doInline(ids) : null; | |
| 421 } | |
| 422 | |
| 72 | 423 override Statement inlineScan(InlineScanState* iss) |
| 0 | 424 { |
| 425 //printf("ReturnStatement.inlineScan()\n"); | |
| 426 if (exp) | |
| 427 { | |
| 428 exp = exp.inlineScan(iss); | |
| 429 } | |
| 430 return this; | |
| 431 } | |
| 432 | |
| 72 | 433 override void toIR(IRState* irs) |
| 0 | 434 { |
| 435 Blockx* blx = irs.blx; | |
|
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436 |
| 0 | 437 incUsage(irs, loc); |
| 438 if (exp) | |
| 439 { | |
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440 //printf("%.*s %.*s\n", exp.classinfo.name, exp.toChars()); |
| 0 | 441 elem *e; |
| 442 | |
| 443 FuncDeclaration func = irs.getFunc(); | |
| 444 assert(func); | |
| 445 assert(func.type.ty == TY.Tfunction); | |
| 446 TypeFunction tf = cast(TypeFunction)(func.type); | |
| 447 | |
| 448 RET retmethod = tf.retStyle(); | |
| 449 if (retmethod == RET.RETstack) | |
| 450 { | |
| 451 elem* es; | |
| 452 | |
| 453 /* If returning struct literal, write result | |
| 454 * directly into return value | |
| 455 */ | |
| 456 if (exp.op == TOK.TOKstructliteral) | |
| 457 { | |
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458 StructLiteralExp se = cast(StructLiteralExp)exp; |
| 67 | 459 enum objectSize = __traits(classInstanceSize, StructLiteralExp); |
| 460 ubyte save[objectSize]; | |
| 461 memcpy(save.ptr, cast(void*)se, objectSize); | |
| 0 | 462 se.sym = irs.shidden; |
| 463 se.soffset = 0; | |
| 464 se.fillHoles = 1; | |
| 465 e = exp.toElem(irs); | |
| 67 | 466 memcpy(cast(void*)se, save.ptr, objectSize); |
| 0 | 467 } |
| 468 else | |
| 469 e = exp.toElem(irs); | |
| 470 | |
| 471 assert(e); | |
| 472 | |
| 473 if (exp.op == TOK.TOKstructliteral || (func.nrvo_can && func.nrvo_var)) | |
| 474 { | |
| 475 // Return value via hidden pointer passed as parameter | |
| 476 // Write exp; return shidden; | |
| 477 es = e; | |
| 478 } | |
| 479 else | |
| 480 { | |
| 481 // Return value via hidden pointer passed as parameter | |
| 482 // Write *shidden=exp; return shidden; | |
| 483 int op; | |
| 484 tym_t ety; | |
| 485 | |
| 486 ety = e.Ety; | |
| 487 es = el_una(OPER.OPind,ety,el_var(irs.shidden)); | |
| 488 op = (tybasic(ety) == TYM.TYstruct) ? OPER.OPstreq : OPER.OPeq; | |
| 489 es = el_bin(op, ety, es, e); | |
| 490 if (op == OPER.OPstreq) | |
| 491 es.Enumbytes = cast(uint)exp.type.size(); | |
| 492 version (DMDV2) { | |
| 493 /* Call postBlit() on *shidden | |
| 494 */ | |
| 495 Type tb = exp.type.toBasetype(); | |
| 496 //if (tb.ty == TY.Tstruct) exp.dump(0); | |
| 497 if ((exp.op == TOK.TOKvar || exp.op == TOK.TOKdotvar || exp.op == TOK.TOKstar) && | |
| 498 tb.ty == TY.Tstruct) | |
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499 { |
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500 StructDeclaration sd = (cast(TypeStruct)tb).sym; |
| 0 | 501 if (sd.postblit) |
| 502 { | |
| 503 FuncDeclaration fd = sd.postblit; | |
| 504 elem* ec = el_var(irs.shidden); | |
| 505 ec = callfunc(loc, irs, 1, Type.tvoid, ec, tb.pointerTo(), fd, fd.type, null, null); | |
| 506 es = el_bin(OPER.OPcomma, ec.Ety, es, ec); | |
| 507 } | |
| 508 | |
| 509 static if (false) { | |
| 510 /* It has been moved, so disable destructor | |
| 511 */ | |
| 512 if (exp.op == TOK.TOKvar) | |
| 513 { | |
| 514 VarExp ve = cast(VarExp)exp; | |
| 515 VarDeclaration v = ve.var.isVarDeclaration(); | |
| 516 if (v && v.rundtor) | |
| 517 { | |
| 518 elem* er = el_var(v.rundtor.toSymbol()); | |
| 519 er = el_bin(OPER.OPeq, TYM.TYint, er, el_long(TYM.TYint, 0)); | |
| 520 es = el_bin(OPER.OPcomma, TYM.TYint, es, er); | |
| 521 } | |
| 522 } | |
| 523 } | |
| 524 } | |
| 525 } | |
| 526 } | |
| 527 e = el_var(irs.shidden); | |
| 528 e = el_bin(OPER.OPcomma, e.Ety, es, e); | |
| 529 } | |
| 530 ///version (DMDV2) { | |
| 531 else if (tf.isref) | |
| 532 { // Reference return, so convert to a pointer | |
| 533 Expression ae = exp.addressOf(null); | |
| 534 e = ae.toElem(irs); | |
| 535 } | |
| 536 ///} | |
| 537 else | |
| 538 { | |
| 539 e = exp.toElem(irs); | |
| 540 assert(e); | |
| 541 } | |
| 542 | |
| 543 block_appendexp(blx.curblock, e); | |
| 544 block_next(blx, BC.BCretexp, null); | |
| 545 } | |
| 546 else | |
| 547 block_next(blx, BC.BCret, null); | |
| 548 } | |
| 549 | |
| 72 | 550 override ReturnStatement isReturnStatement() { return this; } |
| 551 } |