1 //===- TGParser.cpp - Parser for TableGen Files ---------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Implement the Parser for TableGen.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "TGParser.h"
15 #include "llvm/TableGen/Record.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include <algorithm>
18 #include <sstream>
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/Support/CommandLine.h"
21 using namespace llvm;
22
23 //===----------------------------------------------------------------------===//
24 // Support Code for the Semantic Actions.
25 //===----------------------------------------------------------------------===//
26
27 namespace llvm {
28 struct SubClassReference {
29 SMLoc RefLoc;
30 Record *Rec;
31 std::vector<Init*> TemplateArgs;
SubClassReferencellvm::SubClassReference32 SubClassReference() : Rec(0) {}
33
isInvalidllvm::SubClassReference34 bool isInvalid() const { return Rec == 0; }
35 };
36
37 struct SubMultiClassReference {
38 SMLoc RefLoc;
39 MultiClass *MC;
40 std::vector<Init*> TemplateArgs;
SubMultiClassReferencellvm::SubMultiClassReference41 SubMultiClassReference() : MC(0) {}
42
isInvalidllvm::SubMultiClassReference43 bool isInvalid() const { return MC == 0; }
44 void dump() const;
45 };
46
dump() const47 void SubMultiClassReference::dump() const {
48 errs() << "Multiclass:\n";
49
50 MC->dump();
51
52 errs() << "Template args:\n";
53 for (std::vector<Init *>::const_iterator i = TemplateArgs.begin(),
54 iend = TemplateArgs.end();
55 i != iend;
56 ++i) {
57 (*i)->dump();
58 }
59 }
60
61 } // end namespace llvm
62
AddValue(Record * CurRec,SMLoc Loc,const RecordVal & RV)63 bool TGParser::AddValue(Record *CurRec, SMLoc Loc, const RecordVal &RV) {
64 if (CurRec == 0)
65 CurRec = &CurMultiClass->Rec;
66
67 if (RecordVal *ERV = CurRec->getValue(RV.getName())) {
68 // The value already exists in the class, treat this as a set.
69 if (ERV->setValue(RV.getValue()))
70 return Error(Loc, "New definition of '" + RV.getName() + "' of type '" +
71 RV.getType()->getAsString() + "' is incompatible with " +
72 "previous definition of type '" +
73 ERV->getType()->getAsString() + "'");
74 } else {
75 CurRec->addValue(RV);
76 }
77 return false;
78 }
79
80 /// SetValue -
81 /// Return true on error, false on success.
SetValue(Record * CurRec,SMLoc Loc,const std::string & ValName,const std::vector<unsigned> & BitList,Init * V)82 bool TGParser::SetValue(Record *CurRec, SMLoc Loc, const std::string &ValName,
83 const std::vector<unsigned> &BitList, Init *V) {
84 if (!V) return false;
85
86 if (CurRec == 0) CurRec = &CurMultiClass->Rec;
87
88 RecordVal *RV = CurRec->getValue(ValName);
89 if (RV == 0)
90 return Error(Loc, "Value '" + ValName + "' unknown!");
91
92 // Do not allow assignments like 'X = X'. This will just cause infinite loops
93 // in the resolution machinery.
94 if (BitList.empty())
95 if (VarInit *VI = dynamic_cast<VarInit*>(V))
96 if (VI->getName() == ValName)
97 return false;
98
99 // If we are assigning to a subset of the bits in the value... then we must be
100 // assigning to a field of BitsRecTy, which must have a BitsInit
101 // initializer.
102 //
103 if (!BitList.empty()) {
104 BitsInit *CurVal = dynamic_cast<BitsInit*>(RV->getValue());
105 if (CurVal == 0)
106 return Error(Loc, "Value '" + ValName + "' is not a bits type");
107
108 // Convert the incoming value to a bits type of the appropriate size...
109 Init *BI = V->convertInitializerTo(BitsRecTy::get(BitList.size()));
110 if (BI == 0) {
111 V->convertInitializerTo(BitsRecTy::get(BitList.size()));
112 return Error(Loc, "Initializer is not compatible with bit range");
113 }
114
115 // We should have a BitsInit type now.
116 BitsInit *BInit = dynamic_cast<BitsInit*>(BI);
117 assert(BInit != 0);
118
119 SmallVector<Init *, 16> NewBits(CurVal->getNumBits());
120
121 // Loop over bits, assigning values as appropriate.
122 for (unsigned i = 0, e = BitList.size(); i != e; ++i) {
123 unsigned Bit = BitList[i];
124 if (NewBits[Bit])
125 return Error(Loc, "Cannot set bit #" + utostr(Bit) + " of value '" +
126 ValName + "' more than once");
127 NewBits[Bit] = BInit->getBit(i);
128 }
129
130 for (unsigned i = 0, e = CurVal->getNumBits(); i != e; ++i)
131 if (NewBits[i] == 0)
132 NewBits[i] = CurVal->getBit(i);
133
134 V = BitsInit::get(NewBits);
135 }
136
137 if (RV->setValue(V))
138 return Error(Loc, "Value '" + ValName + "' of type '" +
139 RV->getType()->getAsString() +
140 "' is incompatible with initializer '" + V->getAsString() +"'");
141 return false;
142 }
143
144 /// AddSubClass - Add SubClass as a subclass to CurRec, resolving its template
145 /// args as SubClass's template arguments.
AddSubClass(Record * CurRec,SubClassReference & SubClass)146 bool TGParser::AddSubClass(Record *CurRec, SubClassReference &SubClass) {
147 Record *SC = SubClass.Rec;
148 // Add all of the values in the subclass into the current class.
149 const std::vector<RecordVal> &Vals = SC->getValues();
150 for (unsigned i = 0, e = Vals.size(); i != e; ++i)
151 if (AddValue(CurRec, SubClass.RefLoc, Vals[i]))
152 return true;
153
154 const std::vector<std::string> &TArgs = SC->getTemplateArgs();
155
156 // Ensure that an appropriate number of template arguments are specified.
157 if (TArgs.size() < SubClass.TemplateArgs.size())
158 return Error(SubClass.RefLoc, "More template args specified than expected");
159
160 // Loop over all of the template arguments, setting them to the specified
161 // value or leaving them as the default if necessary.
162 for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
163 if (i < SubClass.TemplateArgs.size()) {
164 // If a value is specified for this template arg, set it now.
165 if (SetValue(CurRec, SubClass.RefLoc, TArgs[i], std::vector<unsigned>(),
166 SubClass.TemplateArgs[i]))
167 return true;
168
169 // Resolve it next.
170 CurRec->resolveReferencesTo(CurRec->getValue(TArgs[i]));
171
172 // Now remove it.
173 CurRec->removeValue(TArgs[i]);
174
175 } else if (!CurRec->getValue(TArgs[i])->getValue()->isComplete()) {
176 return Error(SubClass.RefLoc,"Value not specified for template argument #"
177 + utostr(i) + " (" + TArgs[i] + ") of subclass '" +
178 SC->getName() + "'!");
179 }
180 }
181
182 // Since everything went well, we can now set the "superclass" list for the
183 // current record.
184 const std::vector<Record*> &SCs = SC->getSuperClasses();
185 for (unsigned i = 0, e = SCs.size(); i != e; ++i) {
186 if (CurRec->isSubClassOf(SCs[i]))
187 return Error(SubClass.RefLoc,
188 "Already subclass of '" + SCs[i]->getName() + "'!\n");
189 CurRec->addSuperClass(SCs[i]);
190 }
191
192 if (CurRec->isSubClassOf(SC))
193 return Error(SubClass.RefLoc,
194 "Already subclass of '" + SC->getName() + "'!\n");
195 CurRec->addSuperClass(SC);
196 return false;
197 }
198
199 /// AddSubMultiClass - Add SubMultiClass as a subclass to
200 /// CurMC, resolving its template args as SubMultiClass's
201 /// template arguments.
AddSubMultiClass(MultiClass * CurMC,SubMultiClassReference & SubMultiClass)202 bool TGParser::AddSubMultiClass(MultiClass *CurMC,
203 SubMultiClassReference &SubMultiClass) {
204 MultiClass *SMC = SubMultiClass.MC;
205 Record *CurRec = &CurMC->Rec;
206
207 const std::vector<RecordVal> &MCVals = CurRec->getValues();
208
209 // Add all of the values in the subclass into the current class.
210 const std::vector<RecordVal> &SMCVals = SMC->Rec.getValues();
211 for (unsigned i = 0, e = SMCVals.size(); i != e; ++i)
212 if (AddValue(CurRec, SubMultiClass.RefLoc, SMCVals[i]))
213 return true;
214
215 int newDefStart = CurMC->DefPrototypes.size();
216
217 // Add all of the defs in the subclass into the current multiclass.
218 for (MultiClass::RecordVector::const_iterator i = SMC->DefPrototypes.begin(),
219 iend = SMC->DefPrototypes.end();
220 i != iend;
221 ++i) {
222 // Clone the def and add it to the current multiclass
223 Record *NewDef = new Record(**i);
224
225 // Add all of the values in the superclass into the current def.
226 for (unsigned i = 0, e = MCVals.size(); i != e; ++i)
227 if (AddValue(NewDef, SubMultiClass.RefLoc, MCVals[i]))
228 return true;
229
230 CurMC->DefPrototypes.push_back(NewDef);
231 }
232
233 const std::vector<std::string> &SMCTArgs = SMC->Rec.getTemplateArgs();
234
235 // Ensure that an appropriate number of template arguments are
236 // specified.
237 if (SMCTArgs.size() < SubMultiClass.TemplateArgs.size())
238 return Error(SubMultiClass.RefLoc,
239 "More template args specified than expected");
240
241 // Loop over all of the template arguments, setting them to the specified
242 // value or leaving them as the default if necessary.
243 for (unsigned i = 0, e = SMCTArgs.size(); i != e; ++i) {
244 if (i < SubMultiClass.TemplateArgs.size()) {
245 // If a value is specified for this template arg, set it in the
246 // superclass now.
247 if (SetValue(CurRec, SubMultiClass.RefLoc, SMCTArgs[i],
248 std::vector<unsigned>(),
249 SubMultiClass.TemplateArgs[i]))
250 return true;
251
252 // Resolve it next.
253 CurRec->resolveReferencesTo(CurRec->getValue(SMCTArgs[i]));
254
255 // Now remove it.
256 CurRec->removeValue(SMCTArgs[i]);
257
258 // If a value is specified for this template arg, set it in the
259 // new defs now.
260 for (MultiClass::RecordVector::iterator j =
261 CurMC->DefPrototypes.begin() + newDefStart,
262 jend = CurMC->DefPrototypes.end();
263 j != jend;
264 ++j) {
265 Record *Def = *j;
266
267 if (SetValue(Def, SubMultiClass.RefLoc, SMCTArgs[i],
268 std::vector<unsigned>(),
269 SubMultiClass.TemplateArgs[i]))
270 return true;
271
272 // Resolve it next.
273 Def->resolveReferencesTo(Def->getValue(SMCTArgs[i]));
274
275 // Now remove it
276 Def->removeValue(SMCTArgs[i]);
277 }
278 } else if (!CurRec->getValue(SMCTArgs[i])->getValue()->isComplete()) {
279 return Error(SubMultiClass.RefLoc,
280 "Value not specified for template argument #"
281 + utostr(i) + " (" + SMCTArgs[i] + ") of subclass '" +
282 SMC->Rec.getName() + "'!");
283 }
284 }
285
286 return false;
287 }
288
289 //===----------------------------------------------------------------------===//
290 // Parser Code
291 //===----------------------------------------------------------------------===//
292
293 /// isObjectStart - Return true if this is a valid first token for an Object.
isObjectStart(tgtok::TokKind K)294 static bool isObjectStart(tgtok::TokKind K) {
295 return K == tgtok::Class || K == tgtok::Def ||
296 K == tgtok::Defm || K == tgtok::Let || K == tgtok::MultiClass;
297 }
298
GetNewAnonymousName()299 static std::string GetNewAnonymousName() {
300 static unsigned AnonCounter = 0;
301 return "anonymous."+utostr(AnonCounter++);
302 }
303
304 /// ParseObjectName - If an object name is specified, return it. Otherwise,
305 /// return an anonymous name.
306 /// ObjectName ::= ID
307 /// ObjectName ::= /*empty*/
308 ///
ParseObjectName()309 std::string TGParser::ParseObjectName() {
310 if (Lex.getCode() != tgtok::Id)
311 return GetNewAnonymousName();
312
313 std::string Ret = Lex.getCurStrVal();
314 Lex.Lex();
315 return Ret;
316 }
317
318
319 /// ParseClassID - Parse and resolve a reference to a class name. This returns
320 /// null on error.
321 ///
322 /// ClassID ::= ID
323 ///
ParseClassID()324 Record *TGParser::ParseClassID() {
325 if (Lex.getCode() != tgtok::Id) {
326 TokError("expected name for ClassID");
327 return 0;
328 }
329
330 Record *Result = Records.getClass(Lex.getCurStrVal());
331 if (Result == 0)
332 TokError("Couldn't find class '" + Lex.getCurStrVal() + "'");
333
334 Lex.Lex();
335 return Result;
336 }
337
338 /// ParseMultiClassID - Parse and resolve a reference to a multiclass name.
339 /// This returns null on error.
340 ///
341 /// MultiClassID ::= ID
342 ///
ParseMultiClassID()343 MultiClass *TGParser::ParseMultiClassID() {
344 if (Lex.getCode() != tgtok::Id) {
345 TokError("expected name for ClassID");
346 return 0;
347 }
348
349 MultiClass *Result = MultiClasses[Lex.getCurStrVal()];
350 if (Result == 0)
351 TokError("Couldn't find class '" + Lex.getCurStrVal() + "'");
352
353 Lex.Lex();
354 return Result;
355 }
356
ParseDefmID()357 Record *TGParser::ParseDefmID() {
358 if (Lex.getCode() != tgtok::Id) {
359 TokError("expected multiclass name");
360 return 0;
361 }
362
363 MultiClass *MC = MultiClasses[Lex.getCurStrVal()];
364 if (MC == 0) {
365 TokError("Couldn't find multiclass '" + Lex.getCurStrVal() + "'");
366 return 0;
367 }
368
369 Lex.Lex();
370 return &MC->Rec;
371 }
372
373
374 /// ParseSubClassReference - Parse a reference to a subclass or to a templated
375 /// subclass. This returns a SubClassRefTy with a null Record* on error.
376 ///
377 /// SubClassRef ::= ClassID
378 /// SubClassRef ::= ClassID '<' ValueList '>'
379 ///
380 SubClassReference TGParser::
ParseSubClassReference(Record * CurRec,bool isDefm)381 ParseSubClassReference(Record *CurRec, bool isDefm) {
382 SubClassReference Result;
383 Result.RefLoc = Lex.getLoc();
384
385 if (isDefm)
386 Result.Rec = ParseDefmID();
387 else
388 Result.Rec = ParseClassID();
389 if (Result.Rec == 0) return Result;
390
391 // If there is no template arg list, we're done.
392 if (Lex.getCode() != tgtok::less)
393 return Result;
394 Lex.Lex(); // Eat the '<'
395
396 if (Lex.getCode() == tgtok::greater) {
397 TokError("subclass reference requires a non-empty list of template values");
398 Result.Rec = 0;
399 return Result;
400 }
401
402 Result.TemplateArgs = ParseValueList(CurRec, Result.Rec);
403 if (Result.TemplateArgs.empty()) {
404 Result.Rec = 0; // Error parsing value list.
405 return Result;
406 }
407
408 if (Lex.getCode() != tgtok::greater) {
409 TokError("expected '>' in template value list");
410 Result.Rec = 0;
411 return Result;
412 }
413 Lex.Lex();
414
415 return Result;
416 }
417
418 /// ParseSubMultiClassReference - Parse a reference to a subclass or to a
419 /// templated submulticlass. This returns a SubMultiClassRefTy with a null
420 /// Record* on error.
421 ///
422 /// SubMultiClassRef ::= MultiClassID
423 /// SubMultiClassRef ::= MultiClassID '<' ValueList '>'
424 ///
425 SubMultiClassReference TGParser::
ParseSubMultiClassReference(MultiClass * CurMC)426 ParseSubMultiClassReference(MultiClass *CurMC) {
427 SubMultiClassReference Result;
428 Result.RefLoc = Lex.getLoc();
429
430 Result.MC = ParseMultiClassID();
431 if (Result.MC == 0) return Result;
432
433 // If there is no template arg list, we're done.
434 if (Lex.getCode() != tgtok::less)
435 return Result;
436 Lex.Lex(); // Eat the '<'
437
438 if (Lex.getCode() == tgtok::greater) {
439 TokError("subclass reference requires a non-empty list of template values");
440 Result.MC = 0;
441 return Result;
442 }
443
444 Result.TemplateArgs = ParseValueList(&CurMC->Rec, &Result.MC->Rec);
445 if (Result.TemplateArgs.empty()) {
446 Result.MC = 0; // Error parsing value list.
447 return Result;
448 }
449
450 if (Lex.getCode() != tgtok::greater) {
451 TokError("expected '>' in template value list");
452 Result.MC = 0;
453 return Result;
454 }
455 Lex.Lex();
456
457 return Result;
458 }
459
460 /// ParseRangePiece - Parse a bit/value range.
461 /// RangePiece ::= INTVAL
462 /// RangePiece ::= INTVAL '-' INTVAL
463 /// RangePiece ::= INTVAL INTVAL
ParseRangePiece(std::vector<unsigned> & Ranges)464 bool TGParser::ParseRangePiece(std::vector<unsigned> &Ranges) {
465 if (Lex.getCode() != tgtok::IntVal) {
466 TokError("expected integer or bitrange");
467 return true;
468 }
469 int64_t Start = Lex.getCurIntVal();
470 int64_t End;
471
472 if (Start < 0)
473 return TokError("invalid range, cannot be negative");
474
475 switch (Lex.Lex()) { // eat first character.
476 default:
477 Ranges.push_back(Start);
478 return false;
479 case tgtok::minus:
480 if (Lex.Lex() != tgtok::IntVal) {
481 TokError("expected integer value as end of range");
482 return true;
483 }
484 End = Lex.getCurIntVal();
485 break;
486 case tgtok::IntVal:
487 End = -Lex.getCurIntVal();
488 break;
489 }
490 if (End < 0)
491 return TokError("invalid range, cannot be negative");
492 Lex.Lex();
493
494 // Add to the range.
495 if (Start < End) {
496 for (; Start <= End; ++Start)
497 Ranges.push_back(Start);
498 } else {
499 for (; Start >= End; --Start)
500 Ranges.push_back(Start);
501 }
502 return false;
503 }
504
505 /// ParseRangeList - Parse a list of scalars and ranges into scalar values.
506 ///
507 /// RangeList ::= RangePiece (',' RangePiece)*
508 ///
ParseRangeList()509 std::vector<unsigned> TGParser::ParseRangeList() {
510 std::vector<unsigned> Result;
511
512 // Parse the first piece.
513 if (ParseRangePiece(Result))
514 return std::vector<unsigned>();
515 while (Lex.getCode() == tgtok::comma) {
516 Lex.Lex(); // Eat the comma.
517
518 // Parse the next range piece.
519 if (ParseRangePiece(Result))
520 return std::vector<unsigned>();
521 }
522 return Result;
523 }
524
525 /// ParseOptionalRangeList - Parse either a range list in <>'s or nothing.
526 /// OptionalRangeList ::= '<' RangeList '>'
527 /// OptionalRangeList ::= /*empty*/
ParseOptionalRangeList(std::vector<unsigned> & Ranges)528 bool TGParser::ParseOptionalRangeList(std::vector<unsigned> &Ranges) {
529 if (Lex.getCode() != tgtok::less)
530 return false;
531
532 SMLoc StartLoc = Lex.getLoc();
533 Lex.Lex(); // eat the '<'
534
535 // Parse the range list.
536 Ranges = ParseRangeList();
537 if (Ranges.empty()) return true;
538
539 if (Lex.getCode() != tgtok::greater) {
540 TokError("expected '>' at end of range list");
541 return Error(StartLoc, "to match this '<'");
542 }
543 Lex.Lex(); // eat the '>'.
544 return false;
545 }
546
547 /// ParseOptionalBitList - Parse either a bit list in {}'s or nothing.
548 /// OptionalBitList ::= '{' RangeList '}'
549 /// OptionalBitList ::= /*empty*/
ParseOptionalBitList(std::vector<unsigned> & Ranges)550 bool TGParser::ParseOptionalBitList(std::vector<unsigned> &Ranges) {
551 if (Lex.getCode() != tgtok::l_brace)
552 return false;
553
554 SMLoc StartLoc = Lex.getLoc();
555 Lex.Lex(); // eat the '{'
556
557 // Parse the range list.
558 Ranges = ParseRangeList();
559 if (Ranges.empty()) return true;
560
561 if (Lex.getCode() != tgtok::r_brace) {
562 TokError("expected '}' at end of bit list");
563 return Error(StartLoc, "to match this '{'");
564 }
565 Lex.Lex(); // eat the '}'.
566 return false;
567 }
568
569
570 /// ParseType - Parse and return a tblgen type. This returns null on error.
571 ///
572 /// Type ::= STRING // string type
573 /// Type ::= BIT // bit type
574 /// Type ::= BITS '<' INTVAL '>' // bits<x> type
575 /// Type ::= INT // int type
576 /// Type ::= LIST '<' Type '>' // list<x> type
577 /// Type ::= CODE // code type
578 /// Type ::= DAG // dag type
579 /// Type ::= ClassID // Record Type
580 ///
ParseType()581 RecTy *TGParser::ParseType() {
582 switch (Lex.getCode()) {
583 default: TokError("Unknown token when expecting a type"); return 0;
584 case tgtok::String: Lex.Lex(); return StringRecTy::get();
585 case tgtok::Bit: Lex.Lex(); return BitRecTy::get();
586 case tgtok::Int: Lex.Lex(); return IntRecTy::get();
587 case tgtok::Code: Lex.Lex(); return CodeRecTy::get();
588 case tgtok::Dag: Lex.Lex(); return DagRecTy::get();
589 case tgtok::Id:
590 if (Record *R = ParseClassID()) return RecordRecTy::get(R);
591 return 0;
592 case tgtok::Bits: {
593 if (Lex.Lex() != tgtok::less) { // Eat 'bits'
594 TokError("expected '<' after bits type");
595 return 0;
596 }
597 if (Lex.Lex() != tgtok::IntVal) { // Eat '<'
598 TokError("expected integer in bits<n> type");
599 return 0;
600 }
601 uint64_t Val = Lex.getCurIntVal();
602 if (Lex.Lex() != tgtok::greater) { // Eat count.
603 TokError("expected '>' at end of bits<n> type");
604 return 0;
605 }
606 Lex.Lex(); // Eat '>'
607 return BitsRecTy::get(Val);
608 }
609 case tgtok::List: {
610 if (Lex.Lex() != tgtok::less) { // Eat 'bits'
611 TokError("expected '<' after list type");
612 return 0;
613 }
614 Lex.Lex(); // Eat '<'
615 RecTy *SubType = ParseType();
616 if (SubType == 0) return 0;
617
618 if (Lex.getCode() != tgtok::greater) {
619 TokError("expected '>' at end of list<ty> type");
620 return 0;
621 }
622 Lex.Lex(); // Eat '>'
623 return ListRecTy::get(SubType);
624 }
625 }
626 }
627
628 /// ParseIDValue - Parse an ID as a value and decode what it means.
629 ///
630 /// IDValue ::= ID [def local value]
631 /// IDValue ::= ID [def template arg]
632 /// IDValue ::= ID [multiclass local value]
633 /// IDValue ::= ID [multiclass template argument]
634 /// IDValue ::= ID [def name]
635 ///
ParseIDValue(Record * CurRec)636 Init *TGParser::ParseIDValue(Record *CurRec) {
637 assert(Lex.getCode() == tgtok::Id && "Expected ID in ParseIDValue");
638 std::string Name = Lex.getCurStrVal();
639 SMLoc Loc = Lex.getLoc();
640 Lex.Lex();
641 return ParseIDValue(CurRec, Name, Loc);
642 }
643
644 /// ParseIDValue - This is just like ParseIDValue above, but it assumes the ID
645 /// has already been read.
ParseIDValue(Record * CurRec,const std::string & Name,SMLoc NameLoc)646 Init *TGParser::ParseIDValue(Record *CurRec,
647 const std::string &Name, SMLoc NameLoc) {
648 if (CurRec) {
649 if (const RecordVal *RV = CurRec->getValue(Name))
650 return VarInit::get(Name, RV->getType());
651
652 std::string TemplateArgName = CurRec->getName()+":"+Name;
653 if (CurMultiClass)
654 TemplateArgName = CurMultiClass->Rec.getName()+"::"+TemplateArgName;
655
656 if (CurRec->isTemplateArg(TemplateArgName)) {
657 const RecordVal *RV = CurRec->getValue(TemplateArgName);
658 assert(RV && "Template arg doesn't exist??");
659 return VarInit::get(TemplateArgName, RV->getType());
660 }
661 }
662
663 if (CurMultiClass) {
664 std::string MCName = CurMultiClass->Rec.getName()+"::"+Name;
665 if (CurMultiClass->Rec.isTemplateArg(MCName)) {
666 const RecordVal *RV = CurMultiClass->Rec.getValue(MCName);
667 assert(RV && "Template arg doesn't exist??");
668 return VarInit::get(MCName, RV->getType());
669 }
670 }
671
672 if (Record *D = Records.getDef(Name))
673 return DefInit::get(D);
674
675 Error(NameLoc, "Variable not defined: '" + Name + "'");
676 return 0;
677 }
678
679 /// ParseOperation - Parse an operator. This returns null on error.
680 ///
681 /// Operation ::= XOperator ['<' Type '>'] '(' Args ')'
682 ///
ParseOperation(Record * CurRec)683 Init *TGParser::ParseOperation(Record *CurRec) {
684 switch (Lex.getCode()) {
685 default:
686 TokError("unknown operation");
687 return 0;
688 break;
689 case tgtok::XHead:
690 case tgtok::XTail:
691 case tgtok::XEmpty:
692 case tgtok::XCast: { // Value ::= !unop '(' Value ')'
693 UnOpInit::UnaryOp Code;
694 RecTy *Type = 0;
695
696 switch (Lex.getCode()) {
697 default: assert(0 && "Unhandled code!");
698 case tgtok::XCast:
699 Lex.Lex(); // eat the operation
700 Code = UnOpInit::CAST;
701
702 Type = ParseOperatorType();
703
704 if (Type == 0) {
705 TokError("did not get type for unary operator");
706 return 0;
707 }
708
709 break;
710 case tgtok::XHead:
711 Lex.Lex(); // eat the operation
712 Code = UnOpInit::HEAD;
713 break;
714 case tgtok::XTail:
715 Lex.Lex(); // eat the operation
716 Code = UnOpInit::TAIL;
717 break;
718 case tgtok::XEmpty:
719 Lex.Lex(); // eat the operation
720 Code = UnOpInit::EMPTY;
721 Type = IntRecTy::get();
722 break;
723 }
724 if (Lex.getCode() != tgtok::l_paren) {
725 TokError("expected '(' after unary operator");
726 return 0;
727 }
728 Lex.Lex(); // eat the '('
729
730 Init *LHS = ParseValue(CurRec);
731 if (LHS == 0) return 0;
732
733 if (Code == UnOpInit::HEAD
734 || Code == UnOpInit::TAIL
735 || Code == UnOpInit::EMPTY) {
736 ListInit *LHSl = dynamic_cast<ListInit*>(LHS);
737 StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
738 TypedInit *LHSt = dynamic_cast<TypedInit*>(LHS);
739 if (LHSl == 0 && LHSs == 0 && LHSt == 0) {
740 TokError("expected list or string type argument in unary operator");
741 return 0;
742 }
743 if (LHSt) {
744 ListRecTy *LType = dynamic_cast<ListRecTy*>(LHSt->getType());
745 StringRecTy *SType = dynamic_cast<StringRecTy*>(LHSt->getType());
746 if (LType == 0 && SType == 0) {
747 TokError("expected list or string type argumnet in unary operator");
748 return 0;
749 }
750 }
751
752 if (Code == UnOpInit::HEAD
753 || Code == UnOpInit::TAIL) {
754 if (LHSl == 0 && LHSt == 0) {
755 TokError("expected list type argumnet in unary operator");
756 return 0;
757 }
758
759 if (LHSl && LHSl->getSize() == 0) {
760 TokError("empty list argument in unary operator");
761 return 0;
762 }
763 if (LHSl) {
764 Init *Item = LHSl->getElement(0);
765 TypedInit *Itemt = dynamic_cast<TypedInit*>(Item);
766 if (Itemt == 0) {
767 TokError("untyped list element in unary operator");
768 return 0;
769 }
770 if (Code == UnOpInit::HEAD) {
771 Type = Itemt->getType();
772 } else {
773 Type = ListRecTy::get(Itemt->getType());
774 }
775 } else {
776 assert(LHSt && "expected list type argument in unary operator");
777 ListRecTy *LType = dynamic_cast<ListRecTy*>(LHSt->getType());
778 if (LType == 0) {
779 TokError("expected list type argumnet in unary operator");
780 return 0;
781 }
782 if (Code == UnOpInit::HEAD) {
783 Type = LType->getElementType();
784 } else {
785 Type = LType;
786 }
787 }
788 }
789 }
790
791 if (Lex.getCode() != tgtok::r_paren) {
792 TokError("expected ')' in unary operator");
793 return 0;
794 }
795 Lex.Lex(); // eat the ')'
796 return (UnOpInit::get(Code, LHS, Type))->Fold(CurRec, CurMultiClass);
797 }
798
799 case tgtok::XConcat:
800 case tgtok::XSRA:
801 case tgtok::XSRL:
802 case tgtok::XSHL:
803 case tgtok::XEq:
804 case tgtok::XStrConcat: { // Value ::= !binop '(' Value ',' Value ')'
805 tgtok::TokKind OpTok = Lex.getCode();
806 SMLoc OpLoc = Lex.getLoc();
807 Lex.Lex(); // eat the operation
808
809 BinOpInit::BinaryOp Code;
810 RecTy *Type = 0;
811
812 switch (OpTok) {
813 default: assert(0 && "Unhandled code!");
814 case tgtok::XConcat: Code = BinOpInit::CONCAT;Type = DagRecTy::get(); break;
815 case tgtok::XSRA: Code = BinOpInit::SRA; Type = IntRecTy::get(); break;
816 case tgtok::XSRL: Code = BinOpInit::SRL; Type = IntRecTy::get(); break;
817 case tgtok::XSHL: Code = BinOpInit::SHL; Type = IntRecTy::get(); break;
818 case tgtok::XEq: Code = BinOpInit::EQ; Type = BitRecTy::get(); break;
819 case tgtok::XStrConcat:
820 Code = BinOpInit::STRCONCAT;
821 Type = StringRecTy::get();
822 break;
823 }
824
825 if (Lex.getCode() != tgtok::l_paren) {
826 TokError("expected '(' after binary operator");
827 return 0;
828 }
829 Lex.Lex(); // eat the '('
830
831 SmallVector<Init*, 2> InitList;
832
833 InitList.push_back(ParseValue(CurRec));
834 if (InitList.back() == 0) return 0;
835
836 while (Lex.getCode() == tgtok::comma) {
837 Lex.Lex(); // eat the ','
838
839 InitList.push_back(ParseValue(CurRec));
840 if (InitList.back() == 0) return 0;
841 }
842
843 if (Lex.getCode() != tgtok::r_paren) {
844 TokError("expected ')' in operator");
845 return 0;
846 }
847 Lex.Lex(); // eat the ')'
848
849 // We allow multiple operands to associative operators like !strconcat as
850 // shorthand for nesting them.
851 if (Code == BinOpInit::STRCONCAT) {
852 while (InitList.size() > 2) {
853 Init *RHS = InitList.pop_back_val();
854 RHS = (BinOpInit::get(Code, InitList.back(), RHS, Type))
855 ->Fold(CurRec, CurMultiClass);
856 InitList.back() = RHS;
857 }
858 }
859
860 if (InitList.size() == 2)
861 return (BinOpInit::get(Code, InitList[0], InitList[1], Type))
862 ->Fold(CurRec, CurMultiClass);
863
864 Error(OpLoc, "expected two operands to operator");
865 return 0;
866 }
867
868 case tgtok::XIf:
869 case tgtok::XForEach:
870 case tgtok::XSubst: { // Value ::= !ternop '(' Value ',' Value ',' Value ')'
871 TernOpInit::TernaryOp Code;
872 RecTy *Type = 0;
873
874 tgtok::TokKind LexCode = Lex.getCode();
875 Lex.Lex(); // eat the operation
876 switch (LexCode) {
877 default: assert(0 && "Unhandled code!");
878 case tgtok::XIf:
879 Code = TernOpInit::IF;
880 break;
881 case tgtok::XForEach:
882 Code = TernOpInit::FOREACH;
883 break;
884 case tgtok::XSubst:
885 Code = TernOpInit::SUBST;
886 break;
887 }
888 if (Lex.getCode() != tgtok::l_paren) {
889 TokError("expected '(' after ternary operator");
890 return 0;
891 }
892 Lex.Lex(); // eat the '('
893
894 Init *LHS = ParseValue(CurRec);
895 if (LHS == 0) return 0;
896
897 if (Lex.getCode() != tgtok::comma) {
898 TokError("expected ',' in ternary operator");
899 return 0;
900 }
901 Lex.Lex(); // eat the ','
902
903 Init *MHS = ParseValue(CurRec);
904 if (MHS == 0) return 0;
905
906 if (Lex.getCode() != tgtok::comma) {
907 TokError("expected ',' in ternary operator");
908 return 0;
909 }
910 Lex.Lex(); // eat the ','
911
912 Init *RHS = ParseValue(CurRec);
913 if (RHS == 0) return 0;
914
915 if (Lex.getCode() != tgtok::r_paren) {
916 TokError("expected ')' in binary operator");
917 return 0;
918 }
919 Lex.Lex(); // eat the ')'
920
921 switch (LexCode) {
922 default: assert(0 && "Unhandled code!");
923 case tgtok::XIf: {
924 // FIXME: The `!if' operator doesn't handle non-TypedInit well at
925 // all. This can be made much more robust.
926 TypedInit *MHSt = dynamic_cast<TypedInit*>(MHS);
927 TypedInit *RHSt = dynamic_cast<TypedInit*>(RHS);
928
929 RecTy *MHSTy = 0;
930 RecTy *RHSTy = 0;
931
932 if (MHSt == 0 && RHSt == 0) {
933 BitsInit *MHSbits = dynamic_cast<BitsInit*>(MHS);
934 BitsInit *RHSbits = dynamic_cast<BitsInit*>(RHS);
935
936 if (MHSbits && RHSbits &&
937 MHSbits->getNumBits() == RHSbits->getNumBits()) {
938 Type = BitRecTy::get();
939 break;
940 } else {
941 BitInit *MHSbit = dynamic_cast<BitInit*>(MHS);
942 BitInit *RHSbit = dynamic_cast<BitInit*>(RHS);
943
944 if (MHSbit && RHSbit) {
945 Type = BitRecTy::get();
946 break;
947 }
948 }
949 } else if (MHSt != 0 && RHSt != 0) {
950 MHSTy = MHSt->getType();
951 RHSTy = RHSt->getType();
952 }
953
954 if (!MHSTy || !RHSTy) {
955 TokError("could not get type for !if");
956 return 0;
957 }
958
959 if (MHSTy->typeIsConvertibleTo(RHSTy)) {
960 Type = RHSTy;
961 } else if (RHSTy->typeIsConvertibleTo(MHSTy)) {
962 Type = MHSTy;
963 } else {
964 TokError("inconsistent types for !if");
965 return 0;
966 }
967 break;
968 }
969 case tgtok::XForEach: {
970 TypedInit *MHSt = dynamic_cast<TypedInit *>(MHS);
971 if (MHSt == 0) {
972 TokError("could not get type for !foreach");
973 return 0;
974 }
975 Type = MHSt->getType();
976 break;
977 }
978 case tgtok::XSubst: {
979 TypedInit *RHSt = dynamic_cast<TypedInit *>(RHS);
980 if (RHSt == 0) {
981 TokError("could not get type for !subst");
982 return 0;
983 }
984 Type = RHSt->getType();
985 break;
986 }
987 }
988 return (TernOpInit::get(Code, LHS, MHS, RHS, Type))->Fold(CurRec,
989 CurMultiClass);
990 }
991 }
992 TokError("could not parse operation");
993 return 0;
994 }
995
996 /// ParseOperatorType - Parse a type for an operator. This returns
997 /// null on error.
998 ///
999 /// OperatorType ::= '<' Type '>'
1000 ///
ParseOperatorType()1001 RecTy *TGParser::ParseOperatorType() {
1002 RecTy *Type = 0;
1003
1004 if (Lex.getCode() != tgtok::less) {
1005 TokError("expected type name for operator");
1006 return 0;
1007 }
1008 Lex.Lex(); // eat the <
1009
1010 Type = ParseType();
1011
1012 if (Type == 0) {
1013 TokError("expected type name for operator");
1014 return 0;
1015 }
1016
1017 if (Lex.getCode() != tgtok::greater) {
1018 TokError("expected type name for operator");
1019 return 0;
1020 }
1021 Lex.Lex(); // eat the >
1022
1023 return Type;
1024 }
1025
1026
1027 /// ParseSimpleValue - Parse a tblgen value. This returns null on error.
1028 ///
1029 /// SimpleValue ::= IDValue
1030 /// SimpleValue ::= INTVAL
1031 /// SimpleValue ::= STRVAL+
1032 /// SimpleValue ::= CODEFRAGMENT
1033 /// SimpleValue ::= '?'
1034 /// SimpleValue ::= '{' ValueList '}'
1035 /// SimpleValue ::= ID '<' ValueListNE '>'
1036 /// SimpleValue ::= '[' ValueList ']'
1037 /// SimpleValue ::= '(' IDValue DagArgList ')'
1038 /// SimpleValue ::= CONCATTOK '(' Value ',' Value ')'
1039 /// SimpleValue ::= SHLTOK '(' Value ',' Value ')'
1040 /// SimpleValue ::= SRATOK '(' Value ',' Value ')'
1041 /// SimpleValue ::= SRLTOK '(' Value ',' Value ')'
1042 /// SimpleValue ::= STRCONCATTOK '(' Value ',' Value ')'
1043 ///
ParseSimpleValue(Record * CurRec,RecTy * ItemType)1044 Init *TGParser::ParseSimpleValue(Record *CurRec, RecTy *ItemType) {
1045 Init *R = 0;
1046 switch (Lex.getCode()) {
1047 default: TokError("Unknown token when parsing a value"); break;
1048 case tgtok::IntVal: R = IntInit::get(Lex.getCurIntVal()); Lex.Lex(); break;
1049 case tgtok::StrVal: {
1050 std::string Val = Lex.getCurStrVal();
1051 Lex.Lex();
1052
1053 // Handle multiple consecutive concatenated strings.
1054 while (Lex.getCode() == tgtok::StrVal) {
1055 Val += Lex.getCurStrVal();
1056 Lex.Lex();
1057 }
1058
1059 R = StringInit::get(Val);
1060 break;
1061 }
1062 case tgtok::CodeFragment:
1063 R = CodeInit::get(Lex.getCurStrVal());
1064 Lex.Lex();
1065 break;
1066 case tgtok::question:
1067 R = UnsetInit::get();
1068 Lex.Lex();
1069 break;
1070 case tgtok::Id: {
1071 SMLoc NameLoc = Lex.getLoc();
1072 std::string Name = Lex.getCurStrVal();
1073 if (Lex.Lex() != tgtok::less) // consume the Id.
1074 return ParseIDValue(CurRec, Name, NameLoc); // Value ::= IDValue
1075
1076 // Value ::= ID '<' ValueListNE '>'
1077 if (Lex.Lex() == tgtok::greater) {
1078 TokError("expected non-empty value list");
1079 return 0;
1080 }
1081
1082 // This is a CLASS<initvalslist> expression. This is supposed to synthesize
1083 // a new anonymous definition, deriving from CLASS<initvalslist> with no
1084 // body.
1085 Record *Class = Records.getClass(Name);
1086 if (!Class) {
1087 Error(NameLoc, "Expected a class name, got '" + Name + "'");
1088 return 0;
1089 }
1090
1091 std::vector<Init*> ValueList = ParseValueList(CurRec, Class);
1092 if (ValueList.empty()) return 0;
1093
1094 if (Lex.getCode() != tgtok::greater) {
1095 TokError("expected '>' at end of value list");
1096 return 0;
1097 }
1098 Lex.Lex(); // eat the '>'
1099
1100 // Create the new record, set it as CurRec temporarily.
1101 static unsigned AnonCounter = 0;
1102 Record *NewRec = new Record("anonymous.val."+utostr(AnonCounter++),
1103 NameLoc,
1104 Records);
1105 SubClassReference SCRef;
1106 SCRef.RefLoc = NameLoc;
1107 SCRef.Rec = Class;
1108 SCRef.TemplateArgs = ValueList;
1109 // Add info about the subclass to NewRec.
1110 if (AddSubClass(NewRec, SCRef))
1111 return 0;
1112 NewRec->resolveReferences();
1113 Records.addDef(NewRec);
1114
1115 // The result of the expression is a reference to the new record.
1116 return DefInit::get(NewRec);
1117 }
1118 case tgtok::l_brace: { // Value ::= '{' ValueList '}'
1119 SMLoc BraceLoc = Lex.getLoc();
1120 Lex.Lex(); // eat the '{'
1121 std::vector<Init*> Vals;
1122
1123 if (Lex.getCode() != tgtok::r_brace) {
1124 Vals = ParseValueList(CurRec);
1125 if (Vals.empty()) return 0;
1126 }
1127 if (Lex.getCode() != tgtok::r_brace) {
1128 TokError("expected '}' at end of bit list value");
1129 return 0;
1130 }
1131 Lex.Lex(); // eat the '}'
1132
1133 SmallVector<Init *, 16> NewBits(Vals.size());
1134
1135 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
1136 Init *Bit = Vals[i]->convertInitializerTo(BitRecTy::get());
1137 if (Bit == 0) {
1138 Error(BraceLoc, "Element #" + utostr(i) + " (" + Vals[i]->getAsString()+
1139 ") is not convertable to a bit");
1140 return 0;
1141 }
1142 NewBits[Vals.size()-i-1] = Bit;
1143 }
1144 return BitsInit::get(NewBits);
1145 }
1146 case tgtok::l_square: { // Value ::= '[' ValueList ']'
1147 Lex.Lex(); // eat the '['
1148 std::vector<Init*> Vals;
1149
1150 RecTy *DeducedEltTy = 0;
1151 ListRecTy *GivenListTy = 0;
1152
1153 if (ItemType != 0) {
1154 ListRecTy *ListType = dynamic_cast<ListRecTy*>(ItemType);
1155 if (ListType == 0) {
1156 std::stringstream s;
1157 s << "Type mismatch for list, expected list type, got "
1158 << ItemType->getAsString();
1159 TokError(s.str());
1160 return 0;
1161 }
1162 GivenListTy = ListType;
1163 }
1164
1165 if (Lex.getCode() != tgtok::r_square) {
1166 Vals = ParseValueList(CurRec, 0,
1167 GivenListTy ? GivenListTy->getElementType() : 0);
1168 if (Vals.empty()) return 0;
1169 }
1170 if (Lex.getCode() != tgtok::r_square) {
1171 TokError("expected ']' at end of list value");
1172 return 0;
1173 }
1174 Lex.Lex(); // eat the ']'
1175
1176 RecTy *GivenEltTy = 0;
1177 if (Lex.getCode() == tgtok::less) {
1178 // Optional list element type
1179 Lex.Lex(); // eat the '<'
1180
1181 GivenEltTy = ParseType();
1182 if (GivenEltTy == 0) {
1183 // Couldn't parse element type
1184 return 0;
1185 }
1186
1187 if (Lex.getCode() != tgtok::greater) {
1188 TokError("expected '>' at end of list element type");
1189 return 0;
1190 }
1191 Lex.Lex(); // eat the '>'
1192 }
1193
1194 // Check elements
1195 RecTy *EltTy = 0;
1196 for (std::vector<Init *>::iterator i = Vals.begin(), ie = Vals.end();
1197 i != ie;
1198 ++i) {
1199 TypedInit *TArg = dynamic_cast<TypedInit*>(*i);
1200 if (TArg == 0) {
1201 TokError("Untyped list element");
1202 return 0;
1203 }
1204 if (EltTy != 0) {
1205 EltTy = resolveTypes(EltTy, TArg->getType());
1206 if (EltTy == 0) {
1207 TokError("Incompatible types in list elements");
1208 return 0;
1209 }
1210 } else {
1211 EltTy = TArg->getType();
1212 }
1213 }
1214
1215 if (GivenEltTy != 0) {
1216 if (EltTy != 0) {
1217 // Verify consistency
1218 if (!EltTy->typeIsConvertibleTo(GivenEltTy)) {
1219 TokError("Incompatible types in list elements");
1220 return 0;
1221 }
1222 }
1223 EltTy = GivenEltTy;
1224 }
1225
1226 if (EltTy == 0) {
1227 if (ItemType == 0) {
1228 TokError("No type for list");
1229 return 0;
1230 }
1231 DeducedEltTy = GivenListTy->getElementType();
1232 } else {
1233 // Make sure the deduced type is compatible with the given type
1234 if (GivenListTy) {
1235 if (!EltTy->typeIsConvertibleTo(GivenListTy->getElementType())) {
1236 TokError("Element type mismatch for list");
1237 return 0;
1238 }
1239 }
1240 DeducedEltTy = EltTy;
1241 }
1242
1243 return ListInit::get(Vals, DeducedEltTy);
1244 }
1245 case tgtok::l_paren: { // Value ::= '(' IDValue DagArgList ')'
1246 Lex.Lex(); // eat the '('
1247 if (Lex.getCode() != tgtok::Id && Lex.getCode() != tgtok::XCast) {
1248 TokError("expected identifier in dag init");
1249 return 0;
1250 }
1251
1252 Init *Operator = ParseValue(CurRec);
1253 if (Operator == 0) return 0;
1254
1255 // If the operator name is present, parse it.
1256 std::string OperatorName;
1257 if (Lex.getCode() == tgtok::colon) {
1258 if (Lex.Lex() != tgtok::VarName) { // eat the ':'
1259 TokError("expected variable name in dag operator");
1260 return 0;
1261 }
1262 OperatorName = Lex.getCurStrVal();
1263 Lex.Lex(); // eat the VarName.
1264 }
1265
1266 std::vector<std::pair<llvm::Init*, std::string> > DagArgs;
1267 if (Lex.getCode() != tgtok::r_paren) {
1268 DagArgs = ParseDagArgList(CurRec);
1269 if (DagArgs.empty()) return 0;
1270 }
1271
1272 if (Lex.getCode() != tgtok::r_paren) {
1273 TokError("expected ')' in dag init");
1274 return 0;
1275 }
1276 Lex.Lex(); // eat the ')'
1277
1278 return DagInit::get(Operator, OperatorName, DagArgs);
1279 }
1280
1281 case tgtok::XHead:
1282 case tgtok::XTail:
1283 case tgtok::XEmpty:
1284 case tgtok::XCast: // Value ::= !unop '(' Value ')'
1285 case tgtok::XConcat:
1286 case tgtok::XSRA:
1287 case tgtok::XSRL:
1288 case tgtok::XSHL:
1289 case tgtok::XEq:
1290 case tgtok::XStrConcat: // Value ::= !binop '(' Value ',' Value ')'
1291 case tgtok::XIf:
1292 case tgtok::XForEach:
1293 case tgtok::XSubst: { // Value ::= !ternop '(' Value ',' Value ',' Value ')'
1294 return ParseOperation(CurRec);
1295 }
1296 }
1297
1298 return R;
1299 }
1300
1301 /// ParseValue - Parse a tblgen value. This returns null on error.
1302 ///
1303 /// Value ::= SimpleValue ValueSuffix*
1304 /// ValueSuffix ::= '{' BitList '}'
1305 /// ValueSuffix ::= '[' BitList ']'
1306 /// ValueSuffix ::= '.' ID
1307 ///
ParseValue(Record * CurRec,RecTy * ItemType)1308 Init *TGParser::ParseValue(Record *CurRec, RecTy *ItemType) {
1309 Init *Result = ParseSimpleValue(CurRec, ItemType);
1310 if (Result == 0) return 0;
1311
1312 // Parse the suffixes now if present.
1313 while (1) {
1314 switch (Lex.getCode()) {
1315 default: return Result;
1316 case tgtok::l_brace: {
1317 SMLoc CurlyLoc = Lex.getLoc();
1318 Lex.Lex(); // eat the '{'
1319 std::vector<unsigned> Ranges = ParseRangeList();
1320 if (Ranges.empty()) return 0;
1321
1322 // Reverse the bitlist.
1323 std::reverse(Ranges.begin(), Ranges.end());
1324 Result = Result->convertInitializerBitRange(Ranges);
1325 if (Result == 0) {
1326 Error(CurlyLoc, "Invalid bit range for value");
1327 return 0;
1328 }
1329
1330 // Eat the '}'.
1331 if (Lex.getCode() != tgtok::r_brace) {
1332 TokError("expected '}' at end of bit range list");
1333 return 0;
1334 }
1335 Lex.Lex();
1336 break;
1337 }
1338 case tgtok::l_square: {
1339 SMLoc SquareLoc = Lex.getLoc();
1340 Lex.Lex(); // eat the '['
1341 std::vector<unsigned> Ranges = ParseRangeList();
1342 if (Ranges.empty()) return 0;
1343
1344 Result = Result->convertInitListSlice(Ranges);
1345 if (Result == 0) {
1346 Error(SquareLoc, "Invalid range for list slice");
1347 return 0;
1348 }
1349
1350 // Eat the ']'.
1351 if (Lex.getCode() != tgtok::r_square) {
1352 TokError("expected ']' at end of list slice");
1353 return 0;
1354 }
1355 Lex.Lex();
1356 break;
1357 }
1358 case tgtok::period:
1359 if (Lex.Lex() != tgtok::Id) { // eat the .
1360 TokError("expected field identifier after '.'");
1361 return 0;
1362 }
1363 if (!Result->getFieldType(Lex.getCurStrVal())) {
1364 TokError("Cannot access field '" + Lex.getCurStrVal() + "' of value '" +
1365 Result->getAsString() + "'");
1366 return 0;
1367 }
1368 Result = FieldInit::get(Result, Lex.getCurStrVal());
1369 Lex.Lex(); // eat field name
1370 break;
1371 }
1372 }
1373 }
1374
1375 /// ParseDagArgList - Parse the argument list for a dag literal expression.
1376 ///
1377 /// ParseDagArgList ::= Value (':' VARNAME)?
1378 /// ParseDagArgList ::= ParseDagArgList ',' Value (':' VARNAME)?
1379 std::vector<std::pair<llvm::Init*, std::string> >
ParseDagArgList(Record * CurRec)1380 TGParser::ParseDagArgList(Record *CurRec) {
1381 std::vector<std::pair<llvm::Init*, std::string> > Result;
1382
1383 while (1) {
1384 Init *Val = ParseValue(CurRec);
1385 if (Val == 0) return std::vector<std::pair<llvm::Init*, std::string> >();
1386
1387 // If the variable name is present, add it.
1388 std::string VarName;
1389 if (Lex.getCode() == tgtok::colon) {
1390 if (Lex.Lex() != tgtok::VarName) { // eat the ':'
1391 TokError("expected variable name in dag literal");
1392 return std::vector<std::pair<llvm::Init*, std::string> >();
1393 }
1394 VarName = Lex.getCurStrVal();
1395 Lex.Lex(); // eat the VarName.
1396 }
1397
1398 Result.push_back(std::make_pair(Val, VarName));
1399
1400 if (Lex.getCode() != tgtok::comma) break;
1401 Lex.Lex(); // eat the ','
1402 }
1403
1404 return Result;
1405 }
1406
1407
1408 /// ParseValueList - Parse a comma separated list of values, returning them as a
1409 /// vector. Note that this always expects to be able to parse at least one
1410 /// value. It returns an empty list if this is not possible.
1411 ///
1412 /// ValueList ::= Value (',' Value)
1413 ///
ParseValueList(Record * CurRec,Record * ArgsRec,RecTy * EltTy)1414 std::vector<Init*> TGParser::ParseValueList(Record *CurRec, Record *ArgsRec,
1415 RecTy *EltTy) {
1416 std::vector<Init*> Result;
1417 RecTy *ItemType = EltTy;
1418 unsigned int ArgN = 0;
1419 if (ArgsRec != 0 && EltTy == 0) {
1420 const std::vector<std::string> &TArgs = ArgsRec->getTemplateArgs();
1421 const RecordVal *RV = ArgsRec->getValue(TArgs[ArgN]);
1422 if (!RV) {
1423 errs() << "Cannot find template arg " << ArgN << " (" << TArgs[ArgN]
1424 << ")\n";
1425 }
1426 assert(RV && "Template argument record not found??");
1427 ItemType = RV->getType();
1428 ++ArgN;
1429 }
1430 Result.push_back(ParseValue(CurRec, ItemType));
1431 if (Result.back() == 0) return std::vector<Init*>();
1432
1433 while (Lex.getCode() == tgtok::comma) {
1434 Lex.Lex(); // Eat the comma
1435
1436 if (ArgsRec != 0 && EltTy == 0) {
1437 const std::vector<std::string> &TArgs = ArgsRec->getTemplateArgs();
1438 if (ArgN >= TArgs.size()) {
1439 TokError("too many template arguments");
1440 return std::vector<Init*>();
1441 }
1442 const RecordVal *RV = ArgsRec->getValue(TArgs[ArgN]);
1443 assert(RV && "Template argument record not found??");
1444 ItemType = RV->getType();
1445 ++ArgN;
1446 }
1447 Result.push_back(ParseValue(CurRec, ItemType));
1448 if (Result.back() == 0) return std::vector<Init*>();
1449 }
1450
1451 return Result;
1452 }
1453
1454
1455 /// ParseDeclaration - Read a declaration, returning the name of field ID, or an
1456 /// empty string on error. This can happen in a number of different context's,
1457 /// including within a def or in the template args for a def (which which case
1458 /// CurRec will be non-null) and within the template args for a multiclass (in
1459 /// which case CurRec will be null, but CurMultiClass will be set). This can
1460 /// also happen within a def that is within a multiclass, which will set both
1461 /// CurRec and CurMultiClass.
1462 ///
1463 /// Declaration ::= FIELD? Type ID ('=' Value)?
1464 ///
ParseDeclaration(Record * CurRec,bool ParsingTemplateArgs)1465 std::string TGParser::ParseDeclaration(Record *CurRec,
1466 bool ParsingTemplateArgs) {
1467 // Read the field prefix if present.
1468 bool HasField = Lex.getCode() == tgtok::Field;
1469 if (HasField) Lex.Lex();
1470
1471 RecTy *Type = ParseType();
1472 if (Type == 0) return "";
1473
1474 if (Lex.getCode() != tgtok::Id) {
1475 TokError("Expected identifier in declaration");
1476 return "";
1477 }
1478
1479 SMLoc IdLoc = Lex.getLoc();
1480 std::string DeclName = Lex.getCurStrVal();
1481 Lex.Lex();
1482
1483 if (ParsingTemplateArgs) {
1484 if (CurRec) {
1485 DeclName = CurRec->getName() + ":" + DeclName;
1486 } else {
1487 assert(CurMultiClass);
1488 }
1489 if (CurMultiClass)
1490 DeclName = CurMultiClass->Rec.getName() + "::" + DeclName;
1491 }
1492
1493 // Add the value.
1494 if (AddValue(CurRec, IdLoc, RecordVal(DeclName, Type, HasField)))
1495 return "";
1496
1497 // If a value is present, parse it.
1498 if (Lex.getCode() == tgtok::equal) {
1499 Lex.Lex();
1500 SMLoc ValLoc = Lex.getLoc();
1501 Init *Val = ParseValue(CurRec, Type);
1502 if (Val == 0 ||
1503 SetValue(CurRec, ValLoc, DeclName, std::vector<unsigned>(), Val))
1504 return "";
1505 }
1506
1507 return DeclName;
1508 }
1509
1510 /// ParseTemplateArgList - Read a template argument list, which is a non-empty
1511 /// sequence of template-declarations in <>'s. If CurRec is non-null, these are
1512 /// template args for a def, which may or may not be in a multiclass. If null,
1513 /// these are the template args for a multiclass.
1514 ///
1515 /// TemplateArgList ::= '<' Declaration (',' Declaration)* '>'
1516 ///
ParseTemplateArgList(Record * CurRec)1517 bool TGParser::ParseTemplateArgList(Record *CurRec) {
1518 assert(Lex.getCode() == tgtok::less && "Not a template arg list!");
1519 Lex.Lex(); // eat the '<'
1520
1521 Record *TheRecToAddTo = CurRec ? CurRec : &CurMultiClass->Rec;
1522
1523 // Read the first declaration.
1524 std::string TemplArg = ParseDeclaration(CurRec, true/*templateargs*/);
1525 if (TemplArg.empty())
1526 return true;
1527
1528 TheRecToAddTo->addTemplateArg(TemplArg);
1529
1530 while (Lex.getCode() == tgtok::comma) {
1531 Lex.Lex(); // eat the ','
1532
1533 // Read the following declarations.
1534 TemplArg = ParseDeclaration(CurRec, true/*templateargs*/);
1535 if (TemplArg.empty())
1536 return true;
1537 TheRecToAddTo->addTemplateArg(TemplArg);
1538 }
1539
1540 if (Lex.getCode() != tgtok::greater)
1541 return TokError("expected '>' at end of template argument list");
1542 Lex.Lex(); // eat the '>'.
1543 return false;
1544 }
1545
1546
1547 /// ParseBodyItem - Parse a single item at within the body of a def or class.
1548 ///
1549 /// BodyItem ::= Declaration ';'
1550 /// BodyItem ::= LET ID OptionalBitList '=' Value ';'
ParseBodyItem(Record * CurRec)1551 bool TGParser::ParseBodyItem(Record *CurRec) {
1552 if (Lex.getCode() != tgtok::Let) {
1553 if (ParseDeclaration(CurRec, false).empty())
1554 return true;
1555
1556 if (Lex.getCode() != tgtok::semi)
1557 return TokError("expected ';' after declaration");
1558 Lex.Lex();
1559 return false;
1560 }
1561
1562 // LET ID OptionalRangeList '=' Value ';'
1563 if (Lex.Lex() != tgtok::Id)
1564 return TokError("expected field identifier after let");
1565
1566 SMLoc IdLoc = Lex.getLoc();
1567 std::string FieldName = Lex.getCurStrVal();
1568 Lex.Lex(); // eat the field name.
1569
1570 std::vector<unsigned> BitList;
1571 if (ParseOptionalBitList(BitList))
1572 return true;
1573 std::reverse(BitList.begin(), BitList.end());
1574
1575 if (Lex.getCode() != tgtok::equal)
1576 return TokError("expected '=' in let expression");
1577 Lex.Lex(); // eat the '='.
1578
1579 RecordVal *Field = CurRec->getValue(FieldName);
1580 if (Field == 0)
1581 return TokError("Value '" + FieldName + "' unknown!");
1582
1583 RecTy *Type = Field->getType();
1584
1585 Init *Val = ParseValue(CurRec, Type);
1586 if (Val == 0) return true;
1587
1588 if (Lex.getCode() != tgtok::semi)
1589 return TokError("expected ';' after let expression");
1590 Lex.Lex();
1591
1592 return SetValue(CurRec, IdLoc, FieldName, BitList, Val);
1593 }
1594
1595 /// ParseBody - Read the body of a class or def. Return true on error, false on
1596 /// success.
1597 ///
1598 /// Body ::= ';'
1599 /// Body ::= '{' BodyList '}'
1600 /// BodyList BodyItem*
1601 ///
ParseBody(Record * CurRec)1602 bool TGParser::ParseBody(Record *CurRec) {
1603 // If this is a null definition, just eat the semi and return.
1604 if (Lex.getCode() == tgtok::semi) {
1605 Lex.Lex();
1606 return false;
1607 }
1608
1609 if (Lex.getCode() != tgtok::l_brace)
1610 return TokError("Expected ';' or '{' to start body");
1611 // Eat the '{'.
1612 Lex.Lex();
1613
1614 while (Lex.getCode() != tgtok::r_brace)
1615 if (ParseBodyItem(CurRec))
1616 return true;
1617
1618 // Eat the '}'.
1619 Lex.Lex();
1620 return false;
1621 }
1622
1623 /// ParseObjectBody - Parse the body of a def or class. This consists of an
1624 /// optional ClassList followed by a Body. CurRec is the current def or class
1625 /// that is being parsed.
1626 ///
1627 /// ObjectBody ::= BaseClassList Body
1628 /// BaseClassList ::= /*empty*/
1629 /// BaseClassList ::= ':' BaseClassListNE
1630 /// BaseClassListNE ::= SubClassRef (',' SubClassRef)*
1631 ///
ParseObjectBody(Record * CurRec)1632 bool TGParser::ParseObjectBody(Record *CurRec) {
1633 // If there is a baseclass list, read it.
1634 if (Lex.getCode() == tgtok::colon) {
1635 Lex.Lex();
1636
1637 // Read all of the subclasses.
1638 SubClassReference SubClass = ParseSubClassReference(CurRec, false);
1639 while (1) {
1640 // Check for error.
1641 if (SubClass.Rec == 0) return true;
1642
1643 // Add it.
1644 if (AddSubClass(CurRec, SubClass))
1645 return true;
1646
1647 if (Lex.getCode() != tgtok::comma) break;
1648 Lex.Lex(); // eat ','.
1649 SubClass = ParseSubClassReference(CurRec, false);
1650 }
1651 }
1652
1653 // Process any variables on the let stack.
1654 for (unsigned i = 0, e = LetStack.size(); i != e; ++i)
1655 for (unsigned j = 0, e = LetStack[i].size(); j != e; ++j)
1656 if (SetValue(CurRec, LetStack[i][j].Loc, LetStack[i][j].Name,
1657 LetStack[i][j].Bits, LetStack[i][j].Value))
1658 return true;
1659
1660 return ParseBody(CurRec);
1661 }
1662
1663 /// ParseDef - Parse and return a top level or multiclass def, return the record
1664 /// corresponding to it. This returns null on error.
1665 ///
1666 /// DefInst ::= DEF ObjectName ObjectBody
1667 ///
ParseDef(MultiClass * CurMultiClass)1668 bool TGParser::ParseDef(MultiClass *CurMultiClass) {
1669 SMLoc DefLoc = Lex.getLoc();
1670 assert(Lex.getCode() == tgtok::Def && "Unknown tok");
1671 Lex.Lex(); // Eat the 'def' token.
1672
1673 // Parse ObjectName and make a record for it.
1674 Record *CurRec = new Record(ParseObjectName(), DefLoc, Records);
1675
1676 if (!CurMultiClass) {
1677 // Top-level def definition.
1678
1679 // Ensure redefinition doesn't happen.
1680 if (Records.getDef(CurRec->getName())) {
1681 Error(DefLoc, "def '" + CurRec->getName() + "' already defined");
1682 return true;
1683 }
1684 Records.addDef(CurRec);
1685 } else {
1686 // Otherwise, a def inside a multiclass, add it to the multiclass.
1687 for (unsigned i = 0, e = CurMultiClass->DefPrototypes.size(); i != e; ++i)
1688 if (CurMultiClass->DefPrototypes[i]->getName() == CurRec->getName()) {
1689 Error(DefLoc, "def '" + CurRec->getName() +
1690 "' already defined in this multiclass!");
1691 return true;
1692 }
1693 CurMultiClass->DefPrototypes.push_back(CurRec);
1694 }
1695
1696 if (ParseObjectBody(CurRec))
1697 return true;
1698
1699 if (CurMultiClass == 0) // Def's in multiclasses aren't really defs.
1700 // See Record::setName(). This resolve step will see any new name
1701 // for the def that might have been created when resolving
1702 // inheritance, values and arguments above.
1703 CurRec->resolveReferences();
1704
1705 // If ObjectBody has template arguments, it's an error.
1706 assert(CurRec->getTemplateArgs().empty() && "How'd this get template args?");
1707
1708 if (CurMultiClass) {
1709 // Copy the template arguments for the multiclass into the def.
1710 const std::vector<std::string> &TArgs =
1711 CurMultiClass->Rec.getTemplateArgs();
1712
1713 for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
1714 const RecordVal *RV = CurMultiClass->Rec.getValue(TArgs[i]);
1715 assert(RV && "Template arg doesn't exist?");
1716 CurRec->addValue(*RV);
1717 }
1718 }
1719
1720 return false;
1721 }
1722
1723 /// ParseClass - Parse a tblgen class definition.
1724 ///
1725 /// ClassInst ::= CLASS ID TemplateArgList? ObjectBody
1726 ///
ParseClass()1727 bool TGParser::ParseClass() {
1728 assert(Lex.getCode() == tgtok::Class && "Unexpected token!");
1729 Lex.Lex();
1730
1731 if (Lex.getCode() != tgtok::Id)
1732 return TokError("expected class name after 'class' keyword");
1733
1734 Record *CurRec = Records.getClass(Lex.getCurStrVal());
1735 if (CurRec) {
1736 // If the body was previously defined, this is an error.
1737 if (!CurRec->getValues().empty() ||
1738 !CurRec->getSuperClasses().empty() ||
1739 !CurRec->getTemplateArgs().empty())
1740 return TokError("Class '" + CurRec->getName() + "' already defined");
1741 } else {
1742 // If this is the first reference to this class, create and add it.
1743 CurRec = new Record(Lex.getCurStrVal(), Lex.getLoc(), Records);
1744 Records.addClass(CurRec);
1745 }
1746 Lex.Lex(); // eat the name.
1747
1748 // If there are template args, parse them.
1749 if (Lex.getCode() == tgtok::less)
1750 if (ParseTemplateArgList(CurRec))
1751 return true;
1752
1753 // Finally, parse the object body.
1754 return ParseObjectBody(CurRec);
1755 }
1756
1757 /// ParseLetList - Parse a non-empty list of assignment expressions into a list
1758 /// of LetRecords.
1759 ///
1760 /// LetList ::= LetItem (',' LetItem)*
1761 /// LetItem ::= ID OptionalRangeList '=' Value
1762 ///
ParseLetList()1763 std::vector<LetRecord> TGParser::ParseLetList() {
1764 std::vector<LetRecord> Result;
1765
1766 while (1) {
1767 if (Lex.getCode() != tgtok::Id) {
1768 TokError("expected identifier in let definition");
1769 return std::vector<LetRecord>();
1770 }
1771 std::string Name = Lex.getCurStrVal();
1772 SMLoc NameLoc = Lex.getLoc();
1773 Lex.Lex(); // Eat the identifier.
1774
1775 // Check for an optional RangeList.
1776 std::vector<unsigned> Bits;
1777 if (ParseOptionalRangeList(Bits))
1778 return std::vector<LetRecord>();
1779 std::reverse(Bits.begin(), Bits.end());
1780
1781 if (Lex.getCode() != tgtok::equal) {
1782 TokError("expected '=' in let expression");
1783 return std::vector<LetRecord>();
1784 }
1785 Lex.Lex(); // eat the '='.
1786
1787 Init *Val = ParseValue(0);
1788 if (Val == 0) return std::vector<LetRecord>();
1789
1790 // Now that we have everything, add the record.
1791 Result.push_back(LetRecord(Name, Bits, Val, NameLoc));
1792
1793 if (Lex.getCode() != tgtok::comma)
1794 return Result;
1795 Lex.Lex(); // eat the comma.
1796 }
1797 }
1798
1799 /// ParseTopLevelLet - Parse a 'let' at top level. This can be a couple of
1800 /// different related productions. This works inside multiclasses too.
1801 ///
1802 /// Object ::= LET LetList IN '{' ObjectList '}'
1803 /// Object ::= LET LetList IN Object
1804 ///
ParseTopLevelLet(MultiClass * CurMultiClass)1805 bool TGParser::ParseTopLevelLet(MultiClass *CurMultiClass) {
1806 assert(Lex.getCode() == tgtok::Let && "Unexpected token");
1807 Lex.Lex();
1808
1809 // Add this entry to the let stack.
1810 std::vector<LetRecord> LetInfo = ParseLetList();
1811 if (LetInfo.empty()) return true;
1812 LetStack.push_back(LetInfo);
1813
1814 if (Lex.getCode() != tgtok::In)
1815 return TokError("expected 'in' at end of top-level 'let'");
1816 Lex.Lex();
1817
1818 // If this is a scalar let, just handle it now
1819 if (Lex.getCode() != tgtok::l_brace) {
1820 // LET LetList IN Object
1821 if (ParseObject(CurMultiClass))
1822 return true;
1823 } else { // Object ::= LETCommand '{' ObjectList '}'
1824 SMLoc BraceLoc = Lex.getLoc();
1825 // Otherwise, this is a group let.
1826 Lex.Lex(); // eat the '{'.
1827
1828 // Parse the object list.
1829 if (ParseObjectList(CurMultiClass))
1830 return true;
1831
1832 if (Lex.getCode() != tgtok::r_brace) {
1833 TokError("expected '}' at end of top level let command");
1834 return Error(BraceLoc, "to match this '{'");
1835 }
1836 Lex.Lex();
1837 }
1838
1839 // Outside this let scope, this let block is not active.
1840 LetStack.pop_back();
1841 return false;
1842 }
1843
1844 /// ParseMultiClass - Parse a multiclass definition.
1845 ///
1846 /// MultiClassInst ::= MULTICLASS ID TemplateArgList?
1847 /// ':' BaseMultiClassList '{' MultiClassDef+ '}'
1848 ///
ParseMultiClass()1849 bool TGParser::ParseMultiClass() {
1850 assert(Lex.getCode() == tgtok::MultiClass && "Unexpected token");
1851 Lex.Lex(); // Eat the multiclass token.
1852
1853 if (Lex.getCode() != tgtok::Id)
1854 return TokError("expected identifier after multiclass for name");
1855 std::string Name = Lex.getCurStrVal();
1856
1857 if (MultiClasses.count(Name))
1858 return TokError("multiclass '" + Name + "' already defined");
1859
1860 CurMultiClass = MultiClasses[Name] = new MultiClass(Name,
1861 Lex.getLoc(), Records);
1862 Lex.Lex(); // Eat the identifier.
1863
1864 // If there are template args, parse them.
1865 if (Lex.getCode() == tgtok::less)
1866 if (ParseTemplateArgList(0))
1867 return true;
1868
1869 bool inherits = false;
1870
1871 // If there are submulticlasses, parse them.
1872 if (Lex.getCode() == tgtok::colon) {
1873 inherits = true;
1874
1875 Lex.Lex();
1876
1877 // Read all of the submulticlasses.
1878 SubMultiClassReference SubMultiClass =
1879 ParseSubMultiClassReference(CurMultiClass);
1880 while (1) {
1881 // Check for error.
1882 if (SubMultiClass.MC == 0) return true;
1883
1884 // Add it.
1885 if (AddSubMultiClass(CurMultiClass, SubMultiClass))
1886 return true;
1887
1888 if (Lex.getCode() != tgtok::comma) break;
1889 Lex.Lex(); // eat ','.
1890 SubMultiClass = ParseSubMultiClassReference(CurMultiClass);
1891 }
1892 }
1893
1894 if (Lex.getCode() != tgtok::l_brace) {
1895 if (!inherits)
1896 return TokError("expected '{' in multiclass definition");
1897 else if (Lex.getCode() != tgtok::semi)
1898 return TokError("expected ';' in multiclass definition");
1899 else
1900 Lex.Lex(); // eat the ';'.
1901 } else {
1902 if (Lex.Lex() == tgtok::r_brace) // eat the '{'.
1903 return TokError("multiclass must contain at least one def");
1904
1905 while (Lex.getCode() != tgtok::r_brace) {
1906 switch (Lex.getCode()) {
1907 default:
1908 return TokError("expected 'let', 'def' or 'defm' in multiclass body");
1909 case tgtok::Let:
1910 case tgtok::Def:
1911 case tgtok::Defm:
1912 if (ParseObject(CurMultiClass))
1913 return true;
1914 break;
1915 }
1916 }
1917 Lex.Lex(); // eat the '}'.
1918 }
1919
1920 CurMultiClass = 0;
1921 return false;
1922 }
1923
1924 Record *TGParser::
InstantiateMulticlassDef(MultiClass & MC,Record * DefProto,const std::string & DefmPrefix,SMLoc DefmPrefixLoc)1925 InstantiateMulticlassDef(MultiClass &MC,
1926 Record *DefProto,
1927 const std::string &DefmPrefix,
1928 SMLoc DefmPrefixLoc) {
1929 // Add in the defm name. If the defm prefix is empty, give each
1930 // instantiated def a unique name. Otherwise, if "#NAME#" exists in the
1931 // name, substitute the prefix for #NAME#. Otherwise, use the defm name
1932 // as a prefix.
1933 std::string DefName = DefProto->getName();
1934 if (DefmPrefix.empty()) {
1935 DefName = GetNewAnonymousName();
1936 } else {
1937 std::string::size_type idx = DefName.find("#NAME#");
1938 if (idx != std::string::npos) {
1939 DefName.replace(idx, 6, DefmPrefix);
1940 } else {
1941 // Add the suffix to the defm name to get the new name.
1942 DefName = DefmPrefix + DefName;
1943 }
1944 }
1945
1946 Record *CurRec = new Record(DefName, DefmPrefixLoc, Records);
1947
1948 SubClassReference Ref;
1949 Ref.RefLoc = DefmPrefixLoc;
1950 Ref.Rec = DefProto;
1951 AddSubClass(CurRec, Ref);
1952
1953 return CurRec;
1954 }
1955
ResolveMulticlassDefArgs(MultiClass & MC,Record * CurRec,SMLoc DefmPrefixLoc,SMLoc SubClassLoc,const std::vector<std::string> & TArgs,std::vector<Init * > & TemplateVals,bool DeleteArgs)1956 bool TGParser::ResolveMulticlassDefArgs(MultiClass &MC,
1957 Record *CurRec,
1958 SMLoc DefmPrefixLoc,
1959 SMLoc SubClassLoc,
1960 const std::vector<std::string> &TArgs,
1961 std::vector<Init *> &TemplateVals,
1962 bool DeleteArgs) {
1963 // Loop over all of the template arguments, setting them to the specified
1964 // value or leaving them as the default if necessary.
1965 for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
1966 // Check if a value is specified for this temp-arg.
1967 if (i < TemplateVals.size()) {
1968 // Set it now.
1969 if (SetValue(CurRec, DefmPrefixLoc, TArgs[i], std::vector<unsigned>(),
1970 TemplateVals[i]))
1971 return true;
1972
1973 // Resolve it next.
1974 CurRec->resolveReferencesTo(CurRec->getValue(TArgs[i]));
1975
1976 if (DeleteArgs)
1977 // Now remove it.
1978 CurRec->removeValue(TArgs[i]);
1979
1980 } else if (!CurRec->getValue(TArgs[i])->getValue()->isComplete()) {
1981 return Error(SubClassLoc, "value not specified for template argument #"+
1982 utostr(i) + " (" + TArgs[i] + ") of multiclassclass '" +
1983 MC.Rec.getName() + "'");
1984 }
1985 }
1986 return false;
1987 }
1988
ResolveMulticlassDef(MultiClass & MC,Record * CurRec,Record * DefProto,SMLoc DefmPrefixLoc)1989 bool TGParser::ResolveMulticlassDef(MultiClass &MC,
1990 Record *CurRec,
1991 Record *DefProto,
1992 SMLoc DefmPrefixLoc) {
1993 // If the mdef is inside a 'let' expression, add to each def.
1994 for (unsigned i = 0, e = LetStack.size(); i != e; ++i)
1995 for (unsigned j = 0, e = LetStack[i].size(); j != e; ++j)
1996 if (SetValue(CurRec, LetStack[i][j].Loc, LetStack[i][j].Name,
1997 LetStack[i][j].Bits, LetStack[i][j].Value))
1998 return Error(DefmPrefixLoc, "when instantiating this defm");
1999
2000 // Ensure redefinition doesn't happen.
2001 if (Records.getDef(CurRec->getName()))
2002 return Error(DefmPrefixLoc, "def '" + CurRec->getName() +
2003 "' already defined, instantiating defm with subdef '" +
2004 DefProto->getName() + "'");
2005
2006 // Don't create a top level definition for defm inside multiclasses,
2007 // instead, only update the prototypes and bind the template args
2008 // with the new created definition.
2009 if (CurMultiClass) {
2010 for (unsigned i = 0, e = CurMultiClass->DefPrototypes.size();
2011 i != e; ++i)
2012 if (CurMultiClass->DefPrototypes[i]->getName() == CurRec->getName())
2013 return Error(DefmPrefixLoc, "defm '" + CurRec->getName() +
2014 "' already defined in this multiclass!");
2015 CurMultiClass->DefPrototypes.push_back(CurRec);
2016
2017 // Copy the template arguments for the multiclass into the new def.
2018 const std::vector<std::string> &TA =
2019 CurMultiClass->Rec.getTemplateArgs();
2020
2021 for (unsigned i = 0, e = TA.size(); i != e; ++i) {
2022 const RecordVal *RV = CurMultiClass->Rec.getValue(TA[i]);
2023 assert(RV && "Template arg doesn't exist?");
2024 CurRec->addValue(*RV);
2025 }
2026 } else {
2027 Records.addDef(CurRec);
2028 }
2029
2030 return false;
2031 }
2032
2033 /// ParseDefm - Parse the instantiation of a multiclass.
2034 ///
2035 /// DefMInst ::= DEFM ID ':' DefmSubClassRef ';'
2036 ///
ParseDefm(MultiClass * CurMultiClass)2037 bool TGParser::ParseDefm(MultiClass *CurMultiClass) {
2038 assert(Lex.getCode() == tgtok::Defm && "Unexpected token!");
2039
2040 std::string DefmPrefix;
2041 if (Lex.Lex() == tgtok::Id) { // eat the defm.
2042 DefmPrefix = Lex.getCurStrVal();
2043 Lex.Lex(); // Eat the defm prefix.
2044 }
2045
2046 SMLoc DefmPrefixLoc = Lex.getLoc();
2047 if (Lex.getCode() != tgtok::colon)
2048 return TokError("expected ':' after defm identifier");
2049
2050 // Keep track of the new generated record definitions.
2051 std::vector<Record*> NewRecDefs;
2052
2053 // This record also inherits from a regular class (non-multiclass)?
2054 bool InheritFromClass = false;
2055
2056 // eat the colon.
2057 Lex.Lex();
2058
2059 SMLoc SubClassLoc = Lex.getLoc();
2060 SubClassReference Ref = ParseSubClassReference(0, true);
2061
2062 while (1) {
2063 if (Ref.Rec == 0) return true;
2064
2065 // To instantiate a multiclass, we need to first get the multiclass, then
2066 // instantiate each def contained in the multiclass with the SubClassRef
2067 // template parameters.
2068 MultiClass *MC = MultiClasses[Ref.Rec->getName()];
2069 assert(MC && "Didn't lookup multiclass correctly?");
2070 std::vector<Init*> &TemplateVals = Ref.TemplateArgs;
2071
2072 // Verify that the correct number of template arguments were specified.
2073 const std::vector<std::string> &TArgs = MC->Rec.getTemplateArgs();
2074 if (TArgs.size() < TemplateVals.size())
2075 return Error(SubClassLoc,
2076 "more template args specified than multiclass expects");
2077
2078 // Loop over all the def's in the multiclass, instantiating each one.
2079 for (unsigned i = 0, e = MC->DefPrototypes.size(); i != e; ++i) {
2080 Record *DefProto = MC->DefPrototypes[i];
2081
2082 Record *CurRec = InstantiateMulticlassDef(*MC, DefProto, DefmPrefix, DefmPrefixLoc);
2083
2084 if (ResolveMulticlassDefArgs(*MC, CurRec, DefmPrefixLoc, SubClassLoc,
2085 TArgs, TemplateVals, true/*Delete args*/))
2086 return Error(SubClassLoc, "could not instantiate def");
2087
2088 if (ResolveMulticlassDef(*MC, CurRec, DefProto, DefmPrefixLoc))
2089 return Error(SubClassLoc, "could not instantiate def");
2090
2091 NewRecDefs.push_back(CurRec);
2092 }
2093
2094
2095 if (Lex.getCode() != tgtok::comma) break;
2096 Lex.Lex(); // eat ','.
2097
2098 SubClassLoc = Lex.getLoc();
2099
2100 // A defm can inherit from regular classes (non-multiclass) as
2101 // long as they come in the end of the inheritance list.
2102 InheritFromClass = (Records.getClass(Lex.getCurStrVal()) != 0);
2103
2104 if (InheritFromClass)
2105 break;
2106
2107 Ref = ParseSubClassReference(0, true);
2108 }
2109
2110 if (InheritFromClass) {
2111 // Process all the classes to inherit as if they were part of a
2112 // regular 'def' and inherit all record values.
2113 SubClassReference SubClass = ParseSubClassReference(0, false);
2114 while (1) {
2115 // Check for error.
2116 if (SubClass.Rec == 0) return true;
2117
2118 // Get the expanded definition prototypes and teach them about
2119 // the record values the current class to inherit has
2120 for (unsigned i = 0, e = NewRecDefs.size(); i != e; ++i) {
2121 Record *CurRec = NewRecDefs[i];
2122
2123 // Add it.
2124 if (AddSubClass(CurRec, SubClass))
2125 return true;
2126
2127 // Process any variables on the let stack.
2128 for (unsigned i = 0, e = LetStack.size(); i != e; ++i)
2129 for (unsigned j = 0, e = LetStack[i].size(); j != e; ++j)
2130 if (SetValue(CurRec, LetStack[i][j].Loc, LetStack[i][j].Name,
2131 LetStack[i][j].Bits, LetStack[i][j].Value))
2132 return true;
2133 }
2134
2135 if (Lex.getCode() != tgtok::comma) break;
2136 Lex.Lex(); // eat ','.
2137 SubClass = ParseSubClassReference(0, false);
2138 }
2139 }
2140
2141 if (!CurMultiClass)
2142 for (unsigned i = 0, e = NewRecDefs.size(); i != e; ++i)
2143 // See Record::setName(). This resolve step will see any new
2144 // name for the def that might have been created when resolving
2145 // inheritance, values and arguments above.
2146 NewRecDefs[i]->resolveReferences();
2147
2148 if (Lex.getCode() != tgtok::semi)
2149 return TokError("expected ';' at end of defm");
2150 Lex.Lex();
2151
2152 return false;
2153 }
2154
2155 /// ParseObject
2156 /// Object ::= ClassInst
2157 /// Object ::= DefInst
2158 /// Object ::= MultiClassInst
2159 /// Object ::= DefMInst
2160 /// Object ::= LETCommand '{' ObjectList '}'
2161 /// Object ::= LETCommand Object
ParseObject(MultiClass * MC)2162 bool TGParser::ParseObject(MultiClass *MC) {
2163 switch (Lex.getCode()) {
2164 default:
2165 return TokError("Expected class, def, defm, multiclass or let definition");
2166 case tgtok::Let: return ParseTopLevelLet(MC);
2167 case tgtok::Def: return ParseDef(MC);
2168 case tgtok::Defm: return ParseDefm(MC);
2169 case tgtok::Class: return ParseClass();
2170 case tgtok::MultiClass: return ParseMultiClass();
2171 }
2172 }
2173
2174 /// ParseObjectList
2175 /// ObjectList :== Object*
ParseObjectList(MultiClass * MC)2176 bool TGParser::ParseObjectList(MultiClass *MC) {
2177 while (isObjectStart(Lex.getCode())) {
2178 if (ParseObject(MC))
2179 return true;
2180 }
2181 return false;
2182 }
2183
ParseFile()2184 bool TGParser::ParseFile() {
2185 Lex.Lex(); // Prime the lexer.
2186 if (ParseObjectList()) return true;
2187
2188 // If we have unread input at the end of the file, report it.
2189 if (Lex.getCode() == tgtok::Eof)
2190 return false;
2191
2192 return TokError("Unexpected input at top level");
2193 }
2194
2195