1//===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===//
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// This file implements the CodeGenInstruction class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenInstruction.h"
15#include "CodeGenTarget.h"
16#include "llvm/ADT/STLExtras.h"
17#include "llvm/ADT/StringExtras.h"
18#include "llvm/ADT/StringMap.h"
19#include "llvm/TableGen/Error.h"
20#include "llvm/TableGen/Record.h"
21#include <set>
22using namespace llvm;
23
24//===----------------------------------------------------------------------===//
25// CGIOperandList Implementation
26//===----------------------------------------------------------------------===//
27
28CGIOperandList::CGIOperandList(Record *R) : TheDef(R) {
29  isPredicable = false;
30  hasOptionalDef = false;
31  isVariadic = false;
32
33  DagInit *OutDI = R->getValueAsDag("OutOperandList");
34
35  if (DefInit *Init = dyn_cast<DefInit>(OutDI->getOperator())) {
36    if (Init->getDef()->getName() != "outs")
37      PrintFatalError(R->getName() + ": invalid def name for output list: use 'outs'");
38  } else
39    PrintFatalError(R->getName() + ": invalid output list: use 'outs'");
40
41  NumDefs = OutDI->getNumArgs();
42
43  DagInit *InDI = R->getValueAsDag("InOperandList");
44  if (DefInit *Init = dyn_cast<DefInit>(InDI->getOperator())) {
45    if (Init->getDef()->getName() != "ins")
46      PrintFatalError(R->getName() + ": invalid def name for input list: use 'ins'");
47  } else
48    PrintFatalError(R->getName() + ": invalid input list: use 'ins'");
49
50  unsigned MIOperandNo = 0;
51  std::set<std::string> OperandNames;
52  for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){
53    Init *ArgInit;
54    std::string ArgName;
55    if (i < NumDefs) {
56      ArgInit = OutDI->getArg(i);
57      ArgName = OutDI->getArgName(i);
58    } else {
59      ArgInit = InDI->getArg(i-NumDefs);
60      ArgName = InDI->getArgName(i-NumDefs);
61    }
62
63    DefInit *Arg = dyn_cast<DefInit>(ArgInit);
64    if (!Arg)
65      PrintFatalError("Illegal operand for the '" + R->getName() + "' instruction!");
66
67    Record *Rec = Arg->getDef();
68    std::string PrintMethod = "printOperand";
69    std::string EncoderMethod;
70    std::string OperandType = "OPERAND_UNKNOWN";
71    std::string OperandNamespace = "MCOI";
72    unsigned NumOps = 1;
73    DagInit *MIOpInfo = nullptr;
74    if (Rec->isSubClassOf("RegisterOperand")) {
75      PrintMethod = Rec->getValueAsString("PrintMethod");
76      OperandType = Rec->getValueAsString("OperandType");
77      OperandNamespace = Rec->getValueAsString("OperandNamespace");
78    } else if (Rec->isSubClassOf("Operand")) {
79      PrintMethod = Rec->getValueAsString("PrintMethod");
80      OperandType = Rec->getValueAsString("OperandType");
81      // If there is an explicit encoder method, use it.
82      EncoderMethod = Rec->getValueAsString("EncoderMethod");
83      MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
84
85      // Verify that MIOpInfo has an 'ops' root value.
86      if (!isa<DefInit>(MIOpInfo->getOperator()) ||
87          cast<DefInit>(MIOpInfo->getOperator())->getDef()->getName() != "ops")
88        PrintFatalError("Bad value for MIOperandInfo in operand '" + Rec->getName() +
89          "'\n");
90
91      // If we have MIOpInfo, then we have #operands equal to number of entries
92      // in MIOperandInfo.
93      if (unsigned NumArgs = MIOpInfo->getNumArgs())
94        NumOps = NumArgs;
95
96      if (Rec->isSubClassOf("PredicateOp"))
97        isPredicable = true;
98      else if (Rec->isSubClassOf("OptionalDefOperand"))
99        hasOptionalDef = true;
100    } else if (Rec->getName() == "variable_ops") {
101      isVariadic = true;
102      continue;
103    } else if (Rec->isSubClassOf("RegisterClass")) {
104      OperandType = "OPERAND_REGISTER";
105    } else if (!Rec->isSubClassOf("PointerLikeRegClass") &&
106               !Rec->isSubClassOf("unknown_class"))
107      PrintFatalError("Unknown operand class '" + Rec->getName() +
108        "' in '" + R->getName() + "' instruction!");
109
110    // Check that the operand has a name and that it's unique.
111    if (ArgName.empty())
112      PrintFatalError("In instruction '" + R->getName() + "', operand #" +
113                      Twine(i) + " has no name!");
114    if (!OperandNames.insert(ArgName).second)
115      PrintFatalError("In instruction '" + R->getName() + "', operand #" +
116                      Twine(i) + " has the same name as a previous operand!");
117
118    OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod, EncoderMethod,
119                                      OperandNamespace + "::" + OperandType,
120				      MIOperandNo, NumOps, MIOpInfo));
121    MIOperandNo += NumOps;
122  }
123
124
125  // Make sure the constraints list for each operand is large enough to hold
126  // constraint info, even if none is present.
127  for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
128    OperandList[i].Constraints.resize(OperandList[i].MINumOperands);
129}
130
131
132/// getOperandNamed - Return the index of the operand with the specified
133/// non-empty name.  If the instruction does not have an operand with the
134/// specified name, abort.
135///
136unsigned CGIOperandList::getOperandNamed(StringRef Name) const {
137  unsigned OpIdx;
138  if (hasOperandNamed(Name, OpIdx)) return OpIdx;
139  PrintFatalError("'" + TheDef->getName() +
140                  "' does not have an operand named '$" + Name + "'!");
141}
142
143/// hasOperandNamed - Query whether the instruction has an operand of the
144/// given name. If so, return true and set OpIdx to the index of the
145/// operand. Otherwise, return false.
146bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const {
147  assert(!Name.empty() && "Cannot search for operand with no name!");
148  for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
149    if (OperandList[i].Name == Name) {
150      OpIdx = i;
151      return true;
152    }
153  return false;
154}
155
156std::pair<unsigned,unsigned>
157CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) {
158  if (Op.empty() || Op[0] != '$')
159    PrintFatalError(TheDef->getName() + ": Illegal operand name: '" + Op + "'");
160
161  std::string OpName = Op.substr(1);
162  std::string SubOpName;
163
164  // Check to see if this is $foo.bar.
165  std::string::size_type DotIdx = OpName.find_first_of(".");
166  if (DotIdx != std::string::npos) {
167    SubOpName = OpName.substr(DotIdx+1);
168    if (SubOpName.empty())
169      PrintFatalError(TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'");
170    OpName = OpName.substr(0, DotIdx);
171  }
172
173  unsigned OpIdx = getOperandNamed(OpName);
174
175  if (SubOpName.empty()) {  // If no suboperand name was specified:
176    // If one was needed, throw.
177    if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
178        SubOpName.empty())
179      PrintFatalError(TheDef->getName() + ": Illegal to refer to"
180        " whole operand part of complex operand '" + Op + "'");
181
182    // Otherwise, return the operand.
183    return std::make_pair(OpIdx, 0U);
184  }
185
186  // Find the suboperand number involved.
187  DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
188  if (!MIOpInfo)
189    PrintFatalError(TheDef->getName() + ": unknown suboperand name in '" + Op + "'");
190
191  // Find the operand with the right name.
192  for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
193    if (MIOpInfo->getArgName(i) == SubOpName)
194      return std::make_pair(OpIdx, i);
195
196  // Otherwise, didn't find it!
197  PrintFatalError(TheDef->getName() + ": unknown suboperand name in '" + Op + "'");
198  return std::make_pair(0U, 0U);
199}
200
201static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops) {
202  // EARLY_CLOBBER: @early $reg
203  std::string::size_type wpos = CStr.find_first_of(" \t");
204  std::string::size_type start = CStr.find_first_not_of(" \t");
205  std::string Tok = CStr.substr(start, wpos - start);
206  if (Tok == "@earlyclobber") {
207    std::string Name = CStr.substr(wpos+1);
208    wpos = Name.find_first_not_of(" \t");
209    if (wpos == std::string::npos)
210      PrintFatalError("Illegal format for @earlyclobber constraint: '" + CStr + "'");
211    Name = Name.substr(wpos);
212    std::pair<unsigned,unsigned> Op = Ops.ParseOperandName(Name, false);
213
214    // Build the string for the operand
215    if (!Ops[Op.first].Constraints[Op.second].isNone())
216      PrintFatalError("Operand '" + Name + "' cannot have multiple constraints!");
217    Ops[Op.first].Constraints[Op.second] =
218    CGIOperandList::ConstraintInfo::getEarlyClobber();
219    return;
220  }
221
222  // Only other constraint is "TIED_TO" for now.
223  std::string::size_type pos = CStr.find_first_of('=');
224  assert(pos != std::string::npos && "Unrecognized constraint");
225  start = CStr.find_first_not_of(" \t");
226  std::string Name = CStr.substr(start, pos - start);
227
228  // TIED_TO: $src1 = $dst
229  wpos = Name.find_first_of(" \t");
230  if (wpos == std::string::npos)
231    PrintFatalError("Illegal format for tied-to constraint: '" + CStr + "'");
232  std::string DestOpName = Name.substr(0, wpos);
233  std::pair<unsigned,unsigned> DestOp = Ops.ParseOperandName(DestOpName, false);
234
235  Name = CStr.substr(pos+1);
236  wpos = Name.find_first_not_of(" \t");
237  if (wpos == std::string::npos)
238    PrintFatalError("Illegal format for tied-to constraint: '" + CStr + "'");
239
240  std::string SrcOpName = Name.substr(wpos);
241  std::pair<unsigned,unsigned> SrcOp = Ops.ParseOperandName(SrcOpName, false);
242  if (SrcOp > DestOp) {
243    std::swap(SrcOp, DestOp);
244    std::swap(SrcOpName, DestOpName);
245  }
246
247  unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp);
248
249  if (!Ops[DestOp.first].Constraints[DestOp.second].isNone())
250    PrintFatalError("Operand '" + DestOpName +
251      "' cannot have multiple constraints!");
252  Ops[DestOp.first].Constraints[DestOp.second] =
253    CGIOperandList::ConstraintInfo::getTied(FlatOpNo);
254}
255
256static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops) {
257  if (CStr.empty()) return;
258
259  const std::string delims(",");
260  std::string::size_type bidx, eidx;
261
262  bidx = CStr.find_first_not_of(delims);
263  while (bidx != std::string::npos) {
264    eidx = CStr.find_first_of(delims, bidx);
265    if (eidx == std::string::npos)
266      eidx = CStr.length();
267
268    ParseConstraint(CStr.substr(bidx, eidx - bidx), Ops);
269    bidx = CStr.find_first_not_of(delims, eidx);
270  }
271}
272
273void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) {
274  while (1) {
275    std::pair<StringRef, StringRef> P = getToken(DisableEncoding, " ,\t");
276    std::string OpName = P.first;
277    DisableEncoding = P.second;
278    if (OpName.empty()) break;
279
280    // Figure out which operand this is.
281    std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
282
283    // Mark the operand as not-to-be encoded.
284    if (Op.second >= OperandList[Op.first].DoNotEncode.size())
285      OperandList[Op.first].DoNotEncode.resize(Op.second+1);
286    OperandList[Op.first].DoNotEncode[Op.second] = true;
287  }
288
289}
290
291//===----------------------------------------------------------------------===//
292// CodeGenInstruction Implementation
293//===----------------------------------------------------------------------===//
294
295CodeGenInstruction::CodeGenInstruction(Record *R)
296  : TheDef(R), Operands(R), InferredFrom(nullptr) {
297  Namespace = R->getValueAsString("Namespace");
298  AsmString = R->getValueAsString("AsmString");
299
300  isReturn     = R->getValueAsBit("isReturn");
301  isBranch     = R->getValueAsBit("isBranch");
302  isIndirectBranch = R->getValueAsBit("isIndirectBranch");
303  isCompare    = R->getValueAsBit("isCompare");
304  isMoveImm    = R->getValueAsBit("isMoveImm");
305  isBitcast    = R->getValueAsBit("isBitcast");
306  isSelect     = R->getValueAsBit("isSelect");
307  isBarrier    = R->getValueAsBit("isBarrier");
308  isCall       = R->getValueAsBit("isCall");
309  canFoldAsLoad = R->getValueAsBit("canFoldAsLoad");
310  isPredicable = Operands.isPredicable || R->getValueAsBit("isPredicable");
311  isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
312  isCommutable = R->getValueAsBit("isCommutable");
313  isTerminator = R->getValueAsBit("isTerminator");
314  isReMaterializable = R->getValueAsBit("isReMaterializable");
315  hasDelaySlot = R->getValueAsBit("hasDelaySlot");
316  usesCustomInserter = R->getValueAsBit("usesCustomInserter");
317  hasPostISelHook = R->getValueAsBit("hasPostISelHook");
318  hasCtrlDep   = R->getValueAsBit("hasCtrlDep");
319  isNotDuplicable = R->getValueAsBit("isNotDuplicable");
320  isRegSequence = R->getValueAsBit("isRegSequence");
321  isExtractSubreg = R->getValueAsBit("isExtractSubreg");
322  isInsertSubreg = R->getValueAsBit("isInsertSubreg");
323
324  bool Unset;
325  mayLoad      = R->getValueAsBitOrUnset("mayLoad", Unset);
326  mayLoad_Unset = Unset;
327  mayStore     = R->getValueAsBitOrUnset("mayStore", Unset);
328  mayStore_Unset = Unset;
329  hasSideEffects = R->getValueAsBitOrUnset("hasSideEffects", Unset);
330  hasSideEffects_Unset = Unset;
331
332  isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove");
333  hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq");
334  hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq");
335  isCodeGenOnly = R->getValueAsBit("isCodeGenOnly");
336  isPseudo = R->getValueAsBit("isPseudo");
337  ImplicitDefs = R->getValueAsListOfDefs("Defs");
338  ImplicitUses = R->getValueAsListOfDefs("Uses");
339
340  // Parse Constraints.
341  ParseConstraints(R->getValueAsString("Constraints"), Operands);
342
343  // Parse the DisableEncoding field.
344  Operands.ProcessDisableEncoding(R->getValueAsString("DisableEncoding"));
345
346  // First check for a ComplexDeprecationPredicate.
347  if (R->getValue("ComplexDeprecationPredicate")) {
348    HasComplexDeprecationPredicate = true;
349    DeprecatedReason = R->getValueAsString("ComplexDeprecationPredicate");
350  } else if (RecordVal *Dep = R->getValue("DeprecatedFeatureMask")) {
351    // Check if we have a Subtarget feature mask.
352    HasComplexDeprecationPredicate = false;
353    DeprecatedReason = Dep->getValue()->getAsString();
354  } else {
355    // This instruction isn't deprecated.
356    HasComplexDeprecationPredicate = false;
357    DeprecatedReason = "";
358  }
359}
360
361/// HasOneImplicitDefWithKnownVT - If the instruction has at least one
362/// implicit def and it has a known VT, return the VT, otherwise return
363/// MVT::Other.
364MVT::SimpleValueType CodeGenInstruction::
365HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const {
366  if (ImplicitDefs.empty()) return MVT::Other;
367
368  // Check to see if the first implicit def has a resolvable type.
369  Record *FirstImplicitDef = ImplicitDefs[0];
370  assert(FirstImplicitDef->isSubClassOf("Register"));
371  const std::vector<MVT::SimpleValueType> &RegVTs =
372    TargetInfo.getRegisterVTs(FirstImplicitDef);
373  if (RegVTs.size() == 1)
374    return RegVTs[0];
375  return MVT::Other;
376}
377
378
379/// FlattenAsmStringVariants - Flatten the specified AsmString to only
380/// include text from the specified variant, returning the new string.
381std::string CodeGenInstruction::
382FlattenAsmStringVariants(StringRef Cur, unsigned Variant) {
383  std::string Res = "";
384
385  for (;;) {
386    // Find the start of the next variant string.
387    size_t VariantsStart = 0;
388    for (size_t e = Cur.size(); VariantsStart != e; ++VariantsStart)
389      if (Cur[VariantsStart] == '{' &&
390          (VariantsStart == 0 || (Cur[VariantsStart-1] != '$' &&
391                                  Cur[VariantsStart-1] != '\\')))
392        break;
393
394    // Add the prefix to the result.
395    Res += Cur.slice(0, VariantsStart);
396    if (VariantsStart == Cur.size())
397      break;
398
399    ++VariantsStart; // Skip the '{'.
400
401    // Scan to the end of the variants string.
402    size_t VariantsEnd = VariantsStart;
403    unsigned NestedBraces = 1;
404    for (size_t e = Cur.size(); VariantsEnd != e; ++VariantsEnd) {
405      if (Cur[VariantsEnd] == '}' && Cur[VariantsEnd-1] != '\\') {
406        if (--NestedBraces == 0)
407          break;
408      } else if (Cur[VariantsEnd] == '{')
409        ++NestedBraces;
410    }
411
412    // Select the Nth variant (or empty).
413    StringRef Selection = Cur.slice(VariantsStart, VariantsEnd);
414    for (unsigned i = 0; i != Variant; ++i)
415      Selection = Selection.split('|').second;
416    Res += Selection.split('|').first;
417
418    assert(VariantsEnd != Cur.size() &&
419           "Unterminated variants in assembly string!");
420    Cur = Cur.substr(VariantsEnd + 1);
421  }
422
423  return Res;
424}
425
426
427//===----------------------------------------------------------------------===//
428/// CodeGenInstAlias Implementation
429//===----------------------------------------------------------------------===//
430
431/// tryAliasOpMatch - This is a helper function for the CodeGenInstAlias
432/// constructor.  It checks if an argument in an InstAlias pattern matches
433/// the corresponding operand of the instruction.  It returns true on a
434/// successful match, with ResOp set to the result operand to be used.
435bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
436                                       Record *InstOpRec, bool hasSubOps,
437                                       ArrayRef<SMLoc> Loc, CodeGenTarget &T,
438                                       ResultOperand &ResOp) {
439  Init *Arg = Result->getArg(AliasOpNo);
440  DefInit *ADI = dyn_cast<DefInit>(Arg);
441  Record *ResultRecord = ADI ? ADI->getDef() : nullptr;
442
443  if (ADI && ADI->getDef() == InstOpRec) {
444    // If the operand is a record, it must have a name, and the record type
445    // must match up with the instruction's argument type.
446    if (Result->getArgName(AliasOpNo).empty())
447      PrintFatalError(Loc, "result argument #" + Twine(AliasOpNo) +
448                           " must have a name!");
449    ResOp = ResultOperand(Result->getArgName(AliasOpNo), ResultRecord);
450    return true;
451  }
452
453  // For register operands, the source register class can be a subclass
454  // of the instruction register class, not just an exact match.
455  if (InstOpRec->isSubClassOf("RegisterOperand"))
456    InstOpRec = InstOpRec->getValueAsDef("RegClass");
457
458  if (ADI && ADI->getDef()->isSubClassOf("RegisterOperand"))
459    ADI = ADI->getDef()->getValueAsDef("RegClass")->getDefInit();
460
461  if (ADI && ADI->getDef()->isSubClassOf("RegisterClass")) {
462    if (!InstOpRec->isSubClassOf("RegisterClass"))
463      return false;
464    if (!T.getRegisterClass(InstOpRec)
465              .hasSubClass(&T.getRegisterClass(ADI->getDef())))
466      return false;
467    ResOp = ResultOperand(Result->getArgName(AliasOpNo), ResultRecord);
468    return true;
469  }
470
471  // Handle explicit registers.
472  if (ADI && ADI->getDef()->isSubClassOf("Register")) {
473    if (InstOpRec->isSubClassOf("OptionalDefOperand")) {
474      DagInit *DI = InstOpRec->getValueAsDag("MIOperandInfo");
475      // The operand info should only have a single (register) entry. We
476      // want the register class of it.
477      InstOpRec = cast<DefInit>(DI->getArg(0))->getDef();
478    }
479
480    if (!InstOpRec->isSubClassOf("RegisterClass"))
481      return false;
482
483    if (!T.getRegisterClass(InstOpRec)
484        .contains(T.getRegBank().getReg(ADI->getDef())))
485      PrintFatalError(Loc, "fixed register " + ADI->getDef()->getName() +
486                      " is not a member of the " + InstOpRec->getName() +
487                      " register class!");
488
489    if (!Result->getArgName(AliasOpNo).empty())
490      PrintFatalError(Loc, "result fixed register argument must "
491                      "not have a name!");
492
493    ResOp = ResultOperand(ResultRecord);
494    return true;
495  }
496
497  // Handle "zero_reg" for optional def operands.
498  if (ADI && ADI->getDef()->getName() == "zero_reg") {
499
500    // Check if this is an optional def.
501    // Tied operands where the source is a sub-operand of a complex operand
502    // need to represent both operands in the alias destination instruction.
503    // Allow zero_reg for the tied portion. This can and should go away once
504    // the MC representation of things doesn't use tied operands at all.
505    //if (!InstOpRec->isSubClassOf("OptionalDefOperand"))
506    //  throw TGError(Loc, "reg0 used for result that is not an "
507    //                "OptionalDefOperand!");
508
509    ResOp = ResultOperand(static_cast<Record*>(nullptr));
510    return true;
511  }
512
513  // Literal integers.
514  if (IntInit *II = dyn_cast<IntInit>(Arg)) {
515    if (hasSubOps || !InstOpRec->isSubClassOf("Operand"))
516      return false;
517    // Integer arguments can't have names.
518    if (!Result->getArgName(AliasOpNo).empty())
519      PrintFatalError(Loc, "result argument #" + Twine(AliasOpNo) +
520                      " must not have a name!");
521    ResOp = ResultOperand(II->getValue());
522    return true;
523  }
524
525  // Bits<n> (also used for 0bxx literals)
526  if (BitsInit *BI = dyn_cast<BitsInit>(Arg)) {
527    if (hasSubOps || !InstOpRec->isSubClassOf("Operand"))
528      return false;
529    if (!BI->isComplete())
530      return false;
531    // Convert the bits init to an integer and use that for the result.
532    IntInit *II =
533      dyn_cast_or_null<IntInit>(BI->convertInitializerTo(IntRecTy::get()));
534    if (!II)
535      return false;
536    ResOp = ResultOperand(II->getValue());
537    return true;
538  }
539
540  // If both are Operands with the same MVT, allow the conversion. It's
541  // up to the user to make sure the values are appropriate, just like
542  // for isel Pat's.
543  if (InstOpRec->isSubClassOf("Operand") && ADI &&
544      ADI->getDef()->isSubClassOf("Operand")) {
545    // FIXME: What other attributes should we check here? Identical
546    // MIOperandInfo perhaps?
547    if (InstOpRec->getValueInit("Type") != ADI->getDef()->getValueInit("Type"))
548      return false;
549    ResOp = ResultOperand(Result->getArgName(AliasOpNo), ADI->getDef());
550    return true;
551  }
552
553  return false;
554}
555
556unsigned CodeGenInstAlias::ResultOperand::getMINumOperands() const {
557  if (!isRecord())
558    return 1;
559
560  Record *Rec = getRecord();
561  if (!Rec->isSubClassOf("Operand"))
562    return 1;
563
564  DagInit *MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
565  if (MIOpInfo->getNumArgs() == 0) {
566    // Unspecified, so it defaults to 1
567    return 1;
568  }
569
570  return MIOpInfo->getNumArgs();
571}
572
573CodeGenInstAlias::CodeGenInstAlias(Record *R, unsigned Variant,
574                                   CodeGenTarget &T)
575    : TheDef(R) {
576  Result = R->getValueAsDag("ResultInst");
577  AsmString = R->getValueAsString("AsmString");
578  AsmString = CodeGenInstruction::FlattenAsmStringVariants(AsmString, Variant);
579
580
581  // Verify that the root of the result is an instruction.
582  DefInit *DI = dyn_cast<DefInit>(Result->getOperator());
583  if (!DI || !DI->getDef()->isSubClassOf("Instruction"))
584    PrintFatalError(R->getLoc(),
585                    "result of inst alias should be an instruction");
586
587  ResultInst = &T.getInstruction(DI->getDef());
588
589  // NameClass - If argument names are repeated, we need to verify they have
590  // the same class.
591  StringMap<Record*> NameClass;
592  for (unsigned i = 0, e = Result->getNumArgs(); i != e; ++i) {
593    DefInit *ADI = dyn_cast<DefInit>(Result->getArg(i));
594    if (!ADI || Result->getArgName(i).empty())
595      continue;
596    // Verify we don't have something like: (someinst GR16:$foo, GR32:$foo)
597    // $foo can exist multiple times in the result list, but it must have the
598    // same type.
599    Record *&Entry = NameClass[Result->getArgName(i)];
600    if (Entry && Entry != ADI->getDef())
601      PrintFatalError(R->getLoc(), "result value $" + Result->getArgName(i) +
602                      " is both " + Entry->getName() + " and " +
603                      ADI->getDef()->getName() + "!");
604    Entry = ADI->getDef();
605  }
606
607  // Decode and validate the arguments of the result.
608  unsigned AliasOpNo = 0;
609  for (unsigned i = 0, e = ResultInst->Operands.size(); i != e; ++i) {
610
611    // Tied registers don't have an entry in the result dag unless they're part
612    // of a complex operand, in which case we include them anyways, as we
613    // don't have any other way to specify the whole operand.
614    if (ResultInst->Operands[i].MINumOperands == 1 &&
615        ResultInst->Operands[i].getTiedRegister() != -1)
616      continue;
617
618    if (AliasOpNo >= Result->getNumArgs())
619      PrintFatalError(R->getLoc(), "not enough arguments for instruction!");
620
621    Record *InstOpRec = ResultInst->Operands[i].Rec;
622    unsigned NumSubOps = ResultInst->Operands[i].MINumOperands;
623    ResultOperand ResOp(static_cast<int64_t>(0));
624    if (tryAliasOpMatch(Result, AliasOpNo, InstOpRec, (NumSubOps > 1),
625                        R->getLoc(), T, ResOp)) {
626      // If this is a simple operand, or a complex operand with a custom match
627      // class, then we can match is verbatim.
628      if (NumSubOps == 1 ||
629          (InstOpRec->getValue("ParserMatchClass") &&
630           InstOpRec->getValueAsDef("ParserMatchClass")
631             ->getValueAsString("Name") != "Imm")) {
632        ResultOperands.push_back(ResOp);
633        ResultInstOperandIndex.push_back(std::make_pair(i, -1));
634        ++AliasOpNo;
635
636      // Otherwise, we need to match each of the suboperands individually.
637      } else {
638         DagInit *MIOI = ResultInst->Operands[i].MIOperandInfo;
639         for (unsigned SubOp = 0; SubOp != NumSubOps; ++SubOp) {
640          Record *SubRec = cast<DefInit>(MIOI->getArg(SubOp))->getDef();
641
642          // Take care to instantiate each of the suboperands with the correct
643          // nomenclature: $foo.bar
644          ResultOperands.push_back(
645              ResultOperand(Result->getArgName(AliasOpNo) + "." +
646                            MIOI->getArgName(SubOp), SubRec));
647          ResultInstOperandIndex.push_back(std::make_pair(i, SubOp));
648         }
649         ++AliasOpNo;
650      }
651      continue;
652    }
653
654    // If the argument did not match the instruction operand, and the operand
655    // is composed of multiple suboperands, try matching the suboperands.
656    if (NumSubOps > 1) {
657      DagInit *MIOI = ResultInst->Operands[i].MIOperandInfo;
658      for (unsigned SubOp = 0; SubOp != NumSubOps; ++SubOp) {
659        if (AliasOpNo >= Result->getNumArgs())
660          PrintFatalError(R->getLoc(), "not enough arguments for instruction!");
661        Record *SubRec = cast<DefInit>(MIOI->getArg(SubOp))->getDef();
662        if (tryAliasOpMatch(Result, AliasOpNo, SubRec, false,
663                            R->getLoc(), T, ResOp)) {
664          ResultOperands.push_back(ResOp);
665          ResultInstOperandIndex.push_back(std::make_pair(i, SubOp));
666          ++AliasOpNo;
667        } else {
668          PrintFatalError(R->getLoc(), "result argument #" + Twine(AliasOpNo) +
669                        " does not match instruction operand class " +
670                        (SubOp == 0 ? InstOpRec->getName() :SubRec->getName()));
671        }
672      }
673      continue;
674    }
675    PrintFatalError(R->getLoc(), "result argument #" + Twine(AliasOpNo) +
676                    " does not match instruction operand class " +
677                    InstOpRec->getName());
678  }
679
680  if (AliasOpNo != Result->getNumArgs())
681    PrintFatalError(R->getLoc(), "too many operands for instruction!");
682}
683