X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=utils%2FTableGen%2FCodeGenInstruction.cpp;h=e83d5033b1826c0f07a505b8f8970f30e7244366;hb=47f0e3f434e2e43f951c3a826c40906cb15b7285;hp=d421fd07c32303e8bfbdb1c73c62927953e9f9e3;hpb=799d697bf8d45ec404d0d105fc788ea5cf81c841;p=oota-llvm.git diff --git a/utils/TableGen/CodeGenInstruction.cpp b/utils/TableGen/CodeGenInstruction.cpp index d421fd07c32..e83d5033b18 100644 --- a/utils/TableGen/CodeGenInstruction.cpp +++ b/utils/TableGen/CodeGenInstruction.cpp @@ -12,264 +12,672 @@ //===----------------------------------------------------------------------===// #include "CodeGenInstruction.h" -#include "Record.h" +#include "CodeGenTarget.h" +#include "llvm/ADT/STLExtras.h" #include "llvm/ADT/StringExtras.h" +#include "llvm/ADT/StringMap.h" +#include "llvm/TableGen/Error.h" +#include "llvm/TableGen/Record.h" #include using namespace llvm; -static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) { - // FIXME: Only supports TIED_TO for now. - std::string::size_type pos = CStr.find_first_of('='); - assert(pos != std::string::npos && "Unrecognized constraint"); - std::string::size_type start = CStr.find_first_not_of(" \t"); - std::string Name = CStr.substr(start, pos - start); - - // TIED_TO: $src1 = $dst - std::string::size_type wpos = Name.find_first_of(" \t"); - if (wpos == std::string::npos) - throw "Illegal format for tied-to constraint: '" + CStr + "'"; - std::string DestOpName = Name.substr(0, wpos); - std::pair DestOp = I->ParseOperandName(DestOpName, false); - - Name = CStr.substr(pos+1); - wpos = Name.find_first_not_of(" \t"); - if (wpos == std::string::npos) - throw "Illegal format for tied-to constraint: '" + CStr + "'"; - - std::pair SrcOp = - I->ParseOperandName(Name.substr(wpos), false); - if (SrcOp > DestOp) - throw "Illegal tied-to operand constraint '" + CStr + "'"; - - - unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp); - // Build the string for the operand. - std::string OpConstraint = - "((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))"; - - - if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty()) - throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; - I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint; -} - -static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) { - // Make sure the constraints list for each operand is large enough to hold - // constraint info, even if none is present. - for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i) - I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands); - - if (CStr.empty()) return; - - const std::string delims(","); - std::string::size_type bidx, eidx; - - bidx = CStr.find_first_not_of(delims); - while (bidx != std::string::npos) { - eidx = CStr.find_first_of(delims, bidx); - if (eidx == std::string::npos) - eidx = CStr.length(); - - ParseConstraint(CStr.substr(bidx, eidx - bidx), I); - bidx = CStr.find_first_not_of(delims, eidx); - } -} - -CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr) - : TheDef(R), AsmString(AsmStr) { - Namespace = R->getValueAsString("Namespace"); +//===----------------------------------------------------------------------===// +// CGIOperandList Implementation +//===----------------------------------------------------------------------===// - isReturn = R->getValueAsBit("isReturn"); - isBranch = R->getValueAsBit("isBranch"); - isIndirectBranch = R->getValueAsBit("isIndirectBranch"); - isBarrier = R->getValueAsBit("isBarrier"); - isCall = R->getValueAsBit("isCall"); - canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); - mayLoad = R->getValueAsBit("mayLoad"); - mayStore = R->getValueAsBit("mayStore"); - bool isTwoAddress = R->getValueAsBit("isTwoAddress"); - isPredicable = R->getValueAsBit("isPredicable"); - isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress"); - isCommutable = R->getValueAsBit("isCommutable"); - isTerminator = R->getValueAsBit("isTerminator"); - isReMaterializable = R->getValueAsBit("isReMaterializable"); - hasDelaySlot = R->getValueAsBit("hasDelaySlot"); - usesCustomDAGSchedInserter = R->getValueAsBit("usesCustomDAGSchedInserter"); - hasCtrlDep = R->getValueAsBit("hasCtrlDep"); - isNotDuplicable = R->getValueAsBit("isNotDuplicable"); - hasSideEffects = R->getValueAsBit("hasSideEffects"); - mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects"); - neverHasSideEffects = R->getValueAsBit("neverHasSideEffects"); - isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove"); - hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq"); - hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq"); +CGIOperandList::CGIOperandList(Record *R) : TheDef(R) { + isPredicable = false; hasOptionalDef = false; isVariadic = false; - if (mayHaveSideEffects + neverHasSideEffects + hasSideEffects > 1) - throw R->getName() + ": multiple conflicting side-effect flags set!"; + DagInit *OutDI = R->getValueAsDag("OutOperandList"); - DagInit *DI; - try { - DI = R->getValueAsDag("OutOperandList"); - } catch (...) { - // Error getting operand list, just ignore it (sparcv9). - AsmString.clear(); - OperandList.clear(); - return; - } - NumDefs = DI->getNumArgs(); - - DagInit *IDI; - try { - IDI = R->getValueAsDag("InOperandList"); - } catch (...) { - // Error getting operand list, just ignore it (sparcv9). - AsmString.clear(); - OperandList.clear(); - return; - } - DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI, new DagRecTy))->Fold(R, 0); + if (DefInit *Init = dyn_cast(OutDI->getOperator())) { + if (Init->getDef()->getName() != "outs") + PrintFatalError(R->getName() + ": invalid def name for output list: use 'outs'"); + } else + PrintFatalError(R->getName() + ": invalid output list: use 'outs'"); + + NumDefs = OutDI->getNumArgs(); + + DagInit *InDI = R->getValueAsDag("InOperandList"); + if (DefInit *Init = dyn_cast(InDI->getOperator())) { + if (Init->getDef()->getName() != "ins") + PrintFatalError(R->getName() + ": invalid def name for input list: use 'ins'"); + } else + PrintFatalError(R->getName() + ": invalid input list: use 'ins'"); unsigned MIOperandNo = 0; std::set OperandNames; - for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) { - DefInit *Arg = dynamic_cast(DI->getArg(i)); + for (unsigned i = 0, e = InDI->getNumArgs()+OutDI->getNumArgs(); i != e; ++i){ + Init *ArgInit; + std::string ArgName; + if (i < NumDefs) { + ArgInit = OutDI->getArg(i); + ArgName = OutDI->getArgName(i); + } else { + ArgInit = InDI->getArg(i-NumDefs); + ArgName = InDI->getArgName(i-NumDefs); + } + + DefInit *Arg = dyn_cast(ArgInit); if (!Arg) - throw "Illegal operand for the '" + R->getName() + "' instruction!"; + PrintFatalError("Illegal operand for the '" + R->getName() + "' instruction!"); Record *Rec = Arg->getDef(); std::string PrintMethod = "printOperand"; + std::string EncoderMethod; + std::string OperandType = "OPERAND_UNKNOWN"; + std::string OperandNamespace = "MCOI"; unsigned NumOps = 1; - DagInit *MIOpInfo = 0; - if (Rec->isSubClassOf("Operand")) { + DagInit *MIOpInfo = nullptr; + if (Rec->isSubClassOf("RegisterOperand")) { + PrintMethod = Rec->getValueAsString("PrintMethod"); + OperandType = Rec->getValueAsString("OperandType"); + OperandNamespace = Rec->getValueAsString("OperandNamespace"); + } else if (Rec->isSubClassOf("Operand")) { PrintMethod = Rec->getValueAsString("PrintMethod"); + OperandType = Rec->getValueAsString("OperandType"); + // If there is an explicit encoder method, use it. + EncoderMethod = Rec->getValueAsString("EncoderMethod"); MIOpInfo = Rec->getValueAsDag("MIOperandInfo"); - + // Verify that MIOpInfo has an 'ops' root value. - if (!dynamic_cast(MIOpInfo->getOperator()) || - dynamic_cast(MIOpInfo->getOperator()) - ->getDef()->getName() != "ops") - throw "Bad value for MIOperandInfo in operand '" + Rec->getName() + - "'\n"; + if (!isa(MIOpInfo->getOperator()) || + cast(MIOpInfo->getOperator())->getDef()->getName() != "ops") + PrintFatalError("Bad value for MIOperandInfo in operand '" + Rec->getName() + + "'\n"); // If we have MIOpInfo, then we have #operands equal to number of entries // in MIOperandInfo. if (unsigned NumArgs = MIOpInfo->getNumArgs()) NumOps = NumArgs; - if (Rec->isSubClassOf("PredicateOperand")) + if (Rec->isSubClassOf("PredicateOp")) isPredicable = true; else if (Rec->isSubClassOf("OptionalDefOperand")) hasOptionalDef = true; } else if (Rec->getName() == "variable_ops") { isVariadic = true; continue; - } else if (!Rec->isSubClassOf("RegisterClass") && - Rec->getName() != "ptr_rc" && Rec->getName() != "unknown") - throw "Unknown operand class '" + Rec->getName() + - "' in '" + R->getName() + "' instruction!"; + } else if (Rec->isSubClassOf("RegisterClass")) { + OperandType = "OPERAND_REGISTER"; + } else if (!Rec->isSubClassOf("PointerLikeRegClass") && + !Rec->isSubClassOf("unknown_class")) + PrintFatalError("Unknown operand class '" + Rec->getName() + + "' in '" + R->getName() + "' instruction!"); // Check that the operand has a name and that it's unique. - if (DI->getArgName(i).empty()) - throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + - " has no name!"; - if (!OperandNames.insert(DI->getArgName(i)).second) - throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + - " has the same name as a previous operand!"; - - OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod, - MIOperandNo, NumOps, MIOpInfo)); - MIOperandNo += NumOps; - } + if (ArgName.empty()) + PrintFatalError("In instruction '" + R->getName() + "', operand #" + + Twine(i) + " has no name!"); + if (!OperandNames.insert(ArgName).second) + PrintFatalError("In instruction '" + R->getName() + "', operand #" + + Twine(i) + " has the same name as a previous operand!"); - // Parse Constraints. - ParseConstraints(R->getValueAsString("Constraints"), this); - - // For backward compatibility: isTwoAddress means operand 1 is tied to - // operand 0. - if (isTwoAddress) { - if (!OperandList[1].Constraints[0].empty()) - throw R->getName() + ": cannot use isTwoAddress property: instruction " - "already has constraint set!"; - OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))"; + OperandList.emplace_back(Rec, ArgName, PrintMethod, EncoderMethod, + OperandNamespace + "::" + OperandType, MIOperandNo, + NumOps, MIOpInfo); + MIOperandNo += NumOps; } - - // Any operands with unset constraints get 0 as their constraint. - for (unsigned op = 0, e = OperandList.size(); op != e; ++op) - for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j) - if (OperandList[op].Constraints[j].empty()) - OperandList[op].Constraints[j] = "0"; - - // Parse the DisableEncoding field. - std::string DisableEncoding = R->getValueAsString("DisableEncoding"); - while (1) { - std::string OpName = getToken(DisableEncoding, " ,\t"); - if (OpName.empty()) break; - // Figure out which operand this is. - std::pair Op = ParseOperandName(OpName, false); - // Mark the operand as not-to-be encoded. - if (Op.second >= OperandList[Op.first].DoNotEncode.size()) - OperandList[Op.first].DoNotEncode.resize(Op.second+1); - OperandList[Op.first].DoNotEncode[Op.second] = true; - } + // Make sure the constraints list for each operand is large enough to hold + // constraint info, even if none is present. + for (unsigned i = 0, e = OperandList.size(); i != e; ++i) + OperandList[i].Constraints.resize(OperandList[i].MINumOperands); } + /// getOperandNamed - Return the index of the operand with the specified /// non-empty name. If the instruction does not have an operand with the -/// specified name, throw an exception. +/// specified name, abort. /// -unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const { +unsigned CGIOperandList::getOperandNamed(StringRef Name) const { + unsigned OpIdx; + if (hasOperandNamed(Name, OpIdx)) return OpIdx; + PrintFatalError("'" + TheDef->getName() + + "' does not have an operand named '$" + Name + "'!"); +} + +/// hasOperandNamed - Query whether the instruction has an operand of the +/// given name. If so, return true and set OpIdx to the index of the +/// operand. Otherwise, return false. +bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const { assert(!Name.empty() && "Cannot search for operand with no name!"); for (unsigned i = 0, e = OperandList.size(); i != e; ++i) - if (OperandList[i].Name == Name) return i; - throw "Instruction '" + TheDef->getName() + - "' does not have an operand named '$" + Name + "'!"; + if (OperandList[i].Name == Name) { + OpIdx = i; + return true; + } + return false; } -std::pair -CodeGenInstruction::ParseOperandName(const std::string &Op, - bool AllowWholeOp) { +std::pair +CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) { if (Op.empty() || Op[0] != '$') - throw TheDef->getName() + ": Illegal operand name: '" + Op + "'"; - + PrintFatalError(TheDef->getName() + ": Illegal operand name: '" + Op + "'"); + std::string OpName = Op.substr(1); std::string SubOpName; - + // Check to see if this is $foo.bar. std::string::size_type DotIdx = OpName.find_first_of("."); if (DotIdx != std::string::npos) { SubOpName = OpName.substr(DotIdx+1); if (SubOpName.empty()) - throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"; + PrintFatalError(TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'"); OpName = OpName.substr(0, DotIdx); } - + unsigned OpIdx = getOperandNamed(OpName); if (SubOpName.empty()) { // If no suboperand name was specified: // If one was needed, throw. if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp && SubOpName.empty()) - throw TheDef->getName() + ": Illegal to refer to" - " whole operand part of complex operand '" + Op + "'"; - + PrintFatalError(TheDef->getName() + ": Illegal to refer to" + " whole operand part of complex operand '" + Op + "'"); + // Otherwise, return the operand. return std::make_pair(OpIdx, 0U); } - + // Find the suboperand number involved. DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo; - if (MIOpInfo == 0) - throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; - + if (!MIOpInfo) + PrintFatalError(TheDef->getName() + ": unknown suboperand name in '" + Op + "'"); + // Find the operand with the right name. for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i) if (MIOpInfo->getArgName(i) == SubOpName) return std::make_pair(OpIdx, i); // Otherwise, didn't find it! - throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'"; + PrintFatalError(TheDef->getName() + ": unknown suboperand name in '" + Op + "'"); + return std::make_pair(0U, 0U); +} + +static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops) { + // EARLY_CLOBBER: @early $reg + std::string::size_type wpos = CStr.find_first_of(" \t"); + std::string::size_type start = CStr.find_first_not_of(" \t"); + std::string Tok = CStr.substr(start, wpos - start); + if (Tok == "@earlyclobber") { + std::string Name = CStr.substr(wpos+1); + wpos = Name.find_first_not_of(" \t"); + if (wpos == std::string::npos) + PrintFatalError("Illegal format for @earlyclobber constraint: '" + CStr + "'"); + Name = Name.substr(wpos); + std::pair Op = Ops.ParseOperandName(Name, false); + + // Build the string for the operand + if (!Ops[Op.first].Constraints[Op.second].isNone()) + PrintFatalError("Operand '" + Name + "' cannot have multiple constraints!"); + Ops[Op.first].Constraints[Op.second] = + CGIOperandList::ConstraintInfo::getEarlyClobber(); + return; + } + + // Only other constraint is "TIED_TO" for now. + std::string::size_type pos = CStr.find_first_of('='); + assert(pos != std::string::npos && "Unrecognized constraint"); + start = CStr.find_first_not_of(" \t"); + std::string Name = CStr.substr(start, pos - start); + + // TIED_TO: $src1 = $dst + wpos = Name.find_first_of(" \t"); + if (wpos == std::string::npos) + PrintFatalError("Illegal format for tied-to constraint: '" + CStr + "'"); + std::string DestOpName = Name.substr(0, wpos); + std::pair DestOp = Ops.ParseOperandName(DestOpName, false); + + Name = CStr.substr(pos+1); + wpos = Name.find_first_not_of(" \t"); + if (wpos == std::string::npos) + PrintFatalError("Illegal format for tied-to constraint: '" + CStr + "'"); + + std::string SrcOpName = Name.substr(wpos); + std::pair SrcOp = Ops.ParseOperandName(SrcOpName, false); + if (SrcOp > DestOp) { + std::swap(SrcOp, DestOp); + std::swap(SrcOpName, DestOpName); + } + + unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp); + + if (!Ops[DestOp.first].Constraints[DestOp.second].isNone()) + PrintFatalError("Operand '" + DestOpName + + "' cannot have multiple constraints!"); + Ops[DestOp.first].Constraints[DestOp.second] = + CGIOperandList::ConstraintInfo::getTied(FlatOpNo); +} + +static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops) { + if (CStr.empty()) return; + + const std::string delims(","); + std::string::size_type bidx, eidx; + + bidx = CStr.find_first_not_of(delims); + while (bidx != std::string::npos) { + eidx = CStr.find_first_of(delims, bidx); + if (eidx == std::string::npos) + eidx = CStr.length(); + + ParseConstraint(CStr.substr(bidx, eidx - bidx), Ops); + bidx = CStr.find_first_not_of(delims, eidx); + } +} + +void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) { + while (1) { + std::pair P = getToken(DisableEncoding, " ,\t"); + std::string OpName = P.first; + DisableEncoding = P.second; + if (OpName.empty()) break; + + // Figure out which operand this is. + std::pair Op = ParseOperandName(OpName, false); + + // Mark the operand as not-to-be encoded. + if (Op.second >= OperandList[Op.first].DoNotEncode.size()) + OperandList[Op.first].DoNotEncode.resize(Op.second+1); + OperandList[Op.first].DoNotEncode[Op.second] = true; + } + +} + +//===----------------------------------------------------------------------===// +// CodeGenInstruction Implementation +//===----------------------------------------------------------------------===// + +CodeGenInstruction::CodeGenInstruction(Record *R) + : TheDef(R), Operands(R), InferredFrom(nullptr) { + Namespace = R->getValueAsString("Namespace"); + AsmString = R->getValueAsString("AsmString"); + + isReturn = R->getValueAsBit("isReturn"); + isBranch = R->getValueAsBit("isBranch"); + isIndirectBranch = R->getValueAsBit("isIndirectBranch"); + isCompare = R->getValueAsBit("isCompare"); + isMoveImm = R->getValueAsBit("isMoveImm"); + isBitcast = R->getValueAsBit("isBitcast"); + isSelect = R->getValueAsBit("isSelect"); + isBarrier = R->getValueAsBit("isBarrier"); + isCall = R->getValueAsBit("isCall"); + canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); + isPredicable = Operands.isPredicable || R->getValueAsBit("isPredicable"); + isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress"); + isCommutable = R->getValueAsBit("isCommutable"); + isTerminator = R->getValueAsBit("isTerminator"); + isReMaterializable = R->getValueAsBit("isReMaterializable"); + hasDelaySlot = R->getValueAsBit("hasDelaySlot"); + usesCustomInserter = R->getValueAsBit("usesCustomInserter"); + hasPostISelHook = R->getValueAsBit("hasPostISelHook"); + hasCtrlDep = R->getValueAsBit("hasCtrlDep"); + isNotDuplicable = R->getValueAsBit("isNotDuplicable"); + isRegSequence = R->getValueAsBit("isRegSequence"); + isExtractSubreg = R->getValueAsBit("isExtractSubreg"); + isInsertSubreg = R->getValueAsBit("isInsertSubreg"); + isConvergent = R->getValueAsBit("isConvergent"); + + bool Unset; + mayLoad = R->getValueAsBitOrUnset("mayLoad", Unset); + mayLoad_Unset = Unset; + mayStore = R->getValueAsBitOrUnset("mayStore", Unset); + mayStore_Unset = Unset; + hasSideEffects = R->getValueAsBitOrUnset("hasSideEffects", Unset); + hasSideEffects_Unset = Unset; + + isAsCheapAsAMove = R->getValueAsBit("isAsCheapAsAMove"); + hasExtraSrcRegAllocReq = R->getValueAsBit("hasExtraSrcRegAllocReq"); + hasExtraDefRegAllocReq = R->getValueAsBit("hasExtraDefRegAllocReq"); + isCodeGenOnly = R->getValueAsBit("isCodeGenOnly"); + isPseudo = R->getValueAsBit("isPseudo"); + ImplicitDefs = R->getValueAsListOfDefs("Defs"); + ImplicitUses = R->getValueAsListOfDefs("Uses"); + + // Parse Constraints. + ParseConstraints(R->getValueAsString("Constraints"), Operands); + + // Parse the DisableEncoding field. + Operands.ProcessDisableEncoding(R->getValueAsString("DisableEncoding")); + + // First check for a ComplexDeprecationPredicate. + if (R->getValue("ComplexDeprecationPredicate")) { + HasComplexDeprecationPredicate = true; + DeprecatedReason = R->getValueAsString("ComplexDeprecationPredicate"); + } else if (RecordVal *Dep = R->getValue("DeprecatedFeatureMask")) { + // Check if we have a Subtarget feature mask. + HasComplexDeprecationPredicate = false; + DeprecatedReason = Dep->getValue()->getAsString(); + } else { + // This instruction isn't deprecated. + HasComplexDeprecationPredicate = false; + DeprecatedReason = ""; + } +} + +/// HasOneImplicitDefWithKnownVT - If the instruction has at least one +/// implicit def and it has a known VT, return the VT, otherwise return +/// MVT::Other. +MVT::SimpleValueType CodeGenInstruction:: +HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const { + if (ImplicitDefs.empty()) return MVT::Other; + + // Check to see if the first implicit def has a resolvable type. + Record *FirstImplicitDef = ImplicitDefs[0]; + assert(FirstImplicitDef->isSubClassOf("Register")); + const std::vector &RegVTs = + TargetInfo.getRegisterVTs(FirstImplicitDef); + if (RegVTs.size() == 1) + return RegVTs[0]; + return MVT::Other; +} + + +/// FlattenAsmStringVariants - Flatten the specified AsmString to only +/// include text from the specified variant, returning the new string. +std::string CodeGenInstruction:: +FlattenAsmStringVariants(StringRef Cur, unsigned Variant) { + std::string Res = ""; + + for (;;) { + // Find the start of the next variant string. + size_t VariantsStart = 0; + for (size_t e = Cur.size(); VariantsStart != e; ++VariantsStart) + if (Cur[VariantsStart] == '{' && + (VariantsStart == 0 || (Cur[VariantsStart-1] != '$' && + Cur[VariantsStart-1] != '\\'))) + break; + + // Add the prefix to the result. + Res += Cur.slice(0, VariantsStart); + if (VariantsStart == Cur.size()) + break; + + ++VariantsStart; // Skip the '{'. + + // Scan to the end of the variants string. + size_t VariantsEnd = VariantsStart; + unsigned NestedBraces = 1; + for (size_t e = Cur.size(); VariantsEnd != e; ++VariantsEnd) { + if (Cur[VariantsEnd] == '}' && Cur[VariantsEnd-1] != '\\') { + if (--NestedBraces == 0) + break; + } else if (Cur[VariantsEnd] == '{') + ++NestedBraces; + } + + // Select the Nth variant (or empty). + StringRef Selection = Cur.slice(VariantsStart, VariantsEnd); + for (unsigned i = 0; i != Variant; ++i) + Selection = Selection.split('|').second; + Res += Selection.split('|').first; + + assert(VariantsEnd != Cur.size() && + "Unterminated variants in assembly string!"); + Cur = Cur.substr(VariantsEnd + 1); + } + + return Res; +} + + +//===----------------------------------------------------------------------===// +/// CodeGenInstAlias Implementation +//===----------------------------------------------------------------------===// + +/// tryAliasOpMatch - This is a helper function for the CodeGenInstAlias +/// constructor. It checks if an argument in an InstAlias pattern matches +/// the corresponding operand of the instruction. It returns true on a +/// successful match, with ResOp set to the result operand to be used. +bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo, + Record *InstOpRec, bool hasSubOps, + ArrayRef Loc, CodeGenTarget &T, + ResultOperand &ResOp) { + Init *Arg = Result->getArg(AliasOpNo); + DefInit *ADI = dyn_cast(Arg); + Record *ResultRecord = ADI ? ADI->getDef() : nullptr; + + if (ADI && ADI->getDef() == InstOpRec) { + // If the operand is a record, it must have a name, and the record type + // must match up with the instruction's argument type. + if (Result->getArgName(AliasOpNo).empty()) + PrintFatalError(Loc, "result argument #" + Twine(AliasOpNo) + + " must have a name!"); + ResOp = ResultOperand(Result->getArgName(AliasOpNo), ResultRecord); + return true; + } + + // For register operands, the source register class can be a subclass + // of the instruction register class, not just an exact match. + if (InstOpRec->isSubClassOf("RegisterOperand")) + InstOpRec = InstOpRec->getValueAsDef("RegClass"); + + if (ADI && ADI->getDef()->isSubClassOf("RegisterOperand")) + ADI = ADI->getDef()->getValueAsDef("RegClass")->getDefInit(); + + if (ADI && ADI->getDef()->isSubClassOf("RegisterClass")) { + if (!InstOpRec->isSubClassOf("RegisterClass")) + return false; + if (!T.getRegisterClass(InstOpRec) + .hasSubClass(&T.getRegisterClass(ADI->getDef()))) + return false; + ResOp = ResultOperand(Result->getArgName(AliasOpNo), ResultRecord); + return true; + } + + // Handle explicit registers. + if (ADI && ADI->getDef()->isSubClassOf("Register")) { + if (InstOpRec->isSubClassOf("OptionalDefOperand")) { + DagInit *DI = InstOpRec->getValueAsDag("MIOperandInfo"); + // The operand info should only have a single (register) entry. We + // want the register class of it. + InstOpRec = cast(DI->getArg(0))->getDef(); + } + + if (!InstOpRec->isSubClassOf("RegisterClass")) + return false; + + if (!T.getRegisterClass(InstOpRec) + .contains(T.getRegBank().getReg(ADI->getDef()))) + PrintFatalError(Loc, "fixed register " + ADI->getDef()->getName() + + " is not a member of the " + InstOpRec->getName() + + " register class!"); + + if (!Result->getArgName(AliasOpNo).empty()) + PrintFatalError(Loc, "result fixed register argument must " + "not have a name!"); + + ResOp = ResultOperand(ResultRecord); + return true; + } + + // Handle "zero_reg" for optional def operands. + if (ADI && ADI->getDef()->getName() == "zero_reg") { + + // Check if this is an optional def. + // Tied operands where the source is a sub-operand of a complex operand + // need to represent both operands in the alias destination instruction. + // Allow zero_reg for the tied portion. This can and should go away once + // the MC representation of things doesn't use tied operands at all. + //if (!InstOpRec->isSubClassOf("OptionalDefOperand")) + // throw TGError(Loc, "reg0 used for result that is not an " + // "OptionalDefOperand!"); + + ResOp = ResultOperand(static_cast(nullptr)); + return true; + } + + // Literal integers. + if (IntInit *II = dyn_cast(Arg)) { + if (hasSubOps || !InstOpRec->isSubClassOf("Operand")) + return false; + // Integer arguments can't have names. + if (!Result->getArgName(AliasOpNo).empty()) + PrintFatalError(Loc, "result argument #" + Twine(AliasOpNo) + + " must not have a name!"); + ResOp = ResultOperand(II->getValue()); + return true; + } + + // Bits (also used for 0bxx literals) + if (BitsInit *BI = dyn_cast(Arg)) { + if (hasSubOps || !InstOpRec->isSubClassOf("Operand")) + return false; + if (!BI->isComplete()) + return false; + // Convert the bits init to an integer and use that for the result. + IntInit *II = + dyn_cast_or_null(BI->convertInitializerTo(IntRecTy::get())); + if (!II) + return false; + ResOp = ResultOperand(II->getValue()); + return true; + } + + // If both are Operands with the same MVT, allow the conversion. It's + // up to the user to make sure the values are appropriate, just like + // for isel Pat's. + if (InstOpRec->isSubClassOf("Operand") && ADI && + ADI->getDef()->isSubClassOf("Operand")) { + // FIXME: What other attributes should we check here? Identical + // MIOperandInfo perhaps? + if (InstOpRec->getValueInit("Type") != ADI->getDef()->getValueInit("Type")) + return false; + ResOp = ResultOperand(Result->getArgName(AliasOpNo), ADI->getDef()); + return true; + } + + return false; +} + +unsigned CodeGenInstAlias::ResultOperand::getMINumOperands() const { + if (!isRecord()) + return 1; + + Record *Rec = getRecord(); + if (!Rec->isSubClassOf("Operand")) + return 1; + + DagInit *MIOpInfo = Rec->getValueAsDag("MIOperandInfo"); + if (MIOpInfo->getNumArgs() == 0) { + // Unspecified, so it defaults to 1 + return 1; + } + + return MIOpInfo->getNumArgs(); +} + +CodeGenInstAlias::CodeGenInstAlias(Record *R, unsigned Variant, + CodeGenTarget &T) + : TheDef(R) { + Result = R->getValueAsDag("ResultInst"); + AsmString = R->getValueAsString("AsmString"); + AsmString = CodeGenInstruction::FlattenAsmStringVariants(AsmString, Variant); + + + // Verify that the root of the result is an instruction. + DefInit *DI = dyn_cast(Result->getOperator()); + if (!DI || !DI->getDef()->isSubClassOf("Instruction")) + PrintFatalError(R->getLoc(), + "result of inst alias should be an instruction"); + + ResultInst = &T.getInstruction(DI->getDef()); + + // NameClass - If argument names are repeated, we need to verify they have + // the same class. + StringMap NameClass; + for (unsigned i = 0, e = Result->getNumArgs(); i != e; ++i) { + DefInit *ADI = dyn_cast(Result->getArg(i)); + if (!ADI || Result->getArgName(i).empty()) + continue; + // Verify we don't have something like: (someinst GR16:$foo, GR32:$foo) + // $foo can exist multiple times in the result list, but it must have the + // same type. + Record *&Entry = NameClass[Result->getArgName(i)]; + if (Entry && Entry != ADI->getDef()) + PrintFatalError(R->getLoc(), "result value $" + Result->getArgName(i) + + " is both " + Entry->getName() + " and " + + ADI->getDef()->getName() + "!"); + Entry = ADI->getDef(); + } + + // Decode and validate the arguments of the result. + unsigned AliasOpNo = 0; + for (unsigned i = 0, e = ResultInst->Operands.size(); i != e; ++i) { + + // Tied registers don't have an entry in the result dag unless they're part + // of a complex operand, in which case we include them anyways, as we + // don't have any other way to specify the whole operand. + if (ResultInst->Operands[i].MINumOperands == 1 && + ResultInst->Operands[i].getTiedRegister() != -1) + continue; + + if (AliasOpNo >= Result->getNumArgs()) + PrintFatalError(R->getLoc(), "not enough arguments for instruction!"); + + Record *InstOpRec = ResultInst->Operands[i].Rec; + unsigned NumSubOps = ResultInst->Operands[i].MINumOperands; + ResultOperand ResOp(static_cast(0)); + if (tryAliasOpMatch(Result, AliasOpNo, InstOpRec, (NumSubOps > 1), + R->getLoc(), T, ResOp)) { + // If this is a simple operand, or a complex operand with a custom match + // class, then we can match is verbatim. + if (NumSubOps == 1 || + (InstOpRec->getValue("ParserMatchClass") && + InstOpRec->getValueAsDef("ParserMatchClass") + ->getValueAsString("Name") != "Imm")) { + ResultOperands.push_back(ResOp); + ResultInstOperandIndex.push_back(std::make_pair(i, -1)); + ++AliasOpNo; + + // Otherwise, we need to match each of the suboperands individually. + } else { + DagInit *MIOI = ResultInst->Operands[i].MIOperandInfo; + for (unsigned SubOp = 0; SubOp != NumSubOps; ++SubOp) { + Record *SubRec = cast(MIOI->getArg(SubOp))->getDef(); + + // Take care to instantiate each of the suboperands with the correct + // nomenclature: $foo.bar + ResultOperands.emplace_back(Result->getArgName(AliasOpNo) + "." + + MIOI->getArgName(SubOp), + SubRec); + ResultInstOperandIndex.push_back(std::make_pair(i, SubOp)); + } + ++AliasOpNo; + } + continue; + } + + // If the argument did not match the instruction operand, and the operand + // is composed of multiple suboperands, try matching the suboperands. + if (NumSubOps > 1) { + DagInit *MIOI = ResultInst->Operands[i].MIOperandInfo; + for (unsigned SubOp = 0; SubOp != NumSubOps; ++SubOp) { + if (AliasOpNo >= Result->getNumArgs()) + PrintFatalError(R->getLoc(), "not enough arguments for instruction!"); + Record *SubRec = cast(MIOI->getArg(SubOp))->getDef(); + if (tryAliasOpMatch(Result, AliasOpNo, SubRec, false, + R->getLoc(), T, ResOp)) { + ResultOperands.push_back(ResOp); + ResultInstOperandIndex.push_back(std::make_pair(i, SubOp)); + ++AliasOpNo; + } else { + PrintFatalError(R->getLoc(), "result argument #" + Twine(AliasOpNo) + + " does not match instruction operand class " + + (SubOp == 0 ? InstOpRec->getName() :SubRec->getName())); + } + } + continue; + } + PrintFatalError(R->getLoc(), "result argument #" + Twine(AliasOpNo) + + " does not match instruction operand class " + + InstOpRec->getName()); + } + + if (AliasOpNo != Result->getNumArgs()) + PrintFatalError(R->getLoc(), "too many operands for instruction!"); }