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Diffstat (limited to 'llvm/utils/TableGen/CodeGenInstruction.cpp')
| -rw-r--r-- | llvm/utils/TableGen/CodeGenInstruction.cpp | 778 |
1 files changed, 778 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/CodeGenInstruction.cpp b/llvm/utils/TableGen/CodeGenInstruction.cpp new file mode 100644 index 000000000000..fde946d06589 --- /dev/null +++ b/llvm/utils/TableGen/CodeGenInstruction.cpp @@ -0,0 +1,778 @@ +//===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file implements the CodeGenInstruction class. +// +//===----------------------------------------------------------------------===// + +#include "CodeGenInstruction.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 <set> +using namespace llvm; + +//===----------------------------------------------------------------------===// +// CGIOperandList Implementation +//===----------------------------------------------------------------------===// + +CGIOperandList::CGIOperandList(Record *R) : TheDef(R) { + isPredicable = false; + hasOptionalDef = false; + isVariadic = false; + + DagInit *OutDI = R->getValueAsDag("OutOperandList"); + + if (DefInit *Init = dyn_cast<DefInit>(OutDI->getOperator())) { + if (Init->getDef()->getName() != "outs") + PrintFatalError(R->getLoc(), + R->getName() + + ": invalid def name for output list: use 'outs'"); + } else + PrintFatalError(R->getLoc(), + R->getName() + ": invalid output list: use 'outs'"); + + NumDefs = OutDI->getNumArgs(); + + DagInit *InDI = R->getValueAsDag("InOperandList"); + if (DefInit *Init = dyn_cast<DefInit>(InDI->getOperator())) { + if (Init->getDef()->getName() != "ins") + PrintFatalError(R->getLoc(), + R->getName() + + ": invalid def name for input list: use 'ins'"); + } else + PrintFatalError(R->getLoc(), + R->getName() + ": invalid input list: use 'ins'"); + + unsigned MIOperandNo = 0; + std::set<std::string> OperandNames; + unsigned e = InDI->getNumArgs() + OutDI->getNumArgs(); + OperandList.reserve(e); + for (unsigned i = 0; i != e; ++i){ + Init *ArgInit; + StringRef ArgName; + if (i < NumDefs) { + ArgInit = OutDI->getArg(i); + ArgName = OutDI->getArgNameStr(i); + } else { + ArgInit = InDI->getArg(i-NumDefs); + ArgName = InDI->getArgNameStr(i-NumDefs); + } + + DefInit *Arg = dyn_cast<DefInit>(ArgInit); + if (!Arg) + PrintFatalError(R->getLoc(), "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 = nullptr; + if (Rec->isSubClassOf("RegisterOperand")) { + PrintMethod = Rec->getValueAsString("PrintMethod"); + OperandType = Rec->getValueAsString("OperandType"); + OperandNamespace = Rec->getValueAsString("OperandNamespace"); + EncoderMethod = Rec->getValueAsString("EncoderMethod"); + } else if (Rec->isSubClassOf("Operand")) { + PrintMethod = Rec->getValueAsString("PrintMethod"); + OperandType = Rec->getValueAsString("OperandType"); + OperandNamespace = Rec->getValueAsString("OperandNamespace"); + // 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 (!isa<DefInit>(MIOpInfo->getOperator()) || + cast<DefInit>(MIOpInfo->getOperator())->getDef()->getName() != "ops") + PrintFatalError(R->getLoc(), + "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("PredicateOp")) + isPredicable = true; + else if (Rec->isSubClassOf("OptionalDefOperand")) + hasOptionalDef = true; + } else if (Rec->getName() == "variable_ops") { + isVariadic = true; + continue; + } else if (Rec->isSubClassOf("RegisterClass")) { + OperandType = "OPERAND_REGISTER"; + } else if (!Rec->isSubClassOf("PointerLikeRegClass") && + !Rec->isSubClassOf("unknown_class")) + PrintFatalError(R->getLoc(), "Unknown operand class '" + Rec->getName() + + "' in '" + R->getName() + + "' instruction!"); + + // Check that the operand has a name and that it's unique. + if (ArgName.empty()) + PrintFatalError(R->getLoc(), "In instruction '" + R->getName() + + "', operand #" + Twine(i) + + " has no name!"); + if (!OperandNames.insert(ArgName).second) + PrintFatalError(R->getLoc(), + "In instruction '" + R->getName() + "', operand #" + + Twine(i) + + " has the same name as a previous operand!"); + + OperandList.emplace_back(Rec, ArgName, PrintMethod, EncoderMethod, + OperandNamespace + "::" + OperandType, MIOperandNo, + NumOps, MIOpInfo); + MIOperandNo += NumOps; + } + + + // Make sure the constraints list for each operand is large enough to hold + // constraint info, even if none is present. + for (OperandInfo &OpInfo : OperandList) + OpInfo.Constraints.resize(OpInfo.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, abort. +/// +unsigned CGIOperandList::getOperandNamed(StringRef Name) const { + unsigned OpIdx; + if (hasOperandNamed(Name, OpIdx)) + return OpIdx; + PrintFatalError(TheDef->getLoc(), "'" + TheDef->getName() + + "' does not have an operand named '$" + + Name + "'!"); +} + +/// hasOperandNamed - Query whether the instruction has an operand of the +/// given name. If so, return true and set OpIdx to the index of the +/// operand. Otherwise, return false. +bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const { + assert(!Name.empty() && "Cannot search for operand with no name!"); + for (unsigned i = 0, e = OperandList.size(); i != e; ++i) + if (OperandList[i].Name == Name) { + OpIdx = i; + return true; + } + return false; +} + +std::pair<unsigned,unsigned> +CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) { + if (Op.empty() || Op[0] != '$') + PrintFatalError(TheDef->getLoc(), + 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()) + PrintFatalError(TheDef->getLoc(), + 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()) + PrintFatalError(TheDef->getLoc(), + 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) + PrintFatalError(TheDef->getLoc(), 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->getArgNameStr(i) == SubOpName) + return std::make_pair(OpIdx, i); + + // Otherwise, didn't find it! + PrintFatalError(TheDef->getLoc(), TheDef->getName() + + ": unknown suboperand name in '" + Op + + "'"); + return std::make_pair(0U, 0U); +} + +static void ParseConstraint(const std::string &CStr, CGIOperandList &Ops, + Record *Rec) { + // 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( + Rec->getLoc(), "Illegal format for @earlyclobber constraint in '" + + Rec->getName() + "': '" + CStr + "'"); + Name = Name.substr(wpos); + std::pair<unsigned,unsigned> Op = Ops.ParseOperandName(Name, false); + + // Build the string for the operand + if (!Ops[Op.first].Constraints[Op.second].isNone()) + PrintFatalError( + Rec->getLoc(), "Operand '" + Name + "' of '" + Rec->getName() + + "' 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('='); + if (pos == std::string::npos) + PrintFatalError( + Rec->getLoc(), "Unrecognized constraint '" + CStr + + "' in '" + Rec->getName() + "'"); + start = CStr.find_first_not_of(" \t"); + + // TIED_TO: $src1 = $dst + wpos = CStr.find_first_of(" \t", start); + if (wpos == std::string::npos || wpos > pos) + PrintFatalError( + Rec->getLoc(), "Illegal format for tied-to constraint in '" + + Rec->getName() + "': '" + CStr + "'"); + std::string LHSOpName = StringRef(CStr).substr(start, wpos - start); + std::pair<unsigned,unsigned> LHSOp = Ops.ParseOperandName(LHSOpName, false); + + wpos = CStr.find_first_not_of(" \t", pos + 1); + if (wpos == std::string::npos) + PrintFatalError( + Rec->getLoc(), "Illegal format for tied-to constraint: '" + CStr + "'"); + + std::string RHSOpName = StringRef(CStr).substr(wpos); + std::pair<unsigned,unsigned> RHSOp = Ops.ParseOperandName(RHSOpName, false); + + // Sort the operands into order, which should put the output one + // first. But keep the original order, for use in diagnostics. + bool FirstIsDest = (LHSOp < RHSOp); + std::pair<unsigned,unsigned> DestOp = (FirstIsDest ? LHSOp : RHSOp); + StringRef DestOpName = (FirstIsDest ? LHSOpName : RHSOpName); + std::pair<unsigned,unsigned> SrcOp = (FirstIsDest ? RHSOp : LHSOp); + StringRef SrcOpName = (FirstIsDest ? RHSOpName : LHSOpName); + + // Ensure one operand is a def and the other is a use. + if (DestOp.first >= Ops.NumDefs) + PrintFatalError( + Rec->getLoc(), "Input operands '" + LHSOpName + "' and '" + RHSOpName + + "' of '" + Rec->getName() + "' cannot be tied!"); + if (SrcOp.first < Ops.NumDefs) + PrintFatalError( + Rec->getLoc(), "Output operands '" + LHSOpName + "' and '" + RHSOpName + + "' of '" + Rec->getName() + "' cannot be tied!"); + + // The constraint has to go on the operand with higher index, i.e. + // the source one. Check there isn't another constraint there + // already. + if (!Ops[SrcOp.first].Constraints[SrcOp.second].isNone()) + PrintFatalError( + Rec->getLoc(), "Operand '" + SrcOpName + "' of '" + Rec->getName() + + "' cannot have multiple constraints!"); + + unsigned DestFlatOpNo = Ops.getFlattenedOperandNumber(DestOp); + auto NewConstraint = CGIOperandList::ConstraintInfo::getTied(DestFlatOpNo); + + // Check that the earlier operand is not the target of another tie + // before making it the target of this one. + for (const CGIOperandList::OperandInfo &Op : Ops) { + for (unsigned i = 0; i < Op.MINumOperands; i++) + if (Op.Constraints[i] == NewConstraint) + PrintFatalError( + Rec->getLoc(), "Operand '" + DestOpName + "' of '" + Rec->getName() + + "' cannot have multiple operands tied to it!"); + } + + Ops[SrcOp.first].Constraints[SrcOp.second] = NewConstraint; +} + +static void ParseConstraints(const std::string &CStr, CGIOperandList &Ops, + Record *Rec) { + 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, Rec); + bidx = CStr.find_first_not_of(delims, eidx); + } +} + +void CGIOperandList::ProcessDisableEncoding(std::string DisableEncoding) { + while (1) { + std::pair<StringRef, StringRef> P = getToken(DisableEncoding, " ,\t"); + std::string OpName = P.first; + DisableEncoding = P.second; + if (OpName.empty()) break; + + // Figure out which operand this is. + std::pair<unsigned,unsigned> 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"); + + isPreISelOpcode = R->getValueAsBit("isPreISelOpcode"); + isReturn = R->getValueAsBit("isReturn"); + isEHScopeReturn = R->getValueAsBit("isEHScopeReturn"); + isBranch = R->getValueAsBit("isBranch"); + isIndirectBranch = R->getValueAsBit("isIndirectBranch"); + isCompare = R->getValueAsBit("isCompare"); + isMoveImm = R->getValueAsBit("isMoveImm"); + isMoveReg = R->getValueAsBit("isMoveReg"); + isBitcast = R->getValueAsBit("isBitcast"); + isSelect = R->getValueAsBit("isSelect"); + isBarrier = R->getValueAsBit("isBarrier"); + isCall = R->getValueAsBit("isCall"); + isAdd = R->getValueAsBit("isAdd"); + isTrap = R->getValueAsBit("isTrap"); + canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); + isPredicable = !R->getValueAsBit("isUnpredicable") && ( + 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"); + hasNoSchedulingInfo = R->getValueAsBit("hasNoSchedulingInfo"); + FastISelShouldIgnore = R->getValueAsBit("FastISelShouldIgnore"); + variadicOpsAreDefs = R->getValueAsBit("variadicOpsAreDefs"); + + bool Unset; + mayLoad = R->getValueAsBitOrUnset("mayLoad", Unset); + mayLoad_Unset = Unset; + mayStore = R->getValueAsBitOrUnset("mayStore", Unset); + mayStore_Unset = Unset; + mayRaiseFPException = R->getValueAsBit("mayRaiseFPException"); + 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"); + + // This flag is only inferred from the pattern. + hasChain = false; + hasChain_Inferred = false; + + // Parse Constraints. + ParseConstraints(R->getValueAsString("Constraints"), Operands, R); + + // 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<ValueTypeByHwMode> &RegVTs = + TargetInfo.getRegisterVTs(FirstImplicitDef); + if (RegVTs.size() == 1 && RegVTs[0].isSimple()) + return RegVTs[0].getSimple().SimpleTy; + 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; +} + +bool CodeGenInstruction::isOperandAPointer(unsigned i) const { + if (DagInit *ConstraintList = TheDef->getValueAsDag("InOperandList")) { + if (i < ConstraintList->getNumArgs()) { + if (DefInit *Constraint = dyn_cast<DefInit>(ConstraintList->getArg(i))) { + return Constraint->getDef()->isSubClassOf("TypedOperand") && + Constraint->getDef()->getValueAsBit("IsPointer"); + } + } + } + return false; +} + +//===----------------------------------------------------------------------===// +/// 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<SMLoc> Loc, CodeGenTarget &T, + ResultOperand &ResOp) { + Init *Arg = Result->getArg(AliasOpNo); + DefInit *ADI = dyn_cast<DefInit>(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)) + PrintFatalError(Loc, "result argument #" + Twine(AliasOpNo) + + " must have a name!"); + ResOp = ResultOperand(Result->getArgNameStr(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->getArgNameStr(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<DefInit>(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)) + 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<Record*>(nullptr)); + return true; + } + + // Literal integers. + if (IntInit *II = dyn_cast<IntInit>(Arg)) { + if (hasSubOps || !InstOpRec->isSubClassOf("Operand")) + return false; + // Integer arguments can't have names. + if (Result->getArgName(AliasOpNo)) + PrintFatalError(Loc, "result argument #" + Twine(AliasOpNo) + + " must not have a name!"); + ResOp = ResultOperand(II->getValue()); + return true; + } + + // Bits<n> (also used for 0bxx literals) + if (BitsInit *BI = dyn_cast<BitsInit>(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<IntInit>(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->getArgNameStr(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, CodeGenTarget &T) + : TheDef(R) { + Result = R->getValueAsDag("ResultInst"); + AsmString = R->getValueAsString("AsmString"); + + + // Verify that the root of the result is an instruction. + DefInit *DI = dyn_cast<DefInit>(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<Record*> NameClass; + for (unsigned i = 0, e = Result->getNumArgs(); i != e; ++i) { + DefInit *ADI = dyn_cast<DefInit>(Result->getArg(i)); + if (!ADI || !Result->getArgName(i)) + 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->getArgNameStr(i)]; + if (Entry && Entry != ADI->getDef()) + PrintFatalError(R->getLoc(), "result value $" + Result->getArgNameStr(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) { + // Tied operands of different RegisterClass should be explicit within an + // instruction's syntax and so cannot be skipped. + int TiedOpNum = ResultInst->Operands[i].getTiedRegister(); + if (ResultInst->Operands[i].Rec->getName() == + ResultInst->Operands[TiedOpNum].Rec->getName()) + 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<int64_t>(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<DefInit>(MIOI->getArg(SubOp))->getDef(); + + // Take care to instantiate each of the suboperands with the correct + // nomenclature: $foo.bar + ResultOperands.emplace_back( + Result->getArgName(AliasOpNo)->getAsUnquotedString() + "." + + MIOI->getArgName(SubOp)->getAsUnquotedString(), 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<DefInit>(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!"); +} |