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Diffstat (limited to 'contrib/llvm/utils/TableGen/CodeGenInstruction.cpp')
| -rw-r--r-- | contrib/llvm/utils/TableGen/CodeGenInstruction.cpp | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/contrib/llvm/utils/TableGen/CodeGenInstruction.cpp b/contrib/llvm/utils/TableGen/CodeGenInstruction.cpp new file mode 100644 index 0000000..a52ce86 --- /dev/null +++ b/contrib/llvm/utils/TableGen/CodeGenInstruction.cpp @@ -0,0 +1,551 @@ +//===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the CodeGenInstruction class. +// +//===----------------------------------------------------------------------===// + +#include "CodeGenInstruction.h" +#include "CodeGenTarget.h" +#include "Error.h" +#include "Record.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/ADT/StringMap.h" +#include "llvm/ADT/STLExtras.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 = dynamic_cast<DefInit*>(OutDI->getOperator())) { + if (Init->getDef()->getName() != "outs") + throw R->getName() + ": invalid def name for output list: use 'outs'"; + } else + throw R->getName() + ": invalid output list: use 'outs'"; + + NumDefs = OutDI->getNumArgs(); + + DagInit *InDI = R->getValueAsDag("InOperandList"); + if (DefInit *Init = dynamic_cast<DefInit*>(InDI->getOperator())) { + if (Init->getDef()->getName() != "ins") + throw R->getName() + ": invalid def name for input list: use 'ins'"; + } else + throw R->getName() + ": invalid input list: use 'ins'"; + + unsigned MIOperandNo = 0; + std::set<std::string> OperandNames; + 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 = dynamic_cast<DefInit*>(ArgInit); + if (!Arg) + throw "Illegal operand for the '" + R->getName() + "' instruction!"; + + Record *Rec = Arg->getDef(); + std::string PrintMethod = "printOperand"; + std::string EncoderMethod; + std::string OperandType = "OPERAND_UNKNOWN"; + unsigned NumOps = 1; + DagInit *MIOpInfo = 0; + if (Rec->isSubClassOf("RegisterOperand")) { + PrintMethod = Rec->getValueAsString("PrintMethod"); + } 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<DefInit*>(MIOpInfo->getOperator()) || + dynamic_cast<DefInit*>(MIOpInfo->getOperator()) + ->getDef()->getName() != "ops") + throw "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")) + 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->getName() != "unknown") + throw "Unknown operand class '" + Rec->getName() + + "' in '" + R->getName() + "' instruction!"; + + // Check that the operand has a name and that it's unique. + if (ArgName.empty()) + throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + + " has no name!"; + if (!OperandNames.insert(ArgName).second) + throw "In instruction '" + R->getName() + "', operand #" + utostr(i) + + " has the same name as a previous operand!"; + + OperandList.push_back(OperandInfo(Rec, ArgName, PrintMethod, EncoderMethod, + 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 (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. +/// +unsigned CGIOperandList::getOperandNamed(StringRef Name) const { + unsigned OpIdx; + if (hasOperandNamed(Name, OpIdx)) return OpIdx; + throw "'" + TheDef->getName() + "' does not have an operand named '$" + + Name.str() + "'!"; +} + +/// hasOperandNamed - Query whether the instruction has an operand of the +/// given name. If so, return true and set OpIdx to the index of the +/// operand. Otherwise, return false. +bool CGIOperandList::hasOperandNamed(StringRef Name, unsigned &OpIdx) const { + assert(!Name.empty() && "Cannot search for operand with no name!"); + for (unsigned i = 0, e = OperandList.size(); i != e; ++i) + if (OperandList[i].Name == Name) { + OpIdx = i; + return true; + } + return false; +} + +std::pair<unsigned,unsigned> +CGIOperandList::ParseOperandName(const std::string &Op, bool AllowWholeOp) { + if (Op.empty() || Op[0] != '$') + throw 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 +"'"; + 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 + "'"; + + // 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 + "'"; + + // 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 + "'"; +} + +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) + throw "Illegal format for @earlyclobber constraint: '" + 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()) + throw "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) + throw "Illegal format for tied-to constraint: '" + CStr + "'"; + std::string DestOpName = Name.substr(0, wpos); + std::pair<unsigned,unsigned> DestOp = Ops.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<unsigned,unsigned> SrcOp = + Ops.ParseOperandName(Name.substr(wpos), false); + if (SrcOp > DestOp) + throw "Illegal tied-to operand constraint '" + CStr + "'"; + + + unsigned FlatOpNo = Ops.getFlattenedOperandNumber(SrcOp); + + if (!Ops[DestOp.first].Constraints[DestOp.second].isNone()) + throw "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::string OpName; + tie(OpName, DisableEncoding) = getToken(DisableEncoding, " ,\t"); + 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) { + 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"); + isBarrier = R->getValueAsBit("isBarrier"); + isCall = R->getValueAsBit("isCall"); + canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); + mayLoad = R->getValueAsBit("mayLoad"); + mayStore = R->getValueAsBit("mayStore"); + 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"); + hasCtrlDep = R->getValueAsBit("hasCtrlDep"); + isNotDuplicable = R->getValueAsBit("isNotDuplicable"); + hasSideEffects = R->getValueAsBit("hasSideEffects"); + neverHasSideEffects = R->getValueAsBit("neverHasSideEffects"); + 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"); + + if (neverHasSideEffects + hasSideEffects > 1) + throw R->getName() + ": multiple conflicting side-effect flags set!"; + + // Parse Constraints. + ParseConstraints(R->getValueAsString("Constraints"), Operands); + + // Parse the DisableEncoding field. + Operands.ProcessDisableEncoding(R->getValueAsString("DisableEncoding")); +} + +/// 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<MVT::SimpleValueType> &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, + SMLoc Loc, CodeGenTarget &T, + ResultOperand &ResOp) { + Init *Arg = Result->getArg(AliasOpNo); + DefInit *ADI = dynamic_cast<DefInit*>(Arg); + + 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()) + throw TGError(Loc, "result argument #" + utostr(AliasOpNo) + + " must have a name!"); + ResOp = ResultOperand(Result->getArgName(AliasOpNo), ADI->getDef()); + return true; + } + + // Handle explicit registers. + if (ADI && ADI->getDef()->isSubClassOf("Register")) { + if (InstOpRec->isSubClassOf("RegisterOperand")) + InstOpRec = InstOpRec->getValueAsDef("RegClass"); + + if (!InstOpRec->isSubClassOf("RegisterClass")) + return false; + + if (!T.getRegisterClass(InstOpRec) + .contains(T.getRegBank().getReg(ADI->getDef()))) + throw TGError(Loc, "fixed register " +ADI->getDef()->getName() + + " is not a member of the " + InstOpRec->getName() + + " register class!"); + + if (!Result->getArgName(AliasOpNo).empty()) + throw TGError(Loc, "result fixed register argument must " + "not have a name!"); + + ResOp = ResultOperand(ADI->getDef()); + return true; + } + + // Handle "zero_reg" for optional def operands. + if (ADI && ADI->getDef()->getName() == "zero_reg") { + + // Check if this is an optional def. + if (!InstOpRec->isSubClassOf("OptionalDefOperand")) + throw TGError(Loc, "reg0 used for result that is not an " + "OptionalDefOperand!"); + + ResOp = ResultOperand(static_cast<Record*>(0)); + return true; + } + + if (IntInit *II = dynamic_cast<IntInit*>(Arg)) { + if (hasSubOps || !InstOpRec->isSubClassOf("Operand")) + return false; + // Integer arguments can't have names. + if (!Result->getArgName(AliasOpNo).empty()) + throw TGError(Loc, "result argument #" + utostr(AliasOpNo) + + " must not have a name!"); + ResOp = ResultOperand(II->getValue()); + return true; + } + + return false; +} + +CodeGenInstAlias::CodeGenInstAlias(Record *R, CodeGenTarget &T) : TheDef(R) { + AsmString = R->getValueAsString("AsmString"); + Result = R->getValueAsDag("ResultInst"); + + // Verify that the root of the result is an instruction. + DefInit *DI = dynamic_cast<DefInit*>(Result->getOperator()); + if (DI == 0 || !DI->getDef()->isSubClassOf("Instruction")) + throw TGError(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 = dynamic_cast<DefInit*>(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()) + throw TGError(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. + if (ResultInst->Operands[i].getTiedRegister() != -1) + continue; + + if (AliasOpNo >= Result->getNumArgs()) + throw TGError(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)) { + ResultOperands.push_back(ResOp); + ResultInstOperandIndex.push_back(std::make_pair(i, -1)); + ++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()) + throw TGError(R->getLoc(), "not enough arguments for instruction!"); + Record *SubRec = dynamic_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 { + throw TGError(R->getLoc(), "result argument #" + utostr(AliasOpNo) + + " does not match instruction operand class " + + (SubOp == 0 ? InstOpRec->getName() :SubRec->getName())); + } + } + continue; + } + throw TGError(R->getLoc(), "result argument #" + utostr(AliasOpNo) + + " does not match instruction operand class " + + InstOpRec->getName()); + } + + if (AliasOpNo != Result->getNumArgs()) + throw TGError(R->getLoc(), "too many operands for instruction!"); +} |
