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Diffstat (limited to 'contrib/llvm/utils/TableGen/CodeGenInstruction.cpp')
| -rw-r--r-- | contrib/llvm/utils/TableGen/CodeGenInstruction.cpp | 316 |
1 files changed, 316 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..99d196c --- /dev/null +++ b/contrib/llvm/utils/TableGen/CodeGenInstruction.cpp @@ -0,0 +1,316 @@ +//===- 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 "Record.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/ADT/STLExtras.h" +#include <set> +using namespace llvm; + +static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) { + // 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 = + I->ParseOperandName(Name, false); + + // Build the string for the operand + if (!I->OperandList[Op.first].Constraints[Op.second].isNone()) + throw "Operand '" + Name + "' cannot have multiple constraints!"; + I->OperandList[Op.first].Constraints[Op.second] = + CodeGenInstruction::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 = 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<unsigned,unsigned> SrcOp = + I->ParseOperandName(Name.substr(wpos), false); + if (SrcOp > DestOp) + throw "Illegal tied-to operand constraint '" + CStr + "'"; + + + unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp); + + if (!I->OperandList[DestOp.first].Constraints[DestOp.second].isNone()) + throw "Operand '" + DestOpName + "' cannot have multiple constraints!"; + I->OperandList[DestOp.first].Constraints[DestOp.second] = + CodeGenInstruction::ConstraintInfo::getTied(FlatOpNo); +} + +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"); + + 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"); + 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"); + hasOptionalDef = false; + isVariadic = false; + ImplicitDefs = R->getValueAsListOfDefs("Defs"); + ImplicitUses = R->getValueAsListOfDefs("Uses"); + + if (neverHasSideEffects + hasSideEffects > 1) + throw R->getName() + ": multiple conflicting side-effect flags set!"; + + 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"; + unsigned NumOps = 1; + DagInit *MIOpInfo = 0; + if (Rec->isSubClassOf("Operand")) { + PrintMethod = Rec->getValueAsString("PrintMethod"); + 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") && + Rec->getName() != "ptr_rc" && 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, + MIOperandNo, NumOps, MIOpInfo)); + MIOperandNo += NumOps; + } + + // 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].isNone()) + throw R->getName() + ": cannot use isTwoAddress property: instruction " + "already has constraint set!"; + OperandList[1].Constraints[0] = + CodeGenInstruction::ConstraintInfo::getTied(0); + } + + // Parse the DisableEncoding field. + std::string DisableEncoding = R->getValueAsString("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; + } +} + +/// 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 CodeGenInstruction::getOperandNamed(const std::string &Name) 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 + "'!"; +} + +std::pair<unsigned,unsigned> +CodeGenInstruction::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 + "'"; +} + + +/// 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; +} + |
