utils/TableGen/CodeGenInstruction.cpp

   1 //===- CodeGenInstruction.cpp - CodeGen Instruction Class Wrapper ---------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the CodeGenInstruction class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "CodeGenInstruction.h"
  15 #include "Record.h"
  16 #include "llvm/ADT/StringExtras.h"
  17 #include <set>
  18 using namespace llvm;
  19
  20 static void ParseConstraint(const std::string &CStr, CodeGenInstruction *I) {
  21   // FIXME: Only supports TIED_TO for now.
  22   std::string::size_type pos = CStr.find_first_of('=');
  23   assert(pos != std::string::npos && "Unrecognized constraint");
  24   std::string Name = CStr.substr(0, pos);
  25
  26   // TIED_TO: $src1 = $dst
  27   std::string::size_type wpos = Name.find_first_of(" \t");
  28   if (wpos == std::string::npos)
  29     throw "Illegal format for tied-to constraint: '" + CStr + "'";
  30   std::string DestOpName = Name.substr(0, wpos);
  31   std::pair<unsigned,unsigned> DestOp = I->ParseOperandName(DestOpName, false);
  32
  33   Name = CStr.substr(pos+1);
  34   wpos = Name.find_first_not_of(" \t");
  35   if (wpos == std::string::npos)
  36     throw "Illegal format for tied-to constraint: '" + CStr + "'";
  37
  38   std::pair<unsigned,unsigned> SrcOp =
  39   I->ParseOperandName(Name.substr(wpos), false);
  40   if (SrcOp > DestOp)
  41     throw "Illegal tied-to operand constraint '" + CStr + "'";
  42
  43
  44   unsigned FlatOpNo = I->getFlattenedOperandNumber(SrcOp);
  45   // Build the string for the operand.
  46   std::string OpConstraint =
  47   "((" + utostr(FlatOpNo) + " << 16) | (1 << TOI::TIED_TO))";
  48
  49
  50   if (!I->OperandList[DestOp.first].Constraints[DestOp.second].empty())
  51     throw "Operand '" + DestOpName + "' cannot have multiple constraints!";
  52   I->OperandList[DestOp.first].Constraints[DestOp.second] = OpConstraint;
  53 }
  54
  55 static void ParseConstraints(const std::string &CStr, CodeGenInstruction *I) {
  56   // Make sure the constraints list for each operand is large enough to hold
  57   // constraint info, even if none is present.
  58   for (unsigned i = 0, e = I->OperandList.size(); i != e; ++i)
  59     I->OperandList[i].Constraints.resize(I->OperandList[i].MINumOperands);
  60
  61   if (CStr.empty()) return;
  62
  63   const std::string delims(",");
  64   std::string::size_type bidx, eidx;
  65
  66   bidx = CStr.find_first_not_of(delims);
  67   while (bidx != std::string::npos) {
  68     eidx = CStr.find_first_of(delims, bidx);
  69     if (eidx == std::string::npos)
  70       eidx = CStr.length();
  71
  72     ParseConstraint(CStr.substr(bidx, eidx), I);
  73     bidx = CStr.find_first_not_of(delims, eidx);
  74   }
  75 }
  76
  77 CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
  78   : TheDef(R), AsmString(AsmStr) {
  79   Namespace = R->getValueAsString("Namespace");
  80
  81   isReturn     = R->getValueAsBit("isReturn");
  82   isBranch     = R->getValueAsBit("isBranch");
  83   isIndirectBranch = R->getValueAsBit("isIndirectBranch");
  84   isBarrier    = R->getValueAsBit("isBarrier");
  85   isCall       = R->getValueAsBit("isCall");
  86   isSimpleLoad = R->getValueAsBit("isSimpleLoad");
  87   mayLoad      = R->getValueAsBit("mayLoad");
  88   mayStore     = R->getValueAsBit("mayStore");
  89   isImplicitDef= R->getValueAsBit("isImplicitDef");
  90   bool isTwoAddress = R->getValueAsBit("isTwoAddress");
  91   isPredicable = R->getValueAsBit("isPredicable");
  92   isConvertibleToThreeAddress = R->getValueAsBit("isConvertibleToThreeAddress");
  93   isCommutable = R->getValueAsBit("isCommutable");
  94   isTerminator = R->getValueAsBit("isTerminator");
  95   isReMaterializable = R->getValueAsBit("isReMaterializable");
  96   hasDelaySlot = R->getValueAsBit("hasDelaySlot");
  97   usesCustomDAGSchedInserter = R->getValueAsBit("usesCustomDAGSchedInserter");
  98   hasCtrlDep   = R->getValueAsBit("hasCtrlDep");
  99   isNotDuplicable = R->getValueAsBit("isNotDuplicable");
 100   hasSideEffects = R->getValueAsBit("hasSideEffects");
 101   mayHaveSideEffects = R->getValueAsBit("mayHaveSideEffects");
 102   neverHasSideEffects = R->getValueAsBit("neverHasSideEffects");
 103   hasOptionalDef = false;
 104   isVariadic = false;
 105
 106   if (mayHaveSideEffects + neverHasSideEffects + hasSideEffects > 1)
 107     throw R->getName() + ": multiple conflicting side-effect flags set!";
 108
 109   DagInit *DI;
 110   try {
 111     DI = R->getValueAsDag("OutOperandList");
 112   } catch (...) {
 113     // Error getting operand list, just ignore it (sparcv9).
 114     AsmString.clear();
 115     OperandList.clear();
 116     return;
 117   }
 118   NumDefs = DI->getNumArgs();
 119
 120   DagInit *IDI;
 121   try {
 122     IDI = R->getValueAsDag("InOperandList");
 123   } catch (...) {
 124     // Error getting operand list, just ignore it (sparcv9).
 125     AsmString.clear();
 126     OperandList.clear();
 127     return;
 128   }
 129   DI = (DagInit*)(new BinOpInit(BinOpInit::CONCAT, DI, IDI))->Fold();
 130
 131   unsigned MIOperandNo = 0;
 132   std::set<std::string> OperandNames;
 133   for (unsigned i = 0, e = DI->getNumArgs(); i != e; ++i) {
 134     DefInit *Arg = dynamic_cast<DefInit*>(DI->getArg(i));
 135     if (!Arg)
 136       throw "Illegal operand for the '" + R->getName() + "' instruction!";
 137
 138     Record *Rec = Arg->getDef();
 139     std::string PrintMethod = "printOperand";
 140     unsigned NumOps = 1;
 141     DagInit *MIOpInfo = 0;
 142     if (Rec->isSubClassOf("Operand")) {
 143       PrintMethod = Rec->getValueAsString("PrintMethod");
 144       MIOpInfo = Rec->getValueAsDag("MIOperandInfo");
 145
 146       // Verify that MIOpInfo has an 'ops' root value.
 147       if (!dynamic_cast<DefInit*>(MIOpInfo->getOperator()) ||
 148           dynamic_cast<DefInit*>(MIOpInfo->getOperator())
 149                ->getDef()->getName() != "ops")
 150         throw "Bad value for MIOperandInfo in operand '" + Rec->getName() +
 151               "'\n";
 152
 153       // If we have MIOpInfo, then we have #operands equal to number of entries
 154       // in MIOperandInfo.
 155       if (unsigned NumArgs = MIOpInfo->getNumArgs())
 156         NumOps = NumArgs;
 157
 158       if (Rec->isSubClassOf("PredicateOperand"))
 159         isPredicable = true;
 160       else if (Rec->isSubClassOf("OptionalDefOperand"))
 161         hasOptionalDef = true;
 162     } else if (Rec->getName() == "variable_ops") {
 163       isVariadic = true;
 164       continue;
 165     } else if (!Rec->isSubClassOf("RegisterClass") &&
 166                Rec->getName() != "ptr_rc")
 167       throw "Unknown operand class '" + Rec->getName() +
 168             "' in instruction '" + R->getName() + "' instruction!";
 169
 170     // Check that the operand has a name and that it's unique.
 171     if (DI->getArgName(i).empty())
 172       throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
 173         " has no name!";
 174     if (!OperandNames.insert(DI->getArgName(i)).second)
 175       throw "In instruction '" + R->getName() + "', operand #" + utostr(i) +
 176         " has the same name as a previous operand!";
 177
 178     OperandList.push_back(OperandInfo(Rec, DI->getArgName(i), PrintMethod,
 179                                       MIOperandNo, NumOps, MIOpInfo));
 180     MIOperandNo += NumOps;
 181   }
 182
 183   // Parse Constraints.
 184   ParseConstraints(R->getValueAsString("Constraints"), this);
 185
 186   // For backward compatibility: isTwoAddress means operand 1 is tied to
 187   // operand 0.
 188   if (isTwoAddress) {
 189     if (!OperandList[1].Constraints[0].empty())
 190       throw R->getName() + ": cannot use isTwoAddress property: instruction "
 191             "already has constraint set!";
 192     OperandList[1].Constraints[0] = "((0 << 16) | (1 << TOI::TIED_TO))";
 193   }
 194
 195   // Any operands with unset constraints get 0 as their constraint.
 196   for (unsigned op = 0, e = OperandList.size(); op != e; ++op)
 197     for (unsigned j = 0, e = OperandList[op].MINumOperands; j != e; ++j)
 198       if (OperandList[op].Constraints[j].empty())
 199         OperandList[op].Constraints[j] = "0";
 200
 201   // Parse the DisableEncoding field.
 202   std::string DisableEncoding = R->getValueAsString("DisableEncoding");
 203   while (1) {
 204     std::string OpName = getToken(DisableEncoding, " ,\t");
 205     if (OpName.empty()) break;
 206
 207     // Figure out which operand this is.
 208     std::pair<unsigned,unsigned> Op = ParseOperandName(OpName, false);
 209
 210     // Mark the operand as not-to-be encoded.
 211     if (Op.second >= OperandList[Op.first].DoNotEncode.size())
 212       OperandList[Op.first].DoNotEncode.resize(Op.second+1);
 213     OperandList[Op.first].DoNotEncode[Op.second] = true;
 214   }
 215 }
 216
 217 /// getOperandNamed - Return the index of the operand with the specified
 218 /// non-empty name.  If the instruction does not have an operand with the
 219 /// specified name, throw an exception.
 220 ///
 221 unsigned CodeGenInstruction::getOperandNamed(const std::string &Name) const {
 222   assert(!Name.empty() && "Cannot search for operand with no name!");
 223   for (unsigned i = 0, e = OperandList.size(); i != e; ++i)
 224     if (OperandList[i].Name == Name) return i;
 225   throw "Instruction '" + TheDef->getName() +
 226         "' does not have an operand named '$" + Name + "'!";
 227 }
 228
 229 std::pair<unsigned,unsigned>
 230 CodeGenInstruction::ParseOperandName(const std::string &Op,
 231                                      bool AllowWholeOp) {
 232   if (Op.empty() || Op[0] != '$')
 233     throw TheDef->getName() + ": Illegal operand name: '" + Op + "'";
 234
 235   std::string OpName = Op.substr(1);
 236   std::string SubOpName;
 237
 238   // Check to see if this is $foo.bar.
 239   std::string::size_type DotIdx = OpName.find_first_of(".");
 240   if (DotIdx != std::string::npos) {
 241     SubOpName = OpName.substr(DotIdx+1);
 242     if (SubOpName.empty())
 243       throw TheDef->getName() + ": illegal empty suboperand name in '" +Op +"'";
 244     OpName = OpName.substr(0, DotIdx);
 245   }
 246
 247   unsigned OpIdx = getOperandNamed(OpName);
 248
 249   if (SubOpName.empty()) {  // If no suboperand name was specified:
 250     // If one was needed, throw.
 251     if (OperandList[OpIdx].MINumOperands > 1 && !AllowWholeOp &&
 252         SubOpName.empty())
 253       throw TheDef->getName() + ": Illegal to refer to"
 254             " whole operand part of complex operand '" + Op + "'";
 255
 256     // Otherwise, return the operand.
 257     return std::make_pair(OpIdx, 0U);
 258   }
 259
 260   // Find the suboperand number involved.
 261   DagInit *MIOpInfo = OperandList[OpIdx].MIOperandInfo;
 262   if (MIOpInfo == 0)
 263     throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
 264
 265   // Find the operand with the right name.
 266   for (unsigned i = 0, e = MIOpInfo->getNumArgs(); i != e; ++i)
 267     if (MIOpInfo->getArgName(i) == SubOpName)
 268       return std::make_pair(OpIdx, i);
 269
 270   // Otherwise, didn't find it!
 271   throw TheDef->getName() + ": unknown suboperand name in '" + Op + "'";
 272 }