utils/TableGen/CallingConvEmitter.cpp

   1 //===- CallingConvEmitter.cpp - Generate calling conventions --------------===//
   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 tablegen backend is responsible for emitting descriptions of the calling
  11 // conventions supported by this target.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "CallingConvEmitter.h"
  16 #include "Record.h"
  17 #include "CodeGenTarget.h"
  18 using namespace llvm;
  19
  20 void CallingConvEmitter::run(raw_ostream &O) {
  21   EmitSourceFileHeader("Calling Convention Implementation Fragment", O);
  22
  23   std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv");
  24
  25   // Emit prototypes for all of the CC's so that they can forward ref each
  26   // other.
  27   for (unsigned i = 0, e = CCs.size(); i != e; ++i) {
  28     O << "static bool " << CCs[i]->getName()
  29       << "(unsigned ValNo, EVT ValVT,\n"
  30       << std::string(CCs[i]->getName().size()+13, ' ')
  31       << "EVT LocVT, CCValAssign::LocInfo LocInfo,\n"
  32       << std::string(CCs[i]->getName().size()+13, ' ')
  33       << "ISD::ArgFlagsTy ArgFlags, CCState &State);\n";
  34   }
  35
  36   // Emit each calling convention description in full.
  37   for (unsigned i = 0, e = CCs.size(); i != e; ++i)
  38     EmitCallingConv(CCs[i], O);
  39 }
  40
  41
  42 void CallingConvEmitter::EmitCallingConv(Record *CC, raw_ostream &O) {
  43   ListInit *CCActions = CC->getValueAsListInit("Actions");
  44   Counter = 0;
  45
  46   O << "\n\nstatic bool " << CC->getName()
  47     << "(unsigned ValNo, EVT ValVT,\n"
  48     << std::string(CC->getName().size()+13, ' ')
  49     << "EVT LocVT, CCValAssign::LocInfo LocInfo,\n"
  50     << std::string(CC->getName().size()+13, ' ')
  51     << "ISD::ArgFlagsTy ArgFlags, CCState &State) {\n";
  52   // Emit all of the actions, in order.
  53   for (unsigned i = 0, e = CCActions->getSize(); i != e; ++i) {
  54     O << "\n";
  55     EmitAction(CCActions->getElementAsRecord(i), 2, O);
  56   }
  57
  58   O << "\n  return true;  // CC didn't match.\n";
  59   O << "}\n";
  60 }
  61
  62 void CallingConvEmitter::EmitAction(Record *Action,
  63                                     unsigned Indent, raw_ostream &O) {
  64   std::string IndentStr = std::string(Indent, ' ');
  65
  66   if (Action->isSubClassOf("CCPredicateAction")) {
  67     O << IndentStr << "if (";
  68
  69     if (Action->isSubClassOf("CCIfType")) {
  70       ListInit *VTs = Action->getValueAsListInit("VTs");
  71       for (unsigned i = 0, e = VTs->getSize(); i != e; ++i) {
  72         Record *VT = VTs->getElementAsRecord(i);
  73         if (i != 0) O << " ||\n    " << IndentStr;
  74         O << "LocVT == " << getEnumName(getValueType(VT));
  75       }
  76
  77     } else if (Action->isSubClassOf("CCIf")) {
  78       O << Action->getValueAsString("Predicate");
  79     } else {
  80       Action->dump();
  81       throw "Unknown CCPredicateAction!";
  82     }
  83
  84     O << ") {\n";
  85     EmitAction(Action->getValueAsDef("SubAction"), Indent+2, O);
  86     O << IndentStr << "}\n";
  87   } else {
  88     if (Action->isSubClassOf("CCDelegateTo")) {
  89       Record *CC = Action->getValueAsDef("CC");
  90       O << IndentStr << "if (!" << CC->getName()
  91         << "(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))\n"
  92         << IndentStr << "  return false;\n";
  93     } else if (Action->isSubClassOf("CCAssignToReg")) {
  94       ListInit *RegList = Action->getValueAsListInit("RegList");
  95       if (RegList->getSize() == 1) {
  96         O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
  97         O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n";
  98       } else {
  99         O << IndentStr << "static const unsigned RegList" << ++Counter
 100           << "[] = {\n";
 101         O << IndentStr << "  ";
 102         for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
 103           if (i != 0) O << ", ";
 104           O << getQualifiedName(RegList->getElementAsRecord(i));
 105         }
 106         O << "\n" << IndentStr << "};\n";
 107         O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
 108           << Counter << ", " << RegList->getSize() << ")) {\n";
 109       }
 110       O << IndentStr << "  State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
 111         << "Reg, LocVT, LocInfo));\n";
 112       O << IndentStr << "  return false;\n";
 113       O << IndentStr << "}\n";
 114     } else if (Action->isSubClassOf("CCAssignToRegWithShadow")) {
 115       ListInit *RegList = Action->getValueAsListInit("RegList");
 116       ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList");
 117       if (ShadowRegList->getSize() >0 &&
 118           ShadowRegList->getSize() != RegList->getSize())
 119         throw "Invalid length of list of shadowed registers";
 120
 121       if (RegList->getSize() == 1) {
 122         O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
 123         O << getQualifiedName(RegList->getElementAsRecord(0));
 124         O << ", " << getQualifiedName(ShadowRegList->getElementAsRecord(0));
 125         O << ")) {\n";
 126       } else {
 127         unsigned RegListNumber = ++Counter;
 128         unsigned ShadowRegListNumber = ++Counter;
 129
 130         O << IndentStr << "static const unsigned RegList" << RegListNumber
 131           << "[] = {\n";
 132         O << IndentStr << "  ";
 133         for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
 134           if (i != 0) O << ", ";
 135           O << getQualifiedName(RegList->getElementAsRecord(i));
 136         }
 137         O << "\n" << IndentStr << "};\n";
 138
 139         O << IndentStr << "static const unsigned RegList"
 140           << ShadowRegListNumber << "[] = {\n";
 141         O << IndentStr << "  ";
 142         for (unsigned i = 0, e = ShadowRegList->getSize(); i != e; ++i) {
 143           if (i != 0) O << ", ";
 144           O << getQualifiedName(ShadowRegList->getElementAsRecord(i));
 145         }
 146         O << "\n" << IndentStr << "};\n";
 147
 148         O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
 149           << RegListNumber << ", " << "RegList" << ShadowRegListNumber
 150           << ", " << RegList->getSize() << ")) {\n";
 151       }
 152       O << IndentStr << "  State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
 153         << "Reg, LocVT, LocInfo));\n";
 154       O << IndentStr << "  return false;\n";
 155       O << IndentStr << "}\n";
 156     } else if (Action->isSubClassOf("CCAssignToStack")) {
 157       int Size = Action->getValueAsInt("Size");
 158       int Align = Action->getValueAsInt("Align");
 159
 160       O << IndentStr << "unsigned Offset" << ++Counter
 161         << " = State.AllocateStack(";
 162       if (Size)
 163         O << Size << ", ";
 164       else
 165         O << "\n" << IndentStr << "  State.getTarget().getTargetData()"
 166           "->getTypeAllocSize(LocVT.getTypeForEVT(State.getContext())), ";
 167       if (Align)
 168         O << Align;
 169       else
 170         O << "\n" << IndentStr << "  State.getTarget().getTargetData()"
 171           "->getABITypeAlignment(LocVT.getTypeForEVT(State.getContext()))";
 172       O << ");\n" << IndentStr
 173         << "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset"
 174         << Counter << ", LocVT, LocInfo));\n";
 175       O << IndentStr << "return false;\n";
 176     } else if (Action->isSubClassOf("CCPromoteToType")) {
 177       Record *DestTy = Action->getValueAsDef("DestTy");
 178       O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
 179       O << IndentStr << "if (ArgFlags.isSExt())\n"
 180         << IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n"
 181         << IndentStr << "else if (ArgFlags.isZExt())\n"
 182         << IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
 183         << IndentStr << "else\n"
 184         << IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n";
 185     } else if (Action->isSubClassOf("CCBitConvertToType")) {
 186       Record *DestTy = Action->getValueAsDef("DestTy");
 187       O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
 188       O << IndentStr << "LocInfo = CCValAssign::BCvt;\n";
 189     } else if (Action->isSubClassOf("CCPassIndirect")) {
 190       Record *DestTy = Action->getValueAsDef("DestTy");
 191       O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
 192       O << IndentStr << "LocInfo = CCValAssign::Indirect;\n";
 193     } else if (Action->isSubClassOf("CCPassByVal")) {
 194       int Size = Action->getValueAsInt("Size");
 195       int Align = Action->getValueAsInt("Align");
 196       O << IndentStr
 197         << "State.HandleByVal(ValNo, ValVT, LocVT, LocInfo, "
 198         << Size << ", " << Align << ", ArgFlags);\n";
 199       O << IndentStr << "return false;\n";
 200     } else if (Action->isSubClassOf("CCCustom")) {
 201       O << IndentStr
 202         << "if (" << Action->getValueAsString("FuncName") << "(ValNo, ValVT, "
 203         << "LocVT, LocInfo, ArgFlags, State))\n";
 204       O << IndentStr << IndentStr << "return false;\n";
 205     } else {
 206       Action->dump();
 207       throw "Unknown CCAction!";
 208     }
 209   }
 210 }