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 "CodeGenTarget.h" 16 #include "llvm/TableGen/Error.h" 17 #include "llvm/TableGen/Record.h" 18 #include "llvm/TableGen/TableGenBackend.h" 19 #include <cassert> 20 using namespace llvm; 21 22 namespace { 23 class CallingConvEmitter { 24 RecordKeeper &Records; 25 public: 26 explicit CallingConvEmitter(RecordKeeper &R) : Records(R) {} 27 28 void run(raw_ostream &o); 29 30 private: 31 void EmitCallingConv(Record *CC, raw_ostream &O); 32 void EmitAction(Record *Action, unsigned Indent, raw_ostream &O); 33 unsigned Counter; 34 }; 35 } // End anonymous namespace 36 37 void CallingConvEmitter::run(raw_ostream &O) { 38 std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv"); 39 40 // Emit prototypes for all of the non-custom CC's so that they can forward ref 41 // each other. 42 for (Record *CC : CCs) { 43 if (!CC->getValueAsBit("Custom")) { 44 O << "static bool " << CC->getName() 45 << "(unsigned ValNo, MVT ValVT,\n" 46 << std::string(CC->getName().size() + 13, ' ') 47 << "MVT LocVT, CCValAssign::LocInfo LocInfo,\n" 48 << std::string(CC->getName().size() + 13, ' ') 49 << "ISD::ArgFlagsTy ArgFlags, CCState &State);\n"; 50 } 51 } 52 53 // Emit each non-custom calling convention description in full. 54 for (Record *CC : CCs) { 55 if (!CC->getValueAsBit("Custom")) 56 EmitCallingConv(CC, O); 57 } 58 } 59 60 61 void CallingConvEmitter::EmitCallingConv(Record *CC, raw_ostream &O) { 62 ListInit *CCActions = CC->getValueAsListInit("Actions"); 63 Counter = 0; 64 65 O << "\n\nstatic bool " << CC->getName() 66 << "(unsigned ValNo, MVT ValVT,\n" 67 << std::string(CC->getName().size()+13, ' ') 68 << "MVT LocVT, CCValAssign::LocInfo LocInfo,\n" 69 << std::string(CC->getName().size()+13, ' ') 70 << "ISD::ArgFlagsTy ArgFlags, CCState &State) {\n"; 71 // Emit all of the actions, in order. 72 for (unsigned i = 0, e = CCActions->size(); i != e; ++i) { 73 O << "\n"; 74 EmitAction(CCActions->getElementAsRecord(i), 2, O); 75 } 76 77 O << "\n return true; // CC didn't match.\n"; 78 O << "}\n"; 79 } 80 81 void CallingConvEmitter::EmitAction(Record *Action, 82 unsigned Indent, raw_ostream &O) { 83 std::string IndentStr = std::string(Indent, ' '); 84 85 if (Action->isSubClassOf("CCPredicateAction")) { 86 O << IndentStr << "if ("; 87 88 if (Action->isSubClassOf("CCIfType")) { 89 ListInit *VTs = Action->getValueAsListInit("VTs"); 90 for (unsigned i = 0, e = VTs->size(); i != e; ++i) { 91 Record *VT = VTs->getElementAsRecord(i); 92 if (i != 0) O << " ||\n " << IndentStr; 93 O << "LocVT == " << getEnumName(getValueType(VT)); 94 } 95 96 } else if (Action->isSubClassOf("CCIf")) { 97 O << Action->getValueAsString("Predicate"); 98 } else { 99 errs() << *Action; 100 PrintFatalError("Unknown CCPredicateAction!"); 101 } 102 103 O << ") {\n"; 104 EmitAction(Action->getValueAsDef("SubAction"), Indent+2, O); 105 O << IndentStr << "}\n"; 106 } else { 107 if (Action->isSubClassOf("CCDelegateTo")) { 108 Record *CC = Action->getValueAsDef("CC"); 109 O << IndentStr << "if (!" << CC->getName() 110 << "(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))\n" 111 << IndentStr << " return false;\n"; 112 } else if (Action->isSubClassOf("CCAssignToReg")) { 113 ListInit *RegList = Action->getValueAsListInit("RegList"); 114 if (RegList->size() == 1) { 115 O << IndentStr << "if (unsigned Reg = State.AllocateReg("; 116 O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n"; 117 } else { 118 O << IndentStr << "static const MCPhysReg RegList" << ++Counter 119 << "[] = {\n"; 120 O << IndentStr << " "; 121 for (unsigned i = 0, e = RegList->size(); i != e; ++i) { 122 if (i != 0) O << ", "; 123 O << getQualifiedName(RegList->getElementAsRecord(i)); 124 } 125 O << "\n" << IndentStr << "};\n"; 126 O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList" 127 << Counter << ")) {\n"; 128 } 129 O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, " 130 << "Reg, LocVT, LocInfo));\n"; 131 O << IndentStr << " return false;\n"; 132 O << IndentStr << "}\n"; 133 } else if (Action->isSubClassOf("CCAssignToRegWithShadow")) { 134 ListInit *RegList = Action->getValueAsListInit("RegList"); 135 ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList"); 136 if (!ShadowRegList->empty() && ShadowRegList->size() != RegList->size()) 137 PrintFatalError("Invalid length of list of shadowed registers"); 138 139 if (RegList->size() == 1) { 140 O << IndentStr << "if (unsigned Reg = State.AllocateReg("; 141 O << getQualifiedName(RegList->getElementAsRecord(0)); 142 O << ", " << getQualifiedName(ShadowRegList->getElementAsRecord(0)); 143 O << ")) {\n"; 144 } else { 145 unsigned RegListNumber = ++Counter; 146 unsigned ShadowRegListNumber = ++Counter; 147 148 O << IndentStr << "static const MCPhysReg RegList" << RegListNumber 149 << "[] = {\n"; 150 O << IndentStr << " "; 151 for (unsigned i = 0, e = RegList->size(); i != e; ++i) { 152 if (i != 0) O << ", "; 153 O << getQualifiedName(RegList->getElementAsRecord(i)); 154 } 155 O << "\n" << IndentStr << "};\n"; 156 157 O << IndentStr << "static const MCPhysReg RegList" 158 << ShadowRegListNumber << "[] = {\n"; 159 O << IndentStr << " "; 160 for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i) { 161 if (i != 0) O << ", "; 162 O << getQualifiedName(ShadowRegList->getElementAsRecord(i)); 163 } 164 O << "\n" << IndentStr << "};\n"; 165 166 O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList" 167 << RegListNumber << ", " << "RegList" << ShadowRegListNumber 168 << ")) {\n"; 169 } 170 O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, " 171 << "Reg, LocVT, LocInfo));\n"; 172 O << IndentStr << " return false;\n"; 173 O << IndentStr << "}\n"; 174 } else if (Action->isSubClassOf("CCAssignToStack")) { 175 int Size = Action->getValueAsInt("Size"); 176 int Align = Action->getValueAsInt("Align"); 177 178 O << IndentStr << "unsigned Offset" << ++Counter 179 << " = State.AllocateStack("; 180 if (Size) 181 O << Size << ", "; 182 else 183 O << "\n" << IndentStr 184 << " State.getMachineFunction().getDataLayout()." 185 "getTypeAllocSize(EVT(LocVT).getTypeForEVT(State.getContext()))," 186 " "; 187 if (Align) 188 O << Align; 189 else 190 O << "\n" << IndentStr 191 << " State.getMachineFunction().getDataLayout()." 192 "getABITypeAlignment(EVT(LocVT).getTypeForEVT(State.getContext()" 193 "))"; 194 O << ");\n" << IndentStr 195 << "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset" 196 << Counter << ", LocVT, LocInfo));\n"; 197 O << IndentStr << "return false;\n"; 198 } else if (Action->isSubClassOf("CCAssignToStackWithShadow")) { 199 int Size = Action->getValueAsInt("Size"); 200 int Align = Action->getValueAsInt("Align"); 201 ListInit *ShadowRegList = Action->getValueAsListInit("ShadowRegList"); 202 203 unsigned ShadowRegListNumber = ++Counter; 204 205 O << IndentStr << "static const MCPhysReg ShadowRegList" 206 << ShadowRegListNumber << "[] = {\n"; 207 O << IndentStr << " "; 208 for (unsigned i = 0, e = ShadowRegList->size(); i != e; ++i) { 209 if (i != 0) O << ", "; 210 O << getQualifiedName(ShadowRegList->getElementAsRecord(i)); 211 } 212 O << "\n" << IndentStr << "};\n"; 213 214 O << IndentStr << "unsigned Offset" << ++Counter 215 << " = State.AllocateStack(" 216 << Size << ", " << Align << ", " 217 << "ShadowRegList" << ShadowRegListNumber << ");\n"; 218 O << IndentStr << "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset" 219 << Counter << ", LocVT, LocInfo));\n"; 220 O << IndentStr << "return false;\n"; 221 } else if (Action->isSubClassOf("CCPromoteToType")) { 222 Record *DestTy = Action->getValueAsDef("DestTy"); 223 MVT::SimpleValueType DestVT = getValueType(DestTy); 224 O << IndentStr << "LocVT = " << getEnumName(DestVT) <<";\n"; 225 if (MVT(DestVT).isFloatingPoint()) { 226 O << IndentStr << "LocInfo = CCValAssign::FPExt;\n"; 227 } else { 228 O << IndentStr << "if (ArgFlags.isSExt())\n" 229 << IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n" 230 << IndentStr << "else if (ArgFlags.isZExt())\n" 231 << IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n" 232 << IndentStr << "else\n" 233 << IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n"; 234 } 235 } else if (Action->isSubClassOf("CCPromoteToUpperBitsInType")) { 236 Record *DestTy = Action->getValueAsDef("DestTy"); 237 MVT::SimpleValueType DestVT = getValueType(DestTy); 238 O << IndentStr << "LocVT = " << getEnumName(DestVT) << ";\n"; 239 if (MVT(DestVT).isFloatingPoint()) { 240 PrintFatalError("CCPromoteToUpperBitsInType does not handle floating " 241 "point"); 242 } else { 243 O << IndentStr << "if (ArgFlags.isSExt())\n" 244 << IndentStr << IndentStr << "LocInfo = CCValAssign::SExtUpper;\n" 245 << IndentStr << "else if (ArgFlags.isZExt())\n" 246 << IndentStr << IndentStr << "LocInfo = CCValAssign::ZExtUpper;\n" 247 << IndentStr << "else\n" 248 << IndentStr << IndentStr << "LocInfo = CCValAssign::AExtUpper;\n"; 249 } 250 } else if (Action->isSubClassOf("CCBitConvertToType")) { 251 Record *DestTy = Action->getValueAsDef("DestTy"); 252 O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n"; 253 O << IndentStr << "LocInfo = CCValAssign::BCvt;\n"; 254 } else if (Action->isSubClassOf("CCPassIndirect")) { 255 Record *DestTy = Action->getValueAsDef("DestTy"); 256 O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n"; 257 O << IndentStr << "LocInfo = CCValAssign::Indirect;\n"; 258 } else if (Action->isSubClassOf("CCPassByVal")) { 259 int Size = Action->getValueAsInt("Size"); 260 int Align = Action->getValueAsInt("Align"); 261 O << IndentStr 262 << "State.HandleByVal(ValNo, ValVT, LocVT, LocInfo, " 263 << Size << ", " << Align << ", ArgFlags);\n"; 264 O << IndentStr << "return false;\n"; 265 } else if (Action->isSubClassOf("CCCustom")) { 266 O << IndentStr 267 << "if (" << Action->getValueAsString("FuncName") << "(ValNo, ValVT, " 268 << "LocVT, LocInfo, ArgFlags, State))\n"; 269 O << IndentStr << IndentStr << "return false;\n"; 270 } else { 271 errs() << *Action; 272 PrintFatalError("Unknown CCAction!"); 273 } 274 } 275 } 276 277 namespace llvm { 278 279 void EmitCallingConv(RecordKeeper &RK, raw_ostream &OS) { 280 emitSourceFileHeader("Calling Convention Implementation Fragment", OS); 281 CallingConvEmitter(RK).run(OS); 282 } 283 284 } // End llvm namespace 285
