| //===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This tablegen backend is responsible for emitting a description of a target |
| // register file for a code generator. It uses instances of the Register, |
| // RegisterAliases, and RegisterClass classes to gather this information. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "RegisterInfoEmitter.h" |
| #include "CodeGenWrappers.h" |
| #include "Record.h" |
| #include "Support/StringExtras.h" |
| #include <set> |
| |
| namespace llvm { |
| |
| // runEnums - Print out enum values for all of the registers. |
| void RegisterInfoEmitter::runEnums(std::ostream &OS) { |
| std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register"); |
| |
| if (Registers.size() == 0) |
| throw std::string("No 'Register' subclasses defined!"); |
| |
| std::string Namespace = Registers[0]->getValueAsString("Namespace"); |
| |
| EmitSourceFileHeader("Target Register Enum Values", OS); |
| |
| if (!Namespace.empty()) |
| OS << "namespace " << Namespace << " {\n"; |
| OS << " enum {\n NoRegister,\n"; |
| |
| for (unsigned i = 0, e = Registers.size(); i != e; ++i) |
| OS << " " << Registers[i]->getName() << ", \t// " << i+1 << "\n"; |
| |
| OS << " };\n"; |
| if (!Namespace.empty()) |
| OS << "}\n"; |
| EmitSourceFileTail(OS); |
| } |
| |
| void RegisterInfoEmitter::runHeader(std::ostream &OS) { |
| EmitSourceFileHeader("Register Information Header Fragment", OS); |
| const std::string &TargetName = CodeGenTarget().getName(); |
| std::string ClassName = TargetName + "GenRegisterInfo"; |
| |
| OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n"; |
| |
| OS << "struct " << ClassName << " : public MRegisterInfo {\n" |
| << " " << ClassName |
| << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n" |
| << " const unsigned* getCalleeSaveRegs() const;\n" |
| << "};\n\n"; |
| |
| std::vector<Record*> RegisterClasses = |
| Records.getAllDerivedDefinitions("RegisterClass"); |
| |
| OS << "namespace " << TargetName << " { // Register classes\n"; |
| for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) { |
| if (RegisterClasses[i]->getValueAsBit("isDummyClass")) |
| continue; // Ignore dummies |
| |
| const std::string &Name = RegisterClasses[i]->getName(); |
| if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes |
| OS << " extern TargetRegisterClass *" << Name << "RegisterClass;\n"; |
| } |
| OS << "} // end of namespace " << TargetName << "\n\n"; |
| EmitSourceFileTail(OS); |
| } |
| |
| // RegisterInfoEmitter::run - Main register file description emitter. |
| // |
| void RegisterInfoEmitter::run(std::ostream &OS) { |
| EmitSourceFileHeader("Register Information Source Fragment", OS); |
| |
| // Start out by emitting each of the register classes... to do this, we build |
| // a set of registers which belong to a register class, this is to ensure that |
| // each register is only in a single register class. |
| // |
| std::vector<Record*> RegisterClasses = |
| Records.getAllDerivedDefinitions("RegisterClass"); |
| |
| std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register"); |
| |
| std::set<Record*> RegistersFound; |
| std::vector<std::string> RegClassNames; |
| |
| // Loop over all of the register classes... emitting each one. |
| OS << "namespace { // Register classes...\n"; |
| |
| for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) { |
| Record *RC = RegisterClasses[rc]; |
| if (RC->getValueAsBit("isDummyClass")) continue; // Ignore dummies |
| |
| std::string Name = RC->getName(); |
| if (Name.size() > 9 && Name[9] == '.') { |
| static unsigned AnonCounter = 0; |
| Name = "AnonRegClass_"+utostr(AnonCounter++); |
| } |
| |
| RegClassNames.push_back(Name); |
| |
| // Emit the register list now... |
| OS << " // " << Name << " Register Class...\n const unsigned " << Name |
| << "[] = {\n "; |
| ListInit *RegList = RC->getValueAsListInit("MemberList"); |
| for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) { |
| DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i)); |
| if (!RegDef) throw "Register class member is not a record!"; |
| Record *Reg = RegDef->getDef(); |
| if (!Reg->isSubClassOf("Register")) |
| throw "Register Class member '" + Reg->getName() + |
| " does not derive from the Register class!"; |
| if (RegistersFound.count(Reg)) |
| throw "Register '" + Reg->getName() + |
| "' included in multiple register classes!"; |
| RegistersFound.insert(Reg); |
| OS << getQualifiedName(Reg) << ", "; |
| } |
| OS << "\n };\n\n"; |
| |
| OS << " struct " << Name << "Class : public TargetRegisterClass {\n" |
| << " " << Name << "Class() : TargetRegisterClass(" |
| << RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment") |
| << ", " << Name << ", " << Name << " + " << RegList->getSize() |
| << ") {}\n"; |
| |
| if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods"))) |
| OS << CI->getValue(); |
| else |
| throw "Expected 'code' fragment for 'Methods' value in register class '"+ |
| RC->getName() + "'!"; |
| |
| OS << " } " << Name << "Instance;\n\n"; |
| } |
| |
| OS << " const TargetRegisterClass* const RegisterClasses[] = {\n"; |
| for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i) |
| OS << " &" << RegClassNames[i] << "Instance,\n"; |
| OS << " };\n"; |
| |
| // Emit register class aliases... |
| std::vector<Record*> RegisterAliasesRecs = |
| Records.getAllDerivedDefinitions("RegisterAliases"); |
| std::map<Record*, std::set<Record*> > RegisterAliases; |
| |
| for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) { |
| Record *AS = RegisterAliasesRecs[i]; |
| Record *R = AS->getValueAsDef("Reg"); |
| ListInit *LI = AS->getValueAsListInit("Aliases"); |
| |
| // Add information that R aliases all of the elements in the list... and |
| // that everything in the list aliases R. |
| for (unsigned j = 0, e = LI->getSize(); j != e; ++j) { |
| DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j)); |
| if (!Reg) throw "ERROR: Alias list element is not a def!"; |
| if (RegisterAliases[R].count(Reg->getDef())) |
| std::cerr << "Warning: register alias between " << getQualifiedName(R) |
| << " and " << getQualifiedName(Reg->getDef()) |
| << " specified multiple times!\n"; |
| RegisterAliases[R].insert(Reg->getDef()); |
| |
| if (RegisterAliases[Reg->getDef()].count(R)) |
| std::cerr << "Warning: register alias between " << getQualifiedName(R) |
| << " and " << getQualifiedName(Reg->getDef()) |
| << " specified multiple times!\n"; |
| RegisterAliases[Reg->getDef()].insert(R); |
| } |
| } |
| |
| if (!RegisterAliases.empty()) |
| OS << "\n\n // Register Alias Sets...\n"; |
| |
| // Emit the empty alias list |
| OS << " const unsigned Empty_AliasSet[] = { 0 };\n"; |
| // Loop over all of the registers which have aliases, emitting the alias list |
| // to memory. |
| for (std::map<Record*, std::set<Record*> >::iterator |
| I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) { |
| OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { "; |
| for (std::set<Record*>::iterator ASI = I->second.begin(), |
| E = I->second.end(); ASI != E; ++ASI) |
| OS << getQualifiedName(*ASI) << ", "; |
| OS << "0 };\n"; |
| } |
| |
| OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n"; |
| OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n"; |
| // Now that register alias sets have been emitted, emit the register |
| // descriptors now. |
| for (unsigned i = 0, e = Registers.size(); i != e; ++i) { |
| Record *Reg = Registers[i]; |
| OS << " { \""; |
| if (!Reg->getValueAsString("Name").empty()) |
| OS << Reg->getValueAsString("Name"); |
| else |
| OS << Reg->getName(); |
| OS << "\",\t"; |
| if (RegisterAliases.count(Reg)) |
| OS << Reg->getName() << "_AliasSet,\t"; |
| else |
| OS << "Empty_AliasSet,\t"; |
| OS << "0, 0 },\n"; |
| } |
| OS << " };\n"; // End of register descriptors... |
| OS << "}\n\n"; // End of anonymous namespace... |
| |
| CodeGenTarget Target; |
| |
| OS << "namespace " << Target.getName() << " { // Register classes\n"; |
| for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) { |
| if (RegisterClasses[i]->getValueAsBit("isDummyClass")) |
| continue; // Ignore dummies |
| |
| const std::string &Name = RegisterClasses[i]->getName(); |
| if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes |
| OS << " TargetRegisterClass *" << Name << "RegisterClass = &" |
| << Name << "Instance;\n"; |
| } |
| OS << "} // end of namespace " << Target.getName() << "\n\n"; |
| |
| |
| |
| std::string ClassName = Target.getName() + "GenRegisterInfo"; |
| |
| // Emit the constructor of the class... |
| OS << ClassName << "::" << ClassName |
| << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n" |
| << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1 |
| << ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n " |
| << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n"; |
| |
| // Emit the getCalleeSaveRegs method... |
| OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n" |
| << " static const unsigned CalleeSaveRegs[] = {\n "; |
| |
| const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters(); |
| for (unsigned i = 0, e = CSR.size(); i != e; ++i) |
| OS << getQualifiedName(CSR[i]) << ", "; |
| OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n"; |
| EmitSourceFileTail(OS); |
| } |
| |
| } // End llvm namespace |