RegisterInfoEmitter.cpp revision 42de581b2f28985ec0c8fcbb26ab4d78c684247f
1//===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This tablegen backend is responsible for emitting a description of a target 11// register file for a code generator. It uses instances of the Register, 12// RegisterAliases, and RegisterClass classes to gather this information. 13// 14//===----------------------------------------------------------------------===// 15 16#include "RegisterInfoEmitter.h" 17#include "CodeGenTarget.h" 18#include "CodeGenRegisters.h" 19#include "Record.h" 20#include "llvm/ADT/StringExtras.h" 21#include "llvm/ADT/STLExtras.h" 22#include <set> 23using namespace llvm; 24 25// runEnums - Print out enum values for all of the registers. 26void RegisterInfoEmitter::runEnums(std::ostream &OS) { 27 CodeGenTarget Target; 28 const std::vector<CodeGenRegister> &Registers = Target.getRegisters(); 29 30 std::string Namespace = Registers[0].TheDef->getValueAsString("Namespace"); 31 32 EmitSourceFileHeader("Target Register Enum Values", OS); 33 OS << "namespace llvm {\n\n"; 34 35 if (!Namespace.empty()) 36 OS << "namespace " << Namespace << " {\n"; 37 OS << " enum {\n NoRegister,\n"; 38 39 for (unsigned i = 0, e = Registers.size(); i != e; ++i) 40 OS << " " << Registers[i].getName() << ", \t// " << i+1 << "\n"; 41 42 OS << " };\n"; 43 if (!Namespace.empty()) 44 OS << "}\n"; 45 OS << "} // End llvm namespace \n"; 46} 47 48void RegisterInfoEmitter::runHeader(std::ostream &OS) { 49 EmitSourceFileHeader("Register Information Header Fragment", OS); 50 CodeGenTarget Target; 51 const std::string &TargetName = Target.getName(); 52 std::string ClassName = TargetName + "GenRegisterInfo"; 53 54 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n"; 55 56 OS << "namespace llvm {\n\n"; 57 58 OS << "struct " << ClassName << " : public MRegisterInfo {\n" 59 << " " << ClassName 60 << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n" 61 << " const unsigned* getCalleeSaveRegs() const;\n" 62 << "};\n\n"; 63 64 const std::vector<CodeGenRegisterClass> &RegisterClasses = 65 Target.getRegisterClasses(); 66 67 if (!RegisterClasses.empty()) { 68 OS << "namespace " << RegisterClasses[0].Namespace 69 << " { // Register classes\n"; 70 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) { 71 const std::string &Name = RegisterClasses[i].getName(); 72 OS << " extern TargetRegisterClass * const "<< Name <<"RegisterClass;\n"; 73 } 74 OS << "} // end of namespace " << TargetName << "\n\n"; 75 } 76 OS << "} // End llvm namespace \n"; 77} 78 79// RegisterInfoEmitter::run - Main register file description emitter. 80// 81void RegisterInfoEmitter::run(std::ostream &OS) { 82 CodeGenTarget Target; 83 EmitSourceFileHeader("Register Information Source Fragment", OS); 84 85 OS << "namespace llvm {\n\n"; 86 87 // Start out by emitting each of the register classes... to do this, we build 88 // a set of registers which belong to a register class, this is to ensure that 89 // each register is only in a single register class. 90 // 91 const std::vector<CodeGenRegisterClass> &RegisterClasses = 92 Target.getRegisterClasses(); 93 94 std::set<Record*> RegistersFound; 95 96 // Loop over all of the register classes... emitting each one. 97 OS << "namespace { // Register classes...\n"; 98 99 // RegClassesBelongedTo - Keep track of which register classes each reg 100 // belongs to. 101 std::multimap<Record*, const CodeGenRegisterClass*> RegClassesBelongedTo; 102 103 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) { 104 const CodeGenRegisterClass &RC = RegisterClasses[rc]; 105 106 // Give the register class a legal C name if it's anonymous. 107 std::string Name = RC.TheDef->getName(); 108 109 // Emit the register list now. 110 OS << " // " << Name << " Register Class...\n const unsigned " << Name 111 << "[] = {\n "; 112 for (unsigned i = 0, e = RC.Elements.size(); i != e; ++i) { 113 Record *Reg = RC.Elements[i]; 114 if (RegistersFound.count(Reg)) 115 throw "Register '" + Reg->getName() + 116 "' included in multiple register classes!"; 117 RegistersFound.insert(Reg); 118 OS << getQualifiedName(Reg) << ", "; 119 120 // Keep track of which regclasses this register is in. 121 RegClassesBelongedTo.insert(std::make_pair(Reg, &RC)); 122 } 123 OS << "\n };\n\n"; 124 125 OS << " struct " << Name << "Class : public TargetRegisterClass {\n" 126 << " " << Name << "Class() : TargetRegisterClass(" 127 << RC.SpillSize/8 << ", " << RC.SpillAlignment/8 << ", " << Name << ", " 128 << Name << " + " << RC.Elements.size() << ") {}\n" 129 << RC.MethodDefinitions << " };\n\n"; 130 } 131 OS << "} // end anonymous namespace\n\n"; 132 133 // Now that all of the structs have been emitted, emit the instances. 134 if (!RegisterClasses.empty()) { 135 OS << "namespace " << RegisterClasses[0].Namespace 136 << " { // Register class instances\n"; 137 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) 138 OS << " " << RegisterClasses[i].getName() << "Class\t" 139 << RegisterClasses[i].getName() << "RegClassInstance;\n"; 140 OS << "}\n"; 141 } 142 143 OS << "\nnamespace {\n"; 144 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n"; 145 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) 146 OS << " &" << getQualifiedName(RegisterClasses[i].TheDef) 147 << "RegClassInstance,\n"; 148 OS << " };\n"; 149 150 // Emit register class aliases... 151 std::map<Record*, std::set<Record*> > RegisterAliases; 152 const std::vector<CodeGenRegister> &Regs = Target.getRegisters(); 153 154 for (unsigned i = 0, e = Regs.size(); i != e; ++i) { 155 Record *R = Regs[i].TheDef; 156 ListInit *LI = Regs[i].TheDef->getValueAsListInit("Aliases"); 157 // Add information that R aliases all of the elements in the list... and 158 // that everything in the list aliases R. 159 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) { 160 DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j)); 161 if (!Reg) throw "ERROR: Alias list element is not a def!"; 162 if (RegisterAliases[R].count(Reg->getDef())) 163 std::cerr << "Warning: register alias between " << getQualifiedName(R) 164 << " and " << getQualifiedName(Reg->getDef()) 165 << " specified multiple times!\n"; 166 RegisterAliases[R].insert(Reg->getDef()); 167 168 if (RegisterAliases[Reg->getDef()].count(R)) 169 std::cerr << "Warning: register alias between " << getQualifiedName(R) 170 << " and " << getQualifiedName(Reg->getDef()) 171 << " specified multiple times!\n"; 172 RegisterAliases[Reg->getDef()].insert(R); 173 } 174 } 175 176 if (!RegisterAliases.empty()) 177 OS << "\n\n // Register Alias Sets...\n"; 178 179 // Emit the empty alias list 180 OS << " const unsigned Empty_AliasSet[] = { 0 };\n"; 181 // Loop over all of the registers which have aliases, emitting the alias list 182 // to memory. 183 for (std::map<Record*, std::set<Record*> >::iterator 184 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) { 185 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { "; 186 for (std::set<Record*>::iterator ASI = I->second.begin(), 187 E = I->second.end(); ASI != E; ++ASI) 188 OS << getQualifiedName(*ASI) << ", "; 189 OS << "0 };\n"; 190 } 191 192 OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n"; 193 OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n"; 194 195 196 // Now that register alias sets have been emitted, emit the register 197 // descriptors now. 198 const std::vector<CodeGenRegister> &Registers = Target.getRegisters(); 199 for (unsigned i = 0, e = Registers.size(); i != e; ++i) { 200 const CodeGenRegister &Reg = Registers[i]; 201 OS << " { \""; 202 if (!Reg.TheDef->getValueAsString("Name").empty()) 203 OS << Reg.TheDef->getValueAsString("Name"); 204 else 205 OS << Reg.getName(); 206 OS << "\",\t"; 207 if (RegisterAliases.count(Reg.TheDef)) 208 OS << Reg.getName() << "_AliasSet,\t"; 209 else 210 OS << "Empty_AliasSet,\t"; 211 212 // Figure out what the size and alignment of the spill slots are for this 213 // reg. This may be explicitly declared in the register, or it may be 214 // inferred from the register classes it is part of. 215 std::multimap<Record*, const CodeGenRegisterClass*>::iterator I, E; 216 tie(I, E) = RegClassesBelongedTo.equal_range(Reg.TheDef); 217 unsigned SpillSize = Reg.DeclaredSpillSize; 218 unsigned SpillAlign = Reg.DeclaredSpillAlignment; 219 for (; I != E; ++I) { // For each reg class this belongs to. 220 const CodeGenRegisterClass *RC = I->second; 221 if (SpillSize == 0) 222 SpillSize = RC->SpillSize; 223 else if (SpillSize != RC->SpillSize) 224 throw "Spill size for regclass '" + RC->getName() + 225 "' doesn't match spill sized already inferred for register '" + 226 Reg.getName() + "'!"; 227 if (SpillAlign == 0) 228 SpillAlign = RC->SpillAlignment; 229 else if (SpillAlign != RC->SpillAlignment) 230 throw "Spill alignment for regclass '" + RC->getName() + 231 "' doesn't match spill sized already inferred for register '" + 232 Reg.getName() + "'!"; 233 } 234 235 OS << SpillSize << ", " << SpillAlign << " },\n"; 236 } 237 OS << " };\n"; // End of register descriptors... 238 OS << "}\n\n"; // End of anonymous namespace... 239 240 if (!RegisterClasses.empty()) { 241 OS << "namespace " << RegisterClasses[0].Namespace 242 << " { // Register classes\n"; 243 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) { 244 OS << " TargetRegisterClass * const " << RegisterClasses[i].getName() 245 << "RegisterClass = &" << getQualifiedName(RegisterClasses[i].TheDef) 246 << "RegClassInstance;\n"; 247 } 248 OS << "} // end of namespace " << RegisterClasses[0].Namespace << "\n\n"; 249 } 250 251 252 std::string ClassName = Target.getName() + "GenRegisterInfo"; 253 254 // Emit the constructor of the class... 255 OS << ClassName << "::" << ClassName 256 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n" 257 << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1 258 << ", RegisterClasses, RegisterClasses+" << RegisterClasses.size() <<",\n " 259 << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n"; 260 261 // Emit the getCalleeSaveRegs method... 262 OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n" 263 << " static const unsigned CalleeSaveRegs[] = {\n "; 264 265 const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters(); 266 for (unsigned i = 0, e = CSR.size(); i != e; ++i) 267 OS << getQualifiedName(CSR[i]) << ", "; 268 OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n"; 269 OS << "} // End llvm namespace \n"; 270} 271