1 //===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
3 // This tablegen backend is responsible for emitting a description of a target
4 // register file for a code generator. It uses instances of the Register,
5 // RegisterAliases, and RegisterClass classes to gather this information.
7 //===----------------------------------------------------------------------===//
9 #include "RegisterInfoEmitter.h"
11 #include "Support/StringExtras.h"
14 static void EmitSourceHeader(const std::string &Desc, std::ostream &o) {
15 o << "//===- TableGen'erated file -------------------------------------*-"
16 " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
17 "d file, do not edit!\n//\n//===------------------------------------"
18 "----------------------------------===//\n\n";
21 // runEnums - Print out enum values for all of the registers.
22 void RegisterInfoEmitter::runEnums(std::ostream &OS) {
23 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
25 if (Registers.size() == 0)
26 throw std::string("No 'Register' subclasses defined!");
28 std::string Namespace = Registers[0]->getValueAsString("Namespace");
30 EmitSourceHeader("Target Register Enum Values", OS);
32 if (!Namespace.empty())
33 OS << "namespace " << Namespace << " {\n";
34 OS << " enum {\n NoRegister,\n";
36 for (unsigned i = 0, e = Registers.size(); i != e; ++i)
37 OS << " " << Registers[i]->getName() << ",\t// " << i+1 << "\n";
40 if (!Namespace.empty())
44 static Record *getRegisterInfo(RecordKeeper &RC) {
45 std::vector<Record*> RegisterInfos =
46 Records.getAllDerivedDefinitions("RegisterInfo");
48 if (RegisterInfos.size() != 1)
49 throw std::string("ERROR: Multiple subclasses of RegisterInfo defined!");
50 return RegisterInfos[0];
53 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
54 EmitSourceHeader("Register Information Header Fragment", OS);
56 std::string ClassName =
57 getRegisterInfo(Records)->getValueAsString("ClassName");
59 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
61 OS << "struct " << ClassName << " : public MRegisterInfo {\n"
63 << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
64 << " const unsigned* getCalleeSaveRegs() const;\n"
68 static std::string getQualifiedName(Record *R) {
69 std::string Namespace = R->getValueAsString("Namespace");
70 if (Namespace.empty()) return R->getName();
71 return Namespace + "::" + R->getName();
74 // RegisterInfoEmitter::run - Main register file description emitter.
76 void RegisterInfoEmitter::run(std::ostream &OS) {
77 EmitSourceHeader("Register Information Source Fragment", OS);
79 // Start out by emitting each of the register classes... to do this, we build
80 // a set of registers which belong to a register class, this is to ensure that
81 // each register is only in a single register class.
83 std::vector<Record*> RegisterClasses =
84 Records.getAllDerivedDefinitions("RegisterClass");
86 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
87 Record *RegisterClass = Records.getClass("Register");
89 std::set<Record*> RegistersFound;
90 std::vector<std::string> RegClassNames;
92 // Loop over all of the register classes... emitting each one.
93 OS << "namespace { // Register classes...\n";
95 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
96 Record *RC = RegisterClasses[rc];
97 std::string Name = RC->getName();
99 static unsigned AnonCounter = 0;
100 Name = "AnonRegClass_"+utostr(AnonCounter++);
103 RegClassNames.push_back(Name);
105 // Emit the register list now...
106 OS << " // " << Name << " Register Class...\n const unsigned " << Name
108 ListInit *RegList = RC->getValueAsListInit("MemberList");
109 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
110 Record *Reg = RegList->getElement(i);
111 if (!Reg->isSubClassOf(RegisterClass))
112 throw "Register Class member '" + Reg->getName() +
113 " does not derive from the Register class!";
114 if (RegistersFound.count(Reg))
115 throw "Register '" + Reg->getName() +
116 "' included in multiple register classes!";
117 RegistersFound.insert(Reg);
118 OS << getQualifiedName(Reg) << ", ";
122 OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
123 << " " << Name << "Class() : TargetRegisterClass("
124 << RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
125 << ", " << Name << ", " << Name << " + " << RegList->getSize()
128 if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
129 OS << CI->getValue();
131 throw "Expected 'code' fragment for 'Methods' value in register class '"+
132 RC->getName() + "'!";
134 OS << " } " << Name << "Instance;\n\n";
137 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
138 for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
139 OS << " &" << RegClassNames[i] << "Instance,\n";
142 // Emit register class aliases...
143 std::vector<Record*> RegisterAliasesRecs =
144 Records.getAllDerivedDefinitions("RegisterAliases");
145 std::map<Record*, std::set<Record*> > RegisterAliases;
147 for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
148 Record *AS = RegisterAliasesRecs[i];
149 Record *R = AS->getValueAsDef("Reg");
150 ListInit *LI = AS->getValueAsListInit("Aliases");
152 // Add information that R aliases all of the elements in the list... and
153 // that everything in the list aliases R.
154 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
155 if (RegisterAliases[R].count(LI->getElement(j)))
156 std::cerr << "Warning: register alias between " << getQualifiedName(R)
157 << " and " << getQualifiedName(LI->getElement(j))
158 << " specified multiple times!\n";
159 RegisterAliases[R].insert(LI->getElement(j));
161 if (RegisterAliases[LI->getElement(j)].count(R))
162 std::cerr << "Warning: register alias between " << getQualifiedName(R)
163 << " and " << getQualifiedName(LI->getElement(j))
164 << " specified multiple times!\n";
165 RegisterAliases[LI->getElement(j)].insert(R);
169 if (!RegisterAliases.empty())
170 OS << "\n\n // Register Alias Sets...\n";
172 // Loop over all of the registers which have aliases, emitting the alias list
174 for (std::map<Record*, std::set<Record*> >::iterator
175 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
176 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
177 for (std::set<Record*>::iterator ASI = I->second.begin(),
178 E = I->second.end(); ASI != E; ++ASI)
179 OS << getQualifiedName(*ASI) << ", ";
183 OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
184 OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
185 // Now that register alias sets have been emitted, emit the register
187 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
188 Record *Reg = Registers[i];
189 OS << " { \"" << Reg->getName() << "\",\t";
190 if (RegisterAliases.count(Reg))
191 OS << Reg->getName() << "_AliasSet,\t";
196 OS << " };\n"; // End of register descriptors...
197 OS << "}\n\n"; // End of anonymous namespace...
199 Record *RegisterInfo = getRegisterInfo(Records);
200 std::string ClassName = RegisterInfo->getValueAsString("ClassName");
202 // Emit the constructor of the class...
203 OS << ClassName << "::" << ClassName
204 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
205 << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
206 << ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
207 << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
209 // Emit the getCalleeSaveRegs method...
210 OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
211 << " static const unsigned CalleeSaveRegs[] = {\n ";
213 ListInit *LI = RegisterInfo->getValueAsListInit("CalleeSavedRegisters");
214 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
215 OS << getQualifiedName(LI->getElement(i)) << ", ";
216 OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";