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"
10 #include "CodeGenWrappers.h"
12 #include "Support/StringExtras.h"
15 // runEnums - Print out enum values for all of the registers.
16 void RegisterInfoEmitter::runEnums(std::ostream &OS) {
17 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
19 if (Registers.size() == 0)
20 throw std::string("No 'Register' subclasses defined!");
22 std::string Namespace = Registers[0]->getValueAsString("Namespace");
24 EmitSourceFileHeader("Target Register Enum Values", OS);
26 if (!Namespace.empty())
27 OS << "namespace " << Namespace << " {\n";
28 OS << " enum {\n NoRegister,\n";
30 for (unsigned i = 0, e = Registers.size(); i != e; ++i)
31 OS << " " << Registers[i]->getName() << ", \t// " << i+1 << "\n";
34 if (!Namespace.empty())
38 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
39 EmitSourceFileHeader("Register Information Header Fragment", OS);
40 const std::string &TargetName = CodeGenTarget().getName();
41 std::string ClassName = TargetName + "GenRegisterInfo";
43 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
45 OS << "struct " << ClassName << " : public MRegisterInfo {\n"
47 << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
48 << " const unsigned* getCalleeSaveRegs() const;\n"
51 std::vector<Record*> RegisterClasses =
52 Records.getAllDerivedDefinitions("RegisterClass");
54 OS << "namespace " << TargetName << " { // Register classes\n";
55 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
56 const std::string &Name = RegisterClasses[i]->getName();
57 if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
58 OS << " extern TargetRegisterClass *" << Name << "RegisterClass;\n";
60 OS << "} // end of namespace " << TargetName << "\n\n";
63 // RegisterInfoEmitter::run - Main register file description emitter.
65 void RegisterInfoEmitter::run(std::ostream &OS) {
66 EmitSourceFileHeader("Register Information Source Fragment", OS);
68 // Start out by emitting each of the register classes... to do this, we build
69 // a set of registers which belong to a register class, this is to ensure that
70 // each register is only in a single register class.
72 std::vector<Record*> RegisterClasses =
73 Records.getAllDerivedDefinitions("RegisterClass");
75 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
76 Record *RegisterClass = Records.getClass("Register");
78 std::set<Record*> RegistersFound;
79 std::vector<std::string> RegClassNames;
81 // Loop over all of the register classes... emitting each one.
82 OS << "namespace { // Register classes...\n";
84 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
85 Record *RC = RegisterClasses[rc];
86 std::string Name = RC->getName();
87 if (Name.size() > 9 && Name[9] == '.') {
88 static unsigned AnonCounter = 0;
89 Name = "AnonRegClass_"+utostr(AnonCounter++);
92 RegClassNames.push_back(Name);
94 // Emit the register list now...
95 OS << " // " << Name << " Register Class...\n const unsigned " << Name
97 ListInit *RegList = RC->getValueAsListInit("MemberList");
98 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
99 DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
100 if (!RegDef) throw "Register class member is not a record!";
101 Record *Reg = RegDef->getDef();
102 if (!Reg->isSubClassOf(RegisterClass))
103 throw "Register Class member '" + Reg->getName() +
104 " does not derive from the Register class!";
105 if (RegistersFound.count(Reg))
106 throw "Register '" + Reg->getName() +
107 "' included in multiple register classes!";
108 RegistersFound.insert(Reg);
109 OS << getQualifiedName(Reg) << ", ";
113 OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
114 << " " << Name << "Class() : TargetRegisterClass("
115 << RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
116 << ", " << Name << ", " << Name << " + " << RegList->getSize()
119 if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
120 OS << CI->getValue();
122 throw "Expected 'code' fragment for 'Methods' value in register class '"+
123 RC->getName() + "'!";
125 OS << " } " << Name << "Instance;\n\n";
128 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
129 for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
130 OS << " &" << RegClassNames[i] << "Instance,\n";
133 // Emit register class aliases...
134 std::vector<Record*> RegisterAliasesRecs =
135 Records.getAllDerivedDefinitions("RegisterAliases");
136 std::map<Record*, std::set<Record*> > RegisterAliases;
138 for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
139 Record *AS = RegisterAliasesRecs[i];
140 Record *R = AS->getValueAsDef("Reg");
141 ListInit *LI = AS->getValueAsListInit("Aliases");
143 // Add information that R aliases all of the elements in the list... and
144 // that everything in the list aliases R.
145 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
146 DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j));
147 if (!Reg) throw "ERROR: Alias list element is not a def!";
148 if (RegisterAliases[R].count(Reg->getDef()))
149 std::cerr << "Warning: register alias between " << getQualifiedName(R)
150 << " and " << getQualifiedName(Reg->getDef())
151 << " specified multiple times!\n";
152 RegisterAliases[R].insert(Reg->getDef());
154 if (RegisterAliases[Reg->getDef()].count(R))
155 std::cerr << "Warning: register alias between " << getQualifiedName(R)
156 << " and " << getQualifiedName(Reg->getDef())
157 << " specified multiple times!\n";
158 RegisterAliases[Reg->getDef()].insert(R);
162 if (!RegisterAliases.empty())
163 OS << "\n\n // Register Alias Sets...\n";
165 // Loop over all of the registers which have aliases, emitting the alias list
167 for (std::map<Record*, std::set<Record*> >::iterator
168 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
169 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
170 for (std::set<Record*>::iterator ASI = I->second.begin(),
171 E = I->second.end(); ASI != E; ++ASI)
172 OS << getQualifiedName(*ASI) << ", ";
176 OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
177 OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
178 // Now that register alias sets have been emitted, emit the register
180 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
181 Record *Reg = Registers[i];
183 if (!Reg->getValueAsString("Name").empty())
184 OS << Reg->getValueAsString("Name");
186 OS << Reg->getName();
188 if (RegisterAliases.count(Reg))
189 OS << Reg->getName() << "_AliasSet,\t";
194 OS << " };\n"; // End of register descriptors...
195 OS << "}\n\n"; // End of anonymous namespace...
197 CodeGenTarget Target;
199 OS << "namespace " << Target.getName() << " { // Register classes\n";
200 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
201 const std::string &Name = RegisterClasses[i]->getName();
202 if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
203 OS << " TargetRegisterClass *" << Name << "RegisterClass = &"
204 << Name << "Instance;\n";
206 OS << "} // end of namespace " << Target.getName() << "\n\n";
210 std::string ClassName = Target.getName() + "GenRegisterInfo";
212 // Emit the constructor of the class...
213 OS << ClassName << "::" << ClassName
214 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
215 << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
216 << ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
217 << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
219 // Emit the getCalleeSaveRegs method...
220 OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
221 << " static const unsigned CalleeSaveRegs[] = {\n ";
223 const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters();
224 for (unsigned i = 0, e = CSR.size(); i != e; ++i)
225 OS << getQualifiedName(CSR[i]) << ", ";
226 OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";