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");
77 std::set<Record*> RegistersFound;
78 std::vector<std::string> RegClassNames;
80 // Loop over all of the register classes... emitting each one.
81 OS << "namespace { // Register classes...\n";
83 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
84 Record *RC = RegisterClasses[rc];
85 std::string Name = RC->getName();
86 if (Name.size() > 9 && Name[9] == '.') {
87 static unsigned AnonCounter = 0;
88 Name = "AnonRegClass_"+utostr(AnonCounter++);
91 RegClassNames.push_back(Name);
93 // Emit the register list now...
94 OS << " // " << Name << " Register Class...\n const unsigned " << Name
96 ListInit *RegList = RC->getValueAsListInit("MemberList");
97 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
98 DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
99 if (!RegDef) throw "Register class member is not a record!";
100 Record *Reg = RegDef->getDef();
101 if (!Reg->isSubClassOf("Register"))
102 throw "Register Class member '" + Reg->getName() +
103 " does not derive from the Register class!";
104 if (RegistersFound.count(Reg))
105 throw "Register '" + Reg->getName() +
106 "' included in multiple register classes!";
107 RegistersFound.insert(Reg);
108 OS << getQualifiedName(Reg) << ", ";
112 OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
113 << " " << Name << "Class() : TargetRegisterClass("
114 << RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
115 << ", " << Name << ", " << Name << " + " << RegList->getSize()
118 if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
119 OS << CI->getValue();
121 throw "Expected 'code' fragment for 'Methods' value in register class '"+
122 RC->getName() + "'!";
124 OS << " } " << Name << "Instance;\n\n";
127 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
128 for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
129 OS << " &" << RegClassNames[i] << "Instance,\n";
132 // Emit register class aliases...
133 std::vector<Record*> RegisterAliasesRecs =
134 Records.getAllDerivedDefinitions("RegisterAliases");
135 std::map<Record*, std::set<Record*> > RegisterAliases;
137 for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
138 Record *AS = RegisterAliasesRecs[i];
139 Record *R = AS->getValueAsDef("Reg");
140 ListInit *LI = AS->getValueAsListInit("Aliases");
142 // Add information that R aliases all of the elements in the list... and
143 // that everything in the list aliases R.
144 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
145 DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j));
146 if (!Reg) throw "ERROR: Alias list element is not a def!";
147 if (RegisterAliases[R].count(Reg->getDef()))
148 std::cerr << "Warning: register alias between " << getQualifiedName(R)
149 << " and " << getQualifiedName(Reg->getDef())
150 << " specified multiple times!\n";
151 RegisterAliases[R].insert(Reg->getDef());
153 if (RegisterAliases[Reg->getDef()].count(R))
154 std::cerr << "Warning: register alias between " << getQualifiedName(R)
155 << " and " << getQualifiedName(Reg->getDef())
156 << " specified multiple times!\n";
157 RegisterAliases[Reg->getDef()].insert(R);
161 if (!RegisterAliases.empty())
162 OS << "\n\n // Register Alias Sets...\n";
164 // Loop over all of the registers which have aliases, emitting the alias list
166 for (std::map<Record*, std::set<Record*> >::iterator
167 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
168 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
169 for (std::set<Record*>::iterator ASI = I->second.begin(),
170 E = I->second.end(); ASI != E; ++ASI)
171 OS << getQualifiedName(*ASI) << ", ";
175 OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
176 OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
177 // Now that register alias sets have been emitted, emit the register
179 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
180 Record *Reg = Registers[i];
182 if (!Reg->getValueAsString("Name").empty())
183 OS << Reg->getValueAsString("Name");
185 OS << Reg->getName();
187 if (RegisterAliases.count(Reg))
188 OS << Reg->getName() << "_AliasSet,\t";
193 OS << " };\n"; // End of register descriptors...
194 OS << "}\n\n"; // End of anonymous namespace...
196 CodeGenTarget Target;
198 OS << "namespace " << Target.getName() << " { // Register classes\n";
199 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
200 const std::string &Name = RegisterClasses[i]->getName();
201 if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
202 OS << " TargetRegisterClass *" << Name << "RegisterClass = &"
203 << Name << "Instance;\n";
205 OS << "} // end of namespace " << Target.getName() << "\n\n";
209 std::string ClassName = Target.getName() + "GenRegisterInfo";
211 // Emit the constructor of the class...
212 OS << ClassName << "::" << ClassName
213 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
214 << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
215 << ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
216 << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
218 // Emit the getCalleeSaveRegs method...
219 OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
220 << " static const unsigned CalleeSaveRegs[] = {\n ";
222 const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters();
223 for (unsigned i = 0, e = CSR.size(); i != e; ++i)
224 OS << getQualifiedName(CSR[i]) << ", ";
225 OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";