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 // runEnums - Print out enum values for all of the registers.
15 void RegisterInfoEmitter::runEnums(std::ostream &OS) {
16 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
18 if (Registers.size() == 0)
19 throw std::string("No 'Register' subclasses defined!");
21 std::string Namespace = Registers[0]->getValueAsString("Namespace");
23 EmitSourceFileHeader("Target Register Enum Values", OS);
25 if (!Namespace.empty())
26 OS << "namespace " << Namespace << " {\n";
27 OS << " enum {\n NoRegister,\n";
29 for (unsigned i = 0, e = Registers.size(); i != e; ++i)
30 OS << " " << Registers[i]->getName() << ", \t// " << i+1 << "\n";
33 if (!Namespace.empty())
37 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
38 EmitSourceFileHeader("Register Information Header Fragment", OS);
40 std::string ClassName = getTarget(Records)->getName() + "GenRegisterInfo";
42 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
44 OS << "struct " << ClassName << " : public MRegisterInfo {\n"
46 << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
47 << " const unsigned* getCalleeSaveRegs() const;\n"
51 // RegisterInfoEmitter::run - Main register file description emitter.
53 void RegisterInfoEmitter::run(std::ostream &OS) {
54 EmitSourceFileHeader("Register Information Source Fragment", OS);
56 // Start out by emitting each of the register classes... to do this, we build
57 // a set of registers which belong to a register class, this is to ensure that
58 // each register is only in a single register class.
60 std::vector<Record*> RegisterClasses =
61 Records.getAllDerivedDefinitions("RegisterClass");
63 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
64 Record *RegisterClass = Records.getClass("Register");
66 std::set<Record*> RegistersFound;
67 std::vector<std::string> RegClassNames;
69 // Loop over all of the register classes... emitting each one.
70 OS << "namespace { // Register classes...\n";
72 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
73 Record *RC = RegisterClasses[rc];
74 std::string Name = RC->getName();
75 if (Name.size() > 9 && Name[9] == '.') {
76 static unsigned AnonCounter = 0;
77 Name = "AnonRegClass_"+utostr(AnonCounter++);
80 RegClassNames.push_back(Name);
82 // Emit the register list now...
83 OS << " // " << Name << " Register Class...\n const unsigned " << Name
85 ListInit *RegList = RC->getValueAsListInit("MemberList");
86 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
87 DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
88 if (!RegDef) throw "Register class member is not a record!";
89 Record *Reg = RegDef->getDef();
90 if (!Reg->isSubClassOf(RegisterClass))
91 throw "Register Class member '" + Reg->getName() +
92 " does not derive from the Register class!";
93 if (RegistersFound.count(Reg))
94 throw "Register '" + Reg->getName() +
95 "' included in multiple register classes!";
96 RegistersFound.insert(Reg);
97 OS << getQualifiedName(Reg) << ", ";
101 OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
102 << " " << Name << "Class() : TargetRegisterClass("
103 << RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
104 << ", " << Name << ", " << Name << " + " << RegList->getSize()
107 if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
108 OS << CI->getValue();
110 throw "Expected 'code' fragment for 'Methods' value in register class '"+
111 RC->getName() + "'!";
113 OS << " } " << Name << "Instance;\n\n";
116 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
117 for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
118 OS << " &" << RegClassNames[i] << "Instance,\n";
121 // Emit register class aliases...
122 std::vector<Record*> RegisterAliasesRecs =
123 Records.getAllDerivedDefinitions("RegisterAliases");
124 std::map<Record*, std::set<Record*> > RegisterAliases;
126 for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
127 Record *AS = RegisterAliasesRecs[i];
128 Record *R = AS->getValueAsDef("Reg");
129 ListInit *LI = AS->getValueAsListInit("Aliases");
131 // Add information that R aliases all of the elements in the list... and
132 // that everything in the list aliases R.
133 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
134 DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j));
135 if (!Reg) throw "ERROR: Alias list element is not a def!";
136 if (RegisterAliases[R].count(Reg->getDef()))
137 std::cerr << "Warning: register alias between " << getQualifiedName(R)
138 << " and " << getQualifiedName(Reg->getDef())
139 << " specified multiple times!\n";
140 RegisterAliases[R].insert(Reg->getDef());
142 if (RegisterAliases[Reg->getDef()].count(R))
143 std::cerr << "Warning: register alias between " << getQualifiedName(R)
144 << " and " << getQualifiedName(Reg->getDef())
145 << " specified multiple times!\n";
146 RegisterAliases[Reg->getDef()].insert(R);
150 if (!RegisterAliases.empty())
151 OS << "\n\n // Register Alias Sets...\n";
153 // Loop over all of the registers which have aliases, emitting the alias list
155 for (std::map<Record*, std::set<Record*> >::iterator
156 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
157 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
158 for (std::set<Record*>::iterator ASI = I->second.begin(),
159 E = I->second.end(); ASI != E; ++ASI)
160 OS << getQualifiedName(*ASI) << ", ";
164 OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
165 OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
166 // Now that register alias sets have been emitted, emit the register
168 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
169 Record *Reg = Registers[i];
171 if (!Reg->getValueAsString("Name").empty())
172 OS << Reg->getValueAsString("Name");
174 OS << Reg->getName();
176 if (RegisterAliases.count(Reg))
177 OS << Reg->getName() << "_AliasSet,\t";
182 OS << " };\n"; // End of register descriptors...
183 OS << "}\n\n"; // End of anonymous namespace...
185 Record *Target = getTarget(Records);
186 std::string ClassName = Target->getName() + "GenRegisterInfo";
188 // Emit the constructor of the class...
189 OS << ClassName << "::" << ClassName
190 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
191 << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
192 << ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
193 << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
195 // Emit the getCalleeSaveRegs method...
196 OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
197 << " static const unsigned CalleeSaveRegs[] = {\n ";
199 ListInit *LI = Target->getValueAsListInit("CalleeSavedRegisters");
200 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
201 if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(i)))
202 OS << getQualifiedName(DI->getDef()) << ", ";
204 throw "Expected register definition in CalleeSavedRegisters list!";
205 OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";