1 //===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
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.
8 //===----------------------------------------------------------------------===//
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.
14 //===----------------------------------------------------------------------===//
16 #include "RegisterInfoEmitter.h"
17 #include "CodeGenTarget.h"
19 #include "Support/StringExtras.h"
23 // runEnums - Print out enum values for all of the registers.
24 void RegisterInfoEmitter::runEnums(std::ostream &OS) {
25 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
27 if (Registers.size() == 0)
28 throw std::string("No 'Register' subclasses defined!");
30 std::string Namespace = Registers[0]->getValueAsString("Namespace");
32 EmitSourceFileHeader("Target Register Enum Values", OS);
34 if (!Namespace.empty())
35 OS << "namespace " << Namespace << " {\n";
36 OS << " enum {\n NoRegister,\n";
38 for (unsigned i = 0, e = Registers.size(); i != e; ++i)
39 OS << " " << Registers[i]->getName() << ", \t// " << i+1 << "\n";
42 if (!Namespace.empty())
44 EmitSourceFileTail(OS);
47 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
48 EmitSourceFileHeader("Register Information Header Fragment", OS);
49 const std::string &TargetName = CodeGenTarget().getName();
50 std::string ClassName = TargetName + "GenRegisterInfo";
52 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
54 OS << "struct " << ClassName << " : public MRegisterInfo {\n"
56 << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
57 << " const unsigned* getCalleeSaveRegs() const;\n"
60 std::vector<Record*> RegisterClasses =
61 Records.getAllDerivedDefinitions("RegisterClass");
63 OS << "namespace " << TargetName << " { // Register classes\n";
64 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
65 const std::string &Name = RegisterClasses[i]->getName();
66 if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
67 OS << " extern TargetRegisterClass *" << Name << "RegisterClass;\n";
69 OS << "} // end of namespace " << TargetName << "\n\n";
70 EmitSourceFileTail(OS);
73 // RegisterInfoEmitter::run - Main register file description emitter.
75 void RegisterInfoEmitter::run(std::ostream &OS) {
78 EmitSourceFileHeader("Register Information Source Fragment", OS);
80 // Start out by emitting each of the register classes... to do this, we build
81 // a set of registers which belong to a register class, this is to ensure that
82 // each register is only in a single register class.
84 std::vector<Record*> RegisterClasses =
85 Records.getAllDerivedDefinitions("RegisterClass");
87 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("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];
98 std::string Name = RC->getName();
99 if (Name.size() > 9 && Name[9] == '.') {
100 static unsigned AnonCounter = 0;
101 Name = "AnonRegClass_"+utostr(AnonCounter++);
104 RegClassNames.push_back(Name);
106 // Emit the register list now...
107 OS << " // " << Name << " Register Class...\n const unsigned " << Name
109 ListInit *RegList = RC->getValueAsListInit("MemberList");
110 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
111 DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
112 if (!RegDef) throw "Register class member is not a record!";
113 Record *Reg = RegDef->getDef();
114 if (!Reg->isSubClassOf("Register"))
115 throw "Register Class member '" + Reg->getName() +
116 " does not derive from the Register class!";
117 if (RegistersFound.count(Reg))
118 throw "Register '" + Reg->getName() +
119 "' included in multiple register classes!";
120 RegistersFound.insert(Reg);
121 OS << getQualifiedName(Reg) << ", ";
125 OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
126 << " " << Name << "Class() : TargetRegisterClass("
127 << RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
128 << ", " << Name << ", " << Name << " + " << RegList->getSize()
131 if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
132 OS << CI->getValue();
134 throw "Expected 'code' fragment for 'Methods' value in register class '"+
135 RC->getName() + "'!";
137 OS << " } " << Name << "Instance;\n\n";
140 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
141 for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
142 OS << " &" << RegClassNames[i] << "Instance,\n";
145 // Emit register class aliases...
146 std::vector<Record*> RegisterAliasesRecs =
147 Records.getAllDerivedDefinitions("RegisterAliases");
148 std::map<Record*, std::set<Record*> > RegisterAliases;
150 for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
151 Record *AS = RegisterAliasesRecs[i];
152 Record *R = AS->getValueAsDef("Reg");
153 ListInit *LI = AS->getValueAsListInit("Aliases");
155 // Add information that R aliases all of the elements in the list... and
156 // that everything in the list aliases R.
157 for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
158 DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j));
159 if (!Reg) throw "ERROR: Alias list element is not a def!";
160 if (RegisterAliases[R].count(Reg->getDef()))
161 std::cerr << "Warning: register alias between " << getQualifiedName(R)
162 << " and " << getQualifiedName(Reg->getDef())
163 << " specified multiple times!\n";
164 RegisterAliases[R].insert(Reg->getDef());
166 if (RegisterAliases[Reg->getDef()].count(R))
167 std::cerr << "Warning: register alias between " << getQualifiedName(R)
168 << " and " << getQualifiedName(Reg->getDef())
169 << " specified multiple times!\n";
170 RegisterAliases[Reg->getDef()].insert(R);
174 if (!RegisterAliases.empty())
175 OS << "\n\n // Register Alias Sets...\n";
177 // Emit the empty alias list
178 OS << " const unsigned Empty_AliasSet[] = { 0 };\n";
179 // Loop over all of the registers which have aliases, emitting the alias list
181 for (std::map<Record*, std::set<Record*> >::iterator
182 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
183 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
184 for (std::set<Record*>::iterator ASI = I->second.begin(),
185 E = I->second.end(); ASI != E; ++ASI)
186 OS << getQualifiedName(*ASI) << ", ";
190 OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
191 OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
192 // Now that register alias sets have been emitted, emit the register
194 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
195 Record *Reg = Registers[i];
197 if (!Reg->getValueAsString("Name").empty())
198 OS << Reg->getValueAsString("Name");
200 OS << Reg->getName();
202 if (RegisterAliases.count(Reg))
203 OS << Reg->getName() << "_AliasSet,\t";
205 OS << "Empty_AliasSet,\t";
208 OS << " };\n"; // End of register descriptors...
209 OS << "}\n\n"; // End of anonymous namespace...
211 OS << "namespace " << Target.getName() << " { // Register classes\n";
212 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
213 const std::string &Name = RegisterClasses[i]->getName();
214 if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
215 OS << " TargetRegisterClass *" << Name << "RegisterClass = &"
216 << Name << "Instance;\n";
218 OS << "} // end of namespace " << Target.getName() << "\n\n";
222 std::string ClassName = Target.getName() + "GenRegisterInfo";
224 // Emit the constructor of the class...
225 OS << ClassName << "::" << ClassName
226 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
227 << " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
228 << ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
229 << " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
231 // Emit the getCalleeSaveRegs method...
232 OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
233 << " static const unsigned CalleeSaveRegs[] = {\n ";
235 const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters();
236 for (unsigned i = 0, e = CSR.size(); i != e; ++i)
237 OS << getQualifiedName(CSR[i]) << ", ";
238 OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";
239 EmitSourceFileTail(OS);