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() << ",\n";
40 if (!Namespace.empty())
44 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
45 std::vector<Record*> RegisterInfos =
46 Records.getAllDerivedDefinitions("RegisterInfo");
48 if (RegisterInfos.size() != 1)
49 throw std::string("ERROR: Multiple subclasses of RegisterInfo defined!");
51 EmitSourceHeader("Register Information Header Fragment", OS);
53 std::string ClassName = RegisterInfos[0]->getValueAsString("ClassName");
55 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
57 OS << "struct " << ClassName << " : public MRegisterInfo {\n"
58 << " " << ClassName << "();\n"
59 << " const unsigned* getCalleeSaveRegs() const;\n"
63 static std::string getQualifiedRecordName(Record *R) {
64 std::string Namespace = R->getValueAsString("Namespace");
65 if (Namespace.empty()) return R->getName();
66 return Namespace + "::" + R->getName();
69 // RegisterInfoEmitter::run - Main register file description emitter.
71 void RegisterInfoEmitter::run(std::ostream &OS) {
72 EmitSourceHeader("Register Information Source Fragment", OS);
74 // Start out by emitting each of the register classes... to do this, we build
75 // a set of registers which belong to a register class, this is to ensure that
76 // each register is only in a single register class.
78 std::vector<Record*> RegisterClasses =
79 Records.getAllDerivedDefinitions("RegisterClass");
81 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
82 Record *RegisterClass = Records.getClass("Register");
84 std::set<Record*> RegistersFound;
86 // Loop over all of the register classes... emitting each one.
87 OS << "namespace { // Register classes...\n";
88 std::vector<std::string> RegisterClassNames;
89 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
90 Record *RC = RegisterClasses[rc];
91 std::string Name = RC->getName();
93 static unsigned AnonCounter = 0;
94 Name = "AnonRegClass_"+utostr(AnonCounter++);
97 // Emit the register list now...
98 OS << " // " << Name << " Register Class...\n const unsigned " << Name
100 ListInit *RegList = RC->getValueAsListInit("MemberList");
101 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
102 Record *Reg = RegList->getElement(i);
103 if (!Reg->isSubClassOf(RegisterClass))
104 throw "Register Class member '" + Reg->getName() +
105 " does not derive from the Register class!";
106 if (RegistersFound.count(Reg))
107 throw "Register '" + Reg->getName() +
108 "' included in multiple register classes!";
109 OS << getQualifiedRecordName(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";
129 OS << "}\n"; // End of anonymous namespace...