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"
13 static void EmitSourceHeader(const std::string &Desc, std::ostream &o) {
14 o << "//===- TableGen'erated file -------------------------------------*-"
15 " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
16 "d file, do not edit!\n//\n//===------------------------------------"
17 "----------------------------------===//\n\n";
20 // runEnums - Print out enum values for all of the registers.
21 void RegisterInfoEmitter::runEnums(std::ostream &OS) {
22 std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
24 if (Registers.size() == 0)
25 throw std::string("No 'Register' subclasses defined!");
27 std::string Namespace = Registers[0]->getValueAsString("Namespace");
29 EmitSourceHeader("Target Register Enum Values", OS);
31 if (!Namespace.empty())
32 OS << "namespace " << Namespace << " {\n";
33 OS << " enum {\n NoRegister,\n";
35 for (unsigned i = 0, e = Registers.size(); i != e; ++i)
36 OS << " " << Registers[i]->getName() << ",\n";
39 if (!Namespace.empty())
43 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
44 std::vector<Record*> RegisterInfos =
45 Records.getAllDerivedDefinitions("RegisterInfo");
47 if (RegisterInfos.size() != 1)
48 throw std::string("ERROR: Multiple subclasses of RegisterInfo defined!");
50 EmitSourceHeader("Register Information Header Fragment", OS);
52 std::string ClassName = RegisterInfos[0]->getValueAsString("ClassName");
54 OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
56 OS << "struct " << ClassName << " : public MRegisterInfo {\n"
57 << " " << ClassName << "();\n"
58 << " const unsigned* getCalleeSaveRegs() const;\n"
62 // RegisterInfoEmitter::run - Main register file description emitter.
64 void RegisterInfoEmitter::run(std::ostream &OS) {
65 EmitSourceHeader("Register Information Source Fragment", OS);
67 // Start out by emitting each of the register classes... to do this, we build
68 // a set of registers which belong to a register class, this is to ensure that
69 // each register is only in a single register class.
71 std::vector<Record*> RegisterClasses =
72 Records.getAllDerivedDefinitions("RegisterClass");
74 std::set<Record*> RegistersFound;
76 // Loop over all of the register classes... emitting each one.
77 OS << "namespace { // Register classes...\n";
78 std::vector<std::string> RegisterClassNames;
79 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
80 Record *RC = RegisterClasses[rc];
81 std::string Name = RC->getName();
86 OS << "}\n"; // End of anonymous namespace...