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"
12 static void EmitSourceHeader(const std::string &Desc, std::ostream &o) {
13 o << "//===- TableGen'erated file -------------------------------------*-"
14 " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
15 "d file, do not edit!\n//\n//===------------------------------------"
16 "----------------------------------===//\n\n";
19 void RegisterInfoEmitter::runHeader(std::ostream &OS) {
20 std::vector<Record*> RegisterInfos =
21 Records.getAllDerivedDefinitions("RegisterInfo");
23 if (RegisterInfos.size() != 1)
24 throw std::string("ERROR: Multiple subclasses of RegisterInfo defined!");
26 EmitSourceHeader("Register Information Header Fragment", OS);
28 std::string ClassName = RegisterInfos[0]->getValueAsString("ClassName");
30 OS << "#include \"llvm/CodeGen/MRegisterInfo.h\"\n\n";
32 OS << "struct " << ClassName << ": public MRegisterInfo {\n"
33 << " " << ClassName << "();\n"
34 << " const unsigned* getCalleeSaveRegs() const;\n"
38 void RegisterInfoEmitter::run(std::ostream &o) {