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//===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
//
// This tablegen backend is responsible for emitting a description of a target
// register file for a code generator. It uses instances of the Register,
// RegisterAliases, and RegisterClass classes to gather this information.
//
//===----------------------------------------------------------------------===//
#include "RegisterInfoEmitter.h"
#include "CodeGenWrappers.h"
#include "Record.h"
#include "Support/StringExtras.h"
#include <set>
// runEnums - Print out enum values for all of the registers.
void RegisterInfoEmitter::runEnums(std::ostream &OS) {
std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
if (Registers.size() == 0)
throw std::string("No 'Register' subclasses defined!");
std::string Namespace = Registers[0]->getValueAsString("Namespace");
EmitSourceFileHeader("Target Register Enum Values", OS);
if (!Namespace.empty())
OS << "namespace " << Namespace << " {\n";
OS << " enum {\n NoRegister,\n";
for (unsigned i = 0, e = Registers.size(); i != e; ++i)
OS << " " << Registers[i]->getName() << ", \t// " << i+1 << "\n";
OS << " };\n";
if (!Namespace.empty())
OS << "}\n";
}
void RegisterInfoEmitter::runHeader(std::ostream &OS) {
EmitSourceFileHeader("Register Information Header Fragment", OS);
const std::string &TargetName = CodeGenTarget().getName();
std::string ClassName = TargetName + "GenRegisterInfo";
OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
OS << "struct " << ClassName << " : public MRegisterInfo {\n"
<< " " << ClassName
<< "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
<< " const unsigned* getCalleeSaveRegs() const;\n"
<< "};\n\n";
std::vector<Record*> RegisterClasses =
Records.getAllDerivedDefinitions("RegisterClass");
OS << "namespace " << TargetName << " { // Register classes\n";
for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
const std::string &Name = RegisterClasses[i]->getName();
if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
OS << " extern TargetRegisterClass *" << Name << "RegisterClass;\n";
}
OS << "} // end of namespace " << TargetName << "\n\n";
}
// RegisterInfoEmitter::run - Main register file description emitter.
//
void RegisterInfoEmitter::run(std::ostream &OS) {
EmitSourceFileHeader("Register Information Source Fragment", OS);
// Start out by emitting each of the register classes... to do this, we build
// a set of registers which belong to a register class, this is to ensure that
// each register is only in a single register class.
//
std::vector<Record*> RegisterClasses =
Records.getAllDerivedDefinitions("RegisterClass");
std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
std::set<Record*> RegistersFound;
std::vector<std::string> RegClassNames;
// Loop over all of the register classes... emitting each one.
OS << "namespace { // Register classes...\n";
for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
Record *RC = RegisterClasses[rc];
std::string Name = RC->getName();
if (Name.size() > 9 && Name[9] == '.') {
static unsigned AnonCounter = 0;
Name = "AnonRegClass_"+utostr(AnonCounter++);
}
RegClassNames.push_back(Name);
// Emit the register list now...
OS << " // " << Name << " Register Class...\n const unsigned " << Name
<< "[] = {\n ";
ListInit *RegList = RC->getValueAsListInit("MemberList");
for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
if (!RegDef) throw "Register class member is not a record!";
Record *Reg = RegDef->getDef();
if (!Reg->isSubClassOf("Register"))
throw "Register Class member '" + Reg->getName() +
" does not derive from the Register class!";
if (RegistersFound.count(Reg))
throw "Register '" + Reg->getName() +
"' included in multiple register classes!";
RegistersFound.insert(Reg);
OS << getQualifiedName(Reg) << ", ";
}
OS << "\n };\n\n";
OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
<< " " << Name << "Class() : TargetRegisterClass("
<< RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
<< ", " << Name << ", " << Name << " + " << RegList->getSize()
<< ") {}\n";
if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
OS << CI->getValue();
else
throw "Expected 'code' fragment for 'Methods' value in register class '"+
RC->getName() + "'!";
OS << " } " << Name << "Instance;\n\n";
}
OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
OS << " &" << RegClassNames[i] << "Instance,\n";
OS << " };\n";
// Emit register class aliases...
std::vector<Record*> RegisterAliasesRecs =
Records.getAllDerivedDefinitions("RegisterAliases");
std::map<Record*, std::set<Record*> > RegisterAliases;
for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
Record *AS = RegisterAliasesRecs[i];
Record *R = AS->getValueAsDef("Reg");
ListInit *LI = AS->getValueAsListInit("Aliases");
// Add information that R aliases all of the elements in the list... and
// that everything in the list aliases R.
for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j));
if (!Reg) throw "ERROR: Alias list element is not a def!";
if (RegisterAliases[R].count(Reg->getDef()))
std::cerr << "Warning: register alias between " << getQualifiedName(R)
<< " and " << getQualifiedName(Reg->getDef())
<< " specified multiple times!\n";
RegisterAliases[R].insert(Reg->getDef());
if (RegisterAliases[Reg->getDef()].count(R))
std::cerr << "Warning: register alias between " << getQualifiedName(R)
<< " and " << getQualifiedName(Reg->getDef())
<< " specified multiple times!\n";
RegisterAliases[Reg->getDef()].insert(R);
}
}
if (!RegisterAliases.empty())
OS << "\n\n // Register Alias Sets...\n";
// Loop over all of the registers which have aliases, emitting the alias list
// to memory.
for (std::map<Record*, std::set<Record*> >::iterator
I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
for (std::set<Record*>::iterator ASI = I->second.begin(),
E = I->second.end(); ASI != E; ++ASI)
OS << getQualifiedName(*ASI) << ", ";
OS << "0 };\n";
}
OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
// Now that register alias sets have been emitted, emit the register
// descriptors now.
for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
Record *Reg = Registers[i];
OS << " { \"";
if (!Reg->getValueAsString("Name").empty())
OS << Reg->getValueAsString("Name");
else
OS << Reg->getName();
OS << "\",\t";
if (RegisterAliases.count(Reg))
OS << Reg->getName() << "_AliasSet,\t";
else
OS << "0,\t\t";
OS << "0, 0 },\n";
}
OS << " };\n"; // End of register descriptors...
OS << "}\n\n"; // End of anonymous namespace...
CodeGenTarget Target;
OS << "namespace " << Target.getName() << " { // Register classes\n";
for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
const std::string &Name = RegisterClasses[i]->getName();
if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
OS << " TargetRegisterClass *" << Name << "RegisterClass = &"
<< Name << "Instance;\n";
}
OS << "} // end of namespace " << Target.getName() << "\n\n";
std::string ClassName = Target.getName() + "GenRegisterInfo";
// Emit the constructor of the class...
OS << ClassName << "::" << ClassName
<< "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
<< " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
<< ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
<< " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
// Emit the getCalleeSaveRegs method...
OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
<< " static const unsigned CalleeSaveRegs[] = {\n ";
const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters();
for (unsigned i = 0, e = CSR.size(); i != e; ++i)
OS << getQualifiedName(CSR[i]) << ", ";
OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";
}
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