//===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This tablegen backend is responsible for emitting a description of a target
// register file for a code generator. It uses instances of the Register,
//===----------------------------------------------------------------------===//
#include "RegisterInfoEmitter.h"
+#include "CodeGenTarget.h"
+#include "CodeGenRegisters.h"
#include "Record.h"
-#include "Support/StringExtras.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/STLExtras.h"
#include <set>
-
-static void EmitSourceHeader(const std::string &Desc, std::ostream &o) {
- o << "//===- TableGen'erated file -------------------------------------*-"
- " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
- "d file, do not edit!\n//\n//===------------------------------------"
- "----------------------------------===//\n\n";
-}
+using namespace llvm;
// 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!");
+ CodeGenTarget Target;
+ const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
- std::string Namespace = Registers[0]->getValueAsString("Namespace");
+ std::string Namespace = Registers[0].TheDef->getValueAsString("Namespace");
- EmitSourceHeader("Target Register Enum Values", OS);
+ EmitSourceFileHeader("Target Register Enum Values", OS);
+ OS << "namespace llvm {\n\n";
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() << ",\n";
+ OS << " " << Registers[i].getName() << ", \t// " << i+1 << "\n";
OS << " };\n";
if (!Namespace.empty())
OS << "}\n";
+ OS << "} // End llvm namespace \n";
}
void RegisterInfoEmitter::runHeader(std::ostream &OS) {
- std::vector<Record*> RegisterInfos =
- Records.getAllDerivedDefinitions("RegisterInfo");
-
- if (RegisterInfos.size() != 1)
- throw std::string("ERROR: Multiple subclasses of RegisterInfo defined!");
-
- EmitSourceHeader("Register Information Header Fragment", OS);
-
- std::string ClassName = RegisterInfos[0]->getValueAsString("ClassName");
+ EmitSourceFileHeader("Register Information Header Fragment", OS);
+ CodeGenTarget Target;
+ const std::string &TargetName = Target.getName();
+ std::string ClassName = TargetName + "GenRegisterInfo";
OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
+ OS << "namespace llvm {\n\n";
+
OS << "struct " << ClassName << " : public MRegisterInfo {\n"
- << " " << ClassName << "();\n"
+ << " " << ClassName
+ << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
<< " const unsigned* getCalleeSaveRegs() const;\n"
<< "};\n\n";
-}
-static std::string getQualifiedRecordName(Record *R) {
- std::string Namespace = R->getValueAsString("Namespace");
- if (Namespace.empty()) return R->getName();
- return Namespace + "::" + R->getName();
+ 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";
+ OS << "} // End llvm namespace \n";
}
// RegisterInfoEmitter::run - Main register file description emitter.
//
void RegisterInfoEmitter::run(std::ostream &OS) {
- EmitSourceHeader("Register Information Source Fragment", OS);
+ CodeGenTarget Target;
+ EmitSourceFileHeader("Register Information Source Fragment", OS);
+
+ OS << "namespace llvm {\n\n";
// 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");
- Record *RegisterClass = Records.getClass("Register");
+ const std::vector<CodeGenRegisterClass> &RegisterClasses =
+ Target.getRegisterClasses();
std::set<Record*> RegistersFound;
+ std::vector<std::string> RegClassNames;
// Loop over all of the register classes... emitting each one.
OS << "namespace { // Register classes...\n";
- std::vector<std::string> RegisterClassNames;
+
+ // RegClassesBelongedTo - Keep track of which register classes each reg
+ // belongs to.
+ std::multimap<Record*, const CodeGenRegisterClass*> RegClassesBelongedTo;
+
for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
- Record *RC = RegisterClasses[rc];
- std::string Name = RC->getName();
- if (Name[9] == '.') {
+ const CodeGenRegisterClass &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) {
- Record *Reg = RegList->getElement(i);
- if (!Reg->isSubClassOf(RegisterClass))
- throw "Register Class member '" + Reg->getName() +
- " does not derive from the Register class!";
+ for (unsigned i = 0, e = RC.Elements.size(); i != e; ++i) {
+ Record *Reg = RC.Elements[i];
if (RegistersFound.count(Reg))
throw "Register '" + Reg->getName() +
"' included in multiple register classes!";
- OS << getQualifiedRecordName(Reg) << ", ";
+ RegistersFound.insert(Reg);
+ OS << getQualifiedName(Reg) << ", ";
+
+ // Keep track of which regclasses this register is in.
+ RegClassesBelongedTo.insert(std::make_pair(Reg, &RC));
}
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();
+ << RC.SpillSize/8 << ", " << RC.SpillAlignment/8 << ", " << Name << ", "
+ << Name << " + " << RC.Elements.size() << ") {}\n"
+ << RC.MethodDefinitions << " } " << 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";
+
+ // Emit the empty alias list
+ OS << " const unsigned Empty_AliasSet[] = { 0 };\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.
+ const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
+ for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
+ const CodeGenRegister &Reg = Registers[i];
+ OS << " { \"";
+ if (!Reg.TheDef->getValueAsString("Name").empty())
+ OS << Reg.TheDef->getValueAsString("Name");
+ else
+ OS << Reg.getName();
+ OS << "\",\t";
+ if (RegisterAliases.count(Reg.TheDef))
+ OS << Reg.getName() << "_AliasSet,\t";
else
- throw "Expected 'code' fragment for 'Methods' value in register class '"+
- RC->getName() + "'!";
+ OS << "Empty_AliasSet,\t";
- OS << " } " << Name << "Instance;\n\n";
+ // Figure out what the size and alignment of the spill slots are for this
+ // reg. This may be explicitly declared in the register, or it may be
+ // inferred from the register classes it is part of.
+ std::multimap<Record*, const CodeGenRegisterClass*>::iterator I, E;
+ tie(I, E) = RegClassesBelongedTo.equal_range(Reg.TheDef);
+ unsigned SpillSize = Reg.DeclaredSpillSize;
+ unsigned SpillAlign = Reg.DeclaredSpillAlignment;
+ for (; I != E; ++I) { // For each reg class this belongs to.
+ const CodeGenRegisterClass *RC = I->second;
+ if (SpillSize == 0)
+ SpillSize = RC->SpillSize;
+ else if (SpillSize != RC->SpillSize)
+ throw "Spill size for regclass '" + RC->getName() +
+ "' doesn't match spill sized already inferred for register '" +
+ Reg.getName() + "'!";
+ if (SpillAlign == 0)
+ SpillAlign = RC->SpillAlignment;
+ else if (SpillAlign != RC->SpillAlignment)
+ throw "Spill alignment for regclass '" + RC->getName() +
+ "' doesn't match spill sized already inferred for register '" +
+ Reg.getName() + "'!";
+ }
+
+ OS << SpillSize << ", " << SpillAlign << " },\n";
+ }
+ OS << " };\n"; // End of register descriptors...
+ OS << "}\n\n"; // End of anonymous namespace...
+ 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 ";
- OS << "}\n"; // End of anonymous namespace...
+ 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";
+ OS << "} // End llvm namespace \n";
}
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