mirror of
https://github.com/c64scene-ar/llvm-6502.git
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73ff5120eb
and TargetInstrDescriptor::ImplicitUses to always point to a null
terminated array and never be null. So there is no need to check for
pointer validity when iterating over those sets. Code that looked
like:
if (const unsigned* AS = TID.ImplicitDefs) {
for (int i = 0; AS[i]; ++i) {
// use AS[i]
}
}
was changed to:
for (const unsigned* AS = TID.ImplicitDefs; *AS; ++AS) {
// use *AS
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8960 91177308-0d34-0410-b5e6-96231b3b80d8
237 lines
9.2 KiB
C++
237 lines
9.2 KiB
C++
//===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
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//
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// This tablegen backend is responsible for emitting a description of a target
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// register file for a code generator. It uses instances of the Register,
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// RegisterAliases, and RegisterClass classes to gather this information.
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//
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//===----------------------------------------------------------------------===//
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#include "RegisterInfoEmitter.h"
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#include "CodeGenWrappers.h"
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#include "Record.h"
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#include "Support/StringExtras.h"
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#include <set>
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// runEnums - Print out enum values for all of the registers.
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void RegisterInfoEmitter::runEnums(std::ostream &OS) {
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std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
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if (Registers.size() == 0)
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throw std::string("No 'Register' subclasses defined!");
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std::string Namespace = Registers[0]->getValueAsString("Namespace");
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EmitSourceFileHeader("Target Register Enum Values", OS);
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if (!Namespace.empty())
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OS << "namespace " << Namespace << " {\n";
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OS << " enum {\n NoRegister,\n";
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for (unsigned i = 0, e = Registers.size(); i != e; ++i)
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OS << " " << Registers[i]->getName() << ", \t// " << i+1 << "\n";
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OS << " };\n";
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if (!Namespace.empty())
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OS << "}\n";
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}
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void RegisterInfoEmitter::runHeader(std::ostream &OS) {
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EmitSourceFileHeader("Register Information Header Fragment", OS);
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const std::string &TargetName = CodeGenTarget().getName();
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std::string ClassName = TargetName + "GenRegisterInfo";
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OS << "#include \"llvm/Target/MRegisterInfo.h\"\n\n";
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OS << "struct " << ClassName << " : public MRegisterInfo {\n"
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<< " " << ClassName
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<< "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
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<< " const unsigned* getCalleeSaveRegs() const;\n"
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<< "};\n\n";
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std::vector<Record*> RegisterClasses =
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Records.getAllDerivedDefinitions("RegisterClass");
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OS << "namespace " << TargetName << " { // Register classes\n";
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for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
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if (RegisterClasses[i]->getValueAsBit("isDummyClass"))
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continue; // Ignore dummies
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const std::string &Name = RegisterClasses[i]->getName();
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if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
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OS << " extern TargetRegisterClass *" << Name << "RegisterClass;\n";
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}
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OS << "} // end of namespace " << TargetName << "\n\n";
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}
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// RegisterInfoEmitter::run - Main register file description emitter.
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//
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void RegisterInfoEmitter::run(std::ostream &OS) {
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EmitSourceFileHeader("Register Information Source Fragment", OS);
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// Start out by emitting each of the register classes... to do this, we build
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// a set of registers which belong to a register class, this is to ensure that
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// each register is only in a single register class.
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//
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std::vector<Record*> RegisterClasses =
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Records.getAllDerivedDefinitions("RegisterClass");
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std::vector<Record*> Registers = Records.getAllDerivedDefinitions("Register");
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std::set<Record*> RegistersFound;
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std::vector<std::string> RegClassNames;
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// Loop over all of the register classes... emitting each one.
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OS << "namespace { // Register classes...\n";
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for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
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Record *RC = RegisterClasses[rc];
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if (RC->getValueAsBit("isDummyClass")) continue; // Ignore dummies
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std::string Name = RC->getName();
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if (Name.size() > 9 && Name[9] == '.') {
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static unsigned AnonCounter = 0;
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Name = "AnonRegClass_"+utostr(AnonCounter++);
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}
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RegClassNames.push_back(Name);
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// Emit the register list now...
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OS << " // " << Name << " Register Class...\n const unsigned " << Name
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<< "[] = {\n ";
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ListInit *RegList = RC->getValueAsListInit("MemberList");
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for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
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DefInit *RegDef = dynamic_cast<DefInit*>(RegList->getElement(i));
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if (!RegDef) throw "Register class member is not a record!";
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Record *Reg = RegDef->getDef();
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if (!Reg->isSubClassOf("Register"))
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throw "Register Class member '" + Reg->getName() +
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" does not derive from the Register class!";
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if (RegistersFound.count(Reg))
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throw "Register '" + Reg->getName() +
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"' included in multiple register classes!";
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RegistersFound.insert(Reg);
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OS << getQualifiedName(Reg) << ", ";
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}
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OS << "\n };\n\n";
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OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
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<< " " << Name << "Class() : TargetRegisterClass("
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<< RC->getValueAsInt("Size")/8 << ", " << RC->getValueAsInt("Alignment")
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<< ", " << Name << ", " << Name << " + " << RegList->getSize()
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<< ") {}\n";
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if (CodeInit *CI = dynamic_cast<CodeInit*>(RC->getValueInit("Methods")))
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OS << CI->getValue();
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else
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throw "Expected 'code' fragment for 'Methods' value in register class '"+
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RC->getName() + "'!";
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OS << " } " << Name << "Instance;\n\n";
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}
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OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
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for (unsigned i = 0, e = RegClassNames.size(); i != e; ++i)
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OS << " &" << RegClassNames[i] << "Instance,\n";
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OS << " };\n";
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// Emit register class aliases...
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std::vector<Record*> RegisterAliasesRecs =
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Records.getAllDerivedDefinitions("RegisterAliases");
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std::map<Record*, std::set<Record*> > RegisterAliases;
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for (unsigned i = 0, e = RegisterAliasesRecs.size(); i != e; ++i) {
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Record *AS = RegisterAliasesRecs[i];
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Record *R = AS->getValueAsDef("Reg");
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ListInit *LI = AS->getValueAsListInit("Aliases");
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// Add information that R aliases all of the elements in the list... and
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// that everything in the list aliases R.
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for (unsigned j = 0, e = LI->getSize(); j != e; ++j) {
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DefInit *Reg = dynamic_cast<DefInit*>(LI->getElement(j));
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if (!Reg) throw "ERROR: Alias list element is not a def!";
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if (RegisterAliases[R].count(Reg->getDef()))
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std::cerr << "Warning: register alias between " << getQualifiedName(R)
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<< " and " << getQualifiedName(Reg->getDef())
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<< " specified multiple times!\n";
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RegisterAliases[R].insert(Reg->getDef());
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if (RegisterAliases[Reg->getDef()].count(R))
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std::cerr << "Warning: register alias between " << getQualifiedName(R)
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<< " and " << getQualifiedName(Reg->getDef())
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<< " specified multiple times!\n";
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RegisterAliases[Reg->getDef()].insert(R);
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}
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}
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if (!RegisterAliases.empty())
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OS << "\n\n // Register Alias Sets...\n";
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// Emit the empty alias list
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OS << " const unsigned Empty_AliasSet[] = { 0 };\n";
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// Loop over all of the registers which have aliases, emitting the alias list
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// to memory.
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for (std::map<Record*, std::set<Record*> >::iterator
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I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
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OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
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for (std::set<Record*>::iterator ASI = I->second.begin(),
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E = I->second.end(); ASI != E; ++ASI)
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OS << getQualifiedName(*ASI) << ", ";
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OS << "0 };\n";
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}
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OS << "\n const MRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
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OS << " { \"NOREG\",\t0,\t\t0,\t0 },\n";
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// Now that register alias sets have been emitted, emit the register
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// descriptors now.
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for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
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Record *Reg = Registers[i];
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OS << " { \"";
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if (!Reg->getValueAsString("Name").empty())
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OS << Reg->getValueAsString("Name");
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else
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OS << Reg->getName();
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OS << "\",\t";
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if (RegisterAliases.count(Reg))
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OS << Reg->getName() << "_AliasSet,\t";
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else
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OS << "Empty_AliasSet,\t";
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OS << "0, 0 },\n";
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}
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OS << " };\n"; // End of register descriptors...
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OS << "}\n\n"; // End of anonymous namespace...
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CodeGenTarget Target;
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OS << "namespace " << Target.getName() << " { // Register classes\n";
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for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
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if (RegisterClasses[i]->getValueAsBit("isDummyClass"))
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continue; // Ignore dummies
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const std::string &Name = RegisterClasses[i]->getName();
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if (Name.size() < 9 || Name[9] != '.') // Ignore anonymous classes
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OS << " TargetRegisterClass *" << Name << "RegisterClass = &"
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<< Name << "Instance;\n";
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}
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OS << "} // end of namespace " << Target.getName() << "\n\n";
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std::string ClassName = Target.getName() + "GenRegisterInfo";
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// Emit the constructor of the class...
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OS << ClassName << "::" << ClassName
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<< "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
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<< " : MRegisterInfo(RegisterDescriptors, " << Registers.size()+1
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<< ", RegisterClasses, RegisterClasses+" << RegClassNames.size() << ",\n "
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<< " CallFrameSetupOpcode, CallFrameDestroyOpcode) {}\n\n";
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// Emit the getCalleeSaveRegs method...
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OS << "const unsigned* " << ClassName << "::getCalleeSaveRegs() const {\n"
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<< " static const unsigned CalleeSaveRegs[] = {\n ";
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const std::vector<Record*> &CSR = Target.getCalleeSavedRegisters();
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for (unsigned i = 0, e = CSR.size(); i != e; ++i)
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OS << getQualifiedName(CSR[i]) << ", ";
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OS << " 0\n };\n return CalleeSaveRegs;\n}\n\n";
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}
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