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llvm-6502/utils/TableGen/InstrInfoEmitter.cpp
Chris Lattner 65303d6bd7 Teach tblgen about instruction operands that have multiple MachineInstr 
operands, digging into them to find register values (used on X86).  Patch
by Evan Cheng!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24424 91177308-0d34-0410-b5e6-96231b3b80d8
2005-11-19 07:05:57 +00:00

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//===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
//
// 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 the target
// instruction set for the code generator.
//
//===----------------------------------------------------------------------===//
#include "InstrInfoEmitter.h"
#include "CodeGenTarget.h"
#include "Record.h"
#include <algorithm>
using namespace llvm;
// runEnums - Print out enum values for all of the instructions.
void InstrInfoEmitter::runEnums(std::ostream &OS) {
EmitSourceFileHeader("Target Instruction Enum Values", OS);
OS << "namespace llvm {\n\n";
CodeGenTarget Target;
// We must emit the PHI opcode first...
Record *InstrInfo = Target.getInstructionSet();
std::string Namespace = Target.inst_begin()->second.Namespace;
if (!Namespace.empty())
OS << "namespace " << Namespace << " {\n";
OS << " enum {\n";
std::vector<const CodeGenInstruction*> NumberedInstructions;
Target.getInstructionsByEnumValue(NumberedInstructions);
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
OS << " " << NumberedInstructions[i]->TheDef->getName()
<< ", \t// " << i << "\n";
}
OS << " INSTRUCTION_LIST_END\n";
OS << " };\n";
if (!Namespace.empty())
OS << "}\n";
OS << "} // End llvm namespace \n";
}
void InstrInfoEmitter::printDefList(const std::vector<Record*> &Uses,
unsigned Num, std::ostream &OS) const {
OS << "static const unsigned ImplicitList" << Num << "[] = { ";
for (unsigned i = 0, e = Uses.size(); i != e; ++i)
OS << getQualifiedName(Uses[i]) << ", ";
OS << "0 };\n";
}
static std::vector<Record*> GetOperandInfo(const CodeGenInstruction &Inst) {
std::vector<Record*> Result;
if (Inst.hasVariableNumberOfOperands)
return Result; // No info for variable operand instrs.
for (unsigned i = 0, e = Inst.OperandList.size(); i != e; ++i) {
if (Inst.OperandList[i].Rec->isSubClassOf("RegisterClass")) {
Result.push_back(Inst.OperandList[i].Rec);
} else {
// This might be a multiple operand thing.
// Targets like X86 have registers in their multi-operand operands.
DagInit *MIOI = Inst.OperandList[i].MIOperandInfo;
unsigned NumDefs = MIOI->getNumArgs();
for (unsigned j = 0, e = Inst.OperandList[i].MINumOperands; j != e; ++j) {
if (NumDefs <= j) {
Result.push_back(0);
} else {
DefInit *Def = dynamic_cast<DefInit*>(MIOI->getArg(j));
Result.push_back(Def ? Def->getDef() : 0);
}
}
}
}
return Result;
}
// run - Emit the main instruction description records for the target...
void InstrInfoEmitter::run(std::ostream &OS) {
GatherItinClasses();
EmitSourceFileHeader("Target Instruction Descriptors", OS);
OS << "namespace llvm {\n\n";
CodeGenTarget Target;
const std::string &TargetName = Target.getName();
Record *InstrInfo = Target.getInstructionSet();
Record *PHI = InstrInfo->getValueAsDef("PHIInst");
// Emit empty implicit uses and defs lists
OS << "static const unsigned EmptyImpList[] = { 0 };\n";
// Keep track of all of the def lists we have emitted already.
std::map<std::vector<Record*>, unsigned> EmittedLists;
unsigned ListNumber = 0;
// Emit all of the instruction's implicit uses and defs.
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II) {
Record *Inst = II->second.TheDef;
std::vector<Record*> Uses = Inst->getValueAsListOfDefs("Uses");
if (!Uses.empty()) {
unsigned &IL = EmittedLists[Uses];
if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
}
std::vector<Record*> Defs = Inst->getValueAsListOfDefs("Defs");
if (!Defs.empty()) {
unsigned &IL = EmittedLists[Defs];
if (!IL) printDefList(Defs, IL = ++ListNumber, OS);
}
}
std::map<std::vector<Record*>, unsigned> OperandInfosEmitted;
unsigned OperandListNum = 0;
OperandInfosEmitted[std::vector<Record*>()] = ++OperandListNum;
// Emit all of the operand info records.
OS << "\n";
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II) {
std::vector<Record*> OperandInfo = GetOperandInfo(II->second);
unsigned &N = OperandInfosEmitted[OperandInfo];
if (N == 0) {
N = ++OperandListNum;
OS << "static const TargetOperandInfo OperandInfo" << N << "[] = { ";
for (unsigned i = 0, e = OperandInfo.size(); i != e; ++i) {
Record *RC = OperandInfo[i];
// FIXME: We only care about register operands for now.
if (RC && RC->isSubClassOf("RegisterClass")) {
OS << "{ &" << getQualifiedName(RC) << "RegClass }, ";
} else {
OS << "{ 0 }, ";
}
}
OS << "};\n";
}
}
// Emit all of the TargetInstrDescriptor records.
//
OS << "\nstatic const TargetInstrDescriptor " << TargetName
<< "Insts[] = {\n";
emitRecord(Target.getPHIInstruction(), 0, InstrInfo, EmittedLists,
OperandInfosEmitted, OS);
unsigned i = 0;
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II)
if (II->second.TheDef != PHI)
emitRecord(II->second, ++i, InstrInfo, EmittedLists,
OperandInfosEmitted, OS);
OS << "};\n";
OS << "} // End llvm namespace \n";
}
void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
Record *InstrInfo,
std::map<std::vector<Record*>, unsigned> &EmittedLists,
std::map<std::vector<Record*>, unsigned> &OpInfo,
std::ostream &OS) {
int NumOperands;
if (Inst.hasVariableNumberOfOperands)
NumOperands = -1;
else if (!Inst.OperandList.empty())
// Each logical operand can be multiple MI operands.
NumOperands = Inst.OperandList.back().MIOperandNo +
Inst.OperandList.back().MINumOperands;
else
NumOperands = 0;
OS << " { \"";
if (Inst.Name.empty())
OS << Inst.TheDef->getName();
else
OS << Inst.Name;
unsigned ItinClass = !IsItineraries ? 0 :
ItinClassNumber(Inst.TheDef->getValueAsDef("Itinerary")->getName());
OS << "\",\t" << NumOperands << ", -1, 0, false, 0, 0, "
<< ItinClass
<< ", 0";
// Emit all of the target indepedent flags...
if (Inst.isReturn) OS << "|M_RET_FLAG";
if (Inst.isBranch) OS << "|M_BRANCH_FLAG";
if (Inst.isBarrier) OS << "|M_BARRIER_FLAG";
if (Inst.hasDelaySlot) OS << "|M_DELAY_SLOT_FLAG";
if (Inst.isCall) OS << "|M_CALL_FLAG";
if (Inst.isLoad) OS << "|M_LOAD_FLAG";
if (Inst.isStore) OS << "|M_STORE_FLAG";
if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG";
if (Inst.isConvertibleToThreeAddress) OS << "|M_CONVERTIBLE_TO_3_ADDR";
if (Inst.isCommutable) OS << "|M_COMMUTABLE";
if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG";
if (Inst.usesCustomDAGSchedInserter)
OS << "|M_USES_CUSTOM_DAG_SCHED_INSERTION";
OS << ", 0";
// Emit all of the target-specific flags...
ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields");
ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts");
if (LI->getSize() != Shift->getSize())
throw "Lengths of " + InstrInfo->getName() +
":(TargetInfoFields, TargetInfoPositions) must be equal!";
for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
OS << ", ";
// Emit the implicit uses and defs lists...
std::vector<Record*> UseList = Inst.TheDef->getValueAsListOfDefs("Uses");
if (UseList.empty())
OS << "EmptyImpList, ";
else
OS << "ImplicitList" << EmittedLists[UseList] << ", ";
std::vector<Record*> DefList = Inst.TheDef->getValueAsListOfDefs("Defs");
if (DefList.empty())
OS << "EmptyImpList, ";
else
OS << "ImplicitList" << EmittedLists[DefList] << ", ";
// Emit the operand info.
std::vector<Record*> OperandInfo = GetOperandInfo(Inst);
if (OperandInfo.empty())
OS << "0";
else
OS << "OperandInfo" << OpInfo[OperandInfo];
OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
}
struct LessRecord {
bool operator()(const Record *Rec1, const Record *Rec2) const {
return Rec1->getName() < Rec2->getName();
}
};
void InstrInfoEmitter::GatherItinClasses() {
std::vector<Record*> DefList =
Records.getAllDerivedDefinitions("InstrItinClass");
IsItineraries = !DefList.empty();
if (!IsItineraries) return;
sort(DefList.begin(), DefList.end(), LessRecord());
for (unsigned i = 0, N = DefList.size(); i < N; i++) {
Record *Def = DefList[i];
ItinClassMap[Def->getName()] = i;
}
}
unsigned InstrInfoEmitter::ItinClassNumber(std::string ItinName) {
return ItinClassMap[ItinName];
}
void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val,
IntInit *ShiftInt, std::ostream &OS) {
if (Val == 0 || ShiftInt == 0)
throw std::string("Illegal value or shift amount in TargetInfo*!");
RecordVal *RV = R->getValue(Val->getValue());
int Shift = ShiftInt->getValue();
if (RV == 0 || RV->getValue() == 0)
throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!";
Init *Value = RV->getValue();
if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
if (BI->getValue()) OS << "|(1<<" << Shift << ")";
return;
} else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) {
// Convert the Bits to an integer to print...
Init *I = BI->convertInitializerTo(new IntRecTy());
if (I)
if (IntInit *II = dynamic_cast<IntInit*>(I)) {
if (II->getValue())
OS << "|(" << II->getValue() << "<<" << Shift << ")";
return;
}
} else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")";
return;
}
std::cerr << "Unhandled initializer: " << *Val << "\n";
throw "In record '" + R->getName() + "' for TSFlag emission.";
}
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