1 //===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tablegen backend is responsible for emitting a description of the target
11 // instruction set for the code generator.
13 //===----------------------------------------------------------------------===//
15 #include "InstrInfoEmitter.h"
16 #include "CodeGenTarget.h"
21 // runEnums - Print out enum values for all of the instructions.
22 void InstrInfoEmitter::runEnums(std::ostream &OS) {
23 EmitSourceFileHeader("Target Instruction Enum Values", OS);
24 OS << "namespace llvm {\n\n";
28 // We must emit the PHI opcode first...
29 Record *InstrInfo = Target.getInstructionSet();
31 std::string Namespace = Target.inst_begin()->second.Namespace;
33 if (!Namespace.empty())
34 OS << "namespace " << Namespace << " {\n";
37 std::vector<const CodeGenInstruction*> NumberedInstructions;
38 Target.getInstructionsByEnumValue(NumberedInstructions);
40 for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
41 OS << " " << NumberedInstructions[i]->TheDef->getName()
42 << ", \t// " << i << "\n";
44 OS << " INSTRUCTION_LIST_END\n";
46 if (!Namespace.empty())
48 OS << "} // End llvm namespace \n";
51 void InstrInfoEmitter::printDefList(const std::vector<Record*> &Uses,
52 unsigned Num, std::ostream &OS) const {
53 OS << "static const unsigned ImplicitList" << Num << "[] = { ";
54 for (unsigned i = 0, e = Uses.size(); i != e; ++i)
55 OS << getQualifiedName(Uses[i]) << ", ";
59 static std::vector<Record*> GetOperandInfo(const CodeGenInstruction &Inst) {
60 std::vector<Record*> Result;
61 if (Inst.hasVariableNumberOfOperands)
62 return Result; // No info for variable operand instrs.
64 for (unsigned i = 0, e = Inst.OperandList.size(); i != e; ++i) {
65 if (Inst.OperandList[i].Rec->isSubClassOf("RegisterClass")) {
66 Result.push_back(Inst.OperandList[i].Rec);
68 // This might be a multiple operand thing.
69 // Targets like X86 have registers in their multi-operand operands.
70 DagInit *MIOI = Inst.OperandList[i].MIOperandInfo;
71 unsigned NumDefs = MIOI->getNumArgs();
72 for (unsigned j = 0, e = Inst.OperandList[i].MINumOperands; j != e; ++j) {
76 DefInit *Def = dynamic_cast<DefInit*>(MIOI->getArg(j));
77 Result.push_back(Def ? Def->getDef() : 0);
86 // run - Emit the main instruction description records for the target...
87 void InstrInfoEmitter::run(std::ostream &OS) {
90 EmitSourceFileHeader("Target Instruction Descriptors", OS);
91 OS << "namespace llvm {\n\n";
94 const std::string &TargetName = Target.getName();
95 Record *InstrInfo = Target.getInstructionSet();
96 Record *PHI = InstrInfo->getValueAsDef("PHIInst");
98 // Emit empty implicit uses and defs lists
99 OS << "static const unsigned EmptyImpList[] = { 0 };\n";
101 // Keep track of all of the def lists we have emitted already.
102 std::map<std::vector<Record*>, unsigned> EmittedLists;
103 unsigned ListNumber = 0;
105 // Emit all of the instruction's implicit uses and defs.
106 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
107 E = Target.inst_end(); II != E; ++II) {
108 Record *Inst = II->second.TheDef;
109 std::vector<Record*> Uses = Inst->getValueAsListOfDefs("Uses");
111 unsigned &IL = EmittedLists[Uses];
112 if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
114 std::vector<Record*> Defs = Inst->getValueAsListOfDefs("Defs");
116 unsigned &IL = EmittedLists[Defs];
117 if (!IL) printDefList(Defs, IL = ++ListNumber, OS);
121 std::map<std::vector<Record*>, unsigned> OperandInfosEmitted;
122 unsigned OperandListNum = 0;
123 OperandInfosEmitted[std::vector<Record*>()] = ++OperandListNum;
125 // Emit all of the operand info records.
127 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
128 E = Target.inst_end(); II != E; ++II) {
129 std::vector<Record*> OperandInfo = GetOperandInfo(II->second);
130 unsigned &N = OperandInfosEmitted[OperandInfo];
132 N = ++OperandListNum;
133 OS << "static const TargetOperandInfo OperandInfo" << N << "[] = { ";
134 for (unsigned i = 0, e = OperandInfo.size(); i != e; ++i) {
135 Record *RC = OperandInfo[i];
136 // FIXME: We only care about register operands for now.
137 if (RC && RC->isSubClassOf("RegisterClass")) {
138 OS << "{ &" << getQualifiedName(RC) << "RegClass }, ";
147 // Emit all of the TargetInstrDescriptor records.
149 OS << "\nstatic const TargetInstrDescriptor " << TargetName
151 emitRecord(Target.getPHIInstruction(), 0, InstrInfo, EmittedLists,
152 OperandInfosEmitted, OS);
155 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
156 E = Target.inst_end(); II != E; ++II)
157 if (II->second.TheDef != PHI)
158 emitRecord(II->second, ++i, InstrInfo, EmittedLists,
159 OperandInfosEmitted, OS);
161 OS << "} // End llvm namespace \n";
164 void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
166 std::map<std::vector<Record*>, unsigned> &EmittedLists,
167 std::map<std::vector<Record*>, unsigned> &OpInfo,
170 if (Inst.hasVariableNumberOfOperands)
172 else if (!Inst.OperandList.empty())
173 // Each logical operand can be multiple MI operands.
174 NumOperands = Inst.OperandList.back().MIOperandNo +
175 Inst.OperandList.back().MINumOperands;
180 if (Inst.Name.empty())
181 OS << Inst.TheDef->getName();
185 unsigned ItinClass = !IsItineraries ? 0 :
186 ItinClassNumber(Inst.TheDef->getValueAsDef("Itinerary")->getName());
188 OS << "\",\t" << NumOperands << ", -1, 0, false, 0, 0, "
192 // Emit all of the target indepedent flags...
193 if (Inst.isReturn) OS << "|M_RET_FLAG";
194 if (Inst.isBranch) OS << "|M_BRANCH_FLAG";
195 if (Inst.isBarrier) OS << "|M_BARRIER_FLAG";
196 if (Inst.hasDelaySlot) OS << "|M_DELAY_SLOT_FLAG";
197 if (Inst.isCall) OS << "|M_CALL_FLAG";
198 if (Inst.isLoad) OS << "|M_LOAD_FLAG";
199 if (Inst.isStore) OS << "|M_STORE_FLAG";
200 if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG";
201 if (Inst.isConvertibleToThreeAddress) OS << "|M_CONVERTIBLE_TO_3_ADDR";
202 if (Inst.isCommutable) OS << "|M_COMMUTABLE";
203 if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG";
204 if (Inst.usesCustomDAGSchedInserter)
205 OS << "|M_USES_CUSTOM_DAG_SCHED_INSERTION";
208 // Emit all of the target-specific flags...
209 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields");
210 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts");
211 if (LI->getSize() != Shift->getSize())
212 throw "Lengths of " + InstrInfo->getName() +
213 ":(TargetInfoFields, TargetInfoPositions) must be equal!";
215 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
216 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
217 dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
221 // Emit the implicit uses and defs lists...
222 std::vector<Record*> UseList = Inst.TheDef->getValueAsListOfDefs("Uses");
224 OS << "EmptyImpList, ";
226 OS << "ImplicitList" << EmittedLists[UseList] << ", ";
228 std::vector<Record*> DefList = Inst.TheDef->getValueAsListOfDefs("Defs");
230 OS << "EmptyImpList, ";
232 OS << "ImplicitList" << EmittedLists[DefList] << ", ";
234 // Emit the operand info.
235 std::vector<Record*> OperandInfo = GetOperandInfo(Inst);
236 if (OperandInfo.empty())
239 OS << "OperandInfo" << OpInfo[OperandInfo];
241 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
245 bool operator()(const Record *Rec1, const Record *Rec2) const {
246 return Rec1->getName() < Rec2->getName();
249 void InstrInfoEmitter::GatherItinClasses() {
250 std::vector<Record*> DefList =
251 Records.getAllDerivedDefinitions("InstrItinClass");
252 IsItineraries = !DefList.empty();
254 if (!IsItineraries) return;
256 sort(DefList.begin(), DefList.end(), LessRecord());
258 for (unsigned i = 0, N = DefList.size(); i < N; i++) {
259 Record *Def = DefList[i];
260 ItinClassMap[Def->getName()] = i;
264 unsigned InstrInfoEmitter::ItinClassNumber(std::string ItinName) {
265 return ItinClassMap[ItinName];
268 void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val,
269 IntInit *ShiftInt, std::ostream &OS) {
270 if (Val == 0 || ShiftInt == 0)
271 throw std::string("Illegal value or shift amount in TargetInfo*!");
272 RecordVal *RV = R->getValue(Val->getValue());
273 int Shift = ShiftInt->getValue();
275 if (RV == 0 || RV->getValue() == 0)
276 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!";
278 Init *Value = RV->getValue();
279 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
280 if (BI->getValue()) OS << "|(1<<" << Shift << ")";
282 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) {
283 // Convert the Bits to an integer to print...
284 Init *I = BI->convertInitializerTo(new IntRecTy());
286 if (IntInit *II = dynamic_cast<IntInit*>(I)) {
288 OS << "|(" << II->getValue() << "<<" << Shift << ")";
292 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
293 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")";
297 std::cerr << "Unhandled initializer: " << *Val << "\n";
298 throw "In record '" + R->getName() + "' for TSFlag emission.";