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"
20 // runEnums - Print out enum values for all of the instructions.
21 void InstrInfoEmitter::runEnums(std::ostream &OS) {
22 EmitSourceFileHeader("Target Instruction Enum Values", OS);
23 OS << "namespace llvm {\n\n";
27 // We must emit the PHI opcode first...
28 Record *InstrInfo = Target.getInstructionSet();
30 std::string Namespace = Target.inst_begin()->second.Namespace;
32 if (!Namespace.empty())
33 OS << "namespace " << Namespace << " {\n";
36 std::vector<const CodeGenInstruction*> NumberedInstructions;
37 Target.getInstructionsByEnumValue(NumberedInstructions);
39 for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i) {
40 OS << " " << NumberedInstructions[i]->TheDef->getName()
41 << ", \t// " << i << "\n";
43 OS << " INSTRUCTION_LIST_END\n";
45 if (!Namespace.empty())
47 OS << "} // End llvm namespace \n";
50 void InstrInfoEmitter::printDefList(const std::vector<Record*> &Uses,
51 unsigned Num, std::ostream &OS) const {
52 OS << "static const unsigned ImplicitList" << Num << "[] = { ";
53 for (unsigned i = 0, e = Uses.size(); i != e; ++i)
54 OS << getQualifiedName(Uses[i]) << ", ";
58 static std::vector<Record*> GetOperandInfo(const CodeGenInstruction &Inst) {
59 std::vector<Record*> Result;
60 if (Inst.hasVariableNumberOfOperands)
61 return Result; // No info for variable operand instrs.
63 for (unsigned i = 0, e = Inst.OperandList.size(); i != e; ++i) {
64 if (Inst.OperandList[i].Rec->isSubClassOf("RegisterClass"))
65 Result.push_back(Inst.OperandList[i].Rec);
67 // This might be a multiple operand thing.
68 // FIXME: Targets like X86 have registers in their multi-operand operands.
69 for (unsigned j = 0, e = Inst.OperandList[i].MINumOperands; j != e; ++j)
77 // run - Emit the main instruction description records for the target...
78 void InstrInfoEmitter::run(std::ostream &OS) {
81 EmitSourceFileHeader("Target Instruction Descriptors", OS);
82 OS << "namespace llvm {\n\n";
85 const std::string &TargetName = Target.getName();
86 Record *InstrInfo = Target.getInstructionSet();
87 Record *PHI = InstrInfo->getValueAsDef("PHIInst");
89 // Emit empty implicit uses and defs lists
90 OS << "static const unsigned EmptyImpList[] = { 0 };\n";
92 // Keep track of all of the def lists we have emitted already.
93 std::map<std::vector<Record*>, unsigned> EmittedLists;
94 unsigned ListNumber = 0;
96 // Emit all of the instruction's implicit uses and defs.
97 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
98 E = Target.inst_end(); II != E; ++II) {
99 Record *Inst = II->second.TheDef;
100 std::vector<Record*> Uses = Inst->getValueAsListOfDefs("Uses");
102 unsigned &IL = EmittedLists[Uses];
103 if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
105 std::vector<Record*> Defs = Inst->getValueAsListOfDefs("Defs");
107 unsigned &IL = EmittedLists[Defs];
108 if (!IL) printDefList(Defs, IL = ++ListNumber, OS);
112 std::map<std::vector<Record*>, unsigned> OperandInfosEmitted;
113 unsigned OperandListNum = 0;
114 OperandInfosEmitted[std::vector<Record*>()] = ++OperandListNum;
116 // Emit all of the operand info records.
118 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
119 E = Target.inst_end(); II != E; ++II) {
120 std::vector<Record*> OperandInfo = GetOperandInfo(II->second);
121 unsigned &N = OperandInfosEmitted[OperandInfo];
123 N = ++OperandListNum;
124 OS << "static const TargetOperandInfo OperandInfo" << N << "[] = { ";
125 for (unsigned i = 0, e = OperandInfo.size(); i != e; ++i) {
126 if (Record *RC = OperandInfo[i]) {
127 OS << "{ &" << getQualifiedName(RC) << "RegClass }, ";
136 // Emit all of the TargetInstrDescriptor records.
138 OS << "\nstatic const TargetInstrDescriptor " << TargetName
140 emitRecord(Target.getPHIInstruction(), 0, InstrInfo, EmittedLists,
141 OperandInfosEmitted, OS);
144 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
145 E = Target.inst_end(); II != E; ++II)
146 if (II->second.TheDef != PHI)
147 emitRecord(II->second, ++i, InstrInfo, EmittedLists,
148 OperandInfosEmitted, OS);
150 OS << "} // End llvm namespace \n";
153 void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
155 std::map<std::vector<Record*>, unsigned> &EmittedLists,
156 std::map<std::vector<Record*>, unsigned> &OpInfo,
159 if (Inst.hasVariableNumberOfOperands)
161 else if (!Inst.OperandList.empty())
162 // Each logical operand can be multiple MI operands.
163 NumOperands = Inst.OperandList.back().MIOperandNo +
164 Inst.OperandList.back().MINumOperands;
169 if (Inst.Name.empty())
170 OS << Inst.TheDef->getName();
174 unsigned ItinClass = !IsItineraries ? 0 :
175 ItinClassNumber(Inst.TheDef->getValueAsDef("Itinerary")->getName());
177 OS << "\",\t" << NumOperands << ", -1, 0, false, 0, 0, "
181 // Emit all of the target indepedent flags...
182 if (Inst.isReturn) OS << "|M_RET_FLAG";
183 if (Inst.isBranch) OS << "|M_BRANCH_FLAG";
184 if (Inst.isBarrier) OS << "|M_BARRIER_FLAG";
185 if (Inst.hasDelaySlot) OS << "|M_DELAY_SLOT_FLAG";
186 if (Inst.isCall) OS << "|M_CALL_FLAG";
187 if (Inst.isLoad) OS << "|M_LOAD_FLAG";
188 if (Inst.isStore) OS << "|M_STORE_FLAG";
189 if (Inst.isTwoAddress) OS << "|M_2_ADDR_FLAG";
190 if (Inst.isConvertibleToThreeAddress) OS << "|M_CONVERTIBLE_TO_3_ADDR";
191 if (Inst.isCommutable) OS << "|M_COMMUTABLE";
192 if (Inst.isTerminator) OS << "|M_TERMINATOR_FLAG";
193 if (Inst.usesCustomDAGSchedInserter)
194 OS << "|M_USES_CUSTOM_DAG_SCHED_INSERTION";
197 // Emit all of the target-specific flags...
198 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields");
199 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts");
200 if (LI->getSize() != Shift->getSize())
201 throw "Lengths of " + InstrInfo->getName() +
202 ":(TargetInfoFields, TargetInfoPositions) must be equal!";
204 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
205 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
206 dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
210 // Emit the implicit uses and defs lists...
211 std::vector<Record*> UseList = Inst.TheDef->getValueAsListOfDefs("Uses");
213 OS << "EmptyImpList, ";
215 OS << "ImplicitList" << EmittedLists[UseList] << ", ";
217 std::vector<Record*> DefList = Inst.TheDef->getValueAsListOfDefs("Defs");
219 OS << "EmptyImpList, ";
221 OS << "ImplicitList" << EmittedLists[DefList] << ", ";
223 // Emit the operand info.
224 std::vector<Record*> OperandInfo = GetOperandInfo(Inst);
225 if (OperandInfo.empty())
228 OS << "OperandInfo" << OpInfo[OperandInfo];
230 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
234 bool operator()(const Record *Rec1, const Record *Rec2) const {
235 return Rec1->getName() < Rec2->getName();
238 void InstrInfoEmitter::GatherItinClasses() {
239 std::vector<Record*> DefList =
240 Records.getAllDerivedDefinitions("InstrItinClass");
241 IsItineraries = !DefList.empty();
243 if (!IsItineraries) return;
245 sort(DefList.begin(), DefList.end(), LessRecord());
247 for (unsigned i = 0, N = DefList.size(); i < N; i++) {
248 Record *Def = DefList[i];
249 ItinClassMap[Def->getName()] = i + 1;
253 unsigned InstrInfoEmitter::ItinClassNumber(std::string ItinName) {
254 return ItinClassMap[ItinName];
257 void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val,
258 IntInit *ShiftInt, std::ostream &OS) {
259 if (Val == 0 || ShiftInt == 0)
260 throw std::string("Illegal value or shift amount in TargetInfo*!");
261 RecordVal *RV = R->getValue(Val->getValue());
262 int Shift = ShiftInt->getValue();
264 if (RV == 0 || RV->getValue() == 0)
265 throw R->getName() + " doesn't have a field named '" + Val->getValue()+"'!";
267 Init *Value = RV->getValue();
268 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
269 if (BI->getValue()) OS << "|(1<<" << Shift << ")";
271 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) {
272 // Convert the Bits to an integer to print...
273 Init *I = BI->convertInitializerTo(new IntRecTy());
275 if (IntInit *II = dynamic_cast<IntInit*>(I)) {
277 OS << "|(" << II->getValue() << "<<" << Shift << ")";
281 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
282 if (II->getValue()) OS << "|(" << II->getValue() << "<<" << Shift << ")";
286 std::cerr << "Unhandled initializer: " << *Val << "\n";
287 throw "In record '" + R->getName() + "' for TSFlag emission.";