1 //===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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"
22 static void PrintDefList(const std::vector<Record*> &Uses,
23 unsigned Num, std::ostream &OS) {
24 OS << "static const unsigned ImplicitList" << Num << "[] = { ";
25 for (unsigned i = 0, e = Uses.size(); i != e; ++i)
26 OS << getQualifiedName(Uses[i]) << ", ";
30 //===----------------------------------------------------------------------===//
31 // Instruction Itinerary Information.
32 //===----------------------------------------------------------------------===//
34 struct RecordNameComparator {
35 bool operator()(const Record *Rec1, const Record *Rec2) const {
36 return Rec1->getName() < Rec2->getName();
40 void InstrInfoEmitter::GatherItinClasses() {
41 std::vector<Record*> DefList =
42 Records.getAllDerivedDefinitions("InstrItinClass");
43 std::sort(DefList.begin(), DefList.end(), RecordNameComparator());
45 for (unsigned i = 0, N = DefList.size(); i < N; i++)
46 ItinClassMap[DefList[i]->getName()] = i;
49 unsigned InstrInfoEmitter::getItinClassNumber(const Record *InstRec) {
50 return ItinClassMap[InstRec->getValueAsDef("Itinerary")->getName()];
53 //===----------------------------------------------------------------------===//
54 // Operand Info Emission.
55 //===----------------------------------------------------------------------===//
57 std::vector<std::string>
58 InstrInfoEmitter::GetOperandInfo(const CodeGenInstruction &Inst) {
59 std::vector<std::string> Result;
61 for (unsigned i = 0, e = Inst.OperandList.size(); i != e; ++i) {
62 // Handle aggregate operands and normal operands the same way by expanding
63 // either case into a list of operands for this op.
64 std::vector<CodeGenInstruction::OperandInfo> OperandList;
66 // This might be a multiple operand thing. Targets like X86 have
67 // registers in their multi-operand operands. It may also be an anonymous
68 // operand, which has a single operand, but no declared class for the
70 DagInit *MIOI = Inst.OperandList[i].MIOperandInfo;
72 if (!MIOI || MIOI->getNumArgs() == 0) {
73 // Single, anonymous, operand.
74 OperandList.push_back(Inst.OperandList[i]);
76 for (unsigned j = 0, e = Inst.OperandList[i].MINumOperands; j != e; ++j) {
77 OperandList.push_back(Inst.OperandList[i]);
79 Record *OpR = dynamic_cast<DefInit*>(MIOI->getArg(j))->getDef();
80 OperandList.back().Rec = OpR;
84 for (unsigned j = 0, e = OperandList.size(); j != e; ++j) {
85 Record *OpR = OperandList[j].Rec;
88 if (OpR->isSubClassOf("RegisterClass"))
89 Res += getQualifiedName(OpR) + "RegClassID, ";
92 // Fill in applicable flags.
95 // Ptr value whose register class is resolved via callback.
96 if (OpR->getName() == "ptr_rc")
97 Res += "|(1<<TOI::LookupPtrRegClass)";
99 // Predicate operands. Check to see if the original unexpanded operand
100 // was of type PredicateOperand.
101 if (Inst.OperandList[i].Rec->isSubClassOf("PredicateOperand"))
102 Res += "|(1<<TOI::Predicate)";
104 // Optional def operands. Check to see if the original unexpanded operand
105 // was of type OptionalDefOperand.
106 if (Inst.OperandList[i].Rec->isSubClassOf("OptionalDefOperand"))
107 Res += "|(1<<TOI::OptionalDef)";
109 // Fill in constraint info.
110 Res += ", " + Inst.OperandList[i].Constraints[j];
111 Result.push_back(Res);
118 void InstrInfoEmitter::EmitOperandInfo(std::ostream &OS,
119 OperandInfoMapTy &OperandInfoIDs) {
120 // ID #0 is for no operand info.
121 unsigned OperandListNum = 0;
122 OperandInfoIDs[std::vector<std::string>()] = ++OperandListNum;
125 const CodeGenTarget &Target = CDP.getTargetInfo();
126 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
127 E = Target.inst_end(); II != E; ++II) {
128 std::vector<std::string> OperandInfo = GetOperandInfo(II->second);
129 unsigned &N = OperandInfoIDs[OperandInfo];
130 if (N != 0) continue;
132 N = ++OperandListNum;
133 OS << "static const TargetOperandInfo OperandInfo" << N << "[] = { ";
134 for (unsigned i = 0, e = OperandInfo.size(); i != e; ++i)
135 OS << "{ " << OperandInfo[i] << " }, ";
140 //===----------------------------------------------------------------------===//
141 // Instruction Analysis
142 //===----------------------------------------------------------------------===//
145 const CodeGenDAGPatterns &CDP;
148 bool &HasSideEffects;
150 InstAnalyzer(const CodeGenDAGPatterns &cdp,
151 bool &maystore, bool &mayload, bool &hse)
152 : CDP(cdp), mayStore(maystore), mayLoad(mayload), HasSideEffects(hse){
155 void Analyze(Record *InstRecord) {
156 const TreePattern *Pattern = CDP.getInstruction(InstRecord).getPattern();
157 if (Pattern == 0) return; // No pattern.
159 // FIXME: Assume only the first tree is the pattern. The others are clobber
161 AnalyzeNode(Pattern->getTree(0));
165 void AnalyzeNode(const TreePatternNode *N) {
170 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i)
171 AnalyzeNode(N->getChild(i));
173 // Ignore set nodes, which are not SDNodes.
174 if (N->getOperator()->getName() == "set")
177 // Get information about the SDNode for the operator.
178 const SDNodeInfo &OpInfo = CDP.getSDNodeInfo(N->getOperator());
180 // If node writes to memory, it obviously stores to memory.
181 if (OpInfo.hasProperty(SDNPMayStore))
184 // If it reads memory, remember this.
185 if (OpInfo.hasProperty(SDNPMayLoad))
188 // If it reads memory, remember this.
189 if (OpInfo.hasProperty(SDNPSideEffect))
190 HasSideEffects = true;
192 if (const CodeGenIntrinsic *IntInfo = N->getIntrinsicInfo(CDP)) {
193 // If this is an intrinsic, analyze it.
194 if (IntInfo->ModRef >= CodeGenIntrinsic::ReadArgMem)
195 mayLoad = true;// These may load memory.
197 if (IntInfo->ModRef >= CodeGenIntrinsic::WriteArgMem)
198 mayStore = true;// Intrinsics that can write to memory are 'mayStore'.
200 if (IntInfo->ModRef >= CodeGenIntrinsic::WriteMem)
201 // WriteMem intrinsics can have other strange effects.
202 HasSideEffects = true;
208 void InstrInfoEmitter::InferFromPattern(const CodeGenInstruction &Inst,
209 bool &MayStore, bool &MayLoad,
210 bool &HasSideEffects) {
211 MayStore = MayLoad = HasSideEffects = false;
213 InstAnalyzer(CDP, MayStore, MayLoad, HasSideEffects).Analyze(Inst.TheDef);
215 // InstAnalyzer only correctly analyzes mayStore/mayLoad so far.
216 if (Inst.mayStore) { // If the .td file explicitly sets mayStore, use it.
217 // If we decided that this is a store from the pattern, then the .td file
218 // entry is redundant.
221 "Warning: mayStore flag explicitly set on instruction '%s'"
222 " but flag already inferred from pattern.\n",
223 Inst.TheDef->getName().c_str());
227 if (Inst.mayLoad) { // If the .td file explicitly sets mayLoad, use it.
228 // If we decided that this is a load from the pattern, then the .td file
229 // entry is redundant.
232 "Warning: mayLoad flag explicitly set on instruction '%s'"
233 " but flag already inferred from pattern.\n",
234 Inst.TheDef->getName().c_str());
238 if (Inst.neverHasSideEffects) {
239 // If we already decided that this instruction has no side effects, then the
240 // .td file entry is redundant.
243 "Warning: neverHasSideEffects flag explicitly set on instruction"
244 " '%s' but flag already inferred from pattern.\n",
245 Inst.TheDef->getName().c_str());
246 HasSideEffects = false;
251 //===----------------------------------------------------------------------===//
253 //===----------------------------------------------------------------------===//
255 // run - Emit the main instruction description records for the target...
256 void InstrInfoEmitter::run(std::ostream &OS) {
259 EmitSourceFileHeader("Target Instruction Descriptors", OS);
260 OS << "namespace llvm {\n\n";
262 CodeGenTarget Target;
263 const std::string &TargetName = Target.getName();
264 Record *InstrInfo = Target.getInstructionSet();
266 // Keep track of all of the def lists we have emitted already.
267 std::map<std::vector<Record*>, unsigned> EmittedLists;
268 unsigned ListNumber = 0;
270 // Emit all of the instruction's implicit uses and defs.
271 for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
272 E = Target.inst_end(); II != E; ++II) {
273 Record *Inst = II->second.TheDef;
274 std::vector<Record*> Uses = Inst->getValueAsListOfDefs("Uses");
276 unsigned &IL = EmittedLists[Uses];
277 if (!IL) PrintDefList(Uses, IL = ++ListNumber, OS);
279 std::vector<Record*> Defs = Inst->getValueAsListOfDefs("Defs");
281 unsigned &IL = EmittedLists[Defs];
282 if (!IL) PrintDefList(Defs, IL = ++ListNumber, OS);
286 OperandInfoMapTy OperandInfoIDs;
288 // Emit all of the operand info records.
289 EmitOperandInfo(OS, OperandInfoIDs);
291 // Emit all of the TargetInstrDesc records in their ENUM ordering.
293 OS << "\nstatic const TargetInstrDesc " << TargetName
295 std::vector<const CodeGenInstruction*> NumberedInstructions;
296 Target.getInstructionsByEnumValue(NumberedInstructions);
298 for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i)
299 emitRecord(*NumberedInstructions[i], i, InstrInfo, EmittedLists,
302 OS << "} // End llvm namespace \n";
305 void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
307 std::map<std::vector<Record*>, unsigned> &EmittedLists,
308 const OperandInfoMapTy &OpInfo,
310 // Determine properties of the instruction from its pattern.
311 bool mayStore, mayLoad, HasSideEffects;
312 InferFromPattern(Inst, mayStore, mayLoad, HasSideEffects);
315 if (!Inst.OperandList.empty())
316 // Each logical operand can be multiple MI operands.
317 MinOperands = Inst.OperandList.back().MIOperandNo +
318 Inst.OperandList.back().MINumOperands;
321 OS << Num << ",\t" << MinOperands << ",\t"
322 << Inst.NumDefs << ",\t" << getItinClassNumber(Inst.TheDef)
323 << ",\t\"" << Inst.TheDef->getName() << "\", 0";
325 // Emit all of the target indepedent flags...
326 if (Inst.isReturn) OS << "|(1<<TID::Return)";
327 if (Inst.isBranch) OS << "|(1<<TID::Branch)";
328 if (Inst.isIndirectBranch) OS << "|(1<<TID::IndirectBranch)";
329 if (Inst.isBarrier) OS << "|(1<<TID::Barrier)";
330 if (Inst.hasDelaySlot) OS << "|(1<<TID::DelaySlot)";
331 if (Inst.isCall) OS << "|(1<<TID::Call)";
332 if (Inst.isSimpleLoad) OS << "|(1<<TID::SimpleLoad)";
333 if (mayLoad) OS << "|(1<<TID::MayLoad)";
334 if (mayStore) OS << "|(1<<TID::MayStore)";
335 if (Inst.isImplicitDef)OS << "|(1<<TID::ImplicitDef)";
336 if (Inst.isPredicable) OS << "|(1<<TID::Predicable)";
337 if (Inst.isConvertibleToThreeAddress) OS << "|(1<<TID::ConvertibleTo3Addr)";
338 if (Inst.isCommutable) OS << "|(1<<TID::Commutable)";
339 if (Inst.isTerminator) OS << "|(1<<TID::Terminator)";
340 if (Inst.isReMaterializable) OS << "|(1<<TID::Rematerializable)";
341 if (Inst.isNotDuplicable) OS << "|(1<<TID::NotDuplicable)";
342 if (Inst.hasOptionalDef) OS << "|(1<<TID::HasOptionalDef)";
343 if (Inst.usesCustomDAGSchedInserter)
344 OS << "|(1<<TID::UsesCustomDAGSchedInserter)";
345 if (Inst.isVariadic) OS << "|(1<<TID::Variadic)";
346 if (Inst.mayHaveSideEffects) OS << "|(1<<TID::MayHaveSideEffects)";
347 if (!HasSideEffects) OS << "|(1<<TID::NeverHasSideEffects)";
350 // Emit all of the target-specific flags...
351 ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields");
352 ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts");
353 if (LI->getSize() != Shift->getSize())
354 throw "Lengths of " + InstrInfo->getName() +
355 ":(TargetInfoFields, TargetInfoPositions) must be equal!";
357 for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
358 emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
359 dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
363 // Emit the implicit uses and defs lists...
364 std::vector<Record*> UseList = Inst.TheDef->getValueAsListOfDefs("Uses");
368 OS << "ImplicitList" << EmittedLists[UseList] << ", ";
370 std::vector<Record*> DefList = Inst.TheDef->getValueAsListOfDefs("Defs");
374 OS << "ImplicitList" << EmittedLists[DefList] << ", ";
376 // Emit the operand info.
377 std::vector<std::string> OperandInfo = GetOperandInfo(Inst);
378 if (OperandInfo.empty())
381 OS << "OperandInfo" << OpInfo.find(OperandInfo)->second;
383 OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
387 void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val,
388 IntInit *ShiftInt, std::ostream &OS) {
389 if (Val == 0 || ShiftInt == 0)
390 throw std::string("Illegal value or shift amount in TargetInfo*!");
391 RecordVal *RV = R->getValue(Val->getValue());
392 int Shift = ShiftInt->getValue();
394 if (RV == 0 || RV->getValue() == 0) {
395 // This isn't an error if this is a builtin instruction.
396 if (R->getName() != "PHI" &&
397 R->getName() != "INLINEASM" &&
398 R->getName() != "LABEL" &&
399 R->getName() != "EXTRACT_SUBREG" &&
400 R->getName() != "INSERT_SUBREG")
401 throw R->getName() + " doesn't have a field named '" +
402 Val->getValue() + "'!";
406 Init *Value = RV->getValue();
407 if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
408 if (BI->getValue()) OS << "|(1<<" << Shift << ")";
410 } else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) {
411 // Convert the Bits to an integer to print...
412 Init *I = BI->convertInitializerTo(new IntRecTy());
414 if (IntInit *II = dynamic_cast<IntInit*>(I)) {
415 if (II->getValue()) {
417 OS << "|(" << II->getValue() << "<<" << Shift << ")";
419 OS << "|" << II->getValue();
424 } else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
425 if (II->getValue()) {
427 OS << "|(" << II->getValue() << "<<" << Shift << ")";
429 OS << II->getValue();
434 std::cerr << "Unhandled initializer: " << *Val << "\n";
435 throw "In record '" + R->getName() + "' for TSFlag emission.";