1 //===- AsmWriterEmitter.cpp - Generate an assembly writer -----------------===//
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 emits an assembly printer for the current target.
11 // Note that this is currently fairly skeletal, but will grow over time.
13 //===----------------------------------------------------------------------===//
15 #include "AsmWriterInst.h"
16 #include "CodeGenTarget.h"
17 #include "SequenceToOffsetTable.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/ADT/Twine.h"
21 #include "llvm/Support/Debug.h"
22 #include "llvm/Support/Format.h"
23 #include "llvm/Support/MathExtras.h"
24 #include "llvm/TableGen/Error.h"
25 #include "llvm/TableGen/Record.h"
26 #include "llvm/TableGen/TableGenBackend.h"
33 #define DEBUG_TYPE "asm-writer-emitter"
36 class AsmWriterEmitter {
37 RecordKeeper &Records;
39 std::map<const CodeGenInstruction*, AsmWriterInst*> CGIAWIMap;
40 const std::vector<const CodeGenInstruction*> *NumberedInstructions;
41 std::vector<AsmWriterInst> Instructions;
42 std::vector<std::string> PrintMethods;
44 AsmWriterEmitter(RecordKeeper &R);
46 void run(raw_ostream &o);
49 void EmitPrintInstruction(raw_ostream &o);
50 void EmitGetRegisterName(raw_ostream &o);
51 void EmitPrintAliasInstruction(raw_ostream &O);
53 AsmWriterInst *getAsmWriterInstByID(unsigned ID) const {
54 assert(ID < NumberedInstructions->size());
55 std::map<const CodeGenInstruction*, AsmWriterInst*>::const_iterator I =
56 CGIAWIMap.find(NumberedInstructions->at(ID));
57 assert(I != CGIAWIMap.end() && "Didn't find inst!");
60 void FindUniqueOperandCommands(std::vector<std::string> &UOC,
61 std::vector<unsigned> &InstIdxs,
62 std::vector<unsigned> &InstOpsUsed) const;
64 } // end anonymous namespace
66 static void PrintCases(std::vector<std::pair<std::string,
67 AsmWriterOperand> > &OpsToPrint, raw_ostream &O) {
68 O << " case " << OpsToPrint.back().first << ": ";
69 AsmWriterOperand TheOp = OpsToPrint.back().second;
70 OpsToPrint.pop_back();
72 // Check to see if any other operands are identical in this list, and if so,
73 // emit a case label for them.
74 for (unsigned i = OpsToPrint.size(); i != 0; --i)
75 if (OpsToPrint[i-1].second == TheOp) {
76 O << "\n case " << OpsToPrint[i-1].first << ": ";
77 OpsToPrint.erase(OpsToPrint.begin()+i-1);
80 // Finally, emit the code.
86 /// EmitInstructions - Emit the last instruction in the vector and any other
87 /// instructions that are suitably similar to it.
88 static void EmitInstructions(std::vector<AsmWriterInst> &Insts,
90 AsmWriterInst FirstInst = Insts.back();
93 std::vector<AsmWriterInst> SimilarInsts;
94 unsigned DifferingOperand = ~0;
95 for (unsigned i = Insts.size(); i != 0; --i) {
96 unsigned DiffOp = Insts[i-1].MatchesAllButOneOp(FirstInst);
98 if (DifferingOperand == ~0U) // First match!
99 DifferingOperand = DiffOp;
101 // If this differs in the same operand as the rest of the instructions in
102 // this class, move it to the SimilarInsts list.
103 if (DifferingOperand == DiffOp || DiffOp == ~0U) {
104 SimilarInsts.push_back(Insts[i-1]);
105 Insts.erase(Insts.begin()+i-1);
110 O << " case " << FirstInst.CGI->Namespace << "::"
111 << FirstInst.CGI->TheDef->getName() << ":\n";
112 for (const AsmWriterInst &AWI : SimilarInsts)
113 O << " case " << AWI.CGI->Namespace << "::"
114 << AWI.CGI->TheDef->getName() << ":\n";
115 for (unsigned i = 0, e = FirstInst.Operands.size(); i != e; ++i) {
116 if (i != DifferingOperand) {
117 // If the operand is the same for all instructions, just print it.
118 O << " " << FirstInst.Operands[i].getCode();
120 // If this is the operand that varies between all of the instructions,
121 // emit a switch for just this operand now.
122 O << " switch (MI->getOpcode()) {\n";
123 std::vector<std::pair<std::string, AsmWriterOperand> > OpsToPrint;
124 OpsToPrint.push_back(std::make_pair(FirstInst.CGI->Namespace + "::" +
125 FirstInst.CGI->TheDef->getName(),
126 FirstInst.Operands[i]));
128 for (const AsmWriterInst &AWI : SimilarInsts) {
129 OpsToPrint.push_back(std::make_pair(AWI.CGI->Namespace+"::"+
130 AWI.CGI->TheDef->getName(),
133 std::reverse(OpsToPrint.begin(), OpsToPrint.end());
134 while (!OpsToPrint.empty())
135 PrintCases(OpsToPrint, O);
143 void AsmWriterEmitter::
144 FindUniqueOperandCommands(std::vector<std::string> &UniqueOperandCommands,
145 std::vector<unsigned> &InstIdxs,
146 std::vector<unsigned> &InstOpsUsed) const {
147 InstIdxs.assign(NumberedInstructions->size(), ~0U);
149 // This vector parallels UniqueOperandCommands, keeping track of which
150 // instructions each case are used for. It is a comma separated string of
152 std::vector<std::string> InstrsForCase;
153 InstrsForCase.resize(UniqueOperandCommands.size());
154 InstOpsUsed.assign(UniqueOperandCommands.size(), 0);
156 for (unsigned i = 0, e = NumberedInstructions->size(); i != e; ++i) {
157 const AsmWriterInst *Inst = getAsmWriterInstByID(i);
159 continue; // PHI, INLINEASM, CFI_INSTRUCTION, etc.
161 if (Inst->Operands.empty())
162 continue; // Instruction already done.
164 std::string Command = " " + Inst->Operands[0].getCode() + "\n";
166 // Check to see if we already have 'Command' in UniqueOperandCommands.
168 bool FoundIt = false;
169 for (unsigned idx = 0, e = UniqueOperandCommands.size(); idx != e; ++idx)
170 if (UniqueOperandCommands[idx] == Command) {
172 InstrsForCase[idx] += ", ";
173 InstrsForCase[idx] += Inst->CGI->TheDef->getName();
178 InstIdxs[i] = UniqueOperandCommands.size();
179 UniqueOperandCommands.push_back(std::move(Command));
180 InstrsForCase.push_back(Inst->CGI->TheDef->getName());
182 // This command matches one operand so far.
183 InstOpsUsed.push_back(1);
187 // For each entry of UniqueOperandCommands, there is a set of instructions
188 // that uses it. If the next command of all instructions in the set are
189 // identical, fold it into the command.
190 for (unsigned CommandIdx = 0, e = UniqueOperandCommands.size();
191 CommandIdx != e; ++CommandIdx) {
193 for (unsigned Op = 1; ; ++Op) {
194 // Scan for the first instruction in the set.
195 std::vector<unsigned>::iterator NIT =
196 std::find(InstIdxs.begin(), InstIdxs.end(), CommandIdx);
197 if (NIT == InstIdxs.end()) break; // No commonality.
199 // If this instruction has no more operands, we isn't anything to merge
200 // into this command.
201 const AsmWriterInst *FirstInst =
202 getAsmWriterInstByID(NIT-InstIdxs.begin());
203 if (!FirstInst || FirstInst->Operands.size() == Op)
206 // Otherwise, scan to see if all of the other instructions in this command
207 // set share the operand.
210 for (NIT = std::find(NIT+1, InstIdxs.end(), CommandIdx);
211 NIT != InstIdxs.end();
212 NIT = std::find(NIT+1, InstIdxs.end(), CommandIdx)) {
213 // Okay, found another instruction in this command set. If the operand
214 // matches, we're ok, otherwise bail out.
215 const AsmWriterInst *OtherInst =
216 getAsmWriterInstByID(NIT-InstIdxs.begin());
218 if (!OtherInst || OtherInst->Operands.size() == Op ||
219 OtherInst->Operands[Op] != FirstInst->Operands[Op]) {
226 // Okay, everything in this command set has the same next operand. Add it
227 // to UniqueOperandCommands and remember that it was consumed.
228 std::string Command = " " + FirstInst->Operands[Op].getCode() + "\n";
230 UniqueOperandCommands[CommandIdx] += Command;
231 InstOpsUsed[CommandIdx]++;
235 // Prepend some of the instructions each case is used for onto the case val.
236 for (unsigned i = 0, e = InstrsForCase.size(); i != e; ++i) {
237 std::string Instrs = InstrsForCase[i];
238 if (Instrs.size() > 70) {
239 Instrs.erase(Instrs.begin()+70, Instrs.end());
244 UniqueOperandCommands[i] = " // " + Instrs + "\n" +
245 UniqueOperandCommands[i];
250 static void UnescapeString(std::string &Str) {
251 for (unsigned i = 0; i != Str.size(); ++i) {
252 if (Str[i] == '\\' && i != Str.size()-1) {
254 default: continue; // Don't execute the code after the switch.
255 case 'a': Str[i] = '\a'; break;
256 case 'b': Str[i] = '\b'; break;
257 case 'e': Str[i] = 27; break;
258 case 'f': Str[i] = '\f'; break;
259 case 'n': Str[i] = '\n'; break;
260 case 'r': Str[i] = '\r'; break;
261 case 't': Str[i] = '\t'; break;
262 case 'v': Str[i] = '\v'; break;
263 case '"': Str[i] = '\"'; break;
264 case '\'': Str[i] = '\''; break;
265 case '\\': Str[i] = '\\'; break;
267 // Nuke the second character.
268 Str.erase(Str.begin()+i+1);
273 /// EmitPrintInstruction - Generate the code for the "printInstruction" method
274 /// implementation. Destroys all instances of AsmWriterInst information, by
275 /// clearing the Instructions vector.
276 void AsmWriterEmitter::EmitPrintInstruction(raw_ostream &O) {
277 Record *AsmWriter = Target.getAsmWriter();
278 std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
279 unsigned PassSubtarget = AsmWriter->getValueAsInt("PassSubtarget");
282 "/// printInstruction - This method is automatically generated by tablegen\n"
283 "/// from the instruction set description.\n"
284 "void " << Target.getName() << ClassName
285 << "::printInstruction(const MCInst *MI, "
286 << (PassSubtarget ? "const MCSubtargetInfo &STI, " : "")
287 << "raw_ostream &O) {\n";
289 // Build an aggregate string, and build a table of offsets into it.
290 SequenceToOffsetTable<std::string> StringTable;
292 /// OpcodeInfo - This encodes the index of the string to use for the first
293 /// chunk of the output as well as indices used for operand printing.
294 /// To reduce the number of unhandled cases, we expand the size from 32-bit
295 /// to 32+16 = 48-bit.
296 std::vector<uint64_t> OpcodeInfo;
298 // Add all strings to the string table upfront so it can generate an optimized
300 for (const CodeGenInstruction *Inst : *NumberedInstructions) {
301 AsmWriterInst *AWI = CGIAWIMap[Inst];
303 AWI->Operands[0].OperandType ==
304 AsmWriterOperand::isLiteralTextOperand &&
305 !AWI->Operands[0].Str.empty()) {
306 std::string Str = AWI->Operands[0].Str;
308 StringTable.add(Str);
312 StringTable.layout();
314 unsigned MaxStringIdx = 0;
315 for (const CodeGenInstruction *Inst : *NumberedInstructions) {
316 AsmWriterInst *AWI = CGIAWIMap[Inst];
319 // Something not handled by the asmwriter printer.
321 } else if (AWI->Operands[0].OperandType !=
322 AsmWriterOperand::isLiteralTextOperand ||
323 AWI->Operands[0].Str.empty()) {
324 // Something handled by the asmwriter printer, but with no leading string.
325 Idx = StringTable.get("");
327 std::string Str = AWI->Operands[0].Str;
329 Idx = StringTable.get(Str);
330 MaxStringIdx = std::max(MaxStringIdx, Idx);
332 // Nuke the string from the operand list. It is now handled!
333 AWI->Operands.erase(AWI->Operands.begin());
336 // Bias offset by one since we want 0 as a sentinel.
337 OpcodeInfo.push_back(Idx+1);
340 // Figure out how many bits we used for the string index.
341 unsigned AsmStrBits = Log2_32_Ceil(MaxStringIdx+2);
343 // To reduce code size, we compactify common instructions into a few bits
344 // in the opcode-indexed table.
345 unsigned BitsLeft = 64-AsmStrBits;
347 std::vector<std::vector<std::string>> TableDrivenOperandPrinters;
350 std::vector<std::string> UniqueOperandCommands;
351 std::vector<unsigned> InstIdxs;
352 std::vector<unsigned> NumInstOpsHandled;
353 FindUniqueOperandCommands(UniqueOperandCommands, InstIdxs,
356 // If we ran out of operands to print, we're done.
357 if (UniqueOperandCommands.empty()) break;
359 // Compute the number of bits we need to represent these cases, this is
360 // ceil(log2(numentries)).
361 unsigned NumBits = Log2_32_Ceil(UniqueOperandCommands.size());
363 // If we don't have enough bits for this operand, don't include it.
364 if (NumBits > BitsLeft) {
365 DEBUG(errs() << "Not enough bits to densely encode " << NumBits
370 // Otherwise, we can include this in the initial lookup table. Add it in.
371 for (unsigned i = 0, e = InstIdxs.size(); i != e; ++i)
372 if (InstIdxs[i] != ~0U) {
373 OpcodeInfo[i] |= (uint64_t)InstIdxs[i] << (64-BitsLeft);
377 // Remove the info about this operand.
378 for (unsigned i = 0, e = NumberedInstructions->size(); i != e; ++i) {
379 if (AsmWriterInst *Inst = getAsmWriterInstByID(i))
380 if (!Inst->Operands.empty()) {
381 unsigned NumOps = NumInstOpsHandled[InstIdxs[i]];
382 assert(NumOps <= Inst->Operands.size() &&
383 "Can't remove this many ops!");
384 Inst->Operands.erase(Inst->Operands.begin(),
385 Inst->Operands.begin()+NumOps);
389 // Remember the handlers for this set of operands.
390 TableDrivenOperandPrinters.push_back(std::move(UniqueOperandCommands));
393 // Emit the string table itself.
394 O << " static const char AsmStrs[] = {\n";
395 StringTable.emit(O, printChar);
398 // Emit the lookup tables in pieces to minimize wasted bytes.
399 unsigned BytesNeeded = ((64 - BitsLeft) + 7) / 8;
400 unsigned Table = 0, Shift = 0;
401 SmallString<128> BitsString;
402 raw_svector_ostream BitsOS(BitsString);
403 // If the total bits is more than 32-bits we need to use a 64-bit type.
404 BitsOS << " uint" << ((BitsLeft < 32) ? 64 : 32) << "_t Bits = 0;\n";
405 while (BytesNeeded != 0) {
406 // Figure out how big this table section needs to be, but no bigger than 4.
407 unsigned TableSize = std::min(1 << Log2_32(BytesNeeded), 4);
408 BytesNeeded -= TableSize;
409 TableSize *= 8; // Convert to bits;
410 uint64_t Mask = (1ULL << TableSize) - 1;
411 O << " static const uint" << TableSize << "_t OpInfo" << Table
413 for (unsigned i = 0, e = NumberedInstructions->size(); i != e; ++i) {
414 O << " " << ((OpcodeInfo[i] >> Shift) & Mask) << "U,\t// "
415 << NumberedInstructions->at(i)->TheDef->getName() << "\n";
418 // Emit string to combine the individual table lookups.
419 BitsOS << " Bits |= ";
420 // If the total bits is more than 32-bits we need to use a 64-bit type.
422 BitsOS << "(uint64_t)";
423 BitsOS << "OpInfo" << Table << "[MI->getOpcode()] << " << Shift << ";\n";
424 // Prepare the shift for the next iteration and increment the table count.
429 // Emit the initial tab character.
430 O << " O << \"\\t\";\n\n";
432 O << " // Emit the opcode for the instruction.\n";
435 // Emit the starting string.
436 O << " assert(Bits != 0 && \"Cannot print this instruction.\");\n"
437 << " O << AsmStrs+(Bits & " << (1 << AsmStrBits)-1 << ")-1;\n\n";
439 // Output the table driven operand information.
440 BitsLeft = 64-AsmStrBits;
441 for (unsigned i = 0, e = TableDrivenOperandPrinters.size(); i != e; ++i) {
442 std::vector<std::string> &Commands = TableDrivenOperandPrinters[i];
444 // Compute the number of bits we need to represent these cases, this is
445 // ceil(log2(numentries)).
446 unsigned NumBits = Log2_32_Ceil(Commands.size());
447 assert(NumBits <= BitsLeft && "consistency error");
449 // Emit code to extract this field from Bits.
450 O << "\n // Fragment " << i << " encoded into " << NumBits
451 << " bits for " << Commands.size() << " unique commands.\n";
453 if (Commands.size() == 2) {
454 // Emit two possibilitys with if/else.
455 O << " if ((Bits >> "
456 << (64-BitsLeft) << ") & "
457 << ((1 << NumBits)-1) << ") {\n"
462 } else if (Commands.size() == 1) {
463 // Emit a single possibility.
464 O << Commands[0] << "\n\n";
466 O << " switch ((Bits >> "
467 << (64-BitsLeft) << ") & "
468 << ((1 << NumBits)-1) << ") {\n"
469 << " default: llvm_unreachable(\"Invalid command number.\");\n";
471 // Print out all the cases.
472 for (unsigned j = 0, e = Commands.size(); j != e; ++j) {
473 O << " case " << j << ":\n";
482 // Okay, delete instructions with no operand info left.
483 for (unsigned i = 0, e = Instructions.size(); i != e; ++i) {
484 // Entire instruction has been emitted?
485 AsmWriterInst &Inst = Instructions[i];
486 if (Inst.Operands.empty()) {
487 Instructions.erase(Instructions.begin()+i);
493 // Because this is a vector, we want to emit from the end. Reverse all of the
494 // elements in the vector.
495 std::reverse(Instructions.begin(), Instructions.end());
498 // Now that we've emitted all of the operand info that fit into 32 bits, emit
499 // information for those instructions that are left. This is a less dense
500 // encoding, but we expect the main 32-bit table to handle the majority of
502 if (!Instructions.empty()) {
503 // Find the opcode # of inline asm.
504 O << " switch (MI->getOpcode()) {\n";
505 while (!Instructions.empty())
506 EmitInstructions(Instructions, O);
515 static const char *getMinimalTypeForRange(uint64_t Range) {
516 assert(Range < 0xFFFFFFFFULL && "Enum too large");
525 emitRegisterNameString(raw_ostream &O, StringRef AltName,
526 const std::deque<CodeGenRegister> &Registers) {
527 SequenceToOffsetTable<std::string> StringTable;
528 SmallVector<std::string, 4> AsmNames(Registers.size());
530 for (const auto &Reg : Registers) {
531 std::string &AsmName = AsmNames[i++];
533 // "NoRegAltName" is special. We don't need to do a lookup for that,
534 // as it's just a reference to the default register name.
535 if (AltName == "" || AltName == "NoRegAltName") {
536 AsmName = Reg.TheDef->getValueAsString("AsmName");
538 AsmName = Reg.getName();
540 // Make sure the register has an alternate name for this index.
541 std::vector<Record*> AltNameList =
542 Reg.TheDef->getValueAsListOfDefs("RegAltNameIndices");
544 for (e = AltNameList.size();
545 Idx < e && (AltNameList[Idx]->getName() != AltName);
548 // If the register has an alternate name for this index, use it.
549 // Otherwise, leave it empty as an error flag.
551 std::vector<std::string> AltNames =
552 Reg.TheDef->getValueAsListOfStrings("AltNames");
553 if (AltNames.size() <= Idx)
554 PrintFatalError(Reg.TheDef->getLoc(),
555 "Register definition missing alt name for '" +
557 AsmName = AltNames[Idx];
560 StringTable.add(AsmName);
563 StringTable.layout();
564 O << " static const char AsmStrs" << AltName << "[] = {\n";
565 StringTable.emit(O, printChar);
568 O << " static const " << getMinimalTypeForRange(StringTable.size()-1)
569 << " RegAsmOffset" << AltName << "[] = {";
570 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
573 O << StringTable.get(AsmNames[i]) << ", ";
579 void AsmWriterEmitter::EmitGetRegisterName(raw_ostream &O) {
580 Record *AsmWriter = Target.getAsmWriter();
581 std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
582 const auto &Registers = Target.getRegBank().getRegisters();
583 std::vector<Record*> AltNameIndices = Target.getRegAltNameIndices();
584 bool hasAltNames = AltNameIndices.size() > 1;
585 std::string Namespace =
586 Registers.front().TheDef->getValueAsString("Namespace");
589 "\n\n/// getRegisterName - This method is automatically generated by tblgen\n"
590 "/// from the register set description. This returns the assembler name\n"
591 "/// for the specified register.\n"
592 "const char *" << Target.getName() << ClassName << "::";
594 O << "\ngetRegisterName(unsigned RegNo, unsigned AltIdx) {\n";
596 O << "getRegisterName(unsigned RegNo) {\n";
597 O << " assert(RegNo && RegNo < " << (Registers.size()+1)
598 << " && \"Invalid register number!\");\n"
602 for (const Record *R : AltNameIndices)
603 emitRegisterNameString(O, R->getName(), Registers);
605 emitRegisterNameString(O, "", Registers);
608 O << " switch(AltIdx) {\n"
609 << " default: llvm_unreachable(\"Invalid register alt name index!\");\n";
610 for (const Record *R : AltNameIndices) {
611 std::string AltName(R->getName());
612 std::string Prefix = !Namespace.empty() ? Namespace + "::" : "";
613 O << " case " << Prefix << AltName << ":\n"
614 << " assert(*(AsmStrs" << AltName << "+RegAsmOffset"
615 << AltName << "[RegNo-1]) &&\n"
616 << " \"Invalid alt name index for register!\");\n"
617 << " return AsmStrs" << AltName << "+RegAsmOffset"
618 << AltName << "[RegNo-1];\n";
622 O << " assert (*(AsmStrs+RegAsmOffset[RegNo-1]) &&\n"
623 << " \"Invalid alt name index for register!\");\n"
624 << " return AsmStrs+RegAsmOffset[RegNo-1];\n";
630 // IAPrinter - Holds information about an InstAlias. Two InstAliases match if
631 // they both have the same conditionals. In which case, we cannot print out the
632 // alias for that pattern.
634 std::vector<std::string> Conds;
635 std::map<StringRef, std::pair<int, int>> OpMap;
636 SmallVector<Record*, 4> ReqFeatures;
639 std::string AsmString;
641 IAPrinter(std::string R, std::string AS) : Result(R), AsmString(AS) {}
643 void addCond(const std::string &C) { Conds.push_back(C); }
645 void addOperand(StringRef Op, int OpIdx, int PrintMethodIdx = -1) {
646 assert(OpIdx >= 0 && OpIdx < 0xFE && "Idx out of range");
647 assert(PrintMethodIdx >= -1 && PrintMethodIdx < 0xFF &&
649 OpMap[Op] = std::make_pair(OpIdx, PrintMethodIdx);
652 bool isOpMapped(StringRef Op) { return OpMap.find(Op) != OpMap.end(); }
653 int getOpIndex(StringRef Op) { return OpMap[Op].first; }
654 std::pair<int, int> &getOpData(StringRef Op) { return OpMap[Op]; }
656 std::pair<StringRef, StringRef::iterator> parseName(StringRef::iterator Start,
657 StringRef::iterator End) {
658 StringRef::iterator I = Start;
659 StringRef::iterator Next;
663 while (I != End && *I != '}')
670 // $name, just eat the usual suspects.
672 ((*I >= 'a' && *I <= 'z') || (*I >= 'A' && *I <= 'Z') ||
673 (*I >= '0' && *I <= '9') || *I == '_'))
678 return std::make_pair(StringRef(Start, I - Start), Next);
681 void print(raw_ostream &O) {
682 if (Conds.empty() && ReqFeatures.empty()) {
683 O.indent(6) << "return true;\n";
689 for (std::vector<std::string>::iterator
690 I = Conds.begin(), E = Conds.end(); I != E; ++I) {
691 if (I != Conds.begin()) {
700 O.indent(6) << "// " << Result << "\n";
702 // Directly mangle mapped operands into the string. Each operand is
703 // identified by a '$' sign followed by a byte identifying the number of the
704 // operand. We add one to the index to avoid zero bytes.
705 StringRef ASM(AsmString);
706 SmallString<128> OutString;
707 raw_svector_ostream OS(OutString);
708 for (StringRef::iterator I = ASM.begin(), E = ASM.end(); I != E;) {
712 std::tie(Name, I) = parseName(++I, E);
713 assert(isOpMapped(Name) && "Unmapped operand!");
715 int OpIndex, PrintIndex;
716 std::tie(OpIndex, PrintIndex) = getOpData(Name);
717 if (PrintIndex == -1) {
718 // Can use the default printOperand route.
719 OS << format("\\x%02X", (unsigned char)OpIndex + 1);
721 // 3 bytes if a PrintMethod is needed: 0xFF, the MCInst operand
722 // number, and which of our pre-detected Methods to call.
723 OS << format("\\xFF\\x%02X\\x%02X", OpIndex + 1, PrintIndex + 1);
730 O.indent(6) << "AsmString = \"" << OutString << "\";\n";
732 O.indent(6) << "break;\n";
736 bool operator==(const IAPrinter &RHS) const {
737 if (Conds.size() != RHS.Conds.size())
741 for (const auto &str : Conds)
742 if (str != RHS.Conds[Idx++])
749 } // end anonymous namespace
751 static unsigned CountNumOperands(StringRef AsmString, unsigned Variant) {
752 std::string FlatAsmString =
753 CodeGenInstruction::FlattenAsmStringVariants(AsmString, Variant);
754 AsmString = FlatAsmString;
756 return AsmString.count(' ') + AsmString.count('\t');
760 struct AliasPriorityComparator {
761 typedef std::pair<CodeGenInstAlias, int> ValueType;
762 bool operator()(const ValueType &LHS, const ValueType &RHS) {
763 if (LHS.second == RHS.second) {
764 // We don't actually care about the order, but for consistency it
765 // shouldn't depend on pointer comparisons.
766 return LHS.first.TheDef->getName() < RHS.first.TheDef->getName();
769 // Aliases with larger priorities should be considered first.
770 return LHS.second > RHS.second;
776 void AsmWriterEmitter::EmitPrintAliasInstruction(raw_ostream &O) {
777 Record *AsmWriter = Target.getAsmWriter();
779 O << "\n#ifdef PRINT_ALIAS_INSTR\n";
780 O << "#undef PRINT_ALIAS_INSTR\n\n";
782 //////////////////////////////
783 // Gather information about aliases we need to print
784 //////////////////////////////
786 // Emit the method that prints the alias instruction.
787 std::string ClassName = AsmWriter->getValueAsString("AsmWriterClassName");
788 unsigned Variant = AsmWriter->getValueAsInt("Variant");
789 unsigned PassSubtarget = AsmWriter->getValueAsInt("PassSubtarget");
791 std::vector<Record*> AllInstAliases =
792 Records.getAllDerivedDefinitions("InstAlias");
794 // Create a map from the qualified name to a list of potential matches.
795 typedef std::set<std::pair<CodeGenInstAlias, int>, AliasPriorityComparator>
797 std::map<std::string, AliasWithPriority> AliasMap;
798 for (Record *R : AllInstAliases) {
799 int Priority = R->getValueAsInt("EmitPriority");
801 continue; // Aliases with priority 0 are never emitted.
803 const DagInit *DI = R->getValueAsDag("ResultInst");
804 const DefInit *Op = cast<DefInit>(DI->getOperator());
805 AliasMap[getQualifiedName(Op->getDef())].insert(
806 std::make_pair(CodeGenInstAlias(R, Variant, Target), Priority));
809 // A map of which conditions need to be met for each instruction operand
810 // before it can be matched to the mnemonic.
811 std::map<std::string, std::vector<IAPrinter>> IAPrinterMap;
813 // A list of MCOperandPredicates for all operands in use, and the reverse map
814 std::vector<const Record*> MCOpPredicates;
815 DenseMap<const Record*, unsigned> MCOpPredicateMap;
817 for (auto &Aliases : AliasMap) {
818 for (auto &Alias : Aliases.second) {
819 const CodeGenInstAlias &CGA = Alias.first;
820 unsigned LastOpNo = CGA.ResultInstOperandIndex.size();
821 unsigned NumResultOps =
822 CountNumOperands(CGA.ResultInst->AsmString, Variant);
824 // Don't emit the alias if it has more operands than what it's aliasing.
825 if (NumResultOps < CountNumOperands(CGA.AsmString, Variant))
828 IAPrinter IAP(CGA.Result->getAsString(), CGA.AsmString);
830 unsigned NumMIOps = 0;
831 for (auto &Operand : CGA.ResultOperands)
832 NumMIOps += Operand.getMINumOperands();
835 Cond = std::string("MI->getNumOperands() == ") + llvm::utostr(NumMIOps);
838 bool CantHandle = false;
840 unsigned MIOpNum = 0;
841 for (unsigned i = 0, e = LastOpNo; i != e; ++i) {
842 std::string Op = "MI->getOperand(" + llvm::utostr(MIOpNum) + ")";
844 const CodeGenInstAlias::ResultOperand &RO = CGA.ResultOperands[i];
847 case CodeGenInstAlias::ResultOperand::K_Record: {
848 const Record *Rec = RO.getRecord();
849 StringRef ROName = RO.getName();
850 int PrintMethodIdx = -1;
852 // These two may have a PrintMethod, which we want to record (if it's
853 // the first time we've seen it) and provide an index for the aliasing
855 if (Rec->isSubClassOf("RegisterOperand") ||
856 Rec->isSubClassOf("Operand")) {
857 std::string PrintMethod = Rec->getValueAsString("PrintMethod");
858 if (PrintMethod != "" && PrintMethod != "printOperand") {
859 PrintMethodIdx = std::find(PrintMethods.begin(),
860 PrintMethods.end(), PrintMethod) -
861 PrintMethods.begin();
862 if (static_cast<unsigned>(PrintMethodIdx) == PrintMethods.size())
863 PrintMethods.push_back(PrintMethod);
867 if (Rec->isSubClassOf("RegisterOperand"))
868 Rec = Rec->getValueAsDef("RegClass");
869 if (Rec->isSubClassOf("RegisterClass")) {
870 IAP.addCond(Op + ".isReg()");
872 if (!IAP.isOpMapped(ROName)) {
873 IAP.addOperand(ROName, MIOpNum, PrintMethodIdx);
874 Record *R = CGA.ResultOperands[i].getRecord();
875 if (R->isSubClassOf("RegisterOperand"))
876 R = R->getValueAsDef("RegClass");
877 Cond = std::string("MRI.getRegClass(") + Target.getName() + "::" +
878 R->getName() + "RegClassID)"
879 ".contains(" + Op + ".getReg())";
881 Cond = Op + ".getReg() == MI->getOperand(" +
882 llvm::utostr(IAP.getOpIndex(ROName)) + ").getReg()";
885 // Assume all printable operands are desired for now. This can be
886 // overridden in the InstAlias instantiation if necessary.
887 IAP.addOperand(ROName, MIOpNum, PrintMethodIdx);
889 // There might be an additional predicate on the MCOperand
890 unsigned Entry = MCOpPredicateMap[Rec];
892 if (!Rec->isValueUnset("MCOperandPredicate")) {
893 MCOpPredicates.push_back(Rec);
894 Entry = MCOpPredicates.size();
895 MCOpPredicateMap[Rec] = Entry;
897 break; // No conditions on this operand at all
899 Cond = Target.getName() + ClassName + "ValidateMCOperand(" +
900 Op + ", STI, " + llvm::utostr(Entry) + ")";
902 // for all subcases of ResultOperand::K_Record:
906 case CodeGenInstAlias::ResultOperand::K_Imm: {
907 // Just because the alias has an immediate result, doesn't mean the
908 // MCInst will. An MCExpr could be present, for example.
909 IAP.addCond(Op + ".isImm()");
911 Cond = Op + ".getImm() == " +
912 llvm::utostr(CGA.ResultOperands[i].getImm());
916 case CodeGenInstAlias::ResultOperand::K_Reg:
917 // If this is zero_reg, something's playing tricks we're not
918 // equipped to handle.
919 if (!CGA.ResultOperands[i].getRegister()) {
924 Cond = Op + ".getReg() == " + Target.getName() + "::" +
925 CGA.ResultOperands[i].getRegister()->getName();
930 MIOpNum += RO.getMINumOperands();
933 if (CantHandle) continue;
934 IAPrinterMap[Aliases.first].push_back(std::move(IAP));
938 //////////////////////////////
939 // Write out the printAliasInstr function
940 //////////////////////////////
943 raw_string_ostream HeaderO(Header);
945 HeaderO << "bool " << Target.getName() << ClassName
946 << "::printAliasInstr(const MCInst"
947 << " *MI, " << (PassSubtarget ? "const MCSubtargetInfo &STI, " : "")
948 << "raw_ostream &OS) {\n";
951 raw_string_ostream CasesO(Cases);
953 for (auto &Entry : IAPrinterMap) {
954 std::vector<IAPrinter> &IAPs = Entry.second;
955 std::vector<IAPrinter*> UniqueIAPs;
957 for (auto &LHS : IAPs) {
959 for (const auto &RHS : IAPs) {
960 if (&LHS != &RHS && LHS == RHS) {
967 UniqueIAPs.push_back(&LHS);
970 if (UniqueIAPs.empty()) continue;
972 CasesO.indent(2) << "case " << Entry.first << ":\n";
974 for (IAPrinter *IAP : UniqueIAPs) {
980 CasesO.indent(4) << "return false;\n";
983 if (CasesO.str().empty()) {
985 O << " return false;\n";
987 O << "#endif // PRINT_ALIAS_INSTR\n";
991 if (!MCOpPredicates.empty())
992 O << "static bool " << Target.getName() << ClassName
993 << "ValidateMCOperand(const MCOperand &MCOp,\n"
994 << " const MCSubtargetInfo &STI,\n"
995 << " unsigned PredicateIndex);\n";
998 O.indent(2) << "const char *AsmString;\n";
999 O.indent(2) << "switch (MI->getOpcode()) {\n";
1000 O.indent(2) << "default: return false;\n";
1002 O.indent(2) << "}\n\n";
1004 // Code that prints the alias, replacing the operands with the ones from the
1006 O << " unsigned I = 0;\n";
1007 O << " while (AsmString[I] != ' ' && AsmString[I] != '\t' &&\n";
1008 O << " AsmString[I] != '\\0')\n";
1010 O << " OS << '\\t' << StringRef(AsmString, I);\n";
1012 O << " if (AsmString[I] != '\\0') {\n";
1013 O << " OS << '\\t';\n";
1015 O << " if (AsmString[I] == '$') {\n";
1017 O << " if (AsmString[I] == (char)0xff) {\n";
1019 O << " int OpIdx = AsmString[I++] - 1;\n";
1020 O << " int PrintMethodIdx = AsmString[I++] - 1;\n";
1021 O << " printCustomAliasOperand(MI, OpIdx, PrintMethodIdx, ";
1022 O << (PassSubtarget ? "STI, " : "");
1025 O << " printOperand(MI, unsigned(AsmString[I++]) - 1, ";
1026 O << (PassSubtarget ? "STI, " : "");
1029 O << " OS << AsmString[I++];\n";
1031 O << " } while (AsmString[I] != '\\0');\n";
1034 O << " return true;\n";
1037 //////////////////////////////
1038 // Write out the printCustomAliasOperand function
1039 //////////////////////////////
1041 O << "void " << Target.getName() << ClassName << "::"
1042 << "printCustomAliasOperand(\n"
1043 << " const MCInst *MI, unsigned OpIdx,\n"
1044 << " unsigned PrintMethodIdx,\n"
1045 << (PassSubtarget ? " const MCSubtargetInfo &STI,\n" : "")
1046 << " raw_ostream &OS) {\n";
1047 if (PrintMethods.empty())
1048 O << " llvm_unreachable(\"Unknown PrintMethod kind\");\n";
1050 O << " switch (PrintMethodIdx) {\n"
1052 << " llvm_unreachable(\"Unknown PrintMethod kind\");\n"
1055 for (unsigned i = 0; i < PrintMethods.size(); ++i) {
1056 O << " case " << i << ":\n"
1057 << " " << PrintMethods[i] << "(MI, OpIdx, "
1058 << (PassSubtarget ? "STI, " : "") << "OS);\n"
1065 if (!MCOpPredicates.empty()) {
1066 O << "static bool " << Target.getName() << ClassName
1067 << "ValidateMCOperand(const MCOperand &MCOp,\n"
1068 << " const MCSubtargetInfo &STI,\n"
1069 << " unsigned PredicateIndex) {\n"
1070 << " switch (PredicateIndex) {\n"
1072 << " llvm_unreachable(\"Unknown MCOperandPredicate kind\");\n"
1075 for (unsigned i = 0; i < MCOpPredicates.size(); ++i) {
1076 Init *MCOpPred = MCOpPredicates[i]->getValueInit("MCOperandPredicate");
1077 if (StringInit *SI = dyn_cast<StringInit>(MCOpPred)) {
1078 O << " case " << i + 1 << ": {\n"
1079 << SI->getValue() << "\n"
1082 llvm_unreachable("Unexpected MCOperandPredicate field!");
1088 O << "#endif // PRINT_ALIAS_INSTR\n";
1091 AsmWriterEmitter::AsmWriterEmitter(RecordKeeper &R) : Records(R), Target(R) {
1092 Record *AsmWriter = Target.getAsmWriter();
1093 unsigned Variant = AsmWriter->getValueAsInt("Variant");
1094 unsigned PassSubtarget = AsmWriter->getValueAsInt("PassSubtarget");
1095 for (const CodeGenInstruction *I : Target.instructions())
1096 if (!I->AsmString.empty() && I->TheDef->getName() != "PHI")
1097 Instructions.emplace_back(*I, Variant, PassSubtarget);
1099 // Get the instruction numbering.
1100 NumberedInstructions = &Target.getInstructionsByEnumValue();
1102 // Compute the CodeGenInstruction -> AsmWriterInst mapping. Note that not
1103 // all machine instructions are necessarily being printed, so there may be
1104 // target instructions not in this map.
1105 for (AsmWriterInst &AWI : Instructions)
1106 CGIAWIMap.insert(std::make_pair(AWI.CGI, &AWI));
1109 void AsmWriterEmitter::run(raw_ostream &O) {
1110 EmitPrintInstruction(O);
1111 EmitGetRegisterName(O);
1112 EmitPrintAliasInstruction(O);
1118 void EmitAsmWriter(RecordKeeper &RK, raw_ostream &OS) {
1119 emitSourceFileHeader("Assembly Writer Source Fragment", OS);
1120 AsmWriterEmitter(RK).run(OS);
1123 } // End llvm namespace