1 //===-- ARMAsmParser.cpp - Parse ARM assembly to MCInst instructions ------===//
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 //===----------------------------------------------------------------------===//
11 #include "ARMAddressingModes.h"
12 #include "ARMSubtarget.h"
13 #include "llvm/MC/MCParser/MCAsmLexer.h"
14 #include "llvm/MC/MCParser/MCAsmParser.h"
15 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCStreamer.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/Target/TargetRegistry.h"
21 #include "llvm/Target/TargetAsmParser.h"
22 #include "llvm/Support/SourceMgr.h"
23 #include "llvm/Support/raw_ostream.h"
24 #include "llvm/ADT/SmallVector.h"
25 #include "llvm/ADT/StringSwitch.h"
26 #include "llvm/ADT/Twine.h"
29 // The shift types for register controlled shifts in arm memory addressing
42 class ARMAsmParser : public TargetAsmParser {
46 MCAsmParser &getParser() const { return Parser; }
47 MCAsmLexer &getLexer() const { return Parser.getLexer(); }
49 void Warning(SMLoc L, const Twine &Msg) { Parser.Warning(L, Msg); }
50 bool Error(SMLoc L, const Twine &Msg) { return Parser.Error(L, Msg); }
52 int TryParseRegister();
53 ARMOperand *TryParseRegisterWithWriteBack();
54 ARMOperand *ParseRegisterList();
55 ARMOperand *ParseMemory();
56 ARMOperand *ParseOperand();
58 bool ParseMemoryOffsetReg(bool &Negative,
59 bool &OffsetRegShifted,
60 enum ShiftType &ShiftType,
61 const MCExpr *&ShiftAmount,
62 const MCExpr *&Offset,
66 bool ParseShift(enum ShiftType &St, const MCExpr *&ShiftAmount, SMLoc &E);
67 bool ParseDirectiveWord(unsigned Size, SMLoc L);
68 bool ParseDirectiveThumb(SMLoc L);
69 bool ParseDirectiveThumbFunc(SMLoc L);
70 bool ParseDirectiveCode(SMLoc L);
71 bool ParseDirectiveSyntax(SMLoc L);
73 bool MatchAndEmitInstruction(SMLoc IDLoc,
74 SmallVectorImpl<MCParsedAsmOperand*> &Operands,
77 /// @name Auto-generated Match Functions
80 #define GET_ASSEMBLER_HEADER
81 #include "ARMGenAsmMatcher.inc"
86 ARMAsmParser(const Target &T, MCAsmParser &_Parser, TargetMachine &_TM)
87 : TargetAsmParser(T), Parser(_Parser), TM(_TM) {
88 // Initialize the set of available features.
89 setAvailableFeatures(ComputeAvailableFeatures(
90 &TM.getSubtarget<ARMSubtarget>()));
93 virtual bool ParseInstruction(StringRef Name, SMLoc NameLoc,
94 SmallVectorImpl<MCParsedAsmOperand*> &Operands);
95 virtual bool ParseDirective(AsmToken DirectiveID);
97 } // end anonymous namespace
101 /// ARMOperand - Instances of this class represent a parsed ARM machine
103 class ARMOperand : public MCParsedAsmOperand {
115 SMLoc StartLoc, EndLoc;
119 ARMCC::CondCodes Val;
133 SmallVector<unsigned, 32> *Registers;
140 // This is for all forms of ARM address expressions
143 unsigned OffsetRegNum; // used when OffsetIsReg is true
144 const MCExpr *Offset; // used when OffsetIsReg is false
145 const MCExpr *ShiftAmount; // used when OffsetRegShifted is true
146 enum ShiftType ShiftType; // used when OffsetRegShifted is true
147 unsigned OffsetRegShifted : 1; // only used when OffsetIsReg is true
148 unsigned Preindexed : 1;
149 unsigned Postindexed : 1;
150 unsigned OffsetIsReg : 1;
151 unsigned Negative : 1; // only used when OffsetIsReg is true
152 unsigned Writeback : 1;
156 ARMOperand(KindTy K) : MCParsedAsmOperand(), Kind(K) {}
158 ARMOperand(const ARMOperand &o) : MCParsedAsmOperand() {
160 StartLoc = o.StartLoc;
173 case DPRRegisterList:
174 case SPRRegisterList:
187 delete RegList.Registers;
190 /// getStartLoc - Get the location of the first token of this operand.
191 SMLoc getStartLoc() const { return StartLoc; }
192 /// getEndLoc - Get the location of the last token of this operand.
193 SMLoc getEndLoc() const { return EndLoc; }
195 ARMCC::CondCodes getCondCode() const {
196 assert(Kind == CondCode && "Invalid access!");
200 StringRef getToken() const {
201 assert(Kind == Token && "Invalid access!");
202 return StringRef(Tok.Data, Tok.Length);
205 unsigned getReg() const {
206 assert(Kind == Register && "Invalid access!");
210 const SmallVectorImpl<unsigned> &getRegList() const {
211 assert((Kind == RegisterList || Kind == DPRRegisterList ||
212 Kind == SPRRegisterList) && "Invalid access!");
213 return *RegList.Registers;
216 const MCExpr *getImm() const {
217 assert(Kind == Immediate && "Invalid access!");
221 bool isCondCode() const { return Kind == CondCode; }
222 bool isImm() const { return Kind == Immediate; }
223 bool isReg() const { return Kind == Register; }
224 bool isRegList() const { return Kind == RegisterList; }
225 bool isDPRRegList() const { return Kind == DPRRegisterList; }
226 bool isSPRRegList() const { return Kind == SPRRegisterList; }
227 bool isToken() const { return Kind == Token; }
228 bool isMemory() const { return Kind == Memory; }
229 bool isMemMode5() const {
230 if (!isMemory() || Mem.OffsetIsReg || Mem.OffsetRegShifted ||
231 Mem.Writeback || Mem.Negative)
233 // If there is an offset expression, make sure it's valid.
236 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
239 // The offset must be a multiple of 4 in the range 0-1020.
240 int64_t Value = CE->getValue();
241 return ((Value & 0x3) == 0 && Value <= 1020 && Value >= -1020);
244 void addExpr(MCInst &Inst, const MCExpr *Expr) const {
245 // Add as immediates when possible. Null MCExpr = 0.
247 Inst.addOperand(MCOperand::CreateImm(0));
248 else if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
249 Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
251 Inst.addOperand(MCOperand::CreateExpr(Expr));
254 void addCondCodeOperands(MCInst &Inst, unsigned N) const {
255 assert(N == 2 && "Invalid number of operands!");
256 Inst.addOperand(MCOperand::CreateImm(unsigned(getCondCode())));
257 // FIXME: What belongs here?
258 Inst.addOperand(MCOperand::CreateReg(0));
261 void addRegOperands(MCInst &Inst, unsigned N) const {
262 assert(N == 1 && "Invalid number of operands!");
263 Inst.addOperand(MCOperand::CreateReg(getReg()));
266 void addRegListOperands(MCInst &Inst, unsigned N) const {
267 assert(N == 1 && "Invalid number of operands!");
268 const SmallVectorImpl<unsigned> &RegList = getRegList();
269 for (SmallVectorImpl<unsigned>::const_iterator
270 I = RegList.begin(), E = RegList.end(); I != E; ++I)
271 Inst.addOperand(MCOperand::CreateReg(*I));
274 void addDPRRegListOperands(MCInst &Inst, unsigned N) const {
275 addRegListOperands(Inst, N);
278 void addSPRRegListOperands(MCInst &Inst, unsigned N) const {
279 addRegListOperands(Inst, N);
282 void addImmOperands(MCInst &Inst, unsigned N) const {
283 assert(N == 1 && "Invalid number of operands!");
284 addExpr(Inst, getImm());
287 void addMemMode5Operands(MCInst &Inst, unsigned N) const {
288 assert(N == 2 && isMemMode5() && "Invalid number of operands!");
290 Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
291 assert(!Mem.OffsetIsReg && "Invalid mode 5 operand");
293 // FIXME: #-0 is encoded differently than #0. Does the parser preserve
296 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
297 assert(CE && "Non-constant mode 5 offset operand!");
299 // The MCInst offset operand doesn't include the low two bits (like
300 // the instruction encoding).
301 int64_t Offset = CE->getValue() / 4;
303 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add,
306 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub,
309 Inst.addOperand(MCOperand::CreateImm(0));
313 virtual void dump(raw_ostream &OS) const;
315 static ARMOperand *CreateCondCode(ARMCC::CondCodes CC, SMLoc S) {
316 ARMOperand *Op = new ARMOperand(CondCode);
323 static ARMOperand *CreateToken(StringRef Str, SMLoc S) {
324 ARMOperand *Op = new ARMOperand(Token);
325 Op->Tok.Data = Str.data();
326 Op->Tok.Length = Str.size();
332 static ARMOperand *CreateReg(unsigned RegNum, bool Writeback, SMLoc S,
334 ARMOperand *Op = new ARMOperand(Register);
335 Op->Reg.RegNum = RegNum;
336 Op->Reg.Writeback = Writeback;
343 CreateRegList(const SmallVectorImpl<std::pair<unsigned, SMLoc> > &Regs,
344 SMLoc StartLoc, SMLoc EndLoc) {
345 KindTy Kind = RegisterList;
347 if (ARM::DPRRegClass.contains(Regs.front().first))
348 Kind = DPRRegisterList;
349 else if (ARM::SPRRegClass.contains(Regs.front().first))
350 Kind = SPRRegisterList;
352 ARMOperand *Op = new ARMOperand(Kind);
353 Op->RegList.Registers = new SmallVector<unsigned, 32>();
354 for (SmallVectorImpl<std::pair<unsigned, SMLoc> >::const_iterator
355 I = Regs.begin(), E = Regs.end(); I != E; ++I)
356 Op->RegList.Registers->push_back(I->first);
357 std::sort(Op->RegList.Registers->begin(), Op->RegList.Registers->end());
358 Op->StartLoc = StartLoc;
363 static ARMOperand *CreateImm(const MCExpr *Val, SMLoc S, SMLoc E) {
364 ARMOperand *Op = new ARMOperand(Immediate);
371 static ARMOperand *CreateMem(unsigned BaseRegNum, bool OffsetIsReg,
372 const MCExpr *Offset, unsigned OffsetRegNum,
373 bool OffsetRegShifted, enum ShiftType ShiftType,
374 const MCExpr *ShiftAmount, bool Preindexed,
375 bool Postindexed, bool Negative, bool Writeback,
377 ARMOperand *Op = new ARMOperand(Memory);
378 Op->Mem.BaseRegNum = BaseRegNum;
379 Op->Mem.OffsetIsReg = OffsetIsReg;
380 Op->Mem.Offset = Offset;
381 Op->Mem.OffsetRegNum = OffsetRegNum;
382 Op->Mem.OffsetRegShifted = OffsetRegShifted;
383 Op->Mem.ShiftType = ShiftType;
384 Op->Mem.ShiftAmount = ShiftAmount;
385 Op->Mem.Preindexed = Preindexed;
386 Op->Mem.Postindexed = Postindexed;
387 Op->Mem.Negative = Negative;
388 Op->Mem.Writeback = Writeback;
396 } // end anonymous namespace.
398 void ARMOperand::dump(raw_ostream &OS) const {
401 OS << ARMCondCodeToString(getCondCode());
407 OS << "<memory" << (!Mem.Writeback ? ">" : "!>");
410 OS << "<register " << getReg() << (!Reg.Writeback ? ">" : "!>");
413 case DPRRegisterList:
414 case SPRRegisterList: {
415 OS << "<register_list ";
417 const SmallVectorImpl<unsigned> &RegList = getRegList();
418 for (SmallVectorImpl<unsigned>::const_iterator
419 I = RegList.begin(), E = RegList.end(); I != E; ) {
421 if (++I < E) OS << ", ";
428 OS << "'" << getToken() << "'";
433 /// @name Auto-generated Match Functions
436 static unsigned MatchRegisterName(StringRef Name);
440 /// Try to parse a register name. The token must be an Identifier when called,
441 /// and if it is a register name the token is eaten and the register number is
442 /// returned. Otherwise return -1.
444 int ARMAsmParser::TryParseRegister() {
445 const AsmToken &Tok = Parser.getTok();
446 assert(Tok.is(AsmToken::Identifier) && "Token is not an Identifier");
448 // FIXME: Validate register for the current architecture; we have to do
449 // validation later, so maybe there is no need for this here.
450 unsigned RegNum = MatchRegisterName(Tok.getString());
453 Parser.Lex(); // Eat identifier token.
458 /// Try to parse a register name. The token must be an Identifier when called,
459 /// and if it is a register name the token is eaten and the register number is
460 /// returned. Otherwise return -1.
462 /// TODO this is likely to change to allow different register types and or to
463 /// parse for a specific register type.
464 ARMOperand *ARMAsmParser::TryParseRegisterWithWriteBack() {
465 SMLoc S = Parser.getTok().getLoc();
466 int RegNo = TryParseRegister();
470 SMLoc E = Parser.getTok().getLoc();
472 bool Writeback = false;
473 const AsmToken &ExclaimTok = Parser.getTok();
474 if (ExclaimTok.is(AsmToken::Exclaim)) {
475 E = ExclaimTok.getLoc();
477 Parser.Lex(); // Eat exclaim token
480 return ARMOperand::CreateReg(RegNo, Writeback, S, E);
483 /// Parse a register list, return it if successful else return null. The first
484 /// token must be a '{' when called.
485 ARMOperand *ARMAsmParser::ParseRegisterList() {
486 assert(Parser.getTok().is(AsmToken::LCurly) &&
487 "Token is not a Left Curly Brace");
488 SMLoc S = Parser.getTok().getLoc();
490 // Read the rest of the registers in the list.
491 unsigned PrevRegNum = 0;
492 SmallVector<std::pair<unsigned, SMLoc>, 32> Registers;
495 bool IsRange = Parser.getTok().is(AsmToken::Minus);
496 Parser.Lex(); // Eat non-identifier token.
498 const AsmToken &RegTok = Parser.getTok();
499 SMLoc RegLoc = RegTok.getLoc();
500 if (RegTok.isNot(AsmToken::Identifier)) {
501 Error(RegLoc, "register expected");
505 int RegNum = TryParseRegister();
507 Error(RegLoc, "register expected");
512 int Reg = PrevRegNum;
515 Registers.push_back(std::make_pair(Reg, RegLoc));
516 } while (Reg != RegNum);
518 Registers.push_back(std::make_pair(RegNum, RegLoc));
522 } while (Parser.getTok().is(AsmToken::Comma) ||
523 Parser.getTok().is(AsmToken::Minus));
525 // Process the right curly brace of the list.
526 const AsmToken &RCurlyTok = Parser.getTok();
527 if (RCurlyTok.isNot(AsmToken::RCurly)) {
528 Error(RCurlyTok.getLoc(), "'}' expected");
532 SMLoc E = RCurlyTok.getLoc();
533 Parser.Lex(); // Eat right curly brace token.
535 // Verify the register list.
536 SmallVectorImpl<std::pair<unsigned, SMLoc> >::const_iterator
537 RI = Registers.begin(), RE = Registers.end();
539 DenseMap<unsigned, bool> RegMap;
540 RegMap[RI->first] = true;
542 unsigned HighRegNum = RI->first;
543 bool EmittedWarning = false;
545 for (++RI; RI != RE; ++RI) {
546 const std::pair<unsigned, SMLoc> &RegInfo = *RI;
547 unsigned Reg = RegInfo.first;
550 Error(RegInfo.second, "register duplicated in register list");
554 if (!EmittedWarning && Reg < HighRegNum)
555 Warning(RegInfo.second,
556 "register not in ascending order in register list");
559 HighRegNum = std::max(Reg, HighRegNum);
562 return ARMOperand::CreateRegList(Registers, S, E);
565 /// Parse an ARM memory expression, return false if successful else return true
566 /// or an error. The first token must be a '[' when called.
567 /// TODO Only preindexing and postindexing addressing are started, unindexed
568 /// with option, etc are still to do.
569 ARMOperand *ARMAsmParser::ParseMemory() {
571 assert(Parser.getTok().is(AsmToken::LBrac) &&
572 "Token is not a Left Bracket");
573 S = Parser.getTok().getLoc();
574 Parser.Lex(); // Eat left bracket token.
576 const AsmToken &BaseRegTok = Parser.getTok();
577 if (BaseRegTok.isNot(AsmToken::Identifier)) {
578 Error(BaseRegTok.getLoc(), "register expected");
581 int BaseRegNum = TryParseRegister();
582 if (BaseRegNum == -1) {
583 Error(BaseRegTok.getLoc(), "register expected");
587 bool Preindexed = false;
588 bool Postindexed = false;
589 bool OffsetIsReg = false;
590 bool Negative = false;
591 bool Writeback = false;
593 // First look for preindexed address forms, that is after the "[Rn" we now
594 // have to see if the next token is a comma.
595 const AsmToken &Tok = Parser.getTok();
596 if (Tok.is(AsmToken::Comma)) {
598 Parser.Lex(); // Eat comma token.
600 bool OffsetRegShifted;
601 enum ShiftType ShiftType;
602 const MCExpr *ShiftAmount;
603 const MCExpr *Offset;
604 if (ParseMemoryOffsetReg(Negative, OffsetRegShifted, ShiftType, ShiftAmount,
605 Offset, OffsetIsReg, OffsetRegNum, E))
607 const AsmToken &RBracTok = Parser.getTok();
608 if (RBracTok.isNot(AsmToken::RBrac)) {
609 Error(RBracTok.getLoc(), "']' expected");
612 E = RBracTok.getLoc();
613 Parser.Lex(); // Eat right bracket token.
615 const AsmToken &ExclaimTok = Parser.getTok();
616 if (ExclaimTok.is(AsmToken::Exclaim)) {
617 E = ExclaimTok.getLoc();
619 Parser.Lex(); // Eat exclaim token
621 return ARMOperand::CreateMem(BaseRegNum, OffsetIsReg, Offset, OffsetRegNum,
622 OffsetRegShifted, ShiftType, ShiftAmount,
623 Preindexed, Postindexed, Negative, Writeback,
626 // The "[Rn" we have so far was not followed by a comma.
627 else if (Tok.is(AsmToken::RBrac)) {
628 // If there's anything other than the right brace, this is a post indexing
631 Parser.Lex(); // Eat right bracket token.
633 int OffsetRegNum = 0;
634 bool OffsetRegShifted = false;
635 enum ShiftType ShiftType;
636 const MCExpr *ShiftAmount;
637 const MCExpr *Offset = 0;
639 const AsmToken &NextTok = Parser.getTok();
640 if (NextTok.isNot(AsmToken::EndOfStatement)) {
643 if (NextTok.isNot(AsmToken::Comma)) {
644 Error(NextTok.getLoc(), "',' expected");
647 Parser.Lex(); // Eat comma token.
648 if (ParseMemoryOffsetReg(Negative, OffsetRegShifted, ShiftType,
649 ShiftAmount, Offset, OffsetIsReg, OffsetRegNum,
654 return ARMOperand::CreateMem(BaseRegNum, OffsetIsReg, Offset, OffsetRegNum,
655 OffsetRegShifted, ShiftType, ShiftAmount,
656 Preindexed, Postindexed, Negative, Writeback,
663 /// Parse the offset of a memory operand after we have seen "[Rn," or "[Rn],"
664 /// we will parse the following (were +/- means that a plus or minus is
669 /// we return false on success or an error otherwise.
670 bool ARMAsmParser::ParseMemoryOffsetReg(bool &Negative,
671 bool &OffsetRegShifted,
672 enum ShiftType &ShiftType,
673 const MCExpr *&ShiftAmount,
674 const MCExpr *&Offset,
679 OffsetRegShifted = false;
682 const AsmToken &NextTok = Parser.getTok();
683 E = NextTok.getLoc();
684 if (NextTok.is(AsmToken::Plus))
685 Parser.Lex(); // Eat plus token.
686 else if (NextTok.is(AsmToken::Minus)) {
688 Parser.Lex(); // Eat minus token
690 // See if there is a register following the "[Rn," or "[Rn]," we have so far.
691 const AsmToken &OffsetRegTok = Parser.getTok();
692 if (OffsetRegTok.is(AsmToken::Identifier)) {
693 SMLoc CurLoc = OffsetRegTok.getLoc();
694 OffsetRegNum = TryParseRegister();
695 if (OffsetRegNum != -1) {
701 // If we parsed a register as the offset then there can be a shift after that.
702 if (OffsetRegNum != -1) {
703 // Look for a comma then a shift
704 const AsmToken &Tok = Parser.getTok();
705 if (Tok.is(AsmToken::Comma)) {
706 Parser.Lex(); // Eat comma token.
708 const AsmToken &Tok = Parser.getTok();
709 if (ParseShift(ShiftType, ShiftAmount, E))
710 return Error(Tok.getLoc(), "shift expected");
711 OffsetRegShifted = true;
714 else { // the "[Rn," or "[Rn,]" we have so far was not followed by "Rm"
715 // Look for #offset following the "[Rn," or "[Rn],"
716 const AsmToken &HashTok = Parser.getTok();
717 if (HashTok.isNot(AsmToken::Hash))
718 return Error(HashTok.getLoc(), "'#' expected");
720 Parser.Lex(); // Eat hash token.
722 if (getParser().ParseExpression(Offset))
724 E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
729 /// ParseShift as one of these two:
730 /// ( lsl | lsr | asr | ror ) , # shift_amount
732 /// and returns true if it parses a shift otherwise it returns false.
733 bool ARMAsmParser::ParseShift(ShiftType &St, const MCExpr *&ShiftAmount,
735 const AsmToken &Tok = Parser.getTok();
736 if (Tok.isNot(AsmToken::Identifier))
738 StringRef ShiftName = Tok.getString();
739 if (ShiftName == "lsl" || ShiftName == "LSL")
741 else if (ShiftName == "lsr" || ShiftName == "LSR")
743 else if (ShiftName == "asr" || ShiftName == "ASR")
745 else if (ShiftName == "ror" || ShiftName == "ROR")
747 else if (ShiftName == "rrx" || ShiftName == "RRX")
751 Parser.Lex(); // Eat shift type token.
757 // Otherwise, there must be a '#' and a shift amount.
758 const AsmToken &HashTok = Parser.getTok();
759 if (HashTok.isNot(AsmToken::Hash))
760 return Error(HashTok.getLoc(), "'#' expected");
761 Parser.Lex(); // Eat hash token.
763 if (getParser().ParseExpression(ShiftAmount))
769 /// Parse a arm instruction operand. For now this parses the operand regardless
771 ARMOperand *ARMAsmParser::ParseOperand() {
773 switch (getLexer().getKind()) {
775 Error(Parser.getTok().getLoc(), "unexpected token in operand");
777 case AsmToken::Identifier:
778 if (ARMOperand *Op = TryParseRegisterWithWriteBack())
781 // This was not a register so parse other operands that start with an
782 // identifier (like labels) as expressions and create them as immediates.
784 S = Parser.getTok().getLoc();
785 if (getParser().ParseExpression(IdVal))
787 E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
788 return ARMOperand::CreateImm(IdVal, S, E);
789 case AsmToken::LBrac:
790 return ParseMemory();
791 case AsmToken::LCurly:
792 return ParseRegisterList();
795 // TODO: ":lower16:" and ":upper16:" modifiers after # before immediate
796 S = Parser.getTok().getLoc();
798 const MCExpr *ImmVal;
799 if (getParser().ParseExpression(ImmVal))
801 E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
802 return ARMOperand::CreateImm(ImmVal, S, E);
806 /// Parse an arm instruction mnemonic followed by its operands.
807 bool ARMAsmParser::ParseInstruction(StringRef Name, SMLoc NameLoc,
808 SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
809 // Create the leading tokens for the mnemonic, split by '.' characters.
810 size_t Start = 0, Next = Name.find('.');
811 StringRef Head = Name.slice(Start, Next);
813 // Determine the predicate, if any.
815 // FIXME: We need a way to check whether a prefix supports predication,
816 // otherwise we will end up with an ambiguity for instructions that happen to
817 // end with a predicate name.
818 // FIXME: Likewise, some arithmetic instructions have an 's' prefix which
819 // indicates to update the condition codes. Those instructions have an
820 // additional immediate operand which encodes the prefix as reg0 or CPSR.
821 // Just checking for a suffix of 's' definitely creates ambiguities; e.g,
822 // the SMMLS instruction.
823 unsigned CC = StringSwitch<unsigned>(Head.substr(Head.size()-2))
824 .Case("eq", ARMCC::EQ)
825 .Case("ne", ARMCC::NE)
826 .Case("hs", ARMCC::HS)
827 .Case("lo", ARMCC::LO)
828 .Case("mi", ARMCC::MI)
829 .Case("pl", ARMCC::PL)
830 .Case("vs", ARMCC::VS)
831 .Case("vc", ARMCC::VC)
832 .Case("hi", ARMCC::HI)
833 .Case("ls", ARMCC::LS)
834 .Case("ge", ARMCC::GE)
835 .Case("lt", ARMCC::LT)
836 .Case("gt", ARMCC::GT)
837 .Case("le", ARMCC::LE)
838 .Case("al", ARMCC::AL)
842 (CC == ARMCC::LS && (Head == "vmls" || Head == "vnmls"))) {
845 Head = Head.slice(0, Head.size() - 2);
848 Operands.push_back(ARMOperand::CreateToken(Head, NameLoc));
849 // FIXME: Should only add this operand for predicated instructions
850 Operands.push_back(ARMOperand::CreateCondCode(ARMCC::CondCodes(CC), NameLoc));
852 // Add the remaining tokens in the mnemonic.
853 while (Next != StringRef::npos) {
855 Next = Name.find('.', Start + 1);
856 Head = Name.slice(Start, Next);
858 Operands.push_back(ARMOperand::CreateToken(Head, NameLoc));
861 // Read the remaining operands.
862 if (getLexer().isNot(AsmToken::EndOfStatement)) {
863 // Read the first operand.
864 if (ARMOperand *Op = ParseOperand())
865 Operands.push_back(Op);
867 Parser.EatToEndOfStatement();
871 while (getLexer().is(AsmToken::Comma)) {
872 Parser.Lex(); // Eat the comma.
874 // Parse and remember the operand.
875 if (ARMOperand *Op = ParseOperand())
876 Operands.push_back(Op);
878 Parser.EatToEndOfStatement();
884 if (getLexer().isNot(AsmToken::EndOfStatement)) {
885 Parser.EatToEndOfStatement();
886 return TokError("unexpected token in argument list");
889 Parser.Lex(); // Consume the EndOfStatement
894 MatchAndEmitInstruction(SMLoc IDLoc,
895 SmallVectorImpl<MCParsedAsmOperand*> &Operands,
899 switch (MatchInstructionImpl(Operands, Inst, ErrorInfo)) {
901 Out.EmitInstruction(Inst);
903 case Match_MissingFeature:
904 Error(IDLoc, "instruction requires a CPU feature not currently enabled");
906 case Match_InvalidOperand: {
907 SMLoc ErrorLoc = IDLoc;
908 if (ErrorInfo != ~0U) {
909 if (ErrorInfo >= Operands.size())
910 return Error(IDLoc, "too few operands for instruction");
912 ErrorLoc = ((ARMOperand*)Operands[ErrorInfo])->getStartLoc();
913 if (ErrorLoc == SMLoc()) ErrorLoc = IDLoc;
916 return Error(ErrorLoc, "invalid operand for instruction");
918 case Match_MnemonicFail:
919 return Error(IDLoc, "unrecognized instruction mnemonic");
922 llvm_unreachable("Implement any new match types added!");
926 /// ParseDirective parses the arm specific directives
927 bool ARMAsmParser::ParseDirective(AsmToken DirectiveID) {
928 StringRef IDVal = DirectiveID.getIdentifier();
929 if (IDVal == ".word")
930 return ParseDirectiveWord(4, DirectiveID.getLoc());
931 else if (IDVal == ".thumb")
932 return ParseDirectiveThumb(DirectiveID.getLoc());
933 else if (IDVal == ".thumb_func")
934 return ParseDirectiveThumbFunc(DirectiveID.getLoc());
935 else if (IDVal == ".code")
936 return ParseDirectiveCode(DirectiveID.getLoc());
937 else if (IDVal == ".syntax")
938 return ParseDirectiveSyntax(DirectiveID.getLoc());
942 /// ParseDirectiveWord
943 /// ::= .word [ expression (, expression)* ]
944 bool ARMAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
945 if (getLexer().isNot(AsmToken::EndOfStatement)) {
948 if (getParser().ParseExpression(Value))
951 getParser().getStreamer().EmitValue(Value, Size, 0/*addrspace*/);
953 if (getLexer().is(AsmToken::EndOfStatement))
956 // FIXME: Improve diagnostic.
957 if (getLexer().isNot(AsmToken::Comma))
958 return Error(L, "unexpected token in directive");
967 /// ParseDirectiveThumb
969 bool ARMAsmParser::ParseDirectiveThumb(SMLoc L) {
970 if (getLexer().isNot(AsmToken::EndOfStatement))
971 return Error(L, "unexpected token in directive");
974 // TODO: set thumb mode
975 // TODO: tell the MC streamer the mode
976 // getParser().getStreamer().Emit???();
980 /// ParseDirectiveThumbFunc
981 /// ::= .thumbfunc symbol_name
982 bool ARMAsmParser::ParseDirectiveThumbFunc(SMLoc L) {
983 const AsmToken &Tok = Parser.getTok();
984 if (Tok.isNot(AsmToken::Identifier) && Tok.isNot(AsmToken::String))
985 return Error(L, "unexpected token in .thumb_func directive");
986 StringRef Name = Tok.getString();
987 Parser.Lex(); // Consume the identifier token.
988 if (getLexer().isNot(AsmToken::EndOfStatement))
989 return Error(L, "unexpected token in directive");
992 // Mark symbol as a thumb symbol.
993 MCSymbol *Func = getParser().getContext().GetOrCreateSymbol(Name);
994 getParser().getStreamer().EmitThumbFunc(Func);
998 /// ParseDirectiveSyntax
999 /// ::= .syntax unified | divided
1000 bool ARMAsmParser::ParseDirectiveSyntax(SMLoc L) {
1001 const AsmToken &Tok = Parser.getTok();
1002 if (Tok.isNot(AsmToken::Identifier))
1003 return Error(L, "unexpected token in .syntax directive");
1004 StringRef Mode = Tok.getString();
1005 if (Mode == "unified" || Mode == "UNIFIED")
1007 else if (Mode == "divided" || Mode == "DIVIDED")
1010 return Error(L, "unrecognized syntax mode in .syntax directive");
1012 if (getLexer().isNot(AsmToken::EndOfStatement))
1013 return Error(Parser.getTok().getLoc(), "unexpected token in directive");
1016 // TODO tell the MC streamer the mode
1017 // getParser().getStreamer().Emit???();
1021 /// ParseDirectiveCode
1022 /// ::= .code 16 | 32
1023 bool ARMAsmParser::ParseDirectiveCode(SMLoc L) {
1024 const AsmToken &Tok = Parser.getTok();
1025 if (Tok.isNot(AsmToken::Integer))
1026 return Error(L, "unexpected token in .code directive");
1027 int64_t Val = Parser.getTok().getIntVal();
1033 return Error(L, "invalid operand to .code directive");
1035 if (getLexer().isNot(AsmToken::EndOfStatement))
1036 return Error(Parser.getTok().getLoc(), "unexpected token in directive");
1040 getParser().getStreamer().EmitAssemblerFlag(MCAF_Code16);
1042 getParser().getStreamer().EmitAssemblerFlag(MCAF_Code32);
1047 extern "C" void LLVMInitializeARMAsmLexer();
1049 /// Force static initialization.
1050 extern "C" void LLVMInitializeARMAsmParser() {
1051 RegisterAsmParser<ARMAsmParser> X(TheARMTarget);
1052 RegisterAsmParser<ARMAsmParser> Y(TheThumbTarget);
1053 LLVMInitializeARMAsmLexer();
1056 #define GET_REGISTER_MATCHER
1057 #define GET_MATCHER_IMPLEMENTATION
1058 #include "ARMGenAsmMatcher.inc"