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 bool TryParseRegisterWithWriteBack(SmallVectorImpl<MCParsedAsmOperand*> &);
54 bool ParseRegisterList(SmallVectorImpl<MCParsedAsmOperand*> &);
55 bool ParseMemory(SmallVectorImpl<MCParsedAsmOperand*> &);
56 bool ParseOperand(SmallVectorImpl<MCParsedAsmOperand*> &);
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 {
116 SMLoc StartLoc, EndLoc;
117 SmallVector<unsigned, 8> Registers;
121 ARMCC::CondCodes Val;
137 // This is for all forms of ARM address expressions
140 unsigned OffsetRegNum; // used when OffsetIsReg is true
141 const MCExpr *Offset; // used when OffsetIsReg is false
142 const MCExpr *ShiftAmount; // used when OffsetRegShifted is true
143 enum ShiftType ShiftType; // used when OffsetRegShifted is true
144 unsigned OffsetRegShifted : 1; // only used when OffsetIsReg is true
145 unsigned Preindexed : 1;
146 unsigned Postindexed : 1;
147 unsigned OffsetIsReg : 1;
148 unsigned Negative : 1; // only used when OffsetIsReg is true
149 unsigned Writeback : 1;
153 ARMOperand(KindTy K) : MCParsedAsmOperand(), Kind(K) {}
155 ARMOperand(const ARMOperand &o) : MCParsedAsmOperand() {
157 StartLoc = o.StartLoc;
171 case DPRRegisterList:
172 case SPRRegisterList:
173 Registers = o.Registers;
184 /// getStartLoc - Get the location of the first token of this operand.
185 SMLoc getStartLoc() const { return StartLoc; }
186 /// getEndLoc - Get the location of the last token of this operand.
187 SMLoc getEndLoc() const { return EndLoc; }
189 ARMCC::CondCodes getCondCode() const {
190 assert(Kind == CondCode && "Invalid access!");
194 StringRef getToken() const {
195 assert(Kind == Token && "Invalid access!");
196 return StringRef(Tok.Data, Tok.Length);
199 unsigned getReg() const {
200 assert((Kind == Register || Kind == CCOut) && "Invalid access!");
204 const SmallVectorImpl<unsigned> &getRegList() const {
205 assert((Kind == RegisterList || Kind == DPRRegisterList ||
206 Kind == SPRRegisterList) && "Invalid access!");
210 const MCExpr *getImm() const {
211 assert(Kind == Immediate && "Invalid access!");
215 bool isCondCode() const { return Kind == CondCode; }
216 bool isCCOut() const { return Kind == CCOut; }
217 bool isImm() const { return Kind == Immediate; }
218 bool isReg() const { return Kind == Register; }
219 bool isRegList() const { return Kind == RegisterList; }
220 bool isDPRRegList() const { return Kind == DPRRegisterList; }
221 bool isSPRRegList() const { return Kind == SPRRegisterList; }
222 bool isToken() const { return Kind == Token; }
223 bool isMemory() const { return Kind == Memory; }
224 bool isMemMode5() const {
225 if (!isMemory() || Mem.OffsetIsReg || Mem.OffsetRegShifted ||
226 Mem.Writeback || Mem.Negative)
229 // If there is an offset expression, make sure it's valid.
230 if (!Mem.Offset) return true;
232 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
233 if (!CE) return false;
235 // The offset must be a multiple of 4 in the range 0-1020.
236 int64_t Value = CE->getValue();
237 return ((Value & 0x3) == 0 && Value <= 1020 && Value >= -1020);
239 bool isMemModeThumb() const {
240 if (!isMemory() || (!Mem.OffsetIsReg && !Mem.Offset) || Mem.Writeback)
243 if (!Mem.Offset) return true;
245 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
246 if (!CE) return false;
248 // The offset must be a multiple of 4 in the range 0-124.
249 uint64_t Value = CE->getValue();
250 return ((Value & 0x3) == 0 && Value <= 124);
253 void addExpr(MCInst &Inst, const MCExpr *Expr) const {
254 // Add as immediates when possible. Null MCExpr = 0.
256 Inst.addOperand(MCOperand::CreateImm(0));
257 else if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
258 Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
260 Inst.addOperand(MCOperand::CreateExpr(Expr));
263 void addCondCodeOperands(MCInst &Inst, unsigned N) const {
264 assert(N == 2 && "Invalid number of operands!");
265 Inst.addOperand(MCOperand::CreateImm(unsigned(getCondCode())));
266 unsigned RegNum = getCondCode() == ARMCC::AL ? 0: ARM::CPSR;
267 Inst.addOperand(MCOperand::CreateReg(RegNum));
270 void addCCOutOperands(MCInst &Inst, unsigned N) const {
271 assert(N == 1 && "Invalid number of operands!");
272 Inst.addOperand(MCOperand::CreateReg(getReg()));
275 void addRegOperands(MCInst &Inst, unsigned N) const {
276 assert(N == 1 && "Invalid number of operands!");
277 Inst.addOperand(MCOperand::CreateReg(getReg()));
280 void addRegListOperands(MCInst &Inst, unsigned N) const {
281 assert(N == 1 && "Invalid number of operands!");
282 const SmallVectorImpl<unsigned> &RegList = getRegList();
283 for (SmallVectorImpl<unsigned>::const_iterator
284 I = RegList.begin(), E = RegList.end(); I != E; ++I)
285 Inst.addOperand(MCOperand::CreateReg(*I));
288 void addDPRRegListOperands(MCInst &Inst, unsigned N) const {
289 addRegListOperands(Inst, N);
292 void addSPRRegListOperands(MCInst &Inst, unsigned N) const {
293 addRegListOperands(Inst, N);
296 void addImmOperands(MCInst &Inst, unsigned N) const {
297 assert(N == 1 && "Invalid number of operands!");
298 addExpr(Inst, getImm());
301 void addMemMode5Operands(MCInst &Inst, unsigned N) const {
302 assert(N == 2 && isMemMode5() && "Invalid number of operands!");
304 Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
305 assert(!Mem.OffsetIsReg && "Invalid mode 5 operand");
307 // FIXME: #-0 is encoded differently than #0. Does the parser preserve
310 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
311 assert(CE && "Non-constant mode 5 offset operand!");
313 // The MCInst offset operand doesn't include the low two bits (like
314 // the instruction encoding).
315 int64_t Offset = CE->getValue() / 4;
317 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add,
320 Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub,
323 Inst.addOperand(MCOperand::CreateImm(0));
327 void addMemModeThumbOperands(MCInst &Inst, unsigned N) const {
328 assert(N == 3 && isMemModeThumb() && "Invalid number of operands!");
329 Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
332 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
333 assert(CE && "Non-constant mode offset operand!");
334 Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
335 Inst.addOperand(MCOperand::CreateReg(0));
337 Inst.addOperand(MCOperand::CreateImm(0));
338 Inst.addOperand(MCOperand::CreateReg(Mem.OffsetRegNum));
342 virtual void dump(raw_ostream &OS) const;
344 static ARMOperand *CreateCondCode(ARMCC::CondCodes CC, SMLoc S) {
345 ARMOperand *Op = new ARMOperand(CondCode);
352 static ARMOperand *CreateCCOut(unsigned RegNum, SMLoc S) {
353 ARMOperand *Op = new ARMOperand(CCOut);
354 Op->Reg.RegNum = RegNum;
360 static ARMOperand *CreateToken(StringRef Str, SMLoc S) {
361 ARMOperand *Op = new ARMOperand(Token);
362 Op->Tok.Data = Str.data();
363 Op->Tok.Length = Str.size();
369 static ARMOperand *CreateReg(unsigned RegNum, SMLoc S, SMLoc E) {
370 ARMOperand *Op = new ARMOperand(Register);
371 Op->Reg.RegNum = RegNum;
378 CreateRegList(const SmallVectorImpl<std::pair<unsigned, SMLoc> > &Regs,
379 SMLoc StartLoc, SMLoc EndLoc) {
380 KindTy Kind = RegisterList;
382 if (ARM::DPRRegClass.contains(Regs.front().first))
383 Kind = DPRRegisterList;
384 else if (ARM::SPRRegClass.contains(Regs.front().first))
385 Kind = SPRRegisterList;
387 ARMOperand *Op = new ARMOperand(Kind);
388 for (SmallVectorImpl<std::pair<unsigned, SMLoc> >::const_iterator
389 I = Regs.begin(), E = Regs.end(); I != E; ++I)
390 Op->Registers.push_back(I->first);
391 array_pod_sort(Op->Registers.begin(), Op->Registers.end());
392 Op->StartLoc = StartLoc;
397 static ARMOperand *CreateImm(const MCExpr *Val, SMLoc S, SMLoc E) {
398 ARMOperand *Op = new ARMOperand(Immediate);
405 static ARMOperand *CreateMem(unsigned BaseRegNum, bool OffsetIsReg,
406 const MCExpr *Offset, unsigned OffsetRegNum,
407 bool OffsetRegShifted, enum ShiftType ShiftType,
408 const MCExpr *ShiftAmount, bool Preindexed,
409 bool Postindexed, bool Negative, bool Writeback,
411 ARMOperand *Op = new ARMOperand(Memory);
412 Op->Mem.BaseRegNum = BaseRegNum;
413 Op->Mem.OffsetIsReg = OffsetIsReg;
414 Op->Mem.Offset = Offset;
415 Op->Mem.OffsetRegNum = OffsetRegNum;
416 Op->Mem.OffsetRegShifted = OffsetRegShifted;
417 Op->Mem.ShiftType = ShiftType;
418 Op->Mem.ShiftAmount = ShiftAmount;
419 Op->Mem.Preindexed = Preindexed;
420 Op->Mem.Postindexed = Postindexed;
421 Op->Mem.Negative = Negative;
422 Op->Mem.Writeback = Writeback;
430 } // end anonymous namespace.
432 void ARMOperand::dump(raw_ostream &OS) const {
435 OS << ARMCondCodeToString(getCondCode());
438 OS << "<ccout " << getReg() << ">";
447 OS << "<register " << getReg() << ">";
450 case DPRRegisterList:
451 case SPRRegisterList: {
452 OS << "<register_list ";
454 const SmallVectorImpl<unsigned> &RegList = getRegList();
455 for (SmallVectorImpl<unsigned>::const_iterator
456 I = RegList.begin(), E = RegList.end(); I != E; ) {
458 if (++I < E) OS << ", ";
465 OS << "'" << getToken() << "'";
470 /// @name Auto-generated Match Functions
473 static unsigned MatchRegisterName(StringRef Name);
477 /// Try to parse a register name. The token must be an Identifier when called,
478 /// and if it is a register name the token is eaten and the register number is
479 /// returned. Otherwise return -1.
481 int ARMAsmParser::TryParseRegister() {
482 const AsmToken &Tok = Parser.getTok();
483 assert(Tok.is(AsmToken::Identifier) && "Token is not an Identifier");
485 // FIXME: Validate register for the current architecture; we have to do
486 // validation later, so maybe there is no need for this here.
487 unsigned RegNum = MatchRegisterName(Tok.getString());
490 Parser.Lex(); // Eat identifier token.
495 /// Try to parse a register name. The token must be an Identifier when called.
496 /// If it's a register, an AsmOperand is created. Another AsmOperand is created
497 /// if there is a "writeback". 'true' if it's not a register.
499 /// TODO this is likely to change to allow different register types and or to
500 /// parse for a specific register type.
502 TryParseRegisterWithWriteBack(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
503 SMLoc S = Parser.getTok().getLoc();
504 int RegNo = TryParseRegister();
508 Operands.push_back(ARMOperand::CreateReg(RegNo, S, Parser.getTok().getLoc()));
510 const AsmToken &ExclaimTok = Parser.getTok();
511 if (ExclaimTok.is(AsmToken::Exclaim)) {
512 Operands.push_back(ARMOperand::CreateToken(ExclaimTok.getString(),
513 ExclaimTok.getLoc()));
514 Parser.Lex(); // Eat exclaim token
520 /// Parse a register list, return it if successful else return null. The first
521 /// token must be a '{' when called.
523 ParseRegisterList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
524 assert(Parser.getTok().is(AsmToken::LCurly) &&
525 "Token is not a Left Curly Brace");
526 SMLoc S = Parser.getTok().getLoc();
528 // Read the rest of the registers in the list.
529 unsigned PrevRegNum = 0;
530 SmallVector<std::pair<unsigned, SMLoc>, 32> Registers;
533 bool IsRange = Parser.getTok().is(AsmToken::Minus);
534 Parser.Lex(); // Eat non-identifier token.
536 const AsmToken &RegTok = Parser.getTok();
537 SMLoc RegLoc = RegTok.getLoc();
538 if (RegTok.isNot(AsmToken::Identifier)) {
539 Error(RegLoc, "register expected");
543 int RegNum = TryParseRegister();
545 Error(RegLoc, "register expected");
550 int Reg = PrevRegNum;
553 Registers.push_back(std::make_pair(Reg, RegLoc));
554 } while (Reg != RegNum);
556 Registers.push_back(std::make_pair(RegNum, RegLoc));
560 } while (Parser.getTok().is(AsmToken::Comma) ||
561 Parser.getTok().is(AsmToken::Minus));
563 // Process the right curly brace of the list.
564 const AsmToken &RCurlyTok = Parser.getTok();
565 if (RCurlyTok.isNot(AsmToken::RCurly)) {
566 Error(RCurlyTok.getLoc(), "'}' expected");
570 SMLoc E = RCurlyTok.getLoc();
571 Parser.Lex(); // Eat right curly brace token.
573 // Verify the register list.
574 SmallVectorImpl<std::pair<unsigned, SMLoc> >::const_iterator
575 RI = Registers.begin(), RE = Registers.end();
577 DenseMap<unsigned, bool> RegMap;
578 RegMap[RI->first] = true;
580 unsigned HighRegNum = RI->first;
581 bool EmittedWarning = false;
583 for (++RI; RI != RE; ++RI) {
584 const std::pair<unsigned, SMLoc> &RegInfo = *RI;
585 unsigned Reg = RegInfo.first;
588 Error(RegInfo.second, "register duplicated in register list");
592 if (!EmittedWarning && Reg < HighRegNum)
593 Warning(RegInfo.second,
594 "register not in ascending order in register list");
597 HighRegNum = std::max(Reg, HighRegNum);
600 Operands.push_back(ARMOperand::CreateRegList(Registers, S, E));
604 /// Parse an ARM memory expression, return false if successful else return true
605 /// or an error. The first token must be a '[' when called.
607 /// TODO Only preindexing and postindexing addressing are started, unindexed
608 /// with option, etc are still to do.
610 ParseMemory(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
612 assert(Parser.getTok().is(AsmToken::LBrac) &&
613 "Token is not a Left Bracket");
614 S = Parser.getTok().getLoc();
615 Parser.Lex(); // Eat left bracket token.
617 const AsmToken &BaseRegTok = Parser.getTok();
618 if (BaseRegTok.isNot(AsmToken::Identifier)) {
619 Error(BaseRegTok.getLoc(), "register expected");
622 int BaseRegNum = TryParseRegister();
623 if (BaseRegNum == -1) {
624 Error(BaseRegTok.getLoc(), "register expected");
628 bool Preindexed = false;
629 bool Postindexed = false;
630 bool OffsetIsReg = false;
631 bool Negative = false;
632 bool Writeback = false;
634 // First look for preindexed address forms, that is after the "[Rn" we now
635 // have to see if the next token is a comma.
636 const AsmToken &Tok = Parser.getTok();
637 if (Tok.is(AsmToken::Comma)) {
639 Parser.Lex(); // Eat comma token.
641 bool OffsetRegShifted;
642 enum ShiftType ShiftType;
643 const MCExpr *ShiftAmount = 0;
644 const MCExpr *Offset = 0;
645 if (ParseMemoryOffsetReg(Negative, OffsetRegShifted, ShiftType, ShiftAmount,
646 Offset, OffsetIsReg, OffsetRegNum, E))
648 const AsmToken &RBracTok = Parser.getTok();
649 if (RBracTok.isNot(AsmToken::RBrac)) {
650 Error(RBracTok.getLoc(), "']' expected");
653 E = RBracTok.getLoc();
654 Parser.Lex(); // Eat right bracket token.
657 const AsmToken &ExclaimTok = Parser.getTok();
658 ARMOperand *WBOp = 0;
659 if (ExclaimTok.is(AsmToken::Exclaim)) {
660 WBOp = ARMOperand::CreateToken(ExclaimTok.getString(),
661 ExclaimTok.getLoc());
663 Parser.Lex(); // Eat exclaim token
666 Operands.push_back(ARMOperand::CreateMem(BaseRegNum, OffsetIsReg, Offset,
667 OffsetRegNum, OffsetRegShifted,
668 ShiftType, ShiftAmount, Preindexed,
669 Postindexed, Negative, Writeback,
672 Operands.push_back(WBOp);
676 // The "[Rn" we have so far was not followed by a comma.
677 else if (Tok.is(AsmToken::RBrac)) {
678 // If there's anything other than the right brace, this is a post indexing
681 Parser.Lex(); // Eat right bracket token.
683 int OffsetRegNum = 0;
684 bool OffsetRegShifted = false;
685 enum ShiftType ShiftType = Lsl;
686 const MCExpr *ShiftAmount = 0;
687 const MCExpr *Offset = 0;
689 const AsmToken &NextTok = Parser.getTok();
691 if (NextTok.isNot(AsmToken::EndOfStatement)) {
695 if (NextTok.isNot(AsmToken::Comma)) {
696 Error(NextTok.getLoc(), "',' expected");
700 Parser.Lex(); // Eat comma token.
702 if (ParseMemoryOffsetReg(Negative, OffsetRegShifted, ShiftType,
703 ShiftAmount, Offset, OffsetIsReg, OffsetRegNum,
708 Operands.push_back(ARMOperand::CreateMem(BaseRegNum, OffsetIsReg, Offset,
709 OffsetRegNum, OffsetRegShifted,
710 ShiftType, ShiftAmount, Preindexed,
711 Postindexed, Negative, Writeback,
719 /// Parse the offset of a memory operand after we have seen "[Rn," or "[Rn],"
720 /// we will parse the following (were +/- means that a plus or minus is
725 /// we return false on success or an error otherwise.
726 bool ARMAsmParser::ParseMemoryOffsetReg(bool &Negative,
727 bool &OffsetRegShifted,
728 enum ShiftType &ShiftType,
729 const MCExpr *&ShiftAmount,
730 const MCExpr *&Offset,
735 OffsetRegShifted = false;
738 const AsmToken &NextTok = Parser.getTok();
739 E = NextTok.getLoc();
740 if (NextTok.is(AsmToken::Plus))
741 Parser.Lex(); // Eat plus token.
742 else if (NextTok.is(AsmToken::Minus)) {
744 Parser.Lex(); // Eat minus token
746 // See if there is a register following the "[Rn," or "[Rn]," we have so far.
747 const AsmToken &OffsetRegTok = Parser.getTok();
748 if (OffsetRegTok.is(AsmToken::Identifier)) {
749 SMLoc CurLoc = OffsetRegTok.getLoc();
750 OffsetRegNum = TryParseRegister();
751 if (OffsetRegNum != -1) {
757 // If we parsed a register as the offset then there can be a shift after that.
758 if (OffsetRegNum != -1) {
759 // Look for a comma then a shift
760 const AsmToken &Tok = Parser.getTok();
761 if (Tok.is(AsmToken::Comma)) {
762 Parser.Lex(); // Eat comma token.
764 const AsmToken &Tok = Parser.getTok();
765 if (ParseShift(ShiftType, ShiftAmount, E))
766 return Error(Tok.getLoc(), "shift expected");
767 OffsetRegShifted = true;
770 else { // the "[Rn," or "[Rn,]" we have so far was not followed by "Rm"
771 // Look for #offset following the "[Rn," or "[Rn],"
772 const AsmToken &HashTok = Parser.getTok();
773 if (HashTok.isNot(AsmToken::Hash))
774 return Error(HashTok.getLoc(), "'#' expected");
776 Parser.Lex(); // Eat hash token.
778 if (getParser().ParseExpression(Offset))
780 E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
785 /// ParseShift as one of these two:
786 /// ( lsl | lsr | asr | ror ) , # shift_amount
788 /// and returns true if it parses a shift otherwise it returns false.
789 bool ARMAsmParser::ParseShift(ShiftType &St, const MCExpr *&ShiftAmount,
791 const AsmToken &Tok = Parser.getTok();
792 if (Tok.isNot(AsmToken::Identifier))
794 StringRef ShiftName = Tok.getString();
795 if (ShiftName == "lsl" || ShiftName == "LSL")
797 else if (ShiftName == "lsr" || ShiftName == "LSR")
799 else if (ShiftName == "asr" || ShiftName == "ASR")
801 else if (ShiftName == "ror" || ShiftName == "ROR")
803 else if (ShiftName == "rrx" || ShiftName == "RRX")
807 Parser.Lex(); // Eat shift type token.
813 // Otherwise, there must be a '#' and a shift amount.
814 const AsmToken &HashTok = Parser.getTok();
815 if (HashTok.isNot(AsmToken::Hash))
816 return Error(HashTok.getLoc(), "'#' expected");
817 Parser.Lex(); // Eat hash token.
819 if (getParser().ParseExpression(ShiftAmount))
825 /// Parse a arm instruction operand. For now this parses the operand regardless
827 bool ARMAsmParser::ParseOperand(SmallVectorImpl<MCParsedAsmOperand*> &Operands){
829 switch (getLexer().getKind()) {
831 Error(Parser.getTok().getLoc(), "unexpected token in operand");
833 case AsmToken::Identifier: {
834 if (!TryParseRegisterWithWriteBack(Operands))
837 // This was not a register so parse other operands that start with an
838 // identifier (like labels) as expressions and create them as immediates.
840 S = Parser.getTok().getLoc();
841 if (getParser().ParseExpression(IdVal))
843 E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
844 Operands.push_back(ARMOperand::CreateImm(IdVal, S, E));
847 case AsmToken::LBrac:
848 return ParseMemory(Operands);
849 case AsmToken::LCurly:
850 return ParseRegisterList(Operands);
853 // TODO: ":lower16:" and ":upper16:" modifiers after # before immediate
854 S = Parser.getTok().getLoc();
856 const MCExpr *ImmVal;
857 if (getParser().ParseExpression(ImmVal))
859 E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() - 1);
860 Operands.push_back(ARMOperand::CreateImm(ImmVal, S, E));
865 /// Parse an arm instruction mnemonic followed by its operands.
866 bool ARMAsmParser::ParseInstruction(StringRef Name, SMLoc NameLoc,
867 SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
868 // Create the leading tokens for the mnemonic, split by '.' characters.
869 size_t Start = 0, Next = Name.find('.');
870 StringRef Head = Name.slice(Start, Next);
872 // Determine the predicate, if any.
874 // FIXME: We need a way to check whether a prefix supports predication,
875 // otherwise we will end up with an ambiguity for instructions that happen to
876 // end with a predicate name.
877 // FIXME: Likewise, some arithmetic instructions have an 's' prefix which
878 // indicates to update the condition codes. Those instructions have an
879 // additional immediate operand which encodes the prefix as reg0 or CPSR.
880 // Just checking for a suffix of 's' definitely creates ambiguities; e.g,
881 // the SMMLS instruction.
882 unsigned CC = StringSwitch<unsigned>(Head.substr(Head.size()-2))
883 .Case("eq", ARMCC::EQ)
884 .Case("ne", ARMCC::NE)
885 .Case("hs", ARMCC::HS)
886 .Case("lo", ARMCC::LO)
887 .Case("mi", ARMCC::MI)
888 .Case("pl", ARMCC::PL)
889 .Case("vs", ARMCC::VS)
890 .Case("vc", ARMCC::VC)
891 .Case("hi", ARMCC::HI)
892 .Case("ls", ARMCC::LS)
893 .Case("ge", ARMCC::GE)
894 .Case("lt", ARMCC::LT)
895 .Case("gt", ARMCC::GT)
896 .Case("le", ARMCC::LE)
897 .Case("al", ARMCC::AL)
901 (CC == ARMCC::LS && (Head == "vmls" || Head == "vnmls"))) {
904 Head = Head.slice(0, Head.size() - 2);
907 Operands.push_back(ARMOperand::CreateToken(Head, NameLoc));
910 // FIXME: Should only add this operand for predicated instructions
911 Operands.push_back(ARMOperand::CreateCondCode(ARMCC::CondCodes(CC),
914 // Add the remaining tokens in the mnemonic.
915 while (Next != StringRef::npos) {
917 Next = Name.find('.', Start + 1);
918 Head = Name.slice(Start, Next);
920 Operands.push_back(ARMOperand::CreateToken(Head, NameLoc));
923 // Read the remaining operands.
924 if (getLexer().isNot(AsmToken::EndOfStatement)) {
925 // Read the first operand.
926 if (ParseOperand(Operands)) {
927 Parser.EatToEndOfStatement();
931 while (getLexer().is(AsmToken::Comma)) {
932 Parser.Lex(); // Eat the comma.
934 // Parse and remember the operand.
935 if (ParseOperand(Operands)) {
936 Parser.EatToEndOfStatement();
942 if (getLexer().isNot(AsmToken::EndOfStatement)) {
943 Parser.EatToEndOfStatement();
944 return TokError("unexpected token in argument list");
947 Parser.Lex(); // Consume the EndOfStatement
952 MatchAndEmitInstruction(SMLoc IDLoc,
953 SmallVectorImpl<MCParsedAsmOperand*> &Operands,
957 switch (MatchInstructionImpl(Operands, Inst, ErrorInfo)) {
959 Out.EmitInstruction(Inst);
961 case Match_MissingFeature:
962 Error(IDLoc, "instruction requires a CPU feature not currently enabled");
964 case Match_InvalidOperand: {
965 SMLoc ErrorLoc = IDLoc;
966 if (ErrorInfo != ~0U) {
967 if (ErrorInfo >= Operands.size())
968 return Error(IDLoc, "too few operands for instruction");
970 ErrorLoc = ((ARMOperand*)Operands[ErrorInfo])->getStartLoc();
971 if (ErrorLoc == SMLoc()) ErrorLoc = IDLoc;
974 return Error(ErrorLoc, "invalid operand for instruction");
976 case Match_MnemonicFail:
977 return Error(IDLoc, "unrecognized instruction mnemonic");
980 llvm_unreachable("Implement any new match types added!");
984 /// ParseDirective parses the arm specific directives
985 bool ARMAsmParser::ParseDirective(AsmToken DirectiveID) {
986 StringRef IDVal = DirectiveID.getIdentifier();
987 if (IDVal == ".word")
988 return ParseDirectiveWord(4, DirectiveID.getLoc());
989 else if (IDVal == ".thumb")
990 return ParseDirectiveThumb(DirectiveID.getLoc());
991 else if (IDVal == ".thumb_func")
992 return ParseDirectiveThumbFunc(DirectiveID.getLoc());
993 else if (IDVal == ".code")
994 return ParseDirectiveCode(DirectiveID.getLoc());
995 else if (IDVal == ".syntax")
996 return ParseDirectiveSyntax(DirectiveID.getLoc());
1000 /// ParseDirectiveWord
1001 /// ::= .word [ expression (, expression)* ]
1002 bool ARMAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
1003 if (getLexer().isNot(AsmToken::EndOfStatement)) {
1005 const MCExpr *Value;
1006 if (getParser().ParseExpression(Value))
1009 getParser().getStreamer().EmitValue(Value, Size, 0/*addrspace*/);
1011 if (getLexer().is(AsmToken::EndOfStatement))
1014 // FIXME: Improve diagnostic.
1015 if (getLexer().isNot(AsmToken::Comma))
1016 return Error(L, "unexpected token in directive");
1025 /// ParseDirectiveThumb
1027 bool ARMAsmParser::ParseDirectiveThumb(SMLoc L) {
1028 if (getLexer().isNot(AsmToken::EndOfStatement))
1029 return Error(L, "unexpected token in directive");
1032 // TODO: set thumb mode
1033 // TODO: tell the MC streamer the mode
1034 // getParser().getStreamer().Emit???();
1038 /// ParseDirectiveThumbFunc
1039 /// ::= .thumbfunc symbol_name
1040 bool ARMAsmParser::ParseDirectiveThumbFunc(SMLoc L) {
1041 const AsmToken &Tok = Parser.getTok();
1042 if (Tok.isNot(AsmToken::Identifier) && Tok.isNot(AsmToken::String))
1043 return Error(L, "unexpected token in .thumb_func directive");
1044 StringRef Name = Tok.getString();
1045 Parser.Lex(); // Consume the identifier token.
1046 if (getLexer().isNot(AsmToken::EndOfStatement))
1047 return Error(L, "unexpected token in directive");
1050 // Mark symbol as a thumb symbol.
1051 MCSymbol *Func = getParser().getContext().GetOrCreateSymbol(Name);
1052 getParser().getStreamer().EmitThumbFunc(Func);
1056 /// ParseDirectiveSyntax
1057 /// ::= .syntax unified | divided
1058 bool ARMAsmParser::ParseDirectiveSyntax(SMLoc L) {
1059 const AsmToken &Tok = Parser.getTok();
1060 if (Tok.isNot(AsmToken::Identifier))
1061 return Error(L, "unexpected token in .syntax directive");
1062 StringRef Mode = Tok.getString();
1063 if (Mode == "unified" || Mode == "UNIFIED")
1065 else if (Mode == "divided" || Mode == "DIVIDED")
1068 return Error(L, "unrecognized syntax mode in .syntax directive");
1070 if (getLexer().isNot(AsmToken::EndOfStatement))
1071 return Error(Parser.getTok().getLoc(), "unexpected token in directive");
1074 // TODO tell the MC streamer the mode
1075 // getParser().getStreamer().Emit???();
1079 /// ParseDirectiveCode
1080 /// ::= .code 16 | 32
1081 bool ARMAsmParser::ParseDirectiveCode(SMLoc L) {
1082 const AsmToken &Tok = Parser.getTok();
1083 if (Tok.isNot(AsmToken::Integer))
1084 return Error(L, "unexpected token in .code directive");
1085 int64_t Val = Parser.getTok().getIntVal();
1091 return Error(L, "invalid operand to .code directive");
1093 if (getLexer().isNot(AsmToken::EndOfStatement))
1094 return Error(Parser.getTok().getLoc(), "unexpected token in directive");
1098 getParser().getStreamer().EmitAssemblerFlag(MCAF_Code16);
1100 getParser().getStreamer().EmitAssemblerFlag(MCAF_Code32);
1105 extern "C" void LLVMInitializeARMAsmLexer();
1107 /// Force static initialization.
1108 extern "C" void LLVMInitializeARMAsmParser() {
1109 RegisterAsmParser<ARMAsmParser> X(TheARMTarget);
1110 RegisterAsmParser<ARMAsmParser> Y(TheThumbTarget);
1111 LLVMInitializeARMAsmLexer();
1114 #define GET_REGISTER_MATCHER
1115 #define GET_MATCHER_IMPLEMENTATION
1116 #include "ARMGenAsmMatcher.inc"