1 //===-- X86AsmParser.cpp - Parse X86 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 //===----------------------------------------------------------------------===//
10 #include "llvm/Target/TargetAsmParser.h"
12 #include "X86Subtarget.h"
13 #include "llvm/ADT/SmallString.h"
14 #include "llvm/ADT/SmallVector.h"
15 #include "llvm/ADT/StringSwitch.h"
16 #include "llvm/ADT/Twine.h"
17 #include "llvm/MC/MCStreamer.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCParser/MCAsmLexer.h"
21 #include "llvm/MC/MCParser/MCAsmParser.h"
22 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
23 #include "llvm/Support/SourceMgr.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/Target/TargetRegistry.h"
26 #include "llvm/Target/TargetAsmParser.h"
32 class X86ATTAsmParser : public TargetAsmParser {
40 MCAsmParser &getParser() const { return Parser; }
42 MCAsmLexer &getLexer() const { return Parser.getLexer(); }
44 bool Error(SMLoc L, const Twine &Msg) { return Parser.Error(L, Msg); }
46 bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc);
48 X86Operand *ParseOperand();
49 X86Operand *ParseMemOperand(unsigned SegReg, SMLoc StartLoc);
51 bool ParseDirectiveWord(unsigned Size, SMLoc L);
53 bool MatchInstruction(SMLoc IDLoc,
54 const SmallVectorImpl<MCParsedAsmOperand*> &Operands,
57 /// @name Auto-generated Matcher Functions
60 #define GET_ASSEMBLER_HEADER
61 #include "X86GenAsmMatcher.inc"
66 X86ATTAsmParser(const Target &T, MCAsmParser &_Parser, TargetMachine &TM)
67 : TargetAsmParser(T), Parser(_Parser), TM(TM) {
69 // Initialize the set of available features.
70 setAvailableFeatures(ComputeAvailableFeatures(
71 &TM.getSubtarget<X86Subtarget>()));
74 virtual bool ParseInstruction(StringRef Name, SMLoc NameLoc,
75 SmallVectorImpl<MCParsedAsmOperand*> &Operands);
77 virtual bool ParseDirective(AsmToken DirectiveID);
80 class X86_32ATTAsmParser : public X86ATTAsmParser {
82 X86_32ATTAsmParser(const Target &T, MCAsmParser &_Parser, TargetMachine &TM)
83 : X86ATTAsmParser(T, _Parser, TM) {
88 class X86_64ATTAsmParser : public X86ATTAsmParser {
90 X86_64ATTAsmParser(const Target &T, MCAsmParser &_Parser, TargetMachine &TM)
91 : X86ATTAsmParser(T, _Parser, TM) {
96 } // end anonymous namespace
98 /// @name Auto-generated Match Functions
101 static unsigned MatchRegisterName(StringRef Name);
107 /// X86Operand - Instances of this class represent a parsed X86 machine
109 struct X86Operand : public MCParsedAsmOperand {
117 SMLoc StartLoc, EndLoc;
142 X86Operand(KindTy K, SMLoc Start, SMLoc End)
143 : Kind(K), StartLoc(Start), EndLoc(End) {}
145 /// getStartLoc - Get the location of the first token of this operand.
146 SMLoc getStartLoc() const { return StartLoc; }
147 /// getEndLoc - Get the location of the last token of this operand.
148 SMLoc getEndLoc() const { return EndLoc; }
150 virtual void dump(raw_ostream &OS) const {}
152 StringRef getToken() const {
153 assert(Kind == Token && "Invalid access!");
154 return StringRef(Tok.Data, Tok.Length);
156 void setTokenValue(StringRef Value) {
157 assert(Kind == Token && "Invalid access!");
158 Tok.Data = Value.data();
159 Tok.Length = Value.size();
162 unsigned getReg() const {
163 assert(Kind == Register && "Invalid access!");
167 const MCExpr *getImm() const {
168 assert(Kind == Immediate && "Invalid access!");
172 const MCExpr *getMemDisp() const {
173 assert(Kind == Memory && "Invalid access!");
176 unsigned getMemSegReg() const {
177 assert(Kind == Memory && "Invalid access!");
180 unsigned getMemBaseReg() const {
181 assert(Kind == Memory && "Invalid access!");
184 unsigned getMemIndexReg() const {
185 assert(Kind == Memory && "Invalid access!");
188 unsigned getMemScale() const {
189 assert(Kind == Memory && "Invalid access!");
193 bool isToken() const {return Kind == Token; }
195 bool isImm() const { return Kind == Immediate; }
197 bool isImmSExti16i8() const {
201 // If this isn't a constant expr, just assume it fits and let relaxation
203 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
207 // Otherwise, check the value is in a range that makes sense for this
209 uint64_t Value = CE->getValue();
210 return (( Value <= 0x000000000000007FULL)||
211 (0x000000000000FF80ULL <= Value && Value <= 0x000000000000FFFFULL)||
212 (0xFFFFFFFFFFFFFF80ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
214 bool isImmSExti32i8() const {
218 // If this isn't a constant expr, just assume it fits and let relaxation
220 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
224 // Otherwise, check the value is in a range that makes sense for this
226 uint64_t Value = CE->getValue();
227 return (( Value <= 0x000000000000007FULL)||
228 (0x00000000FFFFFF80ULL <= Value && Value <= 0x00000000FFFFFFFFULL)||
229 (0xFFFFFFFFFFFFFF80ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
231 bool isImmSExti64i8() const {
235 // If this isn't a constant expr, just assume it fits and let relaxation
237 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
241 // Otherwise, check the value is in a range that makes sense for this
243 uint64_t Value = CE->getValue();
244 return (( Value <= 0x000000000000007FULL)||
245 (0xFFFFFFFFFFFFFF80ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
247 bool isImmSExti64i32() const {
251 // If this isn't a constant expr, just assume it fits and let relaxation
253 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
257 // Otherwise, check the value is in a range that makes sense for this
259 uint64_t Value = CE->getValue();
260 return (( Value <= 0x000000007FFFFFFFULL)||
261 (0xFFFFFFFF80000000ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
264 bool isMem() const { return Kind == Memory; }
266 bool isAbsMem() const {
267 return Kind == Memory && !getMemSegReg() && !getMemBaseReg() &&
268 !getMemIndexReg() && getMemScale() == 1;
271 bool isReg() const { return Kind == Register; }
273 void addExpr(MCInst &Inst, const MCExpr *Expr) const {
274 // Add as immediates when possible.
275 if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
276 Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
278 Inst.addOperand(MCOperand::CreateExpr(Expr));
281 void addRegOperands(MCInst &Inst, unsigned N) const {
282 assert(N == 1 && "Invalid number of operands!");
283 Inst.addOperand(MCOperand::CreateReg(getReg()));
286 void addImmOperands(MCInst &Inst, unsigned N) const {
287 assert(N == 1 && "Invalid number of operands!");
288 addExpr(Inst, getImm());
291 void addMemOperands(MCInst &Inst, unsigned N) const {
292 assert((N == 5) && "Invalid number of operands!");
293 Inst.addOperand(MCOperand::CreateReg(getMemBaseReg()));
294 Inst.addOperand(MCOperand::CreateImm(getMemScale()));
295 Inst.addOperand(MCOperand::CreateReg(getMemIndexReg()));
296 addExpr(Inst, getMemDisp());
297 Inst.addOperand(MCOperand::CreateReg(getMemSegReg()));
300 void addAbsMemOperands(MCInst &Inst, unsigned N) const {
301 assert((N == 1) && "Invalid number of operands!");
302 Inst.addOperand(MCOperand::CreateExpr(getMemDisp()));
305 static X86Operand *CreateToken(StringRef Str, SMLoc Loc) {
306 X86Operand *Res = new X86Operand(Token, Loc, Loc);
307 Res->Tok.Data = Str.data();
308 Res->Tok.Length = Str.size();
312 static X86Operand *CreateReg(unsigned RegNo, SMLoc StartLoc, SMLoc EndLoc) {
313 X86Operand *Res = new X86Operand(Register, StartLoc, EndLoc);
314 Res->Reg.RegNo = RegNo;
318 static X86Operand *CreateImm(const MCExpr *Val, SMLoc StartLoc, SMLoc EndLoc){
319 X86Operand *Res = new X86Operand(Immediate, StartLoc, EndLoc);
324 /// Create an absolute memory operand.
325 static X86Operand *CreateMem(const MCExpr *Disp, SMLoc StartLoc,
327 X86Operand *Res = new X86Operand(Memory, StartLoc, EndLoc);
329 Res->Mem.Disp = Disp;
330 Res->Mem.BaseReg = 0;
331 Res->Mem.IndexReg = 0;
336 /// Create a generalized memory operand.
337 static X86Operand *CreateMem(unsigned SegReg, const MCExpr *Disp,
338 unsigned BaseReg, unsigned IndexReg,
339 unsigned Scale, SMLoc StartLoc, SMLoc EndLoc) {
340 // We should never just have a displacement, that should be parsed as an
341 // absolute memory operand.
342 assert((SegReg || BaseReg || IndexReg) && "Invalid memory operand!");
344 // The scale should always be one of {1,2,4,8}.
345 assert(((Scale == 1 || Scale == 2 || Scale == 4 || Scale == 8)) &&
347 X86Operand *Res = new X86Operand(Memory, StartLoc, EndLoc);
348 Res->Mem.SegReg = SegReg;
349 Res->Mem.Disp = Disp;
350 Res->Mem.BaseReg = BaseReg;
351 Res->Mem.IndexReg = IndexReg;
352 Res->Mem.Scale = Scale;
357 } // end anonymous namespace.
360 bool X86ATTAsmParser::ParseRegister(unsigned &RegNo,
361 SMLoc &StartLoc, SMLoc &EndLoc) {
363 const AsmToken &TokPercent = Parser.getTok();
364 assert(TokPercent.is(AsmToken::Percent) && "Invalid token kind!");
365 StartLoc = TokPercent.getLoc();
366 Parser.Lex(); // Eat percent token.
368 const AsmToken &Tok = Parser.getTok();
369 if (Tok.isNot(AsmToken::Identifier))
370 return Error(Tok.getLoc(), "invalid register name");
372 // FIXME: Validate register for the current architecture; we have to do
373 // validation later, so maybe there is no need for this here.
374 RegNo = MatchRegisterName(Tok.getString());
376 // FIXME: This should be done using Requires<In32BitMode> and
377 // Requires<In64BitMode> so "eiz" usage in 64-bit instructions
378 // can be also checked.
379 if (RegNo == X86::RIZ && !Is64Bit)
380 return Error(Tok.getLoc(), "riz register in 64-bit mode only");
382 // Parse %st(1) and "%st" as "%st(0)"
383 if (RegNo == 0 && Tok.getString() == "st") {
385 EndLoc = Tok.getLoc();
386 Parser.Lex(); // Eat 'st'
388 // Check to see if we have '(4)' after %st.
389 if (getLexer().isNot(AsmToken::LParen))
394 const AsmToken &IntTok = Parser.getTok();
395 if (IntTok.isNot(AsmToken::Integer))
396 return Error(IntTok.getLoc(), "expected stack index");
397 switch (IntTok.getIntVal()) {
398 case 0: RegNo = X86::ST0; break;
399 case 1: RegNo = X86::ST1; break;
400 case 2: RegNo = X86::ST2; break;
401 case 3: RegNo = X86::ST3; break;
402 case 4: RegNo = X86::ST4; break;
403 case 5: RegNo = X86::ST5; break;
404 case 6: RegNo = X86::ST6; break;
405 case 7: RegNo = X86::ST7; break;
406 default: return Error(IntTok.getLoc(), "invalid stack index");
409 if (getParser().Lex().isNot(AsmToken::RParen))
410 return Error(Parser.getTok().getLoc(), "expected ')'");
412 EndLoc = Tok.getLoc();
413 Parser.Lex(); // Eat ')'
417 // If this is "db[0-7]", match it as an alias
419 if (RegNo == 0 && Tok.getString().size() == 3 &&
420 Tok.getString().startswith("db")) {
421 switch (Tok.getString()[2]) {
422 case '0': RegNo = X86::DR0; break;
423 case '1': RegNo = X86::DR1; break;
424 case '2': RegNo = X86::DR2; break;
425 case '3': RegNo = X86::DR3; break;
426 case '4': RegNo = X86::DR4; break;
427 case '5': RegNo = X86::DR5; break;
428 case '6': RegNo = X86::DR6; break;
429 case '7': RegNo = X86::DR7; break;
433 EndLoc = Tok.getLoc();
434 Parser.Lex(); // Eat it.
440 return Error(Tok.getLoc(), "invalid register name");
442 EndLoc = Tok.getLoc();
443 Parser.Lex(); // Eat identifier token.
447 X86Operand *X86ATTAsmParser::ParseOperand() {
448 switch (getLexer().getKind()) {
450 // Parse a memory operand with no segment register.
451 return ParseMemOperand(0, Parser.getTok().getLoc());
452 case AsmToken::Percent: {
453 // Read the register.
456 if (ParseRegister(RegNo, Start, End)) return 0;
457 if (RegNo == X86::EIZ || RegNo == X86::RIZ) {
458 Error(Start, "eiz and riz can only be used as index registers");
462 // If this is a segment register followed by a ':', then this is the start
463 // of a memory reference, otherwise this is a normal register reference.
464 if (getLexer().isNot(AsmToken::Colon))
465 return X86Operand::CreateReg(RegNo, Start, End);
468 getParser().Lex(); // Eat the colon.
469 return ParseMemOperand(RegNo, Start);
471 case AsmToken::Dollar: {
473 SMLoc Start = Parser.getTok().getLoc(), End;
476 if (getParser().ParseExpression(Val, End))
478 return X86Operand::CreateImm(Val, Start, End);
483 /// ParseMemOperand: segment: disp(basereg, indexreg, scale). The '%ds:' prefix
484 /// has already been parsed if present.
485 X86Operand *X86ATTAsmParser::ParseMemOperand(unsigned SegReg, SMLoc MemStart) {
487 // We have to disambiguate a parenthesized expression "(4+5)" from the start
488 // of a memory operand with a missing displacement "(%ebx)" or "(,%eax)". The
489 // only way to do this without lookahead is to eat the '(' and see what is
491 const MCExpr *Disp = MCConstantExpr::Create(0, getParser().getContext());
492 if (getLexer().isNot(AsmToken::LParen)) {
494 if (getParser().ParseExpression(Disp, ExprEnd)) return 0;
496 // After parsing the base expression we could either have a parenthesized
497 // memory address or not. If not, return now. If so, eat the (.
498 if (getLexer().isNot(AsmToken::LParen)) {
499 // Unless we have a segment register, treat this as an immediate.
501 return X86Operand::CreateMem(Disp, MemStart, ExprEnd);
502 return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, MemStart, ExprEnd);
508 // Okay, we have a '('. We don't know if this is an expression or not, but
509 // so we have to eat the ( to see beyond it.
510 SMLoc LParenLoc = Parser.getTok().getLoc();
511 Parser.Lex(); // Eat the '('.
513 if (getLexer().is(AsmToken::Percent) || getLexer().is(AsmToken::Comma)) {
514 // Nothing to do here, fall into the code below with the '(' part of the
515 // memory operand consumed.
519 // It must be an parenthesized expression, parse it now.
520 if (getParser().ParseParenExpression(Disp, ExprEnd))
523 // After parsing the base expression we could either have a parenthesized
524 // memory address or not. If not, return now. If so, eat the (.
525 if (getLexer().isNot(AsmToken::LParen)) {
526 // Unless we have a segment register, treat this as an immediate.
528 return X86Operand::CreateMem(Disp, LParenLoc, ExprEnd);
529 return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, MemStart, ExprEnd);
537 // If we reached here, then we just ate the ( of the memory operand. Process
538 // the rest of the memory operand.
539 unsigned BaseReg = 0, IndexReg = 0, Scale = 1;
541 if (getLexer().is(AsmToken::Percent)) {
543 if (ParseRegister(BaseReg, L, L)) return 0;
544 if (BaseReg == X86::EIZ || BaseReg == X86::RIZ) {
545 Error(L, "eiz and riz can only be used as index registers");
550 if (getLexer().is(AsmToken::Comma)) {
551 Parser.Lex(); // Eat the comma.
553 // Following the comma we should have either an index register, or a scale
554 // value. We don't support the later form, but we want to parse it
557 // Not that even though it would be completely consistent to support syntax
558 // like "1(%eax,,1)", the assembler doesn't. Use "eiz" or "riz" for this.
559 if (getLexer().is(AsmToken::Percent)) {
561 if (ParseRegister(IndexReg, L, L)) return 0;
563 if (getLexer().isNot(AsmToken::RParen)) {
564 // Parse the scale amount:
565 // ::= ',' [scale-expression]
566 if (getLexer().isNot(AsmToken::Comma)) {
567 Error(Parser.getTok().getLoc(),
568 "expected comma in scale expression");
571 Parser.Lex(); // Eat the comma.
573 if (getLexer().isNot(AsmToken::RParen)) {
574 SMLoc Loc = Parser.getTok().getLoc();
577 if (getParser().ParseAbsoluteExpression(ScaleVal))
580 // Validate the scale amount.
581 if (ScaleVal != 1 && ScaleVal != 2 && ScaleVal != 4 && ScaleVal != 8){
582 Error(Loc, "scale factor in address must be 1, 2, 4 or 8");
585 Scale = (unsigned)ScaleVal;
588 } else if (getLexer().isNot(AsmToken::RParen)) {
589 // A scale amount without an index is ignored.
591 SMLoc Loc = Parser.getTok().getLoc();
594 if (getParser().ParseAbsoluteExpression(Value))
598 Warning(Loc, "scale factor without index register is ignored");
603 // Ok, we've eaten the memory operand, verify we have a ')' and eat it too.
604 if (getLexer().isNot(AsmToken::RParen)) {
605 Error(Parser.getTok().getLoc(), "unexpected token in memory operand");
608 SMLoc MemEnd = Parser.getTok().getLoc();
609 Parser.Lex(); // Eat the ')'.
611 return X86Operand::CreateMem(SegReg, Disp, BaseReg, IndexReg, Scale,
615 bool X86ATTAsmParser::
616 ParseInstruction(StringRef Name, SMLoc NameLoc,
617 SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
619 // The "Jump if rCX Zero" form jcxz is not allowed in 64-bit mode and
620 // the form jrcxz is not allowed in 32-bit mode.
622 // FIXME: We can do jcxz/jecxz, we just don't have the encoding right yet.
623 if (Name == "jcxz" || Name == "jecxz")
624 return Error(NameLoc, Name + " cannot be encoded in 64-bit mode");
627 // FIXME: Hack to recognize "sal..." and "rep..." for now. We need a way to
628 // represent alternative syntaxes in the .td file, without requiring
629 // instruction duplication.
630 StringRef PatchedName = StringSwitch<StringRef>(Name)
632 .Case("salb", "shlb")
633 .Case("sall", "shll")
634 .Case("salq", "shlq")
635 .Case("salw", "shlw")
638 .Case("repnz", "repne")
639 .Case("push", Is64Bit ? "pushq" : "pushl")
640 .Case("pushf", Is64Bit ? "pushfq" : "pushfl")
641 .Case("popf", Is64Bit ? "popfq" : "popfl")
642 .Case("retl", Is64Bit ? "retl" : "ret")
643 .Case("retq", Is64Bit ? "ret" : "retq")
644 .Case("setz", "sete")
645 .Case("setnz", "setne")
649 // FIXME: in 32-bit mode jcxz requires an AdSize prefix. In 64-bit mode
650 // jecxz requires an AdSize prefix but jecxz does not have a prefix in
652 .Case("jecxz", "jcxz")
653 .Case("jrcxz", Is64Bit ? "jcxz" : "jrcxz")
665 .Case("cmovcl", "cmovbl")
666 .Case("cmovnal", "cmovbel")
667 .Case("cmovnbl", "cmovael")
668 .Case("cmovnbel", "cmoval")
669 .Case("cmovncl", "cmovael")
670 .Case("cmovngl", "cmovlel")
671 .Case("cmovnl", "cmovgel")
672 .Case("cmovngl", "cmovlel")
673 .Case("cmovngel", "cmovll")
674 .Case("cmovnll", "cmovgel")
675 .Case("cmovnlel", "cmovgl")
676 .Case("cmovnzl", "cmovnel")
677 .Case("cmovzl", "cmovel")
678 .Case("fwait", "wait")
679 .Case("movzx", "movzb")
682 // FIXME: Hack to recognize cmp<comparison code>{ss,sd,ps,pd}.
683 const MCExpr *ExtraImmOp = 0;
684 if ((PatchedName.startswith("cmp") || PatchedName.startswith("vcmp")) &&
685 (PatchedName.endswith("ss") || PatchedName.endswith("sd") ||
686 PatchedName.endswith("ps") || PatchedName.endswith("pd"))) {
687 bool IsVCMP = PatchedName.startswith("vcmp");
688 unsigned SSECCIdx = IsVCMP ? 4 : 3;
689 unsigned SSEComparisonCode = StringSwitch<unsigned>(
690 PatchedName.slice(SSECCIdx, PatchedName.size() - 2))
703 .Case("neq_oq", 0x0C)
710 .Case("unord_s", 0x13)
711 .Case("neq_us", 0x14)
712 .Case("nlt_uq", 0x15)
713 .Case("nle_uq", 0x16)
716 .Case("nge_uq", 0x19)
717 .Case("ngt_uq", 0x1A)
718 .Case("false_os", 0x1B)
719 .Case("neq_os", 0x1C)
722 .Case("true_us", 0x1F)
724 if (SSEComparisonCode != ~0U) {
725 ExtraImmOp = MCConstantExpr::Create(SSEComparisonCode,
726 getParser().getContext());
727 if (PatchedName.endswith("ss")) {
728 PatchedName = IsVCMP ? "vcmpss" : "cmpss";
729 } else if (PatchedName.endswith("sd")) {
730 PatchedName = IsVCMP ? "vcmpsd" : "cmpsd";
731 } else if (PatchedName.endswith("ps")) {
732 PatchedName = IsVCMP ? "vcmpps" : "cmpps";
734 assert(PatchedName.endswith("pd") && "Unexpected mnemonic!");
735 PatchedName = IsVCMP ? "vcmppd" : "cmppd";
740 // FIXME: Hack to recognize vpclmul<src1_quadword, src2_quadword>dq
741 if (PatchedName.startswith("vpclmul")) {
742 unsigned CLMULQuadWordSelect = StringSwitch<unsigned>(
743 PatchedName.slice(7, PatchedName.size() - 2))
744 .Case("lqlq", 0x00) // src1[63:0], src2[63:0]
745 .Case("hqlq", 0x01) // src1[127:64], src2[63:0]
746 .Case("lqhq", 0x10) // src1[63:0], src2[127:64]
747 .Case("hqhq", 0x11) // src1[127:64], src2[127:64]
749 if (CLMULQuadWordSelect != ~0U) {
750 ExtraImmOp = MCConstantExpr::Create(CLMULQuadWordSelect,
751 getParser().getContext());
752 assert(PatchedName.endswith("dq") && "Unexpected mnemonic!");
753 PatchedName = "vpclmulqdq";
756 Operands.push_back(X86Operand::CreateToken(PatchedName, NameLoc));
759 Operands.push_back(X86Operand::CreateImm(ExtraImmOp, NameLoc, NameLoc));
762 // This does the actual operand parsing.
763 if (getLexer().isNot(AsmToken::EndOfStatement)) {
765 // Parse '*' modifier.
766 if (getLexer().is(AsmToken::Star)) {
767 SMLoc Loc = Parser.getTok().getLoc();
768 Operands.push_back(X86Operand::CreateToken("*", Loc));
769 Parser.Lex(); // Eat the star.
772 // Read the first operand.
773 if (X86Operand *Op = ParseOperand())
774 Operands.push_back(Op);
778 while (getLexer().is(AsmToken::Comma)) {
779 Parser.Lex(); // Eat the comma.
781 // Parse and remember the operand.
782 if (X86Operand *Op = ParseOperand())
783 Operands.push_back(Op);
789 // FIXME: Hack to handle recognizing s{hr,ar,hl}? $1.
790 if ((Name.startswith("shr") || Name.startswith("sar") ||
791 Name.startswith("shl")) &&
792 Operands.size() == 3) {
793 X86Operand *Op1 = static_cast<X86Operand*>(Operands[1]);
794 if (Op1->isImm() && isa<MCConstantExpr>(Op1->getImm()) &&
795 cast<MCConstantExpr>(Op1->getImm())->getValue() == 1) {
797 Operands.erase(Operands.begin() + 1);
801 // FIXME: Hack to handle "f{mul*,add*,sub*,div*} $op, st(0)" the same as
802 // "f{mul*,add*,sub*,div*} $op"
803 if ((Name.startswith("fmul") || Name.startswith("fadd") ||
804 Name.startswith("fsub") || Name.startswith("fdiv")) &&
805 Operands.size() == 3 &&
806 static_cast<X86Operand*>(Operands[2])->isReg() &&
807 static_cast<X86Operand*>(Operands[2])->getReg() == X86::ST0) {
809 Operands.erase(Operands.begin() + 2);
812 // FIXME: Hack to handle "imul <imm>, B" which is an alias for "imul <imm>, B,
814 if (Name.startswith("imul") && Operands.size() == 3 &&
815 static_cast<X86Operand*>(Operands[1])->isImm() &&
816 static_cast<X86Operand*>(Operands.back())->isReg()) {
817 X86Operand *Op = static_cast<X86Operand*>(Operands.back());
818 Operands.push_back(X86Operand::CreateReg(Op->getReg(), Op->getStartLoc(),
822 // 'sldt <mem>' can be encoded with either sldtw or sldtq with the same
823 // effect (both store to a 16-bit mem). Force to sldtw to avoid ambiguity
824 // errors, since its encoding is the most compact.
825 if (Name == "sldt" && Operands.size() == 2 &&
826 static_cast<X86Operand*>(Operands[1])->isMem())
827 Operands[0] = X86Operand::CreateToken("sldtw", NameLoc);
832 bool X86ATTAsmParser::ParseDirective(AsmToken DirectiveID) {
833 StringRef IDVal = DirectiveID.getIdentifier();
834 if (IDVal == ".word")
835 return ParseDirectiveWord(2, DirectiveID.getLoc());
839 /// ParseDirectiveWord
840 /// ::= .word [ expression (, expression)* ]
841 bool X86ATTAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
842 if (getLexer().isNot(AsmToken::EndOfStatement)) {
845 if (getParser().ParseExpression(Value))
848 getParser().getStreamer().EmitValue(Value, Size, 0 /*addrspace*/);
850 if (getLexer().is(AsmToken::EndOfStatement))
853 // FIXME: Improve diagnostic.
854 if (getLexer().isNot(AsmToken::Comma))
855 return Error(L, "unexpected token in directive");
866 X86ATTAsmParser::MatchInstruction(SMLoc IDLoc,
867 const SmallVectorImpl<MCParsedAsmOperand*>
870 assert(!Operands.empty() && "Unexpect empty operand list!");
872 bool WasOriginallyInvalidOperand = false;
873 unsigned OrigErrorInfo;
875 // First, try a direct match.
876 switch (MatchInstructionImpl(Operands, Inst, OrigErrorInfo)) {
879 case Match_MissingFeature:
880 Error(IDLoc, "instruction requires a CPU feature not currently enabled");
882 case Match_InvalidOperand:
883 WasOriginallyInvalidOperand = true;
885 case Match_MnemonicFail:
889 // FIXME: Ideally, we would only attempt suffix matches for things which are
890 // valid prefixes, and we could just infer the right unambiguous
891 // type. However, that requires substantially more matcher support than the
894 X86Operand *Op = static_cast<X86Operand*>(Operands[0]);
895 assert(Op->isToken() && "Leading operand should always be a mnemonic!");
897 // Change the operand to point to a temporary token.
898 StringRef Base = Op->getToken();
902 Op->setTokenValue(Tmp.str());
904 // Check for the various suffix matches.
905 Tmp[Base.size()] = 'b';
906 unsigned BErrorInfo, WErrorInfo, LErrorInfo, QErrorInfo;
907 MatchResultTy MatchB = MatchInstructionImpl(Operands, Inst, BErrorInfo);
908 Tmp[Base.size()] = 'w';
909 MatchResultTy MatchW = MatchInstructionImpl(Operands, Inst, WErrorInfo);
910 Tmp[Base.size()] = 'l';
911 MatchResultTy MatchL = MatchInstructionImpl(Operands, Inst, LErrorInfo);
912 Tmp[Base.size()] = 'q';
913 MatchResultTy MatchQ = MatchInstructionImpl(Operands, Inst, QErrorInfo);
915 // Restore the old token.
916 Op->setTokenValue(Base);
918 // If exactly one matched, then we treat that as a successful match (and the
919 // instruction will already have been filled in correctly, since the failing
920 // matches won't have modified it).
921 unsigned NumSuccessfulMatches =
922 (MatchB == Match_Success) + (MatchW == Match_Success) +
923 (MatchL == Match_Success) + (MatchQ == Match_Success);
924 if (NumSuccessfulMatches == 1)
927 // Otherwise, the match failed, try to produce a decent error message.
929 // If we had multiple suffix matches, then identify this as an ambiguous
931 if (NumSuccessfulMatches > 1) {
933 unsigned NumMatches = 0;
934 if (MatchB == Match_Success)
935 MatchChars[NumMatches++] = 'b';
936 if (MatchW == Match_Success)
937 MatchChars[NumMatches++] = 'w';
938 if (MatchL == Match_Success)
939 MatchChars[NumMatches++] = 'l';
940 if (MatchQ == Match_Success)
941 MatchChars[NumMatches++] = 'q';
943 SmallString<126> Msg;
944 raw_svector_ostream OS(Msg);
945 OS << "ambiguous instructions require an explicit suffix (could be ";
946 for (unsigned i = 0; i != NumMatches; ++i) {
949 if (i + 1 == NumMatches)
951 OS << "'" << Base << MatchChars[i] << "'";
954 Error(IDLoc, OS.str());
958 // Okay, we know that none of the variants matched successfully.
960 // If all of the instructions reported an invalid mnemonic, then the original
961 // mnemonic was invalid.
962 if ((MatchB == Match_MnemonicFail) && (MatchW == Match_MnemonicFail) &&
963 (MatchL == Match_MnemonicFail) && (MatchQ == Match_MnemonicFail)) {
964 if (!WasOriginallyInvalidOperand) {
965 Error(IDLoc, "invalid instruction mnemonic '" + Base + "'");
969 // Recover location info for the operand if we know which was the problem.
970 SMLoc ErrorLoc = IDLoc;
971 if (OrigErrorInfo != ~0U) {
972 ErrorLoc = ((X86Operand*)Operands[OrigErrorInfo])->getStartLoc();
973 if (ErrorLoc == SMLoc()) ErrorLoc = IDLoc;
976 Error(ErrorLoc, "invalid operand for instruction");
980 // If one instruction matched with a missing feature, report this as a
982 if ((MatchB == Match_MissingFeature) + (MatchW == Match_MissingFeature) +
983 (MatchL == Match_MissingFeature) + (MatchQ == Match_MissingFeature) == 1){
984 Error(IDLoc, "instruction requires a CPU feature not currently enabled");
988 // If one instruction matched with an invalid operand, report this as an
990 if ((MatchB == Match_InvalidOperand) + (MatchW == Match_InvalidOperand) +
991 (MatchL == Match_InvalidOperand) + (MatchQ == Match_InvalidOperand) == 1){
992 Error(IDLoc, "invalid operand for instruction");
996 // If all of these were an outright failure, report it in a useless way.
997 // FIXME: We should give nicer diagnostics about the exact failure.
998 Error(IDLoc, "unknown use of instruction mnemonic without a size suffix");
1003 extern "C" void LLVMInitializeX86AsmLexer();
1005 // Force static initialization.
1006 extern "C" void LLVMInitializeX86AsmParser() {
1007 RegisterAsmParser<X86_32ATTAsmParser> X(TheX86_32Target);
1008 RegisterAsmParser<X86_64ATTAsmParser> Y(TheX86_64Target);
1009 LLVMInitializeX86AsmLexer();
1012 #define GET_REGISTER_MATCHER
1013 #define GET_MATCHER_IMPLEMENTATION
1014 #include "X86GenAsmMatcher.inc"