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ara-mdk / platform / external / llvm / 242cec5be3b3a715de0535d1a074bb4dff94772f / . / lib / Target / X86 / AsmParser / X86AsmParser.cpp
blob: 4ed5534a62ef22acb6f631e688bb2a82e4d64cd8 [file] [log] [blame]
//===-- X86AsmParser.cpp - Parse X86 assembly to MCInst instructions ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/X86BaseInfo.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
struct X86Operand;
class X86AsmParser : public MCTargetAsmParser {
MCSubtargetInfo &STI;
MCAsmParser &Parser;
ParseInstructionInfo *InstInfo;
private:
MCAsmParser &getParser() const { return Parser; }
MCAsmLexer &getLexer() const { return Parser.getLexer(); }
bool Error(SMLoc L, const Twine &Msg,
ArrayRef<SMRange> Ranges = ArrayRef<SMRange>(),
bool MatchingInlineAsm = false) {
if (MatchingInlineAsm) return true;
return Parser.Error(L, Msg, Ranges);
}
X86Operand *ErrorOperand(SMLoc Loc, StringRef Msg) {
Error(Loc, Msg);
return 0;
}
X86Operand *ParseOperand();
X86Operand *ParseATTOperand();
X86Operand *ParseIntelOperand();
X86Operand *ParseIntelOffsetOfOperator(SMLoc StartLoc);
X86Operand *ParseIntelOperator(SMLoc StartLoc, unsigned OpKind);
X86Operand *ParseIntelMemOperand(unsigned SegReg, SMLoc StartLoc);
X86Operand *ParseIntelBracExpression(unsigned SegReg, unsigned Size);
X86Operand *ParseMemOperand(unsigned SegReg, SMLoc StartLoc);
bool ParseIntelDotOperator(const MCExpr *Disp, const MCExpr **NewDisp,
SmallString<64> &Err);
bool ParseDirectiveWord(unsigned Size, SMLoc L);
bool ParseDirectiveCode(StringRef IDVal, SMLoc L);
bool processInstruction(MCInst &Inst,
const SmallVectorImpl<MCParsedAsmOperand*> &Ops);
bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
SmallVectorImpl<MCParsedAsmOperand*> &Operands,
MCStreamer &Out, unsigned &ErrorInfo,
bool MatchingInlineAsm);
/// isSrcOp - Returns true if operand is either (%rsi) or %ds:%(rsi)
/// in 64bit mode or (%esi) or %es:(%esi) in 32bit mode.
bool isSrcOp(X86Operand &Op);
/// isDstOp - Returns true if operand is either (%rdi) or %es:(%rdi)
/// in 64bit mode or (%edi) or %es:(%edi) in 32bit mode.
bool isDstOp(X86Operand &Op);
bool is64BitMode() const {
// FIXME: Can tablegen auto-generate this?
return (STI.getFeatureBits() & X86::Mode64Bit) != 0;
}
void SwitchMode() {
unsigned FB = ComputeAvailableFeatures(STI.ToggleFeature(X86::Mode64Bit));
setAvailableFeatures(FB);
}
/// @name Auto-generated Matcher Functions
/// {
#define GET_ASSEMBLER_HEADER
#include "X86GenAsmMatcher.inc"
/// }
public:
X86AsmParser(MCSubtargetInfo &sti, MCAsmParser &parser)
: MCTargetAsmParser(), STI(sti), Parser(parser), InstInfo(0) {
// Initialize the set of available features.
setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
}
virtual bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc);
virtual bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
SMLoc NameLoc,
SmallVectorImpl<MCParsedAsmOperand*> &Operands);
virtual bool ParseDirective(AsmToken DirectiveID);
bool isParsingIntelSyntax() {
return getParser().getAssemblerDialect();
}
};
} // end anonymous namespace
/// @name Auto-generated Match Functions
/// {
static unsigned MatchRegisterName(StringRef Name);
/// }
static bool isImmSExti16i8Value(uint64_t Value) {
return (( Value <= 0x000000000000007FULL)||
(0x000000000000FF80ULL <= Value && Value <= 0x000000000000FFFFULL)||
(0xFFFFFFFFFFFFFF80ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
}
static bool isImmSExti32i8Value(uint64_t Value) {
return (( Value <= 0x000000000000007FULL)||
(0x00000000FFFFFF80ULL <= Value && Value <= 0x00000000FFFFFFFFULL)||
(0xFFFFFFFFFFFFFF80ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
}
static bool isImmZExtu32u8Value(uint64_t Value) {
return (Value <= 0x00000000000000FFULL);
}
static bool isImmSExti64i8Value(uint64_t Value) {
return (( Value <= 0x000000000000007FULL)||
(0xFFFFFFFFFFFFFF80ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
}
static bool isImmSExti64i32Value(uint64_t Value) {
return (( Value <= 0x000000007FFFFFFFULL)||
(0xFFFFFFFF80000000ULL <= Value && Value <= 0xFFFFFFFFFFFFFFFFULL));
}
namespace {
/// X86Operand - Instances of this class represent a parsed X86 machine
/// instruction.
struct X86Operand : public MCParsedAsmOperand {
enum KindTy {
Token,
Register,
Immediate,
Memory
} Kind;
SMLoc StartLoc, EndLoc;
SMLoc OffsetOfLoc;
bool AddressOf;
struct TokOp {
const char *Data;
unsigned Length;
};
struct RegOp {
unsigned RegNo;
};
struct ImmOp {
const MCExpr *Val;
bool NeedAsmRewrite;
};
struct MemOp {
unsigned SegReg;
const MCExpr *Disp;
unsigned BaseReg;
unsigned IndexReg;
unsigned Scale;
unsigned Size;
bool NeedSizeDir;
};
union {
struct TokOp Tok;
struct RegOp Reg;
struct ImmOp Imm;
struct MemOp Mem;
};
X86Operand(KindTy K, SMLoc Start, SMLoc End)
: Kind(K), StartLoc(Start), EndLoc(End) {}
/// getStartLoc - Get the location of the first token of this operand.
SMLoc getStartLoc() const { return StartLoc; }
/// getEndLoc - Get the location of the last token of this operand.
SMLoc getEndLoc() const { return EndLoc; }
/// getLocRange - Get the range between the first and last token of this
/// operand.
SMRange getLocRange() const { return SMRange(StartLoc, EndLoc); }
/// getOffsetOfLoc - Get the location of the offset operator.
SMLoc getOffsetOfLoc() const { return OffsetOfLoc; }
virtual void print(raw_ostream &OS) const {}
StringRef getToken() const {
assert(Kind == Token && "Invalid access!");
return StringRef(Tok.Data, Tok.Length);
}
void setTokenValue(StringRef Value) {
assert(Kind == Token && "Invalid access!");
Tok.Data = Value.data();
Tok.Length = Value.size();
}
unsigned getReg() const {
assert(Kind == Register && "Invalid access!");
return Reg.RegNo;
}
const MCExpr *getImm() const {
assert(Kind == Immediate && "Invalid access!");
return Imm.Val;
}
bool needAsmRewrite() const {
assert(Kind == Immediate && "Invalid access!");
return Imm.NeedAsmRewrite;
}
const MCExpr *getMemDisp() const {
assert(Kind == Memory && "Invalid access!");
return Mem.Disp;
}
unsigned getMemSegReg() const {
assert(Kind == Memory && "Invalid access!");
return Mem.SegReg;
}
unsigned getMemBaseReg() const {
assert(Kind == Memory && "Invalid access!");
return Mem.BaseReg;
}
unsigned getMemIndexReg() const {
assert(Kind == Memory && "Invalid access!");
return Mem.IndexReg;
}
unsigned getMemScale() const {
assert(Kind == Memory && "Invalid access!");
return Mem.Scale;
}
bool isToken() const {return Kind == Token; }
bool isImm() const { return Kind == Immediate; }
bool isImmSExti16i8() const {
if (!isImm())
return false;
// If this isn't a constant expr, just assume it fits and let relaxation
// handle it.
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE)
return true;
// Otherwise, check the value is in a range that makes sense for this
// extension.
return isImmSExti16i8Value(CE->getValue());
}
bool isImmSExti32i8() const {
if (!isImm())
return false;
// If this isn't a constant expr, just assume it fits and let relaxation
// handle it.
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE)
return true;
// Otherwise, check the value is in a range that makes sense for this
// extension.
return isImmSExti32i8Value(CE->getValue());
}
bool isImmZExtu32u8() const {
if (!isImm())
return false;
// If this isn't a constant expr, just assume it fits and let relaxation
// handle it.
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE)
return true;
// Otherwise, check the value is in a range that makes sense for this
// extension.
return isImmZExtu32u8Value(CE->getValue());
}
bool isImmSExti64i8() const {
if (!isImm())
return false;
// If this isn't a constant expr, just assume it fits and let relaxation
// handle it.
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE)
return true;
// Otherwise, check the value is in a range that makes sense for this
// extension.
return isImmSExti64i8Value(CE->getValue());
}
bool isImmSExti64i32() const {
if (!isImm())
return false;
// If this isn't a constant expr, just assume it fits and let relaxation
// handle it.
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE)
return true;
// Otherwise, check the value is in a range that makes sense for this
// extension.
return isImmSExti64i32Value(CE->getValue());
}
unsigned getMemSize() const {
assert(Kind == Memory && "Invalid access!");
return Mem.Size;
}
bool isOffsetOf() const {
return OffsetOfLoc.getPointer();
}
bool needAddressOf() const {
return AddressOf;
}
bool needSizeDirective() const {
assert(Kind == Memory && "Invalid access!");
return Mem.NeedSizeDir;
}
bool isMem() const { return Kind == Memory; }
bool isMem8() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 8);
}
bool isMem16() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 16);
}
bool isMem32() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 32);
}
bool isMem64() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 64);
}
bool isMem80() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 80);
}
bool isMem128() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 128);
}
bool isMem256() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 256);
}
bool isMemVX32() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 32) &&
getMemIndexReg() >= X86::XMM0 && getMemIndexReg() <= X86::XMM15;
}
bool isMemVY32() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 32) &&
getMemIndexReg() >= X86::YMM0 && getMemIndexReg() <= X86::YMM15;
}
bool isMemVX64() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 64) &&
getMemIndexReg() >= X86::XMM0 && getMemIndexReg() <= X86::XMM15;
}
bool isMemVY64() const {
return Kind == Memory && (!Mem.Size || Mem.Size == 64) &&
getMemIndexReg() >= X86::YMM0 && getMemIndexReg() <= X86::YMM15;
}
bool isAbsMem() const {
return Kind == Memory && !getMemSegReg() && !getMemBaseReg() &&
!getMemIndexReg() && getMemScale() == 1;
}
bool isReg() const { return Kind == Register; }
void addExpr(MCInst &Inst, const MCExpr *Expr) const {
// Add as immediates when possible.
if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
else
Inst.addOperand(MCOperand::CreateExpr(Expr));
}
void addRegOperands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
Inst.addOperand(MCOperand::CreateReg(getReg()));
}
void addImmOperands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
addExpr(Inst, getImm());
}
void addMem8Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMem16Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMem32Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMem64Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMem80Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMem128Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMem256Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMemVX32Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMemVY32Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMemVX64Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMemVY64Operands(MCInst &Inst, unsigned N) const {
addMemOperands(Inst, N);
}
void addMemOperands(MCInst &Inst, unsigned N) const {
assert((N == 5) && "Invalid number of operands!");
Inst.addOperand(MCOperand::CreateReg(getMemBaseReg()));
Inst.addOperand(MCOperand::CreateImm(getMemScale()));
Inst.addOperand(MCOperand::CreateReg(getMemIndexReg()));
addExpr(Inst, getMemDisp());
Inst.addOperand(MCOperand::CreateReg(getMemSegReg()));
}
void addAbsMemOperands(MCInst &Inst, unsigned N) const {
assert((N == 1) && "Invalid number of operands!");
// Add as immediates when possible.
if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getMemDisp()))
Inst.addOperand(MCOperand::CreateImm(CE->getValue()));
else
Inst.addOperand(MCOperand::CreateExpr(getMemDisp()));
}
static X86Operand *CreateToken(StringRef Str, SMLoc Loc) {
SMLoc EndLoc = SMLoc::getFromPointer(Loc.getPointer() + Str.size());
X86Operand *Res = new X86Operand(Token, Loc, EndLoc);
Res->Tok.Data = Str.data();
Res->Tok.Length = Str.size();
return Res;
}
static X86Operand *CreateReg(unsigned RegNo, SMLoc StartLoc, SMLoc EndLoc,
bool AddressOf = false,
SMLoc OffsetOfLoc = SMLoc()) {
X86Operand *Res = new X86Operand(Register, StartLoc, EndLoc);
Res->Reg.RegNo = RegNo;
Res->AddressOf = AddressOf;
Res->OffsetOfLoc = OffsetOfLoc;
return Res;
}
static X86Operand *CreateImm(const MCExpr *Val, SMLoc StartLoc, SMLoc EndLoc,
bool NeedRewrite = true){
X86Operand *Res = new X86Operand(Immediate, StartLoc, EndLoc);
Res->Imm.Val = Val;
Res->Imm.NeedAsmRewrite = NeedRewrite;
return Res;
}
/// Create an absolute memory operand.
static X86Operand *CreateMem(const MCExpr *Disp, SMLoc StartLoc, SMLoc EndLoc,
unsigned Size = 0, bool NeedSizeDir = false) {
X86Operand *Res = new X86Operand(Memory, StartLoc, EndLoc);
Res->Mem.SegReg = 0;
Res->Mem.Disp = Disp;
Res->Mem.BaseReg = 0;
Res->Mem.IndexReg = 0;
Res->Mem.Scale = 1;
Res->Mem.Size = Size;
Res->Mem.NeedSizeDir = NeedSizeDir;
Res->AddressOf = false;
return Res;
}
/// Create a generalized memory operand.
static X86Operand *CreateMem(unsigned SegReg, const MCExpr *Disp,
unsigned BaseReg, unsigned IndexReg,
unsigned Scale, SMLoc StartLoc, SMLoc EndLoc,
unsigned Size = 0, bool NeedSizeDir = false) {
// We should never just have a displacement, that should be parsed as an
// absolute memory operand.
assert((SegReg || BaseReg || IndexReg) && "Invalid memory operand!");
// The scale should always be one of {1,2,4,8}.
assert(((Scale == 1 || Scale == 2 || Scale == 4 || Scale == 8)) &&
"Invalid scale!");
X86Operand *Res = new X86Operand(Memory, StartLoc, EndLoc);
Res->Mem.SegReg = SegReg;
Res->Mem.Disp = Disp;
Res->Mem.BaseReg = BaseReg;
Res->Mem.IndexReg = IndexReg;
Res->Mem.Scale = Scale;
Res->Mem.Size = Size;
Res->Mem.NeedSizeDir = NeedSizeDir;
Res->AddressOf = false;
return Res;
}
};
} // end anonymous namespace.
bool X86AsmParser::isSrcOp(X86Operand &Op) {
unsigned basereg = is64BitMode() ? X86::RSI : X86::ESI;
return (Op.isMem() &&
(Op.Mem.SegReg == 0 || Op.Mem.SegReg == X86::DS) &&
isa<MCConstantExpr>(Op.Mem.Disp) &&
cast<MCConstantExpr>(Op.Mem.Disp)->getValue() == 0 &&
Op.Mem.BaseReg == basereg && Op.Mem.IndexReg == 0);
}
bool X86AsmParser::isDstOp(X86Operand &Op) {
unsigned basereg = is64BitMode() ? X86::RDI : X86::EDI;
return Op.isMem() &&
(Op.Mem.SegReg == 0 || Op.Mem.SegReg == X86::ES) &&
isa<MCConstantExpr>(Op.Mem.Disp) &&
cast<MCConstantExpr>(Op.Mem.Disp)->getValue() == 0 &&
Op.Mem.BaseReg == basereg && Op.Mem.IndexReg == 0;
}
bool X86AsmParser::ParseRegister(unsigned &RegNo,
SMLoc &StartLoc, SMLoc &EndLoc) {
RegNo = 0;
const AsmToken &PercentTok = Parser.getTok();
StartLoc = PercentTok.getLoc();
// If we encounter a %, ignore it. This code handles registers with and
// without the prefix, unprefixed registers can occur in cfi directives.
if (!isParsingIntelSyntax() && PercentTok.is(AsmToken::Percent))
Parser.Lex(); // Eat percent token.
const AsmToken &Tok = Parser.getTok();
EndLoc = Tok.getEndLoc();
if (Tok.isNot(AsmToken::Identifier)) {
if (isParsingIntelSyntax()) return true;
return Error(StartLoc, "invalid register name",
SMRange(StartLoc, EndLoc));
}
RegNo = MatchRegisterName(Tok.getString());
// If the match failed, try the register name as lowercase.
if (RegNo == 0)
RegNo = MatchRegisterName(Tok.getString().lower());
if (!is64BitMode()) {
// FIXME: This should be done using Requires<In32BitMode> and
// Requires<In64BitMode> so "eiz" usage in 64-bit instructions can be also
// checked.
// FIXME: Check AH, CH, DH, BH cannot be used in an instruction requiring a
// REX prefix.
if (RegNo == X86::RIZ ||
X86MCRegisterClasses[X86::GR64RegClassID].contains(RegNo) ||
X86II::isX86_64NonExtLowByteReg(RegNo) ||
X86II::isX86_64ExtendedReg(RegNo))
return Error(StartLoc, "register %"
+ Tok.getString() + " is only available in 64-bit mode",
SMRange(StartLoc, EndLoc));
}
// Parse "%st" as "%st(0)" and "%st(1)", which is multiple tokens.
if (RegNo == 0 && (Tok.getString() == "st" || Tok.getString() == "ST")) {
RegNo = X86::ST0;
Parser.Lex(); // Eat 'st'
// Check to see if we have '(4)' after %st.
if (getLexer().isNot(AsmToken::LParen))
return false;
// Lex the paren.
getParser().Lex();
const AsmToken &IntTok = Parser.getTok();
if (IntTok.isNot(AsmToken::Integer))
return Error(IntTok.getLoc(), "expected stack index");
switch (IntTok.getIntVal()) {
case 0: RegNo = X86::ST0; break;
case 1: RegNo = X86::ST1; break;
case 2: RegNo = X86::ST2; break;
case 3: RegNo = X86::ST3; break;
case 4: RegNo = X86::ST4; break;
case 5: RegNo = X86::ST5; break;
case 6: RegNo = X86::ST6; break;
case 7: RegNo = X86::ST7; break;
default: return Error(IntTok.getLoc(), "invalid stack index");
}
if (getParser().Lex().isNot(AsmToken::RParen))
return Error(Parser.getTok().getLoc(), "expected ')'");
EndLoc = Parser.getTok().getEndLoc();
Parser.Lex(); // Eat ')'
return false;
}
EndLoc = Parser.getTok().getEndLoc();
// If this is "db[0-7]", match it as an alias
// for dr[0-7].
if (RegNo == 0 && Tok.getString().size() == 3 &&
Tok.getString().startswith("db")) {
switch (Tok.getString()[2]) {
case '0': RegNo = X86::DR0; break;
case '1': RegNo = X86::DR1; break;
case '2': RegNo = X86::DR2; break;
case '3': RegNo = X86::DR3; break;
case '4': RegNo = X86::DR4; break;
case '5': RegNo = X86::DR5; break;
case '6': RegNo = X86::DR6; break;
case '7': RegNo = X86::DR7; break;
}
if (RegNo != 0) {
EndLoc = Parser.getTok().getEndLoc();
Parser.Lex(); // Eat it.
return false;
}
}
if (RegNo == 0) {
if (isParsingIntelSyntax()) return true;
return Error(StartLoc, "invalid register name",
SMRange(StartLoc, EndLoc));
}
Parser.Lex(); // Eat identifier token.
return false;
}
X86Operand *X86AsmParser::ParseOperand() {
if (isParsingIntelSyntax())
return ParseIntelOperand();
return ParseATTOperand();
}
/// getIntelMemOperandSize - Return intel memory operand size.
static unsigned getIntelMemOperandSize(StringRef OpStr) {
unsigned Size = StringSwitch<unsigned>(OpStr)
.Cases("BYTE", "byte", 8)
.Cases("WORD", "word", 16)
.Cases("DWORD", "dword", 32)
.Cases("QWORD", "qword", 64)
.Cases("XWORD", "xword", 80)
.Cases("XMMWORD", "xmmword", 128)
.Cases("YMMWORD", "ymmword", 256)
.Default(0);
return Size;
}
enum IntelBracExprState {
IBES_START,
IBES_LBRAC,
IBES_RBRAC,
IBES_REGISTER,
IBES_REGISTER_STAR,
IBES_REGISTER_STAR_INTEGER,
IBES_INTEGER,
IBES_INTEGER_STAR,
IBES_INDEX_REGISTER,
IBES_IDENTIFIER,
IBES_DISP_EXPR,
IBES_MINUS,
IBES_ERROR
};
class IntelBracExprStateMachine {
IntelBracExprState State;
unsigned BaseReg, IndexReg, Scale;
int64_t Disp;
unsigned TmpReg;
int64_t TmpInteger;
bool isPlus;
public:
IntelBracExprStateMachine(MCAsmParser &parser) :
State(IBES_START), BaseReg(0), IndexReg(0), Scale(1), Disp(0),
TmpReg(0), TmpInteger(0), isPlus(true) {}
unsigned getBaseReg() { return BaseReg; }
unsigned getIndexReg() { return IndexReg; }
unsigned getScale() { return Scale; }
int64_t getDisp() { return Disp; }
bool isValidEndState() { return State == IBES_RBRAC; }
void onPlus() {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_INTEGER:
State = IBES_START;
if (isPlus)
Disp += TmpInteger;
else
Disp -= TmpInteger;
break;
case IBES_REGISTER:
State = IBES_START;
// If we already have a BaseReg, then assume this is the IndexReg with a
// scale of 1.
if (!BaseReg) {
BaseReg = TmpReg;
} else {
assert (!IndexReg && "BaseReg/IndexReg already set!");
IndexReg = TmpReg;
Scale = 1;
}
break;
case IBES_INDEX_REGISTER:
State = IBES_START;
break;
}
isPlus = true;
}
void onMinus() {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_START:
State = IBES_MINUS;
break;
case IBES_INTEGER:
State = IBES_START;
if (isPlus)
Disp += TmpInteger;
else
Disp -= TmpInteger;
break;
case IBES_REGISTER:
State = IBES_START;
// If we already have a BaseReg, then assume this is the IndexReg with a
// scale of 1.
if (!BaseReg) {
BaseReg = TmpReg;
} else {
assert (!IndexReg && "BaseReg/IndexReg already set!");
IndexReg = TmpReg;
Scale = 1;
}
break;
case IBES_INDEX_REGISTER:
State = IBES_START;
break;
}
isPlus = false;
}
void onRegister(unsigned Reg) {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_START:
State = IBES_REGISTER;
TmpReg = Reg;
break;
case IBES_INTEGER_STAR:
assert (!IndexReg && "IndexReg already set!");
State = IBES_INDEX_REGISTER;
IndexReg = Reg;
Scale = TmpInteger;
break;
}
}
void onDispExpr() {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_START:
State = IBES_DISP_EXPR;
break;
}
}
void onInteger(int64_t TmpInt) {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_START:
State = IBES_INTEGER;
TmpInteger = TmpInt;
break;
case IBES_MINUS:
State = IBES_INTEGER;
TmpInteger = TmpInt;
break;
case IBES_REGISTER_STAR:
assert (!IndexReg && "IndexReg already set!");
State = IBES_INDEX_REGISTER;
IndexReg = TmpReg;
Scale = TmpInt;
break;
}
}
void onStar() {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_INTEGER:
State = IBES_INTEGER_STAR;
break;
case IBES_REGISTER:
State = IBES_REGISTER_STAR;
break;
}
}
void onLBrac() {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_RBRAC:
State = IBES_START;
isPlus = true;
break;
}
}
void onRBrac() {
switch (State) {
default:
State = IBES_ERROR;
break;
case IBES_DISP_EXPR:
State = IBES_RBRAC;
break;
case IBES_INTEGER:
State = IBES_RBRAC;
if (isPlus)
Disp += TmpInteger;
else
Disp -= TmpInteger;
break;
case IBES_REGISTER:
State = IBES_RBRAC;
// If we already have a BaseReg, then assume this is the IndexReg with a
// scale of 1.
if (!BaseReg) {
BaseReg = TmpReg;
} else {
assert (!IndexReg && "BaseReg/IndexReg already set!");
IndexReg = TmpReg;
Scale = 1;
}
break;
case IBES_INDEX_REGISTER:
State = IBES_RBRAC;
break;
}
}
};
X86Operand *X86AsmParser::ParseIntelBracExpression(unsigned SegReg,
unsigned Size) {
const AsmToken &Tok = Parser.getTok();
SMLoc Start = Tok.getLoc(), End = Tok.getEndLoc();
// Eat '['
if (getLexer().isNot(AsmToken::LBrac))
return ErrorOperand(Start, "Expected '[' token!");
Parser.Lex();
unsigned TmpReg = 0;
// Try to handle '[' 'symbol' ']'
if (getLexer().is(AsmToken::Identifier)) {
if (ParseRegister(TmpReg, Start, End)) {
const MCExpr *Disp;
if (getParser().parseExpression(Disp, End))
return 0;
if (getLexer().isNot(AsmToken::RBrac))
return ErrorOperand(Parser.getTok().getLoc(), "Expected ']' token!");
// Adjust the EndLoc due to the ']'.
End = SMLoc::getFromPointer(Parser.getTok().getEndLoc().getPointer()-1);
Parser.Lex();
return X86Operand::CreateMem(Disp, Start, End, Size);
}
}
// Parse [ BaseReg + Scale*IndexReg + Disp ].
bool Done = false;
IntelBracExprStateMachine SM(Parser);
// If we parsed a register, then the end loc has already been set and
// the identifier has already been lexed. We also need to update the
// state.
if (TmpReg)
SM.onRegister(TmpReg);
const MCExpr *Disp = 0;
while (!Done) {
bool UpdateLocLex = true;
// The period in the dot operator (e.g., [ebx].foo.bar) is parsed as an
// identifier. Don't try an parse it as a register.
if (Tok.getString().startswith("."))
break;
switch (getLexer().getKind()) {
default: {
if (SM.isValidEndState()) {
Done = true;
break;
}
return ErrorOperand(Tok.getLoc(), "Unexpected token!");
}
case AsmToken::Identifier: {
// This could be a register or a displacement expression.
if(!ParseRegister(TmpReg, Start, End)) {
SM.onRegister(TmpReg);
UpdateLocLex = false;
break;
} else if (!getParser().parseExpression(Disp, End)) {
SM.onDispExpr();
UpdateLocLex = false;
break;
}
return ErrorOperand(Tok.getLoc(), "Unexpected identifier!");
}
case AsmToken::Integer: {
int64_t Val = Tok.getIntVal();
SM.onInteger(Val);
break;
}
case AsmToken::Plus: SM.onPlus(); break;
case AsmToken::Minus: SM.onMinus(); break;
case AsmToken::Star: SM.onStar(); break;
case AsmToken::LBrac: SM.onLBrac(); break;
case AsmToken::RBrac: SM.onRBrac(); break;
}
if (!Done && UpdateLocLex) {
End = Tok.getLoc();
Parser.Lex(); // Consume the token.
}
}
if (!Disp)
Disp = MCConstantExpr::Create(SM.getDisp(), getContext());
// Parse the dot operator (e.g., [ebx].foo.bar).
if (Tok.getString().startswith(".")) {
SmallString<64> Err;
const MCExpr *NewDisp;
if (ParseIntelDotOperator(Disp, &NewDisp, Err))
return ErrorOperand(Tok.getLoc(), Err);
End = Parser.getTok().getEndLoc();
Parser.Lex(); // Eat the field.
Disp = NewDisp;
}
int BaseReg = SM.getBaseReg();
int IndexReg = SM.getIndexReg();
// handle [-42]
if (!BaseReg && !IndexReg) {
if (!SegReg)
return X86Operand::CreateMem(Disp, Start, End);
else
return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, Start, End, Size);
}
int Scale = SM.getScale();
return X86Operand::CreateMem(SegReg, Disp, BaseReg, IndexReg, Scale,
Start, End, Size);
}
/// ParseIntelMemOperand - Parse intel style memory operand.
X86Operand *X86AsmParser::ParseIntelMemOperand(unsigned SegReg, SMLoc Start) {
const AsmToken &Tok = Parser.getTok();
SMLoc End;
unsigned Size = getIntelMemOperandSize(Tok.getString());
if (Size) {
Parser.Lex();
assert ((Tok.getString() == "PTR" || Tok.getString() == "ptr") &&
"Unexpected token!");
Parser.Lex();
}
if (getLexer().is(AsmToken::LBrac))
return ParseIntelBracExpression(SegReg, Size);
if (!ParseRegister(SegReg, Start, End)) {
// Handel SegReg : [ ... ]
if (getLexer().isNot(AsmToken::Colon))
return ErrorOperand(Start, "Expected ':' token!");
Parser.Lex(); // Eat :
if (getLexer().isNot(AsmToken::LBrac))
return ErrorOperand(Start, "Expected '[' token!");
return ParseIntelBracExpression(SegReg, Size);
}
const MCExpr *Disp = MCConstantExpr::Create(0, getParser().getContext());
if (getParser().parseExpression(Disp, End))
return 0;
bool NeedSizeDir = false;
bool IsVarDecl = false;
if (isParsingInlineAsm()) {
if (const MCSymbolRefExpr *SymRef = dyn_cast<MCSymbolRefExpr>(Disp)) {
const MCSymbol &Sym = SymRef->getSymbol();
// FIXME: The SemaLookup will fail if the name is anything other then an
// identifier.
// FIXME: Pass a valid SMLoc.
unsigned tLength, tSize, tType;
SemaCallback->LookupInlineAsmIdentifier(Sym.getName(), NULL, tLength,
tSize, tType, IsVarDecl);
if (!Size)
Size = tType * 8; // Size is in terms of bits in this context.
NeedSizeDir = Size > 0;
}
}
if (!isParsingInlineAsm())
return X86Operand::CreateMem(Disp, Start, End, Size);
else {
// If this is not a VarDecl then assume it is a FuncDecl or some other label
// reference. We need an 'r' constraint here, so we need to create register
// operand to ensure proper matching. Just pick a GPR based on the size of
// a pointer.
if (!IsVarDecl) {
unsigned RegNo = is64BitMode() ? X86::RBX : X86::EBX;
return X86Operand::CreateReg(RegNo, Start, End, /*AddressOf=*/true);
}
// When parsing inline assembly we set the base register to a non-zero value
// as we don't know the actual value at this time. This is necessary to
// get the matching correct in some cases.
return X86Operand::CreateMem(/*SegReg*/0, Disp, /*BaseReg*/1, /*IndexReg*/0,
/*Scale*/1, Start, End, Size, NeedSizeDir);
}
}
/// Parse the '.' operator.
bool X86AsmParser::ParseIntelDotOperator(const MCExpr *Disp,
const MCExpr **NewDisp,
SmallString<64> &Err) {
AsmToken Tok = *&Parser.getTok();
uint64_t OrigDispVal, DotDispVal;
// FIXME: Handle non-constant expressions.
if (const MCConstantExpr *OrigDisp = dyn_cast<MCConstantExpr>(Disp)) {
OrigDispVal = OrigDisp->getValue();
} else {
Err = "Non-constant offsets are not supported!";
return true;
}
// Drop the '.'.
StringRef DotDispStr = Tok.getString().drop_front(1);
// .Imm gets lexed as a real.
if (Tok.is(AsmToken::Real)) {
APInt DotDisp;
DotDispStr.getAsInteger(10, DotDisp);
DotDispVal = DotDisp.getZExtValue();
} else if (Tok.is(AsmToken::Identifier)) {
// We should only see an identifier when parsing the original inline asm.
// The front-end should rewrite this in terms of immediates.
assert (isParsingInlineAsm() && "Unexpected field name!");
unsigned DotDisp;
std::pair<StringRef, StringRef> BaseMember = DotDispStr.split('.');
if (SemaCallback->LookupInlineAsmField(BaseMember.first, BaseMember.second,
DotDisp)) {
Err = "Unable to lookup field reference!";
return true;
}
DotDispVal = DotDisp;
} else {
Err = "Unexpected token type!";
return true;
}
if (isParsingInlineAsm() && Tok.is(AsmToken::Identifier)) {
SMLoc Loc = SMLoc::getFromPointer(DotDispStr.data());
unsigned Len = DotDispStr.size();
unsigned Val = OrigDispVal + DotDispVal;
InstInfo->AsmRewrites->push_back(AsmRewrite(AOK_DotOperator, Loc, Len,
Val));
}
*NewDisp = MCConstantExpr::Create(OrigDispVal + DotDispVal, getContext());
return false;
}
/// Parse the 'offset' operator. This operator is used to specify the
/// location rather then the content of a variable.
X86Operand *X86AsmParser::ParseIntelOffsetOfOperator(SMLoc Start) {
SMLoc OffsetOfLoc = Start;
Parser.Lex(); // Eat offset.
Start = Parser.getTok().getLoc();
assert (Parser.getTok().is(AsmToken::Identifier) && "Expected an identifier");
SMLoc End;
const MCExpr *Val;
if (getParser().parseExpression(Val, End))
return ErrorOperand(Start, "Unable to parse expression!");
// Don't emit the offset operator.
InstInfo->AsmRewrites->push_back(AsmRewrite(AOK_Skip, OffsetOfLoc, 7));
// The offset operator will have an 'r' constraint, thus we need to create
// register operand to ensure proper matching. Just pick a GPR based on
// the size of a pointer.
unsigned RegNo = is64BitMode() ? X86::RBX : X86::EBX;
return X86Operand::CreateReg(RegNo, Start, End, /*GetAddress=*/true,
OffsetOfLoc);
}
enum IntelOperatorKind {
IOK_LENGTH,
IOK_SIZE,
IOK_TYPE
};
/// Parse the 'LENGTH', 'TYPE' and 'SIZE' operators. The LENGTH operator
/// returns the number of elements in an array. It returns the value 1 for
/// non-array variables. The SIZE operator returns the size of a C or C++
/// variable. A variable's size is the product of its LENGTH and TYPE. The
/// TYPE operator returns the size of a C or C++ type or variable. If the
/// variable is an array, TYPE returns the size of a single element.
X86Operand *X86AsmParser::ParseIntelOperator(SMLoc Start, unsigned OpKind) {
SMLoc TypeLoc = Start;
Parser.Lex(); // Eat offset.
Start = Parser.getTok().getLoc();
assert (Parser.getTok().is(AsmToken::Identifier) && "Expected an identifier");
SMLoc End;
const MCExpr *Val;
if (getParser().parseExpression(Val, End))
return 0;
unsigned Length = 0, Size = 0, Type = 0;
if (const MCSymbolRefExpr *SymRef = dyn_cast<MCSymbolRefExpr>(Val)) {
const MCSymbol &Sym = SymRef->getSymbol();
// FIXME: The SemaLookup will fail if the name is anything other then an
// identifier.
// FIXME: Pass a valid SMLoc.
bool IsVarDecl;
if (!SemaCallback->LookupInlineAsmIdentifier(Sym.getName(), NULL, Length,
Size, Type, IsVarDecl))
return ErrorOperand(Start, "Unable to lookup expr!");
}
unsigned CVal;
switch(OpKind) {
default: llvm_unreachable("Unexpected operand kind!");
case IOK_LENGTH: CVal = Length; break;
case IOK_SIZE: CVal = Size; break;
case IOK_TYPE: CVal = Type; break;
}
// Rewrite the type operator and the C or C++ type or variable in terms of an
// immediate. E.g. TYPE foo -> $$4
unsigned Len = End.getPointer() - TypeLoc.getPointer();
InstInfo->AsmRewrites->push_back(AsmRewrite(AOK_Imm, TypeLoc, Len, CVal));
const MCExpr *Imm = MCConstantExpr::Create(CVal, getContext());
return X86Operand::CreateImm(Imm, Start, End, /*NeedAsmRewrite*/false);
}
X86Operand *X86AsmParser::ParseIntelOperand() {
SMLoc Start = Parser.getTok().getLoc(), End;
StringRef AsmTokStr = Parser.getTok().getString();
// Offset, length, type and size operators.
if (isParsingInlineAsm()) {
if (AsmTokStr == "offset" || AsmTokStr == "OFFSET")
return ParseIntelOffsetOfOperator(Start);
if (AsmTokStr == "length" || AsmTokStr == "LENGTH")
return ParseIntelOperator(Start, IOK_LENGTH);
if (AsmTokStr == "size" || AsmTokStr == "SIZE")
return ParseIntelOperator(Start, IOK_SIZE);
if (AsmTokStr == "type" || AsmTokStr == "TYPE")
return ParseIntelOperator(Start, IOK_TYPE);
}
// Immediate.
if (getLexer().is(AsmToken::Integer) || getLexer().is(AsmToken::Real) ||
getLexer().is(AsmToken::Minus)) {
const MCExpr *Val;
if (!getParser().parseExpression(Val, End)) {
return X86Operand::CreateImm(Val, Start, End);
}
}
// Register.
unsigned RegNo = 0;
if (!ParseRegister(RegNo, Start, End)) {
// If this is a segment register followed by a ':', then this is the start
// of a memory reference, otherwise this is a normal register reference.
if (getLexer().isNot(AsmToken::Colon))
return X86Operand::CreateReg(RegNo, Start, End);
getParser().Lex(); // Eat the colon.
return ParseIntelMemOperand(RegNo, Start);
}
// Memory operand.
return ParseIntelMemOperand(0, Start);
}
X86Operand *X86AsmParser::ParseATTOperand() {
switch (getLexer().getKind()) {
default:
// Parse a memory operand with no segment register.
return ParseMemOperand(0, Parser.getTok().getLoc());
case AsmToken::Percent: {
// Read the register.
unsigned RegNo;
SMLoc Start, End;
if (ParseRegister(RegNo, Start, End)) return 0;
if (RegNo == X86::EIZ || RegNo == X86::RIZ) {
Error(Start, "%eiz and %riz can only be used as index registers",
SMRange(Start, End));
return 0;
}
// If this is a segment register followed by a ':', then this is the start
// of a memory reference, otherwise this is a normal register reference.
if (getLexer().isNot(AsmToken::Colon))
return X86Operand::CreateReg(RegNo, Start, End);
getParser().Lex(); // Eat the colon.
return ParseMemOperand(RegNo, Start);
}
case AsmToken::Dollar: {
// $42 -> immediate.
SMLoc Start = Parser.getTok().getLoc(), End;
Parser.Lex();
const MCExpr *Val;
if (getParser().parseExpression(Val, End))
return 0;
return X86Operand::CreateImm(Val, Start, End);
}
}
}
/// ParseMemOperand: segment: disp(basereg, indexreg, scale). The '%ds:' prefix
/// has already been parsed if present.
X86Operand *X86AsmParser::ParseMemOperand(unsigned SegReg, SMLoc MemStart) {
// We have to disambiguate a parenthesized expression "(4+5)" from the start
// of a memory operand with a missing displacement "(%ebx)" or "(,%eax)". The
// only way to do this without lookahead is to eat the '(' and see what is
// after it.
const MCExpr *Disp = MCConstantExpr::Create(0, getParser().getContext());
if (getLexer().isNot(AsmToken::LParen)) {
SMLoc ExprEnd;
if (getParser().parseExpression(Disp, ExprEnd)) return 0;
// After parsing the base expression we could either have a parenthesized
// memory address or not. If not, return now. If so, eat the (.
if (getLexer().isNot(AsmToken::LParen)) {
// Unless we have a segment register, treat this as an immediate.
if (SegReg == 0)
return X86Operand::CreateMem(Disp, MemStart, ExprEnd);
return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, MemStart, ExprEnd);
}
// Eat the '('.
Parser.Lex();
} else {
// Okay, we have a '('. We don't know if this is an expression or not, but
// so we have to eat the ( to see beyond it.
SMLoc LParenLoc = Parser.getTok().getLoc();
Parser.Lex(); // Eat the '('.
if (getLexer().is(AsmToken::Percent) || getLexer().is(AsmToken::Comma)) {
// Nothing to do here, fall into the code below with the '(' part of the
// memory operand consumed.
} else {
SMLoc ExprEnd;
// It must be an parenthesized expression, parse it now.
if (getParser().parseParenExpression(Disp, ExprEnd))
return 0;
// After parsing the base expression we could either have a parenthesized
// memory address or not. If not, return now. If so, eat the (.
if (getLexer().isNot(AsmToken::LParen)) {
// Unless we have a segment register, treat this as an immediate.
if (SegReg == 0)
return X86Operand::CreateMem(Disp, LParenLoc, ExprEnd);
return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, MemStart, ExprEnd);
}
// Eat the '('.
Parser.Lex();
}
}
// If we reached here, then we just ate the ( of the memory operand. Process
// the rest of the memory operand.
unsigned BaseReg = 0, IndexReg = 0, Scale = 1;
SMLoc IndexLoc;
if (getLexer().is(AsmToken::Percent)) {
SMLoc StartLoc, EndLoc;
if (ParseRegister(BaseReg, StartLoc, EndLoc)) return 0;
if (BaseReg == X86::EIZ || BaseReg == X86::RIZ) {
Error(StartLoc, "eiz and riz can only be used as index registers",
SMRange(StartLoc, EndLoc));
return 0;
}
}
if (getLexer().is(AsmToken::Comma)) {
Parser.Lex(); // Eat the comma.
IndexLoc = Parser.getTok().getLoc();
// Following the comma we should have either an index register, or a scale
// value. We don't support the later form, but we want to parse it
// correctly.
//
// Not that even though it would be completely consistent to support syntax
// like "1(%eax,,1)", the assembler doesn't. Use "eiz" or "riz" for this.
if (getLexer().is(AsmToken::Percent)) {
SMLoc L;
if (ParseRegister(IndexReg, L, L)) return 0;
if (getLexer().isNot(AsmToken::RParen)) {
// Parse the scale amount:
// ::= ',' [scale-expression]
if (getLexer().isNot(AsmToken::Comma)) {
Error(Parser.getTok().getLoc(),
"expected comma in scale expression");
return 0;
}
Parser.Lex(); // Eat the comma.
if (getLexer().isNot(AsmToken::RParen)) {
SMLoc Loc = Parser.getTok().getLoc();
int64_t ScaleVal;
if (getParser().parseAbsoluteExpression(ScaleVal)){
Error(Loc, "expected scale expression");
return 0;
}
// Validate the scale amount.
if (ScaleVal != 1 && ScaleVal != 2 && ScaleVal != 4 && ScaleVal != 8){
Error(Loc, "scale factor in address must be 1, 2, 4 or 8");
return 0;
}
Scale = (unsigned)ScaleVal;
}
}
} else if (getLexer().isNot(AsmToken::RParen)) {
// A scale amount without an index is ignored.
// index.
SMLoc Loc = Parser.getTok().getLoc();
int64_t Value;
if (getParser().parseAbsoluteExpression(Value))
return 0;
if (Value != 1)
Warning(Loc, "scale factor without index register is ignored");
Scale = 1;
}
}
// Ok, we've eaten the memory operand, verify we have a ')' and eat it too.
if (getLexer().isNot(AsmToken::RParen)) {
Error(Parser.getTok().getLoc(), "unexpected token in memory operand");
return 0;
}
SMLoc MemEnd = Parser.getTok().getEndLoc();
Parser.Lex(); // Eat the ')'.
// If we have both a base register and an index register make sure they are
// both 64-bit or 32-bit registers.
// To support VSIB, IndexReg can be 128-bit or 256-bit registers.
if (BaseReg != 0 && IndexReg != 0) {
if (X86MCRegisterClasses[X86::GR64RegClassID].contains(BaseReg) &&
(X86MCRegisterClasses[X86::GR16RegClassID].contains(IndexReg) ||
X86MCRegisterClasses[X86::GR32RegClassID].contains(IndexReg)) &&
IndexReg != X86::RIZ) {
Error(IndexLoc, "index register is 32-bit, but base register is 64-bit");
return 0;
}
if (X86MCRegisterClasses[X86::GR32RegClassID].contains(BaseReg) &&
(X86MCRegisterClasses[X86::GR16RegClassID].contains(IndexReg) ||
X86MCRegisterClasses[X86::GR64RegClassID].contains(IndexReg)) &&
IndexReg != X86::EIZ){
Error(IndexLoc, "index register is 64-bit, but base register is 32-bit");
return 0;
}
}
return X86Operand::CreateMem(SegReg, Disp, BaseReg, IndexReg, Scale,
MemStart, MemEnd);
}
bool X86AsmParser::
ParseInstruction(ParseInstructionInfo &Info, StringRef Name, SMLoc NameLoc,
SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
InstInfo = &Info;
StringRef PatchedName = Name;
// FIXME: Hack to recognize setneb as setne.
if (PatchedName.startswith("set") && PatchedName.endswith("b") &&
PatchedName != "setb" && PatchedName != "setnb")
PatchedName = PatchedName.substr(0, Name.size()-1);
// FIXME: Hack to recognize cmp<comparison code>{ss,sd,ps,pd}.
const MCExpr *ExtraImmOp = 0;
if ((PatchedName.startswith("cmp") || PatchedName.startswith("vcmp")) &&
(PatchedName.endswith("ss") || PatchedName.endswith("sd") ||
PatchedName.endswith("ps") || PatchedName.endswith("pd"))) {
bool IsVCMP = PatchedName[0] == 'v';
unsigned SSECCIdx = IsVCMP ? 4 : 3;
unsigned SSEComparisonCode = StringSwitch<unsigned>(
PatchedName.slice(SSECCIdx, PatchedName.size() - 2))
.Case("eq", 0x00)
.Case("lt", 0x01)
.Case("le", 0x02)
.Case("unord", 0x03)
.Case("neq", 0x04)
.Case("nlt", 0x05)
.Case("nle", 0x06)
.Case("ord", 0x07)
/* AVX only from here */
.Case("eq_uq", 0x08)
.Case("nge", 0x09)
.Case("ngt", 0x0A)
.Case("false", 0x0B)
.Case("neq_oq", 0x0C)
.Case("ge", 0x0D)
.Case("gt", 0x0E)
.Case("true", 0x0F)
.Case("eq_os", 0x10)
.Case("lt_oq", 0x11)
.Case("le_oq", 0x12)
.Case("unord_s", 0x13)
.Case("neq_us", 0x14)
.Case("nlt_uq", 0x15)
.Case("nle_uq", 0x16)
.Case("ord_s", 0x17)
.Case("eq_us", 0x18)
.Case("nge_uq", 0x19)
.Case("ngt_uq", 0x1A)
.Case("false_os", 0x1B)
.Case("neq_os", 0x1C)
.Case("ge_oq", 0x1D)
.Case("gt_oq", 0x1E)
.Case("true_us", 0x1F)
.Default(~0U);
if (SSEComparisonCode != ~0U && (IsVCMP || SSEComparisonCode < 8)) {
ExtraImmOp = MCConstantExpr::Create(SSEComparisonCode,
getParser().getContext());
if (PatchedName.endswith("ss")) {
PatchedName = IsVCMP ? "vcmpss" : "cmpss";
} else if (PatchedName.endswith("sd")) {
PatchedName = IsVCMP ? "vcmpsd" : "cmpsd";
} else if (PatchedName.endswith("ps")) {
PatchedName = IsVCMP ? "vcmpps" : "cmpps";
} else {
assert(PatchedName.endswith("pd") && "Unexpected mnemonic!");
PatchedName = IsVCMP ? "vcmppd" : "cmppd";
}
}
}
Operands.push_back(X86Operand::CreateToken(PatchedName, NameLoc));
if (ExtraImmOp && !isParsingIntelSyntax())
Operands.push_back(X86Operand::CreateImm(ExtraImmOp, NameLoc, NameLoc));
// Determine whether this is an instruction prefix.
bool isPrefix =
Name == "lock" || Name == "rep" ||
Name == "repe" || Name == "repz" ||
Name == "repne" || Name == "repnz" ||
Name == "rex64" || Name == "data16";
// This does the actual operand parsing. Don't parse any more if we have a
// prefix juxtaposed with an operation like "lock incl 4(%rax)", because we
// just want to parse the "lock" as the first instruction and the "incl" as
// the next one.
if (getLexer().isNot(AsmToken::EndOfStatement) && !isPrefix) {
// Parse '*' modifier.
if (getLexer().is(AsmToken::Star)) {
SMLoc Loc = Parser.getTok().getLoc();
Operands.push_back(X86Operand::CreateToken("*", Loc));
Parser.Lex(); // Eat the star.
}
// Read the first operand.
if (X86Operand *Op = ParseOperand())
Operands.push_back(Op);
else {
Parser.eatToEndOfStatement();
return true;
}
while (getLexer().is(AsmToken::Comma)) {
Parser.Lex(); // Eat the comma.
// Parse and remember the operand.
if (X86Operand *Op = ParseOperand())
Operands.push_back(Op);
else {
Parser.eatToEndOfStatement();
return true;
}
}
if (getLexer().isNot(AsmToken::EndOfStatement)) {
SMLoc Loc = getLexer().getLoc();
Parser.eatToEndOfStatement();
return Error(Loc, "unexpected token in argument list");
}
}
if (getLexer().is(AsmToken::EndOfStatement))
Parser.Lex(); // Consume the EndOfStatement
else if (isPrefix && getLexer().is(AsmToken::Slash))
Parser.Lex(); // Consume the prefix separator Slash
if (ExtraImmOp && isParsingIntelSyntax())
Operands.push_back(X86Operand::CreateImm(ExtraImmOp, NameLoc, NameLoc));
// This is a terrible hack to handle "out[bwl]? %al, (%dx)" ->
// "outb %al, %dx". Out doesn't take a memory form, but this is a widely
// documented form in various unofficial manuals, so a lot of code uses it.
if ((Name == "outb" || Name == "outw" || Name == "outl" || Name == "out") &&
Operands.size() == 3) {
X86Operand &Op = *(X86Operand*)Operands.back();
if (Op.isMem() && Op.Mem.SegReg == 0 &&
isa<MCConstantExpr>(Op.Mem.Disp) &&
cast<MCConstantExpr>(Op.Mem.Disp)->getValue() == 0 &&
Op.Mem.BaseReg == MatchRegisterName("dx") && Op.Mem.IndexReg == 0) {
SMLoc Loc = Op.getEndLoc();
Operands.back() = X86Operand::CreateReg(Op.Mem.BaseReg, Loc, Loc);
delete &Op;
}
}
// Same hack for "in[bwl]? (%dx), %al" -> "inb %dx, %al".
if ((Name == "inb" || Name == "inw" || Name == "inl" || Name == "in") &&
Operands.size() == 3) {
X86Operand &Op = *(X86Operand*)Operands.begin()[1];
if (Op.isMem() && Op.Mem.SegReg == 0 &&
isa<MCConstantExpr>(Op.Mem.Disp) &&
cast<MCConstantExpr>(Op.Mem.Disp)->getValue() == 0 &&
Op.Mem.BaseReg == MatchRegisterName("dx") && Op.Mem.IndexReg == 0) {
SMLoc Loc = Op.getEndLoc();
Operands.begin()[1] = X86Operand::CreateReg(Op.Mem.BaseReg, Loc, Loc);
delete &Op;
}
}
// Transform "ins[bwl] %dx, %es:(%edi)" into "ins[bwl]"
if (Name.startswith("ins") && Operands.size() == 3 &&
(Name == "insb" || Name == "insw" || Name == "insl")) {
X86Operand &Op = *(X86Operand*)Operands.begin()[1];
X86Operand &Op2 = *(X86Operand*)Operands.begin()[2];
if (Op.isReg() && Op.getReg() == X86::DX && isDstOp(Op2)) {
Operands.pop_back();
Operands.pop_back();
delete &Op;
delete &Op2;
}
}
// Transform "outs[bwl] %ds:(%esi), %dx" into "out[bwl]"
if (Name.startswith("outs") && Operands.size() == 3 &&
(Name == "outsb" || Name == "outsw" || Name == "outsl")) {
X86Operand &Op = *(X86Operand*)Operands.begin()[1];
X86Operand &Op2 = *(X86Operand*)Operands.begin()[2];
if (isSrcOp(Op) && Op2.isReg() && Op2.getReg() == X86::DX) {
Operands.pop_back();
Operands.pop_back();
delete &Op;
delete &Op2;
}
}
// Transform "movs[bwl] %ds:(%esi), %es:(%edi)" into "movs[bwl]"
if (Name.startswith("movs") && Operands.size() == 3 &&
(Name == "movsb" || Name == "movsw" || Name == "movsl" ||
(is64BitMode() && Name == "movsq"))) {
X86Operand &Op = *(X86Operand*)Operands.begin()[1];
X86Operand &Op2 = *(X86Operand*)Operands.begin()[2];
if (isSrcOp(Op) && isDstOp(Op2)) {
Operands.pop_back();
Operands.pop_back();
delete &Op;
delete &Op2;
}
}
// Transform "lods[bwl] %ds:(%esi),{%al,%ax,%eax,%rax}" into "lods[bwl]"
if (Name.startswith("lods") && Operands.size() == 3 &&
(Name == "lods" || Name == "lodsb" || Name == "lodsw" ||
Name == "lodsl" || (is64BitMode() && Name == "lodsq"))) {
X86Operand *Op1 = static_cast<X86Operand*>(Operands[1]);
X86Operand *Op2 = static_cast<X86Operand*>(Operands[2]);
if (isSrcOp(*Op1) && Op2->isReg()) {
const char *ins;
unsigned reg = Op2->getReg();
bool isLods = Name == "lods";
if (reg == X86::AL && (isLods || Name == "lodsb"))
ins = "lodsb";
else if (reg == X86::AX && (isLods || Name == "lodsw"))
ins = "lodsw";
else if (reg == X86::EAX && (isLods || Name == "lodsl"))
ins = "lodsl";
else if (reg == X86::RAX && (isLods || Name == "lodsq"))
ins = "lodsq";
else
ins = NULL;
if (ins != NULL) {
Operands.pop_back();
Operands.pop_back();
delete Op1;
delete Op2;
if (Name != ins)
static_cast<X86Operand*>(Operands[0])->setTokenValue(ins);
}
}
}
// Transform "stos[bwl] {%al,%ax,%eax,%rax},%es:(%edi)" into "stos[bwl]"
if (Name.startswith("stos") && Operands.size() == 3 &&
(Name == "stos" || Name == "stosb" || Name == "stosw" ||
Name == "stosl" || (is64BitMode() && Name == "stosq"))) {
X86Operand *Op1 = static_cast<X86Operand*>(Operands[1]);
X86Operand *Op2 = static_cast<X86Operand*>(Operands[2]);
if (isDstOp(*Op2) && Op1->isReg()) {
const char *ins;
unsigned reg = Op1->getReg();
bool isStos = Name == "stos";
if (reg == X86::AL && (isStos || Name == "stosb"))
ins = "stosb";
else if (reg == X86::AX && (isStos || Name == "stosw"))
ins = "stosw";
else if (reg == X86::EAX && (isStos || Name == "stosl"))
ins = "stosl";
else if (reg == X86::RAX && (isStos || Name == "stosq"))
ins = "stosq";
else
ins = NULL;
if (ins != NULL) {
Operands.pop_back();
Operands.pop_back();
delete Op1;
delete Op2;
if (Name != ins)
static_cast<X86Operand*>(Operands[0])->setTokenValue(ins);
}
}
}
// FIXME: Hack to handle recognize s{hr,ar,hl} $1, <op>. Canonicalize to
// "shift <op>".
if ((Name.startswith("shr") || Name.startswith("sar") ||
Name.startswith("shl") || Name.startswith("sal") ||
Name.startswith("rcl") || Name.startswith("rcr") ||
Name.startswith("rol") || Name.startswith("ror")) &&
Operands.size() == 3) {
if (isParsingIntelSyntax()) {
// Intel syntax
X86Operand *Op1 = static_cast<X86Operand*>(Operands[2]);
if (Op1->isImm() && isa<MCConstantExpr>(Op1->getImm()) &&
cast<MCConstantExpr>(Op1->getImm())->getValue() == 1) {
delete Operands[2];
Operands.pop_back();
}
} else {
X86Operand *Op1 = static_cast<X86Operand*>(Operands[1]);
if (Op1->isImm() && isa<MCConstantExpr>(Op1->getImm()) &&
cast<MCConstantExpr>(Op1->getImm())->getValue() == 1) {
delete Operands[1];
Operands.erase(Operands.begin() + 1);
}
}
}
// Transforms "int $3" into "int3" as a size optimization. We can't write an
// instalias with an immediate operand yet.
if (Name == "int" && Operands.size() == 2) {
X86Operand *Op1 = static_cast<X86Operand*>(Operands[1]);
if (Op1->isImm() && isa<MCConstantExpr>(Op1->getImm()) &&
cast<MCConstantExpr>(Op1->getImm())->getValue() == 3) {
delete Operands[1];
Operands.erase(Operands.begin() + 1);
static_cast<X86Operand*>(Operands[0])->setTokenValue("int3");
}
}
return false;
}
static bool convertToSExti8(MCInst &Inst, unsigned Opcode, unsigned Reg,
bool isCmp) {
MCInst TmpInst;
TmpInst.setOpcode(Opcode);
if (!isCmp)
TmpInst.addOperand(MCOperand::CreateReg(Reg));
TmpInst.addOperand(MCOperand::CreateReg(Reg));
TmpInst.addOperand(Inst.getOperand(0));
Inst = TmpInst;
return true;
}
static bool convert16i16to16ri8(MCInst &Inst, unsigned Opcode,
bool isCmp = false) {
if (!Inst.getOperand(0).isImm() ||
!isImmSExti16i8Value(Inst.getOperand(0).getImm()))
return false;
return convertToSExti8(Inst, Opcode, X86::AX, isCmp);
}
static bool convert32i32to32ri8(MCInst &Inst, unsigned Opcode,
bool isCmp = false) {
if (!Inst.getOperand(0).isImm() ||
!isImmSExti32i8Value(Inst.getOperand(0).getImm()))
return false;
return convertToSExti8(Inst, Opcode, X86::EAX, isCmp);
}
static bool convert64i32to64ri8(MCInst &Inst, unsigned Opcode,
bool isCmp = false) {
if (!Inst.getOperand(0).isImm() ||
!isImmSExti64i8Value(Inst.getOperand(0).getImm()))
return false;
return convertToSExti8(Inst, Opcode, X86::RAX, isCmp);
}
bool X86AsmParser::
processInstruction(MCInst &Inst,
const SmallVectorImpl<MCParsedAsmOperand*> &Ops) {
switch (Inst.getOpcode()) {
default: return false;
case X86::AND16i16: return convert16i16to16ri8(Inst, X86::AND16ri8);
case X86::AND32i32: return convert32i32to32ri8(Inst, X86::AND32ri8);
case X86::AND64i32: return convert64i32to64ri8(Inst, X86::AND64ri8);
case X86::XOR16i16: return convert16i16to16ri8(Inst, X86::XOR16ri8);
case X86::XOR32i32: return convert32i32to32ri8(Inst, X86::XOR32ri8);
case X86::XOR64i32: return convert64i32to64ri8(Inst, X86::XOR64ri8);
case X86::OR16i16: return convert16i16to16ri8(Inst, X86::OR16ri8);
case X86::OR32i32: return convert32i32to32ri8(Inst, X86::OR32ri8);
case X86::OR64i32: return convert64i32to64ri8(Inst, X86::OR64ri8);
case X86::CMP16i16: return convert16i16to16ri8(Inst, X86::CMP16ri8, true);
case X86::CMP32i32: return convert32i32to32ri8(Inst, X86::CMP32ri8, true);
case X86::CMP64i32: return convert64i32to64ri8(Inst, X86::CMP64ri8, true);
case X86::ADD16i16: return convert16i16to16ri8(Inst, X86::ADD16ri8);
case X86::ADD32i32: return convert32i32to32ri8(Inst, X86::ADD32ri8);
case X86::ADD64i32: return convert64i32to64ri8(Inst, X86::ADD64ri8);
case X86::SUB16i16: return convert16i16to16ri8(Inst, X86::SUB16ri8);
case X86::SUB32i32: return convert32i32to32ri8(Inst, X86::SUB32ri8);
case X86::SUB64i32: return convert64i32to64ri8(Inst, X86::SUB64ri8);
case X86::ADC16i16: return convert16i16to16ri8(Inst, X86::ADC16ri8);
case X86::ADC32i32: return convert32i32to32ri8(Inst, X86::ADC32ri8);
case X86::ADC64i32: return convert64i32to64ri8(Inst, X86::ADC64ri8);
case X86::SBB16i16: return convert16i16to16ri8(Inst, X86::SBB16ri8);
case X86::SBB32i32: return convert32i32to32ri8(Inst, X86::SBB32ri8);
case X86::SBB64i32: return convert64i32to64ri8(Inst, X86::SBB64ri8);
}
}
static const char *getSubtargetFeatureName(unsigned Val);
bool X86AsmParser::
MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
SmallVectorImpl<MCParsedAsmOperand*> &Operands,
MCStreamer &Out, unsigned &ErrorInfo,
bool MatchingInlineAsm) {
assert(!Operands.empty() && "Unexpect empty operand list!");
X86Operand *Op = static_cast<X86Operand*>(Operands[0]);
assert(Op->isToken() && "Leading operand should always be a mnemonic!");
ArrayRef<SMRange> EmptyRanges = ArrayRef<SMRange>();
// First, handle aliases that expand to multiple instructions.
// FIXME: This should be replaced with a real .td file alias mechanism.
// Also, MatchInstructionImpl should actually *do* the EmitInstruction
// call.
if (Op->getToken() == "fstsw" || Op->getToken() == "fstcw" ||
Op->getToken() == "fstsww" || Op->getToken() == "fstcww" ||
Op->getToken() == "finit" || Op->getToken() == "fsave" ||
Op->getToken() == "fstenv" || Op->getToken() == "fclex") {
MCInst Inst;
Inst.setOpcode(X86::WAIT);
Inst.setLoc(IDLoc);
if (!MatchingInlineAsm)
Out.EmitInstruction(Inst);
const char *Repl =
StringSwitch<const char*>(Op->getToken())
.Case("finit", "fninit")
.Case("fsave", "fnsave")
.Case("fstcw", "fnstcw")
.Case("fstcww", "fnstcw")
.Case("fstenv", "fnstenv")
.Case("fstsw", "fnstsw")
.Case("fstsww", "fnstsw")
.Case("fclex", "fnclex")
.Default(0);
assert(Repl && "Unknown wait-prefixed instruction");
delete Operands[0];
Operands[0] = X86Operand::CreateToken(Repl, IDLoc);
}
bool WasOriginallyInvalidOperand = false;
MCInst Inst;
// First, try a direct match.
switch (MatchInstructionImpl(Operands, Inst,
ErrorInfo, MatchingInlineAsm,
isParsingIntelSyntax())) {
default: break;
case Match_Success:
// Some instructions need post-processing to, for example, tweak which
// encoding is selected. Loop on it while changes happen so the
// individual transformations can chain off each other.
if (!MatchingInlineAsm)
while (processInstruction(Inst, Operands))
;
Inst.setLoc(IDLoc);
if (!MatchingInlineAsm)
Out.EmitInstruction(Inst);
Opcode = Inst.getOpcode();
return false;
case Match_MissingFeature: {
assert(ErrorInfo && "Unknown missing feature!");
// Special case the error message for the very common case where only
// a single subtarget feature is missing.
std::string Msg = "instruction requires:";
unsigned Mask = 1;
for (unsigned i = 0; i < (sizeof(ErrorInfo)*8-1); ++i) {
if (ErrorInfo & Mask) {
Msg += " ";
Msg += getSubtargetFeatureName(ErrorInfo & Mask);
}
Mask <<= 1;
}
return Error(IDLoc, Msg, EmptyRanges, MatchingInlineAsm);
}
case Match_InvalidOperand:
WasOriginallyInvalidOperand = true;
break;
case Match_MnemonicFail:
break;
}
// FIXME: Ideally, we would only attempt suffix matches for things which are
// valid prefixes, and we could just infer the right unambiguous
// type. However, that requires substantially more matcher support than the
// following hack.
// Change the operand to point to a temporary token.
StringRef Base = Op->getToken();
SmallString<16> Tmp;
Tmp += Base;
Tmp += ' ';
Op->setTokenValue(Tmp.str());
// If this instruction starts with an 'f', then it is a floating point stack
// instruction. These come in up to three forms for 32-bit, 64-bit, and
// 80-bit floating point, which use the suffixes s,l,t respectively.
//
// Otherwise, we assume that this may be an integer instruction, which comes
// in 8/16/32/64-bit forms using the b,w,l,q suffixes respectively.
const char *Suffixes = Base[0] != 'f' ? "bwlq" : "slt\0";
// Check for the various suffix matches.
Tmp[Base.size()] = Suffixes[0];
unsigned ErrorInfoIgnore;
unsigned ErrorInfoMissingFeature = 0; // Init suppresses compiler warnings.
unsigned Match1, Match2, Match3, Match4;
Match1 = MatchInstructionImpl(Operands, Inst, ErrorInfoIgnore,
isParsingIntelSyntax());
// If this returned as a missing feature failure, remember that.
if (Match1 == Match_MissingFeature)
ErrorInfoMissingFeature = ErrorInfoIgnore;
Tmp[Base.size()] = Suffixes[1];
Match2 = MatchInstructionImpl(Operands, Inst, ErrorInfoIgnore,
isParsingIntelSyntax());
// If this returned as a missing feature failure, remember that.
if (Match2 == Match_MissingFeature)
ErrorInfoMissingFeature = ErrorInfoIgnore;
Tmp[Base.size()] = Suffixes[2];
Match3 = MatchInstructionImpl(Operands, Inst, ErrorInfoIgnore,
isParsingIntelSyntax());
// If this returned as a missing feature failure, remember that.
if (Match3 == Match_MissingFeature)
ErrorInfoMissingFeature = ErrorInfoIgnore;
Tmp[Base.size()] = Suffixes[3];
Match4 = MatchInstructionImpl(Operands, Inst, ErrorInfoIgnore,
isParsingIntelSyntax());
// If this returned as a missing feature failure, remember that.
if (Match4 == Match_MissingFeature)
ErrorInfoMissingFeature = ErrorInfoIgnore;
// Restore the old token.
Op->setTokenValue(Base);
// If exactly one matched, then we treat that as a successful match (and the
// instruction will already have been filled in correctly, since the failing
// matches won't have modified it).
unsigned NumSuccessfulMatches =
(Match1 == Match_Success) + (Match2 == Match_Success) +
(Match3 == Match_Success) + (Match4 == Match_Success);
if (NumSuccessfulMatches == 1) {
Inst.setLoc(IDLoc);
if (!MatchingInlineAsm)
Out.EmitInstruction(Inst);
Opcode = Inst.getOpcode();
return false;
}
// Otherwise, the match failed, try to produce a decent error message.
// If we had multiple suffix matches, then identify this as an ambiguous
// match.
if (NumSuccessfulMatches > 1) {
char MatchChars[4];
unsigned NumMatches = 0;
if (Match1 == Match_Success) MatchChars[NumMatches++] = Suffixes[0];
if (Match2 == Match_Success) MatchChars[NumMatches++] = Suffixes[1];
if (Match3 == Match_Success) MatchChars[NumMatches++] = Suffixes[2];
if (Match4 == Match_Success) MatchChars[NumMatches++] = Suffixes[3];
SmallString<126> Msg;
raw_svector_ostream OS(Msg);
OS << "ambiguous instructions require an explicit suffix (could be ";
for (unsigned i = 0; i != NumMatches; ++i) {
if (i != 0)
OS << ", ";
if (i + 1 == NumMatches)
OS << "or ";
OS << "'" << Base << MatchChars[i] << "'";
}
OS << ")";
Error(IDLoc, OS.str(), EmptyRanges, MatchingInlineAsm);
return true;
}
// Okay, we know that none of the variants matched successfully.
// If all of the instructions reported an invalid mnemonic, then the original
// mnemonic was invalid.
if ((Match1 == Match_MnemonicFail) && (Match2 == Match_MnemonicFail) &&
(Match3 == Match_MnemonicFail) && (Match4 == Match_MnemonicFail)) {
if (!WasOriginallyInvalidOperand) {
ArrayRef<SMRange> Ranges = MatchingInlineAsm ? EmptyRanges :
Op->getLocRange();
return Error(IDLoc, "invalid instruction mnemonic '" + Base + "'",
Ranges, MatchingInlineAsm);
}
// Recover location info for the operand if we know which was the problem.
if (ErrorInfo != ~0U) {
if (ErrorInfo >= Operands.size())
return Error(IDLoc, "too few operands for instruction",
EmptyRanges, MatchingInlineAsm);
X86Operand *Operand = (X86Operand*)Operands[ErrorInfo];
if (Operand->getStartLoc().isValid()) {
SMRange OperandRange = Operand->getLocRange();
return Error(Operand->getStartLoc(), "invalid operand for instruction",
OperandRange, MatchingInlineAsm);
}
}
return Error(IDLoc, "invalid operand for instruction", EmptyRanges,
MatchingInlineAsm);
}
// If one instruction matched with a missing feature, report this as a
// missing feature.
if ((Match1 == Match_MissingFeature) + (Match2 == Match_MissingFeature) +
(Match3 == Match_MissingFeature) + (Match4 == Match_MissingFeature) == 1){
std::string Msg = "instruction requires:";
unsigned Mask = 1;
for (unsigned i = 0; i < (sizeof(ErrorInfoMissingFeature)*8-1); ++i) {
if (ErrorInfoMissingFeature & Mask) {
Msg += " ";
Msg += getSubtargetFeatureName(ErrorInfoMissingFeature & Mask);
}
Mask <<= 1;
}
return Error(IDLoc, Msg, EmptyRanges, MatchingInlineAsm);
}
// If one instruction matched with an invalid operand, report this as an
// operand failure.
if ((Match1 == Match_InvalidOperand) + (Match2 == Match_InvalidOperand) +
(Match3 == Match_InvalidOperand) + (Match4 == Match_InvalidOperand) == 1){
Error(IDLoc, "invalid operand for instruction", EmptyRanges,
MatchingInlineAsm);
return true;
}
// If all of these were an outright failure, report it in a useless way.
Error(IDLoc, "unknown use of instruction mnemonic without a size suffix",
EmptyRanges, MatchingInlineAsm);
return true;
}
bool X86AsmParser::ParseDirective(AsmToken DirectiveID) {
StringRef IDVal = DirectiveID.getIdentifier();
if (IDVal == ".word")
return ParseDirectiveWord(2, DirectiveID.getLoc());
else if (IDVal.startswith(".code"))
return ParseDirectiveCode(IDVal, DirectiveID.getLoc());
else if (IDVal.startswith(".att_syntax")) {
getParser().setAssemblerDialect(0);
return false;
} else if (IDVal.startswith(".intel_syntax")) {
getParser().setAssemblerDialect(1);
if (getLexer().isNot(AsmToken::EndOfStatement)) {
if(Parser.getTok().getString() == "noprefix") {
// FIXME : Handle noprefix
Parser.Lex();
} else
return true;
}
return false;
}
return true;
}
/// ParseDirectiveWord
/// ::= .word [ expression (, expression)* ]
bool X86AsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
if (getLexer().isNot(AsmToken::EndOfStatement)) {
for (;;) {
const MCExpr *Value;
if (getParser().parseExpression(Value))
return true;
getParser().getStreamer().EmitValue(Value, Size);
if (getLexer().is(AsmToken::EndOfStatement))
break;
// FIXME: Improve diagnostic.
if (getLexer().isNot(AsmToken::Comma))
return Error(L, "unexpected token in directive");
Parser.Lex();
}
}
Parser.Lex();
return false;
}
/// ParseDirectiveCode
/// ::= .code32 | .code64
bool X86AsmParser::ParseDirectiveCode(StringRef IDVal, SMLoc L) {
if (IDVal == ".code32") {
Parser.Lex();
if (is64BitMode()) {
SwitchMode();
getParser().getStreamer().EmitAssemblerFlag(MCAF_Code32);
}
} else if (IDVal == ".code64") {
Parser.Lex();
if (!is64BitMode()) {
SwitchMode();
getParser().getStreamer().EmitAssemblerFlag(MCAF_Code64);
}
} else {
return Error(L, "unexpected directive " + IDVal);
}
return false;
}
// Force static initialization.
extern "C" void LLVMInitializeX86AsmParser() {
RegisterMCAsmParser<X86AsmParser> X(TheX86_32Target);
RegisterMCAsmParser<X86AsmParser> Y(TheX86_64Target);
}
#define GET_REGISTER_MATCHER
#define GET_MATCHER_IMPLEMENTATION
#define GET_SUBTARGET_FEATURE_NAME
#include "X86GenAsmMatcher.inc"