/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp

Bug Summary

File:	llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
Warning:	line 2060, column 11 Called C++ object pointer is null

Annotated Source Code

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/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp

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1//===-- RISCVAsmParser.cpp - Parse RISCV assembly to MCInst instructions --===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//

9#include "MCTargetDesc/RISCVAsmBackend.h"
10#include "MCTargetDesc/RISCVMCExpr.h"
11#include "MCTargetDesc/RISCVMCTargetDesc.h"
12#include "MCTargetDesc/RISCVTargetStreamer.h"
13#include "RISCVInstrInfo.h"
14#include "TargetInfo/RISCVTargetInfo.h"
15#include "Utils/RISCVBaseInfo.h"
16#include "Utils/RISCVMatInt.h"
17#include "llvm/ADT/STLExtras.h"
18#include "llvm/ADT/SmallBitVector.h"
19#include "llvm/ADT/SmallString.h"
20#include "llvm/ADT/SmallVector.h"
21#include "llvm/ADT/Statistic.h"
22#include "llvm/ADT/StringSwitch.h"
23#include "llvm/CodeGen/Register.h"
24#include "llvm/MC/MCAssembler.h"
25#include "llvm/MC/MCContext.h"
26#include "llvm/MC/MCExpr.h"
27#include "llvm/MC/MCInst.h"
28#include "llvm/MC/MCInstBuilder.h"
29#include "llvm/MC/MCObjectFileInfo.h"
30#include "llvm/MC/MCParser/MCAsmLexer.h"
31#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
32#include "llvm/MC/MCParser/MCTargetAsmParser.h"
33#include "llvm/MC/MCRegisterInfo.h"
34#include "llvm/MC/MCStreamer.h"
35#include "llvm/MC/MCSubtargetInfo.h"
36#include "llvm/Support/Casting.h"
37#include "llvm/Support/MathExtras.h"
38#include "llvm/Support/RISCVAttributes.h"
39#include "llvm/Support/TargetRegistry.h"

41#include <limits>

43using namespace llvm;

45#define DEBUG_TYPE"riscv-asm-parser" "riscv-asm-parser"

47// Include the auto-generated portion of the compress emitter.
48#define GEN_COMPRESS_INSTR
49#include "RISCVGenCompressInstEmitter.inc"

51STATISTIC(RISCVNumInstrsCompressed,static llvm::Statistic RISCVNumInstrsCompressed = {"riscv-asm-parser"
, "RISCVNumInstrsCompressed", "Number of RISC-V Compressed instructions emitted"
}
        "Number of RISC-V Compressed instructions emitted")static llvm::Statistic RISCVNumInstrsCompressed = {"riscv-asm-parser"
, "RISCVNumInstrsCompressed", "Number of RISC-V Compressed instructions emitted"
};

54namespace {
55struct RISCVOperand;

57struct ParserOptionsSet {
bool IsPicEnabled;
59};

61class RISCVAsmParser : public MCTargetAsmParser {
SmallVector<FeatureBitset, 4> FeatureBitStack;

SmallVector<ParserOptionsSet, 4> ParserOptionsStack;
ParserOptionsSet ParserOptions;

SMLoc getLoc() const { return getParser().getTok().getLoc(); }
bool isRV64() const { return getSTI().hasFeature(RISCV::Feature64Bit); }
bool isRV32E() const { return getSTI().hasFeature(RISCV::FeatureRV32E); }

RISCVTargetStreamer &getTargetStreamer() {
  MCTargetStreamer &TS = *getParser().getStreamer().getTargetStreamer();
  return static_cast<RISCVTargetStreamer &>(TS);
}

unsigned validateTargetOperandClass(MCParsedAsmOperand &Op,
                                    unsigned Kind) override;

bool generateImmOutOfRangeError(OperandVector &Operands, uint64_t ErrorInfo,
                                int64_t Lower, int64_t Upper, Twine Msg);

bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                             OperandVector &Operands, MCStreamer &Out,
                             uint64_t &ErrorInfo,
                             bool MatchingInlineAsm) override;

bool ParseRegister(unsigned &RegNo, SMLoc &StartLoc, SMLoc &EndLoc) override;
OperandMatchResultTy tryParseRegister(unsigned &RegNo, SMLoc &StartLoc,
                                      SMLoc &EndLoc) override;

bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
                      SMLoc NameLoc, OperandVector &Operands) override;

bool ParseDirective(AsmToken DirectiveID) override;

// Helper to actually emit an instruction to the MCStreamer. Also, when
// possible, compression of the instruction is performed.
void emitToStreamer(MCStreamer &S, const MCInst &Inst);

// Helper to emit a combination of LUI, ADDI(W), and SLLI instructions that
// synthesize the desired immedate value into the destination register.
void emitLoadImm(Register DestReg, int64_t Value, MCStreamer &Out);

// Helper to emit a combination of AUIPC and SecondOpcode. Used to implement
// helpers such as emitLoadLocalAddress and emitLoadAddress.
void emitAuipcInstPair(MCOperand DestReg, MCOperand TmpReg,
                       const MCExpr *Symbol, RISCVMCExpr::VariantKind VKHi,
                       unsigned SecondOpcode, SMLoc IDLoc, MCStreamer &Out);

// Helper to emit pseudo instruction "lla" used in PC-rel addressing.
void emitLoadLocalAddress(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out);

// Helper to emit pseudo instruction "la" used in GOT/PC-rel addressing.
void emitLoadAddress(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out);

// Helper to emit pseudo instruction "la.tls.ie" used in initial-exec TLS
// addressing.
void emitLoadTLSIEAddress(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out);

// Helper to emit pseudo instruction "la.tls.gd" used in global-dynamic TLS
// addressing.
void emitLoadTLSGDAddress(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out);

// Helper to emit pseudo load/store instruction with a symbol.
void emitLoadStoreSymbol(MCInst &Inst, unsigned Opcode, SMLoc IDLoc,
                         MCStreamer &Out, bool HasTmpReg);

// Checks that a PseudoAddTPRel is using x4/tp in its second input operand.
// Enforcing this using a restricted register class for the second input
// operand of PseudoAddTPRel results in a poor diagnostic due to the fact
// 'add' is an overloaded mnemonic.
bool checkPseudoAddTPRel(MCInst &Inst, OperandVector &Operands);

// Check instruction constraints.
bool validateInstruction(MCInst &Inst, OperandVector &Operands);

/// Helper for processing MC instructions that have been successfully matched
/// by MatchAndEmitInstruction. Modifications to the emitted instructions,
/// like the expansion of pseudo instructions (e.g., "li"), can be performed
/// in this method.
bool processInstruction(MCInst &Inst, SMLoc IDLoc, OperandVector &Operands,
                        MCStreamer &Out);

144// Auto-generated instruction matching functions
145#define GET_ASSEMBLER_HEADER
146#include "RISCVGenAsmMatcher.inc"

OperandMatchResultTy parseCSRSystemRegister(OperandVector &Operands);
OperandMatchResultTy parseImmediate(OperandVector &Operands);
OperandMatchResultTy parseRegister(OperandVector &Operands,
                                   bool AllowParens = false);
OperandMatchResultTy parseMemOpBaseReg(OperandVector &Operands);
OperandMatchResultTy parseAtomicMemOp(OperandVector &Operands);
OperandMatchResultTy parseOperandWithModifier(OperandVector &Operands);
OperandMatchResultTy parseBareSymbol(OperandVector &Operands);
OperandMatchResultTy parseCallSymbol(OperandVector &Operands);
OperandMatchResultTy parsePseudoJumpSymbol(OperandVector &Operands);
OperandMatchResultTy parseJALOffset(OperandVector &Operands);
OperandMatchResultTy parseVTypeI(OperandVector &Operands);
OperandMatchResultTy parseMaskReg(OperandVector &Operands);

bool parseOperand(OperandVector &Operands, StringRef Mnemonic);

bool parseDirectiveOption();
bool parseDirectiveAttribute();

void setFeatureBits(uint64_t Feature, StringRef FeatureString) {
  if (!(getSTI().getFeatureBits()[Feature])) {
    MCSubtargetInfo &STI = copySTI();
    setAvailableFeatures(
        ComputeAvailableFeatures(STI.ToggleFeature(FeatureString)));
  }
}

bool getFeatureBits(uint64_t Feature) {
  return getSTI().getFeatureBits()[Feature];
}

void clearFeatureBits(uint64_t Feature, StringRef FeatureString) {
  if (getSTI().getFeatureBits()[Feature]) {
    MCSubtargetInfo &STI = copySTI();
    setAvailableFeatures(
        ComputeAvailableFeatures(STI.ToggleFeature(FeatureString)));
  }
}

void pushFeatureBits() {
  assert(FeatureBitStack.size() == ParserOptionsStack.size() &&((FeatureBitStack.size() == ParserOptionsStack.size() &&
 "These two stacks must be kept synchronized") ? static_cast<
void> (0) : __assert_fail ("FeatureBitStack.size() == ParserOptionsStack.size() && \"These two stacks must be kept synchronized\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 189, __PRETTY_FUNCTION__))
         "These two stacks must be kept synchronized")((FeatureBitStack.size() == ParserOptionsStack.size() &&
 "These two stacks must be kept synchronized") ? static_cast<
void> (0) : __assert_fail ("FeatureBitStack.size() == ParserOptionsStack.size() && \"These two stacks must be kept synchronized\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 189, __PRETTY_FUNCTION__));
  FeatureBitStack.push_back(getSTI().getFeatureBits());
  ParserOptionsStack.push_back(ParserOptions);
}

bool popFeatureBits() {
  assert(FeatureBitStack.size() == ParserOptionsStack.size() &&((FeatureBitStack.size() == ParserOptionsStack.size() &&
 "These two stacks must be kept synchronized") ? static_cast<
void> (0) : __assert_fail ("FeatureBitStack.size() == ParserOptionsStack.size() && \"These two stacks must be kept synchronized\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 196, __PRETTY_FUNCTION__))
         "These two stacks must be kept synchronized")((FeatureBitStack.size() == ParserOptionsStack.size() &&
 "These two stacks must be kept synchronized") ? static_cast<
void> (0) : __assert_fail ("FeatureBitStack.size() == ParserOptionsStack.size() && \"These two stacks must be kept synchronized\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 196, __PRETTY_FUNCTION__));
  if (FeatureBitStack.empty())
    return true;

  FeatureBitset FeatureBits = FeatureBitStack.pop_back_val();
  copySTI().setFeatureBits(FeatureBits);
  setAvailableFeatures(ComputeAvailableFeatures(FeatureBits));

  ParserOptions = ParserOptionsStack.pop_back_val();

  return false;
}

std::unique_ptr<RISCVOperand> defaultMaskRegOp() const;

211public:
enum RISCVMatchResultTy {
  Match_Dummy = FIRST_TARGET_MATCH_RESULT_TY,
214#define GET_OPERAND_DIAGNOSTIC_TYPES
215#include "RISCVGenAsmMatcher.inc"
216#undef GET_OPERAND_DIAGNOSTIC_TYPES
};

static bool classifySymbolRef(const MCExpr *Expr,
                              RISCVMCExpr::VariantKind &Kind,
                              int64_t &Addend);

RISCVAsmParser(const MCSubtargetInfo &STI, MCAsmParser &Parser,
               const MCInstrInfo &MII, const MCTargetOptions &Options)
    : MCTargetAsmParser(Options, STI, MII) {
  Parser.addAliasForDirective(".half", ".2byte");
  Parser.addAliasForDirective(".hword", ".2byte");
  Parser.addAliasForDirective(".word", ".4byte");
  Parser.addAliasForDirective(".dword", ".8byte");
  setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));

  auto ABIName = StringRef(Options.ABIName);
  if (ABIName.endswith("f") &&
      !getSTI().getFeatureBits()[RISCV::FeatureStdExtF]) {
    errs() << "Hard-float 'f' ABI can't be used for a target that "
              "doesn't support the F instruction set extension (ignoring "
              "target-abi)\n";
  } else if (ABIName.endswith("d") &&
             !getSTI().getFeatureBits()[RISCV::FeatureStdExtD]) {
    errs() << "Hard-float 'd' ABI can't be used for a target that "
              "doesn't support the D instruction set extension (ignoring "
              "target-abi)\n";
  }

  const MCObjectFileInfo *MOFI = Parser.getContext().getObjectFileInfo();
  ParserOptions.IsPicEnabled = MOFI->isPositionIndependent();
}
248};

250/// RISCVOperand - Instances of this class represent a parsed machine
251/// instruction
252struct RISCVOperand : public MCParsedAsmOperand {

enum class KindTy {
  Token,
  Register,
  Immediate,
  SystemRegister,
  VType,
} Kind;

bool IsRV64;

struct RegOp {
  Register RegNum;
};

struct ImmOp {
  const MCExpr *Val;
};

struct SysRegOp {
  const char *Data;
  unsigned Length;
  unsigned Encoding;
  // FIXME: Add the Encoding parsed fields as needed for checks,
  // e.g.: read/write or user/supervisor/machine privileges.
};

enum class VSEW {
  SEW_8 = 0,
  SEW_16,
  SEW_32,
  SEW_64,
  SEW_128,
  SEW_256,
  SEW_512,
  SEW_1024,
};

enum class VLMUL {
  LMUL_1 = 0,
  LMUL_2,
  LMUL_4,
  LMUL_8,
  LMUL_F8 = 5,
  LMUL_F4,
  LMUL_F2
};

struct VTypeOp {
  VSEW Sew;
  VLMUL Lmul;
  bool TailAgnostic;
  bool MaskedoffAgnostic;
  unsigned Encoding;
};

SMLoc StartLoc, EndLoc;
union {
  StringRef Tok;
  RegOp Reg;
  ImmOp Imm;
  struct SysRegOp SysReg;
  struct VTypeOp VType;
};

RISCVOperand(KindTy K) : MCParsedAsmOperand(), Kind(K) {}

320public:
RISCVOperand(const RISCVOperand &o) : MCParsedAsmOperand() {
  Kind = o.Kind;
  IsRV64 = o.IsRV64;
  StartLoc = o.StartLoc;
  EndLoc = o.EndLoc;
  switch (Kind) {
  case KindTy::Register:
    Reg = o.Reg;
    break;
  case KindTy::Immediate:
    Imm = o.Imm;
    break;
  case KindTy::Token:
    Tok = o.Tok;
    break;
  case KindTy::SystemRegister:
    SysReg = o.SysReg;
    break;
  case KindTy::VType:
    VType = o.VType;
    break;
  }
}

bool isToken() const override { return Kind == KindTy::Token; }
bool isReg() const override { return Kind == KindTy::Register; }
bool isV0Reg() const {
  return Kind == KindTy::Register && Reg.RegNum == RISCV::V0;
}
bool isImm() const override { return Kind == KindTy::Immediate; }
bool isMem() const override { return false; }
bool isSystemRegister() const { return Kind == KindTy::SystemRegister; }
bool isVType() const { return Kind == KindTy::VType; }

bool isGPR() const {
  return Kind == KindTy::Register &&
         RISCVMCRegisterClasses[RISCV::GPRRegClassID].contains(Reg.RegNum);
}

static bool evaluateConstantImm(const MCExpr *Expr, int64_t &Imm,
                                RISCVMCExpr::VariantKind &VK) {
  if (auto *RE = dyn_cast<RISCVMCExpr>(Expr)) {
    VK = RE->getKind();
    return RE->evaluateAsConstant(Imm);
  }

  if (auto CE = dyn_cast<MCConstantExpr>(Expr)) {
    VK = RISCVMCExpr::VK_RISCV_None;
    Imm = CE->getValue();
    return true;
  }

  return false;
}

// True if operand is a symbol with no modifiers, or a constant with no
// modifiers and isShiftedInt<N-1, 1>(Op).
template <int N> bool isBareSimmNLsb0() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  bool IsValid;
  if (!IsConstantImm)
    IsValid = RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm);
  else
    IsValid = isShiftedInt<N - 1, 1>(Imm);
  return IsValid && VK == RISCVMCExpr::VK_RISCV_None;
}

// Predicate methods for AsmOperands defined in RISCVInstrInfo.td

bool isBareSymbol() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  // Must be of 'immediate' type but not a constant.
  if (!isImm() || evaluateConstantImm(getImm(), Imm, VK))
    return false;
  return RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isCallSymbol() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  // Must be of 'immediate' type but not a constant.
  if (!isImm() || evaluateConstantImm(getImm(), Imm, VK))
    return false;
  return RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm) &&
         (VK == RISCVMCExpr::VK_RISCV_CALL ||
          VK == RISCVMCExpr::VK_RISCV_CALL_PLT);
}

bool isPseudoJumpSymbol() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  // Must be of 'immediate' type but not a constant.
  if (!isImm() || evaluateConstantImm(getImm(), Imm, VK))
    return false;
  return RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm) &&
         VK == RISCVMCExpr::VK_RISCV_CALL;
}

bool isTPRelAddSymbol() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  // Must be of 'immediate' type but not a constant.
  if (!isImm() || evaluateConstantImm(getImm(), Imm, VK))
    return false;
  return RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm) &&
         VK == RISCVMCExpr::VK_RISCV_TPREL_ADD;
}

bool isCSRSystemRegister() const { return isSystemRegister(); }

bool isVTypeI() const { return isVType(); }

/// Return true if the operand is a valid for the fence instruction e.g.
/// ('iorw').
bool isFenceArg() const {
  if (!isImm())
    return false;
  const MCExpr *Val = getImm();
  auto *SVal = dyn_cast<MCSymbolRefExpr>(Val);
  if (!SVal || SVal->getKind() != MCSymbolRefExpr::VK_None)
    return false;

  StringRef Str = SVal->getSymbol().getName();
  // Letters must be unique, taken from 'iorw', and in ascending order. This
  // holds as long as each individual character is one of 'iorw' and is
  // greater than the previous character.
  char Prev = '\0';
  for (char c : Str) {
    if (c != 'i' && c != 'o' && c != 'r' && c != 'w')
      return false;
    if (c <= Prev)
      return false;
    Prev = c;
  }
  return true;
}

/// Return true if the operand is a valid floating point rounding mode.
bool isFRMArg() const {
  if (!isImm())
    return false;
  const MCExpr *Val = getImm();
  auto *SVal = dyn_cast<MCSymbolRefExpr>(Val);
  if (!SVal || SVal->getKind() != MCSymbolRefExpr::VK_None)
    return false;

  StringRef Str = SVal->getSymbol().getName();

  return RISCVFPRndMode::stringToRoundingMode(Str) != RISCVFPRndMode::Invalid;
}

bool isImmXLenLI() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  if (VK == RISCVMCExpr::VK_RISCV_LO || VK == RISCVMCExpr::VK_RISCV_PCREL_LO)
    return true;
  // Given only Imm, ensuring that the actually specified constant is either
  // a signed or unsigned 64-bit number is unfortunately impossible.
  return IsConstantImm && VK == RISCVMCExpr::VK_RISCV_None &&
         (isRV64() || (isInt<32>(Imm) || isUInt<32>(Imm)));
}

bool isUImmLog2XLen() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  if (!evaluateConstantImm(getImm(), Imm, VK) ||
      VK != RISCVMCExpr::VK_RISCV_None)
    return false;
  return (isRV64() && isUInt<6>(Imm)) || isUInt<5>(Imm);
}

bool isUImmLog2XLenNonZero() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  if (!evaluateConstantImm(getImm(), Imm, VK) ||
      VK != RISCVMCExpr::VK_RISCV_None)
    return false;
  if (Imm == 0)
    return false;
  return (isRV64() && isUInt<6>(Imm)) || isUInt<5>(Imm);
}

bool isUImmLog2XLenHalf() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  if (!evaluateConstantImm(getImm(), Imm, VK) ||
      VK != RISCVMCExpr::VK_RISCV_None)
    return false;
  return (isRV64() && isUInt<5>(Imm)) || isUInt<4>(Imm);
}

bool isUImm5() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isUInt<5>(Imm) && VK == RISCVMCExpr::VK_RISCV_None;
}

bool isUImm5NonZero() const {
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isUInt<5>(Imm) && (Imm != 0) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isSImm5() const {
  if (!isImm())
    return false;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isInt<5>(Imm) && VK == RISCVMCExpr::VK_RISCV_None;
}

bool isSImm6() const {
  if (!isImm())
    return false;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isInt<6>(Imm) &&
   VK == RISCVMCExpr::VK_RISCV_None;
}

bool isSImm6NonZero() const {
  if (!isImm())
    return false;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isInt<6>(Imm) && (Imm != 0) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isCLUIImm() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && (Imm != 0) &&
         (isUInt<5>(Imm) || (Imm >= 0xfffe0 && Imm <= 0xfffff)) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isUImm7Lsb00() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isShiftedUInt<5, 2>(Imm) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isUImm8Lsb00() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isShiftedUInt<6, 2>(Imm) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isUImm8Lsb000() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isShiftedUInt<5, 3>(Imm) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isSImm9Lsb0() const { return isBareSimmNLsb0<9>(); }

bool isUImm9Lsb000() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isShiftedUInt<6, 3>(Imm) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isUImm10Lsb00NonZero() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isShiftedUInt<8, 2>(Imm) && (Imm != 0) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isSImm12() const {
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsValid;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  if (!IsConstantImm)
    IsValid = RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm);
  else
    IsValid = isInt<12>(Imm);
  return IsValid && ((IsConstantImm && VK == RISCVMCExpr::VK_RISCV_None) ||
                     VK == RISCVMCExpr::VK_RISCV_LO ||
                     VK == RISCVMCExpr::VK_RISCV_PCREL_LO ||
                     VK == RISCVMCExpr::VK_RISCV_TPREL_LO);
}

bool isSImm12Lsb0() const { return isBareSimmNLsb0<12>(); }

bool isSImm13Lsb0() const { return isBareSimmNLsb0<13>(); }

bool isSImm10Lsb0000NonZero() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && (Imm != 0) && isShiftedInt<6, 4>(Imm) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

bool isUImm20LUI() const {
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsValid;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  if (!IsConstantImm) {
    IsValid = RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm);
    return IsValid && (VK == RISCVMCExpr::VK_RISCV_HI ||
                       VK == RISCVMCExpr::VK_RISCV_TPREL_HI);
  } else {
    return isUInt<20>(Imm) && (VK == RISCVMCExpr::VK_RISCV_None ||
                               VK == RISCVMCExpr::VK_RISCV_HI ||
                               VK == RISCVMCExpr::VK_RISCV_TPREL_HI);
  }
}

bool isUImm20AUIPC() const {
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsValid;
  if (!isImm())
    return false;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  if (!IsConstantImm) {
    IsValid = RISCVAsmParser::classifySymbolRef(getImm(), VK, Imm);
    return IsValid && (VK == RISCVMCExpr::VK_RISCV_PCREL_HI ||
                       VK == RISCVMCExpr::VK_RISCV_GOT_HI ||
                       VK == RISCVMCExpr::VK_RISCV_TLS_GOT_HI ||
                       VK == RISCVMCExpr::VK_RISCV_TLS_GD_HI);
  } else {
    return isUInt<20>(Imm) && (VK == RISCVMCExpr::VK_RISCV_None ||
                               VK == RISCVMCExpr::VK_RISCV_PCREL_HI ||
                               VK == RISCVMCExpr::VK_RISCV_GOT_HI ||
                               VK == RISCVMCExpr::VK_RISCV_TLS_GOT_HI ||
                               VK == RISCVMCExpr::VK_RISCV_TLS_GD_HI);
  }
}

bool isSImm21Lsb0JAL() const { return isBareSimmNLsb0<21>(); }

bool isImmZero() const {
  if (!isImm())
    return false;
  int64_t Imm;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && (Imm == 0) && VK == RISCVMCExpr::VK_RISCV_None;
}

bool isSImm5Plus1() const {
  if (!isImm())
    return false;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  int64_t Imm;
  bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
  return IsConstantImm && isInt<5>(Imm - 1) &&
         VK == RISCVMCExpr::VK_RISCV_None;
}

/// getStartLoc - Gets location of the first token of this operand
SMLoc getStartLoc() const override { return StartLoc; }
/// getEndLoc - Gets location of the last token of this operand
SMLoc getEndLoc() const override { return EndLoc; }
/// True if this operand is for an RV64 instruction
bool isRV64() const { return IsRV64; }

unsigned getReg() const override {
  assert(Kind == KindTy::Register && "Invalid type access!")((Kind == KindTy::Register && "Invalid type access!")
 ? static_cast<void> (0) : __assert_fail ("Kind == KindTy::Register && \"Invalid type access!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 738, __PRETTY_FUNCTION__));
  return Reg.RegNum.id();
}

StringRef getSysReg() const {
  assert(Kind == KindTy::SystemRegister && "Invalid access!")((Kind == KindTy::SystemRegister && "Invalid access!"
) ? static_cast<void> (0) : __assert_fail ("Kind == KindTy::SystemRegister && \"Invalid access!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 743, __PRETTY_FUNCTION__));
  return StringRef(SysReg.Data, SysReg.Length);
}

const MCExpr *getImm() const {
  assert(Kind == KindTy::Immediate && "Invalid type access!")((Kind == KindTy::Immediate && "Invalid type access!"
) ? static_cast<void> (0) : __assert_fail ("Kind == KindTy::Immediate && \"Invalid type access!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 748, __PRETTY_FUNCTION__));
  return Imm.Val;
}

StringRef getToken() const {
  assert(Kind == KindTy::Token && "Invalid type access!")((Kind == KindTy::Token && "Invalid type access!") ? static_cast
<void> (0) : __assert_fail ("Kind == KindTy::Token && \"Invalid type access!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 753, __PRETTY_FUNCTION__));
  return Tok;
}

static StringRef getSEWStr(VSEW Sew) {
  switch (Sew) {
  case VSEW::SEW_8:
    return "e8";
  case VSEW::SEW_16:
    return "e16";
  case VSEW::SEW_32:
    return "e32";
  case VSEW::SEW_64:
    return "e64";
  case VSEW::SEW_128:
    return "e128";
  case VSEW::SEW_256:
    return "e256";
  case VSEW::SEW_512:
    return "e512";
  case VSEW::SEW_1024:
    return "e1024";
  }
  llvm_unreachable("Unknown SEW.")::llvm::llvm_unreachable_internal("Unknown SEW.", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 776);
}

static StringRef getLMULStr(VLMUL Lmul) {
  switch (Lmul) {
  case VLMUL::LMUL_1:
    return "m1";
  case VLMUL::LMUL_2:
    return "m2";
  case VLMUL::LMUL_4:
    return "m4";
  case VLMUL::LMUL_8:
    return "m8";
  case VLMUL::LMUL_F2:
    return "mf2";
  case VLMUL::LMUL_F4:
    return "mf4";
  case VLMUL::LMUL_F8:
    return "mf8";
  }
  llvm_unreachable("Unknown LMUL.")::llvm::llvm_unreachable_internal("Unknown LMUL.", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 796);
}

StringRef getVType(SmallString<32> &Buf) const {
  assert(Kind == KindTy::VType && "Invalid access!")((Kind == KindTy::VType && "Invalid access!") ? static_cast
<void> (0) : __assert_fail ("Kind == KindTy::VType && \"Invalid access!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 800, __PRETTY_FUNCTION__));
  Buf.append(getSEWStr(VType.Sew));
  Buf.append(",");
  Buf.append(getLMULStr(VType.Lmul));

  return Buf.str();
}

void print(raw_ostream &OS) const override {
  switch (Kind) {
  case KindTy::Immediate:
    OS << *getImm();
    break;
  case KindTy::Register:
    OS << "<register x";
    OS << getReg() << ">";
    break;
  case KindTy::Token:
    OS << "'" << getToken() << "'";
    break;
  case KindTy::SystemRegister:
    OS << "<sysreg: " << getSysReg() << '>';
    break;
  case KindTy::VType:
    SmallString<32> VTypeBuf;
    OS << "<vtype: " << getVType(VTypeBuf) << '>';
    break;
  }
}

static std::unique_ptr<RISCVOperand> createToken(StringRef Str, SMLoc S,
                                                 bool IsRV64) {
  auto Op = std::make_unique<RISCVOperand>(KindTy::Token);
  Op->Tok = Str;
  Op->StartLoc = S;
  Op->EndLoc = S;
  Op->IsRV64 = IsRV64;
  return Op;
}

static std::unique_ptr<RISCVOperand> createReg(unsigned RegNo, SMLoc S,
                                               SMLoc E, bool IsRV64) {
  auto Op = std::make_unique<RISCVOperand>(KindTy::Register);
  Op->Reg.RegNum = RegNo;
  Op->StartLoc = S;
  Op->EndLoc = E;
  Op->IsRV64 = IsRV64;
  return Op;
}

static std::unique_ptr<RISCVOperand> createImm(const MCExpr *Val, SMLoc S,
                                               SMLoc E, bool IsRV64) {
  auto Op = std::make_unique<RISCVOperand>(KindTy::Immediate);
  Op->Imm.Val = Val;
  Op->StartLoc = S;
  Op->EndLoc = E;
  Op->IsRV64 = IsRV64;
  return Op;
}

static std::unique_ptr<RISCVOperand>
createSysReg(StringRef Str, SMLoc S, unsigned Encoding, bool IsRV64) {
  auto Op = std::make_unique<RISCVOperand>(KindTy::SystemRegister);
  Op->SysReg.Data = Str.data();
  Op->SysReg.Length = Str.size();
  Op->SysReg.Encoding = Encoding;
  Op->StartLoc = S;
  Op->IsRV64 = IsRV64;
  return Op;
}

static std::unique_ptr<RISCVOperand>
createVType(APInt Sew, APInt Lmul, bool Fractional, bool TailAgnostic,
            bool MaskedoffAgnostic, SMLoc S, bool IsRV64) {
  auto Op = std::make_unique<RISCVOperand>(KindTy::VType);
  Sew.ashrInPlace(3);
  unsigned SewLog2 = Sew.logBase2();
  unsigned LmulLog2 = Lmul.logBase2();
  Op->VType.Sew = static_cast<VSEW>(SewLog2);
  if (Fractional) {
    unsigned Flmul = 8 - LmulLog2;
    Op->VType.Lmul = static_cast<VLMUL>(Flmul);
    Op->VType.Encoding =
        ((Flmul & 0x4) << 3) | ((SewLog2 & 0x7) << 2) | (Flmul & 0x3);
  } else {
    Op->VType.Lmul = static_cast<VLMUL>(LmulLog2);
    Op->VType.Encoding = (SewLog2 << 2) | LmulLog2;
  }
  if (TailAgnostic) {
    Op->VType.Encoding |= 0x40;
  }
  if (MaskedoffAgnostic) {
    Op->VType.Encoding |= 0x80;
  }
  Op->VType.TailAgnostic = TailAgnostic;
  Op->VType.MaskedoffAgnostic = MaskedoffAgnostic;
  Op->StartLoc = S;
  Op->IsRV64 = IsRV64;
  return Op;
}

void addExpr(MCInst &Inst, const MCExpr *Expr) const {
  assert(Expr && "Expr shouldn't be null!")((Expr && "Expr shouldn't be null!") ? static_cast<
void> (0) : __assert_fail ("Expr && \"Expr shouldn't be null!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 902, __PRETTY_FUNCTION__));
  int64_t Imm = 0;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstant = evaluateConstantImm(Expr, Imm, VK);

  if (IsConstant)
    Inst.addOperand(MCOperand::createImm(Imm));
  else
    Inst.addOperand(MCOperand::createExpr(Expr));
}

// Used by the TableGen Code
void addRegOperands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 915, __PRETTY_FUNCTION__));
  Inst.addOperand(MCOperand::createReg(getReg()));
}

void addImmOperands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 920, __PRETTY_FUNCTION__));
  addExpr(Inst, getImm());
}

void addSImm5Plus1Operands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 925, __PRETTY_FUNCTION__));
  int64_t Imm = 0;
  RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
  bool IsConstant = evaluateConstantImm(getImm(), Imm, VK);
  assert(IsConstant && "Expect constant value!")((IsConstant && "Expect constant value!") ? static_cast
<void> (0) : __assert_fail ("IsConstant && \"Expect constant value!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 929, __PRETTY_FUNCTION__));
  (void)IsConstant;
  Inst.addOperand(MCOperand::createImm(Imm - 1));
}

void addFenceArgOperands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 935, __PRETTY_FUNCTION__));
  // isFenceArg has validated the operand, meaning this cast is safe
  auto SE = cast<MCSymbolRefExpr>(getImm());

  unsigned Imm = 0;
  for (char c : SE->getSymbol().getName()) {
    switch (c) {
    default:
      llvm_unreachable("FenceArg must contain only [iorw]")::llvm::llvm_unreachable_internal("FenceArg must contain only [iorw]"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 943);
    case 'i': Imm |= RISCVFenceField::I; break;
    case 'o': Imm |= RISCVFenceField::O; break;
    case 'r': Imm |= RISCVFenceField::R; break;
    case 'w': Imm |= RISCVFenceField::W; break;
    }
  }
  Inst.addOperand(MCOperand::createImm(Imm));
}

void addCSRSystemRegisterOperands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 954, __PRETTY_FUNCTION__));
  Inst.addOperand(MCOperand::createImm(SysReg.Encoding));
}

void addVTypeIOperands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 959, __PRETTY_FUNCTION__));
  Inst.addOperand(MCOperand::createImm(VType.Encoding));
}

// Returns the rounding mode represented by this RISCVOperand. Should only
// be called after checking isFRMArg.
RISCVFPRndMode::RoundingMode getRoundingMode() const {
  // isFRMArg has validated the operand, meaning this cast is safe.
  auto SE = cast<MCSymbolRefExpr>(getImm());
  RISCVFPRndMode::RoundingMode FRM =
      RISCVFPRndMode::stringToRoundingMode(SE->getSymbol().getName());
  assert(FRM != RISCVFPRndMode::Invalid && "Invalid rounding mode")((FRM != RISCVFPRndMode::Invalid && "Invalid rounding mode"
) ? static_cast<void> (0) : __assert_fail ("FRM != RISCVFPRndMode::Invalid && \"Invalid rounding mode\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 970, __PRETTY_FUNCTION__));
  return FRM;
}

void addFRMArgOperands(MCInst &Inst, unsigned N) const {
  assert(N == 1 && "Invalid number of operands!")((N == 1 && "Invalid number of operands!") ? static_cast
<void> (0) : __assert_fail ("N == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 975, __PRETTY_FUNCTION__));
  Inst.addOperand(MCOperand::createImm(getRoundingMode()));
}
978};
979} // end anonymous namespace.

981#define GET_REGISTER_MATCHER
982#define GET_SUBTARGET_FEATURE_NAME
983#define GET_MATCHER_IMPLEMENTATION
984#define GET_MNEMONIC_SPELL_CHECKER
985#include "RISCVGenAsmMatcher.inc"

987static Register convertFPR64ToFPR32(Register Reg) {
assert(Reg >= RISCV::F0_D && Reg <= RISCV::F31_D && "Invalid register")((Reg >= RISCV::F0_D && Reg <= RISCV::F31_D &&
 "Invalid register") ? static_cast<void> (0) : __assert_fail
 ("Reg >= RISCV::F0_D && Reg <= RISCV::F31_D && \"Invalid register\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 988, __PRETTY_FUNCTION__));
return Reg - RISCV::F0_D + RISCV::F0_F;
990}

992unsigned RISCVAsmParser::validateTargetOperandClass(MCParsedAsmOperand &AsmOp,
                                                  unsigned Kind) {
RISCVOperand &Op = static_cast<RISCVOperand &>(AsmOp);
if (!Op.isReg())
  return Match_InvalidOperand;

Register Reg = Op.getReg();
bool IsRegFPR64 =
    RISCVMCRegisterClasses[RISCV::FPR64RegClassID].contains(Reg);
bool IsRegFPR64C =
    RISCVMCRegisterClasses[RISCV::FPR64CRegClassID].contains(Reg);

// As the parser couldn't differentiate an FPR32 from an FPR64, coerce the
// register from FPR64 to FPR32 or FPR64C to FPR32C if necessary.
if ((IsRegFPR64 && Kind == MCK_FPR32) ||
    (IsRegFPR64C && Kind == MCK_FPR32C)) {
  Op.Reg.RegNum = convertFPR64ToFPR32(Reg);
  return Match_Success;
}
return Match_InvalidOperand;
1012}

1014bool RISCVAsmParser::generateImmOutOfRangeError(
  OperandVector &Operands, uint64_t ErrorInfo, int64_t Lower, int64_t Upper,
  Twine Msg = "immediate must be an integer in the range") {
SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
return Error(ErrorLoc, Msg + " [" + Twine(Lower) + ", " + Twine(Upper) + "]");
1019}

1021static std::string RISCVMnemonicSpellCheck(StringRef S,
                                        const FeatureBitset &FBS,
                                        unsigned VariantID = 0);

1025bool RISCVAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
                                           OperandVector &Operands,
                                           MCStreamer &Out,
                                           uint64_t &ErrorInfo,
                                           bool MatchingInlineAsm) {
MCInst Inst;
FeatureBitset MissingFeatures;

auto Result =
  MatchInstructionImpl(Operands, Inst, ErrorInfo, MissingFeatures,
                       MatchingInlineAsm);
switch (Result) {
default:
  break;
case Match_Success:
  if (validateInstruction(Inst, Operands))
    return true;
  return processInstruction(Inst, IDLoc, Operands, Out);
case Match_MissingFeature: {
  assert(MissingFeatures.any() && "Unknown missing features!")((MissingFeatures.any() && "Unknown missing features!"
) ? static_cast<void> (0) : __assert_fail ("MissingFeatures.any() && \"Unknown missing features!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 1044, __PRETTY_FUNCTION__));
  bool FirstFeature = true;
  std::string Msg = "instruction requires the following:";
  for (unsigned i = 0, e = MissingFeatures.size(); i != e; ++i) {
    if (MissingFeatures[i]) {
      Msg += FirstFeature ? " " : ", ";
      Msg += getSubtargetFeatureName(i);
      FirstFeature = false;
    }
  }
  return Error(IDLoc, Msg);
}
case Match_MnemonicFail: {
  FeatureBitset FBS = ComputeAvailableFeatures(getSTI().getFeatureBits());
  std::string Suggestion = RISCVMnemonicSpellCheck(
    ((RISCVOperand &)*Operands[0]).getToken(), FBS);
  return Error(IDLoc, "unrecognized instruction mnemonic" + Suggestion);
}
case Match_InvalidOperand: {
  SMLoc ErrorLoc = IDLoc;
  if (ErrorInfo != ~0U) {
    if (ErrorInfo >= Operands.size())
      return Error(ErrorLoc, "too few operands for instruction");

    ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
    if (ErrorLoc == SMLoc())
      ErrorLoc = IDLoc;
  }
  return Error(ErrorLoc, "invalid operand for instruction");
}
}

// Handle the case when the error message is of specific type
// other than the generic Match_InvalidOperand, and the
// corresponding operand is missing.
if (Result > FIRST_TARGET_MATCH_RESULT_TY) {
  SMLoc ErrorLoc = IDLoc;
  if (ErrorInfo != ~0U && ErrorInfo >= Operands.size())
      return Error(ErrorLoc, "too few operands for instruction");
}

switch(Result) {
default:
  break;
case Match_InvalidImmXLenLI:
  if (isRV64()) {
    SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
    return Error(ErrorLoc, "operand must be a constant 64-bit integer");
  }
  return generateImmOutOfRangeError(Operands, ErrorInfo,
                                    std::numeric_limits<int32_t>::min(),
                                    std::numeric_limits<uint32_t>::max());
case Match_InvalidImmZero: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(ErrorLoc, "immediate must be zero");
}
case Match_InvalidUImmLog2XLen:
  if (isRV64())
    return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 6) - 1);
  return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 5) - 1);
case Match_InvalidUImmLog2XLenNonZero:
  if (isRV64())
    return generateImmOutOfRangeError(Operands, ErrorInfo, 1, (1 << 6) - 1);
  return generateImmOutOfRangeError(Operands, ErrorInfo, 1, (1 << 5) - 1);
case Match_InvalidUImmLog2XLenHalf:
  if (isRV64())
    return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 5) - 1);
  return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 4) - 1);
case Match_InvalidUImm5:
  return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 5) - 1);
case Match_InvalidSImm6:
  return generateImmOutOfRangeError(Operands, ErrorInfo, -(1 << 5),
                                    (1 << 5) - 1);
case Match_InvalidSImm6NonZero:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 5), (1 << 5) - 1,
      "immediate must be non-zero in the range");
case Match_InvalidCLUIImm:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 1, (1 << 5) - 1,
      "immediate must be in [0xfffe0, 0xfffff] or");
case Match_InvalidUImm7Lsb00:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 0, (1 << 7) - 4,
      "immediate must be a multiple of 4 bytes in the range");
case Match_InvalidUImm8Lsb00:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 0, (1 << 8) - 4,
      "immediate must be a multiple of 4 bytes in the range");
case Match_InvalidUImm8Lsb000:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 0, (1 << 8) - 8,
      "immediate must be a multiple of 8 bytes in the range");
case Match_InvalidSImm9Lsb0:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 8), (1 << 8) - 2,
      "immediate must be a multiple of 2 bytes in the range");
case Match_InvalidUImm9Lsb000:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 0, (1 << 9) - 8,
      "immediate must be a multiple of 8 bytes in the range");
case Match_InvalidUImm10Lsb00NonZero:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 4, (1 << 10) - 4,
      "immediate must be a multiple of 4 bytes in the range");
case Match_InvalidSImm10Lsb0000NonZero:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 9), (1 << 9) - 16,
      "immediate must be a multiple of 16 bytes and non-zero in the range");
case Match_InvalidSImm12:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 11), (1 << 11) - 1,
      "operand must be a symbol with %lo/%pcrel_lo/%tprel_lo modifier or an "
      "integer in the range");
case Match_InvalidSImm12Lsb0:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 11), (1 << 11) - 2,
      "immediate must be a multiple of 2 bytes in the range");
case Match_InvalidSImm13Lsb0:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 12), (1 << 12) - 2,
      "immediate must be a multiple of 2 bytes in the range");
case Match_InvalidUImm20LUI:
  return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 20) - 1,
                                    "operand must be a symbol with "
                                    "%hi/%tprel_hi modifier or an integer in "
                                    "the range");
case Match_InvalidUImm20AUIPC:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, 0, (1 << 20) - 1,
      "operand must be a symbol with a "
      "%pcrel_hi/%got_pcrel_hi/%tls_ie_pcrel_hi/%tls_gd_pcrel_hi modifier or "
      "an integer in the range");
case Match_InvalidSImm21Lsb0JAL:
  return generateImmOutOfRangeError(
      Operands, ErrorInfo, -(1 << 20), (1 << 20) - 2,
      "immediate must be a multiple of 2 bytes in the range");
case Match_InvalidCSRSystemRegister: {
  return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 12) - 1,
                                    "operand must be a valid system register "
                                    "name or an integer in the range");
}
case Match_InvalidFenceArg: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(
      ErrorLoc,
      "operand must be formed of letters selected in-order from 'iorw'");
}
case Match_InvalidFRMArg: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(
      ErrorLoc,
      "operand must be a valid floating point rounding mode mnemonic");
}
case Match_InvalidBareSymbol: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(ErrorLoc, "operand must be a bare symbol name");
}
case Match_InvalidPseudoJumpSymbol: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(ErrorLoc, "operand must be a valid jump target");
}
case Match_InvalidCallSymbol: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(ErrorLoc, "operand must be a bare symbol name");
}
case Match_InvalidTPRelAddSymbol: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(ErrorLoc, "operand must be a symbol with %tprel_add modifier");
}
case Match_InvalidVTypeI: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(
      ErrorLoc,
      "operand must be "
      "e[8|16|32|64|128|256|512|1024],m[1|2|4|8|f2|f4|f8],[ta|tu],[ma|mu]");
}
case Match_InvalidVMaskRegister: {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[ErrorInfo]).getStartLoc();
  return Error(ErrorLoc, "operand must be v0.t");
}
case Match_InvalidSImm5Plus1: {
  return generateImmOutOfRangeError(Operands, ErrorInfo, -(1 << 4) + 1,
                                    (1 << 4),
                                    "immediate must be in the range");
}
}

llvm_unreachable("Unknown match type detected!")::llvm::llvm_unreachable_internal("Unknown match type detected!"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 1232);
1233}

1235// Attempts to match Name as a register (either using the default name or
1236// alternative ABI names), setting RegNo to the matching register. Upon
1237// failure, returns true and sets RegNo to 0. If IsRV32E then registers
1238// x16-x31 will be rejected.
1239static bool matchRegisterNameHelper(bool IsRV32E, Register &RegNo,
                                  StringRef Name) {
RegNo = MatchRegisterName(Name);
// The 32- and 64-bit FPRs have the same asm name. Check that the initial
// match always matches the 64-bit variant, and not the 32-bit one.
assert(!(RegNo >= RISCV::F0_F && RegNo <= RISCV::F31_F))((!(RegNo >= RISCV::F0_F && RegNo <= RISCV::F31_F
)) ? static_cast<void> (0) : __assert_fail ("!(RegNo >= RISCV::F0_F && RegNo <= RISCV::F31_F)"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 1244, __PRETTY_FUNCTION__));
// The default FPR register class is based on the tablegen enum ordering.
static_assert(RISCV::F0_D < RISCV::F0_F, "FPR matching must be updated");
if (RegNo == RISCV::NoRegister)
  RegNo = MatchRegisterAltName(Name);
if (IsRV32E && RegNo >= RISCV::X16 && RegNo <= RISCV::X31)
  RegNo = RISCV::NoRegister;
return RegNo == RISCV::NoRegister;
1252}

1254bool RISCVAsmParser::ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
                                 SMLoc &EndLoc) {
if (tryParseRegister(RegNo, StartLoc, EndLoc) != MatchOperand_Success)
  return Error(StartLoc, "invalid register name");
return false;
1259}

1261OperandMatchResultTy RISCVAsmParser::tryParseRegister(unsigned &RegNo,
                                                    SMLoc &StartLoc,
                                                    SMLoc &EndLoc) {
const AsmToken &Tok = getParser().getTok();
StartLoc = Tok.getLoc();
EndLoc = Tok.getEndLoc();
RegNo = 0;
StringRef Name = getLexer().getTok().getIdentifier();

if (matchRegisterNameHelper(isRV32E(), (Register &)RegNo, Name))
  return MatchOperand_NoMatch;

getParser().Lex(); // Eat identifier token.
return MatchOperand_Success;
1275}

1277OperandMatchResultTy RISCVAsmParser::parseRegister(OperandVector &Operands,
                                                 bool AllowParens) {
SMLoc FirstS = getLoc();
bool HadParens = false;
AsmToken LParen;

// If this is an LParen and a parenthesised register name is allowed, parse it
// atomically.
if (AllowParens && getLexer().is(AsmToken::LParen)) {
  AsmToken Buf[2];
  size_t ReadCount = getLexer().peekTokens(Buf);
  if (ReadCount == 2 && Buf[1].getKind() == AsmToken::RParen) {
    HadParens = true;
    LParen = getParser().getTok();
    getParser().Lex(); // Eat '('
  }
}

switch (getLexer().getKind()) {
default:
  if (HadParens)
    getLexer().UnLex(LParen);
  return MatchOperand_NoMatch;
case AsmToken::Identifier:
  StringRef Name = getLexer().getTok().getIdentifier();
  Register RegNo;
  matchRegisterNameHelper(isRV32E(), RegNo, Name);

  if (RegNo == RISCV::NoRegister) {
    if (HadParens)
      getLexer().UnLex(LParen);
    return MatchOperand_NoMatch;
  }
  if (HadParens)
    Operands.push_back(RISCVOperand::createToken("(", FirstS, isRV64()));
  SMLoc S = getLoc();
  SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);
  getLexer().Lex();
  Operands.push_back(RISCVOperand::createReg(RegNo, S, E, isRV64()));
}

if (HadParens) {
  getParser().Lex(); // Eat ')'
  Operands.push_back(RISCVOperand::createToken(")", getLoc(), isRV64()));
}

return MatchOperand_Success;
1324}

1326OperandMatchResultTy
1327RISCVAsmParser::parseCSRSystemRegister(OperandVector &Operands) {
SMLoc S = getLoc();
const MCExpr *Res;

switch (getLexer().getKind()) {
default:
  return MatchOperand_NoMatch;
case AsmToken::LParen:
case AsmToken::Minus:
case AsmToken::Plus:
case AsmToken::Exclaim:
case AsmToken::Tilde:
case AsmToken::Integer:
case AsmToken::String: {
  if (getParser().parseExpression(Res))
    return MatchOperand_ParseFail;

  auto *CE = dyn_cast<MCConstantExpr>(Res);
  if (CE) {
    int64_t Imm = CE->getValue();
    if (isUInt<12>(Imm)) {
      auto SysReg = RISCVSysReg::lookupSysRegByEncoding(Imm);
      // Accept an immediate representing a named or un-named Sys Reg
      // if the range is valid, regardless of the required features.
      Operands.push_back(RISCVOperand::createSysReg(
          SysReg ? SysReg->Name : "", S, Imm, isRV64()));
      return MatchOperand_Success;
    }
  }

  Twine Msg = "immediate must be an integer in the range";
  Error(S, Msg + " [" + Twine(0) + ", " + Twine((1 << 12) - 1) + "]");
  return MatchOperand_ParseFail;
}
case AsmToken::Identifier: {
  StringRef Identifier;
  if (getParser().parseIdentifier(Identifier))
    return MatchOperand_ParseFail;

  auto SysReg = RISCVSysReg::lookupSysRegByName(Identifier);
  if (!SysReg)
    SysReg = RISCVSysReg::lookupSysRegByAltName(Identifier);
  // Accept a named Sys Reg if the required features are present.
  if (SysReg) {
    if (!SysReg->haveRequiredFeatures(getSTI().getFeatureBits())) {
      Error(S, "system register use requires an option to be enabled");
      return MatchOperand_ParseFail;
    }
    Operands.push_back(RISCVOperand::createSysReg(
        Identifier, S, SysReg->Encoding, isRV64()));
    return MatchOperand_Success;
  }

  Twine Msg = "operand must be a valid system register name "
              "or an integer in the range";
  Error(S, Msg + " [" + Twine(0) + ", " + Twine((1 << 12) - 1) + "]");
  return MatchOperand_ParseFail;
}
case AsmToken::Percent: {
  // Discard operand with modifier.
  Twine Msg = "immediate must be an integer in the range";
  Error(S, Msg + " [" + Twine(0) + ", " + Twine((1 << 12) - 1) + "]");
  return MatchOperand_ParseFail;
}
}

return MatchOperand_NoMatch;
1394}

1396OperandMatchResultTy RISCVAsmParser::parseImmediate(OperandVector &Operands) {
SMLoc S = getLoc();
SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);
const MCExpr *Res;

switch (getLexer().getKind()) {
default:
  return MatchOperand_NoMatch;
case AsmToken::LParen:
case AsmToken::Dot:
case AsmToken::Minus:
case AsmToken::Plus:
case AsmToken::Exclaim:
case AsmToken::Tilde:
case AsmToken::Integer:
case AsmToken::String:
case AsmToken::Identifier:
  if (getParser().parseExpression(Res))
    return MatchOperand_ParseFail;
  break;
case AsmToken::Percent:
  return parseOperandWithModifier(Operands);
}

Operands.push_back(RISCVOperand::createImm(Res, S, E, isRV64()));
return MatchOperand_Success;
1422}

1424OperandMatchResultTy
1425RISCVAsmParser::parseOperandWithModifier(OperandVector &Operands) {
SMLoc S = getLoc();
SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);

if (getLexer().getKind() != AsmToken::Percent) {
  Error(getLoc(), "expected '%' for operand modifier");
  return MatchOperand_ParseFail;
}

getParser().Lex(); // Eat '%'

if (getLexer().getKind() != AsmToken::Identifier) {
  Error(getLoc(), "expected valid identifier for operand modifier");
  return MatchOperand_ParseFail;
}
StringRef Identifier = getParser().getTok().getIdentifier();
RISCVMCExpr::VariantKind VK = RISCVMCExpr::getVariantKindForName(Identifier);
if (VK == RISCVMCExpr::VK_RISCV_Invalid) {
  Error(getLoc(), "unrecognized operand modifier");
  return MatchOperand_ParseFail;
}

getParser().Lex(); // Eat the identifier
if (getLexer().getKind() != AsmToken::LParen) {
  Error(getLoc(), "expected '('");
  return MatchOperand_ParseFail;
}
getParser().Lex(); // Eat '('

const MCExpr *SubExpr;
if (getParser().parseParenExpression(SubExpr, E)) {
  return MatchOperand_ParseFail;
}

const MCExpr *ModExpr = RISCVMCExpr::create(SubExpr, VK, getContext());
Operands.push_back(RISCVOperand::createImm(ModExpr, S, E, isRV64()));
return MatchOperand_Success;
1462}

1464OperandMatchResultTy RISCVAsmParser::parseBareSymbol(OperandVector &Operands) {
SMLoc S = getLoc();
SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);
const MCExpr *Res;

if (getLexer().getKind() != AsmToken::Identifier)
  return MatchOperand_NoMatch;

StringRef Identifier;
AsmToken Tok = getLexer().getTok();

if (getParser().parseIdentifier(Identifier))
  return MatchOperand_ParseFail;

if (Identifier.consume_back("@plt")) {
  Error(getLoc(), "'@plt' operand not valid for instruction");
  return MatchOperand_ParseFail;
}

MCSymbol *Sym = getContext().getOrCreateSymbol(Identifier);

if (Sym->isVariable()) {
  const MCExpr *V = Sym->getVariableValue(/*SetUsed=*/false);
  if (!isa<MCSymbolRefExpr>(V)) {
    getLexer().UnLex(Tok); // Put back if it's not a bare symbol.
    return MatchOperand_NoMatch;
  }
  Res = V;
} else
  Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());

MCBinaryExpr::Opcode Opcode;
switch (getLexer().getKind()) {
default:
  Operands.push_back(RISCVOperand::createImm(Res, S, E, isRV64()));
  return MatchOperand_Success;
case AsmToken::Plus:
  Opcode = MCBinaryExpr::Add;
  break;
case AsmToken::Minus:
  Opcode = MCBinaryExpr::Sub;
  break;
}

const MCExpr *Expr;
if (getParser().parseExpression(Expr))
  return MatchOperand_ParseFail;
Res = MCBinaryExpr::create(Opcode, Res, Expr, getContext());
Operands.push_back(RISCVOperand::createImm(Res, S, E, isRV64()));
return MatchOperand_Success;
1514}

1516OperandMatchResultTy RISCVAsmParser::parseCallSymbol(OperandVector &Operands) {
SMLoc S = getLoc();
SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);
const MCExpr *Res;

if (getLexer().getKind() != AsmToken::Identifier)
  return MatchOperand_NoMatch;

// Avoid parsing the register in `call rd, foo` as a call symbol.
if (getLexer().peekTok().getKind() != AsmToken::EndOfStatement)
  return MatchOperand_NoMatch;

StringRef Identifier;
if (getParser().parseIdentifier(Identifier))
  return MatchOperand_ParseFail;

RISCVMCExpr::VariantKind Kind = RISCVMCExpr::VK_RISCV_CALL;
if (Identifier.consume_back("@plt"))
  Kind = RISCVMCExpr::VK_RISCV_CALL_PLT;

MCSymbol *Sym = getContext().getOrCreateSymbol(Identifier);
Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
Res = RISCVMCExpr::create(Res, Kind, getContext());
Operands.push_back(RISCVOperand::createImm(Res, S, E, isRV64()));
return MatchOperand_Success;
1541}

1543OperandMatchResultTy
1544RISCVAsmParser::parsePseudoJumpSymbol(OperandVector &Operands) {
SMLoc S = getLoc();
SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);
const MCExpr *Res;

if (getParser().parseExpression(Res))
  return MatchOperand_ParseFail;

if (Res->getKind() != MCExpr::ExprKind::SymbolRef ||
    cast<MCSymbolRefExpr>(Res)->getKind() ==
        MCSymbolRefExpr::VariantKind::VK_PLT) {
  Error(S, "operand must be a valid jump target");
  return MatchOperand_ParseFail;
}

Res = RISCVMCExpr::create(Res, RISCVMCExpr::VK_RISCV_CALL, getContext());
Operands.push_back(RISCVOperand::createImm(Res, S, E, isRV64()));
return MatchOperand_Success;
1562}

1564OperandMatchResultTy RISCVAsmParser::parseJALOffset(OperandVector &Operands) {
// Parsing jal operands is fiddly due to the `jal foo` and `jal ra, foo`
// both being acceptable forms. When parsing `jal ra, foo` this function
// will be called for the `ra` register operand in an attempt to match the
// single-operand alias. parseJALOffset must fail for this case. It would
// seem logical to try parse the operand using parseImmediate and return
// NoMatch if the next token is a comma (meaning we must be parsing a jal in
// the second form rather than the first). We can't do this as there's no
// way of rewinding the lexer state. Instead, return NoMatch if this operand
// is an identifier and is followed by a comma.
if (getLexer().is(AsmToken::Identifier) &&
    getLexer().peekTok().is(AsmToken::Comma))
  return MatchOperand_NoMatch;

return parseImmediate(Operands);
1579}

1581OperandMatchResultTy RISCVAsmParser::parseVTypeI(OperandVector &Operands) {
SMLoc S = getLoc();
if (getLexer().getKind() != AsmToken::Identifier)
  return MatchOperand_NoMatch;

// Parse "e8,m1,t[a|u],m[a|u]"
StringRef Name = getLexer().getTok().getIdentifier();
if (!Name.consume_front("e"))
  return MatchOperand_NoMatch;
APInt Sew(16, Name, 10);
if (Sew != 8 && Sew != 16 && Sew != 32 && Sew != 64 && Sew != 128 &&
    Sew != 256 && Sew != 512 && Sew != 1024)
  return MatchOperand_NoMatch;
getLexer().Lex();

if (!getLexer().is(AsmToken::Comma))
  return MatchOperand_NoMatch;
getLexer().Lex();

Name = getLexer().getTok().getIdentifier();
if (!Name.consume_front("m"))
  return MatchOperand_NoMatch;
// "m" or "mf"
bool Fractional = false;
if (Name.consume_front("f")) {
  Fractional = true;
}
APInt Lmul(16, Name, 10);
if (Lmul != 1 && Lmul != 2 && Lmul != 4 && Lmul != 8)
  return MatchOperand_NoMatch;
getLexer().Lex();

if (!getLexer().is(AsmToken::Comma))
  return MatchOperand_NoMatch;
getLexer().Lex();

Name = getLexer().getTok().getIdentifier();
// ta or tu
bool TailAgnostic;
if (Name.consume_front("ta"))
  TailAgnostic = true;
else if (Name.consume_front("tu"))
  TailAgnostic = false;
else
  return MatchOperand_NoMatch;
getLexer().Lex();

if (!getLexer().is(AsmToken::Comma))
  return MatchOperand_NoMatch;
getLexer().Lex();

Name = getLexer().getTok().getIdentifier();
// ma or mu
bool MaskedoffAgnostic;
if (Name.consume_front("ma"))
  MaskedoffAgnostic = true;
else if (Name.consume_front("mu"))
  MaskedoffAgnostic = false;
else
  return MatchOperand_NoMatch;
getLexer().Lex();

if (getLexer().getKind() != AsmToken::EndOfStatement)
  return MatchOperand_NoMatch;

Operands.push_back(RISCVOperand::createVType(
    Sew, Lmul, Fractional, TailAgnostic, MaskedoffAgnostic, S, isRV64()));

return MatchOperand_Success;
1650}

1652OperandMatchResultTy RISCVAsmParser::parseMaskReg(OperandVector &Operands) {
switch (getLexer().getKind()) {
default:
  return MatchOperand_NoMatch;
case AsmToken::Identifier:
  StringRef Name = getLexer().getTok().getIdentifier();
  if (!Name.consume_back(".t")) {
    Error(getLoc(), "expected '.t' suffix");
    return MatchOperand_ParseFail;
  }
  Register RegNo;
  matchRegisterNameHelper(isRV32E(), RegNo, Name);

  if (RegNo == RISCV::NoRegister)
    return MatchOperand_NoMatch;
  if (RegNo != RISCV::V0)
    return MatchOperand_NoMatch;
  SMLoc S = getLoc();
  SMLoc E = SMLoc::getFromPointer(S.getPointer() - 1);
  getLexer().Lex();
  Operands.push_back(RISCVOperand::createReg(RegNo, S, E, isRV64()));
}

return MatchOperand_Success;
1676}

1678OperandMatchResultTy
1679RISCVAsmParser::parseMemOpBaseReg(OperandVector &Operands) {
if (getLexer().isNot(AsmToken::LParen)) {
  Error(getLoc(), "expected '('");
  return MatchOperand_ParseFail;
}

getParser().Lex(); // Eat '('
Operands.push_back(RISCVOperand::createToken("(", getLoc(), isRV64()));

if (parseRegister(Operands) != MatchOperand_Success) {
  Error(getLoc(), "expected register");
  return MatchOperand_ParseFail;
}

if (getLexer().isNot(AsmToken::RParen)) {
  Error(getLoc(), "expected ')'");
  return MatchOperand_ParseFail;
}

getParser().Lex(); // Eat ')'
Operands.push_back(RISCVOperand::createToken(")", getLoc(), isRV64()));

return MatchOperand_Success;
1702}

1704OperandMatchResultTy RISCVAsmParser::parseAtomicMemOp(OperandVector &Operands) {
// Atomic operations such as lr.w, sc.w, and amo*.w accept a "memory operand"
// as one of their register operands, such as `(a0)`. This just denotes that
// the register (in this case `a0`) contains a memory address.
//
// Normally, we would be able to parse these by putting the parens into the
// instruction string. However, GNU as also accepts a zero-offset memory
// operand (such as `0(a0)`), and ignores the 0. Normally this would be parsed
// with parseImmediate followed by parseMemOpBaseReg, but these instructions
// do not accept an immediate operand, and we do not want to add a "dummy"
// operand that is silently dropped.
//
// Instead, we use this custom parser. This will: allow (and discard) an
// offset if it is zero; require (and discard) parentheses; and add only the
// parsed register operand to `Operands`.
//
// These operands are printed with RISCVInstPrinter::printAtomicMemOp, which
// will only print the register surrounded by parentheses (which GNU as also
// uses as its canonical representation for these operands).
std::unique_ptr<RISCVOperand> OptionalImmOp;

if (getLexer().isNot(AsmToken::LParen)) {
  // Parse an Integer token. We do not accept arbritrary constant expressions
  // in the offset field (because they may include parens, which complicates
  // parsing a lot).
  int64_t ImmVal;
  SMLoc ImmStart = getLoc();
  if (getParser().parseIntToken(ImmVal,
                                "expected '(' or optional integer offset"))
    return MatchOperand_ParseFail;

  // Create a RISCVOperand for checking later (so the error messages are
  // nicer), but we don't add it to Operands.
  SMLoc ImmEnd = getLoc();
  OptionalImmOp =
      RISCVOperand::createImm(MCConstantExpr::create(ImmVal, getContext()),
                              ImmStart, ImmEnd, isRV64());
}

if (getLexer().isNot(AsmToken::LParen)) {
  Error(getLoc(), OptionalImmOp ? "expected '(' after optional integer offset"
                                : "expected '(' or optional integer offset");
  return MatchOperand_ParseFail;
}
getParser().Lex(); // Eat '('

if (parseRegister(Operands) != MatchOperand_Success) {
  Error(getLoc(), "expected register");
  return MatchOperand_ParseFail;
}

if (getLexer().isNot(AsmToken::RParen)) {
  Error(getLoc(), "expected ')'");
  return MatchOperand_ParseFail;
}
getParser().Lex(); // Eat ')'

// Deferred Handling of non-zero offsets. This makes the error messages nicer.
if (OptionalImmOp && !OptionalImmOp->isImmZero()) {
  Error(OptionalImmOp->getStartLoc(), "optional integer offset must be 0",
        SMRange(OptionalImmOp->getStartLoc(), OptionalImmOp->getEndLoc()));
  return MatchOperand_ParseFail;
}

return MatchOperand_Success;
1769}

1771/// Looks at a token type and creates the relevant operand from this
1772/// information, adding to Operands. If operand was parsed, returns false, else
1773/// true.
1774bool RISCVAsmParser::parseOperand(OperandVector &Operands, StringRef Mnemonic) {
// Check if the current operand has a custom associated parser, if so, try to
// custom parse the operand, or fallback to the general approach.
OperandMatchResultTy Result =
    MatchOperandParserImpl(Operands, Mnemonic, /*ParseForAllFeatures=*/true);
if (Result == MatchOperand_Success)
  return false;
if (Result == MatchOperand_ParseFail)
  return true;

// Attempt to parse token as a register.
if (parseRegister(Operands, true) == MatchOperand_Success)
  return false;

// Attempt to parse token as an immediate
if (parseImmediate(Operands) == MatchOperand_Success) {
  // Parse memory base register if present
  if (getLexer().is(AsmToken::LParen))
    return parseMemOpBaseReg(Operands) != MatchOperand_Success;
  return false;
}

// Finally we have exhausted all options and must declare defeat.
Error(getLoc(), "unknown operand");
return true;
1799}

1801bool RISCVAsmParser::ParseInstruction(ParseInstructionInfo &Info,
                                    StringRef Name, SMLoc NameLoc,
                                    OperandVector &Operands) {
// Ensure that if the instruction occurs when relaxation is enabled,
// relocations are forced for the file. Ideally this would be done when there
// is enough information to reliably determine if the instruction itself may
// cause relaxations. Unfortunately instruction processing stage occurs in the
// same pass as relocation emission, so it's too late to set a 'sticky bit'
// for the entire file.
if (getSTI().getFeatureBits()[RISCV::FeatureRelax]) {
  auto *Assembler = getTargetStreamer().getStreamer().getAssemblerPtr();
  if (Assembler != nullptr) {
    RISCVAsmBackend &MAB =
        static_cast<RISCVAsmBackend &>(Assembler->getBackend());
    MAB.setForceRelocs();
  }
}

// First operand is token for instruction
Operands.push_back(RISCVOperand::createToken(Name, NameLoc, isRV64()));

// If there are no more operands, then finish
if (getLexer().is(AsmToken::EndOfStatement))
  return false;

// Parse first operand
if (parseOperand(Operands, Name))
  return true;

// Parse until end of statement, consuming commas between operands
unsigned OperandIdx = 1;
while (getLexer().is(AsmToken::Comma)) {
  // Consume comma token
  getLexer().Lex();

  // Parse next operand
  if (parseOperand(Operands, Name))
    return true;

  ++OperandIdx;
}

if (getLexer().isNot(AsmToken::EndOfStatement)) {
  SMLoc Loc = getLexer().getLoc();
  getParser().eatToEndOfStatement();
  return Error(Loc, "unexpected token");
}

getParser().Lex(); // Consume the EndOfStatement.
return false;
1851}

1853bool RISCVAsmParser::classifySymbolRef(const MCExpr *Expr,
                                     RISCVMCExpr::VariantKind &Kind,
                                     int64_t &Addend) {
Kind = RISCVMCExpr::VK_RISCV_None;
Addend = 0;

if (const RISCVMCExpr *RE = dyn_cast<RISCVMCExpr>(Expr)) {
  Kind = RE->getKind();
  Expr = RE->getSubExpr();
}

// It's a simple symbol reference or constant with no addend.
if (isa<MCConstantExpr>(Expr) || isa<MCSymbolRefExpr>(Expr))
  return true;

const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr);
if (!BE)
  return false;

if (!isa<MCSymbolRefExpr>(BE->getLHS()))
  return false;

if (BE->getOpcode() != MCBinaryExpr::Add &&
    BE->getOpcode() != MCBinaryExpr::Sub)
  return false;

// We are able to support the subtraction of two symbol references
if (BE->getOpcode() == MCBinaryExpr::Sub &&
    isa<MCSymbolRefExpr>(BE->getRHS()))
  return true;

// See if the addend is a constant, otherwise there's more going
// on here than we can deal with.
auto AddendExpr = dyn_cast<MCConstantExpr>(BE->getRHS());
if (!AddendExpr)
  return false;

Addend = AddendExpr->getValue();
if (BE->getOpcode() == MCBinaryExpr::Sub)
  Addend = -Addend;

// It's some symbol reference + a constant addend
return Kind != RISCVMCExpr::VK_RISCV_Invalid;
1896}

1898bool RISCVAsmParser::ParseDirective(AsmToken DirectiveID) {
// This returns false if this function recognizes the directive
// regardless of whether it is successfully handles or reports an
// error. Otherwise it returns true to give the generic parser a
// chance at recognizing it.
StringRef IDVal = DirectiveID.getString();

if (IDVal == ".option")
1
Assuming the condition is false→
2
←
Taking false branch→
  return parseDirectiveOption();
else if (IDVal == ".attribute")
3
←
Assuming the condition is true→
4
←
Taking true branch→
  return parseDirectiveAttribute();
5
←
Calling 'RISCVAsmParser::parseDirectiveAttribute'→

return true;
1911}

1913bool RISCVAsmParser::parseDirectiveOption() {
MCAsmParser &Parser = getParser();
// Get the option token.
AsmToken Tok = Parser.getTok();
// At the moment only identifiers are supported.
if (Tok.isNot(AsmToken::Identifier))
  return Error(Parser.getTok().getLoc(),
               "unexpected token, expected identifier");

StringRef Option = Tok.getIdentifier();

if (Option == "push") {
  getTargetStreamer().emitDirectiveOptionPush();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  pushFeatureBits();
  return false;
}

if (Option == "pop") {
  SMLoc StartLoc = Parser.getTok().getLoc();
  getTargetStreamer().emitDirectiveOptionPop();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  if (popFeatureBits())
    return Error(StartLoc, ".option pop with no .option push");

  return false;
}

if (Option == "rvc") {
  getTargetStreamer().emitDirectiveOptionRVC();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  setFeatureBits(RISCV::FeatureStdExtC, "c");
  return false;
}

if (Option == "norvc") {
  getTargetStreamer().emitDirectiveOptionNoRVC();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  clearFeatureBits(RISCV::FeatureStdExtC, "c");
  return false;
}

if (Option == "pic") {
  getTargetStreamer().emitDirectiveOptionPIC();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  ParserOptions.IsPicEnabled = true;
  return false;
}

if (Option == "nopic") {
  getTargetStreamer().emitDirectiveOptionNoPIC();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  ParserOptions.IsPicEnabled = false;
  return false;
}

if (Option == "relax") {
  getTargetStreamer().emitDirectiveOptionRelax();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  setFeatureBits(RISCV::FeatureRelax, "relax");
  return false;
}

if (Option == "norelax") {
  getTargetStreamer().emitDirectiveOptionNoRelax();

  Parser.Lex();
  if (Parser.getTok().isNot(AsmToken::EndOfStatement))
    return Error(Parser.getTok().getLoc(),
                 "unexpected token, expected end of statement");

  clearFeatureBits(RISCV::FeatureRelax, "relax");
  return false;
}

// Unknown option.
Warning(Parser.getTok().getLoc(),
        "unknown option, expected 'push', 'pop', 'rvc', 'norvc', 'relax' or "
        "'norelax'");
Parser.eatToEndOfStatement();
return false;
2029}

2031/// parseDirectiveAttribute
2032///  ::= .attribute expression ',' ( expression | "string" )
2033///  ::= .attribute identifier ',' ( expression | "string" )
2034bool RISCVAsmParser::parseDirectiveAttribute() {
MCAsmParser &Parser = getParser();
int64_t Tag;
SMLoc TagLoc;
TagLoc = Parser.getTok().getLoc();
if (Parser.getTok().is(AsmToken::Identifier)) {
6
←
Calling 'AsmToken::is'→
9
←
Returning from 'AsmToken::is'→
10
←
Taking false branch→
  StringRef Name = Parser.getTok().getIdentifier();
  Optional<unsigned> Ret =
      ELFAttrs::attrTypeFromString(Name, RISCVAttrs::RISCVAttributeTags);
  if (!Ret.hasValue()) {
    Error(TagLoc, "attribute name not recognised: " + Name);
    return false;
  }
  Tag = Ret.getValue();
  Parser.Lex();
} else {
  const MCExpr *AttrExpr;

  TagLoc = Parser.getTok().getLoc();
  if (Parser.parseExpression(AttrExpr))
11
←
Assuming the condition is false→
12
←
Taking false branch→
    return true;

  const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(AttrExpr);
13
←
Assuming 'AttrExpr' is not a 'MCConstantExpr'→
14
←
'CE' initialized to a null pointer value→
  if (check(!CE, TagLoc, "expected numeric constant"))
15
←
Assuming the condition is false→
16
←
Taking false branch→
    return true;

  Tag = CE->getValue();
17
←
Called C++ object pointer is null
}

if (Parser.parseToken(AsmToken::Comma, "comma expected"))
  return true;

StringRef StringValue;
int64_t IntegerValue = 0;
bool IsIntegerValue = true;

// RISC-V attributes have a string value if the tag number is odd
// and an integer value if the tag number is even.
if (Tag % 2)
  IsIntegerValue = false;

SMLoc ValueExprLoc = Parser.getTok().getLoc();
if (IsIntegerValue) {
  const MCExpr *ValueExpr;
  if (Parser.parseExpression(ValueExpr))
    return true;

  const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(ValueExpr);
  if (!CE)
    return Error(ValueExprLoc, "expected numeric constant");
  IntegerValue = CE->getValue();
} else {
  if (Parser.getTok().isNot(AsmToken::String))
    return Error(Parser.getTok().getLoc(), "expected string constant");

  StringValue = Parser.getTok().getStringContents();
  Parser.Lex();
}

if (Parser.parseToken(AsmToken::EndOfStatement,
                      "unexpected token in '.attribute' directive"))
  return true;

if (Tag == RISCVAttrs::ARCH) {
  StringRef Arch = StringValue;
  if (Arch.consume_front("rv32"))
    clearFeatureBits(RISCV::Feature64Bit, "64bit");
  else if (Arch.consume_front("rv64"))
    setFeatureBits(RISCV::Feature64Bit, "64bit");
  else
    return Error(ValueExprLoc, "bad arch string " + Arch);

  while (!Arch.empty()) {
    if (Arch[0] == 'i')
      clearFeatureBits(RISCV::FeatureRV32E, "e");
    else if (Arch[0] == 'e')
      setFeatureBits(RISCV::FeatureRV32E, "e");
    else if (Arch[0] == 'g') {
      clearFeatureBits(RISCV::FeatureRV32E, "e");
      setFeatureBits(RISCV::FeatureStdExtM, "m");
      setFeatureBits(RISCV::FeatureStdExtA, "a");
      setFeatureBits(RISCV::FeatureStdExtF, "f");
      setFeatureBits(RISCV::FeatureStdExtD, "d");
    } else if (Arch[0] == 'm')
      setFeatureBits(RISCV::FeatureStdExtM, "m");
    else if (Arch[0] == 'a')
      setFeatureBits(RISCV::FeatureStdExtA, "a");
    else if (Arch[0] == 'f')
      setFeatureBits(RISCV::FeatureStdExtF, "f");
    else if (Arch[0] == 'd') {
      setFeatureBits(RISCV::FeatureStdExtF, "f");
      setFeatureBits(RISCV::FeatureStdExtD, "d");
    } else if (Arch[0] == 'c') {
      setFeatureBits(RISCV::FeatureStdExtC, "c");
    } else
      return Error(ValueExprLoc, "bad arch string " + Arch);

    Arch = Arch.drop_front(1);
    int major = 0;
    int minor = 0;
    Arch.consumeInteger(10, major);
    Arch.consume_front("p");
    Arch.consumeInteger(10, minor);
    if (major != 0 || minor != 0) {
      Arch = Arch.drop_until([](char c) { return c == '_' || c == '"'; });
      Arch = Arch.drop_while([](char c) { return c == '_'; });
    }
  }
}

if (IsIntegerValue)
  getTargetStreamer().emitAttribute(Tag, IntegerValue);
else {
  if (Tag != RISCVAttrs::ARCH) {
    getTargetStreamer().emitTextAttribute(Tag, StringValue);
  } else {
    std::string formalArchStr = "rv32";
    if (getFeatureBits(RISCV::Feature64Bit))
      formalArchStr = "rv64";
    if (getFeatureBits(RISCV::FeatureRV32E))
      formalArchStr = (Twine(formalArchStr) + "e1p9").str();
    else
      formalArchStr = (Twine(formalArchStr) + "i2p0").str();

    if (getFeatureBits(RISCV::FeatureStdExtM))
      formalArchStr = (Twine(formalArchStr) + "_m2p0").str();
    if (getFeatureBits(RISCV::FeatureStdExtA))
      formalArchStr = (Twine(formalArchStr) + "_a2p0").str();
    if (getFeatureBits(RISCV::FeatureStdExtF))
      formalArchStr = (Twine(formalArchStr) + "_f2p0").str();
    if (getFeatureBits(RISCV::FeatureStdExtD))
      formalArchStr = (Twine(formalArchStr) + "_d2p0").str();
    if (getFeatureBits(RISCV::FeatureStdExtC))
      formalArchStr = (Twine(formalArchStr) + "_c2p0").str();

    getTargetStreamer().emitTextAttribute(Tag, formalArchStr);
  }
}

return false;
2174}

2176void RISCVAsmParser::emitToStreamer(MCStreamer &S, const MCInst &Inst) {
MCInst CInst;
bool Res = compressInst(CInst, Inst, getSTI(), S.getContext());
if (Res)
  ++RISCVNumInstrsCompressed;
S.emitInstruction((Res ? CInst : Inst), getSTI());
2182}

2184void RISCVAsmParser::emitLoadImm(Register DestReg, int64_t Value,
                               MCStreamer &Out) {
RISCVMatInt::InstSeq Seq;
RISCVMatInt::generateInstSeq(Value, isRV64(), Seq);

Register SrcReg = RISCV::X0;
for (RISCVMatInt::Inst &Inst : Seq) {
  if (Inst.Opc == RISCV::LUI) {
    emitToStreamer(
        Out, MCInstBuilder(RISCV::LUI).addReg(DestReg).addImm(Inst.Imm));
  } else {
    emitToStreamer(
        Out, MCInstBuilder(Inst.Opc).addReg(DestReg).addReg(SrcReg).addImm(
                 Inst.Imm));
  }

  // Only the first instruction has X0 as its source.
  SrcReg = DestReg;
}
2203}

2205void RISCVAsmParser::emitAuipcInstPair(MCOperand DestReg, MCOperand TmpReg,
                                     const MCExpr *Symbol,
                                     RISCVMCExpr::VariantKind VKHi,
                                     unsigned SecondOpcode, SMLoc IDLoc,
                                     MCStreamer &Out) {
// A pair of instructions for PC-relative addressing; expands to
//   TmpLabel: AUIPC TmpReg, VKHi(symbol)
//             OP DestReg, TmpReg, %pcrel_lo(TmpLabel)
MCContext &Ctx = getContext();

MCSymbol *TmpLabel = Ctx.createTempSymbol(
    "pcrel_hi", /* AlwaysAddSuffix */ true, /* CanBeUnnamed */ false);
Out.emitLabel(TmpLabel);

const RISCVMCExpr *SymbolHi = RISCVMCExpr::create(Symbol, VKHi, Ctx);
emitToStreamer(
    Out, MCInstBuilder(RISCV::AUIPC).addOperand(TmpReg).addExpr(SymbolHi));

const MCExpr *RefToLinkTmpLabel =
    RISCVMCExpr::create(MCSymbolRefExpr::create(TmpLabel, Ctx),
                        RISCVMCExpr::VK_RISCV_PCREL_LO, Ctx);

emitToStreamer(Out, MCInstBuilder(SecondOpcode)
                        .addOperand(DestReg)
                        .addOperand(TmpReg)
                        .addExpr(RefToLinkTmpLabel));
2231}

2233void RISCVAsmParser::emitLoadLocalAddress(MCInst &Inst, SMLoc IDLoc,
                                        MCStreamer &Out) {
// The load local address pseudo-instruction "lla" is used in PC-relative
// addressing of local symbols:
//   lla rdest, symbol
// expands to
//   TmpLabel: AUIPC rdest, %pcrel_hi(symbol)
//             ADDI rdest, rdest, %pcrel_lo(TmpLabel)
MCOperand DestReg = Inst.getOperand(0);
const MCExpr *Symbol = Inst.getOperand(1).getExpr();
emitAuipcInstPair(DestReg, DestReg, Symbol, RISCVMCExpr::VK_RISCV_PCREL_HI,
                  RISCV::ADDI, IDLoc, Out);
2245}

2247void RISCVAsmParser::emitLoadAddress(MCInst &Inst, SMLoc IDLoc,
                                   MCStreamer &Out) {
// The load address pseudo-instruction "la" is used in PC-relative and
// GOT-indirect addressing of global symbols:
//   la rdest, symbol
// expands to either (for non-PIC)
//   TmpLabel: AUIPC rdest, %pcrel_hi(symbol)
//             ADDI rdest, rdest, %pcrel_lo(TmpLabel)
// or (for PIC)
//   TmpLabel: AUIPC rdest, %got_pcrel_hi(symbol)
//             Lx rdest, %pcrel_lo(TmpLabel)(rdest)
MCOperand DestReg = Inst.getOperand(0);
const MCExpr *Symbol = Inst.getOperand(1).getExpr();
unsigned SecondOpcode;
RISCVMCExpr::VariantKind VKHi;
if (ParserOptions.IsPicEnabled) {
  SecondOpcode = isRV64() ? RISCV::LD : RISCV::LW;
  VKHi = RISCVMCExpr::VK_RISCV_GOT_HI;
} else {
  SecondOpcode = RISCV::ADDI;
  VKHi = RISCVMCExpr::VK_RISCV_PCREL_HI;
}
emitAuipcInstPair(DestReg, DestReg, Symbol, VKHi, SecondOpcode, IDLoc, Out);
2270}

2272void RISCVAsmParser::emitLoadTLSIEAddress(MCInst &Inst, SMLoc IDLoc,
                                        MCStreamer &Out) {
// The load TLS IE address pseudo-instruction "la.tls.ie" is used in
// initial-exec TLS model addressing of global symbols:
//   la.tls.ie rdest, symbol
// expands to
//   TmpLabel: AUIPC rdest, %tls_ie_pcrel_hi(symbol)
//             Lx rdest, %pcrel_lo(TmpLabel)(rdest)
MCOperand DestReg = Inst.getOperand(0);
const MCExpr *Symbol = Inst.getOperand(1).getExpr();
unsigned SecondOpcode = isRV64() ? RISCV::LD : RISCV::LW;
emitAuipcInstPair(DestReg, DestReg, Symbol, RISCVMCExpr::VK_RISCV_TLS_GOT_HI,
                  SecondOpcode, IDLoc, Out);
2285}

2287void RISCVAsmParser::emitLoadTLSGDAddress(MCInst &Inst, SMLoc IDLoc,
                                        MCStreamer &Out) {
// The load TLS GD address pseudo-instruction "la.tls.gd" is used in
// global-dynamic TLS model addressing of global symbols:
//   la.tls.gd rdest, symbol
// expands to
//   TmpLabel: AUIPC rdest, %tls_gd_pcrel_hi(symbol)
//             ADDI rdest, rdest, %pcrel_lo(TmpLabel)
MCOperand DestReg = Inst.getOperand(0);
const MCExpr *Symbol = Inst.getOperand(1).getExpr();
emitAuipcInstPair(DestReg, DestReg, Symbol, RISCVMCExpr::VK_RISCV_TLS_GD_HI,
                  RISCV::ADDI, IDLoc, Out);
2299}

2301void RISCVAsmParser::emitLoadStoreSymbol(MCInst &Inst, unsigned Opcode,
                                       SMLoc IDLoc, MCStreamer &Out,
                                       bool HasTmpReg) {
// The load/store pseudo-instruction does a pc-relative load with
// a symbol.
//
// The expansion looks like this
//
//   TmpLabel: AUIPC tmp, %pcrel_hi(symbol)
//             [S|L]X    rd, %pcrel_lo(TmpLabel)(tmp)
MCOperand DestReg = Inst.getOperand(0);
unsigned SymbolOpIdx = HasTmpReg ? 2 : 1;
unsigned TmpRegOpIdx = HasTmpReg ? 1 : 0;
MCOperand TmpReg = Inst.getOperand(TmpRegOpIdx);
const MCExpr *Symbol = Inst.getOperand(SymbolOpIdx).getExpr();
emitAuipcInstPair(DestReg, TmpReg, Symbol, RISCVMCExpr::VK_RISCV_PCREL_HI,
                  Opcode, IDLoc, Out);
2318}

2320bool RISCVAsmParser::checkPseudoAddTPRel(MCInst &Inst,
                                       OperandVector &Operands) {
assert(Inst.getOpcode() == RISCV::PseudoAddTPRel && "Invalid instruction")((Inst.getOpcode() == RISCV::PseudoAddTPRel && "Invalid instruction"
) ? static_cast<void> (0) : __assert_fail ("Inst.getOpcode() == RISCV::PseudoAddTPRel && \"Invalid instruction\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 2322, __PRETTY_FUNCTION__));
assert(Inst.getOperand(2).isReg() && "Unexpected second operand kind")((Inst.getOperand(2).isReg() && "Unexpected second operand kind"
) ? static_cast<void> (0) : __assert_fail ("Inst.getOperand(2).isReg() && \"Unexpected second operand kind\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp"
, 2323, __PRETTY_FUNCTION__));
if (Inst.getOperand(2).getReg() != RISCV::X4) {
  SMLoc ErrorLoc = ((RISCVOperand &)*Operands[3]).getStartLoc();
  return Error(ErrorLoc, "the second input operand must be tp/x4 when using "
                         "%tprel_add modifier");
}

return false;
2331}

2333std::unique_ptr<RISCVOperand> RISCVAsmParser::defaultMaskRegOp() const {
return RISCVOperand::createReg(RISCV::NoRegister, llvm::SMLoc(),
                               llvm::SMLoc(), isRV64());
2336}

2338bool RISCVAsmParser::validateInstruction(MCInst &Inst,
                                       OperandVector &Operands) {
const MCInstrDesc &MCID = MII.get(Inst.getOpcode());
unsigned TargetFlags =
    (MCID.TSFlags >> RISCV::ConstraintOffset) & RISCV::ConstraintMask;
if (TargetFlags == RISCV::NoConstraint)
  return false;

unsigned DestReg = Inst.getOperand(0).getReg();
unsigned CheckReg;
// Operands[1] will be the first operand, DestReg.
SMLoc Loc = Operands[1]->getStartLoc();
if (TargetFlags & RISCV::VS2Constraint) {
  CheckReg = Inst.getOperand(1).getReg();
  if (DestReg == CheckReg)
    return Error(Loc, "The destination vector register group cannot overlap"
                      " the source vector register group.");
}
if ((TargetFlags & RISCV::VS1Constraint) && (Inst.getOperand(2).isReg())) {
  CheckReg = Inst.getOperand(2).getReg();
  if (DestReg == CheckReg)
    return Error(Loc, "The destination vector register group cannot overlap"
                      " the source vector register group.");
}
if ((TargetFlags & RISCV::VMConstraint) && (DestReg == RISCV::V0)) {
  // vadc, vsbc are special cases. These instructions have no mask register.
  // The destination register could not be V0.
  unsigned Opcode = Inst.getOpcode();
  if (Opcode == RISCV::VADC_VVM || Opcode == RISCV::VADC_VXM ||
      Opcode == RISCV::VADC_VIM || Opcode == RISCV::VSBC_VVM ||
      Opcode == RISCV::VSBC_VXM)
    return Error(Loc, "The destination vector register group cannot be V0.");

  // Regardless masked or unmasked version, the number of operands is the
  // same. For example, "viota.m v0, v2" is "viota.m v0, v2, NoRegister"
  // actually. We need to check the last operand to ensure whether it is
  // masked or not.
  if ((TargetFlags & RISCV::OneInput) && (Inst.getNumOperands() == 3))
    CheckReg = Inst.getOperand(2).getReg();
  else if (Inst.getNumOperands() == 4)
    CheckReg = Inst.getOperand(3).getReg();
  if (DestReg == CheckReg)
    return Error(Loc, "The destination vector register group cannot overlap"
                      " the mask register.");
}
return false;
2384}

2386bool RISCVAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
                                      OperandVector &Operands,
                                      MCStreamer &Out) {
Inst.setLoc(IDLoc);

switch (Inst.getOpcode()) {
default:
  break;
case RISCV::PseudoLI: {
  Register Reg = Inst.getOperand(0).getReg();
  const MCOperand &Op1 = Inst.getOperand(1);
  if (Op1.isExpr()) {
    // We must have li reg, %lo(sym) or li reg, %pcrel_lo(sym) or similar.
    // Just convert to an addi. This allows compatibility with gas.
    emitToStreamer(Out, MCInstBuilder(RISCV::ADDI)
                            .addReg(Reg)
                            .addReg(RISCV::X0)
                            .addExpr(Op1.getExpr()));
    return false;
  }
  int64_t Imm = Inst.getOperand(1).getImm();
  // On RV32 the immediate here can either be a signed or an unsigned
  // 32-bit number. Sign extension has to be performed to ensure that Imm
  // represents the expected signed 64-bit number.
  if (!isRV64())
    Imm = SignExtend64<32>(Imm);
  emitLoadImm(Reg, Imm, Out);
  return false;
}
case RISCV::PseudoLLA:
  emitLoadLocalAddress(Inst, IDLoc, Out);
  return false;
case RISCV::PseudoLA:
  emitLoadAddress(Inst, IDLoc, Out);
  return false;
case RISCV::PseudoLA_TLS_IE:
  emitLoadTLSIEAddress(Inst, IDLoc, Out);
  return false;
case RISCV::PseudoLA_TLS_GD:
  emitLoadTLSGDAddress(Inst, IDLoc, Out);
  return false;
case RISCV::PseudoLB:
  emitLoadStoreSymbol(Inst, RISCV::LB, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoLBU:
  emitLoadStoreSymbol(Inst, RISCV::LBU, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoLH:
  emitLoadStoreSymbol(Inst, RISCV::LH, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoLHU:
  emitLoadStoreSymbol(Inst, RISCV::LHU, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoLW:
  emitLoadStoreSymbol(Inst, RISCV::LW, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoLWU:
  emitLoadStoreSymbol(Inst, RISCV::LWU, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoLD:
  emitLoadStoreSymbol(Inst, RISCV::LD, IDLoc, Out, /*HasTmpReg=*/false);
  return false;
case RISCV::PseudoFLW:
  emitLoadStoreSymbol(Inst, RISCV::FLW, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoFLD:
  emitLoadStoreSymbol(Inst, RISCV::FLD, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoSB:
  emitLoadStoreSymbol(Inst, RISCV::SB, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoSH:
  emitLoadStoreSymbol(Inst, RISCV::SH, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoSW:
  emitLoadStoreSymbol(Inst, RISCV::SW, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoSD:
  emitLoadStoreSymbol(Inst, RISCV::SD, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoFSW:
  emitLoadStoreSymbol(Inst, RISCV::FSW, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoFSD:
  emitLoadStoreSymbol(Inst, RISCV::FSD, IDLoc, Out, /*HasTmpReg=*/true);
  return false;
case RISCV::PseudoAddTPRel:
  if (checkPseudoAddTPRel(Inst, Operands))
    return true;
  break;
}

emitToStreamer(Out, Inst);
return false;
2480}

2482extern "C" LLVM_EXTERNAL_VISIBILITY__attribute__ ((visibility("default"))) void LLVMInitializeRISCVAsmParser() {
RegisterMCAsmParser<RISCVAsmParser> X(getTheRISCV32Target());
RegisterMCAsmParser<RISCVAsmParser> Y(getTheRISCV64Target());
2485}

←

/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include/llvm/MC/MCAsmMacro.h

1//===- MCAsmMacro.h - Assembly Macros ---------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//

9#ifndef LLVM_MC_MCASMMACRO_H
10#define LLVM_MC_MCASMMACRO_H

12#include "llvm/ADT/APInt.h"
13#include "llvm/ADT/StringRef.h"
14#include "llvm/Support/Debug.h"
15#include "llvm/Support/SMLoc.h"
16#include <vector>

18namespace llvm {

20/// Target independent representation for an assembler token.
21class AsmToken {
22public:
enum TokenKind {
  // Markers
  Eof, Error,

  // String values.
  Identifier,
  String,

  // Integer values.
  Integer,
  BigNum, // larger than 64 bits

  // Real values.
  Real,

  // Comments
  Comment,
  HashDirective,
  // No-value.
  EndOfStatement,
  Colon,
  Space,
  Plus, Minus, Tilde,
  Slash,     // '/'
  BackSlash, // '\'
  LParen, RParen, LBrac, RBrac, LCurly, RCurly,
  Star, Dot, Comma, Dollar, Equal, EqualEqual,

  Pipe, PipePipe, Caret,
  Amp, AmpAmp, Exclaim, ExclaimEqual, Percent, Hash,
  Less, LessEqual, LessLess, LessGreater,
  Greater, GreaterEqual, GreaterGreater, At, MinusGreater,

  // MIPS unary expression operators such as %neg.
  PercentCall16, PercentCall_Hi, PercentCall_Lo, PercentDtprel_Hi,
  PercentDtprel_Lo, PercentGot, PercentGot_Disp, PercentGot_Hi, PercentGot_Lo,
  PercentGot_Ofst, PercentGot_Page, PercentGottprel, PercentGp_Rel, PercentHi,
  PercentHigher, PercentHighest, PercentLo, PercentNeg, PercentPcrel_Hi,
  PercentPcrel_Lo, PercentTlsgd, PercentTlsldm, PercentTprel_Hi,
  PercentTprel_Lo
};

65private:
TokenKind Kind;

/// A reference to the entire token contents; this is always a pointer into
/// a memory buffer owned by the source manager.
StringRef Str;

APInt IntVal;

74public:
AsmToken() = default;
AsmToken(TokenKind Kind, StringRef Str, APInt IntVal)
    : Kind(Kind), Str(Str), IntVal(std::move(IntVal)) {}
AsmToken(TokenKind Kind, StringRef Str, int64_t IntVal = 0)
    : Kind(Kind), Str(Str), IntVal(64, IntVal, true) {}

TokenKind getKind() const { return Kind; }
bool is(TokenKind K) const { return Kind == K; }
7
←
Assuming 'K' is not equal to field 'Kind'→
8
←
Returning zero, which participates in a condition later→
bool isNot(TokenKind K) const { return Kind != K; }

SMLoc getLoc() const;
SMLoc getEndLoc() const;
SMRange getLocRange() const;

/// Get the contents of a string token (without quotes).
StringRef getStringContents() const {
  assert(Kind == String && "This token isn't a string!")((Kind == String && "This token isn't a string!") ? static_cast
<void> (0) : __assert_fail ("Kind == String && \"This token isn't a string!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include/llvm/MC/MCAsmMacro.h"
, 91, __PRETTY_FUNCTION__));
  return Str.slice(1, Str.size() - 1);
}

/// Get the identifier string for the current token, which should be an
/// identifier or a string. This gets the portion of the string which should
/// be used as the identifier, e.g., it does not include the quotes on
/// strings.
StringRef getIdentifier() const {
  if (Kind == Identifier)
    return getString();
  return getStringContents();
}

/// Get the string for the current token, this includes all characters (for
/// example, the quotes on strings) in the token.
///
/// The returned StringRef points into the source manager's memory buffer, and
/// is safe to store across calls to Lex().
StringRef getString() const { return Str; }

// FIXME: Don't compute this in advance, it makes every token larger, and is
// also not generally what we want (it is nicer for recovery etc. to lex 123br
// as a single token, then diagnose as an invalid number).
int64_t getIntVal() const {
  assert(Kind == Integer && "This token isn't an integer!")((Kind == Integer && "This token isn't an integer!") ?
 static_cast<void> (0) : __assert_fail ("Kind == Integer && \"This token isn't an integer!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include/llvm/MC/MCAsmMacro.h"
, 116, __PRETTY_FUNCTION__));
  return IntVal.getZExtValue();
}

APInt getAPIntVal() const {
  assert((Kind == Integer || Kind == BigNum) &&(((Kind == Integer || Kind == BigNum) && "This token isn't an integer!"
) ? static_cast<void> (0) : __assert_fail ("(Kind == Integer || Kind == BigNum) && \"This token isn't an integer!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include/llvm/MC/MCAsmMacro.h"
, 122, __PRETTY_FUNCTION__))
         "This token isn't an integer!")(((Kind == Integer || Kind == BigNum) && "This token isn't an integer!"
) ? static_cast<void> (0) : __assert_fail ("(Kind == Integer || Kind == BigNum) && \"This token isn't an integer!\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/llvm/include/llvm/MC/MCAsmMacro.h"
, 122, __PRETTY_FUNCTION__));
  return IntVal;
}

void dump(raw_ostream &OS) const;
127};

129struct MCAsmMacroParameter {
StringRef Name;
std::vector<AsmToken> Value;
bool Required = false;
bool Vararg = false;

135#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void dump() const { dump(dbgs()); }
LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void dump(raw_ostream &OS) const;
138#endif
139};

141typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters;
142struct MCAsmMacro {
StringRef Name;
StringRef Body;
MCAsmMacroParameters Parameters;

147public:
MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P)
    : Name(N), Body(B), Parameters(std::move(P)) {}

151#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void dump() const { dump(dbgs()); }
LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void dump(raw_ostream &OS) const;
154#endif
155};
156} // namespace llvm

158#endif