[llvm] r179657 - Mips assembler: Enable handling of nested expressions

Eric Christopher echristo at gmail.com
Wed Apr 17 13:12:55 PDT 2013


It's already been fixed. Please pay attention to the bots after you
commit if possible :)

Thanks!

-eric

On Wed, Apr 17, 2013 at 11:48 AM, Jack Carter <Jack.Carter at imgtec.com> wrote:
> My bad for accecpting the patch in the first place.
>
> I will address the issues you pointed out.
>
> Jack
> ________________________________________
> From: Eric Christopher [echristo at gmail.com]
> Sent: Tuesday, April 16, 2013 6:57 PM
> To: Jack Carter
> Cc: llvm-commits at cs.uiuc.edu
> Subject: Re: [llvm] r179657 - Mips assembler: Enable handling of nested expressions
>
> Looks like this broke the lld build with -Wsometimes-uninitialized and -Werror.
>
> http://lab.llvm.org:8011/builders/lld-x86_64-darwin11/builds/821
>
> -eric
>
> On Tue, Apr 16, 2013 at 5:18 PM, Jack Carter <jack.carter at imgtec.com> wrote:
>> Author: jacksprat
>> Date: Tue Apr 16 19:18:04 2013
>> New Revision: 179657
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=179657&view=rev
>> Log:
>> Mips assembler: Enable handling of nested expressions
>>
>> This patch allows the Mips assembler to parse and emit nested
>> expressions as instruction operands. It also extends the
>> expansion of memory instructions when an offset is given as
>> an expression.
>>
>> Contributer: Vladimir Medic
>>
>>
>> Added:
>>     llvm/trunk/test/MC/Mips/expr1.s
>> Modified:
>>     llvm/trunk/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
>>     llvm/trunk/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
>>
>> Modified: llvm/trunk/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/AsmParser/MipsAsmParser.cpp?rev=179657&r1=179656&r2=179657&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/Target/Mips/AsmParser/MipsAsmParser.cpp (original)
>> +++ llvm/trunk/lib/Target/Mips/AsmParser/MipsAsmParser.cpp Tue Apr 16 19:18:04 2013
>> @@ -127,9 +127,12 @@ class MipsAsmParser : public MCTargetAsm
>>                       bool isLoad,bool isImmOpnd);
>>    bool reportParseError(StringRef ErrorMsg);
>>
>> -  bool parseMemOffset(const MCExpr *&Res);
>> +  bool parseMemOffset(const MCExpr *&Res, bool isParenExpr);
>>    bool parseRelocOperand(const MCExpr *&Res);
>>
>> +  const MCExpr* evaluateRelocExpr(const MCExpr *Expr, StringRef RelocStr);
>> +
>> +  bool isEvaluated(const MCExpr *Expr);
>>    bool parseDirectiveSet();
>>
>>    bool parseSetAtDirective();
>> @@ -409,7 +412,7 @@ static const MCInstrDesc &getInstDesc(un
>>  }
>>
>>  bool MipsAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
>> -                        SmallVectorImpl<MCInst> &Instructions) {
>> +                                       SmallVectorImpl<MCInst> &Instructions) {
>>    const MCInstrDesc &MCID = getInstDesc(Inst.getOpcode());
>>    Inst.setLoc(IDLoc);
>>    if (MCID.mayLoad() || MCID.mayStore()) {
>> @@ -431,17 +434,20 @@ bool MipsAsmParser::processInstruction(M
>>            const MCExpr *Expr = Op.getExpr();
>>            if (Expr->getKind() == MCExpr::SymbolRef){
>>              const MCSymbolRefExpr *SR =
>> -                    static_cast<const MCSymbolRefExpr*>(Expr);
>> +                static_cast<const MCSymbolRefExpr*>(Expr);
>>              if (SR->getKind() == MCSymbolRefExpr::VK_None) {
>>                // Expand symbol
>>                expandMemInst(Inst,IDLoc,Instructions,MCID.mayLoad(),false);
>>                return false;
>>              }
>> +          } else if (!isEvaluated(Expr)) {
>> +            expandMemInst(Inst,IDLoc,Instructions,MCID.mayLoad(),false);
>> +            return false;
>>            }
>>          }
>>        }
>> -    }
>> -  }
>> +    }// For
>> +  }// If load/store
>>
>>    if (needsExpansion(Inst))
>>      expandInstruction(Inst, IDLoc, Instructions);
>> @@ -644,20 +650,23 @@ void MipsAsmParser::expandMemInst(MCInst
>>                                          MCSymbolRefExpr::VK_Mips_ABS_HI,
>>                                          getContext());
>>        TempInst.addOperand(MCOperand::CreateExpr(HiExpr));
>> +    } else {
>> +      const MCExpr *HiExpr = evaluateRelocExpr(ExprOffset,"hi");
>> +      TempInst.addOperand(MCOperand::CreateExpr(HiExpr));
>>      }
>>    }
>>    // Add the instruction to the list
>>    Instructions.push_back(TempInst);
>> -  // and prepare TempInst for next instruction
>> +  // And prepare TempInst for next instruction
>>    TempInst.clear();
>> -  // which is add temp register to base
>> +  // Which is add temp register to base
>>    TempInst.setOpcode(Mips::ADDu);
>>    TempInst.addOperand(MCOperand::CreateReg(TmpRegNum));
>>    TempInst.addOperand(MCOperand::CreateReg(TmpRegNum));
>>    TempInst.addOperand(MCOperand::CreateReg(BaseRegNum));
>>    Instructions.push_back(TempInst);
>>    TempInst.clear();
>> -  // and finaly, create original instruction with low part
>> +  // And finaly, create original instruction with low part
>>    // of offset and new base
>>    TempInst.setOpcode(Inst.getOpcode());
>>    TempInst.addOperand(MCOperand::CreateReg(RegOpNum));
>> @@ -671,6 +680,9 @@ void MipsAsmParser::expandMemInst(MCInst
>>                                        MCSymbolRefExpr::VK_Mips_ABS_LO,
>>                                        getContext());
>>        TempInst.addOperand(MCOperand::CreateExpr(LoExpr));
>> +    } else {
>> +      const MCExpr *LoExpr = evaluateRelocExpr(ExprOffset,"lo");
>> +      TempInst.addOperand(MCOperand::CreateExpr(LoExpr));
>>      }
>>    }
>>    Instructions.push_back(TempInst);
>> @@ -960,13 +972,13 @@ bool MipsAsmParser::ParseOperand(SmallVe
>>      // we need to assigne the propper RegisterKind
>>     if (searchSymbolAlias(Operands,MipsOperand::Kind_None))
>>       return false;
>> -    //else drop to expression parsing
>> +    // Else drop to expression parsing
>>    case AsmToken::LParen:
>>    case AsmToken::Minus:
>>    case AsmToken::Plus:
>>    case AsmToken::Integer:
>>    case AsmToken::String: {
>> -     // quoted label names
>> +     // Quoted label names
>>      const MCExpr *IdVal;
>>      SMLoc S = Parser.getTok().getLoc();
>>      if (getParser().parseExpression(IdVal))
>> @@ -976,9 +988,9 @@ bool MipsAsmParser::ParseOperand(SmallVe
>>      return false;
>>    }
>>    case AsmToken::Percent: {
>> -    // it is a symbol reference or constant expression
>> +    // It is a symbol reference or constant expression
>>      const MCExpr *IdVal;
>> -    SMLoc S = Parser.getTok().getLoc(); // start location of the operand
>> +    SMLoc S = Parser.getTok().getLoc(); // Start location of the operand
>>      if (parseRelocOperand(IdVal))
>>        return true;
>>
>> @@ -991,31 +1003,100 @@ bool MipsAsmParser::ParseOperand(SmallVe
>>    return true;
>>  }
>>
>> +const MCExpr* MipsAsmParser::evaluateRelocExpr(const MCExpr *Expr,
>> +                                               StringRef RelocStr) {
>> +
>> +  const MCExpr *Res;
>> +  // Check the type of the expression
>> +  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Expr)) {
>> +    // It's a constant, evaluate lo or hi value
>> +    if (RelocStr == "lo") {
>> +      short Val = MCE->getValue();
>> +      Res = MCConstantExpr::Create(Val, getContext());
>> +    } else if (RelocStr == "hi") {
>> +      int Val = MCE->getValue();
>> +      int LoSign = Val & 0x8000;
>> +      Val = (Val & 0xffff0000) >> 16;
>> +      // Lower part is treated as a signed int, so if it is negative
>> +      // we must add 1 to the hi part to compensate
>> +      if (LoSign)
>> +        Val++;
>> +      Res = MCConstantExpr::Create(Val, getContext());
>> +    }
>> +   return Res;
>> +  }
>> +
>> +  if (const MCSymbolRefExpr *MSRE = dyn_cast<MCSymbolRefExpr>(Expr)) {
>> +    // It's a symbol, create symbolic expression from symbol
>> +    StringRef Symbol = MSRE->getSymbol().getName();
>> +    MCSymbolRefExpr::VariantKind VK = getVariantKind(RelocStr);
>> +    Res = MCSymbolRefExpr::Create(Symbol,VK,getContext());
>> +    return Res;
>> +  }
>> +
>> +  if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
>> +    const MCExpr *LExp = evaluateRelocExpr(BE->getLHS(),RelocStr);
>> +    const MCExpr *RExp = evaluateRelocExpr(BE->getRHS(),RelocStr);
>> +    Res = MCBinaryExpr::Create(BE->getOpcode(), LExp, RExp, getContext());
>> +    return Res;
>> +  }
>> +
>> +  if (const MCUnaryExpr *UN = dyn_cast<MCUnaryExpr>(Expr)) {
>> +    const MCExpr *UnExp = evaluateRelocExpr(UN->getSubExpr(),RelocStr);
>> +  Res = MCUnaryExpr::Create(UN->getOpcode(), UnExp, getContext());
>> +  return Res;
>> +  }
>> +  // Just return the original expr
>> +  return Expr;
>> +}
>> +
>> +bool MipsAsmParser::isEvaluated(const MCExpr *Expr) {
>> +
>> +  switch (Expr->getKind()) {
>> +  case MCExpr::Constant:
>> +    return true;
>> +  case MCExpr::SymbolRef:
>> +    return (cast<MCSymbolRefExpr>(Expr)->getKind() != MCSymbolRefExpr::VK_None);
>> +  case MCExpr::Binary:
>> +    if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
>> +      if (!isEvaluated(BE->getLHS()))
>> +        return false;
>> +      return isEvaluated(BE->getRHS());
>> +    }
>> +  case MCExpr::Unary:
>> +    return isEvaluated(cast<MCUnaryExpr>(Expr)->getSubExpr());
>> +  default:
>> +    return false;
>> +  }
>> +  return false;
>> +
>> +}
>>  bool MipsAsmParser::parseRelocOperand(const MCExpr *&Res) {
>>
>> -  Parser.Lex(); // eat % token
>> -  const AsmToken &Tok = Parser.getTok(); // get next token, operation
>> +
>> +  Parser.Lex(); // Eat % token
>> +  const AsmToken &Tok = Parser.getTok(); // Get next token, operation
>>    if (Tok.isNot(AsmToken::Identifier))
>>      return true;
>>
>>    std::string Str = Tok.getIdentifier().str();
>>
>> -  Parser.Lex(); // eat identifier
>> -  // now make expression from the rest of the operand
>> +  Parser.Lex(); // Eat identifier
>> +  // Now make expression from the rest of the operand
>>    const MCExpr *IdVal;
>>    SMLoc EndLoc;
>>
>>    if (getLexer().getKind() == AsmToken::LParen) {
>>      while (1) {
>> -      Parser.Lex(); // eat '(' token
>> +      Parser.Lex(); // Eat '(' token
>>        if (getLexer().getKind() == AsmToken::Percent) {
>> -        Parser.Lex(); // eat % token
>> +        Parser.Lex(); // Eat % token
>>          const AsmToken &nextTok = Parser.getTok();
>>          if (nextTok.isNot(AsmToken::Identifier))
>>            return true;
>>          Str += "(%";
>>          Str += nextTok.getIdentifier();
>> -        Parser.Lex(); // eat identifier
>> +        Parser.Lex(); // Eat identifier
>>          if (getLexer().getKind() != AsmToken::LParen)
>>            return true;
>>        } else
>> @@ -1025,38 +1106,13 @@ bool MipsAsmParser::parseRelocOperand(co
>>        return true;
>>
>>      while (getLexer().getKind() == AsmToken::RParen)
>> -      Parser.Lex(); // eat ')' token
>> +      Parser.Lex(); // Eat ')' token
>>
>>    } else
>> -    return true; // parenthesis must follow reloc operand
>> +    return true; // Parenthesis must follow reloc operand
>>
>> -  // Check the type of the expression
>> -  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(IdVal)) {
>> -    // It's a constant, evaluate lo or hi value
>> -    if (Str == "lo") {
>> -      short Val = MCE->getValue();
>> -      Res = MCConstantExpr::Create(Val, getContext());
>> -    } else if (Str == "hi") {
>> -      int Val = MCE->getValue();
>> -      int LoSign = Val & 0x8000;
>> -      Val = (Val & 0xffff0000) >> 16;
>> -      // Lower part is treated as a signed int, so if it is negative
>> -      // we must add 1 to the hi part to compensate
>> -      if (LoSign)
>> -        Val++;
>> -      Res = MCConstantExpr::Create(Val, getContext());
>> -    }
>> -    return false;
>> -  }
>> -
>> -  if (const MCSymbolRefExpr *MSRE = dyn_cast<MCSymbolRefExpr>(IdVal)) {
>> -    // It's a symbol, create symbolic expression from symbol
>> -    StringRef Symbol = MSRE->getSymbol().getName();
>> -    MCSymbolRefExpr::VariantKind VK = getVariantKind(Str);
>> -    Res = MCSymbolRefExpr::Create(Symbol,VK,getContext());
>> -    return false;
>> -  }
>> -  return true;
>> +  Res = evaluateRelocExpr(IdVal,Str);
>> +  return false;
>>  }
>>
>>  bool MipsAsmParser::ParseRegister(unsigned &RegNo, SMLoc &StartLoc,
>> @@ -1068,24 +1124,33 @@ bool MipsAsmParser::ParseRegister(unsign
>>    return (RegNo == (unsigned)-1);
>>  }
>>
>> -bool MipsAsmParser::parseMemOffset(const MCExpr *&Res) {
>> +bool MipsAsmParser::parseMemOffset(const MCExpr *&Res, bool isParenExpr) {
>>
>>    SMLoc S;
>> +  bool Result = true;
>> +
>> +  while (getLexer().getKind() == AsmToken::LParen)
>> +    Parser.Lex();
>>
>>    switch(getLexer().getKind()) {
>>    default:
>>      return true;
>>    case AsmToken::Identifier:
>> +  case AsmToken::LParen:
>>    case AsmToken::Integer:
>>    case AsmToken::Minus:
>>    case AsmToken::Plus:
>> -    return (getParser().parseExpression(Res));
>> +    if (isParenExpr)
>> +      Result =  getParser().parseParenExpression(Res,S);
>> +    else
>> +      Result = (getParser().parseExpression(Res));
>> +  while (getLexer().getKind() == AsmToken::RParen)
>> +      Parser.Lex();
>> +   break;
>>    case AsmToken::Percent:
>> -    return parseRelocOperand(Res);
>> -  case AsmToken::LParen:
>> -    return false;  // it's probably assuming 0
>> +    Result = parseRelocOperand(Res);
>>    }
>> -  return true;
>> +  return Result;
>>  }
>>
>>  MipsAsmParser::OperandMatchResultTy MipsAsmParser::parseMemOperand(
>> @@ -1093,27 +1158,46 @@ MipsAsmParser::OperandMatchResultTy Mips
>>
>>    const MCExpr *IdVal = 0;
>>    SMLoc S;
>> -  // first operand is the offset
>> +  bool isParenExpr = false;
>> +  // First operand is the offset
>>    S = Parser.getTok().getLoc();
>>
>> -  if (parseMemOffset(IdVal))
>> -    return MatchOperand_ParseFail;
>> +  if (getLexer().getKind() == AsmToken::LParen) {
>> +    Parser.Lex();
>> +    isParenExpr = true;
>> +  }
>>
>> -  const AsmToken &Tok = Parser.getTok(); // get next token
>> -  if (Tok.isNot(AsmToken::LParen)) {
>> -    MipsOperand *Mnemonic = static_cast<MipsOperand*>(Operands[0]);
>> -    if (Mnemonic->getToken() == "la") {
>> -      SMLoc E = SMLoc::getFromPointer(Parser.getTok().getLoc().getPointer() -1);
>> -      Operands.push_back(MipsOperand::CreateImm(IdVal, S, E));
>> -      return MatchOperand_Success;
>> +  if (getLexer().getKind() != AsmToken::Dollar) {
>> +    if (parseMemOffset(IdVal,isParenExpr))
>> +      return MatchOperand_ParseFail;
>> +
>> +    const AsmToken &Tok = Parser.getTok(); // Get next token
>> +    if (Tok.isNot(AsmToken::LParen)) {
>> +      MipsOperand *Mnemonic = static_cast<MipsOperand*>(Operands[0]);
>> +      if (Mnemonic->getToken() == "la") {
>> +        SMLoc E = SMLoc::getFromPointer(
>> +            Parser.getTok().getLoc().getPointer() -1);
>> +        Operands.push_back(MipsOperand::CreateImm(IdVal, S, E));
>> +        return MatchOperand_Success;
>> +      }
>> +      if (Tok.is(AsmToken::EndOfStatement)) {
>> +        SMLoc E = SMLoc::getFromPointer(
>> +            Parser.getTok().getLoc().getPointer() -1);
>> +
>> +        // Zero register assumed, add memory operand with ZERO as base
>> +        Operands.push_back(MipsOperand::CreateMem(isMips64()?
>> +                                                  Mips::ZERO_64:Mips::ZERO,
>> +                                                  IdVal, S, E));
>> +        return MatchOperand_Success;
>> +      }
>> +      Error(Parser.getTok().getLoc(), "'(' expected");
>> +      return MatchOperand_ParseFail;
>>      }
>> -    Error(Parser.getTok().getLoc(), "'(' expected");
>> -    return MatchOperand_ParseFail;
>> -  }
>>
>> -  Parser.Lex(); // Eat '(' token.
>> +    Parser.Lex(); // Eat '(' token.
>> +  }
>>
>> -  const AsmToken &Tok1 = Parser.getTok(); // get next token
>> +  const AsmToken &Tok1 = Parser.getTok(); // Get next token
>>    if (Tok1.is(AsmToken::Dollar)) {
>>      Parser.Lex(); // Eat '$' token.
>>      if (tryParseRegisterOperand(Operands, isMips64())) {
>> @@ -1126,7 +1210,7 @@ MipsAsmParser::OperandMatchResultTy Mips
>>      return MatchOperand_ParseFail;
>>    }
>>
>> -  const AsmToken &Tok2 = Parser.getTok(); // get next token
>> +  const AsmToken &Tok2 = Parser.getTok(); // Get next token
>>    if (Tok2.isNot(AsmToken::RParen)) {
>>      Error(Parser.getTok().getLoc(), "')' expected");
>>      return MatchOperand_ParseFail;
>> @@ -1139,12 +1223,21 @@ MipsAsmParser::OperandMatchResultTy Mips
>>    if (IdVal == 0)
>>      IdVal = MCConstantExpr::Create(0, getContext());
>>
>> -  // now replace register operand with the mem operand
>> +  // Now replace register operand with the mem operand
>>    MipsOperand* op = static_cast<MipsOperand*>(Operands.back());
>>    int RegNo = op->getReg();
>> -  // remove register from operands
>> +  // Remove register from operands
>>    Operands.pop_back();
>> -  // and add memory operand
>> +  // And add memory operand
>> +  if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(IdVal)) {
>> +    int64_t Imm;
>> +    if (IdVal->EvaluateAsAbsolute(Imm))
>> +      IdVal = MCConstantExpr::Create(Imm, getContext());
>> +    else if (BE->getLHS()->getKind() != MCExpr::SymbolRef)
>> +      IdVal = MCBinaryExpr::Create(BE->getOpcode(), BE->getRHS(), BE->getLHS(),
>> +                                   getContext());
>> +  }
>> +
>>    Operands.push_back(MipsOperand::CreateMem(RegNo, IdVal, S, E));
>>    delete op;
>>    return MatchOperand_Success;
>> @@ -1160,13 +1253,13 @@ MipsAsmParser::parseCPU64Regs(SmallVecto
>>        return MatchOperand_Success;
>>      return MatchOperand_NoMatch;
>>    }
>> -  // if the first token is not '$' we have an error
>> +  // If the first token is not '$' we have an error
>>    if (Parser.getTok().isNot(AsmToken::Dollar))
>>      return MatchOperand_NoMatch;
>>
>>    Parser.Lex(); // Eat $
>>    if(!tryParseRegisterOperand(Operands, true)) {
>> -    // set the proper register kind
>> +    // Set the proper register kind
>>      MipsOperand* op = static_cast<MipsOperand*>(Operands.back());
>>      op->setRegKind(MipsOperand::Kind_CPU64Regs);
>>      return MatchOperand_Success;
>> @@ -1220,13 +1313,13 @@ MipsAsmParser::parseCPURegs(SmallVectorI
>>        return MatchOperand_Success;
>>      return MatchOperand_NoMatch;
>>    }
>> -  // if the first token is not '$' we have an error
>> +  // If the first token is not '$' we have an error
>>    if (Parser.getTok().isNot(AsmToken::Dollar))
>>      return MatchOperand_NoMatch;
>>
>>    Parser.Lex(); // Eat $
>>    if(!tryParseRegisterOperand(Operands, false)) {
>> -    // set the propper register kind
>> +    // Set the propper register kind
>>      MipsOperand* op = static_cast<MipsOperand*>(Operands.back());
>>      op->setRegKind(MipsOperand::Kind_CPURegs);
>>      return MatchOperand_Success;
>> @@ -1240,18 +1333,18 @@ MipsAsmParser::parseHWRegs(SmallVectorIm
>>    if (isMips64())
>>      return MatchOperand_NoMatch;
>>
>> -  // if the first token is not '$' we have error
>> +  // If the first token is not '$' we have error
>>    if (Parser.getTok().isNot(AsmToken::Dollar))
>>      return MatchOperand_NoMatch;
>>    SMLoc S = Parser.getTok().getLoc();
>>    Parser.Lex(); // Eat $
>>
>> -  const AsmToken &Tok = Parser.getTok(); // get next token
>> +  const AsmToken &Tok = Parser.getTok(); // Get next token
>>    if (Tok.isNot(AsmToken::Integer))
>>      return MatchOperand_NoMatch;
>>
>>    unsigned RegNum = Tok.getIntVal();
>> -  // at the moment only hwreg29 is supported
>> +  // At the moment only hwreg29 is supported
>>    if (RegNum != 29)
>>      return MatchOperand_ParseFail;
>>
>> @@ -1269,18 +1362,18 @@ MipsAsmParser::parseHW64Regs(SmallVector
>>
>>    if (!isMips64())
>>      return MatchOperand_NoMatch;
>> -    //if the first token is not '$' we have error
>> +    // If the first token is not '$' we have error
>>    if (Parser.getTok().isNot(AsmToken::Dollar))
>>      return MatchOperand_NoMatch;
>>    SMLoc S = Parser.getTok().getLoc();
>>    Parser.Lex(); // Eat $
>>
>> -  const AsmToken &Tok = Parser.getTok(); // get next token
>> +  const AsmToken &Tok = Parser.getTok(); // Get next token
>>    if (Tok.isNot(AsmToken::Integer))
>>      return MatchOperand_NoMatch;
>>
>>    unsigned RegNum = Tok.getIntVal();
>> -  // at the moment only hwreg29 is supported
>> +  // At the moment only hwreg29 is supported
>>    if (RegNum != 29)
>>      return MatchOperand_ParseFail;
>>
>> @@ -1296,20 +1389,20 @@ MipsAsmParser::parseHW64Regs(SmallVector
>>  MipsAsmParser::OperandMatchResultTy
>>  MipsAsmParser::parseCCRRegs(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
>>    unsigned RegNum;
>> -  //if the first token is not '$' we have error
>> +  // If the first token is not '$' we have error
>>    if (Parser.getTok().isNot(AsmToken::Dollar))
>>      return MatchOperand_NoMatch;
>>    SMLoc S = Parser.getTok().getLoc();
>>    Parser.Lex(); // Eat $
>>
>> -  const AsmToken &Tok = Parser.getTok(); // get next token
>> +  const AsmToken &Tok = Parser.getTok(); // Get next token
>>    if (Tok.is(AsmToken::Integer)) {
>>      RegNum = Tok.getIntVal();
>> -    // at the moment only fcc0 is supported
>> +    // At the moment only fcc0 is supported
>>      if (RegNum != 0)
>>        return MatchOperand_ParseFail;
>>    } else if (Tok.is(AsmToken::Identifier)) {
>> -    // at the moment only fcc0 is supported
>> +    // At the moment only fcc0 is supported
>>      if (Tok.getIdentifier() != "fcc0")
>>        return MatchOperand_ParseFail;
>>    } else
>> @@ -1376,16 +1469,16 @@ static int ConvertCcString(StringRef Con
>>  bool MipsAsmParser::
>>  parseMathOperation(StringRef Name, SMLoc NameLoc,
>>                     SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
>> -  // split the format
>> +  // Split the format
>>    size_t Start = Name.find('.'), Next = Name.rfind('.');
>>    StringRef Format1 = Name.slice(Start, Next);
>> -  // and add the first format to the operands
>> +  // And add the first format to the operands
>>    Operands.push_back(MipsOperand::CreateToken(Format1, NameLoc));
>> -  // now for the second format
>> +  // Now for the second format
>>    StringRef Format2 = Name.slice(Next, StringRef::npos);
>>    Operands.push_back(MipsOperand::CreateToken(Format2, NameLoc));
>>
>> -  // set the format for the first register
>> +  // Set the format for the first register
>>    setFpFormat(Format1);
>>
>>    // Read the remaining operands.
>> @@ -1405,7 +1498,7 @@ parseMathOperation(StringRef Name, SMLoc
>>      }
>>      Parser.Lex();  // Eat the comma.
>>
>> -    //set the format for the first register
>> +    // Set the format for the first register
>>      setFpFormat(Format2);
>>
>>      // Parse and remember the operand.
>> @@ -1430,7 +1523,7 @@ bool MipsAsmParser::
>>  ParseInstruction(ParseInstructionInfo &Info, StringRef Name, SMLoc NameLoc,
>>                   SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
>>    StringRef Mnemonic;
>> -  // floating point instructions: should register be treated as double?
>> +  // Floating point instructions: should register be treated as double?
>>    if (requestsDoubleOperand(Name)) {
>>      setFpFormat(FP_FORMAT_D);
>>    Operands.push_back(MipsOperand::CreateToken(Name, NameLoc));
>> @@ -1445,15 +1538,14 @@ ParseInstruction(ParseInstructionInfo &I
>>      Operands.push_back(MipsOperand::CreateToken(Mnemonic, NameLoc));
>>
>>      if (Next != StringRef::npos) {
>> -      // there is a format token in mnemonic
>> -      // StringRef Rest = Name.slice(Next, StringRef::npos);
>> +      // There is a format token in mnemonic
>>        size_t Dot = Name.find('.', Next+1);
>>        StringRef Format = Name.slice(Next, Dot);
>> -      if (Dot == StringRef::npos) //only one '.' in a string, it's a format
>> +      if (Dot == StringRef::npos) // Only one '.' in a string, it's a format
>>          Operands.push_back(MipsOperand::CreateToken(Format, NameLoc));
>>        else {
>>          if (Name.startswith("c.")){
>> -          // floating point compare, add '.' and immediate represent for cc
>> +          // Floating point compare, add '.' and immediate represent for cc
>>            Operands.push_back(MipsOperand::CreateToken(".", NameLoc));
>>            int Cc = ConvertCcString(Format);
>>            if (Cc == -1) {
>> @@ -1640,12 +1732,12 @@ bool MipsAsmParser::parseSetAssignment()
>>
>>    if (getLexer().isNot(AsmToken::Comma))
>>      return reportParseError("unexpected token in .set directive");
>> -  Lex(); //eat comma
>> +  Lex(); // Eat comma
>>
>>    if (Parser.parseExpression(Value))
>>      reportParseError("expected valid expression after comma");
>>
>> -  // check if the Name already exists as a symbol
>> +  // Check if the Name already exists as a symbol
>>    MCSymbol *Sym = getContext().LookupSymbol(Name);
>>    if (Sym) {
>>      return reportParseError("symbol already defined");
>> @@ -1657,7 +1749,7 @@ bool MipsAsmParser::parseSetAssignment()
>>  }
>>  bool MipsAsmParser::parseDirectiveSet() {
>>
>> -  // get next token
>> +  // Get next token
>>    const AsmToken &Tok = Parser.getTok();
>>
>>    if (Tok.getString() == "noat") {
>> @@ -1673,11 +1765,11 @@ bool MipsAsmParser::parseDirectiveSet()
>>    } else if (Tok.getString() == "nomacro") {
>>      return parseSetNoMacroDirective();
>>    } else if (Tok.getString() == "nomips16") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.eatToEndOfStatement();
>>      return false;
>>    } else if (Tok.getString() == "nomicromips") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.eatToEndOfStatement();
>>      return false;
>>    } else {
>> @@ -1719,19 +1811,19 @@ bool MipsAsmParser::ParseDirective(AsmTo
>>    StringRef IDVal = DirectiveID.getString();
>>
>>    if ( IDVal == ".ent") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.Lex();
>>      return false;
>>    }
>>
>>    if (IDVal == ".end") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.Lex();
>>      return false;
>>    }
>>
>>    if (IDVal == ".frame") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.eatToEndOfStatement();
>>      return false;
>>    }
>> @@ -1741,19 +1833,19 @@ bool MipsAsmParser::ParseDirective(AsmTo
>>    }
>>
>>    if (IDVal == ".fmask") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.eatToEndOfStatement();
>>      return false;
>>    }
>>
>>    if (IDVal == ".mask") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.eatToEndOfStatement();
>>      return false;
>>    }
>>
>>    if (IDVal == ".gpword") {
>> -    // ignore this directive for now
>> +    // Ignore this directive for now
>>      Parser.eatToEndOfStatement();
>>      return false;
>>    }
>>
>> Modified: llvm/trunk/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp?rev=179657&r1=179656&r2=179657&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp (original)
>> +++ llvm/trunk/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp Tue Apr 16 19:18:04 2013
>> @@ -88,6 +88,9 @@ public:
>>    unsigned getSizeInsEncoding(const MCInst &MI, unsigned OpNo,
>>                                SmallVectorImpl<MCFixup> &Fixups) const;
>>
>> +  unsigned
>> +  getExprOpValue(const MCExpr *Expr,SmallVectorImpl<MCFixup> &Fixups) const;
>> +
>>  }; // class MipsMCCodeEmitter
>>  }  // namespace
>>
>> @@ -192,35 +195,24 @@ getJumpTargetOpValue(const MCInst &MI, u
>>    return 0;
>>  }
>>
>> -/// getMachineOpValue - Return binary encoding of operand. If the machine
>> -/// operand requires relocation, record the relocation and return zero.
>>  unsigned MipsMCCodeEmitter::
>> -getMachineOpValue(const MCInst &MI, const MCOperand &MO,
>> -                  SmallVectorImpl<MCFixup> &Fixups) const {
>> -  if (MO.isReg()) {
>> -    unsigned Reg = MO.getReg();
>> -    unsigned RegNo = Ctx.getRegisterInfo().getEncodingValue(Reg);
>> -    return RegNo;
>> -  } else if (MO.isImm()) {
>> -    return static_cast<unsigned>(MO.getImm());
>> -  } else if (MO.isFPImm()) {
>> -    return static_cast<unsigned>(APFloat(MO.getFPImm())
>> -        .bitcastToAPInt().getHiBits(32).getLimitedValue());
>> -  }
>> +getExprOpValue(const MCExpr *Expr,SmallVectorImpl<MCFixup> &Fixups) const {
>> +  int64_t Res;
>>
>> -  // MO must be an Expr.
>> -  assert(MO.isExpr());
>> +  if (Expr->EvaluateAsAbsolute(Res))
>> +    return Res;
>>
>> -  const MCExpr *Expr = MO.getExpr();
>>    MCExpr::ExprKind Kind = Expr->getKind();
>> +  if (Kind == MCExpr::Constant) {
>> +    return cast<MCConstantExpr>(Expr)->getValue();
>> +  }
>>
>>    if (Kind == MCExpr::Binary) {
>> -    Expr = static_cast<const MCBinaryExpr*>(Expr)->getLHS();
>> -    Kind = Expr->getKind();
>> +    unsigned Res = getExprOpValue(cast<MCBinaryExpr>(Expr)->getLHS(), Fixups);
>> +    Res += getExprOpValue(cast<MCBinaryExpr>(Expr)->getRHS(), Fixups);
>> +    return Res;
>>    }
>> -
>> -  assert (Kind == MCExpr::SymbolRef);
>> -
>> +  if (Kind == MCExpr::SymbolRef) {
>>    Mips::Fixups FixupKind = Mips::Fixups(0);
>>
>>    switch(cast<MCSymbolRefExpr>(Expr)->getKind()) {
>> @@ -300,12 +292,32 @@ getMachineOpValue(const MCInst &MI, cons
>>      break;
>>    } // switch
>>
>> -  Fixups.push_back(MCFixup::Create(0, MO.getExpr(), MCFixupKind(FixupKind)));
>> -
>> -  // All of the information is in the fixup.
>> +    Fixups.push_back(MCFixup::Create(0, Expr, MCFixupKind(FixupKind)));
>> +    return 0;
>> +  }
>>    return 0;
>>  }
>>
>> +/// getMachineOpValue - Return binary encoding of operand. If the machine
>> +/// operand requires relocation, record the relocation and return zero.
>> +unsigned MipsMCCodeEmitter::
>> +getMachineOpValue(const MCInst &MI, const MCOperand &MO,
>> +                  SmallVectorImpl<MCFixup> &Fixups) const {
>> +  if (MO.isReg()) {
>> +    unsigned Reg = MO.getReg();
>> +    unsigned RegNo = Ctx.getRegisterInfo().getEncodingValue(Reg);
>> +    return RegNo;
>> +  } else if (MO.isImm()) {
>> +    return static_cast<unsigned>(MO.getImm());
>> +  } else if (MO.isFPImm()) {
>> +    return static_cast<unsigned>(APFloat(MO.getFPImm())
>> +        .bitcastToAPInt().getHiBits(32).getLimitedValue());
>> +  }
>> +  // MO must be an Expr.
>> +  assert(MO.isExpr());
>> +  return getExprOpValue(MO.getExpr(),Fixups);
>> +}
>> +
>>  /// getMemEncoding - Return binary encoding of memory related operand.
>>  /// If the offset operand requires relocation, record the relocation.
>>  unsigned
>>
>> Added: llvm/trunk/test/MC/Mips/expr1.s
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/Mips/expr1.s?rev=179657&view=auto
>> ==============================================================================
>> --- llvm/trunk/test/MC/Mips/expr1.s (added)
>> +++ llvm/trunk/test/MC/Mips/expr1.s Tue Apr 16 19:18:04 2013
>> @@ -0,0 +1,26 @@
>> +# RUN: llvm-mc  %s -triple=mipsel-unknown-linux -show-encoding -mcpu=mips32r2 | FileCheck %s
>> +# Check that the assembler can handle the expressions as operands.
>> +# CHECK:  .text
>> +# CHECK:  .globl  foo
>> +# CHECK:  foo:
>> +# CHECK:  lw   $4, %lo(foo)($4)    # encoding: [A,A,0x84,0x8c]
>> +# CHECK:                           #   fixup A - offset: 0, value: foo at ABS_LO, kind: fixup_Mips_LO16
>> +# CHECK:  lw   $4, 56($4)          # encoding: [0x38,0x00,0x84,0x8c]
>> +# CHECK:  lw   $4, %lo(foo+8)($4)  # encoding: [0x08'A',A,0x84,0x8c]
>> +# CHECK:                           #   fixup A - offset: 0, value: foo at ABS_LO, kind: fixup_Mips_LO16
>> +# CHECK:  lw   $4, %lo(foo+8)($4)  # encoding: [0x08'A',A,0x84,0x8c]
>> +# CHECK:                           #   fixup A - offset: 0, value: foo at ABS_LO, kind: fixup_Mips_LO16
>> +# CHECK:  lw   $4, %lo(foo+8)($4)  # encoding: [0x08'A',A,0x84,0x8c]
>> +# CHECK:                           #   fixup A - offset: 0, value: foo at ABS_LO, kind: fixup_Mips_LO16
>> +# CHECK:  .space  64
>> +
>> +  .globl  foo
>> +  .ent  foo
>> +foo:
>> +  lw  $4,%lo(foo)($4)
>> +  lw  $4,((10 + 4) * 4)($4)
>> +  lw  $4,%lo (2 * 4) + foo($4)
>> +  lw  $4,%lo((2 * 4) + foo)($4)
>> +  lw  $4,(((%lo ((2 * 4) + foo))))($4)
>> +  .space  64
>> +  .end  foo
>>
>>
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