tools/llvm-mc/AsmParser.h

   1 //===- AsmParser.h - Parser for Assembly Files ------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This class declares the parser for assembly files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ASMPARSER_H
  15 #define ASMPARSER_H
  16
  17 #include <vector>
  18 #include "AsmLexer.h"
  19 #include "AsmCond.h"
  20 #include "llvm/MC/MCAsmParser.h"
  21 #include "llvm/MC/MCSectionMachO.h"
  22 #include "llvm/MC/MCStreamer.h"
  23 #include "llvm/MC/MCAsmInfo.h"
  24
  25 namespace llvm {
  26 class AsmCond;
  27 class MCContext;
  28 class MCExpr;
  29 class MCInst;
  30 class MCStreamer;
  31 class MCAsmInfo;
  32 class MCValue;
  33 class TargetAsmParser;
  34 class Twine;
  35
  36 class AsmParser : public MCAsmParser {
  37 private:
  38   AsmLexer Lexer;
  39   MCContext &Ctx;
  40   MCStreamer &Out;
  41   TargetAsmParser *TargetParser;
  42
  43   AsmCond TheCondState;
  44   std::vector<AsmCond> TheCondStack;
  45
  46   // FIXME: Figure out where this should leave, the code is a copy of that which
  47   // is also used by TargetLoweringObjectFile.
  48   mutable void *SectionUniquingMap;
  49
  50 public:
  51   AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
  52             const MCAsmInfo &_MAI)
  53     : Lexer(_SM, _MAI), Ctx(_Ctx), Out(_Out), TargetParser(0),
  54       SectionUniquingMap(0) {}
  55   ~AsmParser();
  56
  57   bool Run();
  58
  59 public:
  60   TargetAsmParser &getTargetParser() const { return *TargetParser; }
  61   void setTargetParser(TargetAsmParser &P) { TargetParser = &P; }
  62
  63   /// @name MCAsmParser Interface
  64   /// {
  65
  66   virtual MCAsmLexer &getLexer() { return Lexer; }
  67
  68   virtual MCContext &getContext() { return Ctx; }
  69
  70   virtual MCStreamer &getStreamer() { return Out; }
  71
  72   virtual void Warning(SMLoc L, const Twine &Meg);
  73
  74   virtual bool Error(SMLoc L, const Twine &Msg);
  75
  76   virtual bool ParseExpression(const MCExpr *&Res);
  77
  78   virtual bool ParseParenExpression(const MCExpr *&Res);
  79
  80   virtual bool ParseAbsoluteExpression(int64_t &Res);
  81
  82   /// }
  83
  84 private:
  85   MCSymbol *CreateSymbol(StringRef Name);
  86
  87   // FIXME: See comment on SectionUniquingMap.
  88   const MCSection *getMachOSection(const StringRef &Segment,
  89                                    const StringRef &Section,
  90                                    unsigned TypeAndAttributes,
  91                                    unsigned Reserved2,
  92                                    SectionKind Kind) const;
  93
  94   bool ParseStatement();
  95
  96   bool TokError(const char *Msg);
  97
  98   bool ParseConditionalAssemblyDirectives(StringRef Directive,
  99                                           SMLoc DirectiveLoc);
 100   void EatToEndOfStatement();
 101
 102   bool ParseAssignment(const StringRef &Name);
 103
 104   bool ParsePrimaryExpr(const MCExpr *&Res);
 105   bool ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res);
 106   bool ParseParenExpr(const MCExpr *&Res);
 107
 108   /// ParseIdentifier - Parse an identifier or string (as a quoted identifier)
 109   /// and set \arg Res to the identifier contents.
 110   bool ParseIdentifier(StringRef &Res);
 111
 112   // Directive Parsing.
 113   bool ParseDirectiveDarwinSection(); // Darwin specific ".section".
 114   bool ParseDirectiveSectionSwitch(const char *Segment, const char *Section,
 115                                    unsigned TAA = 0, unsigned ImplicitAlign = 0,
 116                                    unsigned StubSize = 0);
 117   bool ParseDirectiveAscii(bool ZeroTerminated); // ".ascii", ".asciiz"
 118   bool ParseDirectiveValue(unsigned Size); // ".byte", ".long", ...
 119   bool ParseDirectiveFill(); // ".fill"
 120   bool ParseDirectiveSpace(); // ".space"
 121   bool ParseDirectiveSet(); // ".set"
 122   bool ParseDirectiveOrg(); // ".org"
 123   // ".align{,32}", ".p2align{,w,l}"
 124   bool ParseDirectiveAlign(bool IsPow2, unsigned ValueSize);
 125
 126   /// ParseDirectiveSymbolAttribute - Parse a directive like ".globl" which
 127   /// accepts a single symbol (which should be a label or an external).
 128   bool ParseDirectiveSymbolAttribute(MCStreamer::SymbolAttr Attr);
 129   bool ParseDirectiveDarwinSymbolDesc(); // Darwin specific ".desc"
 130   bool ParseDirectiveDarwinLsym(); // Darwin specific ".lsym"
 131
 132   bool ParseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
 133   bool ParseDirectiveDarwinZerofill(); // Darwin specific ".zerofill"
 134
 135   // Darwin specific ".subsections_via_symbols"
 136   bool ParseDirectiveDarwinSubsectionsViaSymbols();
 137   // Darwin specific .dump and .load
 138   bool ParseDirectiveDarwinDumpOrLoad(SMLoc IDLoc, bool IsDump);
 139
 140   bool ParseDirectiveAbort(); // ".abort"
 141   bool ParseDirectiveInclude(); // ".include"
 142
 143   bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if"
 144   bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
 145   bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else"
 146   bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
 147
 148   bool ParseDirectiveFile(SMLoc DirectiveLoc); // ".file"
 149   bool ParseDirectiveLine(SMLoc DirectiveLoc); // ".line"
 150   bool ParseDirectiveLoc(SMLoc DirectiveLoc); // ".loc"
 151
 152   /// ParseEscapedString - Parse the current token as a string which may include
 153   /// escaped characters and return the string contents.
 154   bool ParseEscapedString(std::string &Data);
 155 };
 156
 157 } // end namespace llvm
 158
 159 #endif