lib/AsmParser/ParserInternals.h

   1 //===-- ParserInternals.h - Definitions internal to the parser --*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  This header file defines the various variables that are shared among the
  11 //  different components of the parser...
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef PARSER_INTERNALS_H
  16 #define PARSER_INTERNALS_H
  17
  18 #include "llvm/Constants.h"
  19 #include "llvm/DerivedTypes.h"
  20 #include "llvm/Function.h"
  21 #include "llvm/Instructions.h"
  22 #include "llvm/Assembly/Parser.h"
  23 #include "llvm/ADT/StringExtras.h"
  24
  25
  26 // Global variables exported from the lexer...
  27
  28 extern int llvmAsmlineno;
  29
  30 extern std::string &llvmAsmTextin;
  31
  32 // functions exported from the lexer
  33 void set_scan_file(FILE * F);
  34 void set_scan_string (const char * str);
  35
  36 // Globals exported by the parser...
  37 extern char* llvmAsmtext;
  38 extern int   llvmAsmleng;
  39
  40 namespace llvm {
  41
  42 // Globals exported by the parser...
  43 extern std::string CurFilename;
  44
  45 class Module;
  46 Module *RunVMAsmParser(const std::string &Filename, FILE *F);
  47
  48 // Parse a string directly
  49 Module *RunVMAsmParser(const char * AsmString, Module * M);
  50
  51
  52 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
  53 // appropriate character.  If AllowNull is set to false, a \00 value will cause
  54 // an exception to be thrown.
  55 //
  56 // If AllowNull is set to true, the return value of the function points to the
  57 // last character of the string in memory.
  58 //
  59 char *UnEscapeLexed(char *Buffer, bool AllowNull = false);
  60
  61
  62 // ThrowException - Wrapper around the ParseException class that automatically
  63 // fills in file line number and column number and options info.
  64 //
  65 // This also helps me because I keep typing 'throw new ParseException' instead
  66 // of just 'throw ParseException'... sigh...
  67 //
  68 static inline void ThrowException(const std::string &message,
  69                                   int LineNo = -1) {
  70   if (LineNo == -1) LineNo = llvmAsmlineno;
  71   // TODO: column number in exception
  72   throw ParseException(CurFilename, message, LineNo);
  73 }
  74
  75 /// InlineAsmDescriptor - This is a simple class that holds info about inline
  76 /// asm blocks, for use by ValID.
  77 struct InlineAsmDescriptor {
  78   std::string AsmString, Constraints;
  79   bool HasSideEffects;
  80
  81   InlineAsmDescriptor(const std::string &as, const std::string &c, bool HSE)
  82     : AsmString(as), Constraints(c), HasSideEffects(HSE) {}
  83 };
  84
  85
  86 // ValID - Represents a reference of a definition of some sort.  This may either
  87 // be a numeric reference or a symbolic (%var) reference.  This is just a
  88 // discriminated union.
  89 //
  90 // Note that I can't implement this class in a straight forward manner with
  91 // constructors and stuff because it goes in a union.
  92 //
  93 struct ValID {
  94   enum {
  95     NumberVal, NameVal, ConstSIntVal, ConstUIntVal, ConstFPVal, ConstNullVal,
  96     ConstUndefVal, ConstZeroVal, ConstantVal, InlineAsmVal
  97   } Type;
  98
  99   union {
 100     int      Num;         // If it's a numeric reference
 101     char    *Name;        // If it's a named reference.  Memory must be free'd.
 102     int64_t  ConstPool64; // Constant pool reference.  This is the value
 103     uint64_t UConstPool64;// Unsigned constant pool reference.
 104     double   ConstPoolFP; // Floating point constant pool reference
 105     Constant *ConstantValue; // Fully resolved constant for ConstantVal case.
 106     InlineAsmDescriptor *IAD;
 107   };
 108
 109   static ValID create(int Num) {
 110     ValID D; D.Type = NumberVal; D.Num = Num; return D;
 111   }
 112
 113   static ValID create(char *Name) {
 114     ValID D; D.Type = NameVal; D.Name = Name; return D;
 115   }
 116
 117   static ValID create(int64_t Val) {
 118     ValID D; D.Type = ConstSIntVal; D.ConstPool64 = Val; return D;
 119   }
 120
 121   static ValID create(uint64_t Val) {
 122     ValID D; D.Type = ConstUIntVal; D.UConstPool64 = Val; return D;
 123   }
 124
 125   static ValID create(double Val) {
 126     ValID D; D.Type = ConstFPVal; D.ConstPoolFP = Val; return D;
 127   }
 128
 129   static ValID createNull() {
 130     ValID D; D.Type = ConstNullVal; return D;
 131   }
 132
 133   static ValID createUndef() {
 134     ValID D; D.Type = ConstUndefVal; return D;
 135   }
 136
 137   static ValID createZeroInit() {
 138     ValID D; D.Type = ConstZeroVal; return D;
 139   }
 140
 141   static ValID create(Constant *Val) {
 142     ValID D; D.Type = ConstantVal; D.ConstantValue = Val; return D;
 143   }
 144
 145   static ValID createInlineAsm(const std::string &AsmString,
 146                                const std::string &Constraints,
 147                                bool HasSideEffects) {
 148     ValID D;
 149     D.Type = InlineAsmVal;
 150     D.IAD = new InlineAsmDescriptor(AsmString, Constraints, HasSideEffects);
 151     return D;
 152   }
 153
 154   inline void destroy() const {
 155     if (Type == NameVal)
 156       free(Name);    // Free this strdup'd memory.
 157     else if (Type == InlineAsmVal)
 158       delete IAD;
 159   }
 160
 161   inline ValID copy() const {
 162     if (Type != NameVal) return *this;
 163     ValID Result = *this;
 164     Result.Name = strdup(Name);
 165     return Result;
 166   }
 167
 168   inline std::string getName() const {
 169     switch (Type) {
 170     case NumberVal     : return std::string("#") + itostr(Num);
 171     case NameVal       : return Name;
 172     case ConstFPVal    : return ftostr(ConstPoolFP);
 173     case ConstNullVal  : return "null";
 174     case ConstUndefVal : return "undef";
 175     case ConstZeroVal  : return "zeroinitializer";
 176     case ConstUIntVal  :
 177     case ConstSIntVal  : return std::string("%") + itostr(ConstPool64);
 178     case ConstantVal:
 179       if (ConstantValue == ConstantBool::True) return "true";
 180       if (ConstantValue == ConstantBool::False) return "false";
 181       return "<constant expression>";
 182     default:
 183       assert(0 && "Unknown value!");
 184       abort();
 185       return "";
 186     }
 187   }
 188
 189   bool operator<(const ValID &V) const {
 190     if (Type != V.Type) return Type < V.Type;
 191     switch (Type) {
 192     case NumberVal:     return Num < V.Num;
 193     case NameVal:       return strcmp(Name, V.Name) < 0;
 194     case ConstSIntVal:  return ConstPool64  < V.ConstPool64;
 195     case ConstUIntVal:  return UConstPool64 < V.UConstPool64;
 196     case ConstFPVal:    return ConstPoolFP  < V.ConstPoolFP;
 197     case ConstNullVal:  return false;
 198     case ConstUndefVal: return false;
 199     case ConstZeroVal: return false;
 200     case ConstantVal:   return ConstantValue < V.ConstantValue;
 201     default:  assert(0 && "Unknown value type!"); return false;
 202     }
 203   }
 204 };
 205
 206 } // End llvm namespace
 207
 208 #endif