interpretor/preprocessor/faust-0.9.47mr3/compiler/headers/node.hh

   1 /************************************************************************
   2  ************************************************************************
   3     FAUST compiler
   4         Copyright (C) 2003-2004 GRAME, Centre National de Creation Musicale
   5     ---------------------------------------------------------------------
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
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   9     (at your option) any later version.
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  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  ************************************************************************
  20  ************************************************************************/
  21
  22
  23
  24 /*****************************************************************************
  25 ******************************************************************************/
  26
  27 /** \file node.hh
  28  * A Node is a tagged unions of int, double, symbol and void* used in the implementation of CTrees.
  29  * Nodes are completly described by the node.h file, there is no node.cpp file.
  30  *
  31  * <b>API:</b>
  32  *
  33  *      Node(symbol("abcd"));   : node with symbol content
  34  *      Node(10);                               : node with int content
  35  *      Node(3.14159);                  : node with double content
  36  *
  37  *      n->type();                              : kIntNode or kDoubleNode or kSymNode
  38  *
  39  *      n->getInt();                    : int content of n
  40  *      n->getDouble();                 : double content of n
  41  *      n->getSym();                    : symbol content of n
  42  *
  43  *      if (isInt(n, &i))       ... : int i = int content of n
  44  *      if (isDouble(n, &f))    ... : double f = double content of n
  45  *      if (isSym(n, &s))       ... : Sym s = Sym content of n
  46  *
  47  */
  48
  49 /******************************************************************************
  50 *****************************************************************************/
  51
  52
  53 #ifndef     __NODE__
  54 #define     __NODE__
  55
  56 #include <iostream>
  57 #include "symbol.hh"
  58
  59 using namespace std;
  60
  61 /**
  62  * Tags used to define the type of a Node
  63  */
  64 enum { kIntNode, kDoubleNode, kSymNode, kPointerNode };
  65
  66
  67 /**
  68  * Class Node = (type x (int + double + Sym + void*))
  69  */
  70 class Node
  71 {
  72         int             fType;
  73         union {
  74                 int     i;
  75                 double  f;
  76                 Sym     s;
  77                 void*   p;
  78         } fData;
  79
  80  public:
  81         // constructeurs (assume size of field f is the biggest)
  82         Node (int x)                            : fType(kIntNode)               { fData.f = 0; fData.i = x; }
  83         Node (double x)                         : fType(kDoubleNode)    { fData.f = x; }
  84         Node (const char* name)         : fType(kSymNode)               { fData.f = 0; fData.s = symbol(name); }
  85         Node (const string& name)       : fType(kSymNode)               { fData.f = 0; fData.s = symbol(name); }
  86         Node (Sym x)                            : fType(kSymNode)               { fData.f = 0; fData.s = x; }
  87         Node (void* x)                          : fType(kPointerNode)   { fData.f = 0; fData.p = x; }
  88
  89     Node (const Node& n)        : fType(n.fType)        { fData = n.fData; }
  90
  91         // predicats
  92         bool operator == (const Node& n) const { return fType == n.fType && fData.f == n.fData.f; }
  93         bool operator != (const Node& n) const { return fType != n.fType || fData.f != n.fData.f; }
  94
  95         // accessors
  96         int             type()          const   { return fType; }
  97
  98         int             getInt()                const   { return fData.i; }
  99         double  getDouble()     const   { return fData.f; }
 100         Sym     getSym()                const   { return fData.s; }
 101         void*   getPointer()    const   { return fData.p; }
 102
 103         // conversions and promotion for numbers
 104         operator int()   const      { return (fType == kIntNode) ? fData.i : (fType == kDoubleNode) ? int(fData.f) : 0 ; }
 105     operator double() const     { return (fType == kIntNode) ? double(fData.i) : (fType == kDoubleNode) ? fData.f : 0.0 ; }
 106
 107         ostream&        print (ostream& fout) const;                                    ///< print a node on a stream
 108 };
 109
 110 //printing
 111 inline ostream& operator << (ostream& s, const Node& n) { return n.print(s); }
 112
 113
 114
 115 //-------------------------------------------------------------------------
 116 // Perdicates and pattern matching
 117 //-------------------------------------------------------------------------
 118
 119 // integers
 120 inline bool isInt (const Node& n)
 121 {
 122         return (n.type() == kIntNode);
 123 }
 124
 125 inline bool isInt (const Node& n, int* x)
 126 {
 127         if (n.type() == kIntNode) {
 128                 *x = n.getInt();
 129                 return true;
 130         } else {
 131                 return false;
 132         }
 133 }
 134
 135
 136 // floats
 137 inline bool isDouble (const Node& n)
 138 {
 139         return (n.type() == kDoubleNode);
 140 }
 141
 142 inline bool isDouble (const Node& n, double* x)
 143 {
 144         if (n.type() == kDoubleNode) {
 145                 *x = n.getDouble();
 146                 return true;
 147         } else {
 148                 return false;
 149         }
 150 }
 151
 152
 153
 154 inline bool isZero (const Node& n)
 155 {
 156         return (n.type() == kDoubleNode) && (n.getDouble() == 0.0)
 157                 || (n.type() == kIntNode) && (n.getInt() == 0);
 158 }
 159
 160 inline bool isGEZero (const Node& n)
 161 {
 162         return (n.type() == kDoubleNode) && (n.getDouble() >= 0.0)
 163                 || (n.type() == kIntNode) && (n.getInt() >= 0);
 164 }
 165
 166 inline bool isGTZero (const Node& n)
 167 {
 168         return (n.type() == kDoubleNode) && (n.getDouble() > 0.0)
 169                 || (n.type() == kIntNode) && (n.getInt() > 0);
 170 }
 171
 172 inline bool isOne (const Node& n)
 173 {
 174         return (n.type() == kDoubleNode) && (n.getDouble() == 1.0)
 175                 || (n.type() == kIntNode) && (n.getInt() == 1);
 176 }
 177
 178 inline bool isMinusOne (const Node& n)
 179 {
 180         return (n.type() == kDoubleNode) && (n.getDouble() == -1.0)
 181                 || (n.type() == kIntNode) && (n.getInt() == -1);
 182 }
 183
 184
 185 // numbers in general
 186 inline bool isNum (const Node& n)
 187 {
 188         return isInt(n)||isDouble(n);
 189 }
 190
 191
 192 // symbols
 193 inline bool isSym (const Node& n)
 194 {
 195         return (n.type() == kSymNode);
 196 }
 197
 198 inline bool isSym (const Node& n, Sym* x)
 199 {
 200         if (n.type() == kSymNode) {
 201                 *x = n.getSym();
 202                 return true;
 203         } else {
 204                 return false;
 205         }
 206 }
 207
 208
 209 // void pointer
 210 inline bool isPointer (const Node& n)
 211 {
 212         return (n.type() == kPointerNode);
 213 }
 214
 215 inline bool isPointer (const Node& n, void** x)
 216 {
 217         if (n.type() == kPointerNode) {
 218                 *x = n.getPointer();
 219                 return true;
 220         } else {
 221                 return false;
 222         }
 223 }
 224
 225
 226
 227
 228 //-------------------------------------------------------------------------
 229 // Mathematical operations on nodes
 230 //-------------------------------------------------------------------------
 231
 232
 233 // arithmetic operations
 234
 235 inline const Node addNode (const Node& x, const Node& y)
 236         { return (isDouble(x)||isDouble(y)) ? Node(double(x)+double(y)) : Node(int(x)+int(y)); }
 237
 238 inline const Node subNode (const Node& x, const Node& y)
 239         { return (isDouble(x)||isDouble(y)) ? Node(double(x)-double(y)) : Node(int(x)-int(y)); }
 240
 241 inline const Node mulNode (const Node& x, const Node& y)
 242         { return (isDouble(x)||isDouble(y)) ? Node(double(x)*double(y)) : Node(int(x)*int(y)); }
 243
 244 inline const Node divNode (const Node& x, const Node& y)
 245         { return (isDouble(x)||isDouble(y)) ? Node(double(x)/double(y)) : Node(int(x)/int(y)); }
 246
 247 inline const Node divExtendedNode (const Node& x, const Node& y)
 248         { return  (isDouble(x)||isDouble(y)) ? Node(double(x)/double(y))
 249                         : (double(int(x)/int(y))==double(x)/double(y)) ? Node(int(x)/int(y))
 250                         : Node(double(x)/double(y)); }
 251
 252 inline const Node remNode (const Node& x, const Node& y)
 253         { return Node(int(x)%int(y)); }
 254
 255 // inverse functions
 256
 257 inline const Node minusNode (const Node& x)
 258         { return subNode(0, x); }
 259
 260 inline const Node inverseNode (const Node& x)
 261         { return divNode(1.0f, x); }
 262
 263
 264 // bit shifting operations
 265
 266 inline const Node lshNode (const Node& x, const Node& y)
 267         { return Node(int(x)<<int(y)); }
 268
 269 inline const Node rshNode (const Node& x, const Node& y)
 270         { return Node(int(x)>>int(y)); }
 271
 272
 273 // boolean operations on bits
 274
 275 inline const Node andNode (const Node& x, const Node& y)
 276         { return Node(int(x)&int(y)); }
 277
 278 inline const Node orNode (const Node& x, const Node& y)
 279         { return Node(int(x)|int(y)); }
 280
 281 inline const Node xorNode (const Node& x, const Node& y)
 282         { return Node(int(x)^int(y)); }
 283
 284
 285 // compare operations
 286
 287 inline const Node gtNode (const Node& x, const Node& y)
 288         { return (isDouble(x)||isDouble(y)) ? Node(double(x)>double(y)) : Node(int(x)>int(y)); }
 289
 290 inline const Node ltNode (const Node& x, const Node& y)
 291         { return (isDouble(x)||isDouble(y)) ? Node(double(x)<double(y)) : Node(int(x)<int(y)); }
 292
 293 inline const Node geNode (const Node& x, const Node& y)
 294         { return (isDouble(x)||isDouble(y)) ? Node(double(x)>=double(y)) : Node(int(x)>=int(y)); }
 295
 296 inline const Node leNode (const Node& x, const Node& y)
 297         { return (isDouble(x)||isDouble(y)) ? Node(double(x)<=double(y)) : Node(int(x)<=int(y)); }
 298 #if 1
 299 inline const Node eqNode (const Node& x, const Node& y)
 300         { return (isDouble(x)||isDouble(y)) ? Node(double(x)==double(y)) : Node(int(x)==int(y)); }
 301
 302 inline const Node neNode (const Node& x, const Node& y)
 303         { return (isDouble(x)||isDouble(y)) ? Node(double(x)!=double(y)) : Node(int(x)!=int(y)); }
 304 #endif
 305
 306
 307
 308 #endif