interpretor/preprocessor/faust-0.9.47mr3/compiler/generator/occurences.hh

   1 #ifndef __OCCURENCES__
   2 #define __OCCURENCES__
   3
   4 #include "tlib.hh"
   5
   6
   7 class Occurences
   8 {
   9         const int       fXVariability;          ///< Extended Variability of the expression
  10         int                     fOccurences[4];         ///< Occurences count according to Contexts
  11         bool            fMultiOcc;                      ///< True when exp has multiple occ. or occ. in higher ctxt
  12         bool            fOutDelayOcc;           ///< True when exp has at least one occ. outside a delay
  13     int                 fMinDelay;                      ///< Minimal fix delay usage
  14     int                 fMaxDelay;                      ///< Maximal fix delay usage
  15
  16  public:
  17         Occurences(int v, int r);
  18
  19         Occurences* incOccurences(int v, int r, int d); ///< inc occurences in context v,r,d
  20
  21         bool            hasMultiOccurences() const;                     ///< true if multiple occurences or occ. in higher ctxt
  22         bool            hasOutDelayOccurences() const;          ///< true if has occurences outside a a delay
  23     int                 getMaxDelay() const;                            ///< return the maximal delay collected
  24     int                 getMinDelay() const;                            ///< return the minimal delay collected
  25 };
  26
  27
  28 /**
  29  * Occurences Markup of a root tree. First create an OccMarkup om,
  30  * second om.mark(root) then om.retrieve(subtree)
  31  */
  32 class OccMarkup
  33 {
  34         Tree            fRootTree;                                                              ///< occurences computed within this tree
  35         Tree            fPropKey;                                                               ///< key used to store occurences property
  36
  37         void            incOcc (Tree env, int v, int r, int d, Tree t); ///< inc the occurence of t in context v,r
  38         Occurences* getOcc (Tree t);                                            ///< get Occurences property of t or null
  39         void            setOcc (Tree t, Occurences* occ);               ///< set Occurences property of t
  40
  41  public:
  42         void            mark(Tree root);                                                ///< start markup of root tree with new unique key
  43         Occurences* retrieve(Tree t);                                           ///< occurences of subtree t within root tree
  44 };
  45
  46
  47
  48 #endif