git.sur5r.net Git - cc65/blob - src/ca65/studyexpr.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                studyexpr.h                                */
   4 /*                                                                           */
   5 /*                         Study an expression tree                          */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2003-2012,  Ullrich von Bassewitz                                     */
  10 /*                 Roemerstrasse 52                                          */
  11 /*                 D-70794 Filderstadt                                       */
  12 /* EMail:          uz@cc65.org                                               */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #ifndef STUDYEXPR_H
  37 #define STUDYEXPR_H
  38
  39
  40
  41 /* common */
  42 #include "exprdefs.h"
  43
  44
  45
  46 /*****************************************************************************/
  47 /*                                   Data                                    */
  48 /*****************************************************************************/
  49
  50
  51
  52 /* Flags */
  53 #define ED_OK           0x00            /* Nothing special */
  54 #define ED_TOO_COMPLEX  0x01            /* Expression is too complex */
  55 #define ED_ERROR        0x02            /* Error evaluating the expression */
  56
  57 /* Symbol reference */
  58 typedef struct ED_SymRef ED_SymRef;
  59 struct ED_SymRef {
  60     long                Count;          /* Number of references */
  61     struct SymEntry*    Ref;            /* Actual reference */
  62 };
  63
  64 /* Section reference */
  65 typedef struct ED_SecRef ED_SecRef;
  66 struct ED_SecRef {
  67     long                Count;          /* Number of references */
  68     unsigned            Ref;            /* Actual reference */
  69 };
  70
  71 /* Structure for parsing expression trees */
  72 typedef struct ExprDesc ExprDesc;
  73 struct ExprDesc {
  74     unsigned short      Flags;          /* See ED_xxx */
  75     unsigned char       AddrSize;       /* Address size of the expression */
  76     long                Val;            /* The offset value */
  77     long                Right;          /* Right value for StudyBinaryExpr */
  78
  79     /* Symbol reference management */
  80     unsigned            SymCount;       /* Number of symbols referenced */
  81     unsigned            SymLimit;       /* Memory allocated */
  82     ED_SymRef*          SymRef;         /* Symbol references */
  83
  84     /* Section reference management */
  85     unsigned            SecCount;       /* Number of sections referenced */
  86     unsigned            SecLimit;       /* Memory allocated */
  87     ED_SecRef*          SecRef;         /* Section references */
  88 };
  89
  90
  91
  92 /*****************************************************************************/
  93 /*                              struct ExprDesc                              */
  94 /*****************************************************************************/
  95
  96
  97
  98 ExprDesc* ED_Init (ExprDesc* ED);
  99 /* Initialize an ExprDesc structure for use with StudyExpr */
 100
 101 void ED_Done (ExprDesc* ED);
 102 /* Delete allocated memory for an ExprDesc. */
 103
 104 int ED_IsConst (const ExprDesc* ED);
 105 /* Return true if the expression is constant */
 106
 107
 108
 109 /*****************************************************************************/
 110 /*                                   Code                                    */
 111 /*****************************************************************************/
 112
 113
 114
 115 void StudyExpr (ExprNode* Expr, ExprDesc* D);
 116 /* Study an expression tree and place the contents into D */
 117
 118
 119
 120 /* End of studyexpr.h */
 121
 122 #endif