1 /*****************************************************************************/
5 /* Study an expression tree */
9 /* (C) 2003 Ullrich von Bassewitz */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
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. */
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: */
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 */
32 /*****************************************************************************/
46 /*****************************************************************************/
48 /*****************************************************************************/
53 #define ED_OK 0x00 /* Nothing special */
54 #define ED_TOO_COMPLEX 0x01 /* Expression is too complex */
56 /* Symbol reference */
57 typedef struct ED_SymRef ED_SymRef;
59 long Count; /* Number of references */
60 struct SymEntry* Ref; /* Actual reference */
63 /* Section reference */
64 typedef struct ED_SecRef ED_SecRef;
66 long Count; /* Number of references */
67 unsigned Ref; /* Actual reference */
70 /* Structure for parsing expression trees */
71 typedef struct ExprDesc ExprDesc;
73 unsigned short Flags; /* See ED_xxx */
74 unsigned char AddrSize; /* Address size of the expression */
75 long Val; /* The offset value */
76 long Right; /* Right value for StudyBinaryExpr */
78 /* Symbol reference management */
79 unsigned SymCount; /* Number of symbols referenced */
80 unsigned SymLimit; /* Memory allocated */
81 ED_SymRef* SymRef; /* Symbol references */
83 /* Section reference management */
84 unsigned SecCount; /* Number of sections referenced */
85 unsigned SecLimit; /* Memory allocated */
86 ED_SecRef* SecRef; /* Section references */
91 /*****************************************************************************/
93 /*****************************************************************************/
97 ExprDesc* ED_Init (ExprDesc* ED);
98 /* Initialize an ExprDesc structure for use with StudyExpr */
100 void ED_Done (ExprDesc* ED);
101 /* Delete allocated memory for an ExprDesc. */
103 int ED_IsConst (const ExprDesc* ED);
104 /* Return true if the expression is constant */
108 /*****************************************************************************/
110 /*****************************************************************************/
114 void StudyExpr (ExprNode* Expr, ExprDesc* D);
115 /* Study an expression tree and place the contents into D */
119 /* End of studyexpr.h */