1 /*****************************************************************************/
5 /* Study an expression tree */
9 /* (C) 2003-2012, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
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 */
55 #define ED_ERROR 0x02 /* Error evaluating the expression */
57 /* Symbol reference */
58 typedef struct ED_SymRef ED_SymRef;
60 long Count; /* Number of references */
61 struct SymEntry* Ref; /* Actual reference */
64 /* Section reference */
65 typedef struct ED_SecRef ED_SecRef;
67 long Count; /* Number of references */
68 unsigned Ref; /* Actual reference */
71 /* Structure for parsing expression trees */
72 typedef struct ExprDesc 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 */
79 /* Symbol reference management */
80 unsigned SymCount; /* Number of symbols referenced */
81 unsigned SymLimit; /* Memory allocated */
82 ED_SymRef* SymRef; /* Symbol references */
84 /* Section reference management */
85 unsigned SecCount; /* Number of sections referenced */
86 unsigned SecLimit; /* Memory allocated */
87 ED_SecRef* SecRef; /* Section references */
92 /*****************************************************************************/
94 /*****************************************************************************/
98 ExprDesc* ED_Init (ExprDesc* ED);
99 /* Initialize an ExprDesc structure for use with StudyExpr */
101 void ED_Done (ExprDesc* ED);
102 /* Delete allocated memory for an ExprDesc. */
104 int ED_IsConst (const ExprDesc* ED);
105 /* Return true if the expression is constant */
109 /*****************************************************************************/
111 /*****************************************************************************/
115 void StudyExpr (ExprNode* Expr, ExprDesc* D);
116 /* Study an expression tree and place the contents into D */
120 /* End of studyexpr.h */