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 |
123 | |