1 | /*****************************************************************************/ |
2 | /* */ |
3 | /* expr.h */ |
4 | /* */ |
5 | /* Expression evaluation for the ld65 linker */ |
6 | /* */ |
7 | /* */ |
8 | /* */ |
9 | /* (C) 1998-2011, 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 EXPR_H |
37 | #define EXPR_H |
38 | |
39 | |
40 | |
41 | /* common */ |
42 | #include "exprdefs.h" |
43 | |
44 | /* ld65 */ |
45 | #include "objdata.h" |
46 | #include "exports.h" |
47 | #include "config.h" |
48 | |
49 | |
50 | |
51 | /*****************************************************************************/ |
52 | /* Data */ |
53 | /*****************************************************************************/ |
54 | |
55 | |
56 | |
57 | /* Structure for parsing segment based expression trees */ |
58 | typedef struct SegExprDesc SegExprDesc; |
59 | struct SegExprDesc { |
60 | long Val; /* The offset value */ |
61 | int TooComplex; /* Expression too complex */ |
62 | Segment* Seg; /* Segment reference if any */ |
63 | }; |
64 | |
65 | |
66 | |
67 | /*****************************************************************************/ |
68 | /* Code */ |
69 | /*****************************************************************************/ |
70 | |
71 | |
72 | |
73 | ExprNode* NewExprNode (ObjData* O, unsigned char Op); |
74 | /* Create a new expression node */ |
75 | |
76 | void FreeExpr (ExprNode* Root); |
77 | /* Free the expression tree, Root is pointing to. */ |
78 | |
79 | int IsConstExpr (ExprNode* Root); |
80 | /* Return true if the given expression is a constant expression, that is, one |
81 | ** with no references to external symbols. |
82 | */ |
83 | |
84 | Import* GetExprImport (ExprNode* Expr); |
85 | /* Get the import data structure for a symbol expression node */ |
86 | |
87 | Export* GetExprExport (ExprNode* Expr); |
88 | /* Get the exported symbol for a symbol expression node */ |
89 | |
90 | Section* GetExprSection (ExprNode* Expr); |
91 | /* Get the segment for a section expression node */ |
92 | |
93 | long GetExprVal (ExprNode* Expr); |
94 | /* Get the value of a constant expression */ |
95 | |
96 | void GetSegExprVal (ExprNode* Expr, SegExprDesc* D); |
97 | /* Check if the given expression consists of a segment reference and only |
98 | ** constant values, additions and subtractions. If anything else is found, |
99 | ** set D->TooComplex to true. The function will initialize D. |
100 | */ |
101 | |
102 | ExprNode* LiteralExpr (long Val, ObjData* O); |
103 | /* Return an expression tree that encodes the given literal value */ |
104 | |
105 | ExprNode* MemoryExpr (MemoryArea* Mem, long Offs, ObjData* O); |
106 | /* Return an expression tree that encodes an offset into the memory area */ |
107 | |
108 | ExprNode* SegmentExpr (Segment* Seg, long Offs, ObjData* O); |
109 | /* Return an expression tree that encodes an offset into a segment */ |
110 | |
111 | ExprNode* SectionExpr (Section* Sec, long Offs, ObjData* O); |
112 | /* Return an expression tree that encodes an offset into a section */ |
113 | |
114 | ExprNode* ReadExpr (FILE* F, ObjData* O); |
115 | /* Read an expression from the given file */ |
116 | |
117 | int EqualExpr (ExprNode* E1, ExprNode* E2); |
118 | /* Check if two expressions are identical. */ |
119 | |
120 | |
121 | |
122 | /* End of expr.h */ |
123 | |
124 | #endif |
125 | |