1 | /*****************************************************************************/ |
2 | /* */ |
3 | /* ulabel.h */ |
4 | /* */ |
5 | /* Unnamed labels for the ca65 macroassembler */ |
6 | /* */ |
7 | /* */ |
8 | /* */ |
9 | /* (C) 2000-2011, 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 ULABEL_H |
37 | #define ULABEL_H |
38 | |
39 | |
40 | |
41 | /*****************************************************************************/ |
42 | /* Code */ |
43 | /*****************************************************************************/ |
44 | |
45 | |
46 | |
47 | ExprNode* ULabRef (int Which); |
48 | /* Get an unnamed label. If Which is negative, it is a backreference (a |
49 | ** reference to an already defined label), and the function will return a |
50 | ** segment relative expression. If Which is positive, it is a forward ref, |
51 | ** and the function will return a expression node for an unnamed label that |
52 | ** must be resolved later. |
53 | */ |
54 | |
55 | void ULabDef (void); |
56 | /* Define an unnamed label at the current PC */ |
57 | |
58 | int ULabCanResolve (void); |
59 | /* Return true if we can resolve arbitrary ULabels. */ |
60 | |
61 | ExprNode* ULabResolve (unsigned Index); |
62 | /* Return a valid expression for the unnamed label with the given index. This |
63 | ** is used to resolve unnamed labels when assembly is done, so it is an error |
64 | ** if a label is still undefined in this phase. |
65 | */ |
66 | |
67 | void ULabDone (void); |
68 | /* Run through all unnamed labels, check for anomalies and errors and do |
69 | ** necessary cleanups. |
70 | */ |
71 | |
72 | |
73 | |
74 | /* End of ulabel.h */ |
75 | |
76 | #endif |
77 | |