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[cc65] / src / cc65 / loop.c
1 /*****************************************************************************/
2 /*                                                                           */
3 /*                                  loop.c                                   */
4 /*                                                                           */
5 /*                              Loop management                              */
6 /*                                                                           */
7 /*                                                                           */
8 /*                                                                           */
9 /* (C) 1998-2004 Ullrich von Bassewitz                                       */
10 /*               Römerstraße 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 /* common */
37 #include "check.h"
38 #include "xmalloc.h"
39
40 /* cc65 */
41 #include "error.h"
42 #include "loop.h" 
43 #include "stackptr.h"
44
45
46
47 /*****************************************************************************/
48 /*                                   Data                                    */
49 /*****************************************************************************/
50
51
52
53 /* The root */
54 static LoopDesc* LoopStack = 0;
55
56
57
58 /*****************************************************************************/
59 /*                                   Code                                    */
60 /*****************************************************************************/
61
62
63
64 LoopDesc* AddLoop (unsigned BreakLabel, unsigned ContinueLabel)
65 /* Create and add a new loop descriptor. */
66 {
67     /* Allocate a new struct */
68     LoopDesc* L = xmalloc (sizeof (LoopDesc));
69
70     /* Fill in the data */
71     L->StackPtr         = StackPtr;
72     L->BreakLabel       = BreakLabel;
73     L->ContinueLabel    = ContinueLabel;
74
75     /* Insert it into the list */
76     L->Next = LoopStack;
77     LoopStack = L;
78
79     /* Return a pointer to the struct */
80     return L;
81 }
82
83
84
85 LoopDesc* CurrentLoop (void)
86 /* Return a pointer to the descriptor of the current loop */
87 {
88     return LoopStack;
89 }
90
91
92
93 void DelLoop (void)
94 /* Remove the current loop */
95 {
96     LoopDesc* L = LoopStack;
97     CHECK (L != 0);
98     LoopStack = LoopStack->Next;
99     xfree (L);
100 }