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 */
54static LoopDesc* LoopStack = 0;
55
56
57
58/*****************************************************************************/
59/* Code */
60/*****************************************************************************/
61
62
63
64LoopDesc* 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
85LoopDesc* CurrentLoop (void)
86/* Return a pointer to the descriptor of the current loop */
87{
88 return LoopStack;
89}
90
91
92
93void DelLoop (void)
94/* Remove the current loop */
95{
96 LoopDesc* L = LoopStack;
97 CHECK (L != 0);
98 LoopStack = LoopStack->Next;
99 xfree (L);
100}
101