Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 2 | Copyright (c) 2000, BeOpen.com. |
| 3 | Copyright (c) 1995-2000, Corporation for National Research Initiatives. |
| 4 | Copyright (c) 1990-1995, Stichting Mathematisch Centrum. |
| 5 | All rights reserved. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 6 | |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 7 | See the file "Misc/COPYRIGHT" for information on usage and |
| 8 | redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 9 | ******************************************************************/ |
| 10 | |
Jeremy Hylton | 9498806 | 2000-06-20 19:10:44 +0000 | [diff] [blame] | 11 | #include <limits.h> |
| 12 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 13 | /* Parse tree node implementation */ |
| 14 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 15 | #include "pgenheaders.h" |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 16 | #include "node.h" |
Jeremy Hylton | 9498806 | 2000-06-20 19:10:44 +0000 | [diff] [blame] | 17 | #include "errcode.h" |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 18 | |
| 19 | node * |
Thomas Wouters | 23c9e00 | 2000-07-22 19:20:54 +0000 | [diff] [blame] | 20 | PyNode_New(int type) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 21 | { |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 22 | node *n = PyMem_NEW(node, 1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 23 | if (n == NULL) |
| 24 | return NULL; |
| 25 | n->n_type = type; |
| 26 | n->n_str = NULL; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 27 | n->n_lineno = 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 28 | n->n_nchildren = 0; |
| 29 | n->n_child = NULL; |
| 30 | return n; |
| 31 | } |
| 32 | |
| 33 | #define XXX 3 /* Node alignment factor to speed up realloc */ |
| 34 | #define XXXROUNDUP(n) ((n) == 1 ? 1 : ((n) + XXX - 1) / XXX * XXX) |
| 35 | |
Jeremy Hylton | 9498806 | 2000-06-20 19:10:44 +0000 | [diff] [blame] | 36 | int |
Thomas Wouters | 23c9e00 | 2000-07-22 19:20:54 +0000 | [diff] [blame] | 37 | PyNode_AddChild(register node *n1, int type, char *str, int lineno) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 38 | { |
| 39 | register int nch = n1->n_nchildren; |
| 40 | register int nch1 = nch+1; |
| 41 | register node *n; |
Jeremy Hylton | 9498806 | 2000-06-20 19:10:44 +0000 | [diff] [blame] | 42 | if (nch == SHRT_MAX || nch < 0) |
| 43 | return E_OVERFLOW; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 44 | if (XXXROUNDUP(nch) < nch1) { |
| 45 | n = n1->n_child; |
| 46 | nch1 = XXXROUNDUP(nch1); |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 47 | PyMem_RESIZE(n, node, nch1); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 48 | if (n == NULL) |
Jeremy Hylton | 9498806 | 2000-06-20 19:10:44 +0000 | [diff] [blame] | 49 | return E_NOMEM; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 50 | n1->n_child = n; |
| 51 | } |
| 52 | n = &n1->n_child[n1->n_nchildren++]; |
| 53 | n->n_type = type; |
| 54 | n->n_str = str; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 55 | n->n_lineno = lineno; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 56 | n->n_nchildren = 0; |
| 57 | n->n_child = NULL; |
Jeremy Hylton | 9498806 | 2000-06-20 19:10:44 +0000 | [diff] [blame] | 58 | return 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 59 | } |
Guido van Rossum | 03a24cd | 1990-11-18 17:37:06 +0000 | [diff] [blame] | 60 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 61 | /* Forward */ |
Tim Peters | dbd9ba6 | 2000-07-09 03:09:57 +0000 | [diff] [blame] | 62 | static void freechildren(node *); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 63 | |
| 64 | |
| 65 | void |
Thomas Wouters | 23c9e00 | 2000-07-22 19:20:54 +0000 | [diff] [blame] | 66 | PyNode_Free(node *n) |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 67 | { |
| 68 | if (n != NULL) { |
| 69 | freechildren(n); |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 70 | PyMem_DEL(n); |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 71 | } |
| 72 | } |
| 73 | |
Guido van Rossum | 03a24cd | 1990-11-18 17:37:06 +0000 | [diff] [blame] | 74 | static void |
Thomas Wouters | 23c9e00 | 2000-07-22 19:20:54 +0000 | [diff] [blame] | 75 | freechildren(node *n) |
Guido van Rossum | 03a24cd | 1990-11-18 17:37:06 +0000 | [diff] [blame] | 76 | { |
| 77 | int i; |
| 78 | for (i = NCH(n); --i >= 0; ) |
| 79 | freechildren(CHILD(n, i)); |
| 80 | if (n->n_child != NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 81 | PyMem_DEL(n->n_child); |
Guido van Rossum | 03a24cd | 1990-11-18 17:37:06 +0000 | [diff] [blame] | 82 | if (STR(n) != NULL) |
Guido van Rossum | 86bea46 | 1997-04-29 21:03:06 +0000 | [diff] [blame] | 83 | PyMem_DEL(STR(n)); |
Guido van Rossum | 03a24cd | 1990-11-18 17:37:06 +0000 | [diff] [blame] | 84 | } |