| 1 | /* |
| 2 | * private-gc.h - private declarations for garbage collection. |
| 3 | * |
| 4 | * Copyright (C) 2002, 03, 04, 05, 06, 07, 08, 09 Free Software Foundation, Inc. |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public License |
| 8 | * as published by the Free Software Foundation; either version 3 of |
| 9 | * the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 19 | * 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #ifndef SCM_PRIVATE_GC |
| 23 | #define SCM_PRIVATE_GC |
| 24 | |
| 25 | #include "_scm.h" |
| 26 | |
| 27 | /* {heap tuning parameters} |
| 28 | * |
| 29 | * These are parameters for controlling memory allocation. The heap |
| 30 | * is the area out of which scm_cons, and object headers are allocated. |
| 31 | * |
| 32 | * Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a |
| 33 | * 64 bit machine. The units of the _SIZE parameters are bytes. |
| 34 | * Cons pairs and object headers occupy one heap cell. |
| 35 | */ |
| 36 | |
| 37 | |
| 38 | #define SCM_DEFAULT_INIT_HEAP_SIZE_2 32*1024 |
| 39 | |
| 40 | #define SCM_DOUBLECELL_ALIGNED_P(x) (((2 * sizeof (scm_t_cell) - 1) & SCM_UNPACK (x)) == 0) |
| 41 | |
| 42 | |
| 43 | SCM_INTERNAL int scm_getenv_int (const char *var, int def); |
| 44 | |
| 45 | |
| 46 | typedef enum { return_on_error, abort_on_error } policy_on_error; |
| 47 | |
| 48 | |
| 49 | #define SCM_MAX(A, B) ((A) > (B) ? (A) : (B)) |
| 50 | #define SCM_MIN(A, B) ((A) < (B) ? (A) : (B)) |
| 51 | |
| 52 | /* CELL_P checks a random word whether it has the right form for a |
| 53 | pointer to a cell. Use scm_i_find_heap_segment_containing_object |
| 54 | to find out whether it actually points to a real cell. |
| 55 | |
| 56 | The right form for a cell pointer is this: the low three bits must |
| 57 | be scm_tc3_cons, and when the scm_tc3_cons tag is stripped, the |
| 58 | resulting pointer must be correctly aligned. |
| 59 | scm_i_initialize_heap_segment_data guarantees that the test below |
| 60 | works. |
| 61 | */ |
| 62 | #define CELL_P(x) ((SCM_UNPACK(x) & (sizeof(scm_t_cell)-1)) == scm_tc3_cons) |
| 63 | |
| 64 | SCM_INTERNAL char const *scm_i_tag_name (scm_t_bits tag); /* MOVEME */ |
| 65 | |
| 66 | #endif |