/* * private-gc.h - private declarations for garbage collection. * * Copyright (C) 2002, 03, 04, 05, 06, 07, 08, 09 Free Software Foundation, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 3 of * the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA */ #ifndef SCM_PRIVATE_GC #define SCM_PRIVATE_GC #include "_scm.h" /* {heap tuning parameters} * * These are parameters for controlling memory allocation. The heap * is the area out of which scm_cons, and object headers are allocated. * * Each heap cell is 8 bytes on a 32 bit machine and 16 bytes on a * 64 bit machine. The units of the _SIZE parameters are bytes. * Cons pairs and object headers occupy one heap cell. */ #define SCM_DEFAULT_INIT_HEAP_SIZE_2 32*1024 #define SCM_DOUBLECELL_ALIGNED_P(x) (((2 * sizeof (scm_t_cell) - 1) & SCM_UNPACK (x)) == 0) SCM_INTERNAL int scm_getenv_int (const char *var, int def); typedef enum { return_on_error, abort_on_error } policy_on_error; #define SCM_MAX(A, B) ((A) > (B) ? (A) : (B)) #define SCM_MIN(A, B) ((A) < (B) ? (A) : (B)) /* CELL_P checks a random word whether it has the right form for a pointer to a cell. Use scm_i_find_heap_segment_containing_object to find out whether it actually points to a real cell. The right form for a cell pointer is this: the low three bits must be scm_tc3_cons, and when the scm_tc3_cons tag is stripped, the resulting pointer must be correctly aligned. scm_i_initialize_heap_segment_data guarantees that the test below works. */ #define CELL_P(x) ((SCM_UNPACK(x) & (sizeof(scm_t_cell)-1)) == scm_tc3_cons) SCM_INTERNAL char const *scm_i_tag_name (scm_t_bits tag); /* MOVEME */ #endif