src/runtime/gc-internal.h

   1 /*
   2  * garbage collection - shared definitions for modules "inside" the GC system
   3  */
   4
   5 /*
   6  * This software is part of the SBCL system. See the README file for
   7  * more information.
   8  *
   9  * This software is derived from the CMU CL system, which was
  10  * written at Carnegie Mellon University and released into the
  11  * public domain. The software is in the public domain and is
  12  * provided with absolutely no warranty. See the COPYING and CREDITS
  13  * files for more information.
  14  */
  15
  16 #ifndef _GC_INTERNAL_H_
  17 #define _GC_INTERNAL_H_
  18
  19 #include <genesis/simple-fun.h>
  20
  21 /* disabling gc assertions made no discernable difference to GC speed,
  22  * last I tried it - dan 2003.12.21
  23  *
  24  * And it's unsafe to do so while things like gc_assert(0 ==
  25  * thread_mutex_lock(&allocation_lock)) exist. - MG 2009-01-13
  26  */
  27 #if 1
  28 # define gc_assert(ex)                                                 \
  29 do {                                                                   \
  30     if (!(ex)) gc_abort();                                             \
  31 } while (0)
  32 # define gc_assert_verbose(ex, fmt, ...)                               \
  33 do {                                                                   \
  34     if (!(ex)) {                                                       \
  35         fprintf(stderr, fmt, ## __VA_ARGS__);                          \
  36         gc_abort();                                                    \
  37     }                                                                  \
  38 } while (0)
  39 #else
  40 # define gc_assert(ex)
  41 # define gc_assert_verbose(ex, fmt, ...)
  42 #endif
  43
  44 #define gc_abort()                                                     \
  45   lose("GC invariant lost, file \"%s\", line %d\n", __FILE__, __LINE__)
  46
  47 #define CEILING(x,y) (((x) + ((y) - 1)) & (~((y) - 1)))
  48
  49 static inline unsigned long
  50 NWORDS(unsigned long x, unsigned long n_bits)
  51 {
  52     /* A good compiler should be able to constant-fold this whole thing,
  53        even with the conditional. */
  54     if(n_bits <= N_WORD_BITS) {
  55         unsigned long elements_per_word = N_WORD_BITS/n_bits;
  56
  57         return CEILING(x, elements_per_word)/elements_per_word;
  58     }
  59     else {
  60         /* FIXME: should have some sort of assertion that N_WORD_BITS
  61            evenly divides n_bits */
  62         return x * (n_bits/N_WORD_BITS);
  63     }
  64 }
  65
  66 /* FIXME: Shouldn't this be defined in sbcl.h? */
  67
  68 #if defined(LISP_FEATURE_SPARC)
  69 #define FUN_RAW_ADDR_OFFSET 0
  70 #else
  71 #define FUN_RAW_ADDR_OFFSET (offsetof(struct simple_fun, code) - FUN_POINTER_LOWTAG)
  72 #endif
  73
  74 /* values for the *_alloc_* parameters */
  75 #define FREE_PAGE_FLAG 0
  76 #define BOXED_PAGE_FLAG 1
  77 #define UNBOXED_PAGE_FLAG 2
  78 #define OPEN_REGION_PAGE_FLAG 4
  79 #define CODE_PAGE_FLAG        (BOXED_PAGE_FLAG|UNBOXED_PAGE_FLAG)
  80
  81 #define ALLOC_BOXED 0
  82 #define ALLOC_UNBOXED 1
  83 #define ALLOC_QUICK 1
  84
  85 #ifdef LISP_FEATURE_GENCGC
  86 #include "gencgc-alloc-region.h"
  87 void *
  88 gc_alloc_with_region(long nbytes,int page_type_flag, struct alloc_region *my_region,
  89                      int quick_p);
  90 static inline void *
  91 gc_general_alloc(long nbytes, int page_type_flag, int quick_p)
  92 {
  93     struct alloc_region *my_region;
  94     if (UNBOXED_PAGE_FLAG == page_type_flag) {
  95         my_region = &unboxed_region;
  96     } else if (BOXED_PAGE_FLAG & page_type_flag) {
  97         my_region = &boxed_region;
  98     } else {
  99         lose("bad page type flag: %d", page_type_flag);
 100     }
 101     return gc_alloc_with_region(nbytes, page_type_flag, my_region, quick_p);
 102 }
 103 #else
 104 extern void *gc_general_alloc(long nbytes,int page_type_flag,int quick_p);
 105 #endif
 106
 107 extern long (*scavtab[256])(lispobj *where, lispobj object);
 108 extern lispobj (*transother[256])(lispobj object);
 109 extern long (*sizetab[256])(lispobj *where);
 110
 111 extern struct weak_pointer *weak_pointers; /* in gc-common.c */
 112 extern struct hash_table *weak_hash_tables; /* in gc-common.c */
 113
 114 extern void scavenge(lispobj *start, long n_words);
 115 extern void scavenge_interrupt_contexts(void);
 116 extern void scav_weak_hash_tables(void);
 117 extern void scan_weak_hash_tables(void);
 118 extern void scan_weak_pointers(void);
 119
 120 lispobj  copy_large_unboxed_object(lispobj object, long nwords);
 121 lispobj  copy_unboxed_object(lispobj object, long nwords);
 122 lispobj  copy_large_object(lispobj object, long nwords);
 123 lispobj  copy_object(lispobj object, long nwords);
 124 lispobj  copy_code_object(lispobj object, long nwords);
 125
 126 lispobj *search_read_only_space(void *pointer);
 127 lispobj *search_static_space(void *pointer);
 128 lispobj *search_dynamic_space(void *pointer);
 129
 130 lispobj *gc_search_space(lispobj *start, size_t words, lispobj *pointer);
 131
 132 #include "fixnump.h"
 133
 134 #ifdef LISP_FEATURE_GENCGC
 135 #include "gencgc-internal.h"
 136 #else
 137 #include "cheneygc-internal.h"
 138 #endif
 139
 140 #if N_WORD_BITS == 32
 141 # define SIMPLE_ARRAY_WORD_WIDETAG SIMPLE_ARRAY_UNSIGNED_BYTE_32_WIDETAG
 142 #elif N_WORD_BITS == 64
 143 # define SIMPLE_ARRAY_WORD_WIDETAG SIMPLE_ARRAY_UNSIGNED_BYTE_64_WIDETAG
 144 #endif
 145
 146 #endif /* _GC_INTERNAL_H_ */