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 #if 1
  24 # define gc_assert(ex)                                                 \
  25 do {                                                                   \
  26     if (!(ex)) gc_abort();                                             \
  27 } while (0)
  28 # define gc_assert_verbose(ex, fmt, ...)                               \
  29 do {                                                                   \
  30     if (!(ex)) {                                                       \
  31         fprintf(stderr, fmt, ## __VA_ARGS__);                          \
  32         gc_abort();                                                    \
  33     }                                                                  \
  34 } while (0)
  35 #else
  36 # define gc_assert(ex)
  37 # define gc_assert_verbose(ex, fmt, ...)
  38 #endif
  39
  40 #define gc_abort()                                                     \
  41   lose("GC invariant lost, file \"%s\", line %d\n", __FILE__, __LINE__)
  42
  43 #define CEILING(x,y) (((x) + ((y) - 1)) & (~((y) - 1)))
  44
  45 static inline unsigned long
  46 NWORDS(unsigned long x, unsigned long n_bits)
  47 {
  48     /* A good compiler should be able to constant-fold this whole thing,
  49        even with the conditional. */
  50     if(n_bits <= N_WORD_BITS) {
  51         unsigned long elements_per_word = N_WORD_BITS/n_bits;
  52
  53         return CEILING(x, elements_per_word)/elements_per_word;
  54     }
  55     else {
  56         /* FIXME: should have some sort of assertion that N_WORD_BITS
  57            evenly divides n_bits */
  58         return x * (n_bits/N_WORD_BITS);
  59     }
  60 }
  61
  62 /* FIXME: Shouldn't this be defined in sbcl.h? */
  63
  64 #if defined(LISP_FEATURE_SPARC)
  65 #define FUN_RAW_ADDR_OFFSET 0
  66 #else
  67 #define FUN_RAW_ADDR_OFFSET (offsetof(struct simple_fun, code) - FUN_POINTER_LOWTAG)
  68 #endif
  69
  70 /* values for the *_alloc_* parameters */
  71 #define FREE_PAGE_FLAG 0
  72 #define BOXED_PAGE_FLAG 1
  73 #define UNBOXED_PAGE_FLAG 2
  74 #define OPEN_REGION_PAGE_FLAG 4
  75 #define CODE_PAGE_FLAG        (BOXED_PAGE_FLAG|UNBOXED_PAGE_FLAG)
  76
  77 #define ALLOC_BOXED 0
  78 #define ALLOC_UNBOXED 1
  79 #define ALLOC_QUICK 1
  80
  81 #ifdef LISP_FEATURE_GENCGC
  82 #include "gencgc-alloc-region.h"
  83 void *
  84 gc_alloc_with_region(long nbytes,int page_type_flag, struct alloc_region *my_region,
  85                      int quick_p);
  86 static inline void *
  87 gc_general_alloc(long nbytes, int page_type_flag, int quick_p)
  88 {
  89     struct alloc_region *my_region;
  90     if (UNBOXED_PAGE_FLAG == page_type_flag) {
  91         my_region = &unboxed_region;
  92     } else if (BOXED_PAGE_FLAG & page_type_flag) {
  93         my_region = &boxed_region;
  94     } else {
  95         lose("bad page type flag: %d", page_type_flag);
  96     }
  97     return gc_alloc_with_region(nbytes, page_type_flag, my_region, quick_p);
  98 }
  99 #else
 100 void *gc_general_alloc(long nbytes,int page_type_flag,int quick_p);
 101 #endif
 102
 103 extern long (*scavtab[256])(lispobj *where, lispobj object);
 104 extern lispobj (*transother[256])(lispobj object);
 105 extern long (*sizetab[256])(lispobj *where);
 106
 107 extern struct weak_pointer *weak_pointers; /* in gc-common.c */
 108 extern struct hash_table *weak_hash_tables; /* in gc-common.c */
 109
 110 extern void scavenge(lispobj *start, long n_words);
 111 extern void scavenge_interrupt_contexts(void);
 112 extern void scav_weak_hash_tables(void);
 113 extern void scan_weak_hash_tables(void);
 114 extern void scan_weak_pointers(void);
 115
 116 lispobj  copy_large_unboxed_object(lispobj object, long nwords);
 117 lispobj  copy_unboxed_object(lispobj object, long nwords);
 118 lispobj  copy_large_object(lispobj object, long nwords);
 119 lispobj  copy_object(lispobj object, long nwords);
 120 lispobj  copy_code_object(lispobj object, long nwords);
 121
 122 lispobj *search_read_only_space(void *pointer);
 123 lispobj *search_static_space(void *pointer);
 124 lispobj *search_dynamic_space(void *pointer);
 125
 126 lispobj *gc_search_space(lispobj *start, size_t words, lispobj *pointer);
 127
 128 #include "fixnump.h"
 129
 130 #ifdef LISP_FEATURE_GENCGC
 131 #include "gencgc-internal.h"
 132 #else
 133 #include "cheneygc-internal.h"
 134 #endif
 135
 136 #if N_WORD_BITS == 32
 137 # define SIMPLE_ARRAY_WORD_WIDETAG SIMPLE_ARRAY_UNSIGNED_BYTE_32_WIDETAG
 138 #elif N_WORD_BITS == 64
 139 # define SIMPLE_ARRAY_WORD_WIDETAG SIMPLE_ARRAY_UNSIGNED_BYTE_64_WIDETAG
 140 #endif
 141
 142 #endif /* _GC_INTERNAL_H_ */