gcc/ggc-internal.h

   1 /* Garbage collection for the GNU compiler.  Internal definitions
   2    for ggc-*.c and stringpool.c.
   3
   4    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_GGC_INTERNAL_H
  23 #define GCC_GGC_INTERNAL_H
  24
  25
  26 /* Call ggc_set_mark on all the roots.  */
  27 extern void ggc_mark_roots (void);
  28
  29 /* Stringpool.  */
  30
  31 /* Mark the entries in the string pool.  */
  32 extern void ggc_mark_stringpool (void);
  33
  34 /* Purge the entries in the string pool.  */
  35 extern void ggc_purge_stringpool (void);
  36
  37 /* Save and restore the string pool entries for PCH.  */
  38
  39 extern void gt_pch_save_stringpool (void);
  40 extern void gt_pch_fixup_stringpool (void);
  41 extern void gt_pch_restore_stringpool (void);
  42
  43 /* PCH and GGC handling for strings, mostly trivial.  */
  44 extern void gt_pch_p_S (void *, void *, gt_pointer_operator, void *);
  45
  46 /* PCH.  */
  47
  48 struct ggc_pch_data;
  49
  50 /* Return a new ggc_pch_data structure.  */
  51 extern struct ggc_pch_data *init_ggc_pch (void);
  52
  53 /* The second parameter and third parameters give the address and size
  54    of an object.  Update the ggc_pch_data structure with as much of
  55    that information as is necessary. The bool argument should be true
  56    if the object is a string.  */
  57 extern void ggc_pch_count_object (struct ggc_pch_data *, void *, size_t, bool);
  58
  59 /* Return the total size of the data to be written to hold all
  60    the objects previously passed to ggc_pch_count_object.  */
  61 extern size_t ggc_pch_total_size (struct ggc_pch_data *);
  62
  63 /* The objects, when read, will most likely be at the address
  64    in the second parameter.  */
  65 extern void ggc_pch_this_base (struct ggc_pch_data *, void *);
  66
  67 /* Assuming that the objects really do end up at the address
  68    passed to ggc_pch_this_base, return the address of this object.
  69    The bool argument should be true if the object is a string.  */
  70 extern char *ggc_pch_alloc_object (struct ggc_pch_data *, void *, size_t, bool);
  71
  72 /* Write out any initial information required.  */
  73 extern void ggc_pch_prepare_write (struct ggc_pch_data *, FILE *);
  74
  75 /* Write out this object, including any padding.  The last argument should be
  76    true if the object is a string.  */
  77 extern void ggc_pch_write_object (struct ggc_pch_data *, FILE *, void *,
  78                                   void *, size_t, bool);
  79
  80 /* All objects have been written, write out any final information
  81    required.  */
  82 extern void ggc_pch_finish (struct ggc_pch_data *, FILE *);
  83
  84 /* A PCH file has just been read in at the address specified second
  85    parameter.  Set up the GC implementation for the new objects.  */
  86 extern void ggc_pch_read (FILE *, void *);
  87
  88
  89 /* Allocation and collection.  */
  90
  91 extern void ggc_record_overhead (size_t, size_t, void * FINAL_MEM_STAT_DECL);
  92
  93 extern void ggc_free_overhead (void *);
  94
  95 extern void ggc_prune_overhead_list (void);
  96
  97 /* Return the number of bytes allocated at the indicated address.  */
  98 extern size_t ggc_get_size (const void *);
  99
 100
 101 /* Statistics.  */
 102
 103 /* This structure contains the statistics common to all collectors.
 104    Particular collectors can extend this structure.  */
 105 struct ggc_statistics
 106 {
 107   /* At present, we don't really gather any interesting statistics.  */
 108   int unused;
 109 };
 110
 111 /* Used by the various collectors to gather and print statistics that
 112    do not depend on the collector in use.  */
 113 extern void ggc_print_common_statistics (FILE *, ggc_statistics *);
 114
 115 #endif