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, 2010 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 #include "ggc.h"
  26
  27 /* Call ggc_set_mark on all the roots.  */
  28 extern void ggc_mark_roots (void);
  29
  30 /* Stringpool.  */
  31
  32 /* Mark the entries in the string pool.  */
  33 extern void ggc_mark_stringpool (void);
  34
  35 /* Purge the entries in the string pool.  */
  36 extern void ggc_purge_stringpool (void);
  37
  38 /* Save and restore the string pool entries for PCH.  */
  39
  40 extern void gt_pch_save_stringpool (void);
  41 extern void gt_pch_fixup_stringpool (void);
  42 extern void gt_pch_restore_stringpool (void);
  43
  44 /* PCH and GGC handling for strings, mostly trivial.  */
  45 extern void gt_pch_p_S (void *, void *, gt_pointer_operator, void *);
  46
  47 /* PCH.  */
  48
  49 struct ggc_pch_data;
  50
  51 /* Return a new ggc_pch_data structure.  */
  52 extern struct ggc_pch_data *init_ggc_pch (void);
  53
  54 /* The second parameter and third parameters give the address and size
  55    of an object.  Update the ggc_pch_data structure with as much of
  56    that information as is necessary. The bool argument should be true
  57    if the object is a string.  */
  58 extern void ggc_pch_count_object (struct ggc_pch_data *, void *, size_t, bool,
  59                                   enum gt_types_enum);
  60
  61 /* Return the total size of the data to be written to hold all
  62    the objects previously passed to ggc_pch_count_object.  */
  63 extern size_t ggc_pch_total_size (struct ggc_pch_data *);
  64
  65 /* The objects, when read, will most likely be at the address
  66    in the second parameter.  */
  67 extern void ggc_pch_this_base (struct ggc_pch_data *, void *);
  68
  69 /* Assuming that the objects really do end up at the address
  70    passed to ggc_pch_this_base, return the address of this object.
  71    The bool argument should be true if the object is a string.  */
  72 extern char *ggc_pch_alloc_object (struct ggc_pch_data *, void *, size_t, bool,
  73                                    enum gt_types_enum);
  74
  75 /* Write out any initial information required.  */
  76 extern void ggc_pch_prepare_write (struct ggc_pch_data *, FILE *);
  77
  78 /* Write out this object, including any padding.  The last argument should be
  79    true if the object is a string.  */
  80 extern void ggc_pch_write_object (struct ggc_pch_data *, FILE *, void *,
  81                                   void *, size_t, bool);
  82
  83 /* All objects have been written, write out any final information
  84    required.  */
  85 extern void ggc_pch_finish (struct ggc_pch_data *, FILE *);
  86
  87 /* A PCH file has just been read in at the address specified second
  88    parameter.  Set up the GC implementation for the new objects.  */
  89 extern void ggc_pch_read (FILE *, void *);
  90
  91
  92 /* Allocation and collection.  */
  93
  94 /* When set, ggc_collect will do collection.  */
  95 extern bool ggc_force_collect;
  96
  97 extern void ggc_record_overhead (size_t, size_t, void * MEM_STAT_DECL);
  98
  99 extern void ggc_free_overhead (void *);
 100
 101 extern void ggc_prune_overhead_list (void);
 102
 103 /* Return the number of bytes allocated at the indicated address.  */
 104 extern size_t ggc_get_size (const void *);
 105
 106
 107 /* Statistics.  */
 108
 109 /* This structure contains the statistics common to all collectors.
 110    Particular collectors can extend this structure.  */
 111 typedef struct ggc_statistics
 112 {
 113   /* At present, we don't really gather any interesting statistics.  */
 114   int unused;
 115 } ggc_statistics;
 116
 117 /* Used by the various collectors to gather and print statistics that
 118    do not depend on the collector in use.  */
 119 extern void ggc_print_common_statistics (FILE *, ggc_statistics *);
 120
 121 #endif