LCOV - code coverage report
Current view: top level - gcc - ggc.h (source / functions) Coverage Total Hit
Test: gcc.info Lines: 97.4 % 38 37
Test Date: 2025-05-10 15:51:31 Functions: 46.7 % 869 406
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: - 0 0

             Branch data     Line data    Source code
       1                 :             : /* Garbage collection for the GNU compiler.
       2                 :             : 
       3                 :             :    Copyright (C) 1998-2025 Free Software Foundation, Inc.
       4                 :             : 
       5                 :             : This file is part of GCC.
       6                 :             : 
       7                 :             : GCC is free software; you can redistribute it and/or modify it under
       8                 :             : the terms of the GNU General Public License as published by the Free
       9                 :             : Software Foundation; either version 3, or (at your option) any later
      10                 :             : version.
      11                 :             : 
      12                 :             : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      13                 :             : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      14                 :             : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      15                 :             : for more details.
      16                 :             : 
      17                 :             : You should have received a copy of the GNU General Public License
      18                 :             : along with GCC; see the file COPYING3.  If not see
      19                 :             : <http://www.gnu.org/licenses/>.  */
      20                 :             : 
      21                 :             : #ifndef GCC_GGC_H
      22                 :             : #define GCC_GGC_H
      23                 :             : 
      24                 :             : /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
      25                 :             :    an external gc library that might be linked in.  */
      26                 :             : 
      27                 :             : /* Internal functions and data structures used by the GTY
      28                 :             :    machinery, including the generated gt*.[hc] files.  */
      29                 :             : 
      30                 :             : #include "gtype-desc.h"
      31                 :             : 
      32                 :             : /* One of these applies its third parameter (with cookie in the fourth
      33                 :             :    parameter) to each pointer in the object pointed to by the first
      34                 :             :    parameter, using the second parameter.  */
      35                 :             : typedef void (*gt_note_pointers) (void *, void *, gt_pointer_operator,
      36                 :             :                                   void *);
      37                 :             : 
      38                 :             : /* One of these is called before objects are re-ordered in memory.
      39                 :             :    The first parameter is the original object, the second is the
      40                 :             :    subobject that has had its pointers reordered, the third parameter
      41                 :             :    can compute the new values of a pointer when given the cookie in
      42                 :             :    the fourth parameter.  */
      43                 :             : typedef void (*gt_handle_reorder) (void *, void *, gt_pointer_operator,
      44                 :             :                                    void *);
      45                 :             : 
      46                 :             : /* Used by the gt_pch_n_* routines.  Register an object in the hash table.  */
      47                 :             : extern int gt_pch_note_object (void *, void *, gt_note_pointers,
      48                 :             :                                size_t length_override = (size_t)-1);
      49                 :             : 
      50                 :             : /* Used by the gt_pch_p_* routines.  Register address of a callback
      51                 :             :    pointer.  */
      52                 :             : extern void gt_pch_note_callback (void *, void *);
      53                 :             : 
      54                 :             : /* Used by the gt_pch_n_* routines.  Register that an object has a reorder
      55                 :             :    function.  */
      56                 :             : extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder);
      57                 :             : 
      58                 :             : /* generated function to clear caches in gc memory.  */
      59                 :             : extern void gt_clear_caches ();
      60                 :             : 
      61                 :             : /* Mark the object in the first parameter and anything it points to.  */
      62                 :             : typedef void (*gt_pointer_walker) (void *);
      63                 :             : 
      64                 :             : /* Structures for the easy way to mark roots.
      65                 :             :    In an array, terminated by having base == NULL.  */
      66                 :             : struct ggc_root_tab {
      67                 :             :   void *base;
      68                 :             :   size_t nelt;
      69                 :             :   size_t stride;
      70                 :             :   gt_pointer_walker cb;
      71                 :             :   gt_pointer_walker pchw;
      72                 :             : };
      73                 :             : #define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
      74                 :             : /* Pointers to arrays of ggc_root_tab, terminated by NULL.  */
      75                 :             : extern const struct ggc_root_tab * const gt_ggc_rtab[];
      76                 :             : extern const struct ggc_root_tab * const gt_ggc_deletable_rtab[];
      77                 :             : extern const struct ggc_root_tab * const gt_pch_scalar_rtab[];
      78                 :             : 
      79                 :             : /* If EXPR is not NULL and previously unmarked, mark it and evaluate
      80                 :             :    to true.  Otherwise evaluate to false.  */
      81                 :             : #define ggc_test_and_set_mark(EXPR) \
      82                 :             :   ((EXPR) != NULL && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
      83                 :             : 
      84                 :             : #define ggc_mark(EXPR)                          \
      85                 :             :   do {                                          \
      86                 :             :     const void *const a__ = (EXPR);             \
      87                 :             :     if (a__ != NULL && a__ != (void *) 1)       \
      88                 :             :       ggc_set_mark (a__);                       \
      89                 :             :   } while (0)
      90                 :             : 
      91                 :             : /* Actually set the mark on a particular region of memory, but don't
      92                 :             :    follow pointers.  This function is called by ggc_mark_*.  It
      93                 :             :    returns false if the object was not previously marked; true if
      94                 :             :    the object was already marked, or if, for any other reason,
      95                 :             :    pointers in this data structure should not be traversed.  */
      96                 :             : extern bool ggc_set_mark (const void *);
      97                 :             : 
      98                 :             : /* Return true if P has been marked, zero otherwise.
      99                 :             :    P must have been allocated by the GC allocator; it mustn't point to
     100                 :             :    static objects, stack variables, or memory allocated with malloc.  */
     101                 :             : extern bool ggc_marked_p (const void *);
     102                 :             : 
     103                 :             : /* PCH and GGC handling for strings, mostly trivial.  */
     104                 :             : extern void gt_pch_n_S (const void *);
     105                 :             : extern void gt_pch_n_S2 (const void *, size_t);
     106                 :             : extern void gt_ggc_m_S (const void *);
     107                 :             : 
     108                 :             : /* End of GTY machinery API.  */
     109                 :             : 
     110                 :             : /* Initialize the string pool.  */
     111                 :             : extern void init_stringpool (void);
     112                 :             : 
     113                 :             : /* Initialize the garbage collector.  */
     114                 :             : extern void init_ggc (void);
     115                 :             : 
     116                 :             : /* When true, identifier nodes are considered as GC roots.  When
     117                 :             :    false, identifier nodes are treated like any other GC-allocated
     118                 :             :    object, and the identifier hash table is treated as a weak
     119                 :             :    hash.  */
     120                 :             : extern bool ggc_protect_identifiers;
     121                 :             : 
     122                 :             : /* Write out all GCed objects to F.  */
     123                 :             : extern void gt_pch_save (FILE *f);
     124                 :             : 
     125                 :             : 
     126                 :             : /* Allocation.  */
     127                 :             : 
     128                 :             : /* The internal primitive.  */
     129                 :             : extern void *ggc_internal_alloc (size_t, void (*)(void *), size_t,
     130                 :             :                                  size_t CXX_MEM_STAT_INFO);
     131                 :             : /* If the second argument is non-NULL, it can't be marked ATTRIBUTE_MALLOC,
     132                 :             :    because ggc_free performs finalization.  Add an alias or wrapper used just
     133                 :             :    for the NULL finalizer which can be marked with ATTRIBUTE_MALLOC.  */
     134                 :             : extern void *ggc_internal_alloc_no_dtor (size_t, void (*)(void *), size_t,
     135                 :             :                                          size_t CXX_MEM_STAT_INFO)
     136                 :             :      ATTRIBUTE_MALLOC;
     137                 :             : 
     138                 :             : inline void *
     139                 : 20027874428 : ggc_internal_alloc (size_t s CXX_MEM_STAT_INFO)
     140                 :             : {
     141                 :  5853390346 :   return ggc_internal_alloc_no_dtor (s, NULL, 0, 1 PASS_MEM_STAT);
     142                 :             : }
     143                 :             : 
     144                 :             : extern size_t ggc_round_alloc_size (size_t requested_size);
     145                 :             : 
     146                 :             : /* Allocates cleared memory.  */
     147                 :             : extern void *ggc_internal_cleared_alloc (size_t, void (*)(void *),
     148                 :             :                                          size_t, size_t
     149                 :             :                                          CXX_MEM_STAT_INFO);
     150                 :             : extern void *ggc_internal_cleared_alloc_no_dtor (size_t, void (*)(void *),
     151                 :             :                                                  size_t, size_t
     152                 :             :                                                  CXX_MEM_STAT_INFO)
     153                 :             :      ATTRIBUTE_MALLOC;
     154                 :             : 
     155                 :             : inline void *
     156                 : 16500052934 : ggc_internal_cleared_alloc (size_t s CXX_MEM_STAT_INFO)
     157                 :             : {
     158                 : 16500052934 :   return ggc_internal_cleared_alloc_no_dtor (s, NULL, 0, 1 PASS_MEM_STAT);
     159                 :             : }
     160                 :             : 
     161                 :             : /* Resize a block.  */
     162                 :             : extern void *ggc_realloc (void *, size_t CXX_MEM_STAT_INFO);
     163                 :             : 
     164                 :             : /* Free a block.  To be used when known for certain it's not reachable.  */
     165                 :             : extern void ggc_free (void *);
     166                 :             : 
     167                 :             : extern void dump_ggc_loc_statistics ();
     168                 :             : 
     169                 :             : /* Reallocator.  */
     170                 :             : #define GGC_RESIZEVEC(T, P, N) \
     171                 :             :     ((T *) ggc_realloc ((P), (N) * sizeof (T) MEM_STAT_INFO))
     172                 :             : 
     173                 :             : template<typename T>
     174                 :             : void
     175                 :    23161956 : finalize (void *p)
     176                 :             : {
     177                 :    23161956 :   static_cast<T *> (p)->~T ();
     178                 :    23161956 : }
     179                 :             : 
     180                 :             : template<typename T>
     181                 :             : inline bool
     182                 :     4317097 : need_finalization_p ()
     183                 :             : {
     184                 :             : #if GCC_VERSION >= 4003
     185                 :             :   return !__has_trivial_destructor (T);
     186                 :             : #else
     187                 :             :   return true;
     188                 :             : #endif
     189                 :             : }
     190                 :             : 
     191                 :             : template<typename T>
     192                 :             : inline T *
     193                 :  3489946129 : ggc_alloc (ALONE_CXX_MEM_STAT_INFO)
     194                 :             : {
     195                 :             :   if (need_finalization_p<T> ())
     196                 :    63979836 :     return static_cast<T *> (ggc_internal_alloc (sizeof (T), finalize<T>, 0, 1
     197                 :             :                                                  PASS_MEM_STAT));
     198                 :             :   else
     199                 :  3425966293 :     return static_cast<T *> (ggc_internal_alloc_no_dtor (sizeof (T), NULL,
     200                 :             :                                                          0, 1 PASS_MEM_STAT));
     201                 :             : }
     202                 :             : 
     203                 :             : /* GGC allocation function that does not call finalizer for type
     204                 :             :    that have need_finalization_p equal to true.  User is responsible
     205                 :             :    for calling of the destructor.  */
     206                 :             : 
     207                 :             : template<typename T>
     208                 :             : inline T *
     209                 :    17320019 : ggc_alloc_no_dtor (ALONE_CXX_MEM_STAT_INFO)
     210                 :             : {
     211                 :    17320019 :   return static_cast<T *> (ggc_internal_alloc_no_dtor (sizeof (T), NULL, 0, 1
     212                 :    17320019 :                                                        PASS_MEM_STAT));
     213                 :             : }
     214                 :             : 
     215                 :             : template<typename T>
     216                 :             : inline T *
     217                 :  2419203206 : ggc_cleared_alloc (ALONE_CXX_MEM_STAT_INFO)
     218                 :             : {
     219                 :             :   if (need_finalization_p<T> ())
     220                 :      549024 :     return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T),
     221                 :             :                                                          finalize<T>, 0, 1
     222                 :             :                                                          PASS_MEM_STAT));
     223                 :             :   else
     224                 :  2418654182 :     return static_cast<T *> (ggc_internal_cleared_alloc_no_dtor (sizeof (T),
     225                 :             :                                                                  NULL, 0, 1
     226                 :             :                                                                  PASS_MEM_STAT));
     227                 :             : }
     228                 :             : 
     229                 :             : template<typename T>
     230                 :             : inline T *
     231                 :     4746937 : ggc_vec_alloc (size_t c CXX_MEM_STAT_INFO)
     232                 :             : {
     233                 :             :   if (need_finalization_p<T> ())
     234                 :             :     return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), finalize<T>,
     235                 :             :                                                  sizeof (T), c PASS_MEM_STAT));
     236                 :             :   else
     237                 :     4746937 :     return static_cast<T *> (ggc_internal_alloc_no_dtor (c * sizeof (T),
     238                 :             :                                                          NULL, 0, 0
     239                 :             :                                                          PASS_MEM_STAT));
     240                 :             : }
     241                 :             : 
     242                 :             : template<typename T>
     243                 :             : inline T *
     244                 :    93905744 : ggc_cleared_vec_alloc (size_t c CXX_MEM_STAT_INFO)
     245                 :             : {
     246                 :             :   if (need_finalization_p<T> ())
     247                 :           0 :     return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T),
     248                 :             :                                                          finalize<T>,
     249                 :             :                                                          sizeof (T), c
     250                 :             :                                                          PASS_MEM_STAT));
     251                 :             :   else
     252                 :    93905744 :     return static_cast<T *> (ggc_internal_cleared_alloc_no_dtor (c
     253                 :             :                                                                  * sizeof (T),
     254                 :             :                                                                  NULL, 0, 0
     255                 :             :                                                                  PASS_MEM_STAT));
     256                 :             : }
     257                 :             : 
     258                 :             : inline void *
     259                 :  2137112899 : ggc_alloc_atomic (size_t s CXX_MEM_STAT_INFO)
     260                 :             : {
     261                 :  2137112899 :     return ggc_internal_alloc (s PASS_MEM_STAT);
     262                 :             : }
     263                 :             : 
     264                 :             : /* Call destructor and free the garbage collected memory.  */
     265                 :             : 
     266                 :             : template <typename T>
     267                 :             : inline void
     268                 :    39169728 : ggc_delete (T *ptr)
     269                 :             : {
     270                 :    36334685 :   ptr->~T ();
     271                 :    48139246 :   ggc_free (ptr);
     272                 :    47566320 : }
     273                 :             : 
     274                 :             : /* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
     275                 :             :    If LENGTH is -1, then CONTENTS is assumed to be a
     276                 :             :    null-terminated string and the memory sized accordingly.  */
     277                 :             : extern const char *ggc_alloc_string (const char *contents, int length
     278                 :             :                                      CXX_MEM_STAT_INFO);
     279                 :             : 
     280                 :             : /* Make a copy of S, in GC-able memory.  */
     281                 :             : #define ggc_strdup(S) ggc_alloc_string ((S), -1 MEM_STAT_INFO)
     282                 :             : 
     283                 :             : /* Invoke the collector.  Garbage collection occurs only when this
     284                 :             :    function is called, not during allocations.  */
     285                 :             : enum ggc_collect {
     286                 :             :   GGC_COLLECT_HEURISTIC,
     287                 :             :   GGC_COLLECT_FORCE
     288                 :             : };
     289                 :             : extern void ggc_collect (enum ggc_collect mode = GGC_COLLECT_HEURISTIC);
     290                 :             : 
     291                 :             : /* Return unused memory pages to the system.  */
     292                 :             : extern void ggc_trim (void);
     293                 :             : 
     294                 :             : /* Assume that all GGC memory is reachable and grow the limits for next collection. */
     295                 :             : extern void ggc_grow (void);
     296                 :             : 
     297                 :             : /* Register an additional root table.  This can be useful for some
     298                 :             :    plugins.  Does nothing if the passed pointer is NULL. */
     299                 :             : extern void ggc_register_root_tab (const struct ggc_root_tab *);
     300                 :             : 
     301                 :             : /* Read objects previously saved with gt_pch_save from F.  */
     302                 :             : extern void gt_pch_restore (FILE *f);
     303                 :             : 
     304                 :             : /* Statistics.  */
     305                 :             : 
     306                 :             : /* Print allocation statistics.  */
     307                 :             : extern void ggc_print_statistics (void);
     308                 :             : 
     309                 :             : extern void stringpool_statistics (void);
     310                 :             : 
     311                 :             : /* Heuristics.  */
     312                 :             : extern void init_ggc_heuristics (void);
     313                 :             : 
     314                 :             : /* Report current heap memory use to stderr.  */
     315                 :             : extern void report_heap_memory_use (void);
     316                 :             : 
     317                 :             : #define ggc_alloc_rtvec_sized(NELT)                             \
     318                 :             :   (rtvec_def *) ggc_internal_alloc (sizeof (struct rtvec_def)           \
     319                 :             :                        + ((NELT) - 1) * sizeof (rtx))           \
     320                 :             : 
     321                 :             : /* Memory statistics passing versions of some allocators.  Too few of them to
     322                 :             :    make gengtype produce them, so just define the needed ones here.  */
     323                 :             : inline struct rtx_def *
     324                 :  3038241529 : ggc_alloc_rtx_def_stat (size_t s CXX_MEM_STAT_INFO)
     325                 :             : {
     326                 :  3038241529 :   return (struct rtx_def *) ggc_internal_alloc (s PASS_MEM_STAT);
     327                 :             : }
     328                 :             : 
     329                 :             : inline union tree_node *
     330                 : 11136242553 : ggc_alloc_tree_node_stat (size_t s CXX_MEM_STAT_INFO)
     331                 :             : {
     332                 : 11136242553 :   return (union tree_node *) ggc_internal_alloc (s PASS_MEM_STAT);
     333                 :             : }
     334                 :             : 
     335                 :             : inline union tree_node *
     336                 : 15169112751 : ggc_alloc_cleared_tree_node_stat (size_t s CXX_MEM_STAT_INFO)
     337                 :             : {
     338                 : 15169112751 :   return (union tree_node *) ggc_internal_cleared_alloc (s PASS_MEM_STAT);
     339                 :             : }
     340                 :             : 
     341                 :             : inline gimple *
     342                 :   297396405 : ggc_alloc_cleared_gimple_statement_stat (size_t s CXX_MEM_STAT_INFO)
     343                 :             : {
     344                 :   297396405 :   return (gimple *) ggc_internal_cleared_alloc (s PASS_MEM_STAT);
     345                 :             : }
     346                 :             : 
     347                 :             : inline void
     348                 :      300423 : gt_ggc_mx (const char *s)
     349                 :             : {
     350                 :      300423 :   ggc_test_and_set_mark (const_cast<char *> (s));
     351                 :             : }
     352                 :             : 
     353                 :             : inline void
     354                 :             : gt_pch_nx (const char *)
     355                 :             : {
     356                 :             : }
     357                 :             : 
     358                 :             : inline void gt_pch_nx (bool) { }
     359                 :             : inline void gt_pch_nx (char) { }
     360                 :             : inline void gt_pch_nx (signed char) { }
     361                 :             : inline void gt_pch_nx (unsigned char) { }
     362                 :             : inline void gt_pch_nx (short) { }
     363                 :             : inline void gt_pch_nx (unsigned short) { }
     364                 :             : inline void gt_pch_nx (int) { }
     365                 :             : inline void gt_pch_nx (unsigned int) { }
     366                 :             : inline void gt_pch_nx (long int) { }
     367                 :             : inline void gt_pch_nx (unsigned long int) { }
     368                 :             : inline void gt_pch_nx (long long int) { }
     369                 :             : inline void gt_pch_nx (unsigned long long int) { }
     370                 :             : 
     371                 :             : inline void gt_ggc_mx (bool) { }
     372                 :             : inline void gt_ggc_mx (char) { }
     373                 :             : inline void gt_ggc_mx (signed char) { }
     374                 :             : inline void gt_ggc_mx (unsigned char) { }
     375                 :             : inline void gt_ggc_mx (short) { }
     376                 :             : inline void gt_ggc_mx (unsigned short) { }
     377                 :             : inline void gt_ggc_mx (int) { }
     378                 :             : inline void gt_ggc_mx (unsigned int) { }
     379                 :             : inline void gt_ggc_mx (long int) { }
     380                 :             : inline void gt_ggc_mx (unsigned long int) { }
     381                 :             : inline void gt_ggc_mx (long long int) { }
     382                 :             : inline void gt_ggc_mx (unsigned long long int) { }
     383                 :             : 
     384                 :             : extern void ggc_common_finalize ();
     385                 :             : 
     386                 :             : #endif
        

Generated by: LCOV version 2.1-beta

LCOV profile is generated on x86_64 machine using following configure options: configure --disable-bootstrap --enable-coverage=opt --enable-languages=c,c++,fortran,go,jit,lto,rust,m2 --enable-host-shared. GCC test suite is run with the built compiler.