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/* Garbage collection for the GNU compiler.
Copyright (C) 1998-2019 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_GGC_H
#define GCC_GGC_H
/* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with
an external gc library that might be linked in. */
/* Internal functions and data structures used by the GTY
machinery, including the generated gt*.[hc] files. */
#include "gtype-desc.h"
/* One of these applies its third parameter (with cookie in the fourth
parameter) to each pointer in the object pointed to by the first
parameter, using the second parameter. */
typedef void (*gt_note_pointers) (void *, void *, gt_pointer_operator,
void *);
/* One of these is called before objects are re-ordered in memory.
The first parameter is the original object, the second is the
subobject that has had its pointers reordered, the third parameter
can compute the new values of a pointer when given the cookie in
the fourth parameter. */
typedef void (*gt_handle_reorder) (void *, void *, gt_pointer_operator,
void *);
/* Used by the gt_pch_n_* routines. Register an object in the hash table. */
extern int gt_pch_note_object (void *, void *, gt_note_pointers);
/* Used by the gt_pch_n_* routines. Register that an object has a reorder
function. */
extern void gt_pch_note_reorder (void *, void *, gt_handle_reorder);
/* generated function to clear caches in gc memory. */
extern void gt_clear_caches ();
/* Mark the object in the first parameter and anything it points to. */
typedef void (*gt_pointer_walker) (void *);
/* Structures for the easy way to mark roots.
In an array, terminated by having base == NULL. */
struct ggc_root_tab {
void *base;
size_t nelt;
size_t stride;
gt_pointer_walker cb;
gt_pointer_walker pchw;
};
#define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL, NULL }
/* Pointers to arrays of ggc_root_tab, terminated by NULL. */
extern const struct ggc_root_tab * const gt_ggc_rtab[];
extern const struct ggc_root_tab * const gt_ggc_deletable_rtab[];
extern const struct ggc_root_tab * const gt_pch_scalar_rtab[];
/* If EXPR is not NULL and previously unmarked, mark it and evaluate
to true. Otherwise evaluate to false. */
#define ggc_test_and_set_mark(EXPR) \
((EXPR) != NULL && ((void *) (EXPR)) != (void *) 1 && ! ggc_set_mark (EXPR))
#define ggc_mark(EXPR) \
do { \
const void *const a__ = (EXPR); \
if (a__ != NULL && a__ != (void *) 1) \
ggc_set_mark (a__); \
} while (0)
/* Actually set the mark on a particular region of memory, but don't
follow pointers. This function is called by ggc_mark_*. It
returns zero if the object was not previously marked; nonzero if
the object was already marked, or if, for any other reason,
pointers in this data structure should not be traversed. */
extern int ggc_set_mark (const void *);
/* Return 1 if P has been marked, zero otherwise.
P must have been allocated by the GC allocator; it mustn't point to
static objects, stack variables, or memory allocated with malloc. */
extern int ggc_marked_p (const void *);
/* PCH and GGC handling for strings, mostly trivial. */
extern void gt_pch_n_S (const void *);
extern void gt_ggc_m_S (const void *);
/* End of GTY machinery API. */
/* Initialize the string pool. */
extern void init_stringpool (void);
/* Initialize the garbage collector. */
extern void init_ggc (void);
/* When true, identifier nodes are considered as GC roots. When
false, identifier nodes are treated like any other GC-allocated
object, and the identifier hash table is treated as a weak
hash. */
extern bool ggc_protect_identifiers;
/* Write out all GCed objects to F. */
extern void gt_pch_save (FILE *f);
/* Allocation. */
/* The internal primitive. */
extern void *ggc_internal_alloc (size_t, void (*)(void *), size_t,
size_t CXX_MEM_STAT_INFO)
ATTRIBUTE_MALLOC;
inline void *
ggc_internal_alloc (size_t s CXX_MEM_STAT_INFO)
{
return ggc_internal_alloc (s, NULL, 0, 1 PASS_MEM_STAT);
}
extern size_t ggc_round_alloc_size (size_t requested_size);
/* Allocates cleared memory. */
extern void *ggc_internal_cleared_alloc (size_t, void (*)(void *),
size_t, size_t
CXX_MEM_STAT_INFO) ATTRIBUTE_MALLOC;
inline void *
ggc_internal_cleared_alloc (size_t s CXX_MEM_STAT_INFO)
{
return ggc_internal_cleared_alloc (s, NULL, 0, 1 PASS_MEM_STAT);
}
/* Resize a block. */
extern void *ggc_realloc (void *, size_t CXX_MEM_STAT_INFO);
/* Free a block. To be used when known for certain it's not reachable. */
extern void ggc_free (void *);
extern void dump_ggc_loc_statistics ();
/* Reallocator. */
#define GGC_RESIZEVEC(T, P, N) \
((T *) ggc_realloc ((P), (N) * sizeof (T) MEM_STAT_INFO))
template<typename T>
void
finalize (void *p)
{
static_cast<T *> (p)->~T ();
}
template<typename T>
inline bool
need_finalization_p ()
{
#if GCC_VERSION >= 4003
return !__has_trivial_destructor (T);
#else
return true;
#endif
}
template<typename T>
inline T *
ggc_alloc (ALONE_CXX_MEM_STAT_INFO)
{
if (need_finalization_p<T> ())
return static_cast<T *> (ggc_internal_alloc (sizeof (T), finalize<T>, 0, 1
PASS_MEM_STAT));
else
return static_cast<T *> (ggc_internal_alloc (sizeof (T), NULL, 0, 1
PASS_MEM_STAT));
}
/* GGC allocation function that does not call finalizer for type
that have need_finalization_p equal to true. User is responsible
for calling of the destructor. */
template<typename T>
inline T *
ggc_alloc_no_dtor (ALONE_CXX_MEM_STAT_INFO)
{
return static_cast<T *> (ggc_internal_alloc (sizeof (T), NULL, 0, 1
PASS_MEM_STAT));
}
template<typename T>
inline T *
ggc_cleared_alloc (ALONE_CXX_MEM_STAT_INFO)
{
if (need_finalization_p<T> ())
return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T),
finalize<T>, 0, 1
PASS_MEM_STAT));
else
return static_cast<T *> (ggc_internal_cleared_alloc (sizeof (T), NULL, 0, 1
PASS_MEM_STAT));
}
template<typename T>
inline T *
ggc_vec_alloc (size_t c CXX_MEM_STAT_INFO)
{
if (need_finalization_p<T> ())
return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), finalize<T>,
sizeof (T), c PASS_MEM_STAT));
else
return static_cast<T *> (ggc_internal_alloc (c * sizeof (T), NULL, 0, 0
PASS_MEM_STAT));
}
template<typename T>
inline T *
ggc_cleared_vec_alloc (size_t c CXX_MEM_STAT_INFO)
{
if (need_finalization_p<T> ())
return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T),
finalize<T>,
sizeof (T), c
PASS_MEM_STAT));
else
return static_cast<T *> (ggc_internal_cleared_alloc (c * sizeof (T), NULL,
0, 0 PASS_MEM_STAT));
}
inline void *
ggc_alloc_atomic (size_t s CXX_MEM_STAT_INFO)
{
return ggc_internal_alloc (s PASS_MEM_STAT);
}
/* Allocate a gc-able string, and fill it with LENGTH bytes from CONTENTS.
If LENGTH is -1, then CONTENTS is assumed to be a
null-terminated string and the memory sized accordingly. */
extern const char *ggc_alloc_string (const char *contents, int length
CXX_MEM_STAT_INFO);
/* Make a copy of S, in GC-able memory. */
#define ggc_strdup(S) ggc_alloc_string ((S), -1 MEM_STAT_INFO)
/* Invoke the collector. Garbage collection occurs only when this
function is called, not during allocations. */
extern void ggc_collect (void);
/* Return unused memory pages to the system. */
extern void ggc_trim (void);
/* Assume that all GGC memory is reachable and grow the limits for next collection. */
extern void ggc_grow (void);
/* Register an additional root table. This can be useful for some
plugins. Does nothing if the passed pointer is NULL. */
extern void ggc_register_root_tab (const struct ggc_root_tab *);
/* Read objects previously saved with gt_pch_save from F. */
extern void gt_pch_restore (FILE *f);
/* Statistics. */
/* Print allocation statistics. */
extern void ggc_print_statistics (void);
extern void stringpool_statistics (void);
/* Heuristics. */
extern void init_ggc_heuristics (void);
#define ggc_alloc_rtvec_sized(NELT) \
(rtvec_def *) ggc_internal_alloc (sizeof (struct rtvec_def) \
+ ((NELT) - 1) * sizeof (rtx)) \
/* Memory statistics passing versions of some allocators. Too few of them to
make gengtype produce them, so just define the needed ones here. */
inline struct rtx_def *
ggc_alloc_rtx_def_stat (size_t s CXX_MEM_STAT_INFO)
{
return (struct rtx_def *) ggc_internal_alloc (s PASS_MEM_STAT);
}
inline union tree_node *
ggc_alloc_tree_node_stat (size_t s CXX_MEM_STAT_INFO)
{
return (union tree_node *) ggc_internal_alloc (s PASS_MEM_STAT);
}
inline union tree_node *
ggc_alloc_cleared_tree_node_stat (size_t s CXX_MEM_STAT_INFO)
{
return (union tree_node *) ggc_internal_cleared_alloc (s PASS_MEM_STAT);
}
inline gimple *
ggc_alloc_cleared_gimple_statement_stat (size_t s CXX_MEM_STAT_INFO)
{
return (gimple *) ggc_internal_cleared_alloc (s PASS_MEM_STAT);
}
inline void
gt_ggc_mx (const char *s)
{
ggc_test_and_set_mark (const_cast<char *> (s));
}
inline void
gt_pch_nx (const char *)
{
}
inline void
gt_ggc_mx (int)
{
}
inline void
gt_pch_nx (int)
{
}
inline void
gt_pch_nx (unsigned int)
{
}
#endif
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