diff options
Diffstat (limited to 'gcc/ggc.h')
| -rw-r--r-- | gcc/ggc.h | 184 |
1 files changed, 135 insertions, 49 deletions
@@ -18,9 +18,6 @@ along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -#include "varray.h" -#include "gtype-desc.h" - /* Symbols are marked with `ggc' for `gcc gc' so as not to interfere with an external gc library that might be linked in. */ @@ -29,10 +26,39 @@ extern const char empty_string[]; /* empty string */ extern const char digit_vector[]; /* "0" .. "9" */ #define digit_string(d) (digit_vector + ((d) * 2)) -/* Manipulate global roots that are needed between calls to gc. - THIS ROUTINE IS OBSOLETE, do not use it for new code. */ -extern void ggc_add_root PARAMS ((void *base, int nelt, - int size, void (*)(void *))); +/* Internal functions and data structures used by the GTY + machinery. */ + +/* The first parameter is a pointer to a pointer, the second a cookie. */ +typedef void (*gt_pointer_operator) PARAMS ((void *, void *)); + +#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) + PARAMS ((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) + PARAMS ((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 + PARAMS ((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 + PARAMS ((void *, void *, gt_handle_reorder)); + +/* Mark the object in the first parameter and anything it points to. */ +typedef void (*gt_pointer_walker) PARAMS ((void *)); /* Structures for the easy way to mark roots. In an array, terminated by having base == NULL.*/ @@ -40,12 +66,15 @@ struct ggc_root_tab { void *base; size_t nelt; size_t stride; - void (*cb) PARAMS ((void *)); + gt_pointer_walker cb; + gt_pointer_walker pchw; }; -#define LAST_GGC_ROOT_TAB { NULL, 0, 0, NULL } +#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_cache_rtab[]; +extern const struct ggc_root_tab * const gt_pch_scalar_rtab[]; /* Structure for hash table cache marking. */ struct htab; @@ -53,23 +82,19 @@ struct ggc_cache_tab { struct htab * *base; size_t nelt; size_t stride; - void (*cb) PARAMS ((void *)); + gt_pointer_walker cb; + gt_pointer_walker pchw; int (*marked_p) PARAMS ((const void *)); }; -#define LAST_GGC_CACHE_TAB { NULL, 0, 0, NULL, NULL } +#define LAST_GGC_CACHE_TAB { NULL, 0, 0, NULL, NULL, NULL } /* Pointers to arrays of ggc_cache_tab, terminated by NULL. */ extern const struct ggc_cache_tab * const gt_ggc_cache_rtab[]; -extern void ggc_mark_roots PARAMS ((void)); - /* 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_rtx gt_ggc_m_7rtx_def -#define ggc_mark_tree gt_ggc_m_9tree_node - #define ggc_mark(EXPR) \ do { \ const void *const a__ = (EXPR); \ @@ -77,11 +102,45 @@ extern void ggc_mark_roots PARAMS ((void)); ggc_set_mark (a__); \ } while (0) -/* A GC implementation must provide these functions. */ +/* 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; non-zero 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 PARAMS ((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 PARAMS ((const void *)); + +/* Mark the entries in the string pool. */ +extern void ggc_mark_stringpool PARAMS ((void)); + +/* Call ggc_set_mark on all the roots. */ + +extern void ggc_mark_roots PARAMS ((void)); + +/* Save and restore the string pool entries for PCH. */ + +extern void gt_pch_save_stringpool PARAMS ((void)); +extern void gt_pch_restore_stringpool PARAMS ((void)); + +/* PCH and GGC handling for strings, mostly trivial. */ + +extern void gt_pch_p_S PARAMS ((void *, void *, + gt_pointer_operator, void *)); +extern void gt_pch_n_S PARAMS ((const void *)); +extern void gt_ggc_m_S PARAMS ((void *)); + +/* Initialise the string pool. */ +extern void init_stringpool PARAMS ((void)); + +/* A GC implementation must provide these functions. They are internal + to the GC system. */ /* Initialize the garbage collector. */ extern void init_ggc PARAMS ((void)); -extern void init_stringpool PARAMS ((void)); /* Start a new GGC context. Memory allocated in previous contexts will not be collected while the new context is active. */ @@ -91,6 +150,48 @@ extern void ggc_push_context PARAMS ((void)); will be merged with the old context. */ extern void ggc_pop_context PARAMS ((void)); +struct ggc_pch_data; + +/* Return a new ggc_pch_data structure. */ +extern struct ggc_pch_data *init_ggc_pch PARAMS ((void)); + +/* The second parameter and third parameters give the address and size + of an object. Update the ggc_pch_data structure with as much of + that information as is necessary. */ +extern void ggc_pch_count_object PARAMS ((struct ggc_pch_data *, + void *, size_t)); + +/* Return the total size of the data to be written to hold all + the objects previously passed to ggc_pch_count_object. */ +extern size_t ggc_pch_total_size PARAMS ((struct ggc_pch_data *)); + +/* The objects, when read, will most likely be at the address + in the second parameter. */ +extern void ggc_pch_this_base PARAMS ((struct ggc_pch_data *, + void *)); + +/* Assuming that the objects really do end up at the address + passed to ggc_pch_this_base, return the address of this object. */ +extern char *ggc_pch_alloc_object PARAMS ((struct ggc_pch_data *, + void *, size_t)); + +/* Write out any initial information required. */ +extern void ggc_pch_prepare_write PARAMS ((struct ggc_pch_data *, + FILE *)); +/* Write out this object, including any padding. */ +extern void ggc_pch_write_object PARAMS ((struct ggc_pch_data *, + FILE *, void *, void *, + size_t)); +/* All objects have been written, write out any final information + required. */ +extern void ggc_pch_finish PARAMS ((struct ggc_pch_data *, + FILE *)); + +/* A PCH file has just been read in at the address specified second + parameter. Set up the GC implementation for the new objects. */ +extern void ggc_pch_read PARAMS ((FILE *, void *)); + + /* Allocation. */ /* The internal primitive. */ @@ -115,6 +216,13 @@ extern void *ggc_calloc PARAMS ((size_t, size_t)); #define htab_create_ggc(SIZE, HASH, EQ, DEL) \ htab_create_alloc (SIZE, HASH, EQ, DEL, ggc_calloc, NULL) +#define splay_tree_new_ggc(COMPARE) \ + splay_tree_new_with_allocator (COMPARE, NULL, NULL, \ + &ggc_splay_alloc, &ggc_splay_dont_free, \ + NULL) +extern PTR ggc_splay_alloc PARAMS ((int, void *)); +extern void ggc_splay_dont_free PARAMS ((void *, void *)); + /* 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. */ @@ -128,47 +236,25 @@ extern const char *ggc_alloc_string PARAMS ((const char *contents, function is called, not during allocations. */ extern void ggc_collect PARAMS ((void)); -/* 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 PARAMS ((const void *)); +/* Return the number of bytes allocated at the indicated address. */ +extern size_t ggc_get_size PARAMS ((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 PARAMS ((const void *)); +/* Write out all GCed objects to F. */ +extern void gt_pch_save PARAMS ((FILE *f)); +/* Read objects previously saved with gt_pch_save from F. */ +extern void gt_pch_restore PARAMS ((FILE *f)); + /* Statistics. */ /* This structure contains the statistics common to all collectors. Particular collectors can extend this structure. */ typedef struct ggc_statistics { - /* The Ith element is the number of nodes allocated with code I. */ - unsigned num_trees[256]; - /* The Ith element is the number of bytes allocated by nodes with - code I. */ - size_t size_trees[256]; - /* The Ith element is the number of nodes allocated with code I. */ - unsigned num_rtxs[256]; - /* The Ith element is the number of bytes allocated by nodes with - code I. */ - size_t size_rtxs[256]; - /* The total size of the tree nodes allocated. */ - size_t total_size_trees; - /* The total size of the RTL nodes allocated. */ - size_t total_size_rtxs; - /* The total number of tree nodes allocated. */ - unsigned total_num_trees; - /* The total number of RTL nodes allocated. */ - unsigned total_num_rtxs; + /* At present, we don't really gather any interesting statistics. */ + int unused; } ggc_statistics; -/* Return the number of bytes allocated at the indicated address. */ -extern size_t ggc_get_size PARAMS ((const void *)); - /* Used by the various collectors to gather and print statistics that do not depend on the collector in use. */ extern void ggc_print_common_statistics PARAMS ((FILE *, ggc_statistics *)); |