ggc-common.c: Update pre-function commentary.
* ggc-common.c: Update pre-function commentary. * ggc-page.c: Likewise. (poison): Remove. (poison_pages): Use memset directly. (ggc_alloc_obj): Likewise. Use a different pattern than poison_pages. (ggc_collect): Poison before sweeping. * ggc-simple.c: Update pre-function commentary. (ggc_alloc_obj): Poison non-zeroed memory. From-SVN: r30275
This commit is contained in:
Richard Henderson
Richard Henderson
parent
e225758aee
commit
cb2ec1510d
@ -1,3 +1,14 @@
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Sat Oct 30 14:31:48 1999 Richard Henderson <rth@cygnus.com>
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* ggc-common.c: Update pre-function commentary.
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* ggc-page.c: Likewise.
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(poison): Remove.
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(poison_pages): Use memset directly.
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(ggc_alloc_obj): Likewise. Use a different pattern than poison_pages.
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(ggc_collect): Poison before sweeping.
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* ggc-simple.c: Update pre-function commentary.
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(ggc_alloc_obj): Poison non-zeroed memory.
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Sat Oct 30 14:28:52 1999 Mark Mitchell <mark@codesourcery.com>
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* ggc-common.c (ggc_print_statistics): Make arguments to fprintf
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@ -97,6 +97,9 @@ ggc_mark_tree_hash_table_ptr (elt)
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ggc_mark_tree_hash_table (*(struct hash_table **) elt);
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}
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/* Type-correct function to pass to ggc_add_root. It just forwards
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ELT (which is really a char **) to ggc_mark_string. */
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static void
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ggc_mark_string_ptr (elt)
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void *elt;
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@ -104,6 +107,12 @@ ggc_mark_string_ptr (elt)
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ggc_mark_string (*(char **)elt);
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}
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/* Add BASE as a new garbage collection root. It is an array of
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length NELT with each element SIZE bytes long. CB is a
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function that will be called with a pointer to each element
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of the array; it is the intention that CB call the appropriate
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routine to mark gc-able memory for that element. */
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void
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ggc_add_root (base, nelt, size, cb)
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void *base;
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@ -121,6 +130,8 @@ ggc_add_root (base, nelt, size, cb)
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roots = x;
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}
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/* Register an array of rtx as a GC root. */
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void
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ggc_add_rtx_root (base, nelt)
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rtx *base;
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@ -129,6 +140,8 @@ ggc_add_rtx_root (base, nelt)
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ggc_add_root (base, nelt, sizeof(rtx), ggc_mark_rtx_ptr);
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}
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/* Register an array of trees as a GC root. */
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void
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ggc_add_tree_root (base, nelt)
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tree *base;
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@ -137,7 +150,7 @@ ggc_add_tree_root (base, nelt)
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ggc_add_root (base, nelt, sizeof(tree), ggc_mark_tree_ptr);
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}
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/* Add V (a varray full of trees) to the list of GC roots. */
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/* Register a varray of trees as a GC root. */
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void
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ggc_add_tree_varray_root (base, nelt)
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@ -148,8 +161,7 @@ ggc_add_tree_varray_root (base, nelt)
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ggc_mark_tree_varray_ptr);
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}
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/* Add HT (a hash-table where ever key is a tree) to the list of GC
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roots. */
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/* Register a hash table of trees as a GC root. */
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void
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ggc_add_tree_hash_table_root (base, nelt)
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@ -160,6 +172,8 @@ ggc_add_tree_hash_table_root (base, nelt)
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ggc_mark_tree_hash_table_ptr);
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}
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/* Register an array of strings as a GC root. */
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void
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ggc_add_string_root (base, nelt)
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char **base;
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@ -168,6 +182,7 @@ ggc_add_string_root (base, nelt)
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ggc_add_root (base, nelt, sizeof (char *), ggc_mark_string_ptr);
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}
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/* Remove the previously registered GC root at BASE. */
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void
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ggc_del_root (base)
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@ -191,6 +206,8 @@ ggc_del_root (base)
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abort();
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}
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/* Iterate through all registered roots and mark each element. */
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void
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ggc_mark_roots ()
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{
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@ -208,6 +225,9 @@ ggc_mark_roots ()
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}
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}
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/* R had not been previously marked, but has now been marked via
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ggc_set_mark. Now recurse and process the children. */
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void
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ggc_mark_rtx_children (r)
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rtx r;
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@ -285,6 +305,9 @@ ggc_mark_rtx_children (r)
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}
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}
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/* V had not been previously marked, but has now been marked via
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ggc_set_mark. Now recurse and process the children. */
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void
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ggc_mark_rtvec_children (v)
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rtvec v;
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@ -296,6 +319,9 @@ ggc_mark_rtvec_children (v)
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ggc_mark_rtx (RTVEC_ELT (v, i));
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}
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/* T had not been previously marked, but has now been marked via
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ggc_set_mark. Now recurse and process the children. */
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void
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ggc_mark_tree_children (t)
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tree t;
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@ -466,7 +492,10 @@ ggc_mark_tree_hash_table (ht)
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hash_traverse (ht, ggc_mark_tree_hash_table_entry, /*info=*/0);
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}
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/* Allocation wrappers. */
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/* Allocate a gc-able string. If CONTENTS is null, then the memory will
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be uninitialized. If LENGTH is -1, then CONTENTS is assumed to be a
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null-terminated string and the memory sized accordingly. Otherwise,
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the memory is filled with LENGTH bytes from CONTENTS. */
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char *
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ggc_alloc_string (contents, length)
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@ -281,7 +281,6 @@ static void clear_marks PROTO ((void));
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static void sweep_pages PROTO ((void));
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#ifdef GGC_POISON
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static void poison PROTO ((void *, size_t));
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static void poison_pages PROTO ((void));
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#endif
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@ -346,8 +345,8 @@ lookup_page_table_entry(p)
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return base[L1][L2];
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}
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/* Set the page table entry for a page. */
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static void
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set_page_table_entry(p, entry)
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void *p;
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@ -384,8 +383,8 @@ found:
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base[L1][L2] = entry;
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}
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/* Prints the page-entry for object size ORDER, for debugging. */
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void
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debug_print_page_list (order)
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int order;
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@ -402,20 +401,9 @@ debug_print_page_list (order)
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fflush (stdout);
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}
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#ifdef GGC_POISON
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/* `Poisons' the region of memory starting at START and extending for
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LEN bytes. */
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static inline void
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poison (start, len)
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void *start;
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size_t len;
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{
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memset (start, 0xa5, len);
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}
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#endif
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/* Allocate SIZE bytes of anonymous memory, preferably near PREF,
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(if non-null). */
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static inline char *
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alloc_anon (pref, size)
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char *pref ATTRIBUTE_UNUSED;
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@ -456,6 +444,7 @@ alloc_anon (pref, size)
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/* Allocate a new page for allocating objects of size 2^ORDER,
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and return an entry for it. The entry is not added to the
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appropriate page_table list. */
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static inline struct page_entry *
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alloc_page (order)
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unsigned order;
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@ -496,7 +485,7 @@ alloc_page (order)
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}
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else
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{
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/* Actually allocate the memory, using mmap. */
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/* Actually allocate the memory. */
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page = alloc_anon (NULL, entry_size);
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}
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@ -525,8 +514,8 @@ alloc_page (order)
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return entry;
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}
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/* For a page that is no longer needed, put it on the free page list. */
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/* Free a page when it's no longer needed. */
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static inline void
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free_page (entry)
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page_entry *entry;
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@ -542,8 +531,8 @@ free_page (entry)
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G.free_pages = entry;
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}
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/* Release the free page cache to the system. */
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/* Release the page cache to the system. */
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static inline void
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release_pages ()
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{
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@ -598,9 +587,9 @@ release_pages ()
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G.free_pages = NULL;
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}
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/* This table provides a fast way to determine ceil(log_2(size)) for
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allocation requests. The minimum allocation size is four bytes. */
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static unsigned char const size_lookup[257] =
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{
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2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4,
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@ -624,6 +613,7 @@ static unsigned char const size_lookup[257] =
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/* Allocate a chunk of memory of SIZE bytes. If ZERO is non-zero, the
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memory is zeroed; otherwise, its contents are undefined. */
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void *
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ggc_alloc_obj (size, zero)
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size_t size;
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@ -721,8 +711,9 @@ ggc_alloc_obj (size, zero)
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#ifdef GGC_POISON
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/* `Poison' the entire allocated object before zeroing the requested area,
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so that bytes beyond the end, if any, will not necessarily be zero. */
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poison (result, 1 << order);
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memset (result, 0xaf, 1 << order);
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#endif
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if (zero)
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memset (result, 0, size);
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@ -738,10 +729,10 @@ ggc_alloc_obj (size, zero)
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return result;
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}
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/* If P is not marked, marks it and returns 0. Otherwise returns 1.
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/* If P is not marked, marks it and return false. Otherwise return true.
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P must have been allocated by the GC allocator; it mustn't point to
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static objects, stack variables, or memory allocated with malloc. */
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int
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ggc_set_mark (p)
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void *p;
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@ -780,6 +771,8 @@ ggc_set_mark (p)
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return 0;
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}
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/* Mark P, but check first that it was allocated by the collector. */
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void
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ggc_mark_if_gcable (p)
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void *p;
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@ -788,6 +781,8 @@ ggc_mark_if_gcable (p)
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ggc_set_mark (p);
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}
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/* Return the size of the gc-able object P. */
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size_t
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ggc_get_size (p)
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void *p;
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@ -797,6 +792,7 @@ ggc_get_size (p)
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}
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/* Initialize the ggc-mmap allocator. */
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void
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init_ggc ()
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{
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@ -841,6 +837,8 @@ init_ggc ()
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ggc_add_string_root (&empty_string, 1);
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}
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/* Increment the `GC context'. Objects allocated in an outer context
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are never freed, eliminating the need to register their roots. */
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void
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ggc_push_context ()
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@ -852,6 +850,8 @@ ggc_push_context ()
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abort ();
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}
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/* Decrement the `GC context'. All objects allocated since the
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previous ggc_push_context are migrated to the outer context. */
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void
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ggc_pop_context ()
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@ -890,6 +890,8 @@ ggc_pop_context ()
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}
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}
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/* Unmark all objects. */
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static inline void
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clear_marks ()
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{
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@ -932,6 +934,9 @@ clear_marks ()
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}
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}
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/* Free all empty pages. Partially empty pages need no attention
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because the `mark' bit doubles as an `unused' bit. */
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static inline void
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sweep_pages ()
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{
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@ -1024,6 +1029,8 @@ sweep_pages ()
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}
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#ifdef GGC_POISON
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/* Clobber all free objects. */
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static inline void
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poison_pages ()
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{
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@ -1052,13 +1059,15 @@ poison_pages ()
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word = i / HOST_BITS_PER_LONG;
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bit = i % HOST_BITS_PER_LONG;
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if (((p->in_use_p[word] >> bit) & 1) == 0)
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poison (p->page + i * size, size);
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memset (p->page + i * size, 0xa5, size);
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}
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}
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}
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}
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#endif
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/* Top level mark-and-sweep routine. */
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void
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ggc_collect ()
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{
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@ -1086,12 +1095,13 @@ ggc_collect ()
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clear_marks ();
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ggc_mark_roots ();
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sweep_pages ();
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#ifdef GGC_POISON
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poison_pages ();
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#endif
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sweep_pages ();
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G.allocated_last_gc = G.allocated;
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if (G.allocated_last_gc < GGC_MIN_LAST_ALLOCATED)
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G.allocated_last_gc = GGC_MIN_LAST_ALLOCATED;
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@ -200,6 +200,10 @@ ggc_alloc_obj (size, zero)
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if (zero)
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memset (&x->u, 0, size);
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#ifdef GGC_POISON
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else
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memset (&x->u, 0xaf, size);
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#endif
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tree_insert (x);
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G.allocated += size;
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@ -232,6 +236,8 @@ ggc_set_mark (p)
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return 0;
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}
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/* Mark a node, but check first to see that it's really gc-able memory. */
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void
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ggc_mark_if_gcable (p)
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void *p;
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@ -253,6 +259,8 @@ ggc_mark_if_gcable (p)
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G.objects += 1;
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}
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/* Return the size of the gc-able object P. */
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size_t
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ggc_get_size (p)
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void *p;
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@ -262,6 +270,8 @@ ggc_get_size (p)
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return x->size;
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}
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/* Unmark all objects. */
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static void
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clear_marks (x)
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struct ggc_mem *x;
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@ -273,6 +283,8 @@ clear_marks (x)
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clear_marks (x->sub[1]);
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}
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/* Free all objects in the current context that are not marked. */
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static void
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sweep_objs (root)
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struct ggc_mem **root;
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