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-rw-r--r--gc/mallocx.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/gc/mallocx.c b/gc/mallocx.c
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+/*
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996 by Silicon Graphics. All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+/*
+ * These are extra allocation routines which are likely to be less
+ * frequently used than those in malloc.c. They are separate in the
+ * hope that the .o file will be excluded from statically linked
+ * executables. We should probably break this up further.
+ */
+
+#include <stdio.h>
+#include "gc_priv.h"
+
+extern ptr_t GC_clear_stack(); /* in misc.c, behaves like identity */
+void GC_extend_size_map(); /* in misc.c. */
+GC_bool GC_alloc_reclaim_list(); /* in malloc.c */
+
+/* Some externally visible but unadvertised variables to allow access to */
+/* free lists from inlined allocators without including gc_priv.h */
+/* or introducing dependencies on internal data structure layouts. */
+ptr_t * CONST GC_objfreelist_ptr = GC_objfreelist;
+ptr_t * CONST GC_aobjfreelist_ptr = GC_aobjfreelist;
+ptr_t * CONST GC_uobjfreelist_ptr = GC_uobjfreelist;
+# ifdef ATOMIC_UNCOLLECTABLE
+ ptr_t * CONST GC_auobjfreelist_ptr = GC_auobjfreelist;
+# endif
+
+/* Allocate a composite object of size n bytes. The caller guarantees */
+/* that pointers past the first page are not relevant. Caller holds */
+/* allocation lock. */
+ptr_t GC_generic_malloc_inner_ignore_off_page(lb, k)
+register size_t lb;
+register int k;
+{
+ register struct hblk * h;
+ register word n_blocks;
+ register word lw;
+ register ptr_t op;
+
+ if (lb <= HBLKSIZE)
+ return(GC_generic_malloc_inner((word)lb, k));
+ n_blocks = divHBLKSZ(ADD_SLOP(lb) + HDR_BYTES + HBLKSIZE-1);
+ if (!GC_is_initialized) GC_init_inner();
+ /* Do our share of marking work */
+ if(GC_incremental && !GC_dont_gc)
+ GC_collect_a_little_inner((int)n_blocks);
+ lw = ROUNDED_UP_WORDS(lb);
+ h = GC_allochblk(lw, k, IGNORE_OFF_PAGE);
+# ifdef USE_MUNMAP
+ if (0 == h) {
+ GC_merge_unmapped();
+ h = GC_allochblk(lw, k, IGNORE_OFF_PAGE);
+ }
+# endif
+ while (0 == h && GC_collect_or_expand(n_blocks, TRUE)) {
+ h = GC_allochblk(lw, k, IGNORE_OFF_PAGE);
+ }
+ if (h == 0) {
+ op = 0;
+ } else {
+ op = (ptr_t) (h -> hb_body);
+ GC_words_wasted += BYTES_TO_WORDS(n_blocks * HBLKSIZE) - lw;
+ }
+ GC_words_allocd += lw;
+ return((ptr_t)op);
+}
+
+ptr_t GC_generic_malloc_ignore_off_page(lb, k)
+register size_t lb;
+register int k;
+{
+ register ptr_t result;
+ DCL_LOCK_STATE;
+
+ GC_INVOKE_FINALIZERS();
+ DISABLE_SIGNALS();
+ LOCK();
+ result = GC_generic_malloc_inner_ignore_off_page(lb,k);
+ UNLOCK();
+ ENABLE_SIGNALS();
+ if (0 == result) {
+ return((*GC_oom_fn)(lb));
+ } else {
+ return(result);
+ }
+}
+
+# if defined(__STDC__) || defined(__cplusplus)
+ void * GC_malloc_ignore_off_page(size_t lb)
+# else
+ char * GC_malloc_ignore_off_page(lb)
+ register size_t lb;
+# endif
+{
+ return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, NORMAL));
+}
+
+# if defined(__STDC__) || defined(__cplusplus)
+ void * GC_malloc_atomic_ignore_off_page(size_t lb)
+# else
+ char * GC_malloc_atomic_ignore_off_page(lb)
+ register size_t lb;
+# endif
+{
+ return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, PTRFREE));
+}
+
+/* Increment GC_words_allocd from code that doesn't have direct access */
+/* to GC_arrays. */
+# ifdef __STDC__
+void GC_incr_words_allocd(size_t n)
+{
+ GC_words_allocd += n;
+}
+
+/* The same for GC_mem_freed. */
+void GC_incr_mem_freed(size_t n)
+{
+ GC_mem_freed += n;
+}
+# endif /* __STDC__ */
+
+/* Analogous to the above, but assumes a small object size, and */
+/* bypasses MERGE_SIZES mechanism. Used by gc_inline.h. */
+#ifdef __STDC__
+ ptr_t GC_generic_malloc_words_small(size_t lw, int k)
+#else
+ ptr_t GC_generic_malloc_words_small(lw, k)
+ register word lw;
+ register int k;
+#endif
+{
+register ptr_t op;
+register ptr_t *opp;
+register struct obj_kind * kind = GC_obj_kinds + k;
+DCL_LOCK_STATE;
+
+ GC_INVOKE_FINALIZERS();
+ DISABLE_SIGNALS();
+ LOCK();
+ opp = &(kind -> ok_freelist[lw]);
+ if( (op = *opp) == 0 ) {
+ if (!GC_is_initialized) {
+ GC_init_inner();
+ }
+ if (kind -> ok_reclaim_list != 0 || GC_alloc_reclaim_list(kind)) {
+ op = GC_clear_stack(GC_allocobj((word)lw, k));
+ }
+ if (op == 0) {
+ UNLOCK();
+ ENABLE_SIGNALS();
+ return ((*GC_oom_fn)(WORDS_TO_BYTES(lw)));
+ }
+ }
+ *opp = obj_link(op);
+ obj_link(op) = 0;
+ GC_words_allocd += lw;
+ UNLOCK();
+ ENABLE_SIGNALS();
+ return((ptr_t)op);
+}
+
+#if defined(THREADS) && !defined(SRC_M3)
+/* Return a list of 1 or more objects of the indicated size, linked */
+/* through the first word in the object. This has the advantage that */
+/* it acquires the allocation lock only once, and may greatly reduce */
+/* time wasted contending for the allocation lock. Typical usage would */
+/* be in a thread that requires many items of the same size. It would */
+/* keep its own free list in thread-local storage, and call */
+/* GC_malloc_many or friends to replenish it. (We do not round up */
+/* object sizes, since a call indicates the intention to consume many */
+/* objects of exactly this size.) */
+/* Note that the client should usually clear the link field. */
+ptr_t GC_generic_malloc_many(lb, k)
+register word lb;
+register int k;
+{
+ptr_t op;
+register ptr_t p;
+ptr_t *opp;
+word lw;
+register word my_words_allocd;
+DCL_LOCK_STATE;
+
+ if (!SMALL_OBJ(lb)) {
+ op = GC_generic_malloc(lb, k);
+ if(0 != op) obj_link(op) = 0;
+ return(op);
+ }
+ lw = ALIGNED_WORDS(lb);
+ GC_INVOKE_FINALIZERS();
+ DISABLE_SIGNALS();
+ LOCK();
+ opp = &(GC_obj_kinds[k].ok_freelist[lw]);
+ if( (op = *opp) == 0 ) {
+ if (!GC_is_initialized) {
+ GC_init_inner();
+ }
+ op = GC_clear_stack(GC_allocobj(lw, k));
+ if (op == 0) {
+ UNLOCK();
+ ENABLE_SIGNALS();
+ op = (*GC_oom_fn)(lb);
+ if(0 != op) obj_link(op) = 0;
+ return(op);
+ }
+ }
+ *opp = 0;
+ my_words_allocd = 0;
+ for (p = op; p != 0; p = obj_link(p)) {
+ my_words_allocd += lw;
+ if (my_words_allocd >= BODY_SZ) {
+ *opp = obj_link(p);
+ obj_link(p) = 0;
+ break;
+ }
+ }
+ GC_words_allocd += my_words_allocd;
+
+out:
+ UNLOCK();
+ ENABLE_SIGNALS();
+ return(op);
+
+}
+
+void * GC_malloc_many(size_t lb)
+{
+ return(GC_generic_malloc_many(lb, NORMAL));
+}
+
+/* Note that the "atomic" version of this would be unsafe, since the */
+/* links would not be seen by the collector. */
+# endif
+
+/* Allocate lb bytes of pointerful, traced, but not collectable data */
+# ifdef __STDC__
+ GC_PTR GC_malloc_uncollectable(size_t lb)
+# else
+ GC_PTR GC_malloc_uncollectable(lb)
+ size_t lb;
+# endif
+{
+register ptr_t op;
+register ptr_t *opp;
+register word lw;
+DCL_LOCK_STATE;
+
+ if( SMALL_OBJ(lb) ) {
+# ifdef MERGE_SIZES
+# ifdef ADD_BYTE_AT_END
+ if (lb != 0) lb--;
+ /* We don't need the extra byte, since this won't be */
+ /* collected anyway. */
+# endif
+ lw = GC_size_map[lb];
+# else
+ lw = ALIGNED_WORDS(lb);
+# endif
+ opp = &(GC_uobjfreelist[lw]);
+ FASTLOCK();
+ if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
+ /* See above comment on signals. */
+ *opp = obj_link(op);
+ obj_link(op) = 0;
+ GC_words_allocd += lw;
+ /* Mark bit ws already set on free list. It will be */
+ /* cleared only temporarily during a collection, as a */
+ /* result of the normal free list mark bit clearing. */
+ GC_non_gc_bytes += WORDS_TO_BYTES(lw);
+ FASTUNLOCK();
+ return((GC_PTR) op);
+ }
+ FASTUNLOCK();
+ op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
+ } else {
+ op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
+ }
+ if (0 == op) return(0);
+ /* We don't need the lock here, since we have an undisguised */
+ /* pointer. We do need to hold the lock while we adjust */
+ /* mark bits. */
+ {
+ register struct hblk * h;
+
+ h = HBLKPTR(op);
+ lw = HDR(h) -> hb_sz;
+
+ DISABLE_SIGNALS();
+ LOCK();
+ GC_set_mark_bit(op);
+ GC_non_gc_bytes += WORDS_TO_BYTES(lw);
+ UNLOCK();
+ ENABLE_SIGNALS();
+ return((GC_PTR) op);
+ }
+}
+
+# ifdef ATOMIC_UNCOLLECTABLE
+/* Allocate lb bytes of pointerfree, untraced, uncollectable data */
+/* This is normally roughly equivalent to the system malloc. */
+/* But it may be useful if malloc is redefined. */
+# ifdef __STDC__
+ GC_PTR GC_malloc_atomic_uncollectable(size_t lb)
+# else
+ GC_PTR GC_malloc_atomic_uncollectable(lb)
+ size_t lb;
+# endif
+{
+register ptr_t op;
+register ptr_t *opp;
+register word lw;
+DCL_LOCK_STATE;
+
+ if( SMALL_OBJ(lb) ) {
+# ifdef MERGE_SIZES
+# ifdef ADD_BYTE_AT_END
+ if (lb != 0) lb--;
+ /* We don't need the extra byte, since this won't be */
+ /* collected anyway. */
+# endif
+ lw = GC_size_map[lb];
+# else
+ lw = ALIGNED_WORDS(lb);
+# endif
+ opp = &(GC_auobjfreelist[lw]);
+ FASTLOCK();
+ if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
+ /* See above comment on signals. */
+ *opp = obj_link(op);
+ obj_link(op) = 0;
+ GC_words_allocd += lw;
+ /* Mark bit was already set while object was on free list. */
+ GC_non_gc_bytes += WORDS_TO_BYTES(lw);
+ FASTUNLOCK();
+ return((GC_PTR) op);
+ }
+ FASTUNLOCK();
+ op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
+ } else {
+ op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
+ }
+ if (0 == op) return(0);
+ /* We don't need the lock here, since we have an undisguised */
+ /* pointer. We do need to hold the lock while we adjust */
+ /* mark bits. */
+ {
+ register struct hblk * h;
+
+ h = HBLKPTR(op);
+ lw = HDR(h) -> hb_sz;
+
+ DISABLE_SIGNALS();
+ LOCK();
+ GC_set_mark_bit(op);
+ GC_non_gc_bytes += WORDS_TO_BYTES(lw);
+ UNLOCK();
+ ENABLE_SIGNALS();
+ return((GC_PTR) op);
+ }
+}
+
+#endif /* ATOMIC_UNCOLLECTABLE */
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