2 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3 * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
5 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
6 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
8 * Permission is hereby granted to use or copy this program
9 * for any purpose, provided the above notices are retained on all copies.
10 * Permission to modify the code and to distribute modified code is granted,
11 * provided the above notices are retained, and a notice that the code was
12 * modified is included with the above copyright notice.
15 /* Boehm, July 31, 1995 5:02 pm PDT */
20 * This is an allocator interface tuned for gcj (the GNU static
23 * Each allocated object has a pointer in its first word to a vtable,
24 * which for our purposes is simply a structure describing the type of
26 * This descriptor structure contains a GC marking descriptor at offset
29 * It is hoped that this interface may also be useful for other systems,
30 * possibly with some tuning of the constants. But the immediate goal
31 * is to get better gcj performance.
34 * 1) We have an ANSI conforming C compiler.
35 * 2) Counting on explicit initialization of this interface is OK.
36 * 3) FASTLOCK is not a significant win.
39 #include "private/gc_pmark.h"
41 #include "private/dbg_mlc.h"
43 GC_bool GC_gcj_malloc_initialized = FALSE;
45 int GC_gcj_kind; /* Object kind for objects with descriptors */
47 int GC_gcj_debug_kind; /* The kind of objects that is always marked */
48 /* with a mark proc call. */
50 ptr_t * GC_gcjobjfreelist;
51 ptr_t * GC_gcjdebugobjfreelist;
53 /* Caller does not hold allocation lock. */
54 void GC_init_gcj_malloc(int mp_index, void * /* really GC_mark_proc */mp)
57 GC_bool ignore_gcj_info;
60 GC_init(); /* In case it's not already done. */
62 if (GC_gcj_malloc_initialized) {
66 GC_gcj_malloc_initialized = TRUE;
67 ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
68 if (GC_print_stats && ignore_gcj_info) {
69 GC_log_printf("Gcj-style type information is disabled!\n");
71 GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
72 GC_mark_procs[mp_index] = (GC_mark_proc)mp;
73 if (mp_index >= GC_n_mark_procs) ABORT("GC_init_gcj_malloc: bad index");
74 /* Set up object kind gcj-style indirect descriptor. */
75 GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
76 if (ignore_gcj_info) {
77 /* Use a simple length-based descriptor, thus forcing a fully */
78 /* conservative scan. */
79 GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
83 GC_gcj_kind = GC_new_kind_inner(
84 (void **)GC_gcjobjfreelist,
85 (((word)(-MARK_DESCR_OFFSET - GC_INDIR_PER_OBJ_BIAS))
89 /* Set up object kind for objects that require mark proc call. */
90 if (ignore_gcj_info) {
91 GC_gcj_debug_kind = GC_gcj_kind;
92 GC_gcjdebugobjfreelist = GC_gcjobjfreelist;
94 GC_gcjdebugobjfreelist = (ptr_t *)GC_new_free_list_inner();
95 GC_gcj_debug_kind = GC_new_kind_inner(
96 (void **)GC_gcjdebugobjfreelist,
97 GC_MAKE_PROC(mp_index,
98 1 /* allocated with debug info */),
104 void * GC_clear_stack(void *);
106 #define GENERAL_MALLOC(lb,k) \
107 GC_clear_stack(GC_generic_malloc_inner((word)lb, k))
109 #define GENERAL_MALLOC_IOP(lb,k) \
110 GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
112 /* We need a mechanism to release the lock and invoke finalizers. */
113 /* We don't really have an opportunity to do this on a rarely executed */
114 /* path on which the lock is not held. Thus we check at a */
115 /* rarely executed point at which it is safe to release the lock. */
116 /* We do this even where we could just call GC_INVOKE_FINALIZERS, */
117 /* since it's probably cheaper and certainly more uniform. */
118 /* FIXME - Consider doing the same elsewhere? */
119 static void maybe_finalize()
121 static int last_finalized_no = 0;
123 if (GC_gc_no == last_finalized_no) return;
124 if (!GC_is_initialized) return;
126 GC_INVOKE_FINALIZERS();
127 last_finalized_no = GC_gc_no;
131 /* Allocate an object, clear it, and store the pointer to the */
132 /* type structure (vtable in gcj). */
133 /* This adds a byte at the end of the object if GC_malloc would.*/
134 #ifdef THREAD_LOCAL_ALLOC
135 void * GC_core_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
137 void * GC_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
146 lg = GC_size_map[lb];
147 opp = &(GC_gcjobjfreelist[lg]);
150 if(EXPECT(op == 0, 0)) {
152 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
155 return(GC_oom_fn(lb));
159 GC_bytes_allocd += GRANULES_TO_BYTES(lg);
161 *(void **)op = ptr_to_struct_containing_descr;
162 GC_ASSERT(((void **)op)[1] == 0);
167 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
170 return(GC_oom_fn(lb));
172 *(void **)op = ptr_to_struct_containing_descr;
178 /* Similar to GC_gcj_malloc, but add debug info. This is allocated */
179 /* with GC_gcj_debug_kind. */
180 void * GC_debug_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr,
185 /* We're careful to avoid extra calls, which could */
186 /* confuse the backtrace. */
189 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
192 GC_err_printf("GC_debug_gcj_malloc(%ld, %p) returning NIL (",
193 (unsigned long)lb, ptr_to_struct_containing_descr);
195 GC_err_printf(":%d)\n", i);
196 return(GC_oom_fn(lb));
198 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
200 if (!GC_debugging_started) {
201 GC_start_debugging();
203 ADD_CALL_CHAIN(result, ra);
204 return (GC_store_debug_info(result, (word)lb, s, (word)i));
207 void * GC_gcj_malloc_ignore_off_page(size_t lb,
208 void * ptr_to_struct_containing_descr)
216 lg = GC_size_map[lb];
217 opp = &(GC_gcjobjfreelist[lg]);
219 if( (op = *opp) == 0 ) {
221 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
222 lg = GC_size_map[lb]; /* May have been uninitialized. */
225 GC_bytes_allocd += GRANULES_TO_BYTES(lg);
227 *(void **)op = ptr_to_struct_containing_descr;
232 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
234 *(void **)op = ptr_to_struct_containing_descr;
243 char GC_no_gcj_support;
245 #endif /* GC_GCJ_SUPPORT */