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.
16 #include "private/gc_pmark.h" /* includes gc_priv.h */
21 * This is an allocator interface tuned for gcj (the GNU static
24 * Each allocated object has a pointer in its first word to a vtable,
25 * which for our purposes is simply a structure describing the type of
27 * This descriptor structure contains a GC marking descriptor at offset
30 * It is hoped that this interface may also be useful for other systems,
31 * possibly with some tuning of the constants. But the immediate goal
32 * is to get better gcj performance.
35 * 1) Counting on explicit initialization of this interface is OK;
36 * 2) FASTLOCK is not a significant win.
40 #include "private/dbg_mlc.h"
43 GC_INNER /* variable is also used in thread_local_alloc.c */
47 GC_bool GC_gcj_malloc_initialized = FALSE;
49 int GC_gcj_kind = 0; /* Object kind for objects with descriptors */
51 int GC_gcj_debug_kind = 0;
52 /* The kind of objects that is always marked */
53 /* with a mark proc call. */
55 GC_INNER ptr_t * GC_gcjobjfreelist = NULL;
57 STATIC ptr_t * GC_gcjdebugobjfreelist = NULL;
60 STATIC struct GC_ms_entry * GC_gcj_fake_mark_proc(word * addr,
61 struct GC_ms_entry *mark_stack_ptr,
62 struct GC_ms_entry *mark_stack_limit,
65 ABORT("No client gcj mark proc is specified");
66 return mark_stack_ptr;
69 /* Caller does not hold allocation lock. */
70 GC_API void GC_CALL GC_init_gcj_malloc(int mp_index,
71 void * /* really GC_mark_proc */mp)
73 GC_bool ignore_gcj_info;
76 if (mp == 0) /* In case GC_DS_PROC is unused. */
77 mp = (void *)(word)GC_gcj_fake_mark_proc;
79 GC_init(); /* In case it's not already done. */
81 if (GC_gcj_malloc_initialized) {
85 GC_gcj_malloc_initialized = TRUE;
86 # ifdef GC_IGNORE_GCJ_INFO
87 /* This is useful for debugging on platforms with missing getenv(). */
90 ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
92 if (GC_print_stats && ignore_gcj_info) {
93 GC_log_printf("Gcj-style type information is disabled!\n");
95 GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
96 GC_mark_procs[mp_index] = (GC_mark_proc)(word)mp;
97 if ((unsigned)mp_index >= GC_n_mark_procs)
98 ABORT("GC_init_gcj_malloc: bad index");
99 /* Set up object kind gcj-style indirect descriptor. */
100 GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
101 if (ignore_gcj_info) {
102 /* Use a simple length-based descriptor, thus forcing a fully */
103 /* conservative scan. */
104 GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
108 GC_gcj_kind = GC_new_kind_inner(
109 (void **)GC_gcjobjfreelist,
110 (((word)(-(signed_word)MARK_DESCR_OFFSET
111 - GC_INDIR_PER_OBJ_BIAS))
115 /* Set up object kind for objects that require mark proc call. */
116 if (ignore_gcj_info) {
117 GC_gcj_debug_kind = GC_gcj_kind;
118 GC_gcjdebugobjfreelist = GC_gcjobjfreelist;
120 GC_gcjdebugobjfreelist = (ptr_t *)GC_new_free_list_inner();
121 GC_gcj_debug_kind = GC_new_kind_inner(
122 (void **)GC_gcjdebugobjfreelist,
123 GC_MAKE_PROC(mp_index,
124 1 /* allocated with debug info */),
130 #define GENERAL_MALLOC_INNER(lb,k) \
131 GC_clear_stack(GC_generic_malloc_inner(lb, k))
133 #define GENERAL_MALLOC_INNER_IOP(lb,k) \
134 GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
136 /* We need a mechanism to release the lock and invoke finalizers. */
137 /* We don't really have an opportunity to do this on a rarely executed */
138 /* path on which the lock is not held. Thus we check at a */
139 /* rarely executed point at which it is safe to release the lock. */
140 /* We do this even where we could just call GC_INVOKE_FINALIZERS, */
141 /* since it's probably cheaper and certainly more uniform. */
142 /* FIXME - Consider doing the same elsewhere? */
143 static void maybe_finalize(void)
145 static word last_finalized_no = 0;
148 if (GC_gc_no == last_finalized_no) return;
149 if (!GC_is_initialized) return;
151 GC_INVOKE_FINALIZERS();
153 last_finalized_no = GC_gc_no;
156 /* Allocate an object, clear it, and store the pointer to the */
157 /* type structure (vtable in gcj). */
158 /* This adds a byte at the end of the object if GC_malloc would.*/
159 #ifdef THREAD_LOCAL_ALLOC
160 GC_INNER void * GC_core_gcj_malloc(size_t lb,
161 void * ptr_to_struct_containing_descr)
163 GC_API void * GC_CALL GC_gcj_malloc(size_t lb,
164 void * ptr_to_struct_containing_descr)
173 lg = GC_size_map[lb];
174 opp = &(GC_gcjobjfreelist[lg]);
177 if(EXPECT(op == 0, FALSE)) {
179 op = (ptr_t)GENERAL_MALLOC_INNER((word)lb, GC_gcj_kind);
181 GC_oom_func oom_fn = GC_oom_fn;
183 return((*oom_fn)(lb));
187 GC_bytes_allocd += GRANULES_TO_BYTES(lg);
189 *(void **)op = ptr_to_struct_containing_descr;
190 GC_ASSERT(((void **)op)[1] == 0);
195 op = (ptr_t)GENERAL_MALLOC_INNER((word)lb, GC_gcj_kind);
197 GC_oom_func oom_fn = GC_oom_fn;
199 return((*oom_fn)(lb));
201 *(void **)op = ptr_to_struct_containing_descr;
207 /* Similar to GC_gcj_malloc, but add debug info. This is allocated */
208 /* with GC_gcj_debug_kind. */
209 GC_API void * GC_CALL GC_debug_gcj_malloc(size_t lb,
210 void * ptr_to_struct_containing_descr, GC_EXTRA_PARAMS)
215 /* We're careful to avoid extra calls, which could */
216 /* confuse the backtrace. */
219 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
221 GC_oom_func oom_fn = GC_oom_fn;
223 GC_err_printf("GC_debug_gcj_malloc(%ld, %p) returning NULL (",
224 (unsigned long)lb, ptr_to_struct_containing_descr);
226 GC_err_printf(":%d)\n", i);
227 return((*oom_fn)(lb));
229 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
231 if (!GC_debugging_started) {
232 GC_start_debugging();
234 ADD_CALL_CHAIN(result, ra);
235 return (GC_store_debug_info(result, (word)lb, s, i));
238 /* There is no THREAD_LOCAL_ALLOC for GC_gcj_malloc_ignore_off_page(). */
239 GC_API void * GC_CALL GC_gcj_malloc_ignore_off_page(size_t lb,
240 void * ptr_to_struct_containing_descr)
248 lg = GC_size_map[lb];
249 opp = &(GC_gcjobjfreelist[lg]);
251 if( (op = *opp) == 0 ) {
253 op = (ptr_t)GENERAL_MALLOC_INNER_IOP(lb, GC_gcj_kind);
255 GC_oom_func oom_fn = GC_oom_fn;
257 return((*oom_fn)(lb));
261 GC_bytes_allocd += GRANULES_TO_BYTES(lg);
266 op = (ptr_t)GENERAL_MALLOC_INNER_IOP(lb, GC_gcj_kind);
268 GC_oom_func oom_fn = GC_oom_fn;
270 return((*oom_fn)(lb));
273 *(void **)op = ptr_to_struct_containing_descr;
278 #endif /* GC_GCJ_SUPPORT */