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 */
17 #include "private/gc_pmark.h" /* includes gc_priv.h */
22 * This is an allocator interface tuned for gcj (the GNU static
25 * Each allocated object has a pointer in its first word to a vtable,
26 * which for our purposes is simply a structure describing the type of
28 * This descriptor structure contains a GC marking descriptor at offset
31 * It is hoped that this interface may also be useful for other systems,
32 * possibly with some tuning of the constants. But the immediate goal
33 * is to get better gcj performance.
36 * 1) Counting on explicit initialization of this interface is OK;
37 * 2) FASTLOCK is not a significant win.
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 GC_API void GC_CALL GC_init_gcj_malloc(int mp_index,
55 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)(word)mp;
73 if ((unsigned)mp_index >= GC_n_mark_procs)
74 ABORT("GC_init_gcj_malloc: bad index");
75 /* Set up object kind gcj-style indirect descriptor. */
76 GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
77 if (ignore_gcj_info) {
78 /* Use a simple length-based descriptor, thus forcing a fully */
79 /* conservative scan. */
80 GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
84 GC_gcj_kind = GC_new_kind_inner(
85 (void **)GC_gcjobjfreelist,
86 (((word)(-(signed_word)MARK_DESCR_OFFSET
87 - GC_INDIR_PER_OBJ_BIAS))
91 /* Set up object kind for objects that require mark proc call. */
92 if (ignore_gcj_info) {
93 GC_gcj_debug_kind = GC_gcj_kind;
94 GC_gcjdebugobjfreelist = GC_gcjobjfreelist;
96 GC_gcjdebugobjfreelist = (ptr_t *)GC_new_free_list_inner();
97 GC_gcj_debug_kind = GC_new_kind_inner(
98 (void **)GC_gcjdebugobjfreelist,
99 GC_MAKE_PROC(mp_index,
100 1 /* allocated with debug info */),
106 void * GC_clear_stack(void *);
108 #define GENERAL_MALLOC(lb,k) \
109 GC_clear_stack(GC_generic_malloc_inner((word)lb, k))
111 #define GENERAL_MALLOC_IOP(lb,k) \
112 GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
114 /* We need a mechanism to release the lock and invoke finalizers. */
115 /* We don't really have an opportunity to do this on a rarely executed */
116 /* path on which the lock is not held. Thus we check at a */
117 /* rarely executed point at which it is safe to release the lock. */
118 /* We do this even where we could just call GC_INVOKE_FINALIZERS, */
119 /* since it's probably cheaper and certainly more uniform. */
120 /* FIXME - Consider doing the same elsewhere? */
121 static void maybe_finalize(void)
123 static word last_finalized_no = 0;
125 if (GC_gc_no == last_finalized_no) return;
126 if (!GC_is_initialized) return;
128 GC_INVOKE_FINALIZERS();
129 last_finalized_no = GC_gc_no;
133 /* Allocate an object, clear it, and store the pointer to the */
134 /* type structure (vtable in gcj). */
135 /* This adds a byte at the end of the object if GC_malloc would.*/
136 #ifdef THREAD_LOCAL_ALLOC
137 void * GC_core_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
139 GC_API void * GC_CALL GC_gcj_malloc(size_t lb,
140 void * ptr_to_struct_containing_descr)
149 lg = GC_size_map[lb];
150 opp = &(GC_gcjobjfreelist[lg]);
153 if(EXPECT(op == 0, 0)) {
155 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
158 return(GC_oom_fn(lb));
162 GC_bytes_allocd += GRANULES_TO_BYTES(lg);
164 *(void **)op = ptr_to_struct_containing_descr;
165 GC_ASSERT(((void **)op)[1] == 0);
170 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
173 return(GC_oom_fn(lb));
175 *(void **)op = ptr_to_struct_containing_descr;
181 void GC_start_debugging(void);
183 /* Similar to GC_gcj_malloc, but add debug info. This is allocated */
184 /* with GC_gcj_debug_kind. */
185 GC_API void * GC_CALL GC_debug_gcj_malloc(size_t lb,
186 void * ptr_to_struct_containing_descr, GC_EXTRA_PARAMS)
190 /* We're careful to avoid extra calls, which could */
191 /* confuse the backtrace. */
194 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
197 GC_err_printf("GC_debug_gcj_malloc(%ld, %p) returning NIL (",
198 (unsigned long)lb, ptr_to_struct_containing_descr);
200 GC_err_printf(":%d)\n", i);
201 return(GC_oom_fn(lb));
203 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
205 if (!GC_debugging_started) {
206 GC_start_debugging();
208 ADD_CALL_CHAIN(result, ra);
209 return (GC_store_debug_info(result, (word)lb, s, (word)i));
212 /* There is no THREAD_LOCAL_ALLOC for GC_gcj_malloc_ignore_off_page(). */
213 GC_API void * GC_CALL GC_gcj_malloc_ignore_off_page(size_t lb,
214 void * ptr_to_struct_containing_descr)
222 lg = GC_size_map[lb];
223 opp = &(GC_gcjobjfreelist[lg]);
225 if( (op = *opp) == 0 ) {
227 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
230 return(GC_oom_fn(lb));
234 GC_bytes_allocd += GRANULES_TO_BYTES(lg);
239 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
242 return(GC_oom_fn(lb));
245 *(void **)op = ptr_to_struct_containing_descr;
253 /* ANSI C doesn't allow translation units to be empty. */
255 #endif /* GC_GCJ_SUPPORT */