2 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
3 * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
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 */
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) We have an ANSI conforming C compiler.
37 * 2) Counting on explicit initialization of this interface is OK.
38 * 3) FASTLOCK is not a significant win.
41 #include "private/gc_pmark.h"
43 #include "private/dbg_mlc.h"
45 GC_bool GC_gcj_malloc_initialized = FALSE;
47 int GC_gcj_kind; /* Object kind for objects with descriptors */
49 int GC_gcj_debug_kind; /* The kind of objects that is always marked */
50 /* with a mark proc call. */
52 ptr_t * GC_gcjobjfreelist;
53 ptr_t * GC_gcjdebugobjfreelist;
55 /* Caller does not hold allocation lock. */
56 void GC_init_gcj_malloc(int mp_index, void * /* really GC_mark_proc */mp)
59 GC_bool ignore_gcj_info;
62 GC_init(); /* In case it's not already done. */
65 if (GC_gcj_malloc_initialized) {
70 GC_gcj_malloc_initialized = TRUE;
71 ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
73 if (GC_print_stats && ignore_gcj_info) {
74 GC_printf0("Gcj-style type information is disabled!\n");
77 GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
78 GC_mark_procs[mp_index] = (GC_mark_proc)mp;
79 if (mp_index >= GC_n_mark_procs) ABORT("GC_init_gcj_malloc: bad index");
80 /* Set up object kind gcj-style indirect descriptor. */
81 GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
82 if (ignore_gcj_info) {
83 /* Use a simple length-based descriptor, thus forcing a fully */
84 /* conservative scan. */
85 GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
89 GC_gcj_kind = GC_new_kind_inner(
90 (void **)GC_gcjobjfreelist,
91 (((word)(-MARK_DESCR_OFFSET - GC_INDIR_PER_OBJ_BIAS))
95 /* Set up object kind for objects that require mark proc call. */
96 if (ignore_gcj_info) {
97 GC_gcj_debug_kind = GC_gcj_kind;
98 GC_gcjdebugobjfreelist = GC_gcjobjfreelist;
100 GC_gcjdebugobjfreelist = (ptr_t *)GC_new_free_list_inner();
101 GC_gcj_debug_kind = GC_new_kind_inner(
102 (void **)GC_gcjdebugobjfreelist,
103 GC_MAKE_PROC(mp_index,
104 1 /* allocated with debug info */),
111 ptr_t GC_clear_stack();
113 #define GENERAL_MALLOC(lb,k) \
114 (GC_PTR)GC_clear_stack(GC_generic_malloc_inner((word)lb, k))
116 #define GENERAL_MALLOC_IOP(lb,k) \
117 (GC_PTR)GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
119 /* We need a mechanism to release the lock and invoke finalizers. */
120 /* We don't really have an opportunity to do this on a rarely executed */
121 /* path on which the lock is not held. Thus we check at a */
122 /* rarely executed point at which it is safe to release the lock. */
123 /* We do this even where we could just call GC_INVOKE_FINALIZERS, */
124 /* since it's probably cheaper and certainly more uniform. */
125 /* FIXME - Consider doing the same elsewhere? */
126 static void maybe_finalize()
128 static int last_finalized_no = 0;
130 if (GC_gc_no == last_finalized_no) return;
131 if (!GC_is_initialized) return;
133 GC_INVOKE_FINALIZERS();
134 last_finalized_no = GC_gc_no;
138 /* Allocate an object, clear it, and store the pointer to the */
139 /* type structure (vtable in gcj). */
140 /* This adds a byte at the end of the object if GC_malloc would.*/
141 void * GC_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
144 register ptr_t * opp;
148 if( EXPECT(SMALL_OBJ(lb), 1) ) {
150 lw = GC_size_map[lb];
152 lw = ALIGNED_WORDS(lb);
154 opp = &(GC_gcjobjfreelist[lw]);
157 if(EXPECT(op == 0, 0)) {
159 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
162 return(GC_oom_fn(lb));
165 lw = GC_size_map[lb]; /* May have been uninitialized. */
169 GC_words_allocd += lw;
171 *(void **)op = ptr_to_struct_containing_descr;
172 GC_ASSERT(((void **)op)[1] == 0);
177 op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
180 return(GC_oom_fn(lb));
182 *(void **)op = ptr_to_struct_containing_descr;
188 /* Similar to GC_gcj_malloc, but add debug info. This is allocated */
189 /* with GC_gcj_debug_kind. */
190 GC_PTR GC_debug_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr,
195 /* We're careful to avoid extra calls, which could */
196 /* confuse the backtrace. */
199 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
202 GC_err_printf2("GC_debug_gcj_malloc(%ld, 0x%lx) returning NIL (",
204 (unsigned long) ptr_to_struct_containing_descr);
206 GC_err_printf1(":%ld)\n", (unsigned long)i);
207 return(GC_oom_fn(lb));
209 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
211 if (!GC_debugging_started) {
212 GC_start_debugging();
214 ADD_CALL_CHAIN(result, ra);
215 return (GC_store_debug_info(result, (word)lb, s, (word)i));
218 /* Similar to GC_gcj_malloc, but the size is in words, and we don't */
219 /* adjust it. The size is assumed to be such that it can be */
220 /* allocated as a small object. */
221 void * GC_gcj_fast_malloc(size_t lw, void * ptr_to_struct_containing_descr)
227 opp = &(GC_gcjobjfreelist[lw]);
230 if( EXPECT(op == 0, 0) ) {
232 op = (ptr_t)GC_clear_stack(
233 GC_generic_malloc_words_small_inner(lw, GC_gcj_kind));
236 return GC_oom_fn(WORDS_TO_BYTES(lw));
240 GC_words_allocd += lw;
242 *(void **)op = ptr_to_struct_containing_descr;
247 /* And a debugging version of the above: */
248 void * GC_debug_gcj_fast_malloc(size_t lw,
249 void * ptr_to_struct_containing_descr,
253 size_t lb = WORDS_TO_BYTES(lw);
255 /* We clone the code from GC_debug_gcj_malloc, so that we */
256 /* dont end up with extra frames on the stack, which could */
257 /* confuse the backtrace. */
260 result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
263 GC_err_printf2("GC_debug_gcj_fast_malloc(%ld, 0x%lx) returning NIL (",
265 (unsigned long) ptr_to_struct_containing_descr);
267 GC_err_printf1(":%ld)\n", (unsigned long)i);
268 return GC_oom_fn(WORDS_TO_BYTES(lw));
270 *((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
272 if (!GC_debugging_started) {
273 GC_start_debugging();
275 ADD_CALL_CHAIN(result, ra);
276 return (GC_store_debug_info(result, (word)lb, s, (word)i));
279 void * GC_gcj_malloc_ignore_off_page(size_t lb,
280 void * ptr_to_struct_containing_descr)
283 register ptr_t * opp;
287 if( SMALL_OBJ(lb) ) {
289 lw = GC_size_map[lb];
291 lw = ALIGNED_WORDS(lb);
293 opp = &(GC_gcjobjfreelist[lw]);
295 if( (op = *opp) == 0 ) {
297 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
299 lw = GC_size_map[lb]; /* May have been uninitialized. */
303 GC_words_allocd += lw;
305 *(void **)op = ptr_to_struct_containing_descr;
310 op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
312 *(void **)op = ptr_to_struct_containing_descr;
321 char GC_no_gcj_support;
323 #endif /* GC_GCJ_SUPPORT */