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/*
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
*
* 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.
*
*/
#include "private/gc_pmark.h" /* includes gc_priv.h */
#ifdef GC_GCJ_SUPPORT
/*
* This is an allocator interface tuned for gcj (the GNU static
* java compiler).
*
* Each allocated object has a pointer in its first word to a vtable,
* which for our purposes is simply a structure describing the type of
* the object.
* This descriptor structure contains a GC marking descriptor at offset
* MARK_DESCR_OFFSET.
*
* It is hoped that this interface may also be useful for other systems,
* possibly with some tuning of the constants. But the immediate goal
* is to get better gcj performance.
*
* We assume:
* 1) Counting on explicit initialization of this interface is OK;
* 2) FASTLOCK is not a significant win.
*/
#include "gc_gcj.h"
#include "private/dbg_mlc.h"
#ifdef GC_ASSERTIONS
GC_INNER /* variable is also used in thread_local_alloc.c */
#else
STATIC
#endif
GC_bool GC_gcj_malloc_initialized = FALSE;
int GC_gcj_kind = 0; /* Object kind for objects with descriptors */
/* in "vtable". */
int GC_gcj_debug_kind = 0;
/* The kind of objects that is always marked */
/* with a mark proc call. */
GC_INNER ptr_t * GC_gcjobjfreelist = NULL;
STATIC ptr_t * GC_gcjdebugobjfreelist = NULL;
STATIC struct GC_ms_entry * GC_gcj_fake_mark_proc(word * addr GC_ATTR_UNUSED,
struct GC_ms_entry *mark_stack_ptr,
struct GC_ms_entry * mark_stack_limit GC_ATTR_UNUSED,
word env GC_ATTR_UNUSED)
{
ABORT_RET("No client gcj mark proc is specified");
return mark_stack_ptr;
}
/* Caller does not hold allocation lock. */
GC_API void GC_CALL GC_init_gcj_malloc(int mp_index,
void * /* really GC_mark_proc */mp)
{
GC_bool ignore_gcj_info;
DCL_LOCK_STATE;
if (mp == 0) /* In case GC_DS_PROC is unused. */
mp = (void *)(word)GC_gcj_fake_mark_proc;
GC_init(); /* In case it's not already done. */
LOCK();
if (GC_gcj_malloc_initialized) {
UNLOCK();
return;
}
GC_gcj_malloc_initialized = TRUE;
# ifdef GC_IGNORE_GCJ_INFO
/* This is useful for debugging on platforms with missing getenv(). */
ignore_gcj_info = 1;
# else
ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
# endif
if (ignore_gcj_info) {
GC_COND_LOG_PRINTF("Gcj-style type information is disabled!\n");
}
GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
GC_mark_procs[mp_index] = (GC_mark_proc)(word)mp;
if ((unsigned)mp_index >= GC_n_mark_procs)
ABORT("GC_init_gcj_malloc: bad index");
/* Set up object kind gcj-style indirect descriptor. */
GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
if (ignore_gcj_info) {
/* Use a simple length-based descriptor, thus forcing a fully */
/* conservative scan. */
GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
(0 | GC_DS_LENGTH),
TRUE, TRUE);
} else {
GC_gcj_kind = GC_new_kind_inner(
(void **)GC_gcjobjfreelist,
(((word)(-(signed_word)MARK_DESCR_OFFSET
- GC_INDIR_PER_OBJ_BIAS))
| GC_DS_PER_OBJECT),
FALSE, TRUE);
}
/* Set up object kind for objects that require mark proc call. */
if (ignore_gcj_info) {
GC_gcj_debug_kind = GC_gcj_kind;
GC_gcjdebugobjfreelist = GC_gcjobjfreelist;
} else {
GC_gcjdebugobjfreelist = (ptr_t *)GC_new_free_list_inner();
GC_gcj_debug_kind = GC_new_kind_inner(
(void **)GC_gcjdebugobjfreelist,
GC_MAKE_PROC(mp_index,
1 /* allocated with debug info */),
FALSE, TRUE);
}
UNLOCK();
}
#define GENERAL_MALLOC_INNER(lb,k) \
GC_clear_stack(GC_generic_malloc_inner(lb, k))
#define GENERAL_MALLOC_INNER_IOP(lb,k) \
GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
/* We need a mechanism to release the lock and invoke finalizers. */
/* We don't really have an opportunity to do this on a rarely executed */
/* path on which the lock is not held. Thus we check at a */
/* rarely executed point at which it is safe to release the lock. */
/* We do this even where we could just call GC_INVOKE_FINALIZERS, */
/* since it's probably cheaper and certainly more uniform. */
/* FIXME - Consider doing the same elsewhere? */
static void maybe_finalize(void)
{
static word last_finalized_no = 0;
DCL_LOCK_STATE;
if (GC_gc_no == last_finalized_no ||
!EXPECT(GC_is_initialized, TRUE)) return;
UNLOCK();
GC_INVOKE_FINALIZERS();
LOCK();
last_finalized_no = GC_gc_no;
}
/* Allocate an object, clear it, and store the pointer to the */
/* type structure (vtable in gcj). */
/* This adds a byte at the end of the object if GC_malloc would.*/
#ifdef THREAD_LOCAL_ALLOC
GC_INNER void * GC_core_gcj_malloc(size_t lb,
void * ptr_to_struct_containing_descr)
#else
GC_API void * GC_CALL GC_gcj_malloc(size_t lb,
void * ptr_to_struct_containing_descr)
#endif
{
ptr_t op;
ptr_t * opp;
word lg;
DCL_LOCK_STATE;
GC_DBG_COLLECT_AT_MALLOC(lb);
if(SMALL_OBJ(lb)) {
lg = GC_size_map[lb];
opp = &(GC_gcjobjfreelist[lg]);
LOCK();
op = *opp;
if(EXPECT(op == 0, FALSE)) {
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC_INNER((word)lb, GC_gcj_kind);
if (0 == op) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
return((*oom_fn)(lb));
}
} else {
*opp = obj_link(op);
GC_bytes_allocd += GRANULES_TO_BYTES(lg);
}
*(void **)op = ptr_to_struct_containing_descr;
GC_ASSERT(((void **)op)[1] == 0);
UNLOCK();
} else {
LOCK();
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC_INNER((word)lb, GC_gcj_kind);
if (0 == op) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
return((*oom_fn)(lb));
}
*(void **)op = ptr_to_struct_containing_descr;
UNLOCK();
}
return((void *) op);
}
/* Similar to GC_gcj_malloc, but add debug info. This is allocated */
/* with GC_gcj_debug_kind. */
GC_API void * GC_CALL GC_debug_gcj_malloc(size_t lb,
void * ptr_to_struct_containing_descr, GC_EXTRA_PARAMS)
{
void * result;
DCL_LOCK_STATE;
/* We're careful to avoid extra calls, which could */
/* confuse the backtrace. */
LOCK();
maybe_finalize();
result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
if (result == 0) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
GC_err_printf("GC_debug_gcj_malloc(%lu, %p) returning NULL (%s:%d)\n",
(unsigned long)lb, ptr_to_struct_containing_descr, s, i);
return((*oom_fn)(lb));
}
*((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
UNLOCK();
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
/* There is no THREAD_LOCAL_ALLOC for GC_gcj_malloc_ignore_off_page(). */
GC_API void * GC_CALL GC_gcj_malloc_ignore_off_page(size_t lb,
void * ptr_to_struct_containing_descr)
{
ptr_t op;
ptr_t * opp;
word lg;
DCL_LOCK_STATE;
GC_DBG_COLLECT_AT_MALLOC(lb);
if(SMALL_OBJ(lb)) {
lg = GC_size_map[lb];
opp = &(GC_gcjobjfreelist[lg]);
LOCK();
op = *opp;
if (EXPECT(0 == op, FALSE)) {
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC_INNER_IOP(lb, GC_gcj_kind);
if (0 == op) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
return((*oom_fn)(lb));
}
} else {
*opp = obj_link(op);
GC_bytes_allocd += GRANULES_TO_BYTES(lg);
}
} else {
LOCK();
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC_INNER_IOP(lb, GC_gcj_kind);
if (0 == op) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
return((*oom_fn)(lb));
}
}
*(void **)op = ptr_to_struct_containing_descr;
UNLOCK();
return((void *) op);
}
#endif /* GC_GCJ_SUPPORT */