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gcj_mlc.c
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/
gcj_mlc.c
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/*
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
* Copyright (c) 2008-2022 Ivan Maidanski
*
* 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: counting on explicit initialization of this interface is OK.
*/
#include "gc/gc_gcj.h"
#include "private/dbg_mlc.h"
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. */
STATIC struct GC_ms_entry *GC_CALLBACK GC_gcj_fake_mark_proc(word *addr,
struct GC_ms_entry *mark_stack_top,
struct GC_ms_entry * mark_stack_limit, word env)
{
UNUSED_ARG(addr);
UNUSED_ARG(mark_stack_limit);
UNUSED_ARG(env);
# if defined(FUNCPTR_IS_WORD) && defined(CPPCHECK)
GC_noop1((word)&GC_init_gcj_malloc);
# endif
ABORT_RET("No client gcj mark proc is specified");
return mark_stack_top;
}
#ifdef FUNCPTR_IS_WORD
GC_API void GC_CALL GC_init_gcj_malloc(int mp_index, void *mp)
{
GC_init_gcj_malloc_mp((unsigned)mp_index, (GC_mark_proc)(word)mp);
}
#endif /* FUNCPTR_IS_WORD */
GC_API void GC_CALL GC_init_gcj_malloc_mp(unsigned mp_index, GC_mark_proc mp)
{
# ifndef GC_IGNORE_GCJ_INFO
GC_bool ignore_gcj_info;
# endif
if (mp == 0) /* In case GC_DS_PROC is unused. */
mp = GC_gcj_fake_mark_proc;
GC_init(); /* In case it's not already done. */
LOCK();
if (GC_gcjobjfreelist != NULL) {
/* Already initialized. */
UNLOCK();
return;
}
# ifdef GC_IGNORE_GCJ_INFO
/* This is useful for debugging on platforms with missing getenv(). */
# define ignore_gcj_info TRUE
# 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] = mp;
if (mp_index >= GC_n_mark_procs)
ABORT("GC_init_gcj_malloc_mp: 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 = (int)GC_new_kind_inner((void **)GC_gcjobjfreelist,
/* 0 | */ GC_DS_LENGTH,
TRUE, TRUE);
GC_gcj_debug_kind = GC_gcj_kind;
} else {
GC_gcj_kind = (int)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. */
GC_gcj_debug_kind = (int)GC_new_kind_inner(GC_new_free_list_inner(),
GC_MAKE_PROC(mp_index,
1 /* allocated with debug info */),
FALSE, TRUE);
}
UNLOCK();
# undef ignore_gcj_info
}
/* A mechanism to release the allocator lock and invoke finalizers. */
/* We don't really have an opportunity to do this on a rarely executed */
/* path on which the allocator lock is not held. Thus we check at */
/* a rarely executed point at which it is safe to release the allocator */
/* lock; we do this even where we could just call GC_INVOKE_FINALIZERS, */
/* since it is probably cheaper and certainly more uniform. */
/* TODO: Consider doing the same elsewhere? */
static void maybe_finalize(void)
{
static word last_finalized_no = 0;
GC_ASSERT(I_HOLD_LOCK());
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
#else
STATIC
#endif
void * GC_core_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr,
unsigned flags)
{
ptr_t op;
size_t lg;
GC_DBG_COLLECT_AT_MALLOC(lb);
LOCK();
if (SMALL_OBJ(lb) && (op = GC_gcjobjfreelist[lg = GC_size_map[lb]],
EXPECT(op != NULL, TRUE))) {
GC_gcjobjfreelist[lg] = (ptr_t)obj_link(op);
GC_bytes_allocd += GRANULES_TO_BYTES((word)lg);
GC_ASSERT(NULL == ((void **)op)[1]);
} else {
maybe_finalize();
op = (ptr_t)GC_generic_malloc_inner(lb, GC_gcj_kind, flags);
if (NULL == op) {
GC_oom_func oom_fn = GC_oom_fn;
UNLOCK();
return (*oom_fn)(lb);
}
}
*(void **)op = ptr_to_struct_containing_descr;
UNLOCK();
GC_dirty(op);
REACHABLE_AFTER_DIRTY(ptr_to_struct_containing_descr);
return GC_clear_stack(op);
}
#ifndef THREAD_LOCAL_ALLOC
GC_API GC_ATTR_MALLOC void * GC_CALL GC_gcj_malloc(size_t lb,
void * ptr_to_struct_containing_descr)
{
return GC_core_gcj_malloc(lb, ptr_to_struct_containing_descr, 0);
}
#endif /* !THREAD_LOCAL_ALLOC */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_gcj_malloc_ignore_off_page(size_t lb,
void * ptr_to_struct_containing_descr)
{
return GC_core_gcj_malloc(lb, ptr_to_struct_containing_descr,
IGNORE_OFF_PAGE);
}
/* Similar to GC_gcj_malloc, but add debug info. This is allocated */
/* with GC_gcj_debug_kind. */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_debug_gcj_malloc(size_t lb,
void * ptr_to_struct_containing_descr, GC_EXTRA_PARAMS)
{
void *base, *result;
/* We're careful to avoid extra calls, which could */
/* confuse the backtrace. */
LOCK();
maybe_finalize();
base = GC_generic_malloc_inner(SIZET_SAT_ADD(lb, DEBUG_BYTES),
GC_gcj_debug_kind, 0 /* flags */);
if (NULL == base) {
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)base + sizeof(oh))) = ptr_to_struct_containing_descr;
if (!GC_debugging_started) {
GC_start_debugging_inner();
}
result = GC_store_debug_info_inner(base, (word)lb, s, i);
ADD_CALL_CHAIN(base, ra);
UNLOCK();
GC_dirty(result);
REACHABLE_AFTER_DIRTY(ptr_to_struct_containing_descr);
return result;
}
#endif /* GC_GCJ_SUPPORT */