Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
branch: mono-1-1-13-8
Fetching contributors…

Cannot retrieve contributors at this time

322 lines (295 sloc) 9.626 kb
/*
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
*
* 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.
*
*/
/* Boehm, July 31, 1995 5:02 pm PDT */
#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) We have an ANSI conforming C compiler.
* 2) Counting on explicit initialization of this interface is OK.
* 3) FASTLOCK is not a significant win.
*/
#include "private/gc_pmark.h"
#include "gc_gcj.h"
#include "private/dbg_mlc.h"
GC_bool GC_gcj_malloc_initialized = FALSE;
int GC_gcj_kind; /* Object kind for objects with descriptors */
/* in "vtable". */
int GC_gcj_debug_kind; /* The kind of objects that is always marked */
/* with a mark proc call. */
ptr_t * GC_gcjobjfreelist;
ptr_t * GC_gcjdebugobjfreelist;
/* Caller does not hold allocation lock. */
void GC_init_gcj_malloc(int mp_index, void * /* really GC_mark_proc */mp)
{
register int i;
GC_bool ignore_gcj_info;
DCL_LOCK_STATE;
GC_init(); /* In case it's not already done. */
DISABLE_SIGNALS();
LOCK();
if (GC_gcj_malloc_initialized) {
UNLOCK();
ENABLE_SIGNALS();
return;
}
GC_gcj_malloc_initialized = TRUE;
ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
# ifdef CONDPRINT
if (GC_print_stats && ignore_gcj_info) {
GC_printf0("Gcj-style type information is disabled!\n");
}
# endif
GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
GC_mark_procs[mp_index] = (GC_mark_proc)mp;
if (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)(-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();
ENABLE_SIGNALS();
}
ptr_t GC_clear_stack();
#define GENERAL_MALLOC(lb,k) \
(GC_PTR)GC_clear_stack(GC_generic_malloc_inner((word)lb, k))
#define GENERAL_MALLOC_IOP(lb,k) \
(GC_PTR)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()
{
static int last_finalized_no = 0;
if (GC_gc_no == last_finalized_no) return;
if (!GC_is_initialized) return;
UNLOCK();
GC_INVOKE_FINALIZERS();
last_finalized_no = GC_gc_no;
LOCK();
}
/* 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.*/
void * GC_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr)
{
register ptr_t op;
register ptr_t * opp;
register word lw;
DCL_LOCK_STATE;
if( EXPECT(SMALL_OBJ(lb), 1) ) {
# ifdef MERGE_SIZES
lw = GC_size_map[lb];
# else
lw = ALIGNED_WORDS(lb);
# endif
opp = &(GC_gcjobjfreelist[lw]);
LOCK();
op = *opp;
if(EXPECT(op == 0, 0)) {
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
if (0 == op) {
UNLOCK();
return(GC_oom_fn(lb));
}
# ifdef MERGE_SIZES
lw = GC_size_map[lb]; /* May have been uninitialized. */
# endif
} else {
*opp = obj_link(op);
GC_words_allocd += lw;
}
*(void **)op = ptr_to_struct_containing_descr;
GC_ASSERT(((void **)op)[1] == 0);
UNLOCK();
} else {
LOCK();
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC((word)lb, GC_gcj_kind);
if (0 == op) {
UNLOCK();
return(GC_oom_fn(lb));
}
*(void **)op = ptr_to_struct_containing_descr;
UNLOCK();
}
return((GC_PTR) op);
}
/* Similar to GC_gcj_malloc, but add debug info. This is allocated */
/* with GC_gcj_debug_kind. */
GC_PTR GC_debug_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr,
GC_EXTRA_PARAMS)
{
GC_PTR result;
/* 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) {
UNLOCK();
GC_err_printf2("GC_debug_gcj_malloc(%ld, 0x%lx) returning NIL (",
(unsigned long) lb,
(unsigned long) ptr_to_struct_containing_descr);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return(GC_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, (word)i));
}
/* Similar to GC_gcj_malloc, but the size is in words, and we don't */
/* adjust it. The size is assumed to be such that it can be */
/* allocated as a small object. */
void * GC_gcj_fast_malloc(size_t lw, void * ptr_to_struct_containing_descr)
{
ptr_t op;
ptr_t * opp;
DCL_LOCK_STATE;
opp = &(GC_gcjobjfreelist[lw]);
LOCK();
op = *opp;
if( EXPECT(op == 0, 0) ) {
maybe_finalize();
op = (ptr_t)GC_clear_stack(
GC_generic_malloc_words_small_inner(lw, GC_gcj_kind));
if (0 == op) {
UNLOCK();
return GC_oom_fn(WORDS_TO_BYTES(lw));
}
} else {
*opp = obj_link(op);
GC_words_allocd += lw;
}
*(void **)op = ptr_to_struct_containing_descr;
UNLOCK();
return((GC_PTR) op);
}
/* And a debugging version of the above: */
void * GC_debug_gcj_fast_malloc(size_t lw,
void * ptr_to_struct_containing_descr,
GC_EXTRA_PARAMS)
{
GC_PTR result;
size_t lb = WORDS_TO_BYTES(lw);
/* We clone the code from GC_debug_gcj_malloc, so that we */
/* dont end up with extra frames on the stack, which could */
/* confuse the backtrace. */
LOCK();
maybe_finalize();
result = GC_generic_malloc_inner(lb + DEBUG_BYTES, GC_gcj_debug_kind);
if (result == 0) {
UNLOCK();
GC_err_printf2("GC_debug_gcj_fast_malloc(%ld, 0x%lx) returning NIL (",
(unsigned long) lw,
(unsigned long) ptr_to_struct_containing_descr);
GC_err_puts(s);
GC_err_printf1(":%ld)\n", (unsigned long)i);
return GC_oom_fn(WORDS_TO_BYTES(lw));
}
*((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, (word)i));
}
void * GC_gcj_malloc_ignore_off_page(size_t lb,
void * ptr_to_struct_containing_descr)
{
register ptr_t op;
register ptr_t * opp;
register word lw;
DCL_LOCK_STATE;
if( SMALL_OBJ(lb) ) {
# ifdef MERGE_SIZES
lw = GC_size_map[lb];
# else
lw = ALIGNED_WORDS(lb);
# endif
opp = &(GC_gcjobjfreelist[lw]);
LOCK();
if( (op = *opp) == 0 ) {
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
# ifdef MERGE_SIZES
lw = GC_size_map[lb]; /* May have been uninitialized. */
# endif
} else {
*opp = obj_link(op);
GC_words_allocd += lw;
}
*(void **)op = ptr_to_struct_containing_descr;
UNLOCK();
} else {
LOCK();
maybe_finalize();
op = (ptr_t)GENERAL_MALLOC_IOP(lb, GC_gcj_kind);
if (0 != op) {
*(void **)op = ptr_to_struct_containing_descr;
}
UNLOCK();
}
return((GC_PTR) op);
}
#else
char GC_no_gcj_support;
#endif /* GC_GCJ_SUPPORT */
Jump to Line
Something went wrong with that request. Please try again.