278 lines
9.4 KiB
C
278 lines
9.4 KiB
C
/*
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
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* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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#include "private/gc_pmark.h" /* includes gc_priv.h */
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#ifdef GC_GCJ_SUPPORT
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/*
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* This is an allocator interface tuned for gcj (the GNU static
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* java compiler).
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*
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* Each allocated object has a pointer in its first word to a vtable,
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* which for our purposes is simply a structure describing the type of
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* the object.
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* This descriptor structure contains a GC marking descriptor at offset
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* MARK_DESCR_OFFSET.
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*
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* It is hoped that this interface may also be useful for other systems,
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* possibly with some tuning of the constants. But the immediate goal
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* is to get better gcj performance.
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*
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* We assume:
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* 1) Counting on explicit initialization of this interface is OK;
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* 2) FASTLOCK is not a significant win.
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*/
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#include "gc_gcj.h"
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#include "private/dbg_mlc.h"
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#ifdef GC_ASSERTIONS
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GC_INNER /* variable is also used in thread_local_alloc.c */
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#else
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STATIC
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#endif
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GC_bool GC_gcj_malloc_initialized = FALSE;
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int GC_gcj_kind = 0; /* Object kind for objects with descriptors */
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/* in "vtable". */
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int GC_gcj_debug_kind = 0;
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/* The kind of objects that is always marked */
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/* with a mark proc call. */
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GC_INNER ptr_t * GC_gcjobjfreelist = NULL;
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STATIC struct GC_ms_entry * GC_gcj_fake_mark_proc(word * addr GC_ATTR_UNUSED,
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struct GC_ms_entry *mark_stack_ptr,
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struct GC_ms_entry * mark_stack_limit GC_ATTR_UNUSED,
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word env GC_ATTR_UNUSED)
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{
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ABORT_RET("No client gcj mark proc is specified");
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return mark_stack_ptr;
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}
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/* Caller does not hold allocation lock. */
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GC_API void GC_CALL GC_init_gcj_malloc(int mp_index,
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void * /* really GC_mark_proc */mp)
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{
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GC_bool ignore_gcj_info;
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DCL_LOCK_STATE;
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if (mp == 0) /* In case GC_DS_PROC is unused. */
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mp = (void *)(word)GC_gcj_fake_mark_proc;
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GC_init(); /* In case it's not already done. */
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LOCK();
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if (GC_gcj_malloc_initialized) {
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UNLOCK();
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return;
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}
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GC_gcj_malloc_initialized = TRUE;
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# ifdef GC_IGNORE_GCJ_INFO
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/* This is useful for debugging on platforms with missing getenv(). */
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ignore_gcj_info = 1;
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# else
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ignore_gcj_info = (0 != GETENV("GC_IGNORE_GCJ_INFO"));
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# endif
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if (ignore_gcj_info) {
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GC_COND_LOG_PRINTF("Gcj-style type information is disabled!\n");
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}
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GC_ASSERT(GC_mark_procs[mp_index] == (GC_mark_proc)0); /* unused */
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GC_mark_procs[mp_index] = (GC_mark_proc)(word)mp;
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if ((unsigned)mp_index >= GC_n_mark_procs)
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ABORT("GC_init_gcj_malloc: bad index");
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/* Set up object kind gcj-style indirect descriptor. */
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GC_gcjobjfreelist = (ptr_t *)GC_new_free_list_inner();
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if (ignore_gcj_info) {
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/* Use a simple length-based descriptor, thus forcing a fully */
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/* conservative scan. */
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GC_gcj_kind = GC_new_kind_inner((void **)GC_gcjobjfreelist,
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/* 0 | */ GC_DS_LENGTH,
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TRUE, TRUE);
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} else {
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GC_gcj_kind = GC_new_kind_inner(
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(void **)GC_gcjobjfreelist,
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(((word)(-(signed_word)MARK_DESCR_OFFSET
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- GC_INDIR_PER_OBJ_BIAS))
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| GC_DS_PER_OBJECT),
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FALSE, TRUE);
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}
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/* Set up object kind for objects that require mark proc call. */
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if (ignore_gcj_info) {
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GC_gcj_debug_kind = GC_gcj_kind;
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} else {
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GC_gcj_debug_kind = GC_new_kind_inner(GC_new_free_list_inner(),
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GC_MAKE_PROC(mp_index,
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1 /* allocated with debug info */),
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FALSE, TRUE);
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}
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UNLOCK();
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}
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#define GENERAL_MALLOC_INNER(lb,k) \
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GC_clear_stack(GC_generic_malloc_inner(lb, k))
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#define GENERAL_MALLOC_INNER_IOP(lb,k) \
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GC_clear_stack(GC_generic_malloc_inner_ignore_off_page(lb, k))
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/* We need a mechanism to release the lock and invoke finalizers. */
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/* We don't really have an opportunity to do this on a rarely executed */
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/* path on which the lock is not held. Thus we check at a */
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/* rarely executed point at which it is safe to release the lock. */
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/* We do this even where we could just call GC_INVOKE_FINALIZERS, */
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/* since it's probably cheaper and certainly more uniform. */
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/* FIXME - Consider doing the same elsewhere? */
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static void maybe_finalize(void)
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{
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static word last_finalized_no = 0;
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DCL_LOCK_STATE;
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if (GC_gc_no == last_finalized_no ||
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!EXPECT(GC_is_initialized, TRUE)) return;
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UNLOCK();
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GC_INVOKE_FINALIZERS();
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LOCK();
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last_finalized_no = GC_gc_no;
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}
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/* Allocate an object, clear it, and store the pointer to the */
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/* type structure (vtable in gcj). */
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/* This adds a byte at the end of the object if GC_malloc would.*/
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#if !IL2CPP_ENABLE_WRITE_BARRIER_VALIDATION
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#ifdef THREAD_LOCAL_ALLOC
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GC_INNER void * GC_core_gcj_malloc(size_t lb,
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void * ptr_to_struct_containing_descr)
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#else
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GC_API GC_ATTR_MALLOC void * GC_CALL GC_gcj_malloc(size_t lb,
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void * ptr_to_struct_containing_descr)
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#endif
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{
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ptr_t op;
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DCL_LOCK_STATE;
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GC_DBG_COLLECT_AT_MALLOC(lb);
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if(SMALL_OBJ(lb)) {
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word lg;
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LOCK();
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lg = GC_size_map[lb];
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op = GC_gcjobjfreelist[lg];
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if(EXPECT(0 == op, FALSE)) {
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maybe_finalize();
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op = (ptr_t)GENERAL_MALLOC_INNER((word)lb, GC_gcj_kind);
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if (0 == op) {
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GC_oom_func oom_fn = GC_oom_fn;
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UNLOCK();
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return((*oom_fn)(lb));
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}
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} else {
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GC_gcjobjfreelist[lg] = (ptr_t)obj_link(op);
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GC_bytes_allocd += GRANULES_TO_BYTES((word)lg);
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}
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GC_ASSERT(((void **)op)[1] == 0);
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} else {
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LOCK();
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maybe_finalize();
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op = (ptr_t)GENERAL_MALLOC_INNER((word)lb, GC_gcj_kind);
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if (0 == op) {
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GC_oom_func oom_fn = GC_oom_fn;
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UNLOCK();
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return((*oom_fn)(lb));
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}
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}
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*(void **)op = ptr_to_struct_containing_descr;
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UNLOCK();
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GC_dirty(op);
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return((void *) op);
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}
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#endif
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/* Similar to GC_gcj_malloc, but add debug info. This is allocated */
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/* with GC_gcj_debug_kind. */
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GC_API GC_ATTR_MALLOC void * GC_CALL GC_debug_gcj_malloc(size_t lb,
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void * ptr_to_struct_containing_descr, GC_EXTRA_PARAMS)
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{
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void * result;
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DCL_LOCK_STATE;
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/* We're careful to avoid extra calls, which could */
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/* confuse the backtrace. */
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LOCK();
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maybe_finalize();
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result = GC_generic_malloc_inner(SIZET_SAT_ADD(lb, DEBUG_BYTES),
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GC_gcj_debug_kind);
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if (result == 0) {
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GC_oom_func oom_fn = GC_oom_fn;
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UNLOCK();
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GC_err_printf("GC_debug_gcj_malloc(%lu, %p) returning NULL (%s:%d)\n",
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(unsigned long)lb, ptr_to_struct_containing_descr, s, i);
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return((*oom_fn)(lb));
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}
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*((void **)((ptr_t)result + sizeof(oh))) = ptr_to_struct_containing_descr;
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if (!GC_debugging_started) {
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GC_start_debugging_inner();
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}
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ADD_CALL_CHAIN(result, ra);
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result = GC_store_debug_info_inner(result, (word)lb, s, i);
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UNLOCK();
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GC_dirty(result);
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return result;
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}
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/* There is no THREAD_LOCAL_ALLOC for GC_gcj_malloc_ignore_off_page(). */
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GC_API GC_ATTR_MALLOC void * GC_CALL GC_gcj_malloc_ignore_off_page(size_t lb,
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void * ptr_to_struct_containing_descr)
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{
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ptr_t op;
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DCL_LOCK_STATE;
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GC_DBG_COLLECT_AT_MALLOC(lb);
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if(SMALL_OBJ(lb)) {
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word lg;
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LOCK();
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lg = GC_size_map[lb];
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op = GC_gcjobjfreelist[lg];
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if (EXPECT(0 == op, FALSE)) {
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maybe_finalize();
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op = (ptr_t)GENERAL_MALLOC_INNER_IOP(lb, GC_gcj_kind);
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if (0 == op) {
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GC_oom_func oom_fn = GC_oom_fn;
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UNLOCK();
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return((*oom_fn)(lb));
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}
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} else {
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GC_gcjobjfreelist[lg] = (ptr_t)obj_link(op);
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GC_bytes_allocd += GRANULES_TO_BYTES((word)lg);
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}
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} else {
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LOCK();
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maybe_finalize();
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op = (ptr_t)GENERAL_MALLOC_INNER_IOP(lb, GC_gcj_kind);
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if (0 == op) {
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GC_oom_func oom_fn = GC_oom_fn;
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UNLOCK();
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return((*oom_fn)(lb));
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}
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}
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*(void **)op = ptr_to_struct_containing_descr;
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UNLOCK();
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GC_dirty(op);
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return((void *) op);
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}
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#endif /* GC_GCJ_SUPPORT */
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