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+/*
+ * 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 */
+
+/*
+ * 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"
+
+#ifdef GC_GCJ_SUPPORT
+
+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 */
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