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-rw-r--r--gc/gcj_mlc.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/gc/gcj_mlc.c b/gc/gcj_mlc.c
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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 */
+
+#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;
+ 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;
+ 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_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
+ if (GC_gcjobjfreelist == 0) ABORT("Couldn't allocate GC_gcjobjfreelist");
+ BZERO(GC_gcjobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
+ GC_gcj_kind = GC_n_kinds++;
+ GC_obj_kinds[GC_gcj_kind].ok_freelist = GC_gcjobjfreelist;
+ GC_obj_kinds[GC_gcj_kind].ok_reclaim_list = 0;
+ GC_obj_kinds[GC_gcj_kind].ok_descriptor =
+ (((word)(-MARK_DESCR_OFFSET - GC_INDIR_PER_OBJ_BIAS)) | GC_DS_PER_OBJECT);
+ GC_obj_kinds[GC_gcj_kind].ok_relocate_descr = FALSE;
+ GC_obj_kinds[GC_gcj_kind].ok_init = TRUE;
+ /* Set up object kind for objects that require mark proc call. */
+ GC_gcjdebugobjfreelist = (ptr_t *)
+ GC_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
+ if (GC_gcjdebugobjfreelist == 0)
+ ABORT("Couldn't allocate GC_gcjdebugobjfreelist");
+ BZERO(GC_gcjdebugobjfreelist, (MAXOBJSZ+1)*sizeof(ptr_t));
+ GC_gcj_debug_kind = GC_n_kinds++;
+ GC_obj_kinds[GC_gcj_debug_kind].ok_freelist = GC_gcjdebugobjfreelist;
+ GC_obj_kinds[GC_gcj_debug_kind].ok_reclaim_list = 0;
+ GC_obj_kinds[GC_gcj_debug_kind].ok_descriptor =
+ GC_MAKE_PROC(mp_index, 1 /* allocated with debug info */);
+ GC_obj_kinds[GC_gcj_debug_kind].ok_relocate_descr = FALSE;
+ GC_obj_kinds[GC_gcj_debug_kind].ok_init = 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))
+
+/* 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)) {
+ 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;
+ UNLOCK();
+ } else {
+ LOCK();
+ 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 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();
+ 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) ) {
+ 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();
+ 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 ) {
+ 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 {
+ 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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