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Diffstat (limited to 'gc/gcj_mlc.c')
| -rw-r--r-- | gc/gcj_mlc.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/gc/gcj_mlc.c b/gc/gcj_mlc.c new file mode 100644 index 0000000..7e79521 --- /dev/null +++ b/gc/gcj_mlc.c @@ -0,0 +1,284 @@ +/* + * 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 */ |