=================================================================== RCS file: /home/cvs/OpenXM_contrib/gc/Attic/dbg_mlc.c,v retrieving revision 1.1.1.1 retrieving revision 1.1.1.3 diff -u -p -r1.1.1.1 -r1.1.1.3 --- OpenXM_contrib/gc/Attic/dbg_mlc.c 1999/11/27 10:58:32 1.1.1.1 +++ OpenXM_contrib/gc/Attic/dbg_mlc.c 2000/12/01 14:48:25 1.1.1.3 @@ -2,6 +2,7 @@ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. * Copyright (c) 1997 by Silicon Graphics. 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. @@ -12,54 +13,15 @@ * provided the above notices are retained, and a notice that the code was * modified is included with the above copyright notice. */ -/* Boehm, October 9, 1995 1:16 pm PDT */ -# include "gc_priv.h" +#include "dbg_mlc.h" + void GC_default_print_heap_obj_proc(); GC_API void GC_register_finalizer_no_order GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, GC_finalization_proc *ofn, GC_PTR *ocd)); -/* Do we want to and know how to save the call stack at the time of */ -/* an allocation? How much space do we want to use in each object? */ -# define START_FLAG ((word)0xfedcedcb) -# define END_FLAG ((word)0xbcdecdef) - /* Stored both one past the end of user object, and one before */ - /* the end of the object as seen by the allocator. */ - - -/* Object header */ -typedef struct { - char * oh_string; /* object descriptor string */ - word oh_int; /* object descriptor integers */ -# ifdef NEED_CALLINFO - struct callinfo oh_ci[NFRAMES]; -# endif - word oh_sz; /* Original malloc arg. */ - word oh_sf; /* start flag */ -} oh; -/* The size of the above structure is assumed not to dealign things, */ -/* and to be a multiple of the word length. */ - -#define DEBUG_BYTES (sizeof (oh) + sizeof (word)) -#undef ROUNDED_UP_WORDS -#define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1) - 1) - - -#ifdef SAVE_CALL_CHAIN -# define ADD_CALL_CHAIN(base, ra) GC_save_callers(((oh *)(base)) -> oh_ci) -# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci) -#else -# ifdef GC_ADD_CALLER -# define ADD_CALL_CHAIN(base, ra) ((oh *)(base)) -> oh_ci[0].ci_pc = (ra) -# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci) -# else -# define ADD_CALL_CHAIN(base, ra) -# define PRINT_CALL_CHAIN(base) -# endif -#endif - /* Check whether object with base pointer p has debugging info */ /* p is assumed to point to a legitimate object in our part */ /* of the heap. */ @@ -85,6 +47,146 @@ ptr_t p; return(FALSE); } +#ifdef KEEP_BACK_PTRS + /* Store back pointer to source in dest, if that appears to be possible. */ + /* This is not completely safe, since we may mistakenly conclude that */ + /* dest has a debugging wrapper. But the error probability is very */ + /* small, and this shouldn't be used in production code. */ + /* We assume that dest is the real base pointer. Source will usually */ + /* be a pointer to the interior of an object. */ + void GC_store_back_pointer(ptr_t source, ptr_t dest) + { + if (GC_has_debug_info(dest)) { + ((oh *)dest) -> oh_back_ptr = (ptr_t)HIDE_POINTER(source); + } + } + + void GC_marked_for_finalization(ptr_t dest) { + GC_store_back_pointer(MARKED_FOR_FINALIZATION, dest); + } + + /* Store information about the object referencing dest in *base_p */ + /* and *offset_p. */ + /* source is root ==> *base_p = address, *offset_p = 0 */ + /* source is heap object ==> *base_p != 0, *offset_p = offset */ + /* Returns 1 on success, 0 if source couldn't be determined. */ + /* Dest can be any address within a heap object. */ + GC_ref_kind GC_get_back_ptr_info(void *dest, void **base_p, size_t *offset_p) + { + oh * hdr = (oh *)GC_base(dest); + ptr_t bp; + ptr_t bp_base; + if (!GC_has_debug_info((ptr_t) hdr)) return GC_NO_SPACE; + bp = hdr -> oh_back_ptr; + if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD; + if (MARKED_FROM_REGISTER == bp) return GC_REFD_FROM_REG; + if (0 == bp) return GC_UNREFERENCED; + bp = REVEAL_POINTER(bp); + bp_base = GC_base(bp); + if (0 == bp_base) { + *base_p = bp; + *offset_p = 0; + return GC_REFD_FROM_ROOT; + } else { + if (GC_has_debug_info(bp_base)) bp_base += sizeof(oh); + *base_p = bp_base; + *offset_p = bp - bp_base; + return GC_REFD_FROM_HEAP; + } + } + + /* Generate a random heap address. */ + /* The resulting address is in the heap, but */ + /* not necessarily inside a valid object. */ + void *GC_generate_random_heap_address(void) + { + int i; + int heap_offset = random() % GC_heapsize; + for (i = 0; i < GC_n_heap_sects; ++ i) { + int size = GC_heap_sects[i].hs_bytes; + if (heap_offset < size) { + return GC_heap_sects[i].hs_start + heap_offset; + } else { + heap_offset -= size; + } + } + ABORT("GC_generate_random_heap_address: size inconsistency"); + /*NOTREACHED*/ + return 0; + } + + /* Generate a random address inside a valid marked heap object. */ + void *GC_generate_random_valid_address(void) + { + ptr_t result; + ptr_t base; + for (;;) { + result = GC_generate_random_heap_address(); + base = GC_base(result); + if (0 == base) continue; + if (!GC_is_marked(base)) continue; + return result; + } + } + + /* Print back trace for p */ + void GC_print_backtrace(void *p) + { + void *current = p; + int i; + GC_ref_kind source; + size_t offset; + void *base; + + GC_print_heap_obj(GC_base(current)); + GC_err_printf0("\n"); + for (i = 0; ; ++i) { + source = GC_get_back_ptr_info(current, &base, &offset); + if (GC_UNREFERENCED == source) { + GC_err_printf0("Reference could not be found\n"); + goto out; + } + if (GC_NO_SPACE == source) { + GC_err_printf0("No debug info in object: Can't find reference\n"); + goto out; + } + GC_err_printf1("Reachable via %d levels of pointers from ", + (unsigned long)i); + switch(source) { + case GC_REFD_FROM_ROOT: + GC_err_printf1("root at 0x%lx\n", (unsigned long)base); + goto out; + case GC_REFD_FROM_REG: + GC_err_printf0("root in register\n"); + goto out; + case GC_FINALIZER_REFD: + GC_err_printf0("list of finalizable objects\n"); + goto out; + case GC_REFD_FROM_HEAP: + GC_err_printf1("offset %ld in object:\n", (unsigned long)offset); + /* Take GC_base(base) to get real base, i.e. header. */ + GC_print_heap_obj(GC_base(base)); + GC_err_printf0("\n"); + break; + } + current = base; + } + out:; + } + + /* Force a garbage collection and generate a backtrace from a */ + /* random heap address. */ + void GC_generate_random_backtrace(void) + { + void * current; + GC_gcollect(); + current = GC_generate_random_valid_address(); + GC_printf1("Chose address 0x%lx in object\n", (unsigned long)current); + GC_print_backtrace(current); + } + +#endif /* KEEP_BACK_PTRS */ + /* Store debugging info into p. Return displaced pointer. */ /* Assumes we don't hold allocation lock. */ ptr_t GC_store_debug_info(p, sz, string, integer) @@ -100,6 +202,9 @@ word integer; /* But that's expensive. And this way things should only appear */ /* inconsistent while we're in the handler. */ LOCK(); +# ifdef KEEP_BACK_PTRS + ((oh *)p) -> oh_back_ptr = 0; +# endif ((oh *)p) -> oh_string = string; ((oh *)p) -> oh_int = integer; ((oh *)p) -> oh_sz = sz; @@ -110,7 +215,7 @@ word integer; return((ptr_t)result); } -/* Check the object with debugging info at p */ +/* Check the object with debugging info at ohdr */ /* return NIL if it's OK. Else return clobbered */ /* address. */ ptr_t GC_check_annotated_obj(ohdr) @@ -200,16 +305,8 @@ void GC_start_debugging() GC_register_displacement((word)sizeof(oh) + offset); } -# ifdef GC_ADD_CALLER -# define EXTRA_ARGS word ra, char * s, int i -# define OPT_RA ra, -# else -# define EXTRA_ARGS char * s, int i -# define OPT_RA -# endif - # ifdef __STDC__ - GC_PTR GC_debug_malloc(size_t lb, EXTRA_ARGS) + GC_PTR GC_debug_malloc(size_t lb, GC_EXTRA_PARAMS) # else GC_PTR GC_debug_malloc(lb, s, i) size_t lb; @@ -238,7 +335,7 @@ void GC_start_debugging() #ifdef STUBBORN_ALLOC # ifdef __STDC__ - GC_PTR GC_debug_malloc_stubborn(size_t lb, EXTRA_ARGS) + GC_PTR GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS) # else GC_PTR GC_debug_malloc_stubborn(lb, s, i) size_t lb; @@ -302,11 +399,35 @@ GC_PTR p; GC_end_stubborn_change(q); } -#endif /* STUBBORN_ALLOC */ +#else /* !STUBBORN_ALLOC */ # ifdef __STDC__ - GC_PTR GC_debug_malloc_atomic(size_t lb, EXTRA_ARGS) + GC_PTR GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS) # else + GC_PTR GC_debug_malloc_stubborn(lb, s, i) + size_t lb; + char * s; + int i; +# endif +{ + return GC_debug_malloc(lb, OPT_RA s, i); +} + +void GC_debug_change_stubborn(p) +GC_PTR p; +{ +} + +void GC_debug_end_stubborn_change(p) +GC_PTR p; +{ +} + +#endif /* !STUBBORN_ALLOC */ + +# ifdef __STDC__ + GC_PTR GC_debug_malloc_atomic(size_t lb, GC_EXTRA_PARAMS) +# else GC_PTR GC_debug_malloc_atomic(lb, s, i) size_t lb; char * s; @@ -330,7 +451,7 @@ GC_PTR p; } # ifdef __STDC__ - GC_PTR GC_debug_malloc_uncollectable(size_t lb, EXTRA_ARGS) + GC_PTR GC_debug_malloc_uncollectable(size_t lb, GC_EXTRA_PARAMS) # else GC_PTR GC_debug_malloc_uncollectable(lb, s, i) size_t lb; @@ -356,7 +477,7 @@ GC_PTR p; #ifdef ATOMIC_UNCOLLECTABLE # ifdef __STDC__ - GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, EXTRA_ARGS) + GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, GC_EXTRA_PARAMS) # else GC_PTR GC_debug_malloc_atomic_uncollectable(lb, s, i) size_t lb; @@ -389,13 +510,15 @@ GC_PTR p; GC_PTR p; # endif { - register GC_PTR base = GC_base(p); + register GC_PTR base; register ptr_t clobbered; + if (0 == p) return; + base = GC_base(p); if (base == 0) { GC_err_printf1("Attempt to free invalid pointer %lx\n", (unsigned long)p); - if (p != 0) ABORT("free(invalid pointer)"); + ABORT("free(invalid pointer)"); } if ((ptr_t)p - (ptr_t)base != sizeof(oh)) { GC_err_printf1( @@ -408,35 +531,33 @@ GC_PTR p; GC_err_printf0( "GC_debug_free: found previously deallocated (?) object at "); } else { - GC_err_printf0("GC_debug_free: found smashed object at "); + GC_err_printf0("GC_debug_free: found smashed location at "); } GC_print_smashed_obj(p, clobbered); } /* Invalidate size */ ((oh *)base) -> oh_sz = GC_size(base); } -# ifdef FIND_LEAK + if (GC_find_leak) { GC_free(base); -# else - { - register hdr * hhdr = HDR(p); - GC_bool uncollectable = FALSE; + } else { + register hdr * hhdr = HDR(p); + GC_bool uncollectable = FALSE; - if (hhdr -> hb_obj_kind == UNCOLLECTABLE) { - uncollectable = TRUE; - } -# ifdef ATOMIC_UNCOLLECTABLE - if (hhdr -> hb_obj_kind == AUNCOLLECTABLE) { - uncollectable = TRUE; - } -# endif - if (uncollectable) GC_free(base); + if (hhdr -> hb_obj_kind == UNCOLLECTABLE) { + uncollectable = TRUE; } -# endif +# ifdef ATOMIC_UNCOLLECTABLE + if (hhdr -> hb_obj_kind == AUNCOLLECTABLE) { + uncollectable = TRUE; + } +# endif + if (uncollectable) GC_free(base); + } /* !GC_find_leak */ } # ifdef __STDC__ - GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, EXTRA_ARGS) + GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, GC_EXTRA_PARAMS) # else GC_PTR GC_debug_realloc(p, lb, s, i) GC_PTR p; @@ -491,7 +612,7 @@ GC_PTR p; } clobbered = GC_check_annotated_obj((oh *)base); if (clobbered != 0) { - GC_err_printf0("GC_debug_realloc: found smashed object at "); + GC_err_printf0("GC_debug_realloc: found smashed location at "); GC_print_smashed_obj(p, clobbered); } old_sz = ((oh *)base) -> oh_sz; @@ -528,7 +649,7 @@ word dummy; if (clobbered != 0) { GC_err_printf0( - "GC_check_heap_block: found smashed object at "); + "GC_check_heap_block: found smashed location at "); GC_print_smashed_obj((ptr_t)p, clobbered); } }