--- /dev/null
+/*
+ * 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.
+ *
+ * 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, October 9, 1995 1:16 pm PDT */
+# include "gc_priv.h"
+
+/* 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. */
+GC_bool GC_has_debug_info(p)
+ptr_t p;
+{
+ register oh * ohdr = (oh *)p;
+ register ptr_t body = (ptr_t)(ohdr + 1);
+ register word sz = GC_size((ptr_t) ohdr);
+
+ if (HBLKPTR((ptr_t)ohdr) != HBLKPTR((ptr_t)body)
+ || sz < sizeof (oh)) {
+ return(FALSE);
+ }
+ if (ohdr -> oh_sz == sz) {
+ /* Object may have had debug info, but has been deallocated */
+ return(FALSE);
+ }
+ if (ohdr -> oh_sf == (START_FLAG ^ (word)body)) return(TRUE);
+ if (((word *)ohdr)[BYTES_TO_WORDS(sz)-1] == (END_FLAG ^ (word)body)) {
+ return(TRUE);
+ }
+ return(FALSE);
+}
+
+/* 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)
+register ptr_t p; /* base pointer */
+word sz; /* bytes */
+char * string;
+word integer;
+{
+ register word * result = (word *)((oh *)p + 1);
+ DCL_LOCK_STATE;
+
+ /* There is some argument that we should dissble signals here. */
+ /* But that's expensive. And this way things should only appear */
+ /* inconsistent while we're in the handler. */
+ LOCK();
+ ((oh *)p) -> oh_string = string;
+ ((oh *)p) -> oh_int = integer;
+ ((oh *)p) -> oh_sz = sz;
+ ((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
+ ((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
+ result[ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
+ UNLOCK();
+ return((ptr_t)result);
+}
+
+/* Check the object with debugging info at p */
+/* return NIL if it's OK. Else return clobbered */
+/* address. */
+ptr_t GC_check_annotated_obj(ohdr)
+register oh * ohdr;
+{
+ register ptr_t body = (ptr_t)(ohdr + 1);
+ register word gc_sz = GC_size((ptr_t)ohdr);
+ if (ohdr -> oh_sz + DEBUG_BYTES > gc_sz) {
+ return((ptr_t)(&(ohdr -> oh_sz)));
+ }
+ if (ohdr -> oh_sf != (START_FLAG ^ (word)body)) {
+ return((ptr_t)(&(ohdr -> oh_sf)));
+ }
+ if (((word *)ohdr)[BYTES_TO_WORDS(gc_sz)-1] != (END_FLAG ^ (word)body)) {
+ return((ptr_t)((word *)ohdr + BYTES_TO_WORDS(gc_sz)-1));
+ }
+ if (((word *)body)[ROUNDED_UP_WORDS(ohdr -> oh_sz)]
+ != (END_FLAG ^ (word)body)) {
+ return((ptr_t)((word *)body + ROUNDED_UP_WORDS(ohdr -> oh_sz)));
+ }
+ return(0);
+}
+
+void GC_print_obj(p)
+ptr_t p;
+{
+ register oh * ohdr = (oh *)GC_base(p);
+
+ GC_err_printf1("0x%lx (", (unsigned long)ohdr + sizeof(oh));
+ GC_err_puts(ohdr -> oh_string);
+ GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
+ (unsigned long)(ohdr -> oh_sz));
+ PRINT_CALL_CHAIN(ohdr);
+}
+
+void GC_debug_print_heap_obj_proc(p)
+ptr_t p;
+{
+ if (GC_has_debug_info(p)) {
+ GC_print_obj(p);
+ } else {
+ GC_default_print_heap_obj_proc(p);
+ }
+}
+
+void GC_print_smashed_obj(p, clobbered_addr)
+ptr_t p, clobbered_addr;
+{
+ register oh * ohdr = (oh *)GC_base(p);
+
+ GC_err_printf2("0x%lx in object at 0x%lx(", (unsigned long)clobbered_addr,
+ (unsigned long)p);
+ if (clobbered_addr <= (ptr_t)(&(ohdr -> oh_sz))
+ || ohdr -> oh_string == 0) {
+ GC_err_printf1("<smashed>, appr. sz = %ld)\n",
+ GC_size((ptr_t)ohdr) - DEBUG_BYTES);
+ } else {
+ if (ohdr -> oh_string[0] == '\0') {
+ GC_err_puts("EMPTY(smashed?)");
+ } else {
+ GC_err_puts(ohdr -> oh_string);
+ }
+ GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
+ (unsigned long)(ohdr -> oh_sz));
+ PRINT_CALL_CHAIN(ohdr);
+ }
+}
+
+void GC_check_heap_proc();
+
+void GC_start_debugging()
+{
+ GC_check_heap = GC_check_heap_proc;
+ GC_print_heap_obj = GC_debug_print_heap_obj_proc;
+ GC_debugging_started = TRUE;
+ GC_register_displacement((word)sizeof(oh));
+}
+
+# if defined(__STDC__) || defined(__cplusplus)
+ void GC_debug_register_displacement(GC_word offset)
+# else
+ void GC_debug_register_displacement(offset)
+ GC_word offset;
+# endif
+{
+ GC_register_displacement(offset);
+ 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)
+# else
+ GC_PTR GC_debug_malloc(lb, s, i)
+ size_t lb;
+ char * s;
+ int i;
+# ifdef GC_ADD_CALLER
+ --> GC_ADD_CALLER not implemented for K&R C
+# endif
+# endif
+{
+ GC_PTR result = GC_malloc(lb + DEBUG_BYTES);
+
+ if (result == 0) {
+ GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
+ (unsigned long) lb);
+ GC_err_puts(s);
+ GC_err_printf1(":%ld)\n", (unsigned long)i);
+ return(0);
+ }
+ if (!GC_debugging_started) {
+ GC_start_debugging();
+ }
+ ADD_CALL_CHAIN(result, ra);
+ return (GC_store_debug_info(result, (word)lb, s, (word)i));
+}
+
+#ifdef STUBBORN_ALLOC
+# ifdef __STDC__
+ GC_PTR GC_debug_malloc_stubborn(size_t lb, EXTRA_ARGS)
+# else
+ GC_PTR GC_debug_malloc_stubborn(lb, s, i)
+ size_t lb;
+ char * s;
+ int i;
+# endif
+{
+ GC_PTR result = GC_malloc_stubborn(lb + DEBUG_BYTES);
+
+ if (result == 0) {
+ GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
+ (unsigned long) lb);
+ GC_err_puts(s);
+ GC_err_printf1(":%ld)\n", (unsigned long)i);
+ return(0);
+ }
+ 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_debug_change_stubborn(p)
+GC_PTR p;
+{
+ register GC_PTR q = GC_base(p);
+ register hdr * hhdr;
+
+ if (q == 0) {
+ GC_err_printf1("Bad argument: 0x%lx to GC_debug_change_stubborn\n",
+ (unsigned long) p);
+ ABORT("GC_debug_change_stubborn: bad arg");
+ }
+ hhdr = HDR(q);
+ if (hhdr -> hb_obj_kind != STUBBORN) {
+ GC_err_printf1("GC_debug_change_stubborn arg not stubborn: 0x%lx\n",
+ (unsigned long) p);
+ ABORT("GC_debug_change_stubborn: arg not stubborn");
+ }
+ GC_change_stubborn(q);
+}
+
+void GC_debug_end_stubborn_change(p)
+GC_PTR p;
+{
+ register GC_PTR q = GC_base(p);
+ register hdr * hhdr;
+
+ if (q == 0) {
+ GC_err_printf1("Bad argument: 0x%lx to GC_debug_end_stubborn_change\n",
+ (unsigned long) p);
+ ABORT("GC_debug_end_stubborn_change: bad arg");
+ }
+ hhdr = HDR(q);
+ if (hhdr -> hb_obj_kind != STUBBORN) {
+ GC_err_printf1("debug_end_stubborn_change arg not stubborn: 0x%lx\n",
+ (unsigned long) p);
+ ABORT("GC_debug_end_stubborn_change: arg not stubborn");
+ }
+ GC_end_stubborn_change(q);
+}
+
+#endif /* STUBBORN_ALLOC */
+
+# ifdef __STDC__
+ GC_PTR GC_debug_malloc_atomic(size_t lb, EXTRA_ARGS)
+# else
+ GC_PTR GC_debug_malloc_atomic(lb, s, i)
+ size_t lb;
+ char * s;
+ int i;
+# endif
+{
+ GC_PTR result = GC_malloc_atomic(lb + DEBUG_BYTES);
+
+ if (result == 0) {
+ GC_err_printf1("GC_debug_malloc_atomic(%ld) returning NIL (",
+ (unsigned long) lb);
+ GC_err_puts(s);
+ GC_err_printf1(":%ld)\n", (unsigned long)i);
+ return(0);
+ }
+ if (!GC_debugging_started) {
+ GC_start_debugging();
+ }
+ ADD_CALL_CHAIN(result, ra);
+ return (GC_store_debug_info(result, (word)lb, s, (word)i));
+}
+
+# ifdef __STDC__
+ GC_PTR GC_debug_malloc_uncollectable(size_t lb, EXTRA_ARGS)
+# else
+ GC_PTR GC_debug_malloc_uncollectable(lb, s, i)
+ size_t lb;
+ char * s;
+ int i;
+# endif
+{
+ GC_PTR result = GC_malloc_uncollectable(lb + DEBUG_BYTES);
+
+ if (result == 0) {
+ GC_err_printf1("GC_debug_malloc_uncollectable(%ld) returning NIL (",
+ (unsigned long) lb);
+ GC_err_puts(s);
+ GC_err_printf1(":%ld)\n", (unsigned long)i);
+ return(0);
+ }
+ if (!GC_debugging_started) {
+ GC_start_debugging();
+ }
+ ADD_CALL_CHAIN(result, ra);
+ return (GC_store_debug_info(result, (word)lb, s, (word)i));
+}
+
+#ifdef ATOMIC_UNCOLLECTABLE
+# ifdef __STDC__
+ GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, EXTRA_ARGS)
+# else
+ GC_PTR GC_debug_malloc_atomic_uncollectable(lb, s, i)
+ size_t lb;
+ char * s;
+ int i;
+# endif
+{
+ GC_PTR result = GC_malloc_atomic_uncollectable(lb + DEBUG_BYTES);
+
+ if (result == 0) {
+ GC_err_printf1(
+ "GC_debug_malloc_atomic_uncollectable(%ld) returning NIL (",
+ (unsigned long) lb);
+ GC_err_puts(s);
+ GC_err_printf1(":%ld)\n", (unsigned long)i);
+ return(0);
+ }
+ if (!GC_debugging_started) {
+ GC_start_debugging();
+ }
+ ADD_CALL_CHAIN(result, ra);
+ return (GC_store_debug_info(result, (word)lb, s, (word)i));
+}
+#endif /* ATOMIC_UNCOLLECTABLE */
+
+# ifdef __STDC__
+ void GC_debug_free(GC_PTR p)
+# else
+ void GC_debug_free(p)
+ GC_PTR p;
+# endif
+{
+ register GC_PTR base = GC_base(p);
+ register ptr_t clobbered;
+
+ if (base == 0) {
+ GC_err_printf1("Attempt to free invalid pointer %lx\n",
+ (unsigned long)p);
+ if (p != 0) ABORT("free(invalid pointer)");
+ }
+ if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
+ GC_err_printf1(
+ "GC_debug_free called on pointer %lx wo debugging info\n",
+ (unsigned long)p);
+ } else {
+ clobbered = GC_check_annotated_obj((oh *)base);
+ if (clobbered != 0) {
+ if (((oh *)base) -> oh_sz == GC_size(base)) {
+ GC_err_printf0(
+ "GC_debug_free: found previously deallocated (?) object at ");
+ } else {
+ GC_err_printf0("GC_debug_free: found smashed object at ");
+ }
+ GC_print_smashed_obj(p, clobbered);
+ }
+ /* Invalidate size */
+ ((oh *)base) -> oh_sz = GC_size(base);
+ }
+# ifdef FIND_LEAK
+ GC_free(base);
+# 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);
+ }
+# endif
+}
+
+# ifdef __STDC__
+ GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, EXTRA_ARGS)
+# else
+ GC_PTR GC_debug_realloc(p, lb, s, i)
+ GC_PTR p;
+ size_t lb;
+ char *s;
+ int i;
+# endif
+{
+ register GC_PTR base = GC_base(p);
+ register ptr_t clobbered;
+ register GC_PTR result;
+ register size_t copy_sz = lb;
+ register size_t old_sz;
+ register hdr * hhdr;
+
+ if (p == 0) return(GC_debug_malloc(lb, OPT_RA s, i));
+ if (base == 0) {
+ GC_err_printf1(
+ "Attempt to reallocate invalid pointer %lx\n", (unsigned long)p);
+ ABORT("realloc(invalid pointer)");
+ }
+ if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
+ GC_err_printf1(
+ "GC_debug_realloc called on pointer %lx wo debugging info\n",
+ (unsigned long)p);
+ return(GC_realloc(p, lb));
+ }
+ hhdr = HDR(base);
+ switch (hhdr -> hb_obj_kind) {
+# ifdef STUBBORN_ALLOC
+ case STUBBORN:
+ result = GC_debug_malloc_stubborn(lb, OPT_RA s, i);
+ break;
+# endif
+ case NORMAL:
+ result = GC_debug_malloc(lb, OPT_RA s, i);
+ break;
+ case PTRFREE:
+ result = GC_debug_malloc_atomic(lb, OPT_RA s, i);
+ break;
+ case UNCOLLECTABLE:
+ result = GC_debug_malloc_uncollectable(lb, OPT_RA s, i);
+ break;
+# ifdef ATOMIC_UNCOLLECTABLE
+ case AUNCOLLECTABLE:
+ result = GC_debug_malloc_atomic_uncollectable(lb, OPT_RA s, i);
+ break;
+# endif
+ default:
+ GC_err_printf0("GC_debug_realloc: encountered bad kind\n");
+ ABORT("bad kind");
+ }
+ clobbered = GC_check_annotated_obj((oh *)base);
+ if (clobbered != 0) {
+ GC_err_printf0("GC_debug_realloc: found smashed object at ");
+ GC_print_smashed_obj(p, clobbered);
+ }
+ old_sz = ((oh *)base) -> oh_sz;
+ if (old_sz < copy_sz) copy_sz = old_sz;
+ if (result == 0) return(0);
+ BCOPY(p, result, copy_sz);
+ GC_debug_free(p);
+ return(result);
+}
+
+/* Check all marked objects in the given block for validity */
+/*ARGSUSED*/
+void GC_check_heap_block(hbp, dummy)
+register struct hblk *hbp; /* ptr to current heap block */
+word dummy;
+{
+ register struct hblkhdr * hhdr = HDR(hbp);
+ register word sz = hhdr -> hb_sz;
+ register int word_no;
+ register word *p, *plim;
+
+ p = (word *)(hbp->hb_body);
+ word_no = HDR_WORDS;
+ if (sz > MAXOBJSZ) {
+ plim = p;
+ } else {
+ plim = (word *)((((word)hbp) + HBLKSIZE) - WORDS_TO_BYTES(sz));
+ }
+ /* go through all words in block */
+ while( p <= plim ) {
+ if( mark_bit_from_hdr(hhdr, word_no)
+ && GC_has_debug_info((ptr_t)p)) {
+ ptr_t clobbered = GC_check_annotated_obj((oh *)p);
+
+ if (clobbered != 0) {
+ GC_err_printf0(
+ "GC_check_heap_block: found smashed object at ");
+ GC_print_smashed_obj((ptr_t)p, clobbered);
+ }
+ }
+ word_no += sz;
+ p += sz;
+ }
+}
+
+
+/* This assumes that all accessible objects are marked, and that */
+/* I hold the allocation lock. Normally called by collector. */
+void GC_check_heap_proc()
+{
+# ifndef SMALL_CONFIG
+ if (sizeof(oh) & (2 * sizeof(word) - 1) != 0) {
+ ABORT("Alignment problem: object header has inappropriate size\n");
+ }
+# endif
+ GC_apply_to_all_blocks(GC_check_heap_block, (word)0);
+}
+
+struct closure {
+ GC_finalization_proc cl_fn;
+ GC_PTR cl_data;
+};
+
+# ifdef __STDC__
+ void * GC_make_closure(GC_finalization_proc fn, void * data)
+# else
+ GC_PTR GC_make_closure(fn, data)
+ GC_finalization_proc fn;
+ GC_PTR data;
+# endif
+{
+ struct closure * result =
+ (struct closure *) GC_malloc(sizeof (struct closure));
+
+ result -> cl_fn = fn;
+ result -> cl_data = data;
+ return((GC_PTR)result);
+}
+
+# ifdef __STDC__
+ void GC_debug_invoke_finalizer(void * obj, void * data)
+# else
+ void GC_debug_invoke_finalizer(obj, data)
+ char * obj;
+ char * data;
+# endif
+{
+ register struct closure * cl = (struct closure *) data;
+
+ (*(cl -> cl_fn))((GC_PTR)((char *)obj + sizeof(oh)), cl -> cl_data);
+}
+
+
+# ifdef __STDC__
+ void GC_debug_register_finalizer(GC_PTR obj, GC_finalization_proc fn,
+ GC_PTR cd, GC_finalization_proc *ofn,
+ GC_PTR *ocd)
+# else
+ void GC_debug_register_finalizer(obj, fn, cd, ofn, ocd)
+ GC_PTR obj;
+ GC_finalization_proc fn;
+ GC_PTR cd;
+ GC_finalization_proc *ofn;
+ GC_PTR *ocd;
+# endif
+{
+ ptr_t base = GC_base(obj);
+ if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
+ GC_err_printf1(
+ "GC_register_finalizer called with non-base-pointer 0x%lx\n",
+ obj);
+ }
+ GC_register_finalizer(base, GC_debug_invoke_finalizer,
+ GC_make_closure(fn,cd), ofn, ocd);
+}
+
+# ifdef __STDC__
+ void GC_debug_register_finalizer_ignore_self
+ (GC_PTR obj, GC_finalization_proc fn,
+ GC_PTR cd, GC_finalization_proc *ofn,
+ GC_PTR *ocd)
+# else
+ void GC_debug_register_finalizer_ignore_self
+ (obj, fn, cd, ofn, ocd)
+ GC_PTR obj;
+ GC_finalization_proc fn;
+ GC_PTR cd;
+ GC_finalization_proc *ofn;
+ GC_PTR *ocd;
+# endif
+{
+ ptr_t base = GC_base(obj);
+ if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
+ GC_err_printf1(
+ "GC_register_finalizer_ignore_self called with non-base-pointer 0x%lx\n",
+ obj);
+ }
+ GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
+ GC_make_closure(fn,cd), ofn, ocd);
+}
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