/* * Copyright (c) 1994 by Xerox Corporation. All rights reserved. * Copyright (c) 1996 by Silicon Graphics. All rights reserved. * Copyright (c) 1998 by Fergus Henderson. All rights reserved. * Copyright (c) 2000-2009 by Hewlett-Packard Development 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.
*/
/* * This is a simple API to implement pointer back tracing, i.e. * to answer questions such as "who is pointing to this" or * "why is this object being retained by the collector" * * Most of these calls yield useful information on only after * a garbage collection. Usually the client will first force * a full collection and then gather information, preferably * before much intervening allocation. * * The implementation of the interface is only about 99.9999% * correct. It is intended to be good enough for profiling, * but is not intended to be used with production code. * * Results are likely to be much more useful if all allocation is * accomplished through the debugging allocators. * * The implementation idea is due to A. Demers.
*/
#ifndef GC_BACKPTR_H #define GC_BACKPTR_H
#ifndef GC_H # include "gc.h" #endif
#ifdef __cplusplus extern"C" { #endif
/* Store information about the object referencing dest in *base_p */ /* and *offset_p. */ /* If multiple objects or roots point to dest, the one reported */ /* will be the last on used by the garbage collector to trace the */ /* object. */ /* 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. */ typedefenum {
GC_UNREFERENCED, /* No reference info available. */
GC_NO_SPACE, /* Dest not allocated with debug alloc. */
GC_REFD_FROM_ROOT, /* Referenced directly by root *base_p. */
GC_REFD_FROM_REG, /* Referenced from a register, i.e. */ /* a root without an address. */
GC_REFD_FROM_HEAP, /* Referenced from another heap obj. */
GC_FINALIZER_REFD /* Finalizable and hence accessible. */
} GC_ref_kind;
/* Generate a random heap address. */ /* The resulting address is in the heap, but */ /* not necessarily inside a valid object. */
GC_API void * GC_CALL GC_generate_random_heap_address(void);
/* Generate a random address inside a valid marked heap object. */
GC_API void * GC_CALL GC_generate_random_valid_address(void);
/* Force a garbage collection and generate a backtrace from a */ /* random heap address. */ /* This uses the GC logging mechanism (GC_printf) to produce */ /* output. It can often be called from a debugger. The */ /* source in dbg_mlc.c also serves as a sample client. */
GC_API void GC_CALL GC_generate_random_backtrace(void);
/* Print a backtrace from a specific address. Used by the */ /* above. The client should call GC_gcollect() immediately */ /* before invocation. */
GC_API void GC_CALL GC_print_backtrace(void *) GC_ATTR_NONNULL(1);
#ifdef __cplusplus
} /* extern "C" */ #endif
#endif/* GC_BACKPTR_H */
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