diff options
Diffstat (limited to 'gc/backptr.h')
| -rw-r--r-- | gc/backptr.h | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/gc/backptr.h b/gc/backptr.h deleted file mode 100644 index d34224e..0000000 --- a/gc/backptr.h +++ /dev/null @@ -1,56 +0,0 @@ -/* - * 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" - * - * This API assumes that we have an ANSI C compiler. - * - * 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. - */ - -/* 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. */ -typedef enum { GC_UNREFERENCED, /* No refence info available. */ - GC_NO_SPACE, /* Dest not allocated with debug alloc */ - GC_REFD_FROM_ROOT, /* Referenced directly by root *base_p */ - GC_REFD_FROM_HEAP, /* Referenced from another heap obj. */ - GC_FINALIZER_REFD /* Finalizable and hence accessible. */ -} GC_ref_kind; - -GC_ref_kind GC_get_back_ptr_info(void *dest, void **base_p, size_t *offset_p); - -/* 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); - -/* Generate a random address inside a valid marked heap object. */ -void * 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. */ -void GC_generate_random_backtrace(void); - - |