URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [include/] [gc_backptr.h] - Rev 733
Go to most recent revision | Compare with Previous | Blame | View Log
/* * 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. */ #ifndef GC_BACKPTR_H #define GC_BACKPTR_H /* 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 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; 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); /* Print a backtrace from a specific address. Used by the */ /* above. The client should call GC_gcollect() immediately */ /* before invocation. */ void GC_print_backtrace(void *); #endif /* GC_BACKPTR_H */
Go to most recent revision | Compare with Previous | Blame | View Log