/usr/lib/mlton/include/gc/weak.h is in mlton-basis 20100608-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /* Copyright (C) 1999-2007 Henry Cejtin, Matthew Fluet, Suresh
* Jagannathan, and Stephen Weeks.
* Copyright (C) 1997-2000 NEC Research Institute.
*
* MLton is released under a BSD-style license.
* See the file MLton-LICENSE for details.
*/
#if (defined (MLTON_GC_INTERNAL_TYPES))
/*
* Weak objects have the following layout:
*
* header ::
* padding ::
* link (native-pointer) ::
* objptr (object-pointer)
*
* The object type indexed by the header determines whether the weak
* is valid or not. If the type has numObjptrs == 1, then the weak
* pointer is valid. Otherwise, the type has numObjptrs == 0 and the
* weak pointer is not valid.
*
* There may be zero or more bytes of padding for alignment purposes.
*
* The link native-pointer is used to chain the live weaks together
* during a copying/mark-compact gc and is otherwise unused.
*
* The final component is the weak object-pointer.
*
* Note that the order of the fields is important. The non-objptr
* field must be first, because a weak object is sometimes treated as
* a normal object.
*/
typedef struct GC_weak {
struct GC_weak *link;
objptr objptr;
} __attribute__ ((packed)) *GC_weak;
COMPILE_TIME_ASSERT(GC_weak__packed,
sizeof(struct GC_weak) ==
sizeof(struct GC_weak*)
+ sizeof(objptr));
#endif /* (defined (MLTON_GC_INTERNAL_TYPES)) */
#if (defined (MLTON_GC_INTERNAL_FUNCS))
static inline size_t sizeofWeak (GC_state s);
static inline size_t offsetofWeak (GC_state s);
#endif /* (defined (MLTON_GC_INTERNAL_FUNCS)) */
#if (defined (MLTON_GC_INTERNAL_BASIS))
PRIVATE uint32_t GC_weakCanGet (GC_state s, pointer p);
PRIVATE pointer GC_weakGet (GC_state s, pointer p);
PRIVATE pointer GC_weakNew (GC_state s, GC_header header, pointer p);
#endif /* (defined (MLTON_GC_INTERNAL_BASIS)) */
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