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7f918cf1 CE |
1 | /* Copyright (C) 2016 Matthew Fluet. |
2 | * Copyright (C) 1999-2007 Henry Cejtin, Matthew Fluet, Suresh | |
3 | * Jagannathan, and Stephen Weeks. | |
4 | * Copyright (C) 1997-2000 NEC Research Institute. | |
5 | * | |
6 | * MLton is released under a BSD-style license. | |
7 | * See the file MLton-LICENSE for details. | |
8 | */ | |
9 | ||
10 | size_t sizeofWeak (GC_state s) { | |
11 | size_t res; | |
12 | ||
13 | res = GC_NORMAL_METADATA_SIZE + sizeof (struct GC_weak); | |
14 | res = align (res, s->alignment); | |
15 | if (DEBUG) { | |
16 | size_t check; | |
17 | uint16_t bytesNonObjptrs, numObjptrs; | |
18 | ||
19 | splitHeader (s, GC_WEAK_GONE_HEADER, NULL, NULL, &bytesNonObjptrs, &numObjptrs); | |
20 | check = GC_NORMAL_METADATA_SIZE + (bytesNonObjptrs + (numObjptrs * OBJPTR_SIZE)); | |
21 | if (DEBUG_DETAILED) | |
22 | fprintf (stderr, | |
23 | "sizeofWeak: res = %"PRIuMAX" check = %"PRIuMAX"\n", | |
24 | (uintmax_t)res, (uintmax_t)check); | |
25 | assert (check == res); | |
26 | } | |
27 | assert (isAligned (res, s->alignment)); | |
28 | return res; | |
29 | } | |
30 | ||
31 | size_t offsetofWeak (GC_state s) { | |
32 | return (sizeofWeak (s)) - (GC_NORMAL_METADATA_SIZE + sizeof (struct GC_weak)); | |
33 | } | |
34 | ||
35 | uint32_t GC_weakCanGet (__attribute__ ((unused)) GC_state s, pointer p) { | |
36 | uint32_t res; | |
37 | ||
38 | res = GC_WEAK_GONE_HEADER != getHeader (p); | |
39 | if (DEBUG_WEAK) | |
40 | fprintf (stderr, "%s = GC_weakCanGet ("FMTPTR")\n", | |
41 | boolToString (res), (uintptr_t)p); | |
42 | return res; | |
43 | } | |
44 | ||
45 | pointer GC_weakGet (GC_state s, pointer p) { | |
46 | GC_weak weak; | |
47 | pointer res; | |
48 | ||
49 | weak = (GC_weak)(p + offsetofWeak (s)); | |
50 | res = objptrToPointer(weak->objptr, s->heap.start); | |
51 | if (DEBUG_WEAK) | |
52 | fprintf (stderr, FMTPTR" = GC_weakGet ("FMTPTR")\n", | |
53 | (uintptr_t)res, (uintptr_t)p); | |
54 | return res; | |
55 | } | |
56 | ||
57 | pointer GC_weakNew (GC_state s, GC_header header, pointer p) { | |
58 | GC_weak weak; | |
59 | pointer res; | |
60 | ||
61 | res = newObject (s, header, | |
62 | sizeofWeak (s), | |
63 | FALSE); | |
64 | weak = (GC_weak)(res + offsetofWeak (s)); | |
65 | weak->objptr = pointerToObjptr(p, s->heap.start); | |
66 | if (DEBUG_WEAK) | |
67 | fprintf (stderr, FMTPTR" = GC_weakNew ("FMTHDR", "FMTPTR")\n", | |
68 | (uintptr_t)res, header, (uintptr_t)p); | |
69 | return (pointer)res; | |
70 | } |