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comparison CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/python3.8/cpython/objimpl.h @ 69:33d812a61356

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planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d
author jpayne
date Tue, 18 Mar 2025 17:55:14 -0400
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67:0e9998148a16 69:33d812a61356
1 #ifndef Py_CPYTHON_OBJIMPL_H
2 # error "this header file must not be included directly"
3 #endif
4
5 #ifdef __cplusplus
6 extern "C" {
7 #endif
8
9 /* This function returns the number of allocated memory blocks, regardless of size */
10 PyAPI_FUNC(Py_ssize_t) _Py_GetAllocatedBlocks(void);
11
12 /* Macros */
13 #ifdef WITH_PYMALLOC
14 PyAPI_FUNC(int) _PyObject_DebugMallocStats(FILE *out);
15 #endif
16
17
18 typedef struct {
19 /* user context passed as the first argument to the 2 functions */
20 void *ctx;
21
22 /* allocate an arena of size bytes */
23 void* (*alloc) (void *ctx, size_t size);
24
25 /* free an arena */
26 void (*free) (void *ctx, void *ptr, size_t size);
27 } PyObjectArenaAllocator;
28
29 /* Get the arena allocator. */
30 PyAPI_FUNC(void) PyObject_GetArenaAllocator(PyObjectArenaAllocator *allocator);
31
32 /* Set the arena allocator. */
33 PyAPI_FUNC(void) PyObject_SetArenaAllocator(PyObjectArenaAllocator *allocator);
34
35
36 PyAPI_FUNC(Py_ssize_t) _PyGC_CollectNoFail(void);
37 PyAPI_FUNC(Py_ssize_t) _PyGC_CollectIfEnabled(void);
38
39
40 /* Test if an object has a GC head */
41 #define PyObject_IS_GC(o) \
42 (PyType_IS_GC(Py_TYPE(o)) \
43 && (Py_TYPE(o)->tp_is_gc == NULL || Py_TYPE(o)->tp_is_gc(o)))
44
45 /* GC information is stored BEFORE the object structure. */
46 typedef struct {
47 // Pointer to next object in the list.
48 // 0 means the object is not tracked
49 uintptr_t _gc_next;
50
51 // Pointer to previous object in the list.
52 // Lowest two bits are used for flags documented later.
53 uintptr_t _gc_prev;
54 } PyGC_Head;
55
56 #define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)
57
58 /* True if the object is currently tracked by the GC. */
59 #define _PyObject_GC_IS_TRACKED(o) (_Py_AS_GC(o)->_gc_next != 0)
60
61 /* True if the object may be tracked by the GC in the future, or already is.
62 This can be useful to implement some optimizations. */
63 #define _PyObject_GC_MAY_BE_TRACKED(obj) \
64 (PyObject_IS_GC(obj) && \
65 (!PyTuple_CheckExact(obj) || _PyObject_GC_IS_TRACKED(obj)))
66
67
68 /* Bit flags for _gc_prev */
69 /* Bit 0 is set when tp_finalize is called */
70 #define _PyGC_PREV_MASK_FINALIZED (1)
71 /* Bit 1 is set when the object is in generation which is GCed currently. */
72 #define _PyGC_PREV_MASK_COLLECTING (2)
73 /* The (N-2) most significant bits contain the real address. */
74 #define _PyGC_PREV_SHIFT (2)
75 #define _PyGC_PREV_MASK (((uintptr_t) -1) << _PyGC_PREV_SHIFT)
76
77 // Lowest bit of _gc_next is used for flags only in GC.
78 // But it is always 0 for normal code.
79 #define _PyGCHead_NEXT(g) ((PyGC_Head*)(g)->_gc_next)
80 #define _PyGCHead_SET_NEXT(g, p) ((g)->_gc_next = (uintptr_t)(p))
81
82 // Lowest two bits of _gc_prev is used for _PyGC_PREV_MASK_* flags.
83 #define _PyGCHead_PREV(g) ((PyGC_Head*)((g)->_gc_prev & _PyGC_PREV_MASK))
84 #define _PyGCHead_SET_PREV(g, p) do { \
85 assert(((uintptr_t)p & ~_PyGC_PREV_MASK) == 0); \
86 (g)->_gc_prev = ((g)->_gc_prev & ~_PyGC_PREV_MASK) \
87 | ((uintptr_t)(p)); \
88 } while (0)
89
90 #define _PyGCHead_FINALIZED(g) \
91 (((g)->_gc_prev & _PyGC_PREV_MASK_FINALIZED) != 0)
92 #define _PyGCHead_SET_FINALIZED(g) \
93 ((g)->_gc_prev |= _PyGC_PREV_MASK_FINALIZED)
94
95 #define _PyGC_FINALIZED(o) \
96 _PyGCHead_FINALIZED(_Py_AS_GC(o))
97 #define _PyGC_SET_FINALIZED(o) \
98 _PyGCHead_SET_FINALIZED(_Py_AS_GC(o))
99
100
101 PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t size);
102 PyAPI_FUNC(PyObject *) _PyObject_GC_Calloc(size_t size);
103
104
105 /* Test if a type supports weak references */
106 #define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0)
107
108 #define PyObject_GET_WEAKREFS_LISTPTR(o) \
109 ((PyObject **) (((char *) (o)) + Py_TYPE(o)->tp_weaklistoffset))
110
111 #ifdef __cplusplus
112 }
113 #endif