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Edit File : objimpl.h \| Size : 3.52 KB
#ifndef Py_CPYTHON_OBJIMPL_H # error "this header file must not be included directly" #endif #ifdef __cplusplus extern "C" { #endif /* This function returns the number of allocated memory blocks, regardless of size / PyAPI_FUNC(Py_ssize_t) _Py_GetAllocatedBlocks(void); / Macros / #ifdef WITH_PYMALLOC PyAPI_FUNC(int) _PyObject_DebugMallocStats(FILE out); #endif typedef struct { /* user context passed as the first argument to the 2 functions / void ctx; /* allocate an arena of size bytes / void (alloc) (void ctx, size_t size); /* free an arena / void (free) (void ctx, void ptr, size_t size); } PyObjectArenaAllocator; /* Get the arena allocator. / PyAPI_FUNC(void) PyObject_GetArenaAllocator(PyObjectArenaAllocator allocator); /* Set the arena allocator. / PyAPI_FUNC(void) PyObject_SetArenaAllocator(PyObjectArenaAllocator allocator); PyAPI_FUNC(Py_ssize_t) _PyGC_CollectNoFail(void); PyAPI_FUNC(Py_ssize_t) _PyGC_CollectIfEnabled(void); /* Test if an object has a GC head / #define PyObject_IS_GC(o) \ (PyType_IS_GC(Py_TYPE(o)) \ && (Py_TYPE(o)->tp_is_gc == NULL \|\| Py_TYPE(o)->tp_is_gc(o))) / GC information is stored BEFORE the object structure. / typedef struct { // Pointer to next object in the list. // 0 means the object is not tracked uintptr_t _gc_next; // Pointer to previous object in the list. // Lowest two bits are used for flags documented later. uintptr_t _gc_prev; } PyGC_Head; #define _Py_AS_GC(o) ((PyGC_Head )(o)-1) /* True if the object is currently tracked by the GC. / #define _PyObject_GC_IS_TRACKED(o) (_Py_AS_GC(o)->_gc_next != 0) / True if the object may be tracked by the GC in the future, or already is. This can be useful to implement some optimizations. / #define _PyObject_GC_MAY_BE_TRACKED(obj) \ (PyObject_IS_GC(obj) && \ (!PyTuple_CheckExact(obj) \|\| _PyObject_GC_IS_TRACKED(obj))) / Bit flags for _gc_prev / / Bit 0 is set when tp_finalize is called / #define _PyGC_PREV_MASK_FINALIZED (1) / Bit 1 is set when the object is in generation which is GCed currently. / #define _PyGC_PREV_MASK_COLLECTING (2) / The (N-2) most significant bits contain the real address. / #define _PyGC_PREV_SHIFT (2) #define _PyGC_PREV_MASK (((uintptr_t) -1) << _PyGC_PREV_SHIFT) // Lowest bit of _gc_next is used for flags only in GC. // But it is always 0 for normal code. #define _PyGCHead_NEXT(g) ((PyGC_Head)(g)->_gc_next) #define _PyGCHead_SET_NEXT(g, p) ((g)->_gc_next = (uintptr_t)(p)) // Lowest two bits of _gc_prev is used for _PyGC_PREV_MASK_* flags. #define _PyGCHead_PREV(g) ((PyGC_Head)((g)->_gc_prev & _PyGC_PREV_MASK)) #define _PyGCHead_SET_PREV(g, p) do { \ assert(((uintptr_t)p & ~_PyGC_PREV_MASK) == 0); \ (g)->_gc_prev = ((g)->_gc_prev & ~_PyGC_PREV_MASK) \ \| ((uintptr_t)(p)); \ } while (0) #define _PyGCHead_FINALIZED(g) \ (((g)->_gc_prev & _PyGC_PREV_MASK_FINALIZED) != 0) #define _PyGCHead_SET_FINALIZED(g) \ ((g)->_gc_prev \|= _PyGC_PREV_MASK_FINALIZED) #define _PyGC_FINALIZED(o) \ _PyGCHead_FINALIZED(_Py_AS_GC(o)) #define _PyGC_SET_FINALIZED(o) \ _PyGCHead_SET_FINALIZED(_Py_AS_GC(o)) PyAPI_FUNC(PyObject ) _PyObject_GC_Malloc(size_t size); PyAPI_FUNC(PyObject ) _PyObject_GC_Calloc(size_t size); / Test if a type supports weak references / #define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0) #define PyObject_GET_WEAKREFS_LISTPTR(o) \ ((PyObject ) (((char ) (o)) + Py_TYPE(o)->tp_weaklistoffset)) #ifdef __cplusplus } #endif Back

Edit File : objimpl.h | Size : 3.52 KB

#ifndef Py_CPYTHON_OBJIMPL_H
#  error "this header file must not be included directly"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* This function returns the number of allocated memory blocks, regardless of size */
PyAPI_FUNC(Py_ssize_t) _Py_GetAllocatedBlocks(void);

/* Macros */
#ifdef WITH_PYMALLOC
PyAPI_FUNC(int) _PyObject_DebugMallocStats(FILE *out);
#endif

typedef struct {
    /* user context passed as the first argument to the 2 functions */
    void *ctx;

/* allocate an arena of size bytes */
    void* (*alloc) (void *ctx, size_t size);

/* free an arena */
    void (*free) (void *ctx, void *ptr, size_t size);
} PyObjectArenaAllocator;

/* Get the arena allocator. */
PyAPI_FUNC(void) PyObject_GetArenaAllocator(PyObjectArenaAllocator *allocator);

/* Set the arena allocator. */
PyAPI_FUNC(void) PyObject_SetArenaAllocator(PyObjectArenaAllocator *allocator);

PyAPI_FUNC(Py_ssize_t) _PyGC_CollectNoFail(void);
PyAPI_FUNC(Py_ssize_t) _PyGC_CollectIfEnabled(void);

/* Test if an object has a GC head */
#define PyObject_IS_GC(o) \
    (PyType_IS_GC(Py_TYPE(o)) \
     && (Py_TYPE(o)->tp_is_gc == NULL || Py_TYPE(o)->tp_is_gc(o)))

/* GC information is stored BEFORE the object structure. */
typedef struct {
    // Pointer to next object in the list.
    // 0 means the object is not tracked
    uintptr_t _gc_next;

// Pointer to previous object in the list.
    // Lowest two bits are used for flags documented later.
    uintptr_t _gc_prev;
} PyGC_Head;

#define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)

/* True if the object is currently tracked by the GC. */
#define _PyObject_GC_IS_TRACKED(o) (_Py_AS_GC(o)->_gc_next != 0)

/* True if the object may be tracked by the GC in the future, or already is.
   This can be useful to implement some optimizations. */
#define _PyObject_GC_MAY_BE_TRACKED(obj) \
    (PyObject_IS_GC(obj) && \
        (!PyTuple_CheckExact(obj) || _PyObject_GC_IS_TRACKED(obj)))

/* Bit flags for _gc_prev */
/* Bit 0 is set when tp_finalize is called */
#define _PyGC_PREV_MASK_FINALIZED  (1)
/* Bit 1 is set when the object is in generation which is GCed currently. */
#define _PyGC_PREV_MASK_COLLECTING (2)
/* The (N-2) most significant bits contain the real address. */
#define _PyGC_PREV_SHIFT           (2)
#define _PyGC_PREV_MASK            (((uintptr_t) -1) << _PyGC_PREV_SHIFT)

// Lowest bit of _gc_next is used for flags only in GC.
// But it is always 0 for normal code.
#define _PyGCHead_NEXT(g)        ((PyGC_Head*)(g)->_gc_next)
#define _PyGCHead_SET_NEXT(g, p) ((g)->_gc_next = (uintptr_t)(p))

// Lowest two bits of _gc_prev is used for _PyGC_PREV_MASK_* flags.
#define _PyGCHead_PREV(g) ((PyGC_Head*)((g)->_gc_prev & _PyGC_PREV_MASK))
#define _PyGCHead_SET_PREV(g, p) do { \
    assert(((uintptr_t)p & ~_PyGC_PREV_MASK) == 0); \
    (g)->_gc_prev = ((g)->_gc_prev & ~_PyGC_PREV_MASK) \
        | ((uintptr_t)(p)); \
    } while (0)

#define _PyGCHead_FINALIZED(g) \
    (((g)->_gc_prev & _PyGC_PREV_MASK_FINALIZED) != 0)
#define _PyGCHead_SET_FINALIZED(g) \
    ((g)->_gc_prev |= _PyGC_PREV_MASK_FINALIZED)

#define _PyGC_FINALIZED(o) \
    _PyGCHead_FINALIZED(_Py_AS_GC(o))
#define _PyGC_SET_FINALIZED(o) \
    _PyGCHead_SET_FINALIZED(_Py_AS_GC(o))

PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t size);
PyAPI_FUNC(PyObject *) _PyObject_GC_Calloc(size_t size);

/* Test if a type supports weak references */
#define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0)

#define PyObject_GET_WEAKREFS_LISTPTR(o) \
    ((PyObject **) (((char *) (o)) + Py_TYPE(o)->tp_weaklistoffset))

#ifdef __cplusplus
}
#endif

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