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# This is here to be used by cpyext and _hpy_universal.
# the destructor is a python function or None.
from rpython.rtyper.lltypesystem import rffi
from rpython.tool.cparser import CTypeSpace
from pypy.interpreter.baseobjspace import W_Root
from pypy.interpreter.typedef import TypeDef
from pypy.interpreter.gateway import interp2app
cts = CTypeSpace()
cts.parse_source("""
typedef void (*PyCapsule_Destructor)(void *);
typedef void (*HPyFunc_Capsule_Destructor)(const char *name, void *pointer, void *context);
typedef struct {
void *cpy_trampoline;
HPyFunc_Capsule_Destructor impl;
} HPyCapsule_Destructor;
""")
class W_Capsule(W_Root):
def __init__(self, space, pointer, name):
self.space = space
self.pointer = pointer
self.name = name
self.context = rffi.cast(rffi.VOIDP, 0)
if space.config.objspace.usemodules._hpy_universal:
self.destructor_hpy = cts.cast("HPyCapsule_Destructor*", 0)
else:
self.destructor_hpy = None
def descr_repr(self, space):
if self.name:
name = '"' + rffi.constcharp2str(self.name) + '"'
else:
name = ""
addr = hex(rffi.cast(rffi.SIGNED, self.pointer))
return space.newtext("capsule object %s at %s" %(name, addr))
def _finalize_(self):
if self.destructor_hpy:
self.destructor_hpy.c_impl(self.name, self.pointer, self.context)
def set_destructor_hpy(self, space, destructor):
self.destructor_hpy = cts.cast("HPyCapsule_Destructor*", destructor)
if self.destructor_hpy:
self.register_finalizer(space)
W_Capsule.typedef = TypeDef(
"PyCapsule",
__doc__ = """
Capsule objects let you wrap a C "void *" pointer in a Python
object. They're a way of passing data through the Python interpreter
without creating your own custom type.
Capsules are used for communication between extension modules.
They provide a way for an extension module to export a C interface
to other extension modules, so that extension modules can use the
Python import mechanism to link to one another.
""",
__repr__ = interp2app(W_Capsule.descr_repr),
)
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