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from rpython.rlib import jit
from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rlib.rdynload import DLLHANDLE
from pypy.interpreter.error import OperationError, oefmt
from pypy.interpreter.baseobjspace import W_Root
from pypy.interpreter.typedef import TypeDef
from pypy.interpreter.gateway import interp2app
from pypy.module._cffi_backend import parse_c_type, realize_c_type
from pypy.module._cffi_backend import cffi_opcode, cglob
from pypy.module._cffi_backend.realize_c_type import getop, getarg
from pypy.module._cffi_backend.cdataobj import W_CData
from pypy.module._cffi_backend.ctypefunc import W_CTypeFunc
from pypy.module._cffi_backend.wrapper import W_FunctionWrapper
class W_LibObject(W_Root):
libhandle = rffi.cast(DLLHANDLE, 0) # the dlopen()ed handle, if any
def __init__(self, ffi, libname):
self.space = ffi.space
self.ctx = ffi.ctxobj.ctx
self.ffi = ffi
self.dict_w = {} # content, built lazily
self.libname = libname # some string that gives the name of the lib
def descr_repr(self):
return self.space.newtext("<Lib object for '%s'>" % self.libname)
def make_includes_from(self, c_includes):
space = self.space
num = 0
includes = []
while c_includes[num]:
include_name = rffi.constcharp2str(c_includes[num])
try:
w_lib1 = space.appexec([space.newtext(include_name)], """(modname):
mod = __import__(modname, None, None, ['ffi', 'lib'])
return mod.lib""")
lib1 = space.interp_w(W_LibObject, w_lib1)
except OperationError as e:
if e.async(space):
raise
raise oefmt(space.w_ImportError,
"while loading %s: failed to import ffi, lib from %s",
self.libname, include_name)
includes.append((lib1.ffi, lib1))
num += 1
self.ffi.included_ffis_libs = includes[:]
def _build_cpython_func(self, g, fnname):
# Build a function: in the PyPy version, these are all equivalent
# and 'g->address' is a pointer to a function of exactly the
# C type specified --- almost: arguments that are structs or
# unions are replaced with pointers, and a return value that
# would be struct or union is instead handled by passing
# inside the function a hidden first pointer argument.
rawfunctype = realize_c_type.realize_c_type_or_func(
self.ffi, self.ctx.c_types, getarg(g.c_type_op))
assert isinstance(rawfunctype, realize_c_type.W_RawFuncType)
#
rawfunctype.prepare_nostruct_fnptr(self.ffi)
#
ptr = rffi.cast(rffi.CCHARP, g.c_address)
assert ptr
direct_fn = rffi.cast(rffi.CCHARP, g.c_size_or_direct_fn)
return W_FunctionWrapper(self.space, self.ffi,
ptr, direct_fn,
rawfunctype, fnname, self.libname)
@jit.elidable_promote()
def _get_attr_elidable(self, attr):
return self.dict_w[attr] # KeyError if not found
@jit.dont_look_inside
def _build_attr(self, attr):
index = parse_c_type.search_in_globals(self.ctx, attr)
if index < 0:
for ffi1, lib1 in self.ffi.included_ffis_libs:
if lib1 is not None:
try:
w_result = lib1._get_attr_elidable(attr)
break # found, break out of this loop
except KeyError:
w_result = lib1._build_attr(attr)
if w_result is not None:
break # found, break out of this loop
else:
w_result = ffi1.fetch_int_constant(attr)
if w_result is not None:
break # found, break out of this loop
else:
return None # not found at all
else:
space = self.space
g = rffi.cast(rffi.CArrayPtr(parse_c_type.GLOBAL_S), self.ctx.c_globals)[index]
op = getop(g.c_type_op)
if (op == cffi_opcode.OP_CPYTHON_BLTN_V or
op == cffi_opcode.OP_CPYTHON_BLTN_N or
op == cffi_opcode.OP_CPYTHON_BLTN_O):
# A function
w_result = self._build_cpython_func(g, attr)
#
elif op == cffi_opcode.OP_GLOBAL_VAR:
# A global variable of the exact type specified here
# (nowadays, only used by the ABI mode or backend
# compatibility; see OP_GLOBAL_F for the API mode
w_ct = realize_c_type.realize_c_type(
self.ffi, self.ctx.c_types, getarg(g.c_type_op))
g_size = rffi.cast(lltype.Signed, g.c_size_or_direct_fn)
if g_size != w_ct.size and g_size != 0 and w_ct.size > 0:
raise oefmt(self.ffi.w_FFIError,
"global variable '%s' should be %d bytes "
"according to the cdef, but is actually %d",
attr, w_ct.size, g_size)
ptr = rffi.cast(rffi.CCHARP, g.c_address)
if not ptr: # for dlopen() style
ptr = self.cdlopen_fetch(attr)
w_result = cglob.W_GlobSupport(space, attr, w_ct, ptr=ptr)
#
elif op == cffi_opcode.OP_GLOBAL_VAR_F:
w_ct = realize_c_type.realize_c_type(
self.ffi, self.ctx.c_types, getarg(g.c_type_op))
w_result = cglob.W_GlobSupport(space, attr, w_ct,
fetch_addr=g.c_address)
#
elif (op == cffi_opcode.OP_CONSTANT_INT or
op == cffi_opcode.OP_ENUM):
# A constant integer whose value, in an "unsigned long long",
# is obtained by calling the function at g->address
w_result = realize_c_type.realize_global_int(self.ffi, g,
index)
#
elif (op == cffi_opcode.OP_CONSTANT or
op == cffi_opcode.OP_DLOPEN_CONST):
# A constant which is not of integer type
w_ct = realize_c_type.realize_c_type(
self.ffi, self.ctx.c_types, getarg(g.c_type_op))
fetch_funcptr = rffi.cast(
realize_c_type.FUNCPTR_FETCH_CHARP,
g.c_address)
if w_ct.size <= 0:
raise oefmt(self.ffi.w_FFIError,
"constant '%s' is of type '%s', "
"whose size is not known", attr, w_ct.name)
raise oefmt(space.w_SystemError,
"constant has no known size")
if not fetch_funcptr: # for dlopen() style
assert op == cffi_opcode.OP_DLOPEN_CONST
ptr = self.cdlopen_fetch(attr)
else:
assert op == cffi_opcode.OP_CONSTANT
ptr = lltype.malloc(rffi.CCHARP.TO, w_ct.size, flavor='raw')
self.ffi._finalizer.free_mems.append(ptr)
fetch_funcptr(ptr)
w_result = w_ct.convert_to_object(ptr)
#
elif op == cffi_opcode.OP_DLOPEN_FUNC:
# For dlopen(): the function of the given 'name'. We use
# dlsym() to get the address of something in the dynamic
# library, which we interpret as being exactly a function of
# the specified type.
ptr = self.cdlopen_fetch(attr)
w_ct = realize_c_type.realize_c_type_or_func(
self.ffi, self.ctx.c_types, getarg(g.c_type_op))
# must have returned a function type:
assert isinstance(w_ct, realize_c_type.W_RawFuncType)
w_ctfnptr = w_ct.unwrap_as_fnptr(self.ffi)
w_result = W_CData(self.space, ptr, w_ctfnptr)
#
#
elif op == cffi_opcode.OP_EXTERN_PYTHON:
# for reading 'lib.bar' where bar is declared
# as an extern "Python"
w_ct = realize_c_type.realize_c_type(
self.ffi, self.ctx.c_types, getarg(g.c_type_op))
ptr = lltype.direct_fieldptr(g, 'c_size_or_direct_fn')
w_result = w_ct.convert_to_object(rffi.cast(rffi.CCHARP, ptr))
else:
raise oefmt(space.w_NotImplementedError,
"in lib_build_attr: op=%d", op)
assert w_result is not None
self.dict_w[attr] = w_result
return w_result
def _get_attr(self, w_attr, is_getattr=False):
attr = self.space.text_w(w_attr)
try:
w_value = self._get_attr_elidable(attr)
except KeyError:
w_value = self._build_attr(attr)
if w_value is None:
if is_getattr and attr == '__all__':
return self.dir1(ignore_global_vars=True)
if is_getattr and attr == '__dict__':
return self.full_dict_copy()
if is_getattr and attr == '__class__':
# used to be space.type(self). But HAAAAAACK!
# That makes help() behave correctly. I couldn't
# find a more reasonable way. Urgh.
from pypy.interpreter.module import Module
return self.space.gettypeobject(Module.typedef)
if is_getattr and attr == '__name__':
return self.space.newtext("%s.lib" % self.libname)
if is_getattr and attr == '__loader__':
return self.space.w_None # PyPy/CPython 3.x only
if is_getattr and attr == '__spec__':
return self.space.w_None # PyPy/CPython 3.x only
raise oefmt(self.space.w_AttributeError,
"cffi library '%s' has no function, constant "
"or global variable named '%s'",
self.libname, attr)
return w_value
def descr_getattribute(self, w_attr):
w_value = self._get_attr(w_attr, is_getattr=True)
if isinstance(w_value, cglob.W_GlobSupport):
w_value = w_value.read_global_var()
return w_value
def descr_setattr(self, w_attr, w_newvalue):
w_value = self._get_attr(w_attr)
if isinstance(w_value, cglob.W_GlobSupport):
w_value.write_global_var(w_newvalue)
else:
raise oefmt(self.space.w_AttributeError,
"cannot write to function or constant '%s'",
self.space.text_w(w_attr))
def descr_delattr(self, w_attr):
self._get_attr(w_attr) # for the possible AttributeError
raise oefmt(self.space.w_AttributeError,
"C attribute cannot be deleted")
def descr_dir(self):
return self.dir1()
def dir1(self, ignore_global_vars=False):
space = self.space
total = rffi.getintfield(self.ctx, 'c_num_globals')
g = rffi.cast(rffi.CArrayPtr(parse_c_type.GLOBAL_S), self.ctx.c_globals)
names_w = []
for i in range(total):
if ignore_global_vars:
op = getop(g[i].c_type_op)
if (op == cffi_opcode.OP_GLOBAL_VAR or
op == cffi_opcode.OP_GLOBAL_VAR_F):
continue
names_w.append(space.newtext(rffi.constcharp2str(g[i].c_name)))
return space.newlist(names_w)
def full_dict_copy(self):
space = self.space
total = rffi.getintfield(self.ctx, 'c_num_globals')
g = rffi.cast(rffi.CArrayPtr(parse_c_type.GLOBAL_S), self.ctx.c_globals)
w_result = space.newdict()
for i in range(total):
w_attr = space.newtext(rffi.constcharp2str(g[i].c_name))
w_value = self._get_attr(w_attr)
space.setitem(w_result, w_attr, w_value)
return w_result
def address_of_func_or_global_var(self, varname):
# rebuild a string object from 'varname', to do typechecks and
# to force a unicode back to a plain string
space = self.space
w_value = self._get_attr(space.newtext(varname))
if isinstance(w_value, cglob.W_GlobSupport):
# regular case: a global variable
return w_value.address()
#
if isinstance(w_value, W_FunctionWrapper):
# '&func' returns a regular cdata pointer-to-function
return w_value.try_extract_direct_fnptr_as_cdata(space)
#
if (isinstance(w_value, W_CData) and
isinstance(w_value.ctype, W_CTypeFunc)):
# '&func' is 'func' in C, for a constant function 'func'
return w_value
#
raise oefmt(space.w_AttributeError,
"cannot take the address of the constant '%s'", varname)
def cdlopen_fetch(self, name):
raise NotImplementedError
def cdlopen_close(self):
raise oefmt(self.ffi.w_FFIError,
"library '%s' was not created with ffi.dlopen()",
self.libname)
W_LibObject.typedef = TypeDef(
'_cffi_backend.Lib',
__repr__ = interp2app(W_LibObject.descr_repr),
__getattribute__ = interp2app(W_LibObject.descr_getattribute),
__setattr__ = interp2app(W_LibObject.descr_setattr),
__delattr__ = interp2app(W_LibObject.descr_delattr),
__dir__ = interp2app(W_LibObject.descr_dir),
)
W_LibObject.typedef.acceptable_as_base_class = False
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