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import pytest, sys
try:
# comment out the following line to run this test.
# the latest on x86-64 linux: https://github.com/libffi/libffi/issues/574
if sys.platform != 'win32':
raise ImportError("this test is skipped because it keeps finding "
"failures in libffi, instead of cffi")
from hypothesis import given, settings, example
from hypothesis import strategies as st
except ImportError as e:
e1 = e
def test_types():
pytest.skip(str(e1))
else:
from cffi import FFI
import sys, random
from .test_recompiler import verify
ALL_PRIMITIVES = [
'unsigned char',
'short',
'int',
'long',
'long long',
'float',
'double',
#'long double', --- on x86 it can give libffi crashes
]
def _make_struct(s):
return st.lists(s, min_size=1)
types = st.one_of(st.sampled_from(ALL_PRIMITIVES),
st.lists(st.sampled_from(ALL_PRIMITIVES), min_size=1))
# NB. 'types' could be st.recursive instead, but it doesn't
# really seem useful
def draw_primitive(ffi, typename):
value = random.random() * 2**40
if typename != 'long double':
return ffi.cast(typename, value)
else:
return value
TEST_RUN_COUNTER = 0
@given(st.lists(types), types)
@settings(max_examples=100, deadline=5000) # 5000ms
def test_types(tp_args, tp_result):
global TEST_RUN_COUNTER
print(tp_args, tp_result)
cdefs = []
structs = {}
def build_type(tp):
if type(tp) is list:
field_types = [build_type(tp1) for tp1 in tp]
fields = ['%s f%d;' % (ftp, j)
for (j, ftp) in enumerate(field_types)]
fields = '\n '.join(fields)
name = 's%d' % len(cdefs)
cdefs.append("typedef struct {\n %s\n} %s;" % (fields, name))
structs[name] = field_types
return name
else:
return tp
args = [build_type(tp) for tp in tp_args]
result = build_type(tp_result)
TEST_RUN_COUNTER += 1
signature = "%s testfargs(%s)" % (result,
', '.join(['%s a%d' % (arg, i) for (i, arg) in enumerate(args)])
or 'void')
source = list(cdefs)
cdefs.append("%s;" % signature)
cdefs.append("extern %s testfargs_result;" % result)
for i, arg in enumerate(args):
cdefs.append("extern %s testfargs_arg%d;" % (arg, i))
source.append("%s testfargs_result;" % result)
for i, arg in enumerate(args):
source.append("%s testfargs_arg%d;" % (arg, i))
source.append(signature)
source.append("{")
for i, arg in enumerate(args):
source.append(" testfargs_arg%d = a%d;" % (i, i))
source.append(" return testfargs_result;")
source.append("}")
typedef_line = "typedef %s;" % (signature.replace('testfargs',
'(*mycallback_t)'),)
assert signature.endswith(')')
sig_callback = "%s testfcallback(mycallback_t callback)" % result
cdefs.append(typedef_line)
cdefs.append("%s;" % sig_callback)
source.append(typedef_line)
source.append(sig_callback)
source.append("{")
source.append(" return callback(%s);" %
', '.join(["testfargs_arg%d" % i for i in range(len(args))]))
source.append("}")
ffi = FFI()
ffi.cdef("\n".join(cdefs))
lib = verify(ffi, 'test_function_args_%d' % TEST_RUN_COUNTER,
"\n".join(source), no_cpp=True)
# when getting segfaults, enable this:
if False:
from testing.udir import udir
import subprocess
f = open(str(udir.join('run1.py')), 'w')
f.write('import sys; sys.path = %r\n' % (sys.path,))
f.write('from _CFFI_test_function_args_%d import ffi, lib\n' %
TEST_RUN_COUNTER)
for i in range(len(args)):
f.write('a%d = ffi.new("%s *")\n' % (i, args[i]))
aliststr = ', '.join(['a%d[0]' % i for i in range(len(args))])
f.write('lib.testfargs(%s)\n' % aliststr)
f.write('ffi.addressof(lib, "testfargs")(%s)\n' % aliststr)
f.close()
print("checking for segfault for direct call...")
rc = subprocess.call([sys.executable, 'run1.py'], cwd=str(udir))
assert rc == 0, rc
def make_arg(tp):
if tp in structs:
return [make_arg(tp1) for tp1 in structs[tp]]
else:
return draw_primitive(ffi, tp)
passed_args = [make_arg(arg) for arg in args]
returned_value = make_arg(result)
def write(p, v):
if type(v) is list:
for i, v1 in enumerate(v):
write(ffi.addressof(p, 'f%d' % i), v1)
else:
p[0] = v
write(ffi.addressof(lib, 'testfargs_result'), returned_value)
## CALL forcing libffi
print("CALL forcing libffi")
received_return = ffi.addressof(lib, 'testfargs')(*passed_args)
##
_tp_long_double = ffi.typeof("long double")
def check(p, v):
if type(v) is list:
for i, v1 in enumerate(v):
check(ffi.addressof(p, 'f%d' % i), v1)
else:
if ffi.typeof(p).item is _tp_long_double:
assert ffi.cast("double", p[0]) == v
else:
assert p[0] == v
for i, arg in enumerate(passed_args):
check(ffi.addressof(lib, 'testfargs_arg%d' % i), arg)
ret = ffi.new(result + "*", received_return)
check(ret, returned_value)
## CALLBACK
def expand(value):
if isinstance(value, ffi.CData):
t = ffi.typeof(value)
if t is _tp_long_double:
return float(ffi.cast("double", value))
return [expand(getattr(value, 'f%d' % i))
for i in range(len(t.fields))]
else:
return value
# when getting segfaults, enable this:
if False:
from testing.udir import udir
import subprocess
f = open(str(udir.join('run1.py')), 'w')
f.write('import sys; sys.path = %r\n' % (sys.path,))
f.write('from _CFFI_test_function_args_%d import ffi, lib\n' %
TEST_RUN_COUNTER)
f.write('def callback(*args): return ffi.new("%s *")[0]\n' % result)
f.write('fptr = ffi.callback("%s(%s)", callback)\n' % (result,
','.join(args)))
f.write('print(lib.testfcallback(fptr))\n')
f.close()
print("checking for segfault for callback...")
rc = subprocess.call([sys.executable, 'run1.py'], cwd=str(udir))
assert rc == 0, rc
seen_args = []
def callback(*args):
seen_args.append([expand(arg) for arg in args])
return returned_value
fptr = ffi.callback("%s(%s)" % (result, ','.join(args)), callback)
print("CALL with callback")
received_return = lib.testfcallback(fptr)
assert len(seen_args) == 1
assert passed_args == seen_args[0]
ret = ffi.new(result + "*", received_return)
check(ret, returned_value)
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