Python typeof Examples

Example #1

    def test_wrapper(self):
        CU = self.FFI.compile('''
struct A {
    int a;
    int b;
};
struct A init_A(int a, int b) {
  struct A ret = {a,b};
  return ret;
}
        ''')
        FTy = pydffi.typeof(CU.funcs.init_A)
        print(FTy.getWrapperLLVMStr("wrap"))

Example #2

    def test_func_ptr(self):
        FFI = self.FFI
        CU = FFI.compile('''
typedef struct
{
  int a;
  int b;
  int res;
} Res;

typedef Res(*op)(int,int);

static Res get_res(int res, int a, int b) {
  Res Ret = {a,b,res};
  return Ret;
}

static Res add(int a, int b) {
  return get_res(a+b,a,b);
}
static Res sub(int a, int b) {
  return get_res(a-b,a,b);
}

op get_op(unsigned Id)
{
  if (Id == 0) return add;
  if (Id == 1) return sub;
  return 0;
}

Res call(op f, int a, int b) {
  return f(a,b);
}
        ''')

        Add = CU.funcs.get_op(0)
        Add = Add.obj
        Res = Add(1, 4)
        self.assertEqual(Res.res, 5)

        sub_addr = pydffi.ptr(CU.funcs.sub)
        Res = CU.funcs.call(sub_addr, 1, 5)
        self.assertEqual(Res.res, -4)

        subFuncTy = pydffi.typeof(CU.funcs.sub).type
        funcByAddr = subFuncTy(sub_addr)
        self.assertEqual(funcByAddr(1, 5).res, -4)

        funcByAddr = subFuncTy(sub_addr.value)
        self.assertEqual(funcByAddr(1, 5).res, -4)

Example #3

File: test_anon_struct.py Project: yangboyd/dragonffi

    def test_anon_struct(self):
        CU = self.FFI.compile('''
        struct A {
          struct {
            int a;
            int b;
          } s;
        };

        void dump(struct A a) {
          printf("s.a=%d, s.b=%d\\n", a.s.a, a.s.b);
        }
        ''')

        A = CU.types.A()
        Obj = A.s
        Ty = pydffi.typeof(Obj)
        fields = [f.name for f in iter(Ty)]
        self.assertEqual(set(fields), set(("a", "b")))

Example #4

# Copyright 2018 Adrien Guinet <*****@*****.**>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# RUN: "%python" "%s"

import pydffi
FFI = pydffi.FFI()
CU = FFI.compile('''
struct A {
    int a;
    int b;
};
struct A init_A(int a, int b) {
  struct A ret = {a,b};
  return ret;
}
''')
FTy = pydffi.typeof(CU.funcs.init_A)
print(FTy.getWrapperLLVMStr("wrap"))

Example #5

File: anon_struct.py Project: wangjieest/dragonffi

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# RUN: "%python" "%s"
#

import pydffi
FFI = pydffi.FFI()
CU = FFI.compile('''
struct A {
  struct {
    int a;
    int b;
  } s;
};

void dump(struct A a) {
  printf("s.a=%d, s.b=%d\\n", a.s.a, a.s.b);
}
''')

A = CU.types.A()
Obj = A.s
Ty = pydffi.typeof(Obj)
fields = [f.name for f in iter(Ty)]
assert (fields[0] == "a")
assert (fields[1] == "b")