Add llvm_cbuilder tests

llvm_cbuilder/tests/test_pthread.py

@@ -0,0 +1,92 @@
+from llvm.core import *
+from llvm.passes import *
+from llvm.ee import *
+from llvm_cbuilder import *
+import llvm_cbuilder.shortnames as C
+import unittest, logging
+import sys
+
+# logging.basicConfig(level=logging.DEBUG)
+
+NUM_OF_THREAD = 4
+
+def gen_test_worker(mod):
+    cb = CBuilder.new_function(mod, 'worker', C.void, [C.pointer(C.int)])
+    pval = cb.args[0]
+    val = pval.load()
+    one = cb.constant(val.type, 1)
+    pval.store(val + one)
+    cb.ret()
+    cb.close()
+
+def gen_test_pthread(mod):
+    cb = CBuilder.new_function(mod, 'manager', C.int, [C.int])
+    arg = cb.args[0]
+
+    worker_func = cb.get_function_named('worker')
+    pthread_create = cb.get_function_named('pthread_create')
+    pthread_join = cb.get_function_named('pthread_join')
+
+
+    NULL = cb.constant_null(C.void_p)
+    cast_to_null = lambda x: x.cast(C.void_p)
+
+    threads = cb.array(C.void_p, NUM_OF_THREAD)
+
+    for tid in range(NUM_OF_THREAD):
+        pthread_create_args = [threads[tid].reference(),
+                               NULL,
+                               worker_func,
+                               arg.reference()]
+        pthread_create(*map(cast_to_null, pthread_create_args))
+
+    worker_func(arg.reference())
+
+    for tid in range(NUM_OF_THREAD):
+        pthread_join_args = threads[tid], NULL
+        pthread_join(*map(cast_to_null, pthread_join_args))
+
+    cb.ret(arg)
+    cb.close()
+    return cb.function
+
+class TestPThread(unittest.TestCase):
+    @unittest.skipIf(sys.platform == 'win32', "pthreads not supported on Windows")
+    def test_pthread(self):
+        mod = Module.new(__name__)
+        # add pthread functions
+
+        mod.add_function(Type.function(C.int,
+                                       [C.void_p, C.void_p, C.void_p, C.void_p]),
+                         'pthread_create')
+
+        mod.add_function(Type.function(C.int,
+                                       [C.void_p, C.void_p]),
+                         'pthread_join')
+
+        gen_test_worker(mod)
+        lf_test_pthread = gen_test_pthread(mod)
+        logging.debug(mod)
+        mod.verify()
+
+        exe = CExecutor(mod)
+        exe.engine.get_pointer_to_function(mod.get_function_named('worker'))
+        func = exe.get_ctype_function(lf_test_pthread, 'int, int')
+
+        inarg = 1234
+        gold = inarg + NUM_OF_THREAD + 1
+        self.assertLessEqual(func(inarg), gold)
+        # Cannot determine the exact return value due to untamed race condition
+
+        count_race = 0
+        for _ in range(2**12):
+            if func(inarg) != gold:
+                count_race += 1
+
+        if count_race > 0:
+            logging.info("Race condition occured %d times.", count_race)
+            logging.info("Race condition is expected.")
+
+if __name__ == '__main__':
+    unittest.main()
+