CPP: Add a test of FunctionPointerConversions.ql.

Author: geoffw0

cpp/ql/test/query-tests/JPL_C/LOC-4/Rule 30/FunctionPointerConversions/FunctionPointerConversions.expected

@@ -0,0 +1,6 @@
+| test.c:11:16:11:23 | & ... | Function pointer converted to int *, which is not an integral type. |
+| test.c:12:18:12:25 | & ... | Function pointer converted to void *, which is not an integral type. |
+| test.c:17:11:17:17 | funPtr1 | Function pointer converted to int *, which is not an integral type. |
+| test.c:18:12:18:18 | funPtr1 | Function pointer converted to void *, which is not an integral type. |
+| test.c:29:18:29:24 | funPtr1 | Function pointer converted to int *, which is not an integral type. |
+| test.c:30:20:30:26 | funPtr1 | Function pointer converted to void *, which is not an integral type. |

cpp/ql/test/query-tests/JPL_C/LOC-4/Rule 30/FunctionPointerConversions/FunctionPointerConversions.qlref

@@ -0,0 +1 @@
+JPL_C/LOC-4/Rule 30/FunctionPointerConversions.ql

cpp/ql/test/query-tests/JPL_C/LOC-4/Rule 30/FunctionPointerConversions/test.c

@@ -0,0 +1,32 @@
+// test.c
+
+void myFunc1();
+
+typedef void (*voidFunPtr)();
+
+void test()
+{
+	void (*funPtr1)() = &myFunc1; // GOOD
+	voidFunPtr funPtr2 = &myFunc1; // GOOD
+	int *intPtr = &myFunc1; // BAD (function pointer -> int pointer)
+	void *voidPtr = &myFunc1; // BAD (function pointer -> void pointer)
+	int i = &myFunc1; // GOOD (permitted)
+
+	funPtr1 = funPtr1; // GOOD
+	funPtr2 = funPtr1; // GOOD
+	intPtr = funPtr1; // BAD (function pointer -> int pointer)
+	voidPtr = funPtr1; // BAD (function pointer -> void pointer)
+	i = funPtr1; // GOOD (permitted)
+
+	funPtr1 = funPtr2; // GOOD
+	funPtr2 = funPtr2; // GOOD
+	intPtr = funPtr2; // BAD (function pointer -> int pointer) [NOT DETECTED]
+	voidPtr = funPtr2; // BAD (function pointer -> void pointer) [NOT DETECTED]
+	i = funPtr2; // GOOD (permitted)
+
+	funPtr1 = (void (*)())funPtr1; // GOOD
+	funPtr2 = (voidFunPtr)funPtr1; // GOOD
+	intPtr = (int *)funPtr1; // BAD (function pointer -> int pointer)
+	voidPtr = (void *)funPtr1; // BAD (function pointer -> void pointer)
+	i = (int)funPtr1; // GOOD (permitted)
+}