[ubsan] Test -fsanitize=function with a C program

[vsk]

Summary

Depends on D38210

test/ubsan/TestCases/TypeCheck/Function/function-c.c

+// RUN: %clangxx -x c -fsanitize=function %s -O3 -g -o %t
+// RUN: %run %t 2>&1 | FileCheck %s
+
+struct S {};
+
+void no_proto() {}
+
+void proto(void) {}
+
+typedef struct S (*vfunc0)(void);
+typedef void (*vfunc1)(void);
+typedef char (*vfunc2)(void);
+typedef short (*vfunc3)(void);
+typedef int (*vfunc4)(void);
+typedef long long (*vfunc5)(void);
+typedef float (*vfunc6)(void);
+typedef double (*vfunc7)(void);
+typedef void (*vfunc8)(int, int, int, int, int, int, int, int, int, int, int);
+
+void call_proto(void) {
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'struct S (*)(void)'
+  vfunc0 f0 = &proto;
+  f0();
+
+  // CHECK-NOT: function-c.c:[[@LINE+2]]:3: runtime error
+  vfunc1 f1 = &proto;
+  f1();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'char (*)(void)'
+  vfunc2 f2 = &proto;
+  f2();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'short (*)(void)'
+  vfunc3 f3 = &proto;
+  f3();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'int (*)(void)'
+  vfunc4 f4 = &proto;
+  f4();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'long long (*)(void)'
+  vfunc5 f5 = &proto;
+  f5();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'float (*)(void)'
+  vfunc6 f6 = &proto;
+  f6();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'double (*)(void)'
+  vfunc7 f7 = &proto;
+  f7();
+
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function proto through pointer to incorrect function type 'void (*)(int, int, int, int, int, int, int, int, int, int, int)'
+  vfunc8 f8 = &proto;
+  f8(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1);
+}
+
+void call_no_proto(void) {
+  // CHECK: function-c.c:[[@LINE+2]]:3: runtime error: call to function no_proto through pointer to incorrect function type 'struct S (*)(void)'
+  vfunc0 f0 = &no_proto;
+  f0();
+}
+
+int main() {
+  call_proto();
+  call_no_proto();
+  return 0;
+}