Added a failing test for calling parent vararg functions inside shared libs.

1 files changed, 54 insertions, 0 deletions

diff --git a/tests/runner.py b/tests/runner.py
index 06e2e99a..d40de496 100644
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -2090,6 +2090,60 @@ if 'benchmark' not in sys.argv:
                    output_nicerizer=lambda x: x.replace('\n', '*'),
                    post_build=add_pre_run_and_checks)
 
+    def test_dlfcn_varargs(self):
+      global BUILD_AS_SHARED_LIB, EXPORTED_FUNCTIONS
+      lib_src = r'''
+        void print_ints(int n, ...);
+        void func() {
+          print_ints(2, 13, 42);
+        }
+        '''
+      dirname = self.get_dir()
+      filename = os.path.join(dirname, 'liblib.cpp')
+      BUILD_AS_SHARED_LIB = 1
+      EXPORTED_FUNCTIONS = ['__Z4funcv']
+      self.build(lib_src, dirname, filename)
+      shutil.move(filename + '.o.js', os.path.join(dirname, 'liblib.so'))
+
+      src = r'''
+        #include <stdarg.h>
+        #include <stdio.h>
+        #include <dlfcn.h>
+
+        void print_ints(int n, ...) {
+          va_list args;
+          va_start(args, n);
+          for (int i = 0; i < n; i++) {
+            printf("%d\n", va_arg(args, int));
+          }
+          va_end(args);
+        }
+
+        int main() {
+          void* lib_handle;
+          void (*fptr)();
+
+          print_ints(2, 100, 200);
+
+          lib_handle = dlopen("liblib.so", RTLD_NOW);
+          fptr = (void (*)())dlsym(lib_handle, "_Z4funcv");
+          fptr();
+
+          return 0;
+        }
+        '''
+      BUILD_AS_SHARED_LIB = 0
+      EXPORTED_FUNCTIONS = ['_main']
+      def add_pre_run_and_checks(filename):
+        src = open(filename, 'r').read().replace(
+          '// {{PRE_RUN_ADDITIONS}}',
+          '''FS.createLazyFile('/', 'liblib.so', 'liblib.so', true, false);'''
+        )
+        open(filename, 'w').write(src)
+      self.do_test(src, 'Parent global: 123.*Parent global: 456.*',
+                   output_nicerizer=lambda x: x.replace('\n', '*'),
+                   post_build=add_pre_run_and_checks)
+
     def test_rand(self):
       src = r'''
         #include <stdio.h>