in-progress

1 files changed, 46 insertions, 1 deletions

diff --git a/c/call_python.c b/c/call_python.c
index ebe25c5..0db96ad 100644
--- a/c/call_python.c
+++ b/c/call_python.c
@@ -1,6 +1,51 @@
 
-
 static void _cffi_call_python(struct _cffi_callpy_s *callpy, char *args)
 {
+    /* Invoked by the helpers generated from CFFI_CALL_PYTHON in the cdef.
+
+       'callpy' is a static structure that describes which of the
+       CFFI_CALL_PYTHON is called.  It has got fields 'name' and
+       'type_index' describing the function, and more reserved fields
+       that are initially zero.  These reserved fields are set up by
+       ffi.call_python(), which invokes init_call_python() below.
+
+       'args' is a pointer to an array of 8-byte entries.  Each entry
+       contains an argument.  If an argument is less than 8 bytes, only
+       the part at the beginning of the entry is initialized.  If an
+       argument is 'long double' or a struct/union, then it is passed
+       by reference.
+
+       'args' is also used as the place to write the result to.  In all
+       cases, 'args' is at least 8 bytes in size.
+    */
+    save_errno();
+    {
+#ifdef WITH_THREAD
+    PyGILState_STATE state = PyGILState_Ensure();
+#endif
+    const struct _cffi_type_context_s *ctx;
+    ctx = (const struct _cffi_type_context_s *)callpy->reserved1;
+
+    if (ctx == NULL) {
+        /* uninitialized! */
+        PyObject *f = PySys_GetObject("stderr");
+        if (f != NULL) {
+            PyFile_WriteString("CFFI_CALL_PYTHON: function ", f);
+            PyFile_WriteString(callpy->name, f);
+            PyFile_WriteString("() called, but no code was attached "
+                               "to it yet with ffi.call_python('", f);
+            PyFile_WriteString(callpy->name, f);
+            PyFile_WriteString("').  Returning 0.\n", f);
+        }
+        memset(args, 0, callpy->size_of_result);
+        return;
+    }
+
     abort();
+
+#ifdef WITH_THREAD
+    PyGILState_Release(state);
+#endif
+    }
+    restore_errno();
 }