generator: sumof: support any type, generate explicit code

[free-sw/xcb/libxcb] / src / c_client.py

diff --git a/src/c_client.py b/src/c_client.py
index c8a1a03..0dd053d 100644 (file)
--- a/src/c_client.py
+++ b/src/c_client.py
@@ -1611,7 +1611,34 @@ def _c_accessor_get_expr(expr, field_mapping):
         c_length_func = "%s(%s)" % (field.c_length_name, list_name)
         # note: xcb_sumof() has only been defined for integers
         c_length_func = _c_accessor_get_expr(field.type.expr, field_mapping)
-        return 'xcb_sumof(%s, %s)' % (list_name, c_length_func)
+        # create explicit code for computing the sum.
+        # This works for all C-types which can be added to int64_t with +=
+        _c_pre.start()
+        lengthvar = _c_pre.get_tempvarname()
+        loopvar = _c_pre.get_tempvarname()
+        sumvar = _c_pre.get_tempvarname()
+        listvar = _c_pre.get_tempvarname()
+        _c_pre.tempvar("int %s; /* sumof length */", lengthvar)
+        _c_pre.tempvar("int %s; /* sumof loop counter */", loopvar)
+        _c_pre.tempvar("int64_t %s; /* sumof sum */", sumvar)
+        _c_pre.tempvar(
+             "const %s* %s; /* sumof list ptr */", field.c_field_type, listvar)
+        _c_pre.code("/* sumof start */")
+        _c_pre.code("%s = %s;", lengthvar, c_length_func)
+        _c_pre.code("%s = 0;", sumvar)
+        _c_pre.code("%s = %s;", listvar, list_name)
+        _c_pre.code(
+            "for (%s = 0; %s < %s; %s++) {",
+           loopvar, loopvar, lengthvar, loopvar)
+        _c_pre.indent()
+        _c_pre.code("%s += *%s;", sumvar, listvar)
+        _c_pre.code("%s++;", listvar);
+        _c_pre.pop_indent()
+        _c_pre.code("}")
+        _c_pre.code("/* sumof end. Result is in %s */", sumvar)
+        _c_pre.end()
+        return sumvar;
+        # return 'xcb_sumof(%s, %s)' % (list_name, c_length_func)
     elif expr.op != None:
         return ('(' + _c_accessor_get_expr(expr.lhs, field_mapping) +
                 ' ' + expr.op + ' ' +