X-Git-Url: http://git.demorecorder.com/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fc_client.py;h=cce620ff4f8f8dd32a7b79d9ae638e26e51239ee;hb=c6f3fb2529a6211221e8254f58c85fd67c1d8844;hp=6f8f8f2ac4401e1f2447284ed9ea2d06ce0121f1;hpb=d74d066949dbbbbbcb03bf7764e63f4347f99974;p=free-sw%2Fxcb%2Flibxcb

diff --git a/src/c_client.py b/src/c_client.py
index 6f8f8f2..cce620f 100644
--- a/src/c_client.py
+++ b/src/c_client.py
@@ -58,6 +58,107 @@ def _hc(fmt, *args):
     _h(fmt, *args)
     _c(fmt, *args)
 
+def _c_wr_stringlist(indent, strlist):
+    '''
+    Writes the given list of strings to the source file.
+    Each line is prepended by the indent string
+    '''
+    for str in strlist:
+        _c("%s%s", indent, str)
+
+
+class PreCode(object):
+    '''
+    For pre-code generated by expression generation
+    (for example, the for-loop of a sumof)
+    This has to account for recursiveness of the expression
+    generation, i.e., there may be pre-code for pre-code.
+    Therefore this is implemented as a stack of lists of lines.
+
+    If redirection is switched on, then all output is collected in
+    self.redirect_code and self.redirect_tempvars instead of
+    being sent to the output via _h und _c.
+    '''
+    def __init__(self):
+        self.nesting_level = 0
+        self.tempvars = []
+        self.codelines = []
+        self.redirect_code = None
+        self.redirect_tempvars = None
+        self.indent_str = '    '
+        self.indent_stack = []
+        self.tempvar_num = 0
+
+
+    # start and end of pre-code blocks
+    def start(self):
+        self.nesting_level += 1
+
+    def end(self):
+        self.nesting_level -= 1
+        if self.nesting_level == 0:
+            # lowest pre-code level is finished -> output to source
+            if self.redirect_tempvars is None:
+                _c_wr_stringlist('', self.tempvars)
+                self.tempvars = []
+            else:
+                self.redirect_tempvars.extend(self.tempvars)
+                self.tempvars = []
+            if self.redirect_code == None:
+                _c_wr_stringlist('', self.codelines)
+                self.codelines = []
+            else:
+                self.redirect_code.extend(self.codelines)
+                self.codelines = []
+
+
+    def output_tempvars(self):
+        if self.redirect_code == None:
+            _c_wr_stringlist('', self.tempvars)
+            self.tempvars = []
+
+    # output to precode
+    def code(self, fmt, *args):
+        self.codelines.append(self.indent_str + fmt % args)
+
+    def tempvar(self, fmt, *args):
+        self.tempvars.append('    ' + (fmt % args))
+
+    # get a unique name for a temporary variable
+    def get_tempvarname(self):
+        self.tempvar_num += 1
+        return "xcb_pre_tmp_%d" % self.tempvar_num
+
+    # indentation
+
+    def push_indent(self, indentstr):
+        self.indent_stack.append(self.indent_str)
+        self.indent_str = indentstr
+
+    def push_addindent(self, indent_add_str):
+        self.push_indent(self.indent_str + indent_add_str)
+
+    def indent(self):
+        self.push_addindent('    ')
+
+    def pop_indent(self):
+        self.indent_str = self.indent_stack.pop()
+
+    # redirection to lists
+    def redirect_start(self, redirect_code, redirect_tempvars=None):
+        self.redirect_code = redirect_code
+        self.redirect_tempvars = redirect_tempvars
+        if redirect_tempvars is not None:
+            self.tempvar_num = 0
+
+    def redirect_end(self):
+        self.redirect_code = None
+        self.redirect_tempvars = None
+
+# global PreCode handler
+_c_pre = PreCode()
+
+
 # XXX See if this level thing is really necessary.
 def _h_setlevel(idx):
     '''
@@ -336,12 +437,6 @@ def _c_type_setup(self, name, postfix):
         first_field_after_varsized = None
 
         for field in self.fields:
-            _c_type_setup(field.type, field.field_type, ())
-            if field.type.is_list:
-                _c_type_setup(field.type.member, field.field_type, ())
-                if (field.type.nmemb is None):
-                    self.c_need_sizeof = True
-
             field.c_field_type = _t(field.field_type)
             field.c_field_const_type = ('' if field.type.nmemb == 1 else 'const ') + field.c_field_type
             field.c_field_name = _cpp(field.field_name)
@@ -358,7 +453,8 @@ def _c_type_setup(self, name, postfix):
                 field.c_pointer = '*'
                 field.c_field_const_type = 'const ' + field.c_field_type
                 self.c_need_aux = True
-            elif not field.type.fixed_size() and not field.type.is_case_or_bitcase:
+
+            if not field.type.fixed_size() and not field.type.is_case_or_bitcase:
                 self.c_need_sizeof = True
 
             field.c_iterator_type = _t(field.field_type + ('iterator',))      # xcb_fieldtype_iterator_t
@@ -390,6 +486,15 @@ def _c_type_setup(self, name, postfix):
                 if field.type.fixed_size():
                     field.prev_varsized_field = None
 
+            # recurse into this field this has to be done here, i.e.,
+            # after the field has been set up. Otherwise the function
+            # _c_helper_fieldaccess_expr will produce garbage or crash
+            _c_type_setup(field.type, field.field_type, ())
+            if field.type.is_list:
+                _c_type_setup(field.type.member, field.field_type, ())
+                if (field.type.nmemb is None):
+                    self.c_need_sizeof = True
+
     if self.c_need_serialize:
         # when _unserialize() is wanted, create _sizeof() as well for consistency reasons
         self.c_need_sizeof = True
@@ -426,23 +531,64 @@ def _c_type_setup(self, name, postfix):
                     _c_serialize('sizeof', self)
 # _c_type_setup()
 
-def _c_helper_absolute_name(prefix, field=None):
+# Functions for querying field properties
+def _c_field_needs_list_accessor(field):
+    return field.type.is_list and not field.type.fixed_size()
+
+def _c_field_needs_field_accessor(field):
+    if field.type.is_list:
+        return False
+    else:
+        return (field.prev_varsized_field is not None or
+                not field.type.fixed_size())
+
+def _c_field_needs_accessor(field):
+    return (_c_field_needs_list_accessor(field) or
+            _c_field_needs_field_accessor(field))
+
+def _c_field_is_member_of_case_or_bitcase(field):
+    return field.parent and field.parent.is_case_or_bitcase
+
+def _c_helper_fieldaccess_expr(prefix, field=None):
     """
     turn prefix, which is a list of tuples (name, separator, Type obj) into a string
-    representing a valid name in C (based on the context)
-    if field is not None, append the field name as well
+    representing a valid field-access-expression in C (based on the context)
+    if field is not None, append access to the field as well.
+
+    "separator" is one of the C-operators "." or "->".
+
+    A field access expression can consist of the following components:
+    * struct/union member access from a value with the "."-operator
+    * struct/union member access from a pointer with "->"-operator
+    * function-call of an accessor function:
+      This is used when a xcb-field is not contained in a struct.
+      This can, e.g., happen for fields after var-sized fields, etc.
     """
     prefix_str = ''
+    last_sep =''
     for name, sep, obj in prefix:
-        prefix_str += name
-        if '' == sep:
-            sep = '->'
-            if ((obj.is_case_or_bitcase and obj.has_name) or     # named bitcase
-                (obj.is_switch and len(obj.parents)>1)):
-                sep = '.'
-        prefix_str += sep
-    if field is not None:
-        prefix_str += _cpp(field.field_name)
+        prefix_str += last_sep + name
+        last_sep = sep
+
+    if field is None:
+        # add separator for access to a yet unknown field
+        prefix_str += last_sep
+    else:
+        if _c_field_needs_accessor(field):
+            if _c_field_is_member_of_case_or_bitcase(field):
+                # case members are available in the deserialized struct,
+                # so there is no need to use the accessor function
+                # (also, their accessor function needs a different arglist
+                # so this would require special treatment here)
+                # Therefore: Access as struct member
+                prefix_str += last_sep + _cpp(field.field_name)
+            else:
+                # Access with the accessor function
+                prefix_str = field.c_accessor_name + "(" + prefix_str + ")"
+        else:
+            # Access as struct member
+            prefix_str += last_sep + _cpp(field.field_name)
+
     return prefix_str
 # _c_absolute_name
 
@@ -464,7 +610,7 @@ def _c_helper_field_mapping(complex_type, prefix, flat=False):
                 all_fields.update(_c_helper_field_mapping(b.type, bitcase_prefix, flat))
     else:
         for f in complex_type.fields:
-            fname = _c_helper_absolute_name(prefix, f)
+            fname = _c_helper_fieldaccess_expr(prefix, f)
             if f.field_name in all_fields:
                 raise Exception("field name %s has been registered before" % f.field_name)
 
@@ -577,6 +723,31 @@ def resolve_expr_fields(complex_obj):
     return unresolved
 # resolve_expr_fields()
 
+def resolve_expr_fields_list(self, parents):
+    """
+    Find expr fields appearing in a list and descendents
+    that cannot be resolved within the parents of the list.
+    These are normally fields that need to be given as function parameters
+    for length and iterator functions.
+    """
+    all_fields = []
+    expr_fields = get_expr_fields(self)
+    unresolved = []
+
+    for complex_obj in parents:
+        for field in complex_obj.fields:
+            if field.wire:
+                all_fields.append(field)
+
+    # try to resolve expr fields
+    for e in expr_fields:
+        if e not in all_fields and e not in unresolved:
+            unresolved.append(e)
+
+    return unresolved
+# resolve_expr_fields_list()
+
+
 def get_serialize_params(context, self, buffer_var='_buffer', aux_var='_aux'):
     """
     functions like _serialize(), _unserialize(), and _unpack() sometimes need additional parameters:
@@ -656,9 +827,15 @@ def get_serialize_params(context, self, buffer_var='_buffer', aux_var='_aux'):
     return (param_fields, wire_fields, params)
 # get_serialize_params()
 
-def _c_serialize_helper_insert_padding(context, code_lines, space, postpone):
+def _c_serialize_helper_insert_padding(context, code_lines, space, postpone, is_case_or_bitcase):
     code_lines.append('%s    /* insert padding */' % space)
-    code_lines.append('%s    xcb_pad = -xcb_block_len & (xcb_align_to - 1);' % space)
+    if is_case_or_bitcase:
+        code_lines.append(
+            '%s    xcb_pad = -(xcb_block_len + xcb_padding_offset) & (xcb_align_to - 1);'
+            % space)
+    else:
+        code_lines.append(
+            '%s    xcb_pad = -xcb_block_len & (xcb_align_to - 1);' % space)
 #    code_lines.append('%s    printf("automatically inserting padding: %%%%d\\n", xcb_pad);' % space)
     code_lines.append('%s    xcb_buffer_len += xcb_block_len + xcb_pad;' % space)
 
@@ -676,6 +853,8 @@ def _c_serialize_helper_insert_padding(context, code_lines, space, postpone):
         code_lines.append('%s    }' % space)
 
     code_lines.append('%s    xcb_block_len = 0;' % space)
+    if is_case_or_bitcase:
+        code_lines.append('%s    xcb_padding_offset = 0;' % space)
 
     # keep tracking of xcb_parts entries for serialize
     return 1
@@ -741,7 +920,7 @@ def _c_serialize_helper_switch_field(context, self, field, c_switch_variable, pr
     # switch is handled by this function as a special case
     param_fields, wire_fields, params = get_serialize_params(context, self)
     field_mapping = _c_helper_field_mapping(self, prefix)
-    prefix_str = _c_helper_absolute_name(prefix)
+    prefix_str = _c_helper_fieldaccess_expr(prefix)
 
     # find the parameters that need to be passed to _serialize()/_unpack():
     # all switch expr fields must be given as parameters
@@ -770,10 +949,24 @@ def _c_serialize_helper_switch_field(context, self, field, c_switch_variable, pr
     elif context in ('unserialize', 'unpack'):
         length = "%s(xcb_tmp, %s&%s%s)" % (field.type.c_unpack_name,
                                            c_field_names, prefix_str, field.c_field_name)
+    elif 'sizeof' == context:
+        # remove trailing ", " from c_field_names because it will be used at end of arglist
+        my_c_field_names = c_field_names[:-2]
+        length = "%s(xcb_tmp, %s)" % (field.type.c_sizeof_name, my_c_field_names)
 
     return length
 # _c_serialize_helper_switch_field()
 
+def _c_get_additional_type_params(type):
+    """
+    compute list of additional params for functions created for the given type
+    """
+    if type.is_simple:
+        return []
+    else:
+        param_fields, wire_fields, params = get_serialize_params('sizeof', type)
+        return params[1:]
+
 def _c_serialize_helper_list_field(context, self, field,
                                    code_lines, temp_vars,
                                    space, prefix):
@@ -781,7 +974,7 @@ def _c_serialize_helper_list_field(context, self, field,
     helper function to cope with lists of variable length
     """
     expr = field.type.expr
-    prefix_str = _c_helper_absolute_name(prefix)
+    prefix_str = _c_helper_fieldaccess_expr(prefix)
     param_fields, wire_fields, params = get_serialize_params('sizeof', self)
     param_names = [p[2] for p in params]
 
@@ -812,6 +1005,14 @@ def _c_serialize_helper_list_field(context, self, field,
 
     # list with variable-sized elements
     if not field.type.member.fixed_size():
+        # compute string for argumentlist for member-type functions
+        member_params = _c_get_additional_type_params(field.type.member)
+        member_arg_names = [p[2] for p in member_params]
+        member_arg_str = ''
+        for member_arg_name in member_arg_names:
+            member_arg_str += ', ' + field_mapping[member_arg_name][0]
+
+        #
         length = ''
         if context in ('unserialize', 'sizeof', 'unpack'):
             int_i = '    unsigned int i;'
@@ -823,8 +1024,8 @@ def _c_serialize_helper_list_field(context, self, field,
             # loop over all list elements and call sizeof repeatedly
             # this should be a bit faster than using the iterators
             code_lines.append("%s    for(i=0; i<%s; i++) {" % (space, list_length))
-            code_lines.append("%s        xcb_tmp_len = %s(xcb_tmp);" %
-                              (space, field.type.c_sizeof_name))
+            code_lines.append("%s        xcb_tmp_len = %s(xcb_tmp%s);" %
+                              (space, field.type.c_sizeof_name, member_arg_str))
             code_lines.append("%s        xcb_block_len += xcb_tmp_len;" % space)
             code_lines.append("%s        xcb_tmp += xcb_tmp_len;" % space)
             code_lines.append("%s    }" % space)
@@ -833,7 +1034,7 @@ def _c_serialize_helper_list_field(context, self, field,
             code_lines.append('%s    xcb_parts[xcb_parts_idx].iov_len = 0;' % space)
             code_lines.append('%s    xcb_tmp = (char *) %s%s;' % (space, prefix_str, field.c_field_name))
             code_lines.append('%s    for(i=0; i<%s; i++) { ' % (space, list_length))
-            code_lines.append('%s        xcb_block_len = %s(xcb_tmp);' % (space, field.type.c_sizeof_name))
+            code_lines.append('%s        xcb_block_len = %s(xcb_tmp%s);' % (space, field.type.c_sizeof_name, member_arg_str))
             code_lines.append('%s        xcb_parts[xcb_parts_idx].iov_len += xcb_block_len;' % space)
             code_lines.append('%s    }' % space)
             code_lines.append('%s    xcb_block_len = xcb_parts[xcb_parts_idx].iov_len;' % space)
@@ -852,7 +1053,7 @@ def _c_serialize_helper_fields_fixed_size(context, self, field,
         typename = reduce(lambda x,y: "%s.%s" % (x, y), scoped_name)
         code_lines.append('%s    /* %s.%s */' % (space, typename, field.c_field_name))
 
-    abs_field_name = _c_helper_absolute_name(prefix, field)
+    abs_field_name = _c_helper_fieldaccess_expr(prefix, field)
     # default for simple cases: call sizeof()
     length = "sizeof(%s)" % field.c_field_type
 
@@ -914,7 +1115,7 @@ def _c_serialize_helper_fields_fixed_size(context, self, field,
 def _c_serialize_helper_fields_variable_size(context, self, field,
                                              code_lines, temp_vars,
                                              space, prefix):
-    prefix_str = _c_helper_absolute_name(prefix)
+    prefix_str = _c_helper_fieldaccess_expr(prefix)
 
     if context in ('unserialize', 'unpack', 'sizeof'):
         value = ''
@@ -971,6 +1172,8 @@ def _c_serialize_helper_fields(context, self,
     need_padding = False
     prev_field_was_variable = False
 
+    _c_pre.push_indent(space + '    ')
+
     for field in self.fields:
         if not field.visible:
             if not ((field.wire and not field.auto) or 'unserialize' == context):
@@ -1000,13 +1203,15 @@ def _c_serialize_helper_fields(context, self,
                 # Variable length pad is <pad align= />
                 code_lines.append('%s    xcb_align_to = %d;' % (space, field.type.align))
                 count += _c_serialize_helper_insert_padding(context, code_lines, space,
-                                                        self.c_var_followed_by_fixed_fields)
+                                                            self.c_var_followed_by_fixed_fields,
+                                                            is_case_or_bitcase)
                 continue
             else:
                 # switch/bitcase: always calculate padding before and after variable sized fields
                 if need_padding or is_case_or_bitcase:
                     count += _c_serialize_helper_insert_padding(context, code_lines, space,
-                                                            self.c_var_followed_by_fixed_fields)
+                                                                self.c_var_followed_by_fixed_fields,
+                                                                is_case_or_bitcase)
 
                 value, length = _c_serialize_helper_fields_variable_size(context, self, field,
                                                                          code_lines, temp_vars,
@@ -1046,12 +1251,19 @@ def _c_serialize_helper_fields(context, self,
             code_lines.append('%s    xcb_parts_idx++;' % space)
             count += 1
 
-        code_lines.append('%s    xcb_align_to = ALIGNOF(%s);' % (space, 'char' if field.c_field_type == 'void' else field.c_field_type))
+        code_lines.append(
+            '%s    xcb_align_to = ALIGNOF(%s);'
+             % (space,
+                 'char'
+                  if field.c_field_type == 'void' or field.type.is_switch
+                  else field.c_field_type))
 
         need_padding = True
         if self.c_var_followed_by_fixed_fields:
             need_padding = False
 
+    _c_pre.pop_indent()
+
     return count
 # _c_serialize_helper_fields()
 
@@ -1090,7 +1302,7 @@ def _c_serialize_helper(context, complex_type,
                                             code_lines, temp_vars,
                                             space, prefix, False)
     # "final padding"
-    count += _c_serialize_helper_insert_padding(context, code_lines, space, False)
+    count += _c_serialize_helper_insert_padding(context, code_lines, space, False, self.is_switch)
 
     return count
 # _c_serialize_helper()
@@ -1150,6 +1362,8 @@ def _c_serialize(context, self):
     temp_vars = []
     prefix = []
 
+    _c_pre.redirect_start(code_lines, temp_vars)
+
     if 'serialize' == context:
         if not self.is_switch and not self.c_var_followed_by_fixed_fields:
             _c('    %s *xcb_out = *_buffer;', self.c_type)
@@ -1160,6 +1374,8 @@ def _c_serialize(context, self):
             _c('    char *xcb_out = *_buffer;')
             _c('    unsigned int xcb_buffer_len = 0;')
             _c('    unsigned int xcb_align_to = 0;')
+        if self.is_switch:
+            _c('    unsigned int xcb_padding_offset = ((size_t)xcb_out) & 7;')
         prefix = [('_aux', '->', self)]
         aux_ptr = 'xcb_out'
 
@@ -1183,6 +1399,8 @@ def _c_serialize(context, self):
         _c('    unsigned int xcb_block_len = 0;')
         _c('    unsigned int xcb_pad = 0;')
         _c('    unsigned int xcb_align_to = 0;')
+        if self.is_switch:
+            _c('    unsigned int xcb_padding_offset = ((size_t)_buffer) & 7;')
 
     elif 'sizeof' == context:
         param_names = [p[2] for p in params]
@@ -1191,15 +1409,19 @@ def _c_serialize(context, self):
             _c('    %s _aux;', self.c_type)
             _c('    return %s(%s, &_aux);', self.c_unpack_name, reduce(lambda x,y: "%s, %s" % (x, y), param_names))
             _c('}')
+            _c_pre.redirect_end()
             return
         elif self.c_var_followed_by_fixed_fields:
             # special case: call _unserialize()
             _c('    return %s(%s, NULL);', self.c_unserialize_name, reduce(lambda x,y: "%s, %s" % (x, y), param_names))
             _c('}')
+            _c_pre.redirect_end()
             return
         else:
             _c('    char *xcb_tmp = (char *)_buffer;')
             prefix = [('_aux', '->', self)]
+            if self.is_switch:
+                _c('    unsigned int xcb_padding_offset = 0;')
 
     count = _c_serialize_helper(context, self, code_lines, temp_vars, prefix=prefix)
     # update variable size fields (only important for context=='serialize'
@@ -1229,6 +1451,8 @@ def _c_serialize(context, self):
             _c('    unsigned int xcb_pad = 0;')
             _c('    unsigned int xcb_align_to = 0;')
 
+    _c_pre.redirect_end()
+
     _c('')
     for t in temp_vars:
         _c(t)
@@ -1321,6 +1545,14 @@ def _c_iterator(self, name):
     _h('    %s *data; /**<  */', self.c_type)
     _h('    int%s rem; /**<  */', ' ' * (len(self.c_type) - 2))
     _h('    int%s index; /**<  */', ' ' * (len(self.c_type) - 2))
+    # add additional params of the type "self" as fields to the iterator struct
+    # so that they can be passed to the sizeof-function by the iterator's next-function
+    params = _c_get_additional_type_params(self)
+    for param in params:
+        _h('    %s%s %s; /**<  */',
+            param[0],
+            ' ' * (len(self.c_type) + 1 - len(param[0])),
+            param[2])
     _h('} %s;', self.c_iterator_type)
 
     _h_setlevel(1)
@@ -1348,9 +1580,14 @@ def _c_iterator(self, name):
             _c('    /* FIXME - determine the size of the union %s */', self.c_type)
         else:
             if self.c_need_sizeof:
+                # compute the string of additional arguments for the sizeof-function
+                additional_args = ''
+                for param in params:
+                    additional_args += ', i->' + param[2]
+
                 _c('    xcb_generic_iterator_t child;')
-                _c('    child.data = (%s *)(((char *)R) + %s(R));',
-                   self.c_type, self.c_sizeof_name)
+                _c('    child.data = (%s *)(((char *)R) + %s(R%s));',
+                   self.c_type, self.c_sizeof_name, additional_args)
                 _c('    i->index = (char *) child.data - (char *) i->data;')
             else:
                 _c('    xcb_generic_iterator_t child = %s;', _c_iterator_get_end(self.last_varsized_field, 'R'))
@@ -1409,12 +1646,7 @@ def _c_accessor_get_length(expr, field_mapping=None):
         if field_mapping is not None:
             lenfield_name = field_mapping[lenfield_name][0]
 
-    if expr.lenfield is not None and expr.lenfield.prev_varsized_field is not None:
-        # special case: variable and fixed size fields are intermixed
-        # if the lenfield is among the fixed size fields, there is no need
-        # to call a special accessor function like <expr.lenfield.c_accessor_name + '(' + prefix + ')'>
-        return field_mapping(expr.lenfield_name)
-    elif expr.lenfield_name is not None:
+    if expr.lenfield_name is not None:
         return lenfield_name
     else:
         return str(expr.nmemb)
@@ -1451,9 +1683,65 @@ def _c_accessor_get_expr(expr, field_mapping):
             raise Exception("list field '%s' referenced by sumof not found" % expr.lenfield_name)
         list_name = field_mapping[field.c_field_name][0]
         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()
+
+        # define and set xcb_listelement, so that it can be used by
+        # listelement-ref expressions.
+        if expr.contains_listelement_ref:
+            _c_pre.code(
+                "const %s *xcb_listelement = %s;",
+                field.c_field_type, listvar)
+
+        # summation
+        if expr.rhs is None:
+            _c_pre.code("%s += *%s;", sumvar, listvar)
+        else:
+            # sumof has a nested expression which has to be evaluated in
+            # the context of this list element
+
+            # field mapping for the subexpression needs to include
+            # the fields of the list-member type
+            scoped_field_mapping = field_mapping.copy()
+            if not field.type.member.is_simple:
+                scoped_field_mapping.update(
+                    _c_helper_field_mapping(
+                        field.type.member,
+                        [(listvar, '->', field.type.member)]))
+
+            # cause pre-code of the subexpression be added right here
+            _c_pre.end()
+            # compute the subexpression
+            rhs_expr_str = _c_accessor_get_expr(expr.rhs, scoped_field_mapping)
+            # resume with our code
+            _c_pre.start()
+            # output the summation expression
+            _c_pre.code("%s += %s;", sumvar, rhs_expr_str)
+
+        _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
+    elif expr.op == 'listelement-ref':
+        return '(*xcb_listelement)'
     elif expr.op != None:
         return ('(' + _c_accessor_get_expr(expr.lhs, field_mapping) +
                 ' ' + expr.op + ' ' +
@@ -1583,6 +1871,29 @@ def _c_accessors_list(self, field):
         # auxiliary object for 'S' parameter
         S_obj = parents[1]
 
+    # for functions generated below:
+    # * compute list of additional parameters which contains as parameter
+    #   any expr fields that cannot be resolved within self and descendants.
+    # * and make sure that they are accessed without prefix within the function.
+    unresolved_fields = resolve_expr_fields_list(list, parents)
+    additional_params = []
+    additional_param_names = set();
+    for f in unresolved_fields:
+        if f.c_field_name not in additional_param_names:
+            # add to the list of additional params
+            additional_params.append((f.c_field_type, f.c_field_name));
+            # make sure that the param is accessed without prefix within the function
+            fields[ f.c_field_name ] = (f.c_field_name, f)
+
+    # internal function to compute the parameterlist with given indentation
+    # such that the formatting of the additional parameters is consistent with
+    # the other parameters.
+    def additional_params_to_str(indent):
+        if len(additional_params) == 0:
+            return ''
+        else:
+            return (',\n' + indent).join([''] + ['%s %s /**< */' % p for p in additional_params])
+
     _h_setlevel(1)
     _c_setlevel(1)
     if list.member.fixed_size():
@@ -1613,31 +1924,32 @@ def _c_accessors_list(self, field):
 
     _hc('')
     _hc('int')
+    spacing = ' '*(len(field.c_length_name)+2)
+    add_param_str = additional_params_to_str(spacing)
     if switch_obj is not None:
         _hc('%s (const %s *R  /**< */,', field.c_length_name, R_obj.c_type)
-        spacing = ' '*(len(field.c_length_name)+2)
-        _h('%sconst %s *S /**< */);', spacing, S_obj.c_type)
-        _c('%sconst %s *S  /**< */)', spacing, S_obj.c_type)
-        length = _c_accessor_get_expr(field.type.expr, fields)
+        _h('%sconst %s *S /**< */%s);', spacing, S_obj.c_type, add_param_str)
+        _c('%sconst %s *S  /**< */%s)', spacing, S_obj.c_type, add_param_str)
     else:
-        _h('%s (const %s *R  /**< */);', field.c_length_name, c_type)
-        _c('%s (const %s *R  /**< */)', field.c_length_name, c_type)
-        length = _c_accessor_get_expr(field.type.expr, fields)
+        _h('%s (const %s *R  /**< */%s);', field.c_length_name, c_type, add_param_str)
+        _c('%s (const %s *R  /**< */%s)', field.c_length_name, c_type, add_param_str)
     _c('{')
+    length = _c_accessor_get_expr(field.type.expr, fields)
     _c('    return %s;', length)
     _c('}')
 
     if field.type.member.is_simple:
         _hc('')
         _hc('xcb_generic_iterator_t')
+        spacing = ' '*(len(field.c_end_name)+2)
+        add_param_str = additional_params_to_str(spacing)
         if switch_obj is not None:
             _hc('%s (const %s *R  /**< */,', field.c_end_name, R_obj.c_type)
-            spacing = ' '*(len(field.c_end_name)+2)
-            _h('%sconst %s *S /**< */);', spacing, S_obj.c_type)
-            _c('%sconst %s *S  /**< */)', spacing, S_obj.c_type)
+            _h('%sconst %s *S /**< */%s);', spacing, S_obj.c_type, add_param_str)
+            _c('%sconst %s *S  /**< */%s)', spacing, S_obj.c_type, add_param_str)
         else:
-            _h('%s (const %s *R  /**< */);', field.c_end_name, c_type)
-            _c('%s (const %s *R  /**< */)', field.c_end_name, c_type)
+            _h('%s (const %s *R  /**< */%s);', field.c_end_name, c_type, add_param_str)
+            _c('%s (const %s *R  /**< */%s)', field.c_end_name, c_type, add_param_str)
         _c('{')
         _c('    xcb_generic_iterator_t i;')
 
@@ -1662,21 +1974,27 @@ def _c_accessors_list(self, field):
     else:
         _hc('')
         _hc('%s', field.c_iterator_type)
+        spacing = ' '*(len(field.c_iterator_name)+2)
+        add_param_str = additional_params_to_str(spacing)
         if switch_obj is not None:
             _hc('%s (const %s *R  /**< */,', field.c_iterator_name, R_obj.c_type)
-            spacing = ' '*(len(field.c_iterator_name)+2)
-            _h('%sconst %s *S /**< */);', spacing, S_obj.c_type)
-            _c('%sconst %s *S  /**< */)', spacing, S_obj.c_type)
+            _h('%sconst %s *S /**< */%s);', spacing, S_obj.c_type, add_param_str)
+            _c('%sconst %s *S  /**< */%s)', spacing, S_obj.c_type, add_param_str)
         else:
-            _h('%s (const %s *R  /**< */);', field.c_iterator_name, c_type)
-            _c('%s (const %s *R  /**< */)', field.c_iterator_name, c_type)
+            _h('%s (const %s *R  /**< */%s);', field.c_iterator_name, c_type, add_param_str)
+            _c('%s (const %s *R  /**< */%s)', field.c_iterator_name, c_type, add_param_str)
         _c('{')
         _c('    %s i;', field.c_iterator_type)
 
+        _c_pre.start()
+        length_expr_str = _c_accessor_get_expr(field.type.expr, fields)
+
         if switch_obj is not None:
+            _c_pre.end()
             _c('    i.data = %s;', fields[field.c_field_name][0])
-            _c('    i.rem = %s;', _c_accessor_get_expr(field.type.expr, fields))
+            _c('    i.rem = %s;', length_expr_str)
         elif field.prev_varsized_field == None:
+            _c_pre.end()
             _c('    i.data = (%s *) (R + 1);', field.c_field_type)
         else:
             (prev_varsized_field, align_pad) = get_align_pad(field)
@@ -1687,12 +2005,20 @@ def _c_accessors_list(self, field):
 
             _c('    xcb_generic_iterator_t prev = %s;',
                 _c_iterator_get_end(prev_varsized_field, 'R'))
+            _c_pre.end()
             _c('    i.data = (%s *) ((char *) prev.data + %s);',
                 field.c_field_type, align_pad)
 
         if switch_obj is None:
-            _c('    i.rem = %s;', _c_accessor_get_expr(field.type.expr, fields))
+            _c('    i.rem = %s;', length_expr_str)
         _c('    i.index = (char *) i.data - (char *) %s;', 'R' if switch_obj is None else 'S' )
+
+        # initialize additional iterator fields which are derived from
+        # additional type parameters for the list member type.
+        additional_iter_fields = _c_get_additional_type_params(field.type.member)
+        for iter_field in additional_iter_fields:
+             _c('    i.%s = %s;', iter_field[2], fields[iter_field[2]][0])
+
         _c('    return i;')
         _c('}')
 
@@ -1708,9 +2034,9 @@ def _c_accessors(self, name, base):
     if True:
         for field in self.fields:
             if not field.type.is_pad:
-                if field.type.is_list and not field.type.fixed_size():
+                if _c_field_needs_list_accessor(field):
                     _c_accessors_list(self, field)
-                elif field.prev_varsized_field is not None or not field.type.fixed_size():
+                elif _c_field_needs_field_accessor(field):
                     _c_accessors_field(self, field)
 
 def c_simple(self, name):
@@ -1778,7 +2104,7 @@ def _c_complex(self, force_packed = False):
         for b in self.bitcases:
             space = ''
             if b.type.has_name:
-                _h('    struct _%s {', b.c_field_name)
+                _h('    struct {')
                 space = '    '
             for field in b.type.fields:
                 _c_complex_field(self, field, space)
@@ -2844,7 +3170,18 @@ def c_event(self, name):
                 force_packed = any(f.type.size == 8 and f.type.is_simple for f in self.fields[(idx+1):])
                 break
 
-    _c_type_setup(self, name, ('event',))
+    if self.name == name:
+        _c_type_setup(self, name, ('event',))
+        # generate accessors
+        # (needed for fields after var-sized fields, for lists with var-sized elements,
+        # switches, ...)
+        _c_accessors(self, name, name)
+    else:
+        # no type-setup needed for eventcopies
+        # (the type-setup of an eventcopy would overwrite members of the original
+        # event, and it would create sizeof-etc funtions which
+        # called undefined accessor functions)
+        pass
 
     # Opcode define
     _c_opcode(name, self.opcodes[name])
@@ -2857,6 +3194,22 @@ def c_event(self, name):
         _h('')
         _h('typedef %s %s;', _t(self.name + ('event',)), _t(name + ('event',)))
 
+        # Create sizeof-function for eventcopies for compatibility reasons
+        if self.c_need_sizeof:
+            _h_setlevel(1)
+            _c_setlevel(1)
+            _h('')
+            _h('int')
+            _h('%s (const void  *_buffer  /**< */);', _n(name + ('sizeof',)))
+            _c('')
+            _c('int')
+            _c('%s (const void  *_buffer  /**< */)', _n(name + ('sizeof',)))
+            _c('{');
+            _c('    return %s(_buffer);', _n(self.name + ('sizeof',)))
+            _c('}');
+            _h_setlevel(0)
+            _c_setlevel(0)
+
     _man_event(self, name)
 
 def c_error(self, name):