+def _c_field_mapping(context, complex_type):
+ def get_prefix(field):
+ prefix = ''
+ if context in ('serialize', 'unserialize'):
+ if field.type.fixed_size() or complex_type.is_switch:
+ prefix = '_aux->'
+ else:
+ raise Exception("unknown context '%s' in c_field_mapping" % context)
+ return prefix
+ # get_prefix()
+ def get_field_name(fields, complex_type, prefix=''):
+ for f in complex_type.fields:
+ if '' == prefix:
+ prefix = get_prefix(f)
+
+ fname = "%s%s" % (prefix, f.c_field_name)
+ if fields.has_key(f.field_name):
+ continue
+ raise Exception("field name %s has been registered before" % f.field_name)
+ fields[f.field_name] = (fname, f)
+ if f.type.is_container:
+ new_prefix = "%s%s" % (prefix, f.c_field_name)
+ new_prefix += "." if f.type.is_switch else "->"
+ get_field_name(fields, f.type, new_prefix)
+ # get_field_name()
+
+ # dict(field_name : (c_field_name, field))
+ fields = {}
+ get_field_name(fields, complex_type)
+
+ # switch: get the fields referenced by the switch expr as well
+ # these may not belong to any structure
+ if complex_type.is_switch:
+ pass
+# FIXME: fields += get_serialize_params(context, complex_type)
+
+ return fields
+# _c_field_mapping()
+
+def _c_serialize_helper_prefix(prefix):
+ prefix_str = prefix
+ lenfield_prefix = "_aux"
+ if prefix != '':
+ prefix_str += "->"
+ lenfield_prefix += "->%s" % prefix
+ return (prefix_str, lenfield_prefix)
+# _c_serialize_helper_prefix
+
+def _c_serialize_helper_insert_padding(context, code_lines, space):
+ code_lines.append('%s xcb_buffer_len += xcb_block_len;' % space)
+ code_lines.append('%s /* padding */' % space)
+ code_lines.append('%s xcb_pad = -xcb_block_len & 3;' % space)
+ code_lines.append('%s if (0 != xcb_pad) {' % space)
+
+ if 'serialize' == context:
+ code_lines.append('%s xcb_parts[xcb_parts_idx].iov_base = xcb_pad0;' % space)
+ code_lines.append('%s xcb_parts[xcb_parts_idx].iov_len = xcb_pad;' % space)
+ code_lines.append('%s xcb_parts_idx++;' % space)
+ elif 'unserialize' == context:
+ code_lines.append('%s xcb_tmp += xcb_pad;' % space)
+
+ code_lines.append('%s xcb_buffer_len += xcb_pad;' % space)
+ code_lines.append('%s xcb_pad = 0;' % space)
+ code_lines.append('%s }' % space)
+ code_lines.append('%s xcb_block_len = 0;' % space)
+
+ return 1
+# _c_serialize_helper_insert_padding()
+
+def _c_serialize_helper_switch(context, self, complex_name,
+ code_lines, temp_vars,
+ space, prefix):
+ count = 0
+ prefix_str, lenfield_prefix = _c_serialize_helper_prefix(prefix)
+ switch_expr = _c_accessor_get_expr(self.expr)
+
+ for b in self.bitcases:
+ bitcase_expr = _c_accessor_get_expr(b.type.expr, prefix)
+ code_lines.append(' if(%s & %s) {' % (switch_expr, bitcase_expr))
+
+ _c_serialize_helper_fields(context, b.type,
+ code_lines, temp_vars,
+ space="%s " % space,
+ prefix="%s%s" % (prefix_str, complex_name),
+ is_bitcase = True)
+ code_lines.append(' }')
+
+ if 'serialize' == context:
+ count = _c_serialize_helper_insert_padding(context, code_lines, space)
+ if 'unserialize' == context:
+ # padding
+ code_lines.append('%s xcb_pad = -xcb_block_len & 3;' % space)
+ code_lines.append('%s xcb_buffer_len += xcb_block_len + xcb_pad;' % space)
+
+ return count
+# _c_serialize_helper_switch
+
+def _c_serialize_helper_switch_field(self, field):
+ # switch is handled by this function as a special case
+ args = get_switch_expr_fields(field.type)
+ field_mapping = _c_field_mapping('unserialize', self)
+ c_field_names = ''
+ for a in args:
+ c_field_names += "%s, " % field_mapping[a.field_name][0]
+ switch_field_name = field_mapping[field.field_name][0]
+ length = "%s(xcb_tmp, %s&%s)" % (field.type.c_unserialize_name,
+ c_field_names, switch_field_name)
+ return length
+# _c_serialize_helper_switch_field()
+
+def _c_serialize_helper_list_field(context, self, field,
+ code_lines, temp_vars,
+ space, prefix):
+ """
+ helper function for (un)serialize to cope with lists of variable length
+ """
+ expr = field.type.expr
+ prefix_str, lenfield_prefix = _c_serialize_helper_prefix(prefix)
+ param_fields, wire_fields, params = get_serialize_params('unserialize', self)
+ param_names = [p[2] for p in params]
+
+ # look if the list's lenfield is a struct member or a function argument
+ # special case: if the list has a length field, its name will returned
+ # unchanged by calling c_accessor_get_length(expr)
+ if expr.lenfield_name == _c_accessor_get_length(expr):
+ if expr.lenfield_name in param_names:
+ # the length field appears as separate argument in unserialize,
+ # so no need for a prefix
+ lenfield_prefix = ''
+ list_length = _c_accessor_get_expr(expr, lenfield_prefix)
+
+ # default: list with fixed size elements
+ length = '%s * sizeof(%s)' % (list_length, field.type.member.c_wiretype)
+ # list with variable-sized elements
+ if field.type.size is None:
+ length = ''
+ if 'unserialize' == context:
+ temp_vars.add(' unsigned int i;')
+ temp_vars.add(' unsigned int xcb_tmp_len;')
+ 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_unserialize_name))
+ 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)
+ elif 'serialize' == context:
+ 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, _c_accessor_get_expr(expr, lenfield_prefix)))
+ code_lines.append('%s xcb_block_len = %s(xcb_tmp);' % (space, field.type.c_unserialize_name))
+ 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)
+
+ return length
+# _c_serialize_helper_list_field()
+
+def _c_serialize_helper_fields_fixed_size(context, self, field,
+ code_lines, temp_vars,
+ space, prefix):
+ prefix_str, lenfield_prefix = _c_serialize_helper_prefix(prefix)
+ code_lines.append('%s /* %s.%s */' % (space, self.c_type, field.c_field_name))
+
+ length = "sizeof(%s)" % field.c_field_type
+
+ if 'unserialize' == context:
+ value = ' _aux->%s = *(%s *)xcb_tmp;' % (field.c_field_name, field.c_field_type)
+ # FIXME? - lists
+ if field.type.is_list:
+ raise Exception('list with fixed number of elemens unhandled in _unserialize()')
+ elif 'serialize' == context:
+ value = ' xcb_parts[xcb_parts_idx].iov_base = (char *) '
+
+ if field.type.is_expr:
+ # need to register a temporary variable for the expression
+ if field.type.c_type is None:
+ raise Exception("type for field '%s' (expression '%s') unkown" %
+ (field.field_name, _c_accessor_get_expr(field.type.expr)))
+ temp_vars.add(' %s xcb_expr_%s = %s;' % (field.type.c_type, field.field_name,
+ _c_accessor_get_expr(field.type.expr, prefix)))
+ value += "&xcb_expr_%s;" % field.field_name
+
+ elif field.type.is_pad:
+ if field.type.nmemb == 1:
+ value += "&xcb_pad;"
+ else:
+ value = ' memset(xcb_parts[xcb_parts_idx].iov_base, 0, %d);' % field.type.nmemb
+ length += "*%d" % field.type.nmemb
+
+ else:
+ # non-list type with fixed size
+ if field.type.nmemb == 1:
+ value += "&%s%s;" % (prefix_str, field.c_field_name)
+ # list with nmemb (fixed size) elements
+ else:
+ value += '%s%s;' % (prefix_str, field.c_field_name)
+ length = '%d' % field.type.nmemb
+
+ return (value, length)
+# _c_serialize_helper_fields_fixed_size()
+
+def _c_serialize_helper_fields_variable_size(context, self, field,
+ code_lines, temp_vars,
+ space, prefix):
+ prefix_str, lenfield_prefix = _c_serialize_helper_prefix(prefix)
+
+ if 'unserialize' == context:
+ value = ''
+ elif 'serialize' == context:
+ value = ' xcb_parts[xcb_parts_idx].iov_base = (char *) %s%s;' % (prefix_str, field.c_field_name)
+ length = ''
+
+ prefix_str, lenfield_prefix = _c_serialize_helper_prefix(prefix)
+ code_lines.append('%s /* %s */' % (space, field.c_field_name))
+
+ if field.type.is_list:
+ length = _c_serialize_helper_list_field(context, self, field,
+ code_lines, temp_vars,
+ space, prefix)
+ elif field.type.is_switch:
+ length = _c_serialize_helper_switch_field(self, field)
+ else:
+ length = "%s(xcb_tmp)" % (field.type.c_unserialize_name)
+
+ return (value, length)
+# _c_serialize_helper_fields_variable_size
+
+def _c_serialize_helper_fields(context, self,
+ code_lines, temp_vars,
+ space, prefix, is_bitcase):
+ count = 0
+ need_padding = False
+ prefix_str, lenfield_prefix = _c_serialize_helper_prefix(prefix)
+
+ for field in self.fields:
+ if not ((field.wire and not field.auto) or field.visible):
+ continue
+
+ # switch/bitcase: fixed size fields must be considered explicitly
+ if field.type.fixed_size():
+ if is_bitcase:
+ value, length = _c_serialize_helper_fields_fixed_size(context, self, field,
+ code_lines, temp_vars,
+ space, prefix)
+ else:
+ continue
+
+ # fields with variable size
+ else:
+ # switch/bitcase: always calculate padding before and after variable sized fields
+ if need_padding or is_bitcase:
+ _c_serialize_helper_insert_padding(context, code_lines, space)
+
+ value, length = _c_serialize_helper_fields_variable_size(context, self, field,
+ code_lines, temp_vars,
+ space, prefix)
+
+ # save (un)serialization C code
+ if '' != value:
+ code_lines.append('%s%s' % (space, value))
+ if field.type.fixed_size() and is_bitcase:
+ code_lines.append('%s xcb_block_len += %s;' % (space, length))
+ if 'unserialize' == context:
+ code_lines.append('%s xcb_tmp += %s;' % (space, length))
+ else:
+ # padding
+ if '' != length:
+ code_lines.append('%s xcb_block_len = %s;' % (space, length))
+ if 'unserialize' == context:
+ code_lines.append('%s xcb_tmp += xcb_block_len;' % space)
+ if 'serialize' == context:
+ if '' != length:
+ code_lines.append('%s xcb_parts[xcb_parts_idx].iov_len = xcb_block_len;' % space)
+ code_lines.append('%s xcb_parts_idx++;' % space)
+ count += 1
+ need_padding = True
+
+ return count
+# _c_serialize_helper_fields()
+
+def _c_serialize_helper(context, complex_type,
+ code_lines, temp_vars,
+ space='', prefix=''):
+ count = 0
+ if hasattr(complex_type, 'type'):
+ self = complex_type.type
+ complex_name = complex_type.name
+ else:
+ self = complex_type
+ complex_name = '_aux'
+
+ # special case: switch is serialized by evaluating each bitcase separately
+ if self.is_switch:
+ count += _c_serialize_helper_switch(context, self, complex_name,
+ code_lines, temp_vars,
+ space, prefix)
+
+ # all other data types can be evaluated one field a time
+ else:
+ # unserialize & fixed size fields: simply cast the buffer to the respective xcb_out type
+ if 'unserialize' == context:
+ code_lines.append('%s xcb_block_len += sizeof(%s);' % (space, self.c_type))
+ code_lines.append('%s xcb_tmp += xcb_block_len;' % space)
+ _c_serialize_helper_insert_padding(context, code_lines, space)
+
+ count += _c_serialize_helper_fields(context, self,
+ code_lines, temp_vars,
+ space, prefix, False)
+ # "final padding"
+ count += _c_serialize_helper_insert_padding(context, code_lines, space)
+
+ return count
+# _c_serialize_helper()
+