vala/valausedattr.vala

   1 /* valaunusedattr.vala
   2  *
   3  * Copyright (C) 2014-2015  Jürg Billeter
   4  * Copyright (C) 2014-2015  Luca Bruno
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19  *
  20  * Author:
  21  *      Luca Bruno <lucabru@src.gnome.org>
  22  */
  23
  24 using GLib;
  25
  26 /**
  27  * Code visitor to warn about unused attributes
  28  */
  29 public class Vala.UsedAttr : CodeVisitor {
  30         public Vala.Map<string,Vala.Set<string>> marked = new HashMap<string,Vala.Set<string>> (str_hash, str_equal);
  31
  32         const string[] valac_default_attrs = {
  33                 "CCode", "type_signature", "default_value", "set_value_function", "type_id", "cprefix", "cheader_filename",
  34                 "marshaller_type_name", "get_value_function", "cname", "destroy_function", "lvalue_access",
  35                 "has_type_id", "instance_pos", "const_cname", "take_value_function", "copy_function", "free_function",
  36                 "param_spec_function", "has_target", "type_cname", "ref_function", "ref_function_void", "unref_function", "type",
  37                 "has_construct_function", "returns_floating_reference", "gir_namespace", "gir_version", "construct_function",
  38                 "lower_case_cprefix", "simple_generics", "sentinel", "scope", "has_destroy_function", "ordering", "type_check_function",
  39                 "has_copy_function", "lower_case_csuffix", "ref_sink_function", "dup_function", "finish_function", "generic_type_pos",
  40                 "array_length_type", "array_length", "array_length_cname", "array_length_cexpr", "array_null_terminated",
  41                 "vfunc_name", "finish_vfunc_name", "finish_name", "free_function_address_of", "pos", "delegate_target", "delegate_target_cname",
  42                 "array_length_pos", "delegate_target_pos", "destroy_notify_pos", "ctype", "has_new_function", "notify", "finish_instance",
  43                 "use_inplace", "",
  44
  45                 "Immutable", "",
  46                 "Compact", "",
  47                 "NoWrapper", "",
  48                 "NoThrow", "",
  49                 "DestroysInstance", "",
  50                 "Flags", "",
  51                 "Experimental", "", // deprecated
  52                 "NoReturn", "",
  53                 "NoArrayLength", "", // deprecated
  54                 "Assert", "",
  55                 "ErrorBase", "",
  56                 "GenericAccessors", "",
  57                 "Diagnostics", "",
  58                 "NoAccessorMethod", "",
  59                 "ConcreteAccessor", "",
  60                 "HasEmitter", "",
  61                 "ReturnsModifiedPointer", "",
  62                 "Deprecated", "since", "replacement", "", // deprecated
  63                 "Version", "since", "replacement", "deprecated", "deprecated_since", "experimental", "experimental_until", "",
  64                 "Signal", "detailed", "run", "no_recurse", "action", "no_hooks", "",
  65                 "Description", "nick", "blurb", "",
  66
  67                 "IntegerType", "rank", "min", "max", "signed", "width", "",
  68                 "FloatingType", "rank", "decimal", "width", "",
  69                 "BooleanType", "",
  70                 "SimpleType", "",
  71                 "PointerType", "",
  72
  73                 "Print", "",
  74                 "PrintfFormat", "",
  75                 "ScanfFormat", "",
  76                 "FormatArg", "",
  77
  78                 "GtkChild", "name", "internal", "",
  79                 "GtkTemplate", "ui", "",
  80                 "GtkCallback", "name", "",
  81
  82                 "ModuleInit", "",
  83
  84                 "DBus", "name", "no_reply", "result", "use_string_marshalling", "value", "signature", "visible", "timeout", "",
  85
  86                 "GIR", "fullname", "name", ""
  87
  88         };
  89
  90         public UsedAttr () {
  91                 // mark default valac attrs
  92                 var curattr = "";
  93                 foreach (unowned string val in valac_default_attrs) {
  94                         if (val == "") {
  95                                 curattr = "";
  96                         } else {
  97                                 if (curattr == "") {
  98                                         curattr = val;
  99                                         mark (curattr, null);
 100                                 } else {
 101                                         mark (curattr, val);
 102                                 }
 103                         }
 104                 }
 105         }
 106
 107         /**
 108          * Mark the attribute or attribute argument as used by the compiler
 109          */
 110         public void mark (string attribute, string? argument) {
 111                 var set = marked.get (attribute);
 112                 if (set == null) {
 113                         set = new HashSet<string> (str_hash, str_equal);
 114                         marked.set (attribute, set);
 115                 }
 116
 117                 if (argument != null) {
 118                         set.add (argument);
 119                 }
 120         }
 121
 122         /**
 123          * Traverse the code tree and warn about unused attributes.
 124          *
 125          * @param context a code context
 126          */
 127         public void check_unused (CodeContext context) {
 128                 context.root.accept (this);
 129         }
 130
 131         void check_unused_attr (Symbol sym) {
 132                 // optimize by not looking at all the symbols
 133                 if (sym.used) {
 134                         foreach (unowned Attribute attr in sym.attributes) {
 135                                 var set = marked.get (attr.name);
 136                                 if (set == null) {
 137                                         Report.warning (attr.source_reference, "attribute `%s' never used".printf (attr.name));
 138                                 } else {
 139                                         foreach (var arg in attr.args.get_keys()) {
 140                                                 if (!set.contains (arg)) {
 141                                                         Report.warning (attr.source_reference, "argument `%s' never used".printf (arg));
 142                                                 }
 143                                         }
 144                                 }
 145                         }
 146                 }
 147         }
 148
 149         public override void visit_namespace (Namespace ns) {
 150                 check_unused_attr (ns);
 151                 ns.accept_children (this);
 152         }
 153
 154         public override void visit_class (Class cl) {
 155                 check_unused_attr (cl);
 156                 cl.accept_children (this);
 157         }
 158
 159         public override void visit_struct (Struct st) {
 160                 check_unused_attr (st);
 161                 st.accept_children (this);
 162         }
 163
 164         public override void visit_interface (Interface iface) {
 165                 check_unused_attr (iface);
 166                 iface.accept_children (this);
 167         }
 168
 169         public override void visit_enum (Enum en) {
 170                 check_unused_attr (en);
 171                 en.accept_children (this);
 172         }
 173
 174         public override void visit_error_domain (ErrorDomain ed) {
 175                 check_unused_attr (ed);
 176                 ed.accept_children (this);
 177         }
 178
 179         public override void visit_delegate (Delegate cb) {
 180                 check_unused_attr (cb);
 181                 cb.accept_children (this);
 182         }
 183
 184         public override void visit_constant (Constant c) {
 185                 check_unused_attr (c);
 186         }
 187
 188         public override void visit_field (Field f) {
 189                 check_unused_attr (f);
 190         }
 191
 192         public override void visit_method (Method m) {
 193                 check_unused_attr (m);
 194                 m.accept_children (this);
 195         }
 196
 197         public override void visit_creation_method (CreationMethod m) {
 198                 check_unused_attr (m);
 199                 m.accept_children (this);
 200         }
 201
 202         public override void visit_formal_parameter (Parameter p) {
 203                 check_unused_attr (p);
 204         }
 205
 206         public override void visit_property (Property prop) {
 207                 check_unused_attr (prop);
 208         }
 209
 210         public override void visit_signal (Signal sig) {
 211                 check_unused_attr (sig);
 212                 sig.accept_children (this);
 213         }
 214 }