codegen/valagsignalmodule.vala

   1 /* valagsignalmodule.vala
   2  *
   3  * Copyright (C) 2006-2010  Jürg Billeter
   4  * Copyright (C) 2006-2008  Raffaele Sandrini
   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  *      Jürg Billeter <j@bitron.ch>
  22  *      Raffaele Sandrini <raffaele@sandrini.ch>
  23  */
  24
  25
  26 public class Vala.GSignalModule : GObjectModule {
  27         string get_marshaller_function (List<Parameter> params, DataType return_type, string? prefix = null) {
  28                 var signature = get_marshaller_signature (params, return_type);
  29                 string ret;
  30
  31                 if (prefix == null) {
  32                         if (predefined_marshal_set.contains (signature)) {
  33                                 prefix = "g_cclosure_marshal";
  34                         } else {
  35                                 prefix = "g_cclosure_user_marshal";
  36                         }
  37                 }
  38
  39                 ret = "%s_%s_".printf (prefix, get_ccode_marshaller_type_name (return_type));
  40
  41                 if (params == null || params.size == 0) {
  42                         ret = ret + "_VOID";
  43                 } else {
  44                         foreach (Parameter p in params) {
  45                                 ret = "%s_%s".printf (ret, get_ccode_marshaller_type_name (p).replace (",", "_"));
  46                         }
  47                 }
  48
  49                 return ret;
  50         }
  51
  52         private string? get_value_type_name_from_type_reference (DataType t) {
  53                 if (t is PointerType || t.type_parameter != null) {
  54                         return "gpointer";
  55                 } else if (t is VoidType) {
  56                         return "void";
  57                 } else if (get_ccode_type_id (t) == get_ccode_type_id (string_type)) {
  58                         return "const char*";
  59                 } else if (t.data_type is Class || t.data_type is Interface) {
  60                         return "gpointer";
  61                 } else if (t is ValueType && t.nullable) {
  62                         return "gpointer";
  63                 } else if (t.data_type is Struct) {
  64                         var st = (Struct) t.data_type;
  65                         if (st.is_simple_type ()) {
  66                                 return get_ccode_name (t.data_type);
  67                         } else {
  68                                 return "gpointer";
  69                         }
  70                 } else if (t.data_type is Enum) {
  71                         return "gint";
  72                 } else if (t is ArrayType) {
  73                         return "gpointer";
  74                 } else if (t is ErrorType) {
  75                         return "gpointer";
  76                 }
  77
  78                 return null;
  79         }
  80
  81         private string? get_value_type_name_from_parameter (Parameter p) {
  82                 if (p.direction != ParameterDirection.IN) {
  83                         return "gpointer";
  84                 } else {
  85                         return get_value_type_name_from_type_reference (p.variable_type);
  86                 }
  87         }
  88
  89         private string get_marshaller_signature (List<Parameter> params, DataType return_type) {
  90                 string signature;
  91
  92                 signature = "%s:".printf (get_ccode_marshaller_type_name (return_type));
  93                 if (params == null || params.size == 0) {
  94                         signature = signature + "VOID";
  95                 } else {
  96                         bool first = true;
  97                         foreach (Parameter p in params) {
  98                                 if (first) {
  99                                         signature = signature + get_ccode_marshaller_type_name (p);
 100                                         first = false;
 101                                 } else {
 102                                         signature = "%s,%s".printf (signature, get_ccode_marshaller_type_name (p));
 103                                 }
 104                         }
 105                 }
 106
 107                 return signature;
 108         }
 109
 110         private CCodeExpression? get_signal_name_cexpression (Signal sig, Expression? detail_expr, CodeNode node) {
 111                 if (detail_expr == null) {
 112                         return get_signal_canonical_constant (sig);
 113                 }
 114
 115                 if (detail_expr.value_type is NullType || !detail_expr.value_type.compatible (string_type)) {
 116                         node.error = true;
 117                         Report.error (detail_expr.source_reference, "only string details are supported");
 118                         return null;
 119                 }
 120
 121                 if (detail_expr is StringLiteral) {
 122                         return get_signal_canonical_constant (sig, ((StringLiteral) detail_expr).eval ());
 123                 }
 124
 125                 var detail_value = create_temp_value (detail_expr.value_type, false, node, true);
 126                 temp_ref_values.insert (0, detail_value);
 127
 128                 var ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_strconcat"));
 129                 ccall.add_argument (get_signal_canonical_constant (sig, ""));
 130                 ccall.add_argument (get_cvalue (detail_expr));
 131                 ccall.add_argument (new CCodeConstant ("NULL"));
 132
 133                 ccode.add_assignment (get_cvalue_ (detail_value), ccall);
 134                 return get_cvalue_ (detail_value);
 135         }
 136
 137         private CCodeExpression get_signal_id_cexpression (Signal sig) {
 138                 var cl = (TypeSymbol) sig.parent_symbol;
 139                 var signal_array = new CCodeIdentifier ("%s_signals".printf (get_ccode_lower_case_name (cl)));
 140                 var signal_enum_value = new CCodeIdentifier ("%s_%s_SIGNAL".printf (get_ccode_upper_case_name (cl), get_ccode_upper_case_name (sig)));
 141
 142                 return new CCodeElementAccess (signal_array, signal_enum_value);
 143         }
 144
 145         private CCodeExpression? get_detail_cexpression (Expression detail_expr, CodeNode node) {
 146                 if (detail_expr.value_type is NullType || !detail_expr.value_type.compatible (string_type)) {
 147                         node.error = true;
 148                         Report.error (detail_expr.source_reference, "only string details are supported");
 149                         return null;
 150                 }
 151
 152                 var detail_cexpr = get_cvalue (detail_expr);
 153                 CCodeFunctionCall detail_ccall;
 154                 if (is_constant_ccode_expression (detail_cexpr)) {
 155                         detail_ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_quark_from_static_string"));
 156                 } else {
 157                         detail_ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_quark_from_string"));
 158                 }
 159                 detail_ccall.add_argument (detail_cexpr);
 160
 161                 return detail_ccall;
 162         }
 163
 164         public override void visit_signal (Signal sig) {
 165                 // parent_symbol may be null for dynamic signals
 166
 167                 var cl = sig.parent_symbol as Class;
 168                 if (cl != null && cl.is_compact) {
 169                         sig.error = true;
 170                         Report.error (sig.source_reference, "Signals are not supported in compact classes");
 171                         return;
 172                 }
 173
 174                 if (cl != null) {
 175                         foreach (DataType base_type in cl.get_base_types ()) {
 176                                 if (SemanticAnalyzer.symbol_lookup_inherited (base_type.data_type, sig.name) is Signal) {
 177                                         sig.error = true;
 178                                         Report.error (sig.source_reference, "Signals with the same name as a signal in a base type are not supported");
 179                                         return;
 180                                 }
 181                         }
 182                 }
 183
 184                 if (signal_enum != null && sig.parent_symbol is TypeSymbol) {
 185                         signal_enum.add_value (new CCodeEnumValue ("%s_%s_SIGNAL".printf (get_ccode_upper_case_name ((TypeSymbol) sig.parent_symbol), get_ccode_upper_case_name (sig))));
 186                 }
 187
 188                 sig.accept_children (this);
 189
 190                 // declare parameter type
 191                 foreach (Parameter p in sig.get_parameters ()) {
 192                         generate_parameter (p, cfile, new HashMap<int,CCodeParameter> (), null);
 193                 }
 194
 195                 generate_marshaller (sig.get_parameters (), sig.return_type);
 196         }
 197
 198         void generate_marshaller (List<Parameter> params, DataType return_type) {
 199                 string signature;
 200                 int n_params, i;
 201
 202                 /* check whether a signal with the same signature already exists for this source file (or predefined) */
 203                 signature = get_marshaller_signature (params, return_type);
 204                 if (predefined_marshal_set.contains (signature) || user_marshal_set.contains (signature)) {
 205                         return;
 206                 }
 207
 208                 var signal_marshaller = new CCodeFunction (get_marshaller_function (params, return_type, null), "void");
 209                 signal_marshaller.modifiers = CCodeModifiers.STATIC;
 210
 211                 signal_marshaller.add_parameter (new CCodeParameter ("closure", "GClosure *"));
 212                 signal_marshaller.add_parameter (new CCodeParameter ("return_value", "GValue *"));
 213                 signal_marshaller.add_parameter (new CCodeParameter ("n_param_values", "guint"));
 214                 signal_marshaller.add_parameter (new CCodeParameter ("param_values", "const GValue *"));
 215                 signal_marshaller.add_parameter (new CCodeParameter ("invocation_hint", "gpointer"));
 216                 signal_marshaller.add_parameter (new CCodeParameter ("marshal_data", "gpointer"));
 217
 218                 push_function (signal_marshaller);
 219
 220                 var callback_decl = new CCodeFunctionDeclarator (get_marshaller_function (params, return_type, "GMarshalFunc"));
 221                 callback_decl.add_parameter (new CCodeParameter ("data1", "gpointer"));
 222                 n_params = 1;
 223                 foreach (Parameter p in params) {
 224                         callback_decl.add_parameter (new CCodeParameter ("arg_%d".printf (n_params), get_value_type_name_from_parameter (p)));
 225                         n_params++;
 226                         if (p.variable_type.is_array ()) {
 227                                 for (var j = 0; j < ((ArrayType) p.variable_type).rank; j++) {
 228                                         callback_decl.add_parameter (new CCodeParameter ("arg_%d".printf (n_params), "gint"));
 229                                         n_params++;
 230                                 }
 231                         }
 232                 }
 233                 callback_decl.add_parameter (new CCodeParameter ("data2", "gpointer"));
 234                 ccode.add_statement (new CCodeTypeDefinition (get_value_type_name_from_type_reference (return_type), callback_decl));
 235
 236                 ccode.add_declaration (get_marshaller_function (params, return_type, "GMarshalFunc"), new CCodeVariableDeclarator ("callback"), CCodeModifiers.REGISTER);
 237
 238                 ccode.add_declaration ("GCClosure *", new CCodeVariableDeclarator ("cc", new CCodeCastExpression (new CCodeIdentifier ("closure"), "GCClosure *")), CCodeModifiers.REGISTER);
 239
 240                 ccode.add_declaration ("gpointer", new CCodeVariableDeclarator ("data1"), CCodeModifiers.REGISTER);
 241                 ccode.add_declaration ("gpointer", new CCodeVariableDeclarator ("data2"), CCodeModifiers.REGISTER);
 242
 243                 CCodeFunctionCall fc;
 244
 245                 if (return_type.data_type != null || return_type.is_array ()) {
 246                         ccode.add_declaration (get_value_type_name_from_type_reference (return_type), new CCodeVariableDeclarator ("v_return"));
 247
 248                         fc = new CCodeFunctionCall (new CCodeIdentifier ("g_return_if_fail"));
 249                         fc.add_argument (new CCodeBinaryExpression (CCodeBinaryOperator.INEQUALITY, new CCodeIdentifier ("return_value"), new CCodeConstant ("NULL")));
 250                         ccode.add_expression (fc);
 251                 }
 252
 253                 fc = new CCodeFunctionCall (new CCodeIdentifier ("g_return_if_fail"));
 254                 fc.add_argument (new CCodeBinaryExpression (CCodeBinaryOperator.EQUALITY, new CCodeIdentifier ("n_param_values"), new CCodeConstant (n_params.to_string())));
 255                 ccode.add_expression (fc);
 256
 257                 var data = new CCodeMemberAccess (new CCodeIdentifier ("closure"), "data", true);
 258                 var param = new CCodeMemberAccess (new CCodeMemberAccess (new CCodeIdentifier ("param_values"), "data[0]", true), "v_pointer");
 259                 var cond = new CCodeFunctionCall (new CCodeConstant ("G_CCLOSURE_SWAP_DATA"));
 260                 cond.add_argument (new CCodeIdentifier ("closure"));
 261                 ccode.open_if (cond);
 262                 ccode.add_assignment (new CCodeIdentifier ("data1"), data);
 263                 ccode.add_assignment (new CCodeIdentifier ("data2"), param);
 264                 ccode.add_else ();
 265                 ccode.add_assignment (new CCodeIdentifier ("data1"), param);
 266                 ccode.add_assignment (new CCodeIdentifier ("data2"), data);
 267                 ccode.close ();
 268
 269                 var c_assign_rhs =  new CCodeCastExpression (new CCodeConditionalExpression (new CCodeIdentifier ("marshal_data"), new CCodeIdentifier ("marshal_data"), new CCodeMemberAccess (new CCodeIdentifier ("cc"), "callback", true)), get_marshaller_function (params, return_type, "GMarshalFunc"));
 270                 ccode.add_assignment (new CCodeIdentifier ("callback"), c_assign_rhs);
 271
 272                 fc = new CCodeFunctionCall (new CCodeIdentifier ("callback"));
 273                 fc.add_argument (new CCodeIdentifier ("data1"));
 274                 i = 1;
 275                 foreach (Parameter p in params) {
 276                         string get_value_function;
 277                         bool is_array = p.variable_type.is_array ();
 278                         if (p.direction != ParameterDirection.IN) {
 279                                 get_value_function = "g_value_get_pointer";
 280                         } else if (is_array) {
 281                                 if (((ArrayType) p.variable_type).element_type.data_type == string_type.data_type) {
 282                                         get_value_function = "g_value_get_boxed";
 283                                 } else {
 284                                         get_value_function = "g_value_get_pointer";
 285                                 }
 286                         } else if (p.variable_type is PointerType || p.variable_type.type_parameter != null) {
 287                                 get_value_function = "g_value_get_pointer";
 288                         } else if (p.variable_type is ErrorType) {
 289                                 get_value_function = "g_value_get_pointer";
 290                         } else if (p.variable_type is ValueType && p.variable_type.nullable) {
 291                                 get_value_function = "g_value_get_pointer";
 292                         } else {
 293                                 get_value_function = get_ccode_get_value_function (p.variable_type.data_type);
 294                         }
 295                         var inner_fc = new CCodeFunctionCall (new CCodeIdentifier (get_value_function));
 296                         inner_fc.add_argument (new CCodeBinaryExpression (CCodeBinaryOperator.PLUS, new CCodeIdentifier ("param_values"), new CCodeIdentifier (i.to_string ())));
 297                         fc.add_argument (inner_fc);
 298                         i++;
 299                         if (is_array) {
 300                                 for (var j = 0; j < ((ArrayType) p.variable_type).rank; j++) {
 301                                         inner_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_get_int"));
 302                                         inner_fc.add_argument (new CCodeBinaryExpression (CCodeBinaryOperator.PLUS, new CCodeIdentifier ("param_values"), new CCodeIdentifier (i.to_string ())));
 303                                         fc.add_argument (inner_fc);
 304                                         i++;
 305                                 }
 306                         }
 307                 }
 308                 fc.add_argument (new CCodeIdentifier ("data2"));
 309
 310                 if (return_type.data_type != null || return_type.is_array ()) {
 311                         ccode.add_assignment (new CCodeIdentifier ("v_return"), fc);
 312
 313                         CCodeFunctionCall set_fc;
 314                         if (return_type.is_array ()) {
 315                                 if (((ArrayType) return_type).element_type.data_type == string_type.data_type) {
 316                                         set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_take_boxed"));
 317                                 } else {
 318                                         set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_set_pointer"));
 319                                 }
 320                         } else if (return_type.type_parameter != null) {
 321                                 set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_set_pointer"));
 322                         } else if (return_type is ErrorType) {
 323                                 set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_set_pointer"));
 324                         } else if (return_type.data_type == string_type.data_type) {
 325                                 set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_take_string"));
 326                         } else if (return_type.data_type is Class || return_type.data_type is Interface) {
 327                                 set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_take_object"));
 328                         } else if (return_type is ValueType && return_type.nullable) {
 329                                 set_fc = new CCodeFunctionCall (new CCodeIdentifier ("g_value_set_pointer"));
 330                         } else {
 331                                 set_fc = new CCodeFunctionCall (new CCodeIdentifier (get_ccode_set_value_function (return_type.data_type)));
 332                         }
 333                         set_fc.add_argument (new CCodeIdentifier ("return_value"));
 334                         set_fc.add_argument (new CCodeIdentifier ("v_return"));
 335
 336                         ccode.add_expression (set_fc);
 337                 } else {
 338                         ccode.add_expression (fc);
 339                 }
 340
 341                 pop_function ();
 342
 343                 cfile.add_function_declaration (signal_marshaller);
 344                 cfile.add_function (signal_marshaller);
 345                 user_marshal_set.add (signature);
 346         }
 347
 348         public override CCodeExpression get_signal_creation (Signal sig, TypeSymbol type) {
 349                 var csignew = new CCodeFunctionCall (new CCodeIdentifier ("g_signal_new"));
 350                 csignew.add_argument (new CCodeConstant ("\"%s\"".printf (get_ccode_name (sig))));
 351                 csignew.add_argument (new CCodeIdentifier (get_ccode_type_id (type)));
 352                 string[] flags = new string[0];
 353                 var run_type = sig.get_attribute_string ("Signal", "run");
 354                 if (run_type == "first") {
 355                         flags += "G_SIGNAL_RUN_FIRST";
 356                 } else if (run_type == "cleanup") {
 357                         flags += "G_SIGNAL_RUN_CLEANUP";
 358                 } else {
 359                         flags += "G_SIGNAL_RUN_LAST";
 360                 }
 361                 if (sig.get_attribute_bool ("Signal", "detailed")) {
 362                         flags += "G_SIGNAL_DETAILED";
 363                 }
 364
 365                 if (sig.get_attribute_bool ("Signal", "no_recurse")) {
 366                         flags += "G_SIGNAL_NO_RECURSE";
 367                 }
 368
 369                 if (sig.get_attribute_bool ("Signal", "action")) {
 370                         flags += "G_SIGNAL_ACTION";
 371                 }
 372
 373                 if (sig.get_attribute_bool ("Signal", "no_hooks")) {
 374                         flags += "G_SIGNAL_NO_HOOKS";
 375                 }
 376
 377                 if (sig.version.deprecated) {
 378                         flags += "G_SIGNAL_DEPRECATED";
 379                 }
 380
 381                 csignew.add_argument (new CCodeConstant (string.joinv (" | ", flags)));
 382
 383                 if (sig.default_handler == null) {
 384                         csignew.add_argument (new CCodeConstant ("0"));
 385                 } else {
 386                         var struct_offset = new CCodeFunctionCall (new CCodeIdentifier ("G_STRUCT_OFFSET"));
 387                         if (type is Class) {
 388                                 struct_offset.add_argument (new CCodeIdentifier ("%sClass".printf (get_ccode_name (type))));
 389                         } else {
 390                                 // interface
 391                                 struct_offset.add_argument (new CCodeIdentifier (get_ccode_type_name ((Interface) type)));
 392                         }
 393                         struct_offset.add_argument (new CCodeIdentifier (get_ccode_vfunc_name (sig.default_handler)));
 394                         csignew.add_argument (struct_offset);
 395                 }
 396                 csignew.add_argument (new CCodeConstant ("NULL"));
 397                 csignew.add_argument (new CCodeConstant ("NULL"));
 398
 399                 string marshaller = get_marshaller_function (sig.get_parameters (), sig.return_type);
 400
 401                 var marshal_arg = new CCodeIdentifier (marshaller);
 402                 csignew.add_argument (marshal_arg);
 403
 404                 var params = sig.get_parameters ();
 405                 if (sig.return_type is PointerType || sig.return_type.type_parameter != null) {
 406                         csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 407                 } else if (sig.return_type is ErrorType) {
 408                         csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 409                 } else if (sig.return_type is ValueType && sig.return_type.nullable) {
 410                         csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 411                 } else if (sig.return_type.data_type == null) {
 412                         csignew.add_argument (new CCodeConstant ("G_TYPE_NONE"));
 413                 } else {
 414                         csignew.add_argument (new CCodeConstant (get_ccode_type_id (sig.return_type.data_type)));
 415                 }
 416
 417                 int params_len = 0;
 418                 foreach (Parameter param in params) {
 419                         params_len++;
 420                         if (param.variable_type.is_array ()) {
 421                                 params_len += ((ArrayType) param.variable_type).rank;
 422                         }
 423                 }
 424
 425                 csignew.add_argument (new CCodeConstant ("%d".printf (params_len)));
 426                 foreach (Parameter param in params) {
 427                         if (param.variable_type.is_array ()) {
 428                                 if (((ArrayType) param.variable_type).element_type.data_type == string_type.data_type) {
 429                                         csignew.add_argument (new CCodeConstant ("G_TYPE_STRV"));
 430                                 } else {
 431                                         csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 432                                 }
 433                                 for (var i = 0; i < ((ArrayType) param.variable_type).rank; i++) {
 434                                         csignew.add_argument (new CCodeConstant ("G_TYPE_INT"));
 435                                 }
 436                         } else if (param.variable_type is PointerType || param.variable_type.type_parameter != null || param.direction != ParameterDirection.IN) {
 437                                 csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 438                         } else if (param.variable_type is ErrorType) {
 439                                 csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 440                         } else if (param.variable_type is ValueType && param.variable_type.nullable) {
 441                                 csignew.add_argument (new CCodeConstant ("G_TYPE_POINTER"));
 442                         } else {
 443                                 csignew.add_argument (new CCodeConstant (get_ccode_type_id (param.variable_type.data_type)));
 444                         }
 445                 }
 446
 447                 marshal_arg.name = marshaller;
 448
 449                 return new CCodeAssignment (get_signal_id_cexpression (sig), csignew);
 450         }
 451
 452         public override void visit_element_access (ElementAccess expr) {
 453                 if (expr.container is MemberAccess && expr.container.symbol_reference is Signal) {
 454                         if (expr.parent_node is MethodCall) {
 455                                 // detailed signal emission
 456                                 var sig = (Signal) expr.symbol_reference;
 457                                 var ma = (MemberAccess) expr.container;
 458
 459                                 var detail_expr = expr.get_indices ().get (0);
 460
 461                                 CCodeFunctionCall ccall;
 462                                 if (!sig.external_package && expr.source_reference.file == sig.source_reference.file) {
 463                                         var detail_cexpr = get_detail_cexpression (detail_expr, expr);
 464
 465                                         ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_signal_emit"));
 466                                         ccall.add_argument (get_cvalue (ma.inner));
 467                                         ccall.add_argument (get_signal_id_cexpression (sig));
 468                                         if (detail_cexpr != null) {
 469                                                 ccall.add_argument (detail_cexpr);
 470                                         }
 471                                 } else {
 472                                         var signal_name_cexpr = get_signal_name_cexpression (sig, detail_expr, expr);
 473
 474                                         ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_signal_emit_by_name"));
 475                                         ccall.add_argument (get_cvalue (ma.inner));
 476                                         if (signal_name_cexpr != null) {
 477                                                 ccall.add_argument (signal_name_cexpr);
 478                                         }
 479                                 }
 480
 481                                 set_cvalue (expr, ccall);
 482                         } else {
 483                                 // signal connect or disconnect
 484                         }
 485                 } else {
 486                         base.visit_element_access (expr);
 487                 }
 488         }
 489
 490         bool in_gobject_instance (Method m) {
 491                 bool result = false;
 492                 if (m.binding == MemberBinding.INSTANCE) {
 493                         result = m.this_parameter.variable_type.data_type.is_subtype_of (gobject_type);
 494                 }
 495                 return result;
 496         }
 497
 498         void emit_signal_assignment (Assignment assignment) {
 499                 var sig = (Signal) assignment.left.symbol_reference;
 500
 501                 bool disconnect = false;
 502
 503                 if (assignment.operator == AssignmentOperator.ADD) {
 504                         // connect
 505                 } else if (assignment.operator == AssignmentOperator.SUB) {
 506                         // disconnect
 507                         disconnect = true;
 508                 } else {
 509                         assignment.error = true;
 510                         Report.error (assignment.source_reference, "Specified compound assignment type for signals not supported.");
 511                         return;
 512                 }
 513
 514                 connect_signal (sig, assignment.left, assignment.right, disconnect, false, assignment);
 515         }
 516
 517         public override void visit_assignment (Assignment assignment) {
 518                 if (assignment.left.symbol_reference is Signal) {
 519                         if (assignment.left.error || assignment.right.error) {
 520                                 assignment.error = true;
 521                                 return;
 522                         }
 523
 524                         emit_signal_assignment (assignment);
 525                 } else {
 526                         base.visit_assignment (assignment);
 527                 }
 528         }
 529
 530         public override void visit_member_access (MemberAccess expr) {
 531                 if (expr.symbol_reference is Signal) {
 532                         CCodeExpression pub_inst = null;
 533
 534                         if (expr.inner != null) {
 535                                 pub_inst = get_cvalue (expr.inner);
 536                         }
 537
 538                         var sig = (Signal) expr.symbol_reference;
 539                         var cl = (TypeSymbol) sig.parent_symbol;
 540
 541                         if (expr.inner is BaseAccess && sig.is_virtual) {
 542                                 var m = sig.default_handler;
 543                                 var base_class = (Class) m.parent_symbol;
 544                                 var vcast = new CCodeFunctionCall (new CCodeIdentifier ("%s_CLASS".printf (get_ccode_upper_case_name (base_class, null))));
 545                                 vcast.add_argument (new CCodeIdentifier ("%s_parent_class".printf (get_ccode_lower_case_name (current_class))));
 546
 547                                 set_cvalue (expr, new CCodeMemberAccess.pointer (vcast, m.name));
 548                                 return;
 549                         }
 550
 551                         if (!sig.external_package && expr.source_reference.file == sig.source_reference.file) {
 552                                 var ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_signal_emit"));
 553                                 ccall.add_argument (pub_inst);
 554                                 ccall.add_argument (get_signal_id_cexpression (sig));
 555                                 ccall.add_argument (new CCodeConstant ("0"));
 556
 557                                 set_cvalue (expr, ccall);
 558                         } else if (get_signal_has_emitter (sig)) {
 559                                 string emitter_func;
 560                                 if (sig.emitter != null) {
 561                                         if (!sig.external_package && expr.source_reference.file != sig.source_reference.file) {
 562                                                 generate_method_declaration (sig.emitter, cfile);
 563                                         }
 564                                         emitter_func = get_ccode_lower_case_name (sig.emitter);
 565                                 } else {
 566                                         emitter_func = "%s_%s".printf (get_ccode_lower_case_name (cl), get_ccode_lower_case_name (sig));
 567                                 }
 568                                 var ccall = new CCodeFunctionCall (new CCodeIdentifier (emitter_func));
 569
 570                                 ccall.add_argument (pub_inst);
 571                                 set_cvalue (expr, ccall);
 572                         } else {
 573                                 var ccall = new CCodeFunctionCall (new CCodeIdentifier ("g_signal_emit_by_name"));
 574                                 ccall.add_argument (pub_inst);
 575
 576                                 ccall.add_argument (get_signal_canonical_constant (sig));
 577
 578                                 set_cvalue (expr, ccall);
 579                         }
 580                 } else {
 581                         base.visit_member_access (expr);
 582                 }
 583         }
 584
 585         public override void visit_method_call (MethodCall expr) {
 586                 var method_type = expr.call.value_type as MethodType;
 587
 588                 if (method_type == null || !(method_type.method_symbol.parent_symbol is Signal)) {
 589                         // no signal connect/disconnect call
 590                         base.visit_method_call (expr);
 591                         return;
 592                 }
 593
 594                 var sig = (Signal) method_type.method_symbol.parent_symbol;
 595                 var signal_access = ((MemberAccess) expr.call).inner;
 596                 var handler = expr.get_argument_list ().get (0);
 597
 598                 bool disconnect = (method_type.method_symbol.name == "disconnect");
 599                 bool after = (method_type.method_symbol.name == "connect_after");
 600
 601                 var cexpr = connect_signal (sig, signal_access, handler, disconnect, after, expr);
 602                 set_cvalue (expr, cexpr);
 603         }
 604
 605         CCodeExpression? connect_signal (Signal sig, Expression signal_access, Expression handler, bool disconnect, bool after, CodeNode expr) {
 606                 string connect_func;
 607
 608                 var m = (Method) handler.symbol_reference;
 609
 610                 if (!disconnect) {
 611                         // connect
 612                         if (sig is DynamicSignal) {
 613                                 if (!after)
 614                                         connect_func = get_dynamic_signal_connect_wrapper_name ((DynamicSignal) sig);
 615                                 else
 616                                         connect_func = get_dynamic_signal_connect_after_wrapper_name ((DynamicSignal) sig);
 617                         } else {
 618                                 if (m.closure) {
 619                                         connect_func = "g_signal_connect_data";
 620                                 } else if (in_gobject_instance (m)) {
 621                                         connect_func = "g_signal_connect_object";
 622                                 } else if (!after) {
 623                                         connect_func = "g_signal_connect";
 624                                 } else
 625                                         connect_func = "g_signal_connect_after";
 626                         }
 627                 } else {
 628                         // disconnect
 629                         if (handler is LambdaExpression) {
 630                                 Report.error (handler.source_reference, "Cannot disconnect lambda expression from signal. Use Object.disconnect.");
 631                         }
 632                         if (sig is DynamicSignal) {
 633                                 connect_func = get_dynamic_signal_disconnect_wrapper_name ((DynamicSignal) sig);
 634                         } else {
 635                                 connect_func = "g_signal_handlers_disconnect_matched";
 636                         }
 637                 }
 638
 639                 var ccall = new CCodeFunctionCall (new CCodeIdentifier (connect_func));
 640
 641                 CCodeExpression signal_name_cexpr = null;
 642
 643                 // first argument: instance of sender
 644                 MemberAccess ma;
 645                 if (signal_access is ElementAccess) {
 646                         var ea = (ElementAccess) signal_access;
 647                         ma = (MemberAccess) ea.container;
 648                         var detail_expr = ea.get_indices ().get (0);
 649                         signal_name_cexpr = get_signal_name_cexpression (sig, detail_expr, expr);
 650                         if (signal_name_cexpr == null) {
 651                                 return null;
 652                         }
 653                 } else {
 654                         ma = (MemberAccess) signal_access;
 655                         signal_name_cexpr = get_signal_name_cexpression (sig, null, expr);
 656                 }
 657                 if (ma.inner != null) {
 658                         ccall.add_argument ((CCodeExpression) get_ccodenode (ma.inner));
 659                 } else {
 660                         ccall.add_argument (get_result_cexpression ("self"));
 661                 }
 662
 663                 if (sig is DynamicSignal) {
 664                         // dynamic_signal_connect or dynamic_signal_disconnect
 665
 666                         // second argument: signal name
 667                         ccall.add_argument (new CCodeConstant ("\"%s\"".printf (get_ccode_name (sig))));
 668                 } else if (!disconnect) {
 669                         // g_signal_connect_object or g_signal_connect
 670
 671                         // second argument: signal name
 672                         ccall.add_argument (signal_name_cexpr);
 673                 } else {
 674                         // g_signal_handlers_disconnect_matched
 675
 676                         // second argument: mask
 677                         if (!(signal_access is ElementAccess)) {
 678                                 ccall.add_argument (new CCodeConstant ("G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA"));
 679                         } else {
 680                                 ccall.add_argument (new CCodeConstant ("G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DETAIL | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA"));
 681                         }
 682
 683                         // get signal id
 684                         var temp_decl = get_temp_variable (uint_type);
 685                         emit_temp_var (temp_decl);
 686                         var parse_call = new CCodeFunctionCall (new CCodeIdentifier ("g_signal_parse_name"));
 687                         parse_call.add_argument (signal_name_cexpr);
 688                         var decl_type = (TypeSymbol) sig.parent_symbol;
 689                         parse_call.add_argument (new CCodeIdentifier (get_ccode_type_id (decl_type)));
 690                         parse_call.add_argument (new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, get_variable_cexpression (temp_decl.name)));
 691                         LocalVariable? detail_temp_decl = null;
 692                         if (!(signal_access is ElementAccess)) {
 693                                 parse_call.add_argument (new CCodeConstant ("NULL"));
 694                                 parse_call.add_argument (new CCodeConstant ("FALSE"));
 695                         } else {
 696                                 detail_temp_decl = get_temp_variable (gquark_type);
 697                                 emit_temp_var (detail_temp_decl);
 698                                 parse_call.add_argument (new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, get_variable_cexpression (detail_temp_decl.name)));
 699                                 parse_call.add_argument (new CCodeConstant ("TRUE"));
 700                         }
 701                         ccode.add_expression (parse_call);
 702
 703                         // third argument: signal_id
 704                         ccall.add_argument (get_variable_cexpression (temp_decl.name));
 705
 706                         // fourth argument: detail
 707                         if (detail_temp_decl == null) {
 708                                 ccall.add_argument (new CCodeConstant ("0"));
 709                         } else {
 710                                 ccall.add_argument (get_variable_cexpression (detail_temp_decl.name));
 711                         }
 712                         // fifth argument: closure
 713                         ccall.add_argument (new CCodeConstant ("NULL"));
 714                 }
 715
 716                 // third resp. sixth argument: handler
 717                 ccall.add_argument (new CCodeCastExpression (get_cvalue (handler), "GCallback"));
 718
 719                 if (m.closure) {
 720                         // g_signal_connect_data
 721
 722                         // fourth argument: user_data
 723                         CCodeExpression handler_destroy_notify;
 724                         ccall.add_argument (get_delegate_target_cexpression (handler, out handler_destroy_notify));
 725
 726                         // fifth argument: destroy_notify
 727                         ccall.add_argument (new CCodeCastExpression (handler_destroy_notify, "GClosureNotify"));
 728
 729                         // sixth argument: connect_flags
 730                         if (!after)
 731                                 ccall.add_argument (new CCodeConstant ("0"));
 732                         else
 733                                 ccall.add_argument (new CCodeConstant ("G_CONNECT_AFTER"));
 734                 } else if (m.binding == MemberBinding.INSTANCE) {
 735                         // g_signal_connect_object or g_signal_handlers_disconnect_matched
 736                         // or dynamic_signal_connect or dynamic_signal_disconnect
 737
 738                         // fourth resp. seventh argument: object/user_data
 739                         if (handler is MemberAccess) {
 740                                 var right_ma = (MemberAccess) handler;
 741                                 if (right_ma.inner != null) {
 742                                         ccall.add_argument (get_cvalue (right_ma.inner));
 743                                 } else {
 744                                         ccall.add_argument (get_result_cexpression ("self"));
 745                                 }
 746                         } else if (handler is LambdaExpression) {
 747                                 ccall.add_argument (get_result_cexpression ("self"));
 748                         }
 749                         if (!disconnect && !(sig is DynamicSignal)
 750                             && in_gobject_instance (m)) {
 751                                 // g_signal_connect_object
 752
 753                                 // fifth argument: connect_flags
 754                                 if (!after)
 755                                         ccall.add_argument (new CCodeConstant ("0"));
 756                                 else
 757                                         ccall.add_argument (new CCodeConstant ("G_CONNECT_AFTER"));
 758                         }
 759                 } else {
 760                         // g_signal_connect or g_signal_connect_after or g_signal_handlers_disconnect_matched
 761                         // or dynamic_signal_connect or dynamic_signal_disconnect
 762
 763                         // fourth resp. seventh argument: user_data
 764                         ccall.add_argument (new CCodeConstant ("NULL"));
 765                 }
 766
 767                 if (disconnect || expr.parent_node is ExpressionStatement) {
 768                         ccode.add_expression (ccall);
 769                         return null;
 770                 } else {
 771                         var temp_var = get_temp_variable (ulong_type);
 772                         var temp_ref = get_variable_cexpression (temp_var.name);
 773
 774                         emit_temp_var (temp_var);
 775
 776                         ccode.add_assignment (temp_ref, ccall);
 777
 778                         return temp_ref;
 779                 }
 780         }
 781 }
 782