1 /* Perform the semantic phase of parsing, i.e., the process of
2 building tree structure, checking semantic consistency, and
3 building RTL. These routines are used both during actual parsing
4 and during the instantiation of template functions.
6 Copyright (C) 1998, 1999 Free Software Foundation, Inc.
7 Written by Mark Mitchell (mmitchell@usa.net) based on code found
8 formerly in parse.y and pt.c.
10 This file is part of GNU CC.
12 GNU CC is free software; you can redistribute it and/or modify it
13 under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2, or (at your option)
17 GNU CC is distributed in the hope that it will be useful, but
18 WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with GNU CC; see the file COPYING. If not, write to the Free
24 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
35 /* There routines provide a modular interface to perform many parsing
36 operations. They may therefore be used during actual parsing, or
37 during template instantiation, which may be regarded as a
38 degenerate form of parsing. Since the current g++ parser is
39 lacking in several respects, and will be reimplemented, we are
40 attempting to move most code that is not directly related to
41 parsing into this file; that will make implementing the new parser
42 much easier since it will be able to make use of these routines. */
44 /* When parsing a template, LAST_TREE contains the last statement
45 parsed. These are chained together through the TREE_CHAIN field,
46 but often need to be re-organized since the parse is performed
47 bottom-up. This macro makes LAST_TREE the indicated SUBSTMT of
50 #define RECHAIN_STMTS(stmt, substmt, last) \
53 TREE_CHAIN (stmt) = NULL_TREE; \
57 #define RECHAIN_STMTS_FROM_LAST(stmt, substmt) \
58 RECHAIN_STMTS (stmt, substmt, last_tree)
60 #define RECHAIN_STMTS_FROM_CHAIN(stmt, substmt) \
61 RECHAIN_STMTS (stmt, substmt, TREE_CHAIN (stmt))
63 /* Finish an expression-statement, whose EXPRESSION is as indicated. */
66 finish_expr_stmt (expr
)
69 if (expr
!= NULL_TREE
)
71 if (!processing_template_decl
)
73 emit_line_note (input_filename
, lineno
);
74 /* Do default conversion if safe and possibly important,
75 in case within ({...}). */
76 if ((TREE_CODE (TREE_TYPE (expr
)) == ARRAY_TYPE
78 || TREE_CODE (TREE_TYPE (expr
)) == FUNCTION_TYPE
)
79 expr
= default_conversion (expr
);
82 cplus_expand_expr_stmt (expr
);
89 /* Begin an if-statement. Returns a newly created IF_STMT if
97 if (processing_template_decl
)
99 r
= build_min_nt (IF_STMT
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
110 /* Process the COND of an if-statement, which may be given by
114 finish_if_stmt_cond (cond
, if_stmt
)
118 if (processing_template_decl
)
120 if (last_tree
!= if_stmt
)
121 RECHAIN_STMTS_FROM_LAST (if_stmt
, IF_COND (if_stmt
));
123 IF_COND (if_stmt
) = copy_to_permanent (cond
);
127 emit_line_note (input_filename
, lineno
);
128 expand_start_cond (condition_conversion (cond
), 0);
132 /* Finish the then-clause of an if-statement, which may be given by
136 finish_then_clause (if_stmt
)
139 if (processing_template_decl
)
141 RECHAIN_STMTS_FROM_CHAIN (if_stmt
,
142 THEN_CLAUSE (if_stmt
));
150 /* Begin the else-clause of an if-statement. */
155 if (!processing_template_decl
)
156 expand_start_else ();
159 /* Finish the else-clause of an if-statement, which may be given by
163 finish_else_clause (if_stmt
)
166 if (processing_template_decl
)
167 RECHAIN_STMTS_FROM_CHAIN (if_stmt
, ELSE_CLAUSE (if_stmt
));
170 /* Finsh an if-statement. */
175 if (!processing_template_decl
)
182 /* Begin a while-statement. Returns a newly created WHILE_STMT if
190 if (processing_template_decl
)
192 r
= build_min_nt (WHILE_STMT
, NULL_TREE
, NULL_TREE
);
198 emit_line_note (input_filename
, lineno
);
199 expand_start_loop (1);
208 /* Process the COND of an if-statement, which may be given by
212 finish_while_stmt_cond (cond
, while_stmt
)
216 if (processing_template_decl
)
218 if (last_tree
!= while_stmt
)
219 RECHAIN_STMTS_FROM_LAST (while_stmt
,
220 WHILE_COND (while_stmt
));
222 TREE_OPERAND (while_stmt
, 0) = copy_to_permanent (cond
);
226 emit_line_note (input_filename
, lineno
);
227 expand_exit_loop_if_false (0, condition_conversion (cond
));
230 /* If COND wasn't a declaration, clear out the
231 block we made for it and start a new one here so the
232 optimization in expand_end_loop will work. */
233 if (getdecls () == NULL_TREE
)
240 /* Finish a while-statement, which may be given by WHILE_STMT. */
243 finish_while_stmt (while_stmt
)
248 if (processing_template_decl
)
249 RECHAIN_STMTS_FROM_CHAIN (while_stmt
, WHILE_BODY (while_stmt
));
255 /* Begin a do-statement. Returns a newly created DO_STMT if
261 if (processing_template_decl
)
263 tree r
= build_min_nt (DO_STMT
, NULL_TREE
, NULL_TREE
);
270 emit_line_note (input_filename
, lineno
);
271 expand_start_loop_continue_elsewhere (1);
276 /* Finish the body of a do-statement, which may be given by DO_STMT. */
279 finish_do_body (do_stmt
)
282 if (processing_template_decl
)
283 RECHAIN_STMTS_FROM_CHAIN (do_stmt
, DO_BODY (do_stmt
));
285 expand_loop_continue_here ();
288 /* Finish a do-statement, which may be given by DO_STMT, and whose
289 COND is as indicated. */
292 finish_do_stmt (cond
, do_stmt
)
296 if (processing_template_decl
)
297 DO_COND (do_stmt
) = copy_to_permanent (cond
);
300 emit_line_note (input_filename
, lineno
);
301 expand_exit_loop_if_false (0, condition_conversion (cond
));
309 /* Finish a return-statement. The EXPRESSION returned, if any, is as
313 finish_return_stmt (expr
)
316 emit_line_note (input_filename
, lineno
);
317 c_expand_return (expr
);
321 /* Begin a for-statement. Returns a new FOR_STMT if appropriate. */
328 if (processing_template_decl
)
330 r
= build_min_nt (FOR_STMT
, NULL_TREE
, NULL_TREE
,
331 NULL_TREE
, NULL_TREE
);
337 if (flag_new_for_scope
> 0)
340 note_level_for_for ();
346 /* Finish the for-init-statement of a for-statement, which may be
347 given by FOR_STMT. */
350 finish_for_init_stmt (for_stmt
)
353 if (processing_template_decl
)
355 if (last_tree
!= for_stmt
)
356 RECHAIN_STMTS_FROM_CHAIN (for_stmt
, FOR_INIT_STMT (for_stmt
));
361 emit_line_note (input_filename
, lineno
);
362 expand_start_loop_continue_elsewhere (1);
368 /* Finish the COND of a for-statement, which may be given by
372 finish_for_cond (cond
, for_stmt
)
376 if (processing_template_decl
)
378 if (last_tree
!= for_stmt
)
379 RECHAIN_STMTS_FROM_LAST (for_stmt
, FOR_COND (for_stmt
));
381 FOR_COND (for_stmt
) = copy_to_permanent (cond
);
385 emit_line_note (input_filename
, lineno
);
387 expand_exit_loop_if_false (0, condition_conversion (cond
));
390 /* If the cond wasn't a declaration, clear out the
391 block we made for it and start a new one here so the
392 optimization in expand_end_loop will work. */
393 if (getdecls () == NULL_TREE
)
400 /* Finish the increment-EXPRESSION in a for-statement, which may be
401 given by FOR_STMT. */
404 finish_for_expr (expr
, for_stmt
)
408 if (processing_template_decl
)
409 FOR_EXPR (for_stmt
) = expr
;
411 /* Don't let the tree nodes for EXPR be discarded
412 by clear_momentary during the parsing of the next stmt. */
416 /* Finish the body of a for-statement, which may be given by
417 FOR_STMT. The increment-EXPR for the loop must be
421 finish_for_stmt (expr
, for_stmt
)
425 /* Pop the scope for the body of the loop. */
428 if (processing_template_decl
)
429 RECHAIN_STMTS_FROM_CHAIN (for_stmt
, FOR_BODY (for_stmt
));
432 emit_line_note (input_filename
, lineno
);
433 expand_loop_continue_here ();
435 cplus_expand_expr_stmt (expr
);
441 if (flag_new_for_scope
> 0)
447 /* Finish a break-statement. */
452 emit_line_note (input_filename
, lineno
);
453 if (processing_template_decl
)
454 add_tree (build_min_nt (BREAK_STMT
));
455 else if ( ! expand_exit_something ())
456 cp_error ("break statement not within loop or switch");
459 /* Finish a continue-statement. */
462 finish_continue_stmt ()
464 emit_line_note (input_filename
, lineno
);
465 if (processing_template_decl
)
466 add_tree (build_min_nt (CONTINUE_STMT
));
467 else if (! expand_continue_loop (0))
468 cp_error ("continue statement not within a loop");
471 /* Begin a switch-statement. */
479 /* Finish the cond of a switch-statement. Returns a new
480 SWITCH_STMT if appropriate. */
483 finish_switch_cond (cond
)
488 if (processing_template_decl
)
490 r
= build_min_nt (SWITCH_STMT
, cond
, NULL_TREE
);
493 else if (cond
!= error_mark_node
)
495 emit_line_note (input_filename
, lineno
);
496 c_expand_start_case (cond
);
501 /* The code is in error, but we don't want expand_end_case to
503 c_expand_start_case (boolean_false_node
);
509 /* Don't let the tree nodes for COND be discarded by
510 clear_momentary during the parsing of the next stmt. */
516 /* Finish the body of a switch-statement, which may be given by
517 SWITCH_STMT. The COND to switch on is indicated. */
520 finish_switch_stmt (cond
, switch_stmt
)
524 if (processing_template_decl
)
525 RECHAIN_STMTS_FROM_CHAIN (switch_stmt
, SWITCH_BODY (switch_stmt
));
527 expand_end_case (cond
);
534 /* Finish a case-label. */
537 finish_case_label (low_value
, high_value
)
541 do_case (low_value
, high_value
);
545 /* Finish a goto-statement. */
548 finish_goto_stmt (destination
)
551 if (processing_template_decl
)
552 add_tree (build_min_nt (GOTO_STMT
, destination
));
555 emit_line_note (input_filename
, lineno
);
557 if (TREE_CODE (destination
) == IDENTIFIER_NODE
)
559 tree decl
= lookup_label (destination
);
560 TREE_USED (decl
) = 1;
564 expand_computed_goto (destination
);
568 /* Begin a try-block. Returns a newly-created TRY_BLOCK if
574 if (processing_template_decl
)
576 tree r
= build_min_nt (TRY_BLOCK
, NULL_TREE
,
583 emit_line_note (input_filename
, lineno
);
584 expand_start_try_stmts ();
589 /* Finish a try-block, which may be given by TRY_BLOCK. */
592 finish_try_block (try_block
)
595 if (processing_template_decl
)
596 RECHAIN_STMTS_FROM_LAST (try_block
, TRY_STMTS (try_block
));
599 expand_start_all_catch ();
603 /* Finish a handler-sequence for a try-block, which may be given by
607 finish_handler_sequence (try_block
)
610 if (processing_template_decl
)
611 RECHAIN_STMTS_FROM_CHAIN (try_block
, TRY_HANDLERS (try_block
));
614 expand_end_all_catch ();
618 /* Begin a handler. Returns a HANDLER if appropriate. */
625 if (processing_template_decl
)
627 r
= build_min_nt (HANDLER
, NULL_TREE
, NULL_TREE
);
638 /* Finish the handler-parameters for a handler, which may be given by
642 finish_handler_parms (handler
)
645 if (processing_template_decl
)
646 RECHAIN_STMTS_FROM_CHAIN (handler
, HANDLER_PARMS (handler
));
649 /* Finish a handler, which may be given by HANDLER. */
652 finish_handler (handler
)
655 if (processing_template_decl
)
656 RECHAIN_STMTS_FROM_CHAIN (handler
, HANDLER_BODY (handler
));
658 expand_end_catch_block ();
663 /* Begin a compound-statement. If HAS_NO_SCOPE is non-zero, the
664 compound-statement does not define a scope. Returns a new
665 COMPOUND_STMT if appropriate. */
668 begin_compound_stmt (has_no_scope
)
673 if (processing_template_decl
)
675 r
= build_min_nt (COMPOUND_STMT
, NULL_TREE
);
678 COMPOUND_STMT_NO_SCOPE (r
) = 1;
690 /* Finish a compound-statement, which may be given by COMPOUND_STMT.
691 If HAS_NO_SCOPE is non-zero, the compound statement does not define
695 finish_compound_stmt (has_no_scope
, compound_stmt
)
706 if (processing_template_decl
)
707 RECHAIN_STMTS_FROM_CHAIN (compound_stmt
,
708 COMPOUND_BODY (compound_stmt
));
715 /* Finish an asm-statement, whose components are a CV_QUALIFIER, a
716 STRING, some OUTPUT_OPERANDS, some INPUT_OPERANDS, and some
720 finish_asm_stmt (cv_qualifier
, string
, output_operands
,
721 input_operands
, clobbers
)
724 tree output_operands
;
728 if (TREE_CHAIN (string
))
730 if (processing_template_decl
)
732 /* We need to build the combined string on the permanent
733 obstack so that we can use it during instantiations. */
734 push_obstacks_nochange ();
735 end_temporary_allocation ();
738 string
= combine_strings (string
);
740 if (processing_template_decl
)
744 if (processing_template_decl
)
746 tree r
= build_min_nt (ASM_STMT
, cv_qualifier
, string
,
747 output_operands
, input_operands
,
753 emit_line_note (input_filename
, lineno
);
754 if (output_operands
!= NULL_TREE
|| input_operands
!= NULL_TREE
755 || clobbers
!= NULL_TREE
)
759 if (cv_qualifier
!= NULL_TREE
760 && cv_qualifier
!= ridpointers
[(int) RID_VOLATILE
])
761 cp_warning ("%s qualifier ignored on asm",
762 IDENTIFIER_POINTER (cv_qualifier
));
764 for (t
= input_operands
; t
; t
= TREE_CHAIN (t
))
765 TREE_VALUE (t
) = decay_conversion (TREE_VALUE (t
));
767 c_expand_asm_operands (string
, output_operands
,
771 == ridpointers
[(int) RID_VOLATILE
],
772 input_filename
, lineno
);
776 /* Don't warn about redundant specification of 'volatile' here. */
777 if (cv_qualifier
!= NULL_TREE
778 && cv_qualifier
!= ridpointers
[(int) RID_VOLATILE
])
779 cp_warning ("%s qualifier ignored on asm",
780 IDENTIFIER_POINTER (cv_qualifier
));
788 /* Finish a parenthesized expression EXPR. */
791 finish_parenthesized_expr (expr
)
794 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (expr
))))
795 /* This inhibits warnings in truthvalue_conversion. */
796 C_SET_EXP_ORIGINAL_CODE (expr
, ERROR_MARK
);
801 /* Begin a statement-expression. The value returned must be passed to
808 /* If we're processing_template_decl, then the upcoming compound
809 statement will be chained onto the tree structure, starting at
810 last_tree. We return last_tree so that we can later unhook the
811 compound statement. */
812 return processing_template_decl
? last_tree
: expand_start_stmt_expr();
815 /* Finish a statement-expression. RTL_EXPR should be the value
816 returned by the previous begin_stmt_expr; EXPR is the
817 statement-expression. Returns an expression representing the
818 statement-expression. */
821 finish_stmt_expr (rtl_expr
, expr
)
827 if (!processing_template_decl
)
829 rtl_expr
= expand_end_stmt_expr (rtl_expr
);
830 /* The statements have side effects, so the group does. */
831 TREE_SIDE_EFFECTS (rtl_expr
) = 1;
834 if (TREE_CODE (expr
) == BLOCK
)
836 /* Make a BIND_EXPR for the BLOCK already made. */
837 if (processing_template_decl
)
838 result
= build_min_nt (BIND_EXPR
, NULL_TREE
, last_tree
,
841 result
= build (BIND_EXPR
, TREE_TYPE (rtl_expr
),
842 NULL_TREE
, rtl_expr
, expr
);
844 /* Remove the block from the tree at this point.
845 It gets put back at the proper place
846 when the BIND_EXPR is expanded. */
852 if (processing_template_decl
)
854 /* Remove the compound statement from the tree structure; it is
855 now saved in the BIND_EXPR. */
856 last_tree
= rtl_expr
;
857 TREE_CHAIN (last_tree
) = NULL_TREE
;
863 /* Finish a call to FN with ARGS. Returns a representation of the
867 finish_call_expr (fn
, args
, koenig
)
876 if (TREE_CODE (fn
) == BIT_NOT_EXPR
)
877 fn
= build_x_unary_op (BIT_NOT_EXPR
, TREE_OPERAND (fn
, 0));
878 else if (TREE_CODE (fn
) != TEMPLATE_ID_EXPR
)
879 fn
= do_identifier (fn
, 2, args
);
881 result
= build_x_function_call (fn
, args
, current_class_ref
);
883 if (TREE_CODE (result
) == CALL_EXPR
884 && (! TREE_TYPE (result
)
885 || TREE_CODE (TREE_TYPE (result
)) != VOID_TYPE
))
886 result
= require_complete_type (result
);
891 /* Finish a call to a postfix increment or decrement or EXPR. (Which
892 is indicated by CODE, which should be POSTINCREMENT_EXPR or
893 POSTDECREMENT_EXPR.) */
896 finish_increment_expr (expr
, code
)
900 /* If we get an OFFSET_REF, turn it into what it really means (e.g.,
901 a COMPONENT_REF). This way if we've got, say, a reference to a
902 static member that's being operated on, we don't end up trying to
903 find a member operator for the class it's in. */
905 if (TREE_CODE (expr
) == OFFSET_REF
)
906 expr
= resolve_offset_ref (expr
);
907 return build_x_unary_op (code
, expr
);
910 /* Finish a use of `this'. Returns an expression for `this'. */
917 if (current_class_ptr
)
919 #ifdef WARNING_ABOUT_CCD
920 TREE_USED (current_class_ptr
) = 1;
922 result
= current_class_ptr
;
924 else if (current_function_decl
925 && DECL_STATIC_FUNCTION_P (current_function_decl
))
927 error ("`this' is unavailable for static member functions");
928 result
= error_mark_node
;
932 if (current_function_decl
)
933 error ("invalid use of `this' in non-member function");
935 error ("invalid use of `this' at top level");
936 result
= error_mark_node
;
942 /* Finish a member function call using OBJECT and ARGS as arguments to
943 FN. Returns an expression for the call. */
946 finish_object_call_expr (fn
, object
, args
)
952 /* This is a future direction of this code, but because
953 build_x_function_call cannot always undo what is done in
954 build_component_ref entirely yet, we cannot do this. */
956 tree real_fn
= build_component_ref (object
, fn
, NULL_TREE
, 1);
957 return finish_call_expr (real_fn
, args
);
959 if (TREE_CODE (fn
) == TYPE_DECL
)
961 if (processing_template_decl
)
962 /* This can happen on code like:
965 template <class T> void f(T t) {
969 We just grab the underlying IDENTIFIER. */
973 cp_error ("calling type `%T' like a method", fn
);
974 return error_mark_node
;
978 return build_method_call (object
, fn
, args
, NULL_TREE
, LOOKUP_NORMAL
);
982 /* Finish a qualified member function call using OBJECT and ARGS as
983 arguments to FN. Returns an expressino for the call. */
986 finish_qualified_object_call_expr (fn
, object
, args
)
991 if (IS_SIGNATURE (TREE_OPERAND (fn
, 0)))
993 warning ("signature name in scope resolution ignored");
994 return finish_object_call_expr (TREE_OPERAND (fn
, 1), object
, args
);
997 return build_scoped_method_call (object
, TREE_OPERAND (fn
, 0),
998 TREE_OPERAND (fn
, 1), args
);
1001 /* Finish a pseudo-destructor call expression of OBJECT, with SCOPE
1002 being the scope, if any, of DESTRUCTOR. Returns an expression for
1006 finish_pseudo_destructor_call_expr (object
, scope
, destructor
)
1011 if (scope
&& scope
!= destructor
)
1012 cp_error ("destructor specifier `%T::~%T()' must have matching names",
1015 if ((scope
== NULL_TREE
|| IDENTIFIER_GLOBAL_VALUE (destructor
))
1016 && (TREE_CODE (TREE_TYPE (object
)) !=
1017 TREE_CODE (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (destructor
)))))
1018 cp_error ("`%E' is not of type `%T'", object
, destructor
);
1020 return cp_convert (void_type_node
, object
);
1023 /* Finish a call to a globally qualified member function FN using
1024 ARGS. Returns an expression for the call. */
1027 finish_qualified_call_expr (fn
, args
)
1031 if (processing_template_decl
)
1032 return build_min_nt (CALL_EXPR
, copy_to_permanent (fn
), args
,
1035 return build_member_call (TREE_OPERAND (fn
, 0),
1036 TREE_OPERAND (fn
, 1),
1040 /* Finish an expression taking the address of LABEL. Returns an
1041 expression for the address. */
1044 finish_label_address_expr (label
)
1049 label
= lookup_label (label
);
1050 if (label
== NULL_TREE
)
1051 result
= null_pointer_node
;
1054 TREE_USED (label
) = 1;
1055 result
= build1 (ADDR_EXPR
, ptr_type_node
, label
);
1056 TREE_CONSTANT (result
) = 1;
1062 /* Finish an expression of the form CODE EXPR. */
1065 finish_unary_op_expr (code
, expr
)
1066 enum tree_code code
;
1069 tree result
= build_x_unary_op (code
, expr
);
1070 if (code
== NEGATE_EXPR
&& TREE_CODE (expr
) == INTEGER_CST
)
1071 TREE_NEGATED_INT (result
) = 1;
1072 overflow_warning (result
);
1076 /* Finish an id-expression. */
1079 finish_id_expr (expr
)
1082 if (TREE_CODE (expr
) == IDENTIFIER_NODE
)
1083 expr
= do_identifier (expr
, 1, NULL_TREE
);
1088 /* Begin a new-placement. */
1091 begin_new_placement ()
1093 /* The arguments to a placement new might be passed to a
1094 deallocation function, in the event that the allocation throws an
1095 exception. Since we don't expand exception handlers until the
1096 end of a function, we must make sure the arguments stay around
1098 return suspend_momentary ();
1101 /* Finish a new-placement. The ARGS are the placement arguments. The
1102 COOKIE is the value returned by the previous call to
1103 begin_new_placement. */
1106 finish_new_placement (args
, cookie
)
1110 resume_momentary (cookie
);
1114 /* Begin a function defniition declared with DECL_SPECS and
1115 DECLARATOR. Returns non-zero if the function-declaration is
1119 begin_function_definition (decl_specs
, declarator
)
1125 split_specs_attrs (decl_specs
, &specs
, &attrs
);
1126 if (!start_function (specs
, declarator
, attrs
, 0))
1129 reinit_parse_for_function ();
1130 /* The things we're about to see are not directly qualified by any
1131 template headers we've seen thus far. */
1132 reset_specialization ();
1137 /* Begin a constructor declarator of the form `SCOPE::NAME'. Returns
1141 begin_constructor_declarator (scope
, name
)
1145 tree result
= build_parse_node (SCOPE_REF
, scope
, name
);
1146 enter_scope_of (result
);
1150 /* Finish an init-declarator. Returns a DECL. */
1153 finish_declarator (declarator
, declspecs
, attributes
,
1154 prefix_attributes
, initialized
)
1158 tree prefix_attributes
;
1161 return start_decl (declarator
, declspecs
, initialized
, attributes
,
1165 /* Finish a translation unit. */
1168 finish_translation_unit ()
1170 /* In case there were missing closebraces,
1171 get us back to the global binding level. */
1172 while (! toplevel_bindings_p ())
1174 while (current_namespace
!= global_namespace
)
1179 /* Finish a template type parameter, specified as AGGR IDENTIFIER.
1180 Returns the parameter. */
1183 finish_template_type_parm (aggr
, identifier
)
1187 if (aggr
== signature_type_node
)
1188 sorry ("signature as template type parameter");
1189 else if (aggr
!= class_type_node
)
1191 pedwarn ("template type parameters must use the keyword `class' or `typename'");
1192 aggr
= class_type_node
;
1195 return build_tree_list (aggr
, identifier
);
1198 /* Finish a template template parameter, specified as AGGR IDENTIFIER.
1199 Returns the parameter. */
1202 finish_template_template_parm (aggr
, identifier
)
1206 tree decl
= build_decl (TYPE_DECL
, identifier
, NULL_TREE
);
1207 tree tmpl
= build_lang_decl (TEMPLATE_DECL
, identifier
, NULL_TREE
);
1208 DECL_TEMPLATE_PARMS (tmpl
) = current_template_parms
;
1209 DECL_TEMPLATE_RESULT (tmpl
) = decl
;
1210 SET_DECL_ARTIFICIAL (decl
);
1211 end_template_decl ();
1213 return finish_template_type_parm (aggr
, tmpl
);
1216 /* Finish a parameter list, indicated by PARMS. If ELLIPSIS is
1217 non-zero, the parameter list was terminated by a `...'. */
1220 finish_parmlist (parms
, ellipsis
)
1225 chainon (parms
, void_list_node
);
1226 /* We mark the PARMS as a parmlist so that declarator processing can
1227 disambiguate certain constructs. */
1228 if (parms
!= NULL_TREE
)
1229 TREE_PARMLIST (parms
) = 1;
1234 /* Begin a class definition, as indicated by T. */
1237 begin_class_definition (t
)
1240 push_obstacks_nochange ();
1241 end_temporary_allocation ();
1243 if (t
== error_mark_node
1244 || ! IS_AGGR_TYPE (t
))
1246 t
= make_lang_type (RECORD_TYPE
);
1247 pushtag (make_anon_name (), t
, 0);
1250 /* In a definition of a member class template, we will get here with an
1251 implicit typename, a TYPENAME_TYPE with a type. */
1252 if (TREE_CODE (t
) == TYPENAME_TYPE
)
1255 /* If we generated a partial instantiation of this type, but now
1256 we're seeing a real definition, we're actually looking at a
1257 partial specialization. Consider:
1259 template <class T, class U>
1265 template <class T, class U>
1268 typename X<Y<T, U> >::A a;
1271 template <class T, class U>
1276 We have to undo the effects of the previous partial
1278 if (PARTIAL_INSTANTIATION_P (t
))
1282 /* Unfortunately, when we're not in pedantic mode, we
1283 attempt to actually fill in some of the fields of the
1284 partial instantiation, in order to support the implicit
1285 typename extension. Clear those fields now, in
1286 preparation for the definition here. The fields cleared
1287 here must match those set in instantiate_class_template.
1288 Look for a comment mentioning begin_class_definition
1290 TYPE_BINFO_BASETYPES (t
) = NULL_TREE
;
1291 TYPE_FIELDS (t
) = NULL_TREE
;
1292 TYPE_METHODS (t
) = NULL_TREE
;
1293 CLASSTYPE_TAGS (t
) = NULL_TREE
;
1294 TYPE_SIZE (t
) = NULL_TREE
;
1297 /* This isn't a partial instantiation any more. */
1298 PARTIAL_INSTANTIATION_P (t
) = 0;
1300 /* If this type was already complete, and we see another definition,
1302 else if (TYPE_SIZE (t
))
1303 duplicate_tag_error (t
);
1305 /* Update the location of the decl. */
1306 DECL_SOURCE_FILE (TYPE_NAME (t
)) = input_filename
;
1307 DECL_SOURCE_LINE (TYPE_NAME (t
)) = lineno
;
1309 if (TYPE_BEING_DEFINED (t
))
1311 t
= make_lang_type (TREE_CODE (t
));
1312 pushtag (TYPE_IDENTIFIER (t
), t
, 0);
1314 maybe_process_partial_specialization (t
);
1316 TYPE_BEING_DEFINED (t
) = 1;
1317 /* Reset the interface data, at the earliest possible
1318 moment, as it might have been set via a class foo;
1320 /* Don't change signatures. */
1321 if (! IS_SIGNATURE (t
))
1324 tree name
= TYPE_IDENTIFIER (t
);
1326 if (! ANON_AGGRNAME_P (name
))
1328 CLASSTYPE_INTERFACE_ONLY (t
) = interface_only
;
1329 SET_CLASSTYPE_INTERFACE_UNKNOWN_X
1330 (t
, interface_unknown
);
1333 /* Only leave this bit clear if we know this
1334 class is part of an interface-only specification. */
1335 if (! CLASSTYPE_INTERFACE_KNOWN (t
)
1336 || ! CLASSTYPE_INTERFACE_ONLY (t
))
1337 CLASSTYPE_VTABLE_NEEDS_WRITING (t
) = 1;
1340 tmp
= TYPE_IDENTIFIER ($
<ttype
>0);
1341 if (tmp
&& IDENTIFIER_TEMPLATE (tmp
))
1342 overload_template_name (tmp
, 1);
1344 reset_specialization();
1346 /* In case this is a local class within a template
1347 function, we save the current tree structure so
1348 that we can get it back later. */
1351 /* Make a declaration for this class in its own scope. */
1352 build_self_reference ();
1357 /* Finish the member declaration given by DECL. */
1360 finish_member_declaration (decl
)
1363 if (decl
== error_mark_node
|| decl
== NULL_TREE
)
1366 if (decl
== void_type_node
)
1367 /* The COMPONENT was a friend, not a member, and so there's
1368 nothing for us to do. */
1371 /* We should see only one DECL at a time. */
1372 my_friendly_assert (TREE_CHAIN (decl
) == NULL_TREE
, 0);
1374 /* Set up access control for DECL. */
1376 = (current_access_specifier
== access_private_node
);
1377 TREE_PROTECTED (decl
)
1378 = (current_access_specifier
== access_protected_node
);
1379 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
1381 TREE_PRIVATE (DECL_RESULT (decl
)) = TREE_PRIVATE (decl
);
1382 TREE_PROTECTED (DECL_RESULT (decl
)) = TREE_PROTECTED (decl
);
1385 /* Mark the DECL as a member of the current class. */
1386 if (TREE_CODE (decl
) == FUNCTION_DECL
1387 || DECL_FUNCTION_TEMPLATE_P (decl
))
1388 /* Historically, DECL_CONTEXT was not set for a FUNCTION_DECL in
1389 finish_struct. Presumably it is already set as the function is
1390 parsed. Perhaps DECL_CLASS_CONTEXT is already set, too? */
1391 DECL_CLASS_CONTEXT (decl
) = current_class_type
;
1393 DECL_CONTEXT (decl
) = current_class_type
;
1395 /* Put functions on the TYPE_METHODS list and everything else on the
1396 TYPE_FIELDS list. Note that these are built up in reverse order.
1397 We reverse them (to obtain declaration order) in finish_struct. */
1398 if (TREE_CODE (decl
) == FUNCTION_DECL
1399 || DECL_FUNCTION_TEMPLATE_P (decl
))
1401 /* We also need to add this function to the
1402 CLASSTYPE_METHOD_VEC. */
1403 add_method (current_class_type
, 0, decl
);
1405 TREE_CHAIN (decl
) = TYPE_METHODS (current_class_type
);
1406 TYPE_METHODS (current_class_type
) = decl
;
1410 /* All TYPE_DECLs go at the end of TYPE_FIELDS. Ordinary fields
1411 go at the beginning. The reason is that lookup_field_1
1412 searches the list in order, and we want a field name to
1413 override a type name so that the "struct stat hack" will
1414 work. In particular:
1416 struct S { enum E { }; int E } s;
1419 is legal. In addition, the FIELD_DECLs must be maintained in
1420 declaration order so that class layout works as expected.
1421 However, we don't need that order until class layout, so we
1422 save a little time by putting FIELD_DECLs on in reverse order
1423 here, and then reversing them in finish_struct_1. (We could
1424 also keep a pointer to the correct insertion points in the
1427 if (TREE_CODE (decl
) == TYPE_DECL
)
1428 TYPE_FIELDS (current_class_type
)
1429 = chainon (TYPE_FIELDS (current_class_type
), decl
);
1432 TREE_CHAIN (decl
) = TYPE_FIELDS (current_class_type
);
1433 TYPE_FIELDS (current_class_type
) = decl
;
1436 /* Enter the DECL into the scope of the class. */
1437 if (TREE_CODE (decl
) != USING_DECL
)
1438 pushdecl_class_level (decl
);
1442 /* Finish a class definition T with the indicate ATTRIBUTES. If SEMI,
1443 the definition is immediately followed by a semicolon. Returns the
1447 finish_class_definition (t
, attributes
, semi
, pop_scope_p
)
1453 /* finish_struct nukes this anyway; if finish_exception does too,
1456 note_got_semicolon (t
);
1458 /* If we got any attributes in class_head, xref_tag will stick them in
1459 TREE_TYPE of the type. Grab them now. */
1460 attributes
= chainon (TREE_TYPE (t
), attributes
);
1461 TREE_TYPE (t
) = NULL_TREE
;
1463 if (TREE_CODE (t
) == ENUMERAL_TYPE
)
1467 t
= finish_struct (t
, attributes
, semi
);
1469 note_got_semicolon (t
);
1475 check_for_missing_semicolon (t
);
1477 pop_scope (CP_DECL_CONTEXT (TYPE_MAIN_DECL (t
)));
1478 if (current_scope () == current_function_decl
)
1479 do_pending_defargs ();
1484 /* Finish processing the default argument expressions cached during
1485 the processing of a class definition. */
1488 begin_inline_definitions ()
1491 && current_scope () == current_function_decl
)
1492 do_pending_inlines ();
1495 /* Finish processing the inline function definitions cached during the
1496 processing of a class definition. */
1499 finish_inline_definitions ()
1501 if (current_class_type
== NULL_TREE
)
1502 clear_inline_text_obstack ();
1504 /* Undo the begin_tree in begin_class_definition. */
1508 /* Finish processing the declaration of a member class template
1509 TYPES whose template parameters are given by PARMS. */
1512 finish_member_class_template (types
)
1517 /* If there are declared, but undefined, partial specializations
1518 mixed in with the typespecs they will not yet have passed through
1519 maybe_process_partial_specialization, so we do that here. */
1520 for (t
= types
; t
!= NULL_TREE
; t
= TREE_CHAIN (t
))
1521 if (IS_AGGR_TYPE_CODE (TREE_CODE (TREE_VALUE (t
))))
1522 maybe_process_partial_specialization (TREE_VALUE (t
));
1524 note_list_got_semicolon (types
);
1525 grok_x_components (types
);
1526 if (TYPE_CONTEXT (TREE_VALUE (types
)) != current_class_type
)
1527 /* The component was in fact a friend declaration. We avoid
1528 finish_member_template_decl performing certain checks by
1532 finish_member_template_decl (types
);
1534 /* As with other component type declarations, we do
1535 not store the new DECL on the list of
1540 /* Finish processsing a complete template declaration. The PARMS are
1541 the template parameters. */
1544 finish_template_decl (parms
)
1548 end_template_decl ();
1550 end_specialization ();
1553 /* Finish processing a a template-id (which names a type) of the form
1554 NAME < ARGS >. Return the TYPE_DECL for the type named by the
1555 template-id. If ENTERING_SCOPE is non-zero we are about to enter
1556 the scope of template-id indicated. */
1559 finish_template_type (name
, args
, entering_scope
)
1566 decl
= lookup_template_class (name
, args
,
1567 NULL_TREE
, NULL_TREE
, entering_scope
);
1568 if (decl
!= error_mark_node
)
1569 decl
= TYPE_STUB_DECL (decl
);
1574 /* SR is a SCOPE_REF node. Enter the scope of SR, whether it is a
1575 namespace scope or a class scope. */
1581 tree scope
= TREE_OPERAND (sr
, 0);
1583 if (TREE_CODE (scope
) == NAMESPACE_DECL
)
1585 push_decl_namespace (scope
);
1586 TREE_COMPLEXITY (sr
) = -1;
1588 else if (scope
!= current_class_type
)
1590 if (TREE_CODE (scope
) == TYPENAME_TYPE
)
1592 /* In a declarator for a template class member, the scope will
1593 get here as an implicit typename, a TYPENAME_TYPE with a type. */
1594 scope
= TREE_TYPE (scope
);
1595 TREE_OPERAND (sr
, 0) = scope
;
1597 push_nested_class (scope
, 3);
1598 TREE_COMPLEXITY (sr
) = current_class_depth
;
1602 /* Finish processing a BASE_CLASS with the indicated ACCESS_SPECIFIER.
1603 Return a TREE_LIST containing the ACCESS_SPECIFIER and the
1604 BASE_CLASS, or NULL_TREE if an error occurred. The
1605 ACCESSS_SPECIFIER is one of
1606 access_{default,public,protected_private}[_virtual]_node.*/
1609 finish_base_specifier (access_specifier
, base_class
,
1610 current_aggr_is_signature
)
1611 tree access_specifier
;
1613 int current_aggr_is_signature
;
1618 if (base_class
== NULL_TREE
)
1620 error ("invalid base class");
1621 type
= error_mark_node
;
1624 type
= TREE_TYPE (base_class
);
1625 if (current_aggr_is_signature
&& access_specifier
)
1626 error ("access and source specifiers not allowed in signature");
1627 if (! is_aggr_type (type
, 1))
1629 else if (current_aggr_is_signature
1630 && (! type
) && (! IS_SIGNATURE (type
)))
1632 error ("class name not allowed as base signature");
1635 else if (current_aggr_is_signature
)
1637 sorry ("signature inheritance, base type `%s' ignored",
1638 IDENTIFIER_POINTER (access_specifier
));
1639 result
= build_tree_list (access_public_node
, type
);
1641 else if (type
&& IS_SIGNATURE (type
))
1643 error ("signature name not allowed as base class");
1647 result
= build_tree_list (access_specifier
, type
);
1652 /* Called when multiple declarators are processed. If that is not
1653 premitted in this context, an error is issued. */
1656 check_multiple_declarators ()
1660 In a template-declaration, explicit specialization, or explicit
1661 instantiation the init-declarator-list in the declaration shall
1662 contain at most one declarator.
1664 We don't just use PROCESSING_TEMPLATE_DECL for the first
1665 condition since that would disallow the perfectly legal code,
1666 like `template <class T> struct S { int i, j; };'. */
1667 tree scope
= current_scope ();
1669 if (scope
&& TREE_CODE (scope
) == FUNCTION_DECL
)
1670 /* It's OK to write `template <class T> void f() { int i, j;}'. */
1673 if (PROCESSING_REAL_TEMPLATE_DECL_P ()
1674 || processing_explicit_instantiation
1675 || processing_specialization
)
1676 cp_error ("multiple declarators in template declaration");
1680 finish_typeof (expr
)
1683 if (processing_template_decl
)
1687 push_obstacks_nochange ();
1688 end_temporary_allocation ();
1690 t
= make_lang_type (TYPEOF_TYPE
);
1691 TYPE_FIELDS (t
) = expr
;
1698 return TREE_TYPE (expr
);