re PR c/4784 (Anonymous structs issues)
PR c/4784 * c-decl.c (detect_field_duplicates_hash): New. Handle anonymous structures and unions recursively. (detect_field_duplicates): Move duplicate detection with a hash to detect_field_duplicates_hash. Always use a hash if anonymous structures or unions are present. * doc/extend.texi (Unnamed Fields): Document that duplicate fields give errors. testsuite: * gcc.dg/anon-struct-9.c: New test. From-SVN: r159204
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2010-05-09 Joseph Myers <joseph@codesourcery.com>
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PR c/4784
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* c-decl.c (detect_field_duplicates_hash): New. Handle anonymous
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structures and unions recursively.
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(detect_field_duplicates): Move duplicate detection with a hash to
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detect_field_duplicates_hash. Always use a hash if anonymous
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structures or unions are present.
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* doc/extend.texi (Unnamed Fields): Document that duplicate fields
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give errors.
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2010-05-09 H.J. Lu <hongjiu.lu@intel.com>
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PR target/44046
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48
gcc/c-decl.c
48
gcc/c-decl.c
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@ -6629,6 +6629,31 @@ grokfield (location_t loc,
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return value;
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}
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/* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
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to HTAB, giving errors for any duplicates. */
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static void
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detect_field_duplicates_hash (tree fieldlist, htab_t htab)
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{
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tree x, y;
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void **slot;
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for (x = fieldlist; x ; x = TREE_CHAIN (x))
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if ((y = DECL_NAME (x)) != 0)
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{
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slot = htab_find_slot (htab, y, INSERT);
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if (*slot)
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{
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error ("duplicate member %q+D", x);
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DECL_NAME (x) = NULL_TREE;
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}
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*slot = y;
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}
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else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
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|| TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
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detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
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}
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/* Generate an error for any duplicate field names in FIELDLIST. Munge
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the list such that this does not present a problem later. */
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@ -6647,11 +6672,16 @@ detect_field_duplicates (tree fieldlist)
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return;
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do {
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timeout--;
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if (DECL_NAME (x) == NULL_TREE
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&& (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
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|| TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
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timeout = 0;
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x = TREE_CHAIN (x);
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} while (timeout > 0 && x);
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/* If there were "few" fields, avoid the overhead of allocating
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a hash table. Instead just do the nested traversal thing. */
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/* If there were "few" fields and no anonymous structures or unions,
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avoid the overhead of allocating a hash table. Instead just do
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the nested traversal thing. */
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if (timeout > 0)
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{
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for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
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@ -6668,20 +6698,8 @@ detect_field_duplicates (tree fieldlist)
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else
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{
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htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
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void **slot;
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for (x = fieldlist; x ; x = TREE_CHAIN (x))
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if ((y = DECL_NAME (x)) != 0)
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{
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slot = htab_find_slot (htab, y, INSERT);
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if (*slot)
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{
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error ("duplicate member %q+D", x);
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DECL_NAME (x) = NULL_TREE;
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}
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*slot = y;
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}
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detect_field_duplicates_hash (fieldlist, htab);
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htab_delete (htab);
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}
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}
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@ -12760,8 +12760,7 @@ struct @{
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@end smallexample
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It is ambiguous which @code{a} is being referred to with @samp{foo.a}.
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Such constructs are not supported and must be avoided. In the future,
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such constructs may be detected and treated as compilation errors.
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The compiler gives errors for such constructs.
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@opindex fms-extensions
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Unless @option{-fms-extensions} is used, the unnamed field must be a
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@ -1,3 +1,8 @@
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2010-05-09 Joseph Myers <joseph@codesourcery.com>
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PR c/4784
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* gcc.dg/anon-struct-9.c: New test.
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2010-05-09 Richard Guenther <rguenther@suse.de>
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PR middle-end/44043
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@ -0,0 +1,129 @@
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/* Test for diagnostics for duplicate member names in anonymous
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structures and unions. PR 4784. */
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/* { dg-do compile } */
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/* { dg-options "" } */
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struct s1
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{
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int x;
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struct
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{
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int x; /* { dg-error "duplicate member" } */
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};
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};
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struct s2
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{
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struct
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{
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int a;
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struct
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{
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int b;
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};
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};
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struct
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{
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int b; /* { dg-error "duplicate member" } */
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};
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};
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struct s3
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{
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struct
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{
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int a;
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struct
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{
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int b;
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};
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};
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struct
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{
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int b; /* { dg-error "duplicate member" } */
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int c;
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};
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};
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struct s4
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{
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int x;
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struct
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{
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int x;
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} y;
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};
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union u1
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{
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int x;
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union
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{
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int x; /* { dg-error "duplicate member" } */
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};
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};
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union u2
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{
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union
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{
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int a;
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union
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{
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int b;
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};
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};
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union
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{
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int b; /* { dg-error "duplicate member" } */
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};
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};
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union u3
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{
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union
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{
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int a;
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union
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{
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int b;
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};
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};
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union
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{
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int b; /* { dg-error "duplicate member" } */
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int c;
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};
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};
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union u4
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{
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int x;
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union
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{
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int x;
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} y;
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};
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#define D10(x) int x##0; int x##1; int x##2; int x##3; int x##4; int x##5; int x##6; int x##7; int x##8; int x##9;
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#define D100(x) D10(x##0) D10(x##1) D10(x##2) D10(x##3) D10(x##4) D10(x##5) D10(x##6) D10(x##7) D10(x##8) D10(x##9)
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#define S10(x) struct { D100(x##0) }; struct { D100(x##1) }; struct { D100(x##2) }; struct { D100(x##3) }; struct { D100(x##4) }; struct { D100(x##5) }; struct { D100(x##6) }; struct { D100(x##7) }; struct { D100(x##8) }; struct { D100(x##9) };
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struct sbig
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{
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S10(a)
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S10(b)
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S10(c)
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S10(d)
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S10(e)
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S10(f)
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S10(g)
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S10(h)
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S10(i)
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S10(j)
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struct
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{
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int a123; /* { dg-error "duplicate member" } */
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};
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};
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