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Symbol tables are insert only.

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* cp-tree.h (default_hash_traits <lang_identifier *>): Don't
	derive from pointer_hash.  Make undeletable.

From-SVN: r249266
This commit is contained in:
Nathan Sidwell 2017-06-16 14:54:39 +00:00 committed by Nathan Sidwell
parent ba27a39d37
commit d7b11178c4
2 changed files with 10 additions and 2 deletions
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4
gcc/cp/ChangeLog
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@ -1,5 +1,9 @@
2017-06-16 Nathan Sidwell <nathan@acm.org>
Symbol tables are insert only.
* cp-tree.h (default_hash_traits <lang_identifier *>): Don't
derive from pointer_hash. Make undeletable.
* class.c (resort_type_method_vec): Avoid potential unsigned
overflow.

8
gcc/cp/cp-tree.h
View File

@ -550,7 +550,7 @@ identifier_p (tree t)
template <>
struct default_hash_traits <lang_identifier *>
: pointer_hash <tree_node>, ggc_remove <tree>
: pointer_hash <tree_node>
{
/* Use a regular tree as the type, to make using the hash table
simpler. We'll get dynamic type checking with the hash function
@ -558,10 +558,14 @@ struct default_hash_traits <lang_identifier *>
GTY((skip)) typedef tree value_type;
GTY((skip)) typedef tree compare_type;
static hashval_t hash (const value_type &id)
static hashval_t hash (const value_type id)
{
return IDENTIFIER_HASH_VALUE (id);
}
/* Nothing is deletable. Everything is insertable. */
static bool is_deleted (value_type) { return false; }
static void remove (value_type) { gcc_unreachable (); }
};
/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a