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Symbol tables are insert only. 

* 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> 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 * class.c (resort_type_method_vec): Avoid potential unsigned
overflow. overflow.

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

@ -550,7 +550,7 @@ identifier_p (tree t)
template <> template <>
struct default_hash_traits <lang_identifier *> 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 /* Use a regular tree as the type, to make using the hash table
simpler. We'll get dynamic type checking with the hash function 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 value_type;
GTY((skip)) typedef tree compare_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); 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 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a