suzanne.soy/racket
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix collision handling for eq?-based immutable hash with #ts

Browse Source 
When creating a collision node, make sure the "has a value" bit
is set, since the "has a hash code" bit should imply it.

This bug was made easier to trigger by 3fbb384604, but it was
potentially a problem for scope sets before.

Closes #1366

Merge to v6.6
This commit is contained in:
Matthew Flatt 2016-07-08 07:25:30 -06:00
parent fd85bcaf21
commit 42be8aadff
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
racket/src/racket/src/hash.c
View File

@ -2414,7 +2414,7 @@ intptr_t scheme_eqv_hash_key2(Scheme_Object *o)
/* In a hash tree without HASHTR_HAS_VAL, all values are `#t`; we nodes without
HASHTR_HAS_VAL to nodes with it on demand, but we don't go the other way */
#define NOT_IMPLICIT_VALUE(v) (!SAME_OBJ(v, scheme_true))
#define NOT_IMPLICIT_VALUE(v) ((v) && !SAME_OBJ(v, scheme_true))
#define HASHTR_SUBTREEP(o) SAME_TYPE(SCHEME_TYPE(o), scheme_hash_tree_subtree_type)
#define HASHTR_COLLISIONP(o) SAME_TYPE(SCHEME_TYPE(o), scheme_hash_tree_collision_type)
@ -3340,7 +3340,7 @@ Scheme_Hash_Tree *scheme_hash_tree_set_w_key_wraps(Scheme_Hash_Tree *tree, Schem
return tree;
else {
/* new hash collision */
in_tree = hamt_make2(SCHEME_HASHTR_KIND(in_tree) | HASHTR_HAS_CODE, 0,
in_tree = hamt_make2(SCHEME_HASHTR_KIND(in_tree) | HASHTR_HAS_VAL | HASHTR_HAS_CODE, 0,
0, in_tree->els[pos], mzHAMT_VAL(in_tree, pos),
1, key, val);
in_tree->iso.so.type = scheme_hash_tree_collision_type;