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| author | tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4> | 2019-02-12 13:02:48 +0000 |
|---|---|---|
| committer | Tom Tromey <tromey@adacore.com> | 2019-02-12 06:06:19 -0700 |
| commit | e20773049fde7b9a123fda4485259fc06249b22f (patch) | |
| tree | c5c01da0056ac3e64cabcdd96b44744e791c4278 /include/splay-tree.h | |
| parent | 04d7fa2132c05b962d85e2047646e15b8a490f4e (diff) | |
| download | gdb-e20773049fde7b9a123fda4485259fc06249b22f.zip gdb-e20773049fde7b9a123fda4485259fc06249b22f.tar.gz gdb-e20773049fde7b9a123fda4485259fc06249b22f.tar.bz2 | |
Fix splay tree KEY leak detected in GDB test gdb.base/macscp.exp
When a node is removed from a splay tree, the splay tree was
not using the function splay_tree_delete_key_fn to release the key.
This was causing a leak, fixed by Tom Tromey.
This patch fixes another key leak, that happens when a key equal to
a key already present is inserted. In such a case, we have to release
the old KEY.
Note that this is based on the assumption that the caller always
allocates a new KEY when doing an insert.
Also, clarify the documentation about when the release functions are
called.
2019-02-11 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* splay-tree.h (splay_tree_delete_key_fn): Update comment.
(splay_tree_delete_value_fn): Likewise.
libiberty/ChangeLog
2019-02-11 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* splay-tree.c (splay_tree_insert): Also release old KEY in case
of insertion of a key equal to an already present key.
(splay_tree_new_typed_alloc): Update comment.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@268793 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'include/splay-tree.h')
| -rw-r--r-- | include/splay-tree.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/include/splay-tree.h b/include/splay-tree.h index 0d26272..da533de 100644 --- a/include/splay-tree.h +++ b/include/splay-tree.h @@ -58,11 +58,18 @@ typedef struct splay_tree_node_s *splay_tree_node; typedef int (*splay_tree_compare_fn) (splay_tree_key, splay_tree_key); /* The type of a function used to deallocate any resources associated - with the key. */ + with the key. If you provide this function, the splay tree + will take the ownership of the memory of the splay_tree_key arg + of splay_tree_insert. This function is called to release the keys + present in the tree when calling splay_tree_delete or splay_tree_remove. + If splay_tree_insert is called with a key equal to a key already + present in the tree, the old key and old value will be released. */ typedef void (*splay_tree_delete_key_fn) (splay_tree_key); /* The type of a function used to deallocate any resources associated - with the value. */ + with the value. If you provide this function, the memory of the + splay_tree_value arg of splay_tree_insert is managed similarly to + the splay_tree_key memory: see splay_tree_delete_key_fn. */ typedef void (*splay_tree_delete_value_fn) (splay_tree_value); /* The type of a function used to iterate over the tree. */ |