[PATCH 6/9] Fix memory leak in ipa-pure-const

[marxin]

Leak can be seen e.g. here:
gcc i386/mvc6.c -fno-diagnostics-show-caret -fdiagnostics-color=never -O3

gcc/ChangeLog:

2016-05-18  Martin Liska  <mli...@suse.cz>

        * ipa-pure-const.c (set_function_state): Remove an existing
        funct_state.
        (remove_node_data): Do not free it as it's released
        in set_function_state.
---
 gcc/ipa-pure-const.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/gcc/ipa-pure-const.c b/gcc/ipa-pure-const.c
index ba76275..a9570e4 100644
--- a/gcc/ipa-pure-const.c
+++ b/gcc/ipa-pure-const.c
@@ -258,6 +258,13 @@ set_function_state (struct cgraph_node *node, funct_state 
s)
   if (!funct_state_vec.exists ()
       || funct_state_vec.length () <= (unsigned int)node->uid)
      funct_state_vec.safe_grow_cleared (node->uid + 1);
+
+  /* If funct_state_vec already contains a funct_state, we have to release
+     it before it's going to be ovewritten.  */
+  if (funct_state_vec[node->uid] != NULL
+      && funct_state_vec[node->uid] != &varying_state)
+    free (funct_state_vec[node->uid]);
+
   funct_state_vec[node->uid] = s;
 }
 
@@ -956,12 +963,7 @@ static void
 remove_node_data (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
 {
   if (has_function_state (node))
-    {
-      funct_state l = get_function_state (node);
-      if (l != &varying_state)
-        free (l);
-      set_function_state (node, NULL);
-    }
+    set_function_state (node, NULL);
 }
 
 
-- 
2.8.2