[PATCH, CHKP, PR target/65183] Avoid wrong pass local data usage

[Ilya Enkovich]

Hi,

This patch fixes a case when outdated checker local data is used to process 
external calls.  Bootstrapped and tested on x86_64-unknown-linux-gnu.  OK for 
trunk?

Thanks,
Ilya
--
gcc/

2015-02-25  Ilya Enkovich  <ilya.enkov...@intel.com>

        PR target/65183
        * tree-chkp.c (chkp_check_lower): Don't check against
        zero bounds for already instrumented functions.
        (chkp_check_upper): Likewise.
        (chkp_fini): Clean pass local data to avoid wrong reusage.

gcc/testsuite/

2015-02-25  Ilya Enkovich  <ilya.enkov...@intel.com>

        PR target/65183
        * gcc.target/i386/pr65183.c: New.


diff --git a/gcc/testsuite/gcc.target/i386/pr65183.c 
b/gcc/testsuite/gcc.target/i386/pr65183.c
new file mode 100644
index 0000000..069a543
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr65183.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target mpx } */
+/* { dg-options "-O -fcheck-pointer-bounds -fchkp-use-nochk-string-functions 
-mmpx" } */
+
+extern void bar(void *);
+extern void baz(void);
+
+static int lc[32];
+
+void foobar(void *c)
+{
+  bar(&c);
+  __builtin_memcpy (lc, c, lc[0]);
+}
+
+void foo ()
+{
+  baz ();
+  foobar(0);
+}
diff --git a/gcc/tree-chkp.c b/gcc/tree-chkp.c
index b0a3a15..d2df4ba 100644
--- a/gcc/tree-chkp.c
+++ b/gcc/tree-chkp.c
@@ -1268,7 +1268,8 @@ chkp_check_lower (tree addr, tree bounds,
   gimple check;
   tree node;
 
-  if (bounds == chkp_get_zero_bounds ())
+  if (!chkp_function_instrumented_p (current_function_decl)
+      && bounds == chkp_get_zero_bounds ())
     return;
 
   if (dirflag == integer_zero_node
@@ -1314,7 +1315,8 @@ chkp_check_upper (tree addr, tree bounds,
   gimple check;
   tree node;
 
-  if (bounds == chkp_get_zero_bounds ())
+  if (!chkp_function_instrumented_p (current_function_decl)
+      && bounds == chkp_get_zero_bounds ())
     return;
 
   if (dirflag == integer_zero_node
@@ -4306,6 +4308,10 @@ chkp_fini (void)
   free_dominance_info (CDI_POST_DOMINATORS);
 
   bitmap_obstack_release (NULL);
+
+  entry_block = NULL;
+  zero_bounds = NULL_TREE;
+  none_bounds = NULL_TREE;
 }
 
 /* Main instrumentation pass function.  */