[PATCH, MPX, 2/X] Pointers Checker. Add flag to varpool_node

[Ilya Enkovich]

Hi,

Here is a patch to add flag for marking symbols as requiring static 
initialization of bounds.  Used by Pointer Bounds Checker to handle statically 
initialized pointers and static bounds vars.

Thanks,
Ilya
--
2013-11-19  Ilya Enkovich  <ilya.enkov...@intel.com>

        * cgraph.h (varpool_node): Add need_bounds_init field.
        * lto-cgraph.c (lto_output_varpool_node): Output
        need_bounds_init value.
        (input_varpool_node): Read need_bounds_init value.
        * varpool.c (dump_varpool_node): Dump need_bounds_init field.


diff --git a/gcc/cgraph.h b/gcc/cgraph.h
index 1ac6dfb..31c3635 100644
--- a/gcc/cgraph.h
+++ b/gcc/cgraph.h
@@ -520,6 +520,10 @@ class GTY((tag ("SYMTAB_VARIABLE"))) varpool_node : public 
symtab_node {
 public:
   /* Set when variable is scheduled to be assembled.  */
   unsigned output : 1;
+
+  /* Set when variable has statically initialized pointer
+     or is a static bounds variable and needs initalization.  */
+  unsigned need_bounds_init : 1;
 };
 
 /* Every top level asm statement is put into a asm_node.  */
diff --git a/gcc/lto-cgraph.c b/gcc/lto-cgraph.c
index 99dbf96..0d3479d 100644
--- a/gcc/lto-cgraph.c
+++ b/gcc/lto-cgraph.c
@@ -579,6 +579,7 @@ lto_output_varpool_node (struct lto_simple_output_block 
*ob, struct varpool_node
                     && boundary_p && !DECL_EXTERNAL (node->decl), 1);
          /* in_other_partition.  */
     }
+  bp_pack_value (&bp, node->need_bounds_init, 1);
   streamer_write_bitpack (&bp);
   if (node->same_comdat_group && !boundary_p)
     {
@@ -1149,6 +1150,7 @@ input_varpool_node (struct lto_file_decl_data *file_data,
   node->analyzed = bp_unpack_value (&bp, 1);
   node->used_from_other_partition = bp_unpack_value (&bp, 1);
   node->in_other_partition = bp_unpack_value (&bp, 1);
+  node->need_bounds_init = bp_unpack_value (&bp, 1);
   if (node->in_other_partition)
     {
       DECL_EXTERNAL (node->decl) = 1;
diff --git a/gcc/varpool.c b/gcc/varpool.c
index 1e4c823..471db82 100644
--- a/gcc/varpool.c
+++ b/gcc/varpool.c
@@ -204,6 +204,8 @@ dump_varpool_node (FILE *f, struct varpool_node *node)
     fprintf (f, " initialized");
   if (node->output)
     fprintf (f, " output");
+  if (node->need_bounds_init)
+    fprintf (f, " need-bounds-init");
   if (TREE_READONLY (node->decl))
     fprintf (f, " read-only");
   if (ctor_for_folding (node->decl) != error_mark_node)