Add atom_pb_bimap locking

This lock ensures that the atom_pb_bimap structure in global context
is not accessed in packing.

Author: AmirhosseinPoolad

vpr/src/base/atom_lookup.h

@@ -27,15 +27,15 @@ class AtomLookup {
 
     typedef vtr::Range<pin_tnode_iterator> pin_tnode_range;
 
-    bool lock_atom_pb = false;
+    bool lock_atom_pb_bimap = false;
 
   public:
     /*
      * PBs
      */
 
-    inline AtomPBBimap &mutable_atom_pb_bimap() {return atom_to_pb_bimap_;}
-    inline const AtomPBBimap &atom_pb_bimap() const {return atom_to_pb_bimap_;}
+    inline AtomPBBimap &mutable_atom_pb_bimap() {VTR_ASSERT(!lock_atom_pb_bimap); return atom_to_pb_bimap_;}
+    inline const AtomPBBimap &atom_pb_bimap() const {VTR_ASSERT(!lock_atom_pb_bimap); return atom_to_pb_bimap_;}
 
     /*
      * PB Pins

vpr/src/pack/pack.cpp

@@ -176,7 +176,7 @@ bool try_pack(t_packer_opts* packer_opts,
                               is_global,
                               flat_placement_info);
 
-    g_vpr_ctx.mutable_atom().mutable_lookup().lock_atom_pb = true;
+    g_vpr_ctx.mutable_atom().mutable_lookup().lock_atom_pb_bimap = true;
 
     while (true) {
         //Cluster the netlist
@@ -320,7 +320,7 @@ bool try_pack(t_packer_opts* packer_opts,
      * }
      */
     /******************** End **************************/
-    g_vpr_ctx.mutable_atom().mutable_lookup().lock_atom_pb = false;
+    g_vpr_ctx.mutable_atom().mutable_lookup().lock_atom_pb_bimap = false;
     g_vpr_ctx.mutable_atom().mutable_lookup().set_atom_to_pb_bimap(cluster_legalizer.atom_pb_lookup());
     //check clustering and output it
     check_and_output_clustering(cluster_legalizer, *packer_opts, is_clock, &arch);