[lib][rr_graph] check schema id if capnp is enabled

Author: amin1377

libs/librrgraph/src/io/rr_graph_reader.cpp

@@ -13,8 +13,6 @@
  * are overwritten by the rr graph file if one is specified. If an optional
  * identifier such as capacitance is not specified, it is set to 0 */
 
-
-#include <capnp/schema.h>
 #include "rr_graph_reader.h"
 
 #include "rr_graph_uxsdcxx_serializer.h"
@@ -28,6 +26,7 @@
 #include "pugixml_util.hpp"
 
 #ifdef VTR_ENABLE_CAPNPROTO
+#    include <capnp/schema.h>
 #    include "rr_graph_uxsdcxx_capnp.h"
 #    include "mmap_file.h"
 #endif
@@ -87,9 +86,12 @@ void load_rr_file(RRGraphBuilder* rr_graph_builder,
         rr_graph_builder->set_tileable(true);
     }
 
+    unsigned long schema_file_id = 0;
+#ifdef VTR_ENABLE_CAPNPROTO
     ::capnp::Schema schema = ::capnp::Schema::from<ucap::RrGraph>();
-    unsigned long schema_file_id = schema.getProto().getScopeId();
+    schema_file_id = schema.getProto().getScopeId();
     VTR_LOG("Schema file ID: 0x%016lx\n", schema_file_id);
+#endif
 
     RrGraphSerializer reader(
         graph_type,

libs/librrgraph/src/io/rr_graph_uxsdcxx_serializer.h

@@ -1730,10 +1730,14 @@ class RrGraphSerializer final : public uxsd::RrGraphBase<RrGraphContextTypes> {
      *   </xs:complexType>
      */
     inline void set_rr_graph_schema_file_id(unsigned long schema_file_id, void*& /*ctx*/) final {
-        if (schema_file_id != schema_file_id_) {
-            report_error(
-                "Schema file ID mismatch: Expected ID 0x%016lx, but got ID 0x%016lx",
-                schema_file_id_, schema_file_id);
+        // Only check if the schema file ID is not 0. If it is 0, it means capnproto is not enabled.
+        // Thus, we cannot check the schema file ID mismatch.
+        if (schema_file_id_ != 0) {
+            if (schema_file_id != schema_file_id_) {
+                report_error(
+                    "Schema file ID mismatch: Expected ID 0x%016lx, but got ID 0x%016lx",
+                    schema_file_id_, schema_file_id);
+            }
         }
     }
     inline void set_rr_graph_tool_comment(const char* tool_comment, void*& /*ctx*/) final {

libs/librrgraph/src/io/rr_graph_writer.cpp

@@ -5,16 +5,15 @@
  * children tags such as timing, location, or some general
  * details. Each tag has attributes to describe them */
 
-
-#include <capnp/schema.h>
- #include "rr_graph_writer.h"
+#include "rr_graph_writer.h"
 
 #include <cstdio>
 #include <fstream>
 #include <limits>
 #include "rr_graph_uxsdcxx_serializer.h"
 #include "rr_graph_uxsdcxx.h"
 #ifdef VTR_ENABLE_CAPNPROTO
+#    include <capnp/schema.h>
 #    include "serdes_utils.h"
 #    include "rr_graph_uxsdcxx_capnp.h"
 #endif
@@ -41,9 +40,12 @@ void write_rr_graph(RRGraphBuilder* rr_graph_builder,
                     const char* echo_file_name,
                     bool is_flat) {
 
+    unsigned long schema_file_id = 0;
+#ifdef VTR_ENABLE_CAPNPROTO
     ::capnp::Schema schema = ::capnp::Schema::from<ucap::RrGraph>();
-    unsigned long schema_file_id = schema.getProto().getScopeId();
+    schema_file_id = schema.getProto().getScopeId();
     VTR_LOG("Schema file ID: 0x%016lx\n", schema_file_id);
+#endif
 
     RrGraphSerializer reader(
         /*graph_type=*/e_graph_type(),