Store an SHA256 digest of the architecture file

Author: kmurray

libarchfpga/src/physical_types.h

@@ -1030,6 +1030,8 @@ typedef struct s_switchblock_inf{
 /*   Detailed routing architecture */
 typedef struct s_arch t_arch;
 struct s_arch {
+    char* architecture_id; //Secure hash digest of the architecture file to uniquely identify this architecture
+
 	t_chan_width_dist Chans;
 	enum e_switch_block_type SBType;
 	std::vector<t_switchblock_inf> switchblocks;

libarchfpga/src/read_xml_arch_file.cpp

@@ -50,6 +50,7 @@
 #include "vtr_log.h"
 #include "vtr_util.h"
 #include "vtr_matrix.h"
+#include "vtr_digest.h"
 
 #include "arch_types.h"
 #include "arch_util.h"
@@ -173,6 +174,9 @@ void XmlReadArch(const char *ArchFile, const bool timing_enabled,
 				ArchFile);
 	}
 
+    //Create a unique identifier for this architecture file based on it's contents
+    arch->architecture_id = vtr::strdup(vtr::secure_digest_file(ArchFile).c_str());
+
 	/* Parse the file */
 	pugi::xml_document doc;
 	pugiutil::loc_data loc_data;