Move verify into a module. Make characterizer a module. Move exe searching to modules.

compiler/characterizer/__init__.py

@@ -0,0 +1,31 @@
+import os
+import debug
+from globals import OPTS,find_exe,get_tool
+import lib
+import delay
+import setup_hold
+
+
+debug.info(2,"Initializing characterizer...")
+
+spice_exe = ""
+
+if OPTS.analytical_delay:
+    debug.info(1,"Using analytical delay models (no characterization)")
+else:
+    if OPTS.spice_version != "":
+        spice_exe=find_exe(OPTS.spice_version)
+        if spice_exe=="":
+            debug.error("{0} not found. Unable to perform characterization.".format(OPTS.spice_version),1)
+    else:
+        (choice,spice_exe) = get_tool("spice",["xa", "hspice", "ngspice", "ngspice.exe"])
+        OPTS.spice_version = choice
+
+    # set the input dir for spice files if using ngspice 
+    if OPTS.spice_version == "ngspice":
+        os.environ["NGSPICE_INPUT_DIR"] = "{0}".format(OPTS.openram_temp)
+    
+    if spice_exe == "":
+        debug.error("No recognizable spice version found. Unable to perform characterization.",1)
+
+