asdl_cpp: port changes from LFortran

grammar/asdl_cpp.py

@@ -1881,6 +1881,11 @@ def visitConstructor(self, cons, _):
         self.emit(    'Location loc;', 2)
         self.emit(    'loc.first = self().read_int64();', 2)
         self.emit(    'loc.last = self().read_int64();', 2)
+        if subs["lcompiler"] == "lfortran":
+            # Set the location to 0 for now, since we do not yet
+            # support multiple files
+            self.emit(    'loc.first = 0;', 2)
+            self.emit(    'loc.last = 0;', 2)
         for line in lines:
             self.emit(line, 2)
         self.emit(    'return %s::make_%s_t(%s);' % (subs["MOD"], name, ", ".join(args)), 2)
@@ -2143,11 +2148,6 @@ def add_masks(fields, node):
 def main(argv):
     if len(argv) == 3:
         def_file, out_file = argv[1:]
-    elif len(argv) == 1:
-        print("Assuming default values of AST.asdl and ast.h")
-        here = os.path.dirname(__file__)
-        def_file = os.path.join(here, "AST.asdl")
-        out_file = os.path.join(here, "..", "src", "lpython", "ast.h")
     else:
         print("invalid arguments")
         return 2
@@ -2165,6 +2165,9 @@ def main(argv):
     if subs["MOD"] == "LPYTHON":
         subs["MOD"] = "LPython::AST"
         subs["mod"] = "ast"
+        subs["lcompiler"] = "lpython"
+    else:
+        subs["lcompiler"] = "lfortran"
     is_asr = (mod.name.upper() == "ASR")
     fp = open(out_file, "w", encoding="utf-8")
     try: