scripts: use build_ prefix for string not piped through cgen()

The gen_ prefix is awkward.  Generated C should go through cgen()
exactly once (see commit 1f9a7a1).  The common way to get this wrong is
passing a foo=gen_foo() keyword argument to mcgen().  I'd like us to
adopt a naming convention where gen_ means "something that's been piped
through cgen(), and thus must not be passed to cgen() or mcgen()".
Requires renaming gen_params(), gen_marshal_proto() and
gen_event_send_proto().

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170601124143.10915-1-marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

scripts/qapi-commands.py

@@ -21,7 +21,7 @@ def gen_command_decl(name, arg_type, boxed, ret_type):
 ''',
                  c_type=(ret_type and ret_type.c_type()) or 'void',
                  c_name=c_name(name),
-                 params=gen_params(arg_type, boxed, 'Error **errp'))
+                 params=build_params(arg_type, boxed, 'Error **errp'))
 
 
 def gen_call(name, arg_type, boxed, ret_type):
@@ -82,7 +82,7 @@ static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in, QObject **ret_out,
                  c_type=ret_type.c_type(), c_name=ret_type.c_name())
 
 
-def gen_marshal_proto(name):
+def build_marshal_proto(name):
     return ('void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)'
             % c_name(name))
 
@@ -91,7 +91,7 @@ def gen_marshal_decl(name):
     return mcgen('''
 %(proto)s;
 ''',
-                 proto=gen_marshal_proto(name))
+                 proto=build_marshal_proto(name))
 
 
 def gen_marshal(name, arg_type, boxed, ret_type):
@@ -103,7 +103,7 @@ def gen_marshal(name, arg_type, boxed, ret_type):
 {
     Error *err = NULL;
 ''',
-                proto=gen_marshal_proto(name))
+                proto=build_marshal_proto(name))
 
     if ret_type:
         ret += mcgen('''

scripts/qapi-event.py

@@ -14,10 +14,10 @@
 from qapi import *
 
 
-def gen_event_send_proto(name, arg_type, boxed):
+def build_event_send_proto(name, arg_type, boxed):
     return 'void qapi_event_send_%(c_name)s(%(param)s)' % {
         'c_name': c_name(name.lower()),
-        'param': gen_params(arg_type, boxed, 'Error **errp')}
+        'param': build_params(arg_type, boxed, 'Error **errp')}
 
 
 def gen_event_send_decl(name, arg_type, boxed):
@@ -25,10 +25,10 @@ def gen_event_send_decl(name, arg_type, boxed):
 
 %(proto)s;
 ''',
-                 proto=gen_event_send_proto(name, arg_type, boxed))
+                 proto=build_event_send_proto(name, arg_type, boxed))
 
 
-# Declare and initialize an object 'qapi' using parameters from gen_params()
+# Declare and initialize an object 'qapi' using parameters from build_params()
 def gen_param_var(typ):
     assert not typ.variants
     ret = mcgen('''
@@ -42,7 +42,7 @@ def gen_param_var(typ):
         if memb.optional:
             ret += 'has_' + c_name(memb.name) + sep
         if memb.type.name == 'str':
-            # Cast away const added in gen_params()
+            # Cast away const added in build_params()
             ret += '(char *)'
         ret += c_name(memb.name)
     ret += mcgen('''
@@ -72,7 +72,7 @@ def gen_event_send(name, arg_type, boxed):
     Error *err = NULL;
     QMPEventFuncEmit emit;
 ''',
-                proto=gen_event_send_proto(name, arg_type, boxed))
+                proto=build_event_send_proto(name, arg_type, boxed))
 
     if arg_type and not arg_type.is_empty():
         ret += mcgen('''

scripts/qapi.py

@@ -1897,7 +1897,7 @@ extern const char *const %(c_name)s_lookup[];
     return ret
 
 
-def gen_params(arg_type, boxed, extra):
+def build_params(arg_type, boxed, extra):
     if not arg_type:
         assert not boxed
         return extra