From 51e72bc1dd6ace6e91d675f41a1f09bd00ab8043 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Fri, 29 Jan 2016 06:48:54 -0700 Subject: qapi: Swap visit_* arguments for consistent 'name' placement JSON uses "name":value, but many of our visitor interfaces were called with visit_type_FOO(v, &value, name, errp). This can be a bit confusing to have to mentally swap the parameter order to match JSON order. It's particularly bad for visit_start_struct(), where the 'name' parameter is smack in the middle of the otherwise-related group of 'obj, kind, size' parameters! It's time to do a global swap of the parameter ordering, so that the 'name' parameter is always immediately after the Visitor argument. Additional reason in favor of the swap: the existing include/qjson.h prefers listing 'name' first in json_prop_*(), and I have plans to unify that file with the qapi visitors; listing 'name' first in qapi will minimize churn to the (admittedly few) qjson.h clients. Later patches will then fix docs, object.h, visitor-impl.h, and those clients to match. Done by first patching scripts/qapi*.py by hand to make generated files do what I want, then by running the following Coccinelle script to affect the rest of the code base: $ spatch --sp-file script `git grep -l '\bvisit_' -- '**/*.[ch]'` I then had to apply some touchups (Coccinelle insisted on TAB indentation in visitor.h, and botched the signature of visit_type_enum() by rewriting 'const char *const strings[]' to the syntactically invalid 'const char*const[] strings'). The movement of parameters is sufficient to provoke compiler errors if any callers were missed. // Part 1: Swap declaration order @@ type TV, TErr, TObj, T1, T2; identifier OBJ, ARG1, ARG2; @@ void visit_start_struct -(TV v, TObj OBJ, T1 ARG1, const char *name, T2 ARG2, TErr errp) +(TV v, const char *name, TObj OBJ, T1 ARG1, T2 ARG2, TErr errp) { ... } @@ type bool, TV, T1; identifier ARG1; @@ bool visit_optional -(TV v, T1 ARG1, const char *name) +(TV v, const char *name, T1 ARG1) { ... } @@ type TV, TErr, TObj, T1; identifier OBJ, ARG1; @@ void visit_get_next_type -(TV v, TObj OBJ, T1 ARG1, const char *name, TErr errp) +(TV v, const char *name, TObj OBJ, T1 ARG1, TErr errp) { ... } @@ type TV, TErr, TObj, T1, T2; identifier OBJ, ARG1, ARG2; @@ void visit_type_enum -(TV v, TObj OBJ, T1 ARG1, T2 ARG2, const char *name, TErr errp) +(TV v, const char *name, TObj OBJ, T1 ARG1, T2 ARG2, TErr errp) { ... } @@ type TV, TErr, TObj; identifier OBJ; identifier VISIT_TYPE =~ "^visit_type_"; @@ void VISIT_TYPE -(TV v, TObj OBJ, const char *name, TErr errp) +(TV v, const char *name, TObj OBJ, TErr errp) { ... } // Part 2: swap caller order @@ expression V, NAME, OBJ, ARG1, ARG2, ERR; identifier VISIT_TYPE =~ "^visit_type_"; @@ ( -visit_start_struct(V, OBJ, ARG1, NAME, ARG2, ERR) +visit_start_struct(V, NAME, OBJ, ARG1, ARG2, ERR) | -visit_optional(V, ARG1, NAME) +visit_optional(V, NAME, ARG1) | -visit_get_next_type(V, OBJ, ARG1, NAME, ERR) +visit_get_next_type(V, NAME, OBJ, ARG1, ERR) | -visit_type_enum(V, OBJ, ARG1, ARG2, NAME, ERR) +visit_type_enum(V, NAME, OBJ, ARG1, ARG2, ERR) | -VISIT_TYPE(V, OBJ, NAME, ERR) +VISIT_TYPE(V, NAME, OBJ, ERR) ) Signed-off-by: Eric Blake Reviewed-by: Marc-André Lureau Message-Id: <1454075341-13658-19-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster --- scripts/qapi-visit.py | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) (limited to 'scripts/qapi-visit.py') diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py index ba75667e03..35505acd98 100644 --- a/scripts/qapi-visit.py +++ b/scripts/qapi-visit.py @@ -29,7 +29,7 @@ def gen_visit_decl(name, scalar=False): if not scalar: c_type += '*' return mcgen(''' -void visit_type_%(c_name)s(Visitor *v, %(c_type)sobj, const char *name, Error **errp); +void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_type)sobj, Error **errp); ''', c_name=c_name(name), c_type=c_type) @@ -118,11 +118,11 @@ def gen_visit_struct(name, base, members): # call qapi_free_FOO() to avoid a memory leak of the partial FOO. ret += mcgen(''' -void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error **errp) +void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp) { Error *err = NULL; - visit_start_struct(v, (void **)obj, "%(name)s", name, sizeof(%(c_name)s), &err); + visit_start_struct(v, name, (void **)obj, "%(name)s", sizeof(%(c_name)s), &err); if (err) { goto out; } @@ -150,7 +150,7 @@ def gen_visit_list(name, element_type): # call qapi_free_FOOList() to avoid a memory leak of the partial FOOList. return mcgen(''' -void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error **errp) +void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp) { Error *err = NULL; GenericList *i, **prev; @@ -164,7 +164,7 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error !err && (i = visit_next_list(v, prev, &err)) != NULL; prev = &i) { %(c_name)s *native_i = (%(c_name)s *)i; - visit_type_%(c_elt_type)s(v, &native_i->value, NULL, &err); + visit_type_%(c_elt_type)s(v, NULL, &native_i->value, &err); } error_propagate(errp, err); @@ -180,10 +180,10 @@ out: def gen_visit_enum(name): return mcgen(''' -void visit_type_%(c_name)s(Visitor *v, %(c_name)s *obj, const char *name, Error **errp) +void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s *obj, Error **errp) { int value = *obj; - visit_type_enum(v, &value, %(c_name)s_lookup, "%(name)s", name, errp); + visit_type_enum(v, name, &value, %(c_name)s_lookup, "%(name)s", errp); *obj = value; } ''', @@ -198,7 +198,7 @@ def gen_visit_alternate(name, variants): ret = mcgen(''' -void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error **errp) +void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp) { Error *err = NULL; @@ -206,7 +206,7 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error if (err) { goto out; } - visit_get_next_type(v, &(*obj)->type, %(promote_int)s, name, &err); + visit_get_next_type(v, name, &(*obj)->type, %(promote_int)s, &err); if (err) { goto out_obj; } @@ -217,7 +217,7 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error for var in variants.variants: ret += mcgen(''' case %(case)s: - visit_type_%(c_type)s(v, &(*obj)->u.%(c_name)s, name, &err); + visit_type_%(c_type)s(v, name, &(*obj)->u.%(c_name)s, &err); break; ''', case=var.type.alternate_qtype(), @@ -255,11 +255,11 @@ def gen_visit_union(name, base, variants): ret += mcgen(''' -void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error **errp) +void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp) { Error *err = NULL; - visit_start_struct(v, (void **)obj, "%(name)s", name, sizeof(%(c_name)s), &err); + visit_start_struct(v, name, (void **)obj, "%(name)s", sizeof(%(c_name)s), &err); if (err) { goto out; } @@ -276,7 +276,7 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error c_name=base.c_name()) else: ret += mcgen(''' - visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "%(name)s", &err); + visit_type_%(c_type)s(v, "%(name)s", &(*obj)->%(c_name)s, &err); ''', c_type=variants.tag_member.type.c_name(), c_name=c_name(variants.tag_member.name), @@ -300,7 +300,7 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error var.name)) if simple_union_type: ret += mcgen(''' - visit_type_%(c_type)s(v, &(*obj)->u.%(c_name)s, "data", &err); + visit_type_%(c_type)s(v, "data", &(*obj)->u.%(c_name)s, &err); ''', c_type=simple_union_type.c_name(), c_name=c_name(var.name)) -- cgit v1.2.3-55-g7522