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qapi: Avoid use of misnamed DO_UPCAST()

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The macro DO_UPCAST() is incorrectly named: it converts from a
parent class to a derived class (which is a downcast). Better,
and more consistent with some of the other qapi visitors, is
to use the container_of() macro through a to_FOO() helper. Names
like 'to_ov()' may be a bit short, but for a static helper it
doesn't hurt too much, and matches existing practice in files
like qmp-input-visitor.c.

Our current definition of container_of() is weaker than
DO_UPCAST(), in that it does not require the derived class to
have Visitor as its first member, but this does not hurt our
usage patterns in qapi visitors.

Backports commit d7bea75d35a44023efc9d481d3a1a2600677b2ef from qemu
This commit is contained in:
Eric Blake 2018-02-19 11:47:12 -05:00 committed by Lioncash
parent 292c67109a
commit 8f8064dc80
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 13 additions and 8 deletions
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21
qemu/qapi/string-input-visitor.c
View file

@ -33,6 +33,11 @@ struct StringInputVisitor
const char *string;
};
static StringInputVisitor *to_siv(Visitor *v)
{
return container_of(v, StringInputVisitor, visitor);
}
static void free_range(void *range, void *dummy)
{
g_free(range);
@ -121,7 +126,7 @@ error:
static void
start_list(Visitor *v, const char *name, Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
parse_str(siv, errp);
@ -137,7 +142,7 @@ start_list(Visitor *v, const char *name, Error **errp)
static GenericList *
next_list(Visitor *v, GenericList **list, Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
GenericList **link;
Range *r;
@ -176,14 +181,14 @@ next_list(Visitor *v, GenericList **list, Error **errp)
static void
end_list(Visitor *v, Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
siv->head = true;
}
static void parse_type_int(Visitor *v, int64_t *obj, const char *name,
Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
if (!siv->string) {
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
@ -225,7 +230,7 @@ error:
static void parse_type_bool(Visitor *v, bool *obj, const char *name,
Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
if (siv->string) {
if (!strcasecmp(siv->string, "on") ||
@ -249,7 +254,7 @@ static void parse_type_bool(Visitor *v, bool *obj, const char *name,
static void parse_type_str(Visitor *v, char **obj, const char *name,
Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
if (siv->string) {
*obj = g_strdup(siv->string);
} else {
@ -261,7 +266,7 @@ static void parse_type_str(Visitor *v, char **obj, const char *name,
static void parse_type_number(Visitor *v, double *obj, const char *name,
Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
char *endp = (char *) siv->string;
double val;
@ -281,7 +286,7 @@ static void parse_type_number(Visitor *v, double *obj, const char *name,
static void parse_optional(Visitor *v, bool *present, const char *name,
Error **errp)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
StringInputVisitor *siv = to_siv(v);
if (!siv->string) {
*present = false;