qapi: Don't let implicit enum MAX member collide

Now that we guarantee the user doesn't have any enum values
beginning with a single underscore, we can use that for our
own purposes.  Renaming ENUM_MAX to ENUM__MAX makes it obvious
that the sentinel is generated.

This patch was mostly generated by applying a temporary patch:

|diff --git a/scripts/qapi.py b/scripts/qapi.py
|index e6d014b..b862ec9 100644
|--- a/scripts/qapi.py
|+++ b/scripts/qapi.py
|@@ -1570,6 +1570,7 @@ const char *const %(c_name)s_lookup[] = {
|     max_index = c_enum_const(name, 'MAX', prefix)
|     ret += mcgen('''
|     [%(max_index)s] = NULL,
|+// %(max_index)s
| };
| ''',
|                max_index=max_index)

then running:

$ cat qapi-{types,event}.c tests/test-qapi-types.c |
    sed -n 's,^// \(.*\)MAX,s|\1MAX|\1_MAX|g,p' > list
$ git grep -l _MAX | xargs sed -i -f list

The only things not generated are the changes in scripts/qapi.py.

Rejecting enum members named 'MAX' is now useless, and will be dropped
in the next patch.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1447836791-369-23-git-send-email-eblake@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
[Rebased to current master, commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 3e5caa8193..9c541e0312 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -918,7 +918,7 @@ class QAPISchemaEnumType(QAPISchemaType):
         return c_name(self.name)
 
     def c_null(self):
-        return c_enum_const(self.name, (self.values + ['MAX'])[0],
+        return c_enum_const(self.name, (self.values + ['_MAX'])[0],
                             self.prefix)
 
     def json_type(self):
@@ -1568,7 +1568,7 @@ const char *const %(c_name)s_lookup[] = {
 ''',
                      index=index, value=value)
 
-    max_index = c_enum_const(name, 'MAX', prefix)
+    max_index = c_enum_const(name, '_MAX', prefix)
     ret += mcgen('''
     [%(max_index)s] = NULL,
 };
@@ -1579,7 +1579,7 @@ const char *const %(c_name)s_lookup[] = {
 
 def gen_enum(name, values, prefix=None):
     # append automatically generated _MAX value
-    enum_values = values + ['MAX']
+    enum_values = values + ['_MAX']
 
     ret = mcgen('''