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qapi: Don't let implicit enum MAX member collide

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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.

Backports commit 7fb1cf1606c78c9d5b538f29176fd5a101726a9d from qemu
This commit is contained in:
Eric Blake 2018-02-19 20:34:51 -05:00 committed by Lioncash
parent 00e596aad2
commit 9ca55f4ba5
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 3 additions and 3 deletions
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6
qemu/scripts/qapi.py
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@ -920,7 +920,7 @@ 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):
@ -1570,7 +1570,7 @@ const char *const %(c_name)s_lookup[] = {
# Unicorn: We don't use C99 [ARRAY_INDICING] = Thing because
# MSVC is still in the stone-age with this part of C compiler
# support.
max_index = c_enum_const(name, 'MAX', prefix)
max_index = c_enum_const(name, '_MAX', prefix)
ret += mcgen('''
NULL,
};
@ -1581,7 +1581,7 @@ 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('''
typedef enum %(c_name)s {