[Qemu-devel] [PATCH v2 2/2] qapi: Add comments to aid debugging generated introspection

[Eric Blake]

We consciously chose in commit 1a9a507b to hide QAPI type names
from the introspection output on the wire, but added a command
line option -u to unmask the type name when doing a debug build.
The unmask option still remains useful to some other forms of
automated analysis, so it will not be removed; however, when it
is not in use, the generated .c file can be hard to read.  At
the time when we first introduced masking, the generated file
consisted only of a monolithic C string, so there was no clean
way to inject any comments.

Later, in commit 7d0f982b, we switched the generation to output
a QLit object, in part to make it easier for future addition of
conditional compilation.  In fact, commit d626b6c1 took advantage
of this by passing a tuple instead of a bare object for encoding
the output of conditionals.  By extending that tuple, we can now
interject strategic comments.

For now, type name debug aid comments are only output once per
meta-type, rather than at all uses of the number used to encode
the type within the introspection data.  But this is still a lot
more convenient than having to regenerate the file with the
unmask operation temporarily turned on - merely search the
generated file for '"NNN" =' to learn the corresponding source
name and associated definition of type NNN.

The generated qapi-introspect.c changes only with the addition
of comments, such as:

| @@ -14755,6 +15240,7 @@
|          { "name", QLIT_QSTR("[485]"), },
|          {}
|      })),
| +    /* "485" = QCryptoBlockInfoLUKSSlot */
|      QLIT_QDICT(((QLitDictEntry[]) {
|          { "members", QLIT_QLIST(((QLitObject[]) {
|              QLIT_QDICT(((QLitDictEntry[]) {

Signed-off-by: Eric Blake <address@hidden>

---
v2: rebase on conditional code additions, drop patch to remove -u,
update documentation to match
---
 docs/devel/qapi-code-gen.txt |  1 +
 scripts/qapi/introspect.py   | 27 +++++++++++++++++++++------
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt
index c2e11465f0f..9d5b1409e72 100644
--- a/docs/devel/qapi-code-gen.txt
+++ b/docs/devel/qapi-code-gen.txt
@@ -1412,6 +1412,7 @@ Example:
             { "name", QLIT_QSTR("Event") },
             { }
         })),
+        /* "0" = q_empty */
         QLIT_QDICT(((QLitDictEntry[]) {
             { "members", QLIT_QLIST(((QLitObject[]) {
                 { }
diff --git a/scripts/qapi/introspect.py b/scripts/qapi/introspect.py
index 43e81a06938..67d6106f77b 100644
--- a/scripts/qapi/introspect.py
+++ b/scripts/qapi/introspect.py
@@ -19,12 +19,17 @@ def to_qlit(obj, level=0, suppress_first_indent=False):
         return level * 4 * ' '

     if isinstance(obj, tuple):
-        ifobj, ifcond = obj
-        ret = gen_if(ifcond)
+        ifobj, extra = obj
+        ifcond = extra.get('if')
+        comment = extra.get('comment')
+        ret = ''
+        if comment:
+            ret += indent(level) + '/* %s */\n' % comment
+        if ifcond:
+            ret += gen_if(ifcond)
         ret += to_qlit(ifobj, level)
-        endif = gen_endif(ifcond)
-        if endif:
-            ret += '\n' + endif
+        if ifcond:
+            ret += '\n' + gen_endif(ifcond)
         return ret

     ret = ''
@@ -137,11 +142,21 @@ const QLitObject %(c_name)s = %(c_string)s;
         return self._name(typ.name)

     def _gen_qlit(self, name, mtype, obj, ifcond):
+        extra = {}
         if mtype not in ('command', 'event', 'builtin', 'array'):
+            if not self._unmask:
+                # Output a comment to make it easy to map masked names
+                # back to the source when reading the generated output.
+                extra['comment'] = '"%s" = %s' % (self._name(name), name)
             name = self._name(name)
         obj['name'] = name
         obj['meta-type'] = mtype
-        self._qlits.append((obj, ifcond))
+        if ifcond:
+            extra['if'] = ifcond
+        if extra:
+            self._qlits.append((obj, extra))
+        else:
+            self._qlits.append(obj)

     def _gen_member(self, member):
         ret = {'name': member.name, 'type': self._use_type(member.type)}
-- 
2.17.1