[Qemu-devel] [PATCH v4 12/51] qapi-introspect: add preprocessor conditions to generated QLit

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

The generator will take (obj, condition) tuples to wrap generated QLit
objects for 'obj' with #if/#endif conditions.

This commit adds 'ifcond' condition to top-level QLit objects.

See generated tests/test-qmp-introspect.c. Example diff after this patch:

--- before	2018-01-08 11:55:24.757083654 +0100
+++ tests/test-qmp-introspect.c	2018-01-08 13:08:44.477641629 +0100
@@ -51,6 +51,8 @@
         { "name", QLIT_QSTR("EVENT_F"), },
         {}
     })),
+#if defined(TEST_IF_CMD)
+#if defined(TEST_IF_STRUCT)
     QLIT_QDICT(((QLitDictEntry[]) {
         { "arg-type", QLIT_QSTR("5"), },
         { "meta-type", QLIT_QSTR("command"), },
@@ -58,12 +60,16 @@
         { "ret-type", QLIT_QSTR("0"), },
         {}
     })),
+#endif /* defined(TEST_IF_STRUCT) */
+#endif /* defined(TEST_IF_CMD) */

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 scripts/qapi-introspect.py | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/scripts/qapi-introspect.py b/scripts/qapi-introspect.py
index b1d08ec97b..7d3a5c37fd 100644
--- a/scripts/qapi-introspect.py
+++ b/scripts/qapi-introspect.py
@@ -17,6 +17,15 @@ def to_qlit(obj, level=0, suppress_first_indent=False):
     def indent(level):
         return level * 4 * ' '
 
+    if isinstance(obj, tuple):
+        ifobj, ifcond = obj
+        ret = gen_if(ifcond)
+        ret += to_qlit(ifobj, level)
+        endif = gen_endif(ifcond)
+        if endif:
+            ret += '\n' + endif
+        return ret
+
     ret = ''
     if not suppress_first_indent:
         ret += indent(level)
@@ -25,7 +34,7 @@ def to_qlit(obj, level=0, suppress_first_indent=False):
     elif isinstance(obj, str):
         ret += 'QLIT_QSTR(' + to_c_string(obj) + ')'
     elif isinstance(obj, list):
-        elts = [to_qlit(elt, level + 1)
+        elts = [to_qlit(elt, level + 1).strip('\n')
                 for elt in obj]
         elts.append(indent(level + 1) + "{}")
         ret += 'QLIT_QLIST(((QLitObject[]) {\n'
@@ -121,12 +130,12 @@ const QLitObject %(c_name)s = %(c_string)s;
             return '[' + self._use_type(typ.element_type) + ']'
         return self._name(typ.name)
 
-    def _gen_qlit(self, name, mtype, obj):
+    def _gen_qlit(self, name, mtype, obj, ifcond):
         if mtype not in ('command', 'event', 'builtin', 'array'):
             name = self._name(name)
         obj['name'] = name
         obj['meta-type'] = mtype
-        self._qlits.append(obj)
+        self._qlits.append((obj, ifcond))
 
     def _gen_member(self, member):
         ret = {'name': member.name, 'type': self._use_type(member.type)}
@@ -142,26 +151,27 @@ const QLitObject %(c_name)s = %(c_string)s;
         return {'case': variant.name, 'type': self._use_type(variant.type)}
 
     def visit_builtin_type(self, name, info, json_type):
-        self._gen_qlit(name, 'builtin', {'json-type': json_type})
+        self._gen_qlit(name, 'builtin', {'json-type': json_type}, [])
 
     def visit_enum_type(self, name, info, ifcond, values, prefix):
-        self._gen_qlit(name, 'enum', {'values': values})
+        self._gen_qlit(name, 'enum', {'values': values}, ifcond)
 
     def visit_array_type(self, name, info, ifcond, element_type):
         element = self._use_type(element_type)
-        self._gen_qlit('[' + element + ']', 'array', {'element-type': element})
+        self._gen_qlit('[' + element + ']', 'array', {'element-type': element},
+                       ifcond)
 
     def visit_object_type_flat(self, name, info, ifcond, members, variants):
         obj = {'members': [self._gen_member(m) for m in members]}
         if variants:
             obj.update(self._gen_variants(variants.tag_member.name,
                                           variants.variants))
-        self._gen_qlit(name, 'object', obj)
+        self._gen_qlit(name, 'object', obj, ifcond)
 
     def visit_alternate_type(self, name, info, ifcond, variants):
         self._gen_qlit(name, 'alternate',
                        {'members': [{'type': self._use_type(m.type)}
-                                    for m in variants.variants]})
+                                    for m in variants.variants]}, ifcond)
 
     def visit_command(self, name, info, ifcond, arg_type, ret_type,
                       gen, success_response, boxed):
@@ -169,11 +179,12 @@ const QLitObject %(c_name)s = %(c_string)s;
         ret_type = ret_type or self._schema.the_empty_object_type
         self._gen_qlit(name, 'command',
                        {'arg-type': self._use_type(arg_type),
-                        'ret-type': self._use_type(ret_type)})
+                        'ret-type': self._use_type(ret_type)}, ifcond)
 
     def visit_event(self, name, info, ifcond, arg_type, boxed):
         arg_type = arg_type or self._schema.the_empty_object_type
-        self._gen_qlit(name, 'event', {'arg-type': self._use_type(arg_type)})
+        self._gen_qlit(name, 'event', {'arg-type': self._use_type(arg_type)},
+                       ifcond)
 
 # Debugging aid: unmask QAPI schema's type names
 # We normally mask them, because they're not QMP wire ABI
-- 
2.16.0.rc1.1.gef27df75a1