qapi: Generate separate .h, .c for each module

Our qapi-schema.json is composed of modules connected by include
directives, but the generated code is monolithic all the same: one
qapi-types.h with all the types, one qapi-visit.h with all the
visitors, and so forth.  These monolithic headers get included all
over the place.  In my "build everything" tree, adding a QAPI type
recompiles about 4800 out of 5100 objects.

We wouldn't write such monolithic headers by hand.  It stands to
reason that we shouldn't generate them, either.

Split up generated qapi-types.h to mirror the schema's modular
structure: one header per module.  Name the main module's header
qapi-types.h, and sub-module D/B.json's header D/qapi-types-B.h.

Mirror the schema's includes in the headers, so that qapi-types.h gets
you everything exactly as before.  If you need less, you can include
one or more of the sub-module headers.  To be exploited shortly.

Split up qapi-types.c, qapi-visit.h, qapi-visit.c, qmp-commands.h,
qmp-commands.c, qapi-event.h, qapi-event.c the same way.
qmp-introspect.h, qmp-introspect.c and qapi.texi remain monolithic.

The split of qmp-commands.c duplicates static helper function
qmp_marshal_output_str() in qapi-commands-char.c and
qapi-commands-misc.c.  This happens when commands returning the same
type occur in multiple modules.  Not worth avoiding.

Since I'm going to rename qapi-event.[ch] to qapi-events.[ch], and
qmp-commands.[ch] to qapi-commands.[ch], name the shards that way
already, to reduce churn.  This requires temporary hacks in
commands.py and events.py.  Similarly, c_name() must temporarily
be taught to munge '/' in common.py.  They'll go away with the rename.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180211093607.27351-23-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: declare a dummy variable in each .c file, to shut up OSX
toolchain warnings about empty .o files, including hacking c_name()]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 28 insertions, 5 deletions

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 069ec3715d..e0b88f1896 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -1775,10 +1775,11 @@ def c_enum_const(type_name, const_name, prefix=None):
         type_name = prefix
     return camel_to_upper(type_name) + '_' + c_name(const_name, False).upper()
 
+# Temporary HACK for '/':
 if hasattr(str, 'maketrans'):
-    c_name_trans = str.maketrans('.-', '__')
+    c_name_trans = str.maketrans('.-/', '___')
 else:
-    c_name_trans = string.maketrans('.-', '__')
+    c_name_trans = string.maketrans('.-/', '___')
 
 
 # Map @name to a valid C identifier.
@@ -2035,6 +2036,13 @@ class QAPIGenC(QAPIGen):
 ''',
                      blurb=self._blurb, copyright=self._copyright)
 
+    def _bottom(self, fname):
+        return mcgen('''
+/* Dummy declaration to prevent empty .o file */
+char dummy_%(name)s;
+''',
+                     name=c_name(fname))
+
 
 class QAPIGenH(QAPIGenC):
 
@@ -2073,13 +2081,20 @@ class QAPISchemaModularCVisitor(QAPISchemaVisitor):
         self._blurb = blurb
         self._pydoc = pydoc
         self._module = {}
+        self._main_module = None
 
     def _module_basename(self, what, name):
         if name is None:
             return re.sub(r'-', '-builtin-', what)
-        return self._prefix + what
+        basename = os.path.join(os.path.dirname(name),
+                                self._prefix + what)
+        if name == self._main_module:
+            return basename
+        return basename + '-' + os.path.splitext(os.path.basename(name))[0]
 
     def _add_module(self, name, blurb):
+        if self._main_module is None and name is not None:
+            self._main_module = name
         genc = QAPIGenC(blurb, self._pydoc)
         genh = QAPIGenH(blurb, self._pydoc)
         self._module[name] = (genc, genh)
@@ -2088,7 +2103,7 @@ class QAPISchemaModularCVisitor(QAPISchemaVisitor):
     def _set_module(self, name):
         self._genc, self._genh = self._module[name]
 
-    def write(self, output_dir, opt_builtins):
+    def write(self, output_dir, opt_builtins=False):
         for name in self._module:
             if name is None and not opt_builtins:
                 continue
@@ -2101,7 +2116,15 @@ class QAPISchemaModularCVisitor(QAPISchemaVisitor):
         pass
 
     def visit_module(self, name):
-        if len(self._module) != 1:
+        if name in self._module:
+            self._set_module(name)
             return
         self._add_module(name, self._blurb)
         self._begin_module(name)
+
+    def visit_include(self, name, info):
+        basename = self._module_basename(self._what, name)
+        self._genh.preamble_add(mcgen('''
+#include "%(basename)s.h"
+''',
+                                      basename=basename))