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qapi/types qapi/visit: Generate built-in stuff into separate files

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Linking code from multiple separate QAPI schemata into the same
program is possible, but involves some weirdness around built-in
types:

* We generate code for built-in types into .c only with option
  --builtins.  The user is responsible for generating code for exactly
  one QAPI schema per program with --builtins.

* We generate code for built-in types into .h regardless of
  --builtins, but guarded by #ifndef QAPI_VISIT_BUILTIN.  Because all
  copies of this code are exactly the same, including any combination
  of these headers works.

Replace this contraption by something more conventional: generate code
for built-in types into their very own files: qapi-builtin-types.c,
qapi-builtin-visit.c, qapi-builtin-types.h, qapi-builtin-visit.h, but
only with --builtins.  Obey --output-dir, but ignore --prefix for
them.

Make qapi-types.h include qapi-builtin-types.h.  With multiple
schemata you now have multiple qapi-types.[ch], but only one
qapi-builtin-types.[ch].  Same for qapi-visit.[ch] and
qapi-builtin-visit.[ch].

Bonus: if all you need is built-in stuff, you can include a much
smaller header.  To be exploited shortly.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180211093607.27351-21-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
[eblake: fix octal constant for python 3]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Markus Armbruster 2018-02-26 16:29:21 -06:00 committed by Eric Blake
parent 71b3f0459c
commit cdb6610ae4
6 changed files with 115 additions and 87 deletions
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2
.gitignore vendored
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@ -29,6 +29,8 @@
/qga/qapi-generated
/qapi-generated
/qapi-gen-timestamp
/qapi-builtin-types.[ch]
/qapi-builtin-visit.[ch]
/qapi-types.[ch]
/qapi-visit.[ch]
/qapi-event.[ch]

13
Makefile
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@ -90,10 +90,13 @@ endif
include $(SRC_PATH)/rules.mak
GENERATED_FILES = qemu-version.h config-host.h qemu-options.def
GENERATED_FILES += qmp-commands.h qapi-types.h qapi-visit.h qapi-event.h
GENERATED_FILES += qmp-commands.c qapi-types.c qapi-visit.c qapi-event.c
GENERATED_FILES += qmp-introspect.h
GENERATED_FILES += qmp-introspect.c
GENERATED_FILES += qapi-builtin-types.h qapi-builtin-types.c
GENERATED_FILES += qapi-types.h qapi-types.c
GENERATED_FILES += qapi-builtin-visit.h qapi-builtin-visit.c
GENERATED_FILES += qapi-visit.h qapi-visit.c
GENERATED_FILES += qmp-commands.h qmp-commands.c
GENERATED_FILES += qapi-event.h qapi-event.c
GENERATED_FILES += qmp-introspect.c qmp-introspect.h
GENERATED_FILES += qapi-doc.texi
GENERATED_FILES += trace/generated-tcg-tracers.h
@ -519,7 +522,9 @@ qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
$(SRC_PATH)/qapi/transaction.json \
$(SRC_PATH)/qapi/ui.json
qapi-builtin-types.c qapi-builtin-types.h \
qapi-types.c qapi-types.h \
qapi-builtin-visit.c qapi-builtin-visit.h \
qapi-visit.c qapi-visit.h \
qmp-commands.h qmp-commands.c \
qapi-event.c qapi-event.h \

2
Makefile.objs
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@ -2,6 +2,8 @@
# Common libraries for tools and emulators
stub-obj-y = stubs/ crypto/
util-obj-y = util/ qobject/ qapi/
util-obj-y += qapi-builtin-types.o
util-obj-y += qapi-builtin-visit.o
util-obj-y += qmp-introspect.o qapi-types.o qapi-visit.o qapi-event.o
chardev-obj-y = chardev/

60
scripts/qapi/common.py
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@ -1531,11 +1531,10 @@ class QAPISchema(object):
def _def_builtin_type(self, name, json_type, c_type):
self._def_entity(QAPISchemaBuiltinType(name, json_type, c_type))
# TODO As long as we have QAPI_TYPES_BUILTIN to share multiple
# qapi-types.h from a single .c, all arrays of builtins must be
# declared in the first file whether or not they are used. Nicer
# would be to use lazy instantiation, while figuring out how to
# avoid compilation issues with multiple qapi-types.h.
# Instantiating only the arrays that are actually used would
# be nice, but we can't as long as their generated code
# (qapi-builtin-types.[ch]) may be shared by some other
# schema.
self._make_array_type(name, None)
def _def_predefineds(self):
@ -1992,14 +1991,15 @@ class QAPIGen(object):
return ''
def write(self, output_dir, fname):
if output_dir:
pathname = os.path.join(output_dir, fname)
dir = os.path.dirname(pathname)
if dir:
try:
os.makedirs(output_dir)
os.makedirs(dir)
except os.error as e:
if e.errno != errno.EEXIST:
raise
fd = os.open(os.path.join(output_dir, fname),
os.O_RDWR | os.O_CREAT, 0o666)
fd = os.open(pathname, os.O_RDWR | os.O_CREAT, 0o666)
f = os.fdopen(fd, 'r+')
text = (self._top(fname) + self._preamble + self._body
+ self._bottom(fname))
@ -2063,3 +2063,45 @@ class QAPISchemaMonolithicCVisitor(QAPISchemaVisitor):
def write(self, output_dir):
self._genc.write(output_dir, self._prefix + self._what + '.c')
self._genh.write(output_dir, self._prefix + self._what + '.h')
class QAPISchemaModularCVisitor(QAPISchemaVisitor):
def __init__(self, prefix, what, blurb, pydoc):
self._prefix = prefix
self._what = what
self._blurb = blurb
self._pydoc = pydoc
self._module = {}
def _module_basename(self, what, name):
if name is None:
return re.sub(r'-', '-builtin-', what)
return self._prefix + what
def _add_module(self, name, blurb):
genc = QAPIGenC(blurb, self._pydoc)
genh = QAPIGenH(blurb, self._pydoc)
self._module[name] = (genc, genh)
self._set_module(name)
def _set_module(self, name):
self._genc, self._genh = self._module[name]
def write(self, output_dir, opt_builtins):
for name in self._module:
if name is None and not opt_builtins:
continue
basename = self._module_basename(self._what, name)
(genc, genh) = self._module[name]
genc.write(output_dir, basename + '.c')
genh.write(output_dir, basename + '.h')
def _begin_module(self, name):
pass
def visit_module(self, name):
if len(self._module) != 1:
return
self._add_module(name, self._blurb)
self._begin_module(name)

61
scripts/qapi/types.py
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@ -167,64 +167,51 @@ void qapi_free_%(c_name)s(%(c_name)s *obj)
return ret
class QAPISchemaGenTypeVisitor(QAPISchemaMonolithicCVisitor):
class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor):
def __init__(self, prefix, opt_builtins):
QAPISchemaMonolithicCVisitor.__init__(
def __init__(self, prefix):
QAPISchemaModularCVisitor.__init__(
self, prefix, 'qapi-types', ' * Schema-defined QAPI types',
__doc__)
self._opt_builtins = opt_builtins
self._add_module(None, ' * Built-in QAPI types')
self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qapi/dealloc-visitor.h"
#include "qapi-builtin-types.h"
#include "qapi-builtin-visit.h"
'''))
self._genh.preamble_add(mcgen('''
#include "qapi/util.h"
'''))
def _begin_module(self, name):
self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qapi/dealloc-visitor.h"
#include "%(prefix)sqapi-types.h"
#include "%(prefix)sqapi-visit.h"
''',
prefix=prefix))
prefix=self._prefix))
self._genh.preamble_add(mcgen('''
#include "qapi/util.h"
#include "qapi-builtin-types.h"
'''))
self._btin = '\n' + guardstart('QAPI_TYPES_BUILTIN')
def visit_begin(self, schema):
# gen_object() is recursive, ensure it doesn't visit the empty type
objects_seen.add(schema.the_empty_object_type.name)
def visit_end(self):
# To avoid header dependency hell, we always generate
# declarations for built-in types in our header files and
# simply guard them. See also opt_builtins (command line
# option -b).
self._btin += guardend('QAPI_TYPES_BUILTIN')
self._genh.preamble_add(self._btin)
self._btin = None
def _gen_type_cleanup(self, name):
self._genh.add(gen_type_cleanup_decl(name))
self._genc.add(gen_type_cleanup(name))
def visit_enum_type(self, name, info, values, prefix):
# Special case for our lone builtin enum type
# TODO use something cleaner than existence of info
if not info:
self._btin += gen_enum(name, values, prefix)
if self._opt_builtins:
self._genc.add(gen_enum_lookup(name, values, prefix))
else:
self._genh.preamble_add(gen_enum(name, values, prefix))
self._genc.add(gen_enum_lookup(name, values, prefix))
self._genh.preamble_add(gen_enum(name, values, prefix))
self._genc.add(gen_enum_lookup(name, values, prefix))
def visit_array_type(self, name, info, element_type):
if isinstance(element_type, QAPISchemaBuiltinType):
self._btin += gen_fwd_object_or_array(name)
self._btin += gen_array(name, element_type)
self._btin += gen_type_cleanup_decl(name)
if self._opt_builtins:
self._genc.add(gen_type_cleanup(name))
else:
self._genh.preamble_add(gen_fwd_object_or_array(name))
self._genh.add(gen_array(name, element_type))
self._gen_type_cleanup(name)
self._genh.preamble_add(gen_fwd_object_or_array(name))
self._genh.add(gen_array(name, element_type))
self._gen_type_cleanup(name)
def visit_object_type(self, name, info, base, members, variants):
# Nothing to do for the special empty builtin
@ -248,6 +235,6 @@ class QAPISchemaGenTypeVisitor(QAPISchemaMonolithicCVisitor):
def gen_types(schema, output_dir, prefix, opt_builtins):
vis = QAPISchemaGenTypeVisitor(prefix, opt_builtins)
vis = QAPISchemaGenTypeVisitor(prefix)
schema.visit(vis)
vis.write(output_dir)
vis.write(output_dir, opt_builtins)

64
scripts/qapi/visit.py
View File

@ -263,13 +263,27 @@ out:
c_name=c_name(name))
class QAPISchemaGenVisitVisitor(QAPISchemaMonolithicCVisitor):
class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
def __init__(self, prefix, opt_builtins):
QAPISchemaMonolithicCVisitor.__init__(
def __init__(self, prefix):
QAPISchemaModularCVisitor.__init__(
self, prefix, 'qapi-visit', ' * Schema-defined QAPI visitors',
__doc__)
self._opt_builtins = opt_builtins
self._add_module(None, ' * Built-in QAPI visitors')
self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qapi-builtin-visit.h"
'''))
self._genh.preamble_add(mcgen('''
#include "qapi/visitor.h"
#include "qapi-builtin-types.h"
''',
prefix=prefix))
def _begin_module(self, name):
self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qemu-common.h"
@ -277,45 +291,21 @@ class QAPISchemaGenVisitVisitor(QAPISchemaMonolithicCVisitor):
#include "qapi/qmp/qerror.h"
#include "%(prefix)sqapi-visit.h"
''',
prefix=prefix))
prefix=self._prefix))
self._genh.preamble_add(mcgen('''
#include "qapi/visitor.h"
#include "qapi-builtin-visit.h"
#include "%(prefix)sqapi-types.h"
''',
prefix=prefix))
self._btin = guardstart('QAPI_VISIT_BUILTIN')
def visit_end(self):
# To avoid header dependency hell, we always generate
# declarations for built-in types in our header files and
# simply guard them. See also opt_builtins (command line
# option -b).
self._btin += guardend('QAPI_VISIT_BUILTIN')
self._genh.preamble_add(self._btin)
self._btin = None
prefix=self._prefix))
def visit_enum_type(self, name, info, values, prefix):
# Special case for our lone builtin enum type
# TODO use something cleaner than existence of info
if not info:
self._btin += gen_visit_decl(name, scalar=True)
if self._opt_builtins:
self._genc.add(gen_visit_enum(name))
else:
self._genh.add(gen_visit_decl(name, scalar=True))
self._genc.add(gen_visit_enum(name))
self._genh.add(gen_visit_decl(name, scalar=True))
self._genc.add(gen_visit_enum(name))
def visit_array_type(self, name, info, element_type):
decl = gen_visit_decl(name)
defn = gen_visit_list(name, element_type)
if isinstance(element_type, QAPISchemaBuiltinType):
self._btin += decl
if self._opt_builtins:
self._genc.add(defn)
else:
self._genh.add(decl)
self._genc.add(defn)
self._genh.add(gen_visit_decl(name))
self._genc.add(gen_visit_list(name, element_type))
def visit_object_type(self, name, info, base, members, variants):
# Nothing to do for the special empty builtin
@ -336,6 +326,6 @@ class QAPISchemaGenVisitVisitor(QAPISchemaMonolithicCVisitor):
def gen_visit(schema, output_dir, prefix, opt_builtins):
vis = QAPISchemaGenVisitVisitor(prefix, opt_builtins)
vis = QAPISchemaGenVisitVisitor(prefix)
schema.visit(vis)
vis.write(output_dir)
vis.write(output_dir, opt_builtins)