From cdb6610ae4283720037bae2af1f78bd40eb5fe71 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Mon, 26 Feb 2018 16:29:21 -0600 Subject: qapi/types qapi/visit: Generate built-in stuff into separate files 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 Message-Id: <20180211093607.27351-21-armbru@redhat.com> Reviewed-by: Eric Blake Reviewed-by: Marc-André Lureau Reviewed-by: Michael Roth [eblake: fix octal constant for python 3] Signed-off-by: Eric Blake --- scripts/qapi/visit.py | 64 ++++++++++++++++++++++----------------------------- 1 file changed, 27 insertions(+), 37 deletions(-) (limited to 'scripts/qapi/visit.py') diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py index 3d09d44265..9b678e7263 100644 --- a/scripts/qapi/visit.py +++ b/scripts/qapi/visit.py @@ -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) -- cgit v1.2.3-55-g7522