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Re: [Qemu-devel] [PATCH v3 14/49] qapi-types: add #if conditions to type
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH v3 14/49] qapi-types: add #if conditions to types & visitors |
Date: |
Thu, 21 Jun 2018 18:12:39 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Marc-André Lureau <address@hidden> writes:
> Types & visitors are coupled and must be handled together to avoid
> temporary build regression.
>
> Wrap generated types/visitor code with #if/#endif using the context
> helpers.
>
> Signed-off-by: Marc-André Lureau <address@hidden>
> ---
> scripts/qapi/types.py | 46 ++++++++++++++++++++++++++-----------------
> scripts/qapi/visit.py | 33 ++++++++++++++++++-------------
> 2 files changed, 47 insertions(+), 32 deletions(-)
>
> diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py
> index 3d9b0f9a07..ce4c91206c 100644
> --- a/scripts/qapi/types.py
> +++ b/scripts/qapi/types.py
> @@ -61,8 +61,10 @@ def gen_variants_objects(variants):
> for v in variants.variants:
> if isinstance(v.type, QAPISchemaObjectType):
> ret += gen_variants_objects(v.type.variants)
> + ret += gen_if(v.type.ifcond)
> ret += gen_object(v.type.name, v.type.base,
> v.type.local_members, v.type.variants)
> + ret += gen_endif(v.type.ifcond)
Ignorant question out of curiosity, why is with ifcontext() not usable
here?
> return ret
>
>
> @@ -206,41 +208,49 @@ class
> QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor):
> # gen_object() is recursive, ensure it doesn't visit the empty type
> objects_seen.add(schema.the_empty_object_type.name)
>
> - def _gen_type_cleanup(self, name):
> - self._genh.add(gen_type_cleanup_decl(name))
> - self._genc.add(gen_type_cleanup(name))
> + def _gen_type_cleanup(self, name, ifcond):
> + with ifcontext(ifcond, self._genh, self._genc):
> + self._genh.add(gen_type_cleanup_decl(name))
> + self._genc.add(gen_type_cleanup(name))
>
> def visit_enum_type(self, name, info, ifcond, values, prefix):
> - self._genh.preamble_add(gen_enum(name, values, prefix))
> - self._genc.add(gen_enum_lookup(name, values, prefix))
> + with ifcontext(ifcond, self._genh, self._genc):
> + 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, ifcond, element_type):
> - self._genh.preamble_add(gen_fwd_object_or_array(name))
> - self._genh.add(gen_array(name, element_type))
> - self._gen_type_cleanup(name)
> + with ifcontext(ifcond, self._genh):
> + self._genh.preamble_add(gen_fwd_object_or_array(name))
> + self._genh.add(gen_array(name, element_type))
> + self._gen_type_cleanup(name, ifcond)
>
> def _gen_object(self, name, info, ifcond, base, members, variants):
> - self._genh.add(gen_object(name, base, members, variants))
> - if base and not base.is_implicit():
> - self._genh.add(gen_upcast(name, base))
> - # TODO Worth changing the visitor signature, so we could
> - # directly use rather than repeat type.is_implicit()?
> + with ifcontext(ifcond, self._genh):
> + self._genh.add(gen_object(name, base, members, variants))
> + if base and not base.is_implicit():
> + self._genh.add(gen_upcast(name, base))
> + # TODO Worth changing the visitor signature, so we could
> + # directly use rather than repeat type.is_implicit()?
> if not name.startswith('q_'):
> # implicit types won't be directly allocated/freed
> - self._gen_type_cleanup(name)
> + self._gen_type_cleanup(name, ifcond)
> +
> + def _gen_fwd_object_or_array(self, name, ifcond):
> + with ifcontext(ifcond, self._genh):
> + self._genh.preamble_add(gen_fwd_object_or_array(name))
>
> def visit_object_type(self, name, info, ifcond, base, members, variants):
> # Nothing to do for the special empty builtin
> if name == 'q_empty':
> return
> - self._genh.preamble_add(gen_fwd_object_or_array(name))
> + self._gen_fwd_object_or_array(name, ifcond)
> self._genh.add(gen_variants_objects(variants))
> - self._gen_object(name, info, None, base, members, variants)
> + self._gen_object(name, info, ifcond, base, members, variants)
>
> def visit_alternate_type(self, name, info, ifcond, variants):
> - self._genh.preamble_add(gen_fwd_object_or_array(name))
> + self._gen_fwd_object_or_array(name, ifcond)
> self._genh.add(gen_variants_objects(variants))
> - self._gen_object(name, info, None, None,
> + self._gen_object(name, info, ifcond, None,
> [variants.tag_member], variants)
>
>
> diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
> index 9ea2e04f81..e4a62ce030 100644
> --- a/scripts/qapi/visit.py
> +++ b/scripts/qapi/visit.py
> @@ -302,29 +302,34 @@ class
> QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
> types=types))
>
> def visit_enum_type(self, name, info, ifcond, values, prefix):
> - self._genh.add(gen_visit_decl(name, scalar=True))
> - self._genc.add(gen_visit_enum(name))
> + with ifcontext(ifcond, self._genh, self._genc):
> + self._genh.add(gen_visit_decl(name, scalar=True))
> + self._genc.add(gen_visit_enum(name))
>
> def visit_array_type(self, name, info, ifcond, element_type):
> - self._genh.add(gen_visit_decl(name))
> - self._genc.add(gen_visit_list(name, element_type))
> + with ifcontext(ifcond, self._genh, self._genc):
> + self._genh.add(gen_visit_decl(name))
> + self._genc.add(gen_visit_list(name, element_type))
>
> def visit_object_type(self, name, info, ifcond, base, members, variants):
> # Nothing to do for the special empty builtin
> if name == 'q_empty':
> return
> - self._genh.add(gen_visit_members_decl(name))
> - self._genc.add(gen_visit_object_members(name, base, members,
> variants))
> - # TODO Worth changing the visitor signature, so we could
> - # directly use rather than repeat type.is_implicit()?
> - if not name.startswith('q_'):
> - # only explicit types need an allocating visit
> - self._genh.add(gen_visit_decl(name))
> - self._genc.add(gen_visit_object(name, base, members, variants))
> + with ifcontext(ifcond, self._genh, self._genc):
> + self._genh.add(gen_visit_members_decl(name))
> + self._genc.add(gen_visit_object_members(name, base,
> + members, variants))
> + # TODO Worth changing the visitor signature, so we could
> + # directly use rather than repeat type.is_implicit()?
> + if not name.startswith('q_'):
> + # only explicit types need an allocating visit
> + self._genh.add(gen_visit_decl(name))
> + self._genc.add(gen_visit_object(name, base, members,
> variants))
>
> def visit_alternate_type(self, name, info, ifcond, variants):
> - self._genh.add(gen_visit_decl(name))
> - self._genc.add(gen_visit_alternate(name, variants))
> + with ifcontext(ifcond, self._genh, self._genc):
> + self._genh.add(gen_visit_decl(name))
> + self._genc.add(gen_visit_alternate(name, variants))
>
>
> def gen_visit(schema, output_dir, prefix, opt_builtins):
The visit part is straightforward: wrap code generation in with
ifcontext().
The type part is more involved. First, it passes ifcond to a bunch of
helpers, which muddies the waters a bit. Second, you can't just wrap
object types generation, because it's recursive. You move the recursion
out of gen_object() (previous patch), so you can wrap that. But you
still can't wrap its new home, gen_variants_objects(). Instead, you
bracket its call of gen_object() with gen_if() ... gen_endif(). Works,
but is there a more direct path to the same result?
I append my attempt. Its basic idea is to wrap code generation right
where it is. Requires passing ifcond to gen_object(). The patch to
visit.py is identical.
Less churn, and I it saves me reviewing the previous patch. Opinions?
>From d6f26abe5a81b10aaff5c75db3bfc60c05203f05 Mon Sep 17 00:00:00 2001
From: Markus Armbruster <address@hidden>
Date: Thu, 21 Jun 2018 18:03:41 +0200
Subject: [PATCH] qapi-types: add #if conditions to types & visitors
Types & visitors are coupled and must be handled together to avoid
temporary build regression.
Wrap generated types/visitor code with #if/#endif using the context
helpers.
Signed-off-by: Markus Armbruster <address@hidden>
---
scripts/qapi/types.py | 48 ++++++++++++++++++++++++++-----------------
scripts/qapi/visit.py | 33 ++++++++++++++++-------------
2 files changed, 48 insertions(+), 33 deletions(-)
diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py
index 298a80db62..e43138bfd7 100644
--- a/scripts/qapi/types.py
+++ b/scripts/qapi/types.py
@@ -55,7 +55,7 @@ def gen_struct_members(members):
return ret
-def gen_object(name, base, members, variants):
+def gen_object(name, ifcond, base, members, variants):
if name in objects_seen:
return ''
objects_seen.add(name)
@@ -64,11 +64,14 @@ def gen_object(name, base, members, variants):
if variants:
for v in variants.variants:
if isinstance(v.type, QAPISchemaObjectType):
- ret += gen_object(v.type.name, v.type.base,
+ ret += gen_object(v.type.name, v.type.ifcond, v.type.base,
v.type.local_members, v.type.variants)
ret += mcgen('''
+''')
+ ret += gen_if(ifcond)
+ ret += mcgen('''
struct %(c_name)s {
''',
c_name=c_name(name))
@@ -101,6 +104,7 @@ struct %(c_name)s {
ret += mcgen('''
};
''')
+ ret += gen_endif(ifcond)
return ret
@@ -207,33 +211,39 @@ class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor):
self._genc.add(gen_type_cleanup(name))
def visit_enum_type(self, name, info, ifcond, values, prefix):
- self._genh.preamble_add(gen_enum(name, values, prefix))
- self._genc.add(gen_enum_lookup(name, values, prefix))
+ with ifcontext(ifcond, self._genh, self._genc):
+ 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, ifcond, element_type):
- self._genh.preamble_add(gen_fwd_object_or_array(name))
- self._genh.add(gen_array(name, element_type))
- self._gen_type_cleanup(name)
+ with ifcontext(ifcond, self._genh, self._genc):
+ 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, ifcond, base, members, variants):
# Nothing to do for the special empty builtin
if name == 'q_empty':
return
- self._genh.preamble_add(gen_fwd_object_or_array(name))
- self._genh.add(gen_object(name, base, members, variants))
- if base and not base.is_implicit():
- self._genh.add(gen_upcast(name, base))
- # TODO Worth changing the visitor signature, so we could
- # directly use rather than repeat type.is_implicit()?
- if not name.startswith('q_'):
- # implicit types won't be directly allocated/freed
- self._gen_type_cleanup(name)
+ with ifcontext(ifcond, self._genh):
+ self._genh.preamble_add(gen_fwd_object_or_array(name))
+ self._genh.add(gen_object(name, ifcond, base, members, variants))
+ with ifcontext(ifcond, self._genh, self._genc):
+ if base and not base.is_implicit():
+ self._genh.add(gen_upcast(name, base))
+ # TODO Worth changing the visitor signature, so we could
+ # directly use rather than repeat type.is_implicit()?
+ if not name.startswith('q_'):
+ # implicit types won't be directly allocated/freed
+ self._gen_type_cleanup(name)
def visit_alternate_type(self, name, info, ifcond, variants):
- self._genh.preamble_add(gen_fwd_object_or_array(name))
- self._genh.add(gen_object(name, None,
+ with ifcontext(ifcond, self._genh):
+ self._genh.preamble_add(gen_fwd_object_or_array(name))
+ self._genh.add(gen_object(name, ifcond, None,
[variants.tag_member], variants))
- self._gen_type_cleanup(name)
+ with ifcontext(ifcond, self._genh, self._genc):
+ self._gen_type_cleanup(name)
def gen_types(schema, output_dir, prefix, opt_builtins):
diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index 9ea2e04f81..e4a62ce030 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -302,29 +302,34 @@ class
QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
types=types))
def visit_enum_type(self, name, info, ifcond, values, prefix):
- self._genh.add(gen_visit_decl(name, scalar=True))
- self._genc.add(gen_visit_enum(name))
+ with ifcontext(ifcond, self._genh, self._genc):
+ self._genh.add(gen_visit_decl(name, scalar=True))
+ self._genc.add(gen_visit_enum(name))
def visit_array_type(self, name, info, ifcond, element_type):
- self._genh.add(gen_visit_decl(name))
- self._genc.add(gen_visit_list(name, element_type))
+ with ifcontext(ifcond, self._genh, self._genc):
+ self._genh.add(gen_visit_decl(name))
+ self._genc.add(gen_visit_list(name, element_type))
def visit_object_type(self, name, info, ifcond, base, members, variants):
# Nothing to do for the special empty builtin
if name == 'q_empty':
return
- self._genh.add(gen_visit_members_decl(name))
- self._genc.add(gen_visit_object_members(name, base, members, variants))
- # TODO Worth changing the visitor signature, so we could
- # directly use rather than repeat type.is_implicit()?
- if not name.startswith('q_'):
- # only explicit types need an allocating visit
- self._genh.add(gen_visit_decl(name))
- self._genc.add(gen_visit_object(name, base, members, variants))
+ with ifcontext(ifcond, self._genh, self._genc):
+ self._genh.add(gen_visit_members_decl(name))
+ self._genc.add(gen_visit_object_members(name, base,
+ members, variants))
+ # TODO Worth changing the visitor signature, so we could
+ # directly use rather than repeat type.is_implicit()?
+ if not name.startswith('q_'):
+ # only explicit types need an allocating visit
+ self._genh.add(gen_visit_decl(name))
+ self._genc.add(gen_visit_object(name, base, members, variants))
def visit_alternate_type(self, name, info, ifcond, variants):
- self._genh.add(gen_visit_decl(name))
- self._genc.add(gen_visit_alternate(name, variants))
+ with ifcontext(ifcond, self._genh, self._genc):
+ self._genh.add(gen_visit_decl(name))
+ self._genc.add(gen_visit_alternate(name, variants))
def gen_visit(schema, output_dir, prefix, opt_builtins):
--
2.17.1
- Re: [Qemu-devel] [PATCH v3 14/49] qapi-types: add #if conditions to types & visitors,
Markus Armbruster <=