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Thu, 5 Nov 2020 12:29:29 +0000 (UTC) Received: from localhost (unknown [10.36.110.27]) by smtp.corp.redhat.com (Postfix) with ESMTP id 82BE7614F5; Thu, 5 Nov 2020 12:29:21 +0000 (UTC) From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Subject: [PATCH v2 3/9] qapi: start building an 'if' predicate tree Date: Thu, 5 Nov 2020 16:28:02 +0400 Message-Id: <20201105122808.1182973-4-marcandre.lureau@redhat.com> In-Reply-To: <20201105122808.1182973-1-marcandre.lureau@redhat.com> References: <20201105122808.1182973-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=marcandre.lureau@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=marcandre.lureau@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/05 01:14:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Michael Roth , Juan Quintela , Markus Armbruster , "Dr. David Alan Gilbert" , Gerd Hoffmann , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , jsnow@redhat.com, Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Marc-André Lureau The following patches are going to express conditions in a target language agnostic way. For that, let's start building a predicate tree of configuration options. This intermediary steps still uses C-preprocessor expressions as predicates: "if: [STR, ..]" is translated to a "IfCond -> IfAll -> IfOption[STR]" tree, which will generate "#if STR && .." C code. After the necessary condition tree nodes are introduced, the 'if' C expressions will be converted. (the tree will be less expressive than the full C macros expressions, and will be based only on identifiers. It will only support these operations over the configuration identifiers: 'all', 'any' and 'not') For now, the documentation will continue to use a C condition expression (with defined(FOO), &&, || etc). Eventually, we may want to generate a more human friendly syntax later. Signed-off-by: Marc-André Lureau --- docs/sphinx/qapidoc.py | 6 +-- scripts/qapi/common.py | 42 ++++++++++++++++++- scripts/qapi/schema.py | 47 +++++++++++---------- tests/qapi-schema/doc-good.out | 12 +++--- tests/qapi-schema/qapi-schema-test.out | 58 +++++++++++++------------- 5 files changed, 104 insertions(+), 61 deletions(-) diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py index db9520f37f..31b47e4745 100644 --- a/docs/sphinx/qapidoc.py +++ b/docs/sphinx/qapidoc.py @@ -112,12 +112,10 @@ class QAPISchemaGenRSTVisitor(QAPISchemaVisitor): def _nodes_for_ifcond(self, ifcond, with_if=True): """Return list of Text, literal nodes for the ifcond - Return a list which gives text like ' (If: cond1, cond2, cond3)', where - the conditions are in literal-text and the commas are not. + Return a list which gives text like ' (If: C-condition)'. If with_if is False, we don't return the "(If: " and ")". """ - condlist = intersperse([nodes.literal('', c) for c in ifcond.ifcond], - nodes.Text(', ')) + condlist = [nodes.literal('', ifcond.gen_if())] if not with_if: return condlist diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py index 6ee72956b5..01c4c0c878 100644 --- a/scripts/qapi/common.py +++ b/scripts/qapi/common.py @@ -12,7 +12,7 @@ # See the COPYING file in the top-level directory. import re -from typing import Optional +from typing import Optional, Sequence #: Magic string that gets removed along with all space to its right. @@ -192,3 +192,43 @@ def guardend(name: str) -> str: #endif /* %(name)s */ ''', name=c_fname(name).upper()) + + +class IfPredicate: + def cgen(self) -> str: + raise NotImplementedError() + + +class IfOption(IfPredicate): + def __init__(self, option: str): + self.option = option + + def cgen(self) -> str: + return self.option + + def __repr__(self) -> str: + return repr(self.option) + + def __eq__(self, other: object) -> bool: + if not isinstance(other, IfOption): + return False + return self.option == other.option + + +class IfAll(IfPredicate): + def __init__(self, pred_list: Sequence[IfPredicate]): + self.pred_list = pred_list + + def cgen(self) -> str: + return " && ".join([p.cgen() for p in self.pred_list]) + + def __bool__(self) -> bool: + return bool(self.pred_list) + + def __repr__(self) -> str: + return f"IfAll({self.pred_list})" + + def __eq__(self, other: object) -> bool: + if not isinstance(other, IfAll): + return False + return self.pred_list == other.pred_list diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py index 92961aedcf..4a4dbf2da7 100644 --- a/scripts/qapi/schema.py +++ b/scripts/qapi/schema.py @@ -70,7 +70,13 @@ from typing import ( overload, ) -from .common import POINTER_SUFFIX, c_name, mcgen +from .common import ( + POINTER_SUFFIX, + IfAll, + IfOption, + c_name, + mcgen, +) from .error import QAPISemError, QAPISourceError from .expr import check_exprs from .parser import ParsedExpression, QAPIDoc, QAPISchemaParser @@ -87,34 +93,33 @@ class Visitable: class QAPISchemaIf: def __init__(self, ifcond: Optional[Sequence[str]] = None): - self.ifcond = ifcond or [] - - def gen_if(self) -> str: - ret = '' - for ifc in self.ifcond: - ret += mcgen(''' -#if %(cond)s -''', cond=ifc) - return ret - - def gen_endif(self) -> str: - ret = '' - for ifc in reversed(self.ifcond): - ret += mcgen(''' -#endif /* %(cond)s */ -''', cond=ifc) - return ret + pred_list = [IfOption(opt) for opt in ifcond or []] + self.pred = IfAll(pred_list) def __bool__(self) -> bool: - return bool(self.ifcond) + return bool(self.pred) def __repr__(self) -> str: - return repr(self.ifcond) + return repr(self.pred) def __eq__(self, other: object) -> bool: if not isinstance(other, QAPISchemaIf): return NotImplemented - return self.ifcond == other.ifcond + return self.pred == other.pred + + def gen_if(self) -> str: + if self.pred: + return mcgen(''' +#if %(cond)s +''', cond=self.pred.cgen()) + return "" + + def gen_endif(self) -> str: + if self.pred: + return mcgen(''' +#endif // %(cond)s +''', cond=self.pred.cgen()) + return "" class QAPISchemaEntity(Visitable): diff --git a/tests/qapi-schema/doc-good.out b/tests/qapi-schema/doc-good.out index 419284dae2..0d27323c47 100644 --- a/tests/qapi-schema/doc-good.out +++ b/tests/qapi-schema/doc-good.out @@ -12,15 +12,15 @@ enum QType module doc-good.json enum Enum member one - if ['defined(IFONE)'] + if IfAll(['defined(IFONE)']) member two - if ['defined(IFCOND)'] + if IfAll(['defined(IFCOND)']) feature enum-feat object Base member base1: Enum optional=False object Variant1 member var1: str optional=False - if ['defined(IFSTR)'] + if IfAll(['defined(IFSTR)']) feature member-feat feature variant1-feat object Variant2 @@ -29,7 +29,7 @@ object Object tag base1 case one: Variant1 case two: Variant2 - if ['IFTWO'] + if IfAll(['IFTWO']) feature union-feat1 object q_obj_Variant1-wrapper member data: Variant1 optional=False @@ -38,13 +38,13 @@ object q_obj_Variant2-wrapper enum SugaredUnionKind member one member two - if ['IFTWO'] + if IfAll(['IFTWO']) object SugaredUnion member type: SugaredUnionKind optional=False tag type case one: q_obj_Variant1-wrapper case two: q_obj_Variant2-wrapper - if ['IFTWO'] + if IfAll(['IFTWO']) feature union-feat2 alternate Alternate tag type diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out index 8868ca0dca..8ba658cd38 100644 --- a/tests/qapi-schema/qapi-schema-test.out +++ b/tests/qapi-schema/qapi-schema-test.out @@ -298,65 +298,65 @@ command __org.qemu_x-command q_obj___org.qemu_x-command-arg -> __org.qemu_x-Unio object TestIfStruct member foo: int optional=False member bar: int optional=False - if ['defined(TEST_IF_STRUCT_BAR)'] - if ['defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_STRUCT_BAR)']) + if IfAll(['defined(TEST_IF_STRUCT)']) enum TestIfEnum member foo member bar - if ['defined(TEST_IF_ENUM_BAR)'] - if ['defined(TEST_IF_ENUM)'] + if IfAll(['defined(TEST_IF_ENUM_BAR)']) + if IfAll(['defined(TEST_IF_ENUM)']) object q_obj_TestStruct-wrapper member data: TestStruct optional=False enum TestIfUnionKind member foo member union_bar - if ['defined(TEST_IF_UNION_BAR)'] - if ['defined(TEST_IF_UNION) && defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_UNION_BAR)']) + if IfAll(['defined(TEST_IF_UNION) && defined(TEST_IF_STRUCT)']) object TestIfUnion member type: TestIfUnionKind optional=False tag type case foo: q_obj_TestStruct-wrapper case union_bar: q_obj_str-wrapper - if ['defined(TEST_IF_UNION_BAR)'] - if ['defined(TEST_IF_UNION) && defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_UNION_BAR)']) + if IfAll(['defined(TEST_IF_UNION) && defined(TEST_IF_STRUCT)']) object q_obj_TestIfUnionCmd-arg member union_cmd_arg: TestIfUnion optional=False - if ['defined(TEST_IF_UNION)'] + if IfAll(['defined(TEST_IF_UNION)']) command TestIfUnionCmd q_obj_TestIfUnionCmd-arg -> None gen=True success_response=True boxed=False oob=False preconfig=False - if ['defined(TEST_IF_UNION)'] + if IfAll(['defined(TEST_IF_UNION)']) alternate TestIfAlternate tag type case foo: int case bar: TestStruct - if ['defined(TEST_IF_ALT_BAR)'] - if ['defined(TEST_IF_ALT) && defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_ALT_BAR)']) + if IfAll(['defined(TEST_IF_ALT) && defined(TEST_IF_STRUCT)']) object q_obj_TestIfAlternateCmd-arg member alt_cmd_arg: TestIfAlternate optional=False - if ['defined(TEST_IF_ALT)'] + if IfAll(['defined(TEST_IF_ALT)']) command TestIfAlternateCmd q_obj_TestIfAlternateCmd-arg -> None gen=True success_response=True boxed=False oob=False preconfig=False - if ['defined(TEST_IF_ALT)'] + if IfAll(['defined(TEST_IF_ALT)']) object q_obj_TestIfCmd-arg member foo: TestIfStruct optional=False member bar: TestIfEnum optional=False - if ['defined(TEST_IF_CMD_BAR)'] - if ['defined(TEST_IF_CMD)', 'defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_CMD_BAR)']) + if IfAll(['defined(TEST_IF_CMD)', 'defined(TEST_IF_STRUCT)']) command TestIfCmd q_obj_TestIfCmd-arg -> UserDefThree gen=True success_response=True boxed=False oob=False preconfig=False - if ['defined(TEST_IF_CMD)', 'defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_CMD)', 'defined(TEST_IF_STRUCT)']) command TestCmdReturnDefThree None -> UserDefThree gen=True success_response=True boxed=False oob=False preconfig=False array TestIfEnumList TestIfEnum - if ['defined(TEST_IF_ENUM)'] + if IfAll(['defined(TEST_IF_ENUM)']) object q_obj_TestIfEvent-arg member foo: TestIfStruct optional=False member bar: TestIfEnumList optional=False - if ['defined(TEST_IF_EVT_BAR)'] - if ['defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_EVT_BAR)']) + if IfAll(['defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)']) event TestIfEvent q_obj_TestIfEvent-arg boxed=False - if ['defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)'] + if IfAll(['defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)']) object FeatureStruct0 member foo: int optional=False object FeatureStruct1 @@ -379,17 +379,17 @@ object FeatureStruct4 object CondFeatureStruct1 member foo: int optional=False feature feature1 - if ['defined(TEST_IF_FEATURE_1)'] + if IfAll(['defined(TEST_IF_FEATURE_1)']) object CondFeatureStruct2 member foo: int optional=False feature feature1 - if ['defined(TEST_IF_FEATURE_1)'] + if IfAll(['defined(TEST_IF_FEATURE_1)']) feature feature2 - if ['defined(TEST_IF_FEATURE_2)'] + if IfAll(['defined(TEST_IF_FEATURE_2)']) object CondFeatureStruct3 member foo: int optional=False feature feature1 - if ['defined(TEST_IF_COND_1)', 'defined(TEST_IF_COND_2)'] + if IfAll(['defined(TEST_IF_COND_1)', 'defined(TEST_IF_COND_2)']) enum FeatureEnum1 member eins member zwei @@ -429,17 +429,17 @@ command test-command-features3 None -> None command test-command-cond-features1 None -> None gen=True success_response=True boxed=False oob=False preconfig=False feature feature1 - if ['defined(TEST_IF_FEATURE_1)'] + if IfAll(['defined(TEST_IF_FEATURE_1)']) command test-command-cond-features2 None -> None gen=True success_response=True boxed=False oob=False preconfig=False feature feature1 - if ['defined(TEST_IF_FEATURE_1)'] + if IfAll(['defined(TEST_IF_FEATURE_1)']) feature feature2 - if ['defined(TEST_IF_FEATURE_2)'] + if IfAll(['defined(TEST_IF_FEATURE_2)']) command test-command-cond-features3 None -> None gen=True success_response=True boxed=False oob=False preconfig=False feature feature1 - if ['defined(TEST_IF_COND_1)', 'defined(TEST_IF_COND_2)'] + if IfAll(['defined(TEST_IF_COND_1)', 'defined(TEST_IF_COND_2)']) event TEST-EVENT-FEATURES1 None boxed=False feature deprecated