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Wed, 10 Jun 2020 10:04:00 +0000 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Subject: [PATCH v7 4/7] scripts: add coroutine-wrapper.py Date: Wed, 10 Jun 2020 13:03:33 +0300 Message-Id: <20200610100336.23451-5-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200610100336.23451-1-vsementsov@virtuozzo.com> References: <20200610100336.23451-1-vsementsov@virtuozzo.com> X-ClientProxiedBy: AM0PR03CA0005.eurprd03.prod.outlook.com (2603:10a6:208:14::18) To AM7PR08MB5494.eurprd08.prod.outlook.com (2603:10a6:20b:dc::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (185.215.60.166) by AM0PR03CA0005.eurprd03.prod.outlook.com (2603:10a6:208:14::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3088.19 via Frontend Transport; Wed, 10 Jun 2020 10:03:59 +0000 X-Mailer: git-send-email 2.21.0 X-Originating-IP: [185.215.60.166] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 36cb3ada-c893-446e-1ea8-08d80d259899 X-MS-TrafficTypeDiagnostic: AM7PR08MB5525: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:651; 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envelope-from=vsementsov@virtuozzo.com; helo=EUR01-HE1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/10 06:04:01 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: fam@euphon.net, kwolf@redhat.com, vsementsov@virtuozzo.com, ehabkost@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, crosa@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" We have a very frequent pattern of creating coroutine from function with several arguments: - create structure to pack parameters - create _entry function to call original function taking parameters from struct - do different magic to handle completion: set ret to NOT_DONE or EINPROGRESS or use separate bool field - fill the struct and create coroutine from _entry function and this struct as a parameter - do coroutine enter and BDRV_POLL_WHILE loop Let's reduce code duplication by generating coroutine wrappers. This patch adds scripts/coroutine-wrapper.py together with some friends, which will generate functions with declared prototypes marked by 'generated_co_wrapper' specifier. The usage of new code generation is as follows: 1. define somewhere int coroutine_fn bdrv_co_NAME(...) {...} function 2. declare in some header file int generated_co_wrapper bdrv_NAME(...); function with same list of parameters. (you'll need to include "block/generated-co-wrapper.h" to get the specifier) 3. both declarations should be available through block/coroutines.h header. 4. add header with generated_co_wrapper declaration into COROUTINE_HEADERS list in Makefile Still, no function is now marked, this work is for the following commit. Signed-off-by: Vladimir Sementsov-Ogievskiy --- Makefile | 8 ++ block/block-gen.h | 49 ++++++++++ include/block/block.h | 7 ++ block/Makefile.objs | 1 + scripts/coroutine-wrapper.py | 180 +++++++++++++++++++++++++++++++++++ 5 files changed, 245 insertions(+) create mode 100644 block/block-gen.h create mode 100755 scripts/coroutine-wrapper.py diff --git a/Makefile b/Makefile index d1af126ea1..517a29810f 100644 --- a/Makefile +++ b/Makefile @@ -175,6 +175,14 @@ generated-files-y += $(TRACE_SOURCES) generated-files-y += $(BUILD_DIR)/trace-events-all generated-files-y += .git-submodule-status +generated-files-y += block/block-gen.c + +COROUTINE_HEADERS = include/block/block.h block/coroutines.h +block/block-gen.c: $(COROUTINE_HEADERS) scripts/coroutine-wrapper.py + $(call quiet-command, \ + cat $(addprefix $(SRC_PATH)/,$(COROUTINE_HEADERS)) | \ + $(SRC_PATH)/scripts/coroutine-wrapper.py > $@,"GEN","$(TARGET_DIR)$@") + trace-group-name = $(shell dirname $1 | sed -e 's/[^a-zA-Z0-9]/_/g') tracetool-y = $(SRC_PATH)/scripts/tracetool.py diff --git a/block/block-gen.h b/block/block-gen.h new file mode 100644 index 0000000000..f80cf4897d --- /dev/null +++ b/block/block-gen.h @@ -0,0 +1,49 @@ +/* + * Block coroutine wrapping core, used by auto-generated block/block-gen.c + * + * Copyright (c) 2003 Fabrice Bellard + * Copyright (c) 2020 Virtuozzo International GmbH + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#ifndef BLOCK_BLOCK_GEN_H +#define BLOCK_BLOCK_GEN_H + +#include "block/block_int.h" + +/* Base structure for argument packing structures */ +typedef struct BdrvPollCo { + BlockDriverState *bs; + bool in_progress; + int ret; + Coroutine *co; /* Keep pointer here for debugging */ +} BdrvPollCo; + +static inline int bdrv_poll_co(BdrvPollCo *s) +{ + assert(!qemu_in_coroutine()); + + bdrv_coroutine_enter(s->bs, s->co); + BDRV_POLL_WHILE(s->bs, s->in_progress); + + return s->ret; +} + +#endif /* BLOCK_BLOCK_GEN_H */ diff --git a/include/block/block.h b/include/block/block.h index 46965a7780..59a002e06f 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -10,6 +10,13 @@ #include "block/blockjob.h" #include "qemu/hbitmap.h" +/* + * generated_co_wrapper + * Function specifier, which does nothing but marking functions to be + * generated by scripts/coroutine-wrapper.py + */ +#define generated_co_wrapper + /* block.c */ typedef struct BlockDriver BlockDriver; typedef struct BdrvChild BdrvChild; diff --git a/block/Makefile.objs b/block/Makefile.objs index 3635b6b4c1..05e4d033c1 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -45,6 +45,7 @@ block-obj-y += crypto.o block-obj-y += aio_task.o block-obj-y += backup-top.o block-obj-y += filter-compress.o +block-obj-y += block-gen.o common-obj-y += monitor/ block-obj-y += stream.o diff --git a/scripts/coroutine-wrapper.py b/scripts/coroutine-wrapper.py new file mode 100755 index 0000000000..57ae6aed20 --- /dev/null +++ b/scripts/coroutine-wrapper.py @@ -0,0 +1,180 @@ +#!/usr/bin/env python3 +"""Generate coroutine wrappers for block subsystem. + +The program parses one or several concatenated c files from stdin, +searches for functions with 'generated_co_wrapper' specifier +and generates corresponding wrappers on stdout. + +Usage: cat FILE.[ch]... | coroutine-wrapper.py > generated-file.c + +Copyright (c) 2020 Virtuozzo International GmbH. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +""" + +import sys +import re +import subprocess +import json +from typing import Iterator + + +def prettify(code: str) -> str: + """Prettify code using clang-format if available""" + + try: + style = json.dumps({ + 'IndentWidth': 4, + 'BraceWrapping': {'AfterFunction': True}, + 'BreakBeforeBraces': 'Custom', + 'SortIncludes': False, + 'MaxEmptyLinesToKeep': 2 + }) + p = subprocess.run(['clang-format', f'-style={style}'], check=True, + encoding='utf-8', input=code, + stdout=subprocess.PIPE) + return p.stdout + except FileNotFoundError: + return code + + +def gen_header(): + copyright = re.sub('^.*Copyright', 'Copyright', __doc__, flags=re.DOTALL) + copyright = re.sub('^(?=.)', ' * ', copyright.strip(), flags=re.MULTILINE) + copyright = re.sub('^$', ' *', copyright, flags=re.MULTILINE) + return f"""\ +/* + * File is generated by scripts/coroutine-wrapper.py + * +{copyright} + */ + +#include "qemu/osdep.h" +#include "block/coroutines.h" +#include "block/block-gen.h" +#include "block/block_int.h"\ +""" + + +class ParamDecl: + param_re = re.compile(r'(?P' + r'(?P.*[ *])' + r'(?P[a-z][a-z0-9_]*)' + r')') + + def __init__(self, param_decl: str) -> None: + m = self.param_re.match(param_decl.strip()) + if m is None: + raise ValueError(f'Wrong parameter declaration: "{param_decl}"') + self.decl = m.group('decl') + self.type = m.group('type') + self.name = m.group('name') + + +class FuncDecl: + def __init__(self, return_type: str, name: str, args: str) -> None: + self.return_type = return_type.strip() + self.name = name.strip() + self.args = [ParamDecl(arg.strip()) for arg in args.split(',')] + + def gen_list(self, format: str) -> str: + return ', '.join(format.format_map(arg.__dict__) for arg in self.args) + + def gen_block(self, format: str) -> str: + return '\n'.join(format.format_map(arg.__dict__) for arg in self.args) + + +# Match wrappers declared with a generated_co_wrapper mark +func_decl_re = re.compile(r'^int\s*generated_co_wrapper\s*' + r'(?P[a-z][a-z0-9_]*)' + r'\((?P[^)]*)\);$', re.MULTILINE) + + +def func_decl_iter(text: str) -> Iterator: + for m in func_decl_re.finditer(text): + yield FuncDecl(return_type='int', + name=m.group('wrapper_name'), + args=m.group('args')) + + +def snake_to_camel(func_name: str) -> str: + """ + Convert underscore names like 'some_function_name' to camel-case like + 'SomeFunctionName' + """ + words = func_name.split('_') + words = [w[0].upper() + w[1:] for w in words] + return ''.join(words) + + +def gen_wrapper(func: FuncDecl) -> str: + assert func.name.startswith('bdrv_') + assert not func.name.startswith('bdrv_co_') + assert func.return_type == 'int' + assert func.args[0].type in ['BlockDriverState *', 'BdrvChild *'] + + name = 'bdrv_co_' + func.name[5:] + bs = 'bs' if func.args[0].type == 'BlockDriverState *' else 'child->bs' + struct_name = snake_to_camel(name) + + return f"""\ +/* + * Wrappers for {name} + */ + +typedef struct {struct_name} {{ + BdrvPollCo poll_state; +{ func.gen_block(' {decl};') } +}} {struct_name}; + +static void coroutine_fn {name}_entry(void *opaque) +{{ + {struct_name} *s = opaque; + + s->poll_state.ret = {name}({ func.gen_list('s->{name}') }); + s->poll_state.in_progress = false; + + aio_wait_kick(); +}} + +int {func.name}({ func.gen_list('{decl}') }) +{{ + if (qemu_in_coroutine()) {{ + return {name}({ func.gen_list('{name}') }); + }} else {{ + {struct_name} s = {{ + .poll_state.bs = {bs}, + .poll_state.in_progress = true, + +{ func.gen_block(' .{name} = {name},') } + }}; + + s.poll_state.co = qemu_coroutine_create({name}_entry, &s); + + return bdrv_poll_co(&s.poll_state); + }} +}}""" + + +def gen_wrappers_file(input_code: str) -> str: + res = gen_header() + for func in func_decl_iter(input_code): + res += '\n\n\n' + res += gen_wrapper(func) + + return prettify(res) # prettify to wrap long lines + + +if __name__ == '__main__': + print(gen_wrappers_file(sys.stdin.read()))