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Re: [Qemu-devel] [PATCH 1/2] blockdev: Add dynamic generation of module_
From: |
Colin Lord |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] blockdev: Add dynamic generation of module_block.h |
Date: |
Thu, 16 Jun 2016 09:57:20 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 |
On 06/16/2016 12:59 AM, Fam Zheng wrote:
> On Wed, 06/15 14:40, Colin Lord wrote:
>> From: Marc Mari <address@hidden>
>>
>> To simplify the addition of new block modules, add a script that generates
>> include/qemu/module_block.h automatically from the modules' source code.
>>
>> This script assumes that the QEMU coding style rules are followed.
>>
>> Signed-off-by: Marc MarĂ <address@hidden>
>> Signed-off-by: Colin Lord <address@hidden>
>> ---
>> .gitignore | 1 +
>> Makefile | 8 +++
>> scripts/modules/module_block.py | 134
>> ++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 143 insertions(+)
>> create mode 100644 scripts/modules/module_block.py
>>
>> diff --git a/.gitignore b/.gitignore
>> index 38ee1c5..06aa064 100644
>> --- a/.gitignore
>> +++ b/.gitignore
>> @@ -110,3 +110,4 @@ tags
>> TAGS
>> docker-src.*
>> *~
>> +/include/qemu/module_block.h
>> diff --git a/Makefile b/Makefile
>> index ed4032a..8f8b6a2 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -76,6 +76,8 @@ GENERATED_HEADERS += trace/generated-ust-provider.h
>> GENERATED_SOURCES += trace/generated-ust.c
>> endif
>>
>> +GENERATED_HEADERS += include/qemu/module_block.h
>> +
>> # Don't try to regenerate Makefile or configure
>> # We don't generate any of them
>> Makefile: ;
>> @@ -352,6 +354,12 @@ ivshmem-client$(EXESUF): $(ivshmem-client-obj-y)
>> libqemuutil.a libqemustub.a
>> ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) libqemuutil.a libqemustub.a
>> $(call LINK, $^)
>>
>> +include/qemu/module_block.h: $(SRC_PATH)/scripts/modules/module_block.py
>> config-host.mak
>> + $(call quiet-command,$(PYTHON) \
>> +$(SRC_PATH)/scripts/modules/module_block.py \
>> + $(SRC_PATH)/"./include/qemu/" $(addprefix $(SRC_PATH)/,$(patsubst
>> %.mo,%.c,$(block-obj-m))), \
>> + " GEN $@")
>> +
>> clean:
>> # avoid old build problems by removing potentially incorrect old files
>> rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h
>> gen-op-arm.h
>> diff --git a/scripts/modules/module_block.py
>> b/scripts/modules/module_block.py
>> new file mode 100644
>> index 0000000..005bc49
>> --- /dev/null
>> +++ b/scripts/modules/module_block.py
>> @@ -0,0 +1,134 @@
>> +#!/usr/bin/python
>> +#
>> +# Module information generator
>> +#
>> +# Copyright Red Hat, Inc. 2015
>> +#
>> +# Authors:
>> +# Marc Mari <address@hidden>
>
> Address hidden seems like a mistake during copy from web. :)
>
> One more below..
>
Yep, I didn't have the original emails (only the web archives) and I
didn't realize it wasn't supposed to look like that until I sent it out.
I'll fix it for the next version.
>> +#
>> +# This work is licensed under the terms of the GNU GPL, version 2.
>> +# See the COPYING file in the top-level directory.
>> +
>> +from __future__ import print_function
>> +import sys
>> +import os
>> +
>> +def get_string_struct(line):
>> + data = line.split()
>> +
>> + # data[0] -> struct element name
>> + # data[1] -> =
>> + # data[2] -> value
>> +
>> + return data[2].replace('"', '')[:-1]
>> +
>> +def add_module(fhader, library, format_name, protocol_name,
>> + probe, probe_device):
>> + lines = []
>> + lines.append('.library_name = "' + library + '",')
>> + if format_name != "":
>> + lines.append('.format_name = "' + format_name + '",')
>> + if protocol_name != "":
>> + lines.append('.protocol_name = "' + protocol_name + '",')
>> + if probe:
>> + lines.append('.has_probe = true,')
>> + if probe_device:
>> + lines.append('.has_probe_device = true,')
>> +
>> + text = '\n\t'.join(lines)
>> + fheader.write('\n\t{\n\t' + text + '\n\t},')
>> +
>> +def process_file(fheader, filename):
>> + # This parser assumes the coding style rules are being followed
>> + with open(filename, "r") as cfile:
>> + found_something = False
>> + found_start = False
>> + library, _ = os.path.splitext(os.path.basename(filename))
>> + for line in cfile:
>> + if found_start:
>> + line = line.replace('\n', '')
>> + if line.find(".format_name") != -1:
>> + format_name = get_string_struct(line)
>> + elif line.find(".protocol_name") != -1:
>> + protocol_name = get_string_struct(line)
>> + elif line.find(".bdrv_probe") != -1:
>> + probe = True
>> + elif line.find(".bdrv_probe_device") != -1:
>> + probe_device = True
>> + elif line == "};":
>> + add_module(fheader, library, format_name, protocol_name,
>> + probe, probe_device)
>> + found_start = False
>> + elif line.find("static BlockDriver") != -1:
>> + found_something = True
>> + found_start = True
>> + format_name = ""
>> + protocol_name = ""
>> + probe = False
>> + probe_device = False
>> +
>> + if not found_something:
>> + print("No BlockDriver struct found in " + filename + ". \
>> + Is this really a module?", file=sys.stderr)
>> + sys.exit(1)
>> +
>> +def print_top(fheader):
>> + fheader.write('''/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
>> +/*
>> + * QEMU Block Module Infrastructure
>> + *
>> + * Copyright Red Hat, Inc. 2015
>> + *
>> + * Authors:
>> + * Marc Mari <address@hidden>
>
> Here!
>
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2. See
>> + * the COPYING file in the top-level directory.
>> + *
>> + */
>> +
>> +''')
>> +
>> + fheader.write('''#ifndef QEMU_MODULE_BLOCK_H
>> +#define QEMU_MODULE_BLOCK_H
>> +
>> +#include "qemu-common.h"
>> +
>> +static const struct {
>> + const char *format_name;
>> + const char *protocol_name;
>> + const char *library_name;
>> + bool has_probe;
>> + bool has_probe_device;
>> +} block_driver_modules[] = {''')
>> +
>> +def print_bottom(fheader):
>> + fheader.write('''
>> +};
>> +
>> +#endif
>> +''')
>> +
>> +# First argument: output folder
>> +# All other arguments: modules source files (.c)
>> +output_dir = sys.argv[1]
>> +if not os.path.isdir(output_dir):
>> + print("Folder " + output_dir + " does not exist", file=sys.stderr)
>> + sys.exit(1)
>> +
>> +path = output_dir + 'module_block.h'
>> +
>> +with open(path, 'w') as fheader:
>> + print_top(fheader)
>> +
>> + for filename in sys.argv[2:]:
>> + if os.path.isfile(filename):
>> + process_file(fheader, filename)
>> + else:
>> + print("File " + filename + " does not exist.", file=sys.stderr)
>> + sys.exit(1)
>> +
>> + print_bottom(fheader)
>> +
>> +sys.exit(0)
>> --
>> 2.5.5
>>
>>
>
Colin
Re: [Qemu-devel] [Qemu-block] [PATCH 0/2] Dynamic module loading for block drivers, Stefan Hajnoczi, 2016/06/17