Re: [Qemu-devel] [PATCH] RFC: options parse in vl.c should be moduled

[Wanpeng Li <liwp@linux.vnet.ibm.com>]

On Fri, Mar 30, 2012 at 01:53:14PM +0100, Daniel P. Berrange wrote:
>On Fri, Mar 30, 2012 at 08:36:43PM +0800, Wanpeng Li wrote:
>> Consider of the options parse process in main function of vl.c is too
>> long.It should be module into single function to clear ideas, strengthen
>> the source code management, and increase code readability.So I module the 
>> process of options parse as function options_parse, and expose some variables
>> in order to not influence command-line invocations.
>> 
>> Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com>
>> ---
>>  vl.c |  159 ++++++++++++++++++++++++++++++++++-------------------------------
>>  1 files changed, 83 insertions(+), 76 deletions(-)
>> 
>> diff --git a/vl.c b/vl.c
>> index 0fccf50..fa4d0a9 100644
>> --- a/vl.c
>> +++ b/vl.c
>> @@ -2251,84 +2251,40 @@ int qemu_init_main_loop(void)
>>      return main_loop_init();
>>  }
>>  
>> -int main(int argc, char **argv, char **envp)
>> -{
>> -    int i;
>> -    int snapshot, linux_boot;
>> -    const char *icount_option = NULL;
>> -    const char *initrd_filename;
>> -    const char *kernel_filename, *kernel_cmdline;
>> -    char boot_devices[33] = "cad"; /* default to HD->floppy->CD-ROM */
>> -    DisplayState *ds;
>> -    DisplayChangeListener *dcl;
>> -    int cyls, heads, secs, translation;
>> -    QemuOpts *hda_opts = NULL, *opts, *machine_opts;
>> -    QemuOptsList *olist;
>> -    int optind;
>> -    const char *optarg;
>> -    const char *loadvm = NULL;
>> -    QEMUMachine *machine;
>> -    const char *cpu_model;
>> -    const char *vga_model = NULL;
>> -    const char *pid_file = NULL;
>> -    const char *incoming = NULL;
>> +int snapshot, linux_boot;
>> +const char *icount_option;
>> +const char *initrd_filename;
>> +const char *kernel_filename, *kernel_cmdline;
>> +char boot_devices[33] = "cad"; /* default to HD->floppy->CD-ROM */
>> +DisplayState *ds;
>> +DisplayChangeListener *dcl;
>> +int cyls, heads, secs, translation;
>> +QemuOpts *hda_opts , *opts, *machine_opts;
>> +QemuOptsList *olist;
>> +int optind;
>> +const char *loadvm;
>> +QEMUMachine *machine;
>> +const char *cpu_model;
>> +const char *vga_model;
>> +const char *pid_file;
>> +const char *incoming;
>>  #ifdef CONFIG_VNC
>> -    int show_vnc_port = 0;
>> +int show_vnc_port;
>
>[snip]
>
>> +int defconfig = 1;
>> +const char *log_mask;
>> +const char *log_file;
>> +GMemVTable mem_trace = {
>> +    .malloc = malloc_and_trace,
>> +    .realloc = realloc_and_trace,
>> +    .free = free_and_trace,
>> +};
>> +const char *trace_events;
>> +const char *trace_file;
>>  
>> +static void options_parse(int argc, char **argv)
>> +{
>
>While code modularization is a worthy goal, I don't think this patch is
>really an improvement. QEMU already has far too many adhoc global variables,
>without adding another 30 or more. The resulting code isn't even simplified
>or more readable IMHO, it is merely different.
>
>Daniel

There are about 856 lines of codes handle options parse in main function.
It is ugly and reduce readability. So I module these codes to a
single function called "options_parse".Since there are amounts of
command_line parameters which lead to must transfer many parameters to function
options_parse, so I expose some variables to global in order to handler
this issue.

Regards,
Wanpeng Li

-- 
LTC China, IBM, Shanghai