Re: [tcf-dev] Quick expressions support in TCF

[Eugene Tarassov <eugene.tarassov@xxxxxxxxxx>]

Hi Frederic,

Yes, it could be a value-add. I, personally, just don't see much value in it. The Expressions service works fine for me, I don't see any problems. At same time, there are so many great things that would be really nice to support - more architectures (MIPS, PPC, etc.), OCD, JTAG, tracing, OS awareness, Android, iOS, Xen... I'd rather work on those.

Regards,
Eugene

-----Original Message-----
From: tcf-dev-bounces@xxxxxxxxxxx [mailto:tcf-dev-bounces@xxxxxxxxxxx] On Behalf Of Frederic LEGER
Sent: Monday, August 22, 2016 11:57 PM
To: TCF Development
Subject: Re: [tcf-dev] Quick expressions support in TCF

All,

what about adding a value-add to the opensource agent tree then ?
This would also help any user to get started with value-add ...

DERF

On 08/22/2016 07:54 PM, Eugene Tarassov wrote:
> Hi Benoit,
>
>
>
> I don't want the agent to be concerned with presentation of data,
> choosing between decimal, hex and other formats, choosing an icon,
> choosing character attributes like font and color, implement "pretty
> printing" and so on. I don't believe it will necessarily improve
> performance: when symbol resolution is done locally by the symbols
> server and client uses caches and command coalescing, such service can
> actually degrade performance, epically since local machine is usually
> much more powerful that the remove one. I don't want Eclipse GUI to be
> changed to use a new service - at least for backward compatibility, if
> nothing else. I don't want to provide maintenance and support for
> non-essential services like that, e.g. develop and maintain addition
> regression tests automation for that.
>
>
>
> However, I understand that such service might be appealing for someone
> looking to make it easier to implement a simple client. If we can call
> this service optional, create a separate source directory for services
> like that, and don't commit to support it, then I'm OK with it.
>
>
>
> Regards,
>
> Eugene
>
>
>
>
>
>
>
> *From:*tcf-dev-bounces@xxxxxxxxxxx
> [mailto:tcf-dev-bounces@xxxxxxxxxxx]
> *On Behalf Of *Benoit Perrin
> *Sent:* Monday, August 22, 2016 3:48 AM
> *To:* tcf-dev@xxxxxxxxxxx
> *Subject:* [tcf-dev] Quick expressions support in TCF
>
>
>
> Hello TCF dev,
>
> I would like to contribute a new service to the TCF agent. This
> service can be used by client instead of the Expressions service to
> get basic information about expressions with few TCF requests. So, in
> the context of a connection with high network latencies, a client can
> visualize expressions quicker.
>
> The service returns less information than the Expressions service;
> instead, it returns high level data that a UI client can display
> directly without extra requests. For example, it returns the value of
> the expression as a string and gives a quick access to the children of
> the expression (e.g. pointer, array, structure for C language).
>
> For example, for a C structure like:
>
> test.integer = 1234;
>
> test.string = "A string";
>
> test.floating = 3.14;
>
> test.array[0] = 'A';
>
> Evaluating the expressions with this service, it returns the info:
>
>  {"Error":null,"TypeName":"struct
> TEST","TypeKind":6,"Value":"0x00007FFF9CFB81A0","HasChildren":true,"ID":"WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.79*28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81A0"
> <mailto:WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.79
> *28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81A0>,"Label":"test
> ","Display":"test
> : 0x00007FFF9CFB81A0"}
>
> The "Display" field is a proposition of a display of the expression
> 'test' that the client can use directly.
>
> Getting the children of the expressions, it returns a list of info:
>
>  [{"Error":null,"SymbolName":"integer","TypeName":"int","TypeKind":2,"Value":"1234","ID":"WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.57*28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81A0"
> <mailto:WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.57
> *28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81A0>,"Label":"inte
> ger","Display":"integer : 1234"},
>
> {"Error":null,"SymbolName":"string","TypeName":"char *","TypeKind":4,"Value":"0x0000000000400634","HasChildren":true,"ID":"WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.6C*28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.400634"
> <mailto:WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.6C
> *28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.400634>,"Label":"string","D
> isplay":"string : 0x0000000000400634 \"A string\""},
>
> {"Error":null,"SymbolName":"floating","TypeName":"double","TypeKind":3,"Value":"3.140000000000000","ID":"WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.B6*28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81B0"
> <mailto:WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.B6
> *28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81B0>,"Label":"floa
> ting","Display":"floating : 3.140000000000000"},
>
> {"Error":null,"SymbolName":"array","TypeName":"char [10]","TypeKind":5,"Value":"0x00007FFF9CFB81B8","HasChildren":true,"ID":"WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.BD*28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81B8"
> <mailto:WREXPR.10.FP0.P18456.18456.48.@M0.@S4%28.B708DE.57BACF34.1C.BD
> *28.B708DE.57BACF34.1C.EA+2.0.0.0.P18456.1.7FFF9CFB81B8>,"Label":"arra
> y","Display":"array : 0x00007FFF9CFB81B8 \"A\\u0004@\""}]
>
> With only two requests to the agent, the client is able to display
> basic information about a frame variable.
>
>
> Do you think there is an interest by this contribution to the core TCF?
>
> Any comment/suggestion is welcome.
>
> Benoit
>
>
> --
>
> Benoit Perrin, Senior Member of Technical Staff, Wind River
>
>
>
>
>
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