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":"integer","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","Display":"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":"floating","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":"array","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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