[swift-lldb-dev] Hello Perry,

[Jim Ingham]

Just to be clear what we're talking about here.  lldb has an expression parser as one of its general features.  That expression parser can run in two modes.  In one, the expression parser emulates "code run in the context of the currently selected frame." This is the expression parser invoked with no special options.  In the other it emulates code typed into a main swift file (albeit incrementally evaluated) - use "expr --repl" for this mode.  In this mode the expressions can see other entities defined in the REPL, and you can load swift modules into to REPL.  But it doesn't have access to local variables, etc.

So if you are trying to use the expression evaluator alongside a program you are debugging, then you want the basic expression evaluator, not the REPL.  If you want to use the expression evaluator as a place to just try out code ab initio, you want "expr --repl".

The overall "lldb --repl" which is pretty much what the "swift" command with no arguments does, also starts up a trivial target app so we'll have something into which to inject code.

There are also SB API's to access both modes of expression evaluation.  For instance, you can evaluate a single expression in REPL mode using the SBExpressionEvaluationOptions SetREPLEnabled for this purpose.  You would use these in SBTarget::EvaluateExpression or SBFrame::EvaluateExpression.

The other part of the REPL is all the input magic it does to handle multi-line editing, etc.  That code as written relies on cooperation between the IOHandler classes that deal with input and the overall lldb driver program, and isn't quite a cleanly separated as it should be.  It is our intention to make the IOHandler code more easily useable by other external clients, but that work is still on the drawing board.  In the mean time, you would just gather user input and feed it to the expression parser with the appropriate options.

Jim

> On Dec 7, 2015, at 2:16 PM, Gage Morgan via swift-lldb-dev <swift-lldb-dev at swift.org> wrote:
> 
> VSCode is Microsoft's open source IDE. I'd like to include a window that uses REPL to analyze the code and display the effects on the window right next to it. 
> 
> Sent from Outlook
> 
> 
> 
> 
> On Mon, Dec 7, 2015 at 1:12 PM -0800, "Todd Fiala" <todd.fiala at gmail.com> wrote:
> 
> 
> 
> On Mon, Dec 7, 2015 at 1:04 PM, Gage Morgan via swift-lldb-dev <swift-lldb-dev at swift.org> wrote:
> So would it be possible to develop a Playground-like debugger using Gtk+, Swift, and VSCode using REPL?
> 
> To the extent that you want to look at, analyze, and even borrow some (or all) of the code in Swift LLDB and Swift-proper to do so, nothing in the swift.org and llvm.org licenses would prevent you from doing so.  They are permissive licenses.  They just require attribution (see the licenses for details).
> 
> I know nothing about VSCode, so that may have its own set of licensing requirements.  You would need to investigate that independently.
>  
> 
> Sent from Outlook
> 
> 
> 
> 
> On Mon, Dec 7, 2015 at 10:17 AM -0800, "Todd Fiala" <tfiala at apple.com> wrote:
> 
> 
>> On Dec 5, 2015, at 12:25 PM, Gage Morgan via swift-lldb-dev <swift-lldb-dev at swift.org> wrote:
>> 
>> As your question is similar to the one I have, does Apple explicitly say what we can and cannot do with REPL on Linux?
>> 
> 
> Hi Gage,
> 
> Great question!  Swift.org was setup to encourage collaboration and expansion of the Swift ecosystem, both in terms of platform and feature set.  Community contributions to expand usage of the REPL in new and novel ways is encouraged, whether it be to support a new platform, a new windowing mechanism or to incorporate in a program as an extension language.  Apple is not attempting to limit the scope of community contributions; rather, we’re explicitly encouraging it by open sourcing Swift.
> 
> You are welcome to take any part of the REPL and modify and/or incorporate into your program.  The swift.org and llvm.org licenses just ask that you attribute the code borrowed (per their licenses) in your product.  Go forth and make great things :-)
> 
> Sincerely,
> Todd Fiala
> 
> 
>> Sent from Outlook
>> 
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> -- 
> -Todd
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