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HIGHLY EXPERIMENTAL - Debugger #21

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@reubent reubent commented Jul 27, 2020

Needs tidy up and some docs. Just put here for visibility for now.

@bmatsuo-at-luthersystems
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bmatsuo-at-luthersystems commented Sep 25, 2020

I was testing out the delve debugger and got a panic in the go runtime.

elps run -d -t delve approx.lisp (connected the debugger with dlv connect localhost:8883)

approx.lisp is in the _examples/sicp/ directory.

Then I just run continue in delve without setting any breakpoints or anything. I got the following log output and stack trace:

INFO[0155] RUN
panic: runtime error: index out of range [7] with length 7

goroutine 1 [running]:
github.com/luthersystems/elps/lisp/x/debugger.(*Debugger).Start(0xc0001c4a00, 0xc0004c0360, 0xc00021c0c0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/x/debugger/debugger.go:197 +0x14a3
github.com/luthersystems/elps/lisp.(*LEnv).EvalSExpr(0xc00057f980, 0xc0004c0360, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:775 +0x2c2
github.com/luthersystems/elps/lisp.(*LEnv).Eval(0xc00057f980, 0xc0004c0360, 0x4)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:734 +0xc0
github.com/luthersystems/elps/lisp.(*LEnv).call(0xc00057f800, 0xc00021cf60, 0xc000221080, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:1078 +0x264
github.com/luthersystems/elps/lisp.(*LEnv).funCall(0xc00057f800, 0xc00021cf60, 0xc000221080, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:914 +0x2be
github.com/luthersystems/elps/lisp.(*LEnv).FunCall(0xc00057f800, 0xc00021cf60, 0xc000221080, 0x58)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:884 +0x3f
github.com/luthersystems/elps/lisp.(*LEnv).EvalSExpr(0xc00057f800, 0xc0004c0ba0, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:780 +0x283
github.com/luthersystems/elps/lisp.(*LEnv).Eval(0xc00057f800, 0xc0004c0ba0, 0xc0004c0b40)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:734 +0xc0
github.com/luthersystems/elps/lisp.opLet(0xc00015ae40, 0xc000220a20, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/op.go:443 +0x207
github.com/luthersystems/elps/lisp.(*langBuiltin).Eval(0x1b30520, 0xc00015ae40, 0xc000220a20, 0x100)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/builtins.go:39 +0x3e
github.com/luthersystems/elps/lisp.(*LEnv).call(0xc00015ae40, 0xc00025c9c0, 0xc000220840, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:1037 +0x427
github.com/luthersystems/elps/lisp.(*LEnv).SpecialOpCall(0xc00015ae40, 0xc00025c9c0, 0xc000220840, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:857 +0x1a7
github.com/luthersystems/elps/lisp.(*LEnv).EvalSExpr(0xc00015ae40, 0xc0002206c0, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:782 +0x217
github.com/luthersystems/elps/lisp.(*LEnv).Eval(0xc00015ae40, 0xc0004c0a80, 0xc00021d9e0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:734 +0xc0
github.com/luthersystems/elps/lisp.(*LEnv).load(0xc00015ae40, 0xc000072400, 0x52, 0x80, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:235 +0x22e
github.com/luthersystems/elps/lisp.(*LEnv).LoadLocation(0xc00015ae40, 0xc00046e5a0, 0x9, 0xc00046e5a0, 0x9, 0x1755d20, 0xc000348480, 0xc00046e5a0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:216 +0x174
github.com/luthersystems/elps/lisp.(*LEnv).LoadFile(0xc00015ae40, 0xc00046e5a0, 0x9, 0x1148c70)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:171 +0x2c8
github.com/luthersystems/elps/lisp.builtinLoadFile(0xc00015ae40, 0xc00047be00, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/builtins.go:229 +0xb7
github.com/luthersystems/elps/lisp.(*langBuiltin).Eval(0x1b30660, 0xc00015ae40, 0xc00047be00, 0x100)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/builtins.go:39 +0x3e
github.com/luthersystems/elps/lisp.(*LEnv).call(0xc00015ae40, 0xc00025dc80, 0xc00047bce0, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:1037 +0x427
github.com/luthersystems/elps/lisp.(*LEnv).funCall(0xc00015ae40, 0xc00025dc80, 0xc00047bce0, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:914 +0x2be
github.com/luthersystems/elps/lisp.(*LEnv).FunCall(0xc00015ae40, 0xc00025dc80, 0xc00047bce0, 0xc00047bbc0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:884 +0x3f
github.com/luthersystems/elps/lisp.(*LEnv).EvalSExpr(0xc00015ae40, 0xc0003d12c0, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:780 +0x283
github.com/luthersystems/elps/lisp.(*LEnv).Eval(0xc00015ae40, 0xc0003d12c0, 0xc00047bbc0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:734 +0xc0
github.com/luthersystems/elps/lisp.(*LEnv).load(0xc00015ae40, 0xc0002ea400, 0x41, 0x80, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:235 +0x22e
github.com/luthersystems/elps/lisp.(*LEnv).LoadLocation(0xc00015ae40, 0xc000381860, 0xb, 0xc000381860, 0xb, 0x1755d20, 0xc000348360, 0xc000381860)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:216 +0x174
github.com/luthersystems/elps/lisp.(*LEnv).LoadFile(0xc00015ae40, 0xc000381860, 0xb, 0x1148c70)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:171 +0x2c8
github.com/luthersystems/elps/lisp.builtinLoadFile(0xc00015ae40, 0xc0003d1080, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/builtins.go:229 +0xb7
github.com/luthersystems/elps/lisp.(*langBuiltin).Eval(0x1b30660, 0xc00015ae40, 0xc0003d1080, 0x100)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/builtins.go:39 +0x3e
github.com/luthersystems/elps/lisp.(*LEnv).call(0xc00015ae40, 0xc00025dc80, 0xc0003d0f60, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:1037 +0x427
github.com/luthersystems/elps/lisp.(*LEnv).funCall(0xc00015ae40, 0xc00025dc80, 0xc0003d0f60, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:914 +0x2be
github.com/luthersystems/elps/lisp.(*LEnv).FunCall(0xc00015ae40, 0xc00025dc80, 0xc0003d0f60, 0xc0003d0e40)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:884 +0x3f
github.com/luthersystems/elps/lisp.(*LEnv).EvalSExpr(0xc00015ae40, 0xc000346a80, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:780 +0x283
github.com/luthersystems/elps/lisp.(*LEnv).Eval(0xc00015ae40, 0xc000346a80, 0xc0003d0e40)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:734 +0xc0
github.com/luthersystems/elps/lisp.(*LEnv).load(0xc00015ae40, 0xc000256a00, 0x14, 0x20, 0x0)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:235 +0x22e
github.com/luthersystems/elps/lisp.(*LEnv).LoadLocation(0xc00015ae40, 0x7ffeefbff84d, 0xb, 0x7ffeefbff84d, 0xb, 0x1755d20, 0xc000348120, 0x7ffeefbff84d)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:216 +0x174
github.com/luthersystems/elps/lisp.(*LEnv).LoadFile(0xc00015ae40, 0x7ffeefbff84d, 0xb, 0x1678f9a)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/lisp/env.go:171 +0x2c8
github.com/luthersystems/elps/cmd.glob..func2(0x1b37ae0, 0xc000172300, 0x1, 0x4)
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/cmd/run.go:71 +0x495
github.com/spf13/cobra.(*Command).execute(0x1b37ae0, 0xc0001722c0, 0x4, 0x4, 0x1b37ae0, 0xc0001722c0)
        /Users/bmatsuo/go/pkg/mod/github.com/spf13/cobra@v0.0.3/command.go:766 +0x2aa
github.com/spf13/cobra.(*Command).ExecuteC(0x1b37880, 0x103cffa, 0x1af44e0, 0xc000000180)
        /Users/bmatsuo/go/pkg/mod/github.com/spf13/cobra@v0.0.3/command.go:852 +0x2ea
github.com/spf13/cobra.(*Command).Execute(...)
        /Users/bmatsuo/go/pkg/mod/github.com/spf13/cobra@v0.0.3/command.go:800
github.com/luthersystems/elps/cmd.Execute()
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/cmd/root.go:31 +0x31
main.main()
        /Users/bmatsuo/go/src/github.com/luthersystems/elps/main.go:11 +0x20

File: fmt.Sprintf("%s", source.Path),
Line: source.Line,
Function: &api.Function{
Name_: "f",
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Is it not possible to use LEnv.GetFunName here? I noticed this in delve.

(dlv) bt
0  0x0000000000000000 in f
   at approx.lisp:5
1  0x0000000000000000 in f
   at stream.lisp:5
2  0x0000000000000000 in f
   at :0
3  0x0000000000000000 in f
   at sicp.lisp:21
4  0x0000000000000000 in f
   at sicp.lisp:14

If the function name isn't available might it be better to just use the FID from the stack from?

@reubent
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reubent commented Oct 26, 2020

@bmatsuo-at-luthersystems Personally, I much prefer the JetBrains IDEs to VSCode, but since everyone I know who is using ELPS is using VSCode, I've put 99% of the effort into that. Hence, I've not done as much work on the delve version as the DAP one and would recommend that you use the DAP one - you can use it by running this version of Amir's VSCode extension https://gitlab.com/amirH.A/vscode-elps/-/merge_requests/1/diffs

The DAP version is much more stable and does pretty much everything you'd expect a debugger to do. There's a nice video of how to use it floating about - I am pretty sure Sam has it, but if not drop me an email and I'll dig it out for you.

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