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__FL__ added and tested #3574

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__FL__ added and tested #3574

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9b114bd
Two changes: 1) __FL__ lexeme in FStarC_Parser_LexFStar.ml 2) tests/v…
briangmilnes Oct 16, 2024
6bcf77a
Moved to assert_norm instead of opening tactics and using assert(..) …
briangmilnes Oct 17, 2024
60f36d1
Moved Test.LexemeFL to micro-benchmarks got rid of tests/validation-time
briangmilnes Oct 19, 2024
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1 change: 1 addition & 0 deletions ocaml/fstar-lib/FStarC_Parser_LexFStar.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -473,6 +473,7 @@ match%sedlex lexbuf with
| "#print-effects-graph" -> PRAGMA_PRINT_EFFECTS_GRAPH
| "__SOURCE_FILE__" -> STRING (L.source_file lexbuf)
| "__LINE__" -> INT (string_of_int (L.current_line lexbuf), false)
| "__FL__" -> STRING ((L.source_file lexbuf) ^ "(" ^ (string_of_int (L.current_line lexbuf)) ^ ")")
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__FL__ seems a bit obscure to me, should we maybe call this __FILELINE__? But I don't have a strong opinion, would be good if others chime in.

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You have to reference it in every test so long is kind of cumbersome. For example:
let test_system n =
let r = FStar.Unix.system "echo HI" in
match r with
| WEXITED e -> if_test FL (e = 0) n None
| _ -> final_fail FL n None

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I agree with Guido, I aslo find FL a bit obscure.
IMO, aggregating LINE and SOURCE_FILE in this formatting is quite opinionated and should probably be user-defined.

@briangmilnes why not using a tactic for that here, e.g.:

module Hello
open FStar.Char
open FStar.Tactics

let fl
  (x: unit)
  (#[let sealed_range = range_of_term (quote x) in
     let range = unseal sealed_range in
     let result = FStar.Range.explode range in
     exact (quote result)] loc: string * int * int * int * int)
 = let file, line_start, col_start, _line_end, _col_end = loc in
   file ^ "(" ^ string_of_int line_start ^ ")"

// This is line 14
let file_line: string = fl ()
let _ = assert_norm (file_line == "<input>(15)")

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This is for logging and test packages. Nothing should be left to the user. In testing the ocaml wrap of unix and a few other things, I need the file/line 139 times. Terse is good here, although I eschew it in almost all situations.

A tactic that allows a function is a great alternative. The language server in emacs takes that and works but I can't get a command line to compile it. What's the change needed for compilation? It also has the advantage that the strings are not coming back from the lexer with strange UTF8.

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Well, verbosity or terseness is a choice, right? I tend to prefer verbosity in such cases, but that's only my preference.

Nice! Here it won't work via the command line because of <input>: that's the file name given by the F* interactive protocol used by emacs I believe.
Running that from a file whose path is /tmp/Hello.fst, you should be able to assert_norm (file_line == "/tmp/Hello.fst(15)") (instead of the one I've put above).

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The issue I have is it will not compile, not the string back from fl() or FL.

F*orge: VALIDATE _build/fstar/fst/checked/Hello.fst.checked

  • Error 168 at src/Hello.fst(8,8-8,8):
    • Syntax error

1 error was reported (see above)
That's the (# line on my test of it running in OCaml.


| Plus anywhite -> token lexbuf
| newline -> L.new_line lexbuf; token lexbuf
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13 changes: 13 additions & 0 deletions tests/micro-benchmarks/Test.LexemeFL.fst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
/// A new lexeme __FL__ has been added to show file and line (file(line)) to make writing tests easier.
/// This file is line sensitive any edit will change the value of __FL__.
module Test.LexemeFL

open FStar.String
module LT = FStar.List.Tot
// Kinda funky to get a good validation time test, added Strings in other PR will fix this.
// The lexer is sending back some strange character that we have to adjust.
let fl = __FL__
let _ = assert(fl <> "")
let fl' = string_of_list (list_of_string "Test.LexemFL.fst(11)")
let _ = assert_norm((strlen fl') = 20)
let _ = assert_norm(fl' = "Test.LexemFL.fst(11)")
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