blokyk
daadfed9ae
See [lix-project/lix#1156], but basically currently the `:st <n>` debugger command doesn't allow any negative indices, and putting a plus sign in front of the arg doesn't change anything; thus, we can exploit that "design space" to allow users to move between different stack frames easily, by simply prepending their arg with a +/- sign. The actual behavior is little more nuanced when you account for errors: as suggested by @pennae (thanks! :), when the user inputs an offset that would result in an invalid frame index, the debugger instead clamps it to the closest bound (i.e. 0 for negative offsets, $maxFrame for positive ones) and just prints a warning. Fixes #1156 [lix-project/lix#1156]: https://git.lix.systems/lix-project/lix/issues/1156 Change-Id: I02a0cdb6aaebbdb0515308880a3bf9c0d2fcd25e
111 lines
2.6 KiB
Plaintext
111 lines
2.6 KiB
Plaintext
@args --debugger
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nix-repl> let f = _: throw "x_x"; x = f 5; in x
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error: x_x
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frames from 0 up to 4 work fine
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nix-repl> :st 0
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0: error: x_x
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«string»:1:12
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1| let f = _: throw "x_x"; x = f 5; in x
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| ^
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Env level 0
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static: _
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Env level 1
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static: f x
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Env level 2
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static:
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Env level 3
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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nix-repl> :st 4
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4: while evaluating a 'let' expression
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«string»:1:1
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1| let f = _: throw "x_x"; x = f 5; in x
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| ^
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Env level 0
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static: f x
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Env level 1
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static:
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Env level 2
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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absolute frames out of bounds print an error
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nix-repl> :st 5
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error: stack index must be between 0 and 4, but was 5
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argument-less :st is still at the same after absolute oob
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nix-repl> :st
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4: while evaluating a 'let' expression
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«string»:1:1
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1| let f = _: throw "x_x"; x = f 5; in x
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| ^
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Env level 0
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static: f x
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Env level 1
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static:
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Env level 2
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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positive relative frames oob clamp to upper bound and print a warning
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nix-repl> :st +5
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4: while evaluating a 'let' expression
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«string»:1:1
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1| let f = _: throw "x_x"; x = f 5; in x
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| ^
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Env level 0
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static: f x
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Env level 1
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static:
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Env level 2
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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warning: stopped at stack frame 4, cannot go any higher
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negative relative frames oob clamp to lower bound and print a warning
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nix-repl> :st -5
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0: error: x_x
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«string»:1:12
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1| let f = _: throw "x_x"; x = f 5; in x
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| ^
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Env level 0
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static: _
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Env level 1
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static: f x
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Env level 2
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static:
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Env level 3
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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warning: stopped at stack frame 0, cannot go any deeper
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quit
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nix-repl> :quit
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error: x_x
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