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7434caca05
This fixes a segfault on infinite function call recursion (rather than
infinite thunk recursion) by tracking the function call depth in
`EvalState`.
Additionally, to avoid printing extremely long stack traces, stack
frames are now deduplicated, with a `(19997 duplicate traces omitted)`
message. This should only really be triggered in infinite recursion
scenarios.
Before:
$ nix-instantiate --eval --expr '(x: x x) (x: x x)'
Segmentation fault: 11
After:
$ nix-instantiate --eval --expr '(x: x x) (x: x x)'
error: stack overflow
at «string»:1:14:
1| (x: x x) (x: x x)
| ^
$ nix-instantiate --eval --expr '(x: x x) (x: x x)' --show-trace
error:
… from call site
at «string»:1:1:
1| (x: x x) (x: x x)
| ^
… while calling anonymous lambda
at «string»:1:2:
1| (x: x x) (x: x x)
| ^
… from call site
at «string»:1:5:
1| (x: x x) (x: x x)
| ^
… while calling anonymous lambda
at «string»:1:11:
1| (x: x x) (x: x x)
| ^
… from call site
at «string»:1:14:
1| (x: x x) (x: x x)
| ^
(19997 duplicate traces omitted)
error: stack overflow
at «string»:1:14:
1| (x: x x) (x: x x)
| ^
44 lines
1.2 KiB
Text
44 lines
1.2 KiB
Text
error:
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… from call site
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at /pwd/lang/eval-fail-duplicate-traces.nix:9:3:
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8| in
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9| throwAfter 2
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| ^
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10|
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… while calling 'throwAfter'
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at /pwd/lang/eval-fail-duplicate-traces.nix:4:16:
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3| let
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4| throwAfter = n:
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| ^
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5| if n > 0
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… from call site
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at /pwd/lang/eval-fail-duplicate-traces.nix:6:10:
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5| if n > 0
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6| then throwAfter (n - 1)
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| ^
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7| else throw "Uh oh!";
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… while calling 'throwAfter'
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at /pwd/lang/eval-fail-duplicate-traces.nix:4:16:
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3| let
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4| throwAfter = n:
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| ^
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5| if n > 0
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… from call site
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at /pwd/lang/eval-fail-duplicate-traces.nix:6:10:
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5| if n > 0
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6| then throwAfter (n - 1)
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| ^
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7| else throw "Uh oh!";
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… while calling 'throwAfter'
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at /pwd/lang/eval-fail-duplicate-traces.nix:4:16:
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3| let
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4| throwAfter = n:
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| ^
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5| if n > 0
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error: Uh oh!
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