Enforce call stack depth limit for all calls (#11729)

# Description
Previously, only direcly-recursive calls were checked for recursion
depth. But most recursive calls in nushell are mutually recursive since
expressions like `for`, `where`, `try` and `do` all execute a separte
block.

```nushell
def f [] {
    do { f }
}
```
Calling `f` would crash nushell with a stack overflow.

I think the only general way to prevent such a stack overflow is to
enforce a maximum call stack depth instead of only disallowing directly
recursive calls.

This commit also moves that logic into `eval_call()` instead of
`eval_block()` because the recursion limit is tracked in the `Stack`,
but not all blocks are evaluated in a new stack. Incrementing the
recursion depth of the caller's stack would permanently increment that
for all future calls.

Fixes #11667

# User-Facing Changes
Any function call can now fail with `recursion_limit_reached` instead of
just directly recursive calls. Mutually-recursive calls no longer crash
nushell.

# After Submitting
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documentation](https://github.com/nushell/nushell.github.io) after the
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This commit is contained in:
TrMen
2024-02-07 23:42:24 +01:00
committed by GitHub
parent 366348dea0
commit 4b91ed57dd
5 changed files with 40 additions and 63 deletions

View File

@ -10,7 +10,6 @@ pub struct Block {
pub captures: Vec<VarId>,
pub redirect_env: bool,
pub span: Option<Span>, // None option encodes no span to avoid using test_span()
pub recursive: Option<bool>, // does the block call itself?
}
impl Block {
@ -51,7 +50,6 @@ impl Block {
captures: vec![],
redirect_env: false,
span: None,
recursive: None,
}
}
@ -62,7 +60,6 @@ impl Block {
captures: vec![],
redirect_env: false,
span: None,
recursive: None,
}
}
@ -97,7 +94,6 @@ where
captures: vec![],
redirect_env: false,
span: None,
recursive: None,
}
}
}