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[docs] Fix #41636 and add description for undefcheck #41780

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Aug 24, 2021
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[docs] Fix #41636 and add description for undefcheck #41780

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8 changes: 6 additions & 2 deletions doc/src/devdocs/ast.md
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Expand Up @@ -438,6 +438,10 @@ These symbols appear in the `head` field of [`Expr`](@ref)s in lowered form.

Yields the caught exception inside a `catch` block, as returned by `jl_current_exception()`.

* `undefcheck`

Temporary node inserted by the compiler and will be processed in `type_lift_pass!`.

* `enter`

Enters an exception handler (`setjmp`). `args[1]` is the label of the catch block to jump to on
Expand Down Expand Up @@ -507,11 +511,11 @@ These symbols appear in the `head` field of [`Expr`](@ref)s in lowered form.

The calling convention for the call.

* `args[6:6+length(args[3])]` : arguments
* `args[6:5+length(args[3])]` : arguments

The values for all the arguments (with types of each given in args[3]).

* `args[6+(length(args[3])+1):end]` : gc-roots
* `args[6+length(args[3])+1:end]` : gc-roots

The additional objects that may need to be gc-rooted for the duration of the call.
See [Working with LLVM](@ref Working-with-LLVM) for where these are derived from and how they get handled.
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