From |g@ut|er @end|ng |rom gm@||@com  Sat Nov 30 23:33:33 2019
From: |g@ut|er @end|ng |rom gm@||@com (Laurent Gautier)
Date: Sat, 30 Nov 2019 17:33:33 -0500
Subject: [Rd] Inconsistent behavior for the C AP's R_ParseVector() ?
In-Reply-To: <CA+JCgN0vZ8O1ekweEgPqcH202PKU2dfMW959eF=Q2S8K1OSKeQ@mail.gmail.com>
References: <CA+JCgN0vZ8O1ekweEgPqcH202PKU2dfMW959eF=Q2S8K1OSKeQ@mail.gmail.com>
Message-ID: <CA+JCgN05ZRAuWwMEKX77jcfOw7s3g=Sf+vxRjVrVQbUfEutmoA@mail.gmail.com>

I found the following code comment in `src/main/gram.c`:

```

/* Memory leak

yyparse(), as generated by bison, allocates extra space for the parser
stack using malloc(). Unfortunately this means that there is a memory
leak in case of an R error (long-jump). In principle, we could define
yyoverflow() to relocate the parser stacks for bison and allocate say on
the R heap, but yyoverflow() is undocumented and somewhat complicated
(we would have to replicate some macros from the generated parser here).
The same problem exists at least in the Rd and LaTeX parsers in tools.
*/

```

Could this be related to be issue ?

Le sam. 30 nov. 2019 ? 14:04, Laurent Gautier <lgautier at gmail.com> a ?crit :

> Hi,
>
> The behavior of
> ```
> SEXP R_ParseVector(SEXP, int, ParseStatus *, SEXP);
> ```
> defined in `src/include/R_ext/Parse.h` appears to be inconsistent
> depending on the string to be parsed.
>
> Trying to parse a string such as `"list(''=1+"` sets the
> `ParseStatus` to incomplete parsing error but trying to parse
> `"list(''=123"` will result in R sending a message to the console (followed but a crash):
>
> ```
> R[write to console]: Error: attempt to use zero-length variable nameR[write to console]: Fatal error: unable to initialize the JIT*** stack smashing detected ***: <unknown> terminated
> ```
>
> Is there a reason for the difference in behavior, and is there a workaround ?
>
> Thanks,
>
>
> Laurent
>
>

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[Rd] Inconsistent behavior for the C AP's R_ParseVector() ?
Laurent Gautier