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| author | Ilya Zakharevich <ilya@math.ohio-state.edu> | 1997-01-08 03:25:47 -0500 |
|---|---|---|
| committer | Chip Salzenberg <chip@atlantic.net> | 1997-01-16 07:24:00 +1200 |
| commit | 7c5b83de28ae2ebfce6a3a7e907a300596342a30 (patch) | |
| tree | 5f4eea324a072d0392d1968b79d588dfc06ff179 /lib/ExtUtils | |
| parent | ac1ad7f00e63b0423f397847dd05653ab9cea16c (diff) | |
| download | perl-7c5b83de28ae2ebfce6a3a7e907a300596342a30.tar.gz | |
Re: xsubpp and Tk ==> segfault
Ilya Zakharevich writes:
>
> I recall that the reason why void code may be marked as XSRETURN(1) is
> that XS TUTORIAL recommended to mark XSUB as void if you manually put
It is not perlxstut, it is perlxs.
> in stack manipulation! I do not know why this horrible practice is
> blessed, but we need a workaround which would allow this mess, and
> would not make an XSUB
[Add: ] ... segfault if some Perl code was called in between.
As I found out, the only difference between an XSUB with a CODE:
section which is declared `void' and one which is declared "SV *" is
that the first one does not contain a line:
SV * RETVAL;
Is there any trouble if such a line is present?
If nobody will strongly object to it, I will remove an advice to
mark a CODE:-XSUBs as `void' from the POD(s).
I can also add a warning to xsubpp if a `void' XSUB sets ST(*). What
about it? (Warning will be issued only once per .xs .)
> Solution: Make the check for CODE section stricter: check for actuall
> occurence of "ST(" (with embedded spaces) before making the decision
> to XSRETURN(1).
The following patch is checked with Perl 3_17 and Tk (it checks for ST
at the LHS as an assignment):
Enjoy,
p5p-msgid: <199701080825.DAA15813@monk.mps.ohio-state.edu>
Diffstat (limited to 'lib/ExtUtils')
| -rwxr-xr-x | lib/ExtUtils/xsubpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/ExtUtils/xsubpp b/lib/ExtUtils/xsubpp index d43eb1cb23..76e45d6d99 100755 --- a/lib/ExtUtils/xsubpp +++ b/lib/ExtUtils/xsubpp @@ -842,6 +842,7 @@ while (fetch_para()) { $PPCODE = grep(/^\s*PPCODE\s*:/, @line); $CODE = grep(/^\s*CODE\s*:/, @line); + $EXPLICIT_RETURN = $CODE && ("@line" =~ /\bST\s*\([^;]*=/ ); $ALIAS = grep(/^\s*ALIAS\s*:/, @line); # print function header @@ -1025,7 +1026,7 @@ EOF # croak(errbuf); EOF - if ($ret_type ne "void" or $CODE) { + if ($ret_type ne "void" or $EXPLICIT_RETURN) { print Q<<EOF unless $PPCODE; # XSRETURN(1); EOF |