Implement facility to plug in syntax triggered by keywords

Date: Tue, 27 Oct 2009 01:29:40 +0000
From: Zefram <zefram@fysh.org>
To: perl5-porters@perl.org
Subject: bareword sub lookups

Attached is a patch that changes how the tokeniser looks up subroutines,
when they're referenced by a bareword, for prototype and const-sub
purposes.  Formerly, it has looked up bareword subs directly in the
package, which is contrary to the way the generated op tree looks up
the sub, via an rv2cv op.  The patch makes the tokeniser generate the
rv2cv op earlier, and dig around in that.

The motivation for this is to allow modules to hook the rv2cv op
creation, to affect the name->subroutine lookup process.  Currently,
such hooking affects op execution as intended, but everything goes wrong
with a bareword ref where the tokeniser looks at some unrelated CV,
or a blank space, in the package.  With the patch in place, an rv2cv
hook correctly affects the tokeniser and therefore the prototype-based
aspects of parsing.

The patch also changes ck_subr (which applies the argument context and
checking parts of prototype behaviour) to handle subs referenced by an
RV const op inside the rv2cv, where formerly it would only handle a gv
op inside the rv2cv.  This is to support the most likely kind of modified
rv2cv op.

[This commit includes the Makefile.PL for XS-APITest-KeywordRPN missing
from the original patch, as well as updates to perldiag.pod and a
MANIFEST sort]

1 files changed, 3 insertions, 3 deletions

diff --git a/Porting/config.sh b/Porting/config.sh
index b958755cb1..c18faa4876 100644
--- a/Porting/config.sh
+++ b/Porting/config.sh
@@ -560,7 +560,7 @@ doublesize='8'
 drand01='drand48()'
 drand48_r_proto='0'
 dtrace=''
-dynamic_ext='attributes B Compress/Raw/Zlib Cwd Data/Dumper DB_File Devel/DProf Devel/Peek Devel/PPPort Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util Math/BigInt/FastCalc MIME/Base64 NDBM_File ODBM_File Opcode PerlIO/encoding PerlIO/scalar PerlIO/via POSIX re SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex threads Time/HiRes Time/Piece Unicode/Normalize XS/APItest XS/Typemap threads/shared Hash/Util/FieldHash'
+dynamic_ext='attributes B Compress/Raw/Zlib Cwd Data/Dumper DB_File Devel/DProf Devel/Peek Devel/PPPort Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util Math/BigInt/FastCalc MIME/Base64 NDBM_File ODBM_File Opcode PerlIO/encoding PerlIO/scalar PerlIO/via POSIX re SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex threads Time/HiRes Time/Piece Unicode/Normalize XS/APItest XS/APItest/KeywordRPN XS/Typemap threads/shared Hash/Util/FieldHash'
 eagain='EAGAIN'
 ebcdic='undef'
 echo='echo'
@@ -575,7 +575,7 @@ endservent_r_proto='0'
 eunicefix=':'
 exe_ext=''
 expr='expr'
-extensions='attributes B Compress/Raw/Zlib Cwd Data/Dumper DB_File Devel/DProf Devel/Peek Devel/PPPort Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util Math/BigInt/FastCalc MIME/Base64 NDBM_File ODBM_File Opcode PerlIO/encoding PerlIO/scalar PerlIO/via POSIX re SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex threads Time/HiRes Time/Piece Unicode/Normalize XS/APItest XS/Typemap threads/shared Hash/Util/FieldHash Compress/Zlib Errno IO_Compress_Base IO_Compress_Zlib Module/Pluggable Test/Harness'
+extensions='attributes B Compress/Raw/Zlib Cwd Data/Dumper DB_File Devel/DProf Devel/Peek Devel/PPPort Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util Math/BigInt/FastCalc MIME/Base64 NDBM_File ODBM_File Opcode PerlIO/encoding PerlIO/scalar PerlIO/via POSIX re SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex threads Time/HiRes Time/Piece Unicode/Normalize XS/APItest XS/APItest/KeywordRPN XS/Typemap threads/shared Hash/Util/FieldHash Compress/Zlib Errno IO_Compress_Base IO_Compress_Zlib Module/Pluggable Test/Harness'
 extern_C='extern'
 extras=''
 fflushNULL='define'
@@ -767,7 +767,7 @@ issymlink='test -h'
 ivdformat='"Ld"'
 ivsize='8'
 ivtype='long long'
-known_extensions='attributes B Compress/Raw/Zlib Cwd Data/Dumper DB_File Devel/DProf Devel/Peek Devel/PPPort Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util Math/BigInt/FastCalc MIME/Base64 NDBM_File ODBM_File Opcode PerlIO/encoding PerlIO/scalar PerlIO/via POSIX re SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex threads Time/HiRes Time/Piece Unicode/Normalize Win32 Win32API/File Win32CORE XS/APItest XS/Typemap threads/shared Hash/Util/FieldHash'
+known_extensions='attributes B Compress/Raw/Zlib Cwd Data/Dumper DB_File Devel/DProf Devel/Peek Devel/PPPort Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util Math/BigInt/FastCalc MIME/Base64 NDBM_File ODBM_File Opcode PerlIO/encoding PerlIO/scalar PerlIO/via POSIX re SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex threads Time/HiRes Time/Piece Unicode/Normalize Win32 Win32API/File Win32CORE XS/APItest XS/APItest/KeywordRPN XS/Typemap threads/shared Hash/Util/FieldHash'
 ksh=''
 ld='cc'
 lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'