perl-check

This is a clang-tidy plugin that currently checks for calls to sv_setpvn() with a literal string, which are better written with sv_setpvs().

Building the module

Install clang and its development libraries, I used the debs from apt.llvm.org, and tested with llvm 18.

You also need cmake, you may also want libedit-dev.

cmake -B build
cmake --build build

which should create libperl-check.so in build/. You'll need the path to this and to .perl-clang-tidy in this directory.

If you have multiple versions of clang installed cmake seems to select the first clang it finds going by directory order, you can control that with CMAKE_PREFIX_PATH, for example:

export CMAKE_PREFIX_PATH=/usr/lib/llvm-20
cmake -B build
cmake --build build

Build a compilation database

For your perl build

Switch to your perl checkout, you need to start with a clean tree.

This requires the bear tool, I used the Debian packaged version.

./Configure ... -Dcc=clang-18
bear -- make

You should now have compile-commands.json

For an XS module

Switch to your XS root, assuming an ExtUtils::MakeMaker build:

perl Makefile.PL
bear -- make

You will need to supply

Invoking clang-tidy

clang-tidy-18 --load=path/to/build/libperl-check.so --checks='-*,perl-*' --config='{"CheckOptions":{"PerlCheckMultiplicity":1}}' source.c

The clang-tidy invoked should match the version the loadable module was built with, the simplest way to see that is:

$ grep Clang_DIR build/CMakeCache.txt
Clang_DIR:PATH=/usr/lib/cmake/clang-18

You can also use run-clang-tidy to avoid test all sources, or all sources matching a regular expression:

run-clang-tidy-18 -load=path/to/build/libperl-check.so -checks='-*,perl-*' -config='{"CheckOptions":{"PerlCheckMultiplicity":1}}'

Note the change from -- to - for the options.

Example output

Edited out the files with no issues found to reduce noise.

$ run-clang-tidy-18 -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so -checks='-*,perl-*' -config='{"CheckOptions":{"PerlCheckMultiplicity":1}}' 'perl6/[a-z_]+\.c'
Enabled checks:
    perl-literal-get_cvn_flags
    perl-literal-hv_fetch
    perl-literal-newSVpvn
    perl-literal-newSVpvn_flags
    perl-literal-savepvn
    perl-literal-sv_catpvn
    perl-literal-sv_catpvn_flags
    perl-literal-sv_catpvn_nomg
    perl-literal-sv_setpvn
    perl-literal-sv_setpvn_mg
    perl-mortal-newSVpvn
    perl-mortal-newSVsv
    perl-undef-sv_setpv
    perl-undef-sv_setpvn
    perl-undef-sv_setsv

...
mro_core.c:1195:39: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 1195 |                             subname = sv_2mortal(newSVsv(namesv));
      |                                       ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
mro_core.c:1278:39: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 1278 |                             subname = sv_2mortal(newSVsv(namesv));
      |                                       ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
4 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/hv.c
hv.c:701:29: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
  701 |                     keysv = sv_2mortal(newSVsv(keysv));
      |                             ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/gv.c
gv.c:2200:29: warning: sv_setsv(..., &PL_sv_undef) better written as sv_set_undef() [perl-undef-sv_setsv]
 2200 |                             sv_setsv(*init, &PL_sv_undef);
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                             sv_set_undef(*init)
./embed.h:804:49: note: expanded from macro 'sv_setsv'
  804 | # define sv_setsv(a,b)                          Perl_sv_setsv(aTHX,a,b)
      |                                                 ^
./sv.h:2274:9: note: expanded from macro 'Perl_sv_setsv'
 2274 |         Perl_sv_setsv_flags(aTHX_ dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
      |         ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/dump.c
dump.c:3109:15: warning: newSVpvn_flags() with literal better written as newSVpvs_flags() [perl-literal-newSVpvn_flags]
 3109 |     SV *out = newSVpvn_flags("",0,SVs_TEMP);
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |               newSVpvs_flags("", SVs_TEMP)
./embed.h:468:49: note: expanded from macro 'newSVpvn_flags'
  468 | # define newSVpvn_flags(a,b,c)                  Perl_newSVpvn_flags(aTHX_ a,b,c)
      |                                                 ^
dump.c:3252:15: warning: newSVpvn_flags() with literal better written as newSVpvs_flags() [perl-literal-newSVpvn_flags]
 3252 |     SV *out = newSVpvn_flags("", 0, SVs_TEMP);
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |               newSVpvs_flags("", SVs_TEMP)
./embed.h:468:49: note: expanded from macro 'newSVpvn_flags'
  468 | # define newSVpvn_flags(a,b,c)                  Perl_newSVpvn_flags(aTHX_ a,b,c)
      |                                                 ^
4 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/pp.c
pp.c:3405:26: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 3405 |          SV* const tsv = sv_2mortal(newSVsv(sv));
      |                          ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/toke.c
toke.c:1891:25: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 1891 |             SV *name2 = sv_2mortal(newSVsv(PL_curstname));
      |                         ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/pp_hot.c
pp_hot.c:5498:24: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 5498 |                 TARG = sv_2mortal(newSVsv(TARG));
      |                        ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/mg.c
mg.c:1135:17: warning: sv_setpvn() with literal better written as sv_setpvs() [perl-literal-sv_setpvn]
 1135 |                 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                 sv_setpvs(sv, WARN_NONEstring)
./embed.h:792:49: note: expanded from macro 'sv_setpvn'
  792 | # define sv_setpvn(a,b,c)                       Perl_sv_setpvn(aTHX_ a,b,c)
      |                                                 ^
mg.c:1141:17: warning: sv_setpvn() with literal better written as sv_setpvs() [perl-literal-sv_setpvn]
 1141 |                 sv_setpvn(sv, WARN_ALLstring, WARNsize);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                 sv_setpvs(sv, WARN_ALLstring)
./embed.h:792:49: note: expanded from macro 'sv_setpvn'
  792 | # define sv_setpvn(a,b,c)                       Perl_sv_setpvn(aTHX_ a,b,c)
      |                                                 ^
4 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/op.c
op.c:4065:26: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 4065 |                 svname = sv_2mortal(newSVsv(PL_curstname));
      |                          ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/universalmini.c
universalmini.c:1107:23: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 1107 |             pattern = sv_2mortal(newSVsv(MUTABLE_SV(re)));
      |                       ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/universal.c
universal.c:1107:23: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 1107 |             pattern = sv_2mortal(newSVsv(MUTABLE_SV(re)));
      |                       ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/pp_ctl.c
pp_ctl.c:1444:22: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 1444 |                 sv = sv_2mortal(newSVsv(sv));
      |                      ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
pp_ctl.c:2242:23: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 2242 |                 PUSHs(sv_2mortal(newSVsv(cur_text)));
      |                       ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
pp_ctl.c:2249:13: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 2249 |             mPUSHs(newSVsv(cx->blk_eval.old_namesv));
      |             ^
./pp.h:567:25: note: expanded from macro 'mPUSHs'
  567 | #define mPUSHs(s)       PUSHs(sv_2mortal(s))
      |                               ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
pp_ctl.c:2269:20: warning: newSVpvn() with literal better written as newSVpvs() [perl-literal-newSVpvn]
 2269 |             mask = newSVpvn(WARN_NONEstring, WARNsize) ;
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                    newSVpvs(WARN_NONEstring)
./embed.h:467:49: note: expanded from macro 'newSVpvn'
  467 | # define newSVpvn(a,b)                          Perl_newSVpvn(aTHX_ a,b)
      |                                                 ^
pp_ctl.c:2274:20: warning: newSVpvn() with literal better written as newSVpvs() [perl-literal-newSVpvn]
 2274 |             mask = newSVpvn(WARN_ALLstring, WARNsize) ;
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                    newSVpvs(WARN_ALLstring)
./embed.h:467:49: note: expanded from macro 'newSVpvn'
  467 | # define newSVpvn(a,b)                          Perl_newSVpvn(aTHX_ a,b)
      |                                                 ^
7 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/sv.c
sv.c:6693:23: warning: newSVpvn_flags() with literal better written as newSVpvs_flags() [perl-literal-newSVpvn_flags]
 6693 |                     : newSVpvn_flags( "__ANON__", 8, 0 );
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                       newSVpvs_flags("__ANON__", 0)
./embed.h:468:49: note: expanded from macro 'newSVpvn_flags'
  468 | # define newSVpvn_flags(a,b,c)                  Perl_newSVpvn_flags(aTHX_ a,b,c)
      |                                                 ^
sv.c:17586:18: warning: newSVpvn_flags() with literal better written as newSVpvs_flags() [perl-literal-newSVpvn_flags]
 17586 |             sv = newSVpvn_flags("", 0, SVs_TEMP);
       |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       |                  newSVpvs_flags("", SVs_TEMP)
./embed.h:468:49: note: expanded from macro 'newSVpvn_flags'
  468 | # define newSVpvn_flags(a,b,c)                  Perl_newSVpvn_flags(aTHX_ a,b,c)
      |                                                 ^
4 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/builtin.c
builtin.c:560:9: warning: sv_setsv(..., &PL_sv_undef) better written as sv_set_undef() [perl-undef-sv_setsv]
  560 |         sv_setsv(TARG, &PL_sv_undef);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |         sv_set_undef(TARG)
./embed.h:804:49: note: expanded from macro 'sv_setsv'
  804 | # define sv_setsv(a,b)                          Perl_sv_setsv(aTHX,a,b)
      |                                                 ^
./sv.h:2274:9: note: expanded from macro 'Perl_sv_setsv'
 2274 |         Perl_sv_setsv_flags(aTHX_ dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
      |         ^
builtin.c:576:9: warning: sv_setsv(..., &PL_sv_undef) better written as sv_set_undef() [perl-undef-sv_setsv]
  576 |         sv_setsv(TARG, &PL_sv_undef);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |         sv_set_undef(TARG)
./embed.h:804:49: note: expanded from macro 'sv_setsv'
  804 | # define sv_setsv(a,b)                          Perl_sv_setsv(aTHX,a,b)
      |                                                 ^
./sv.h:2274:9: note: expanded from macro 'Perl_sv_setsv'
 2274 |         Perl_sv_setsv_flags(aTHX_ dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
      |         ^
4 warnings generated.
Suppressed 2 warnings (2 with check filters).
...
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/opmini.c
opmini.c:4065:26: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 4065 |                 svname = sv_2mortal(newSVsv(PL_curstname));
      |                          ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
3 warnings generated.
Suppressed 2 warnings (2 with check filters).
clang-tidy-18 -checks=-*,perl-* -p=/home/tony/dev/perl/git/perl6 -config={"CheckOptions":{"PerlCheckMultiplicity":1}} -load=/home/tony/dev/llvm/git/perl-check/build/libperl-check.so /home/tony/dev/perl/git/perl6/regcomp.c
regcomp.c:809:27: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
  809 |                     pat = sv_2mortal(newSVsv(msv));
      |                           ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
regcomp.c:10711:33: warning: newSVpvn_flags() with literal better written as newSVpvs_flags() [perl-literal-newSVpvn_flags]
 10711 |         SV * substitute_parse = newSVpvn_flags("?:", 2, SVs_TEMP);
       |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       |                                 newSVpvs_flags("?:", SVs_TEMP)
./embed.h:468:49: note: expanded from macro 'newSVpvn_flags'
  468 | # define newSVpvn_flags(a,b,c)                  Perl_newSVpvn_flags(aTHX_ a,b,c)
      |                                                 ^
regcomp.c:16069:19: warning: sv_2mortal(newSVsv(...)) better written as sv_mortalcopy() [perl-mortal-newSVsv]
 16069 |         must_sv = sv_2mortal(newSVsv(must_sv));
       |                   ^
./embed.h:686:49: note: expanded from macro 'sv_2mortal'
  686 | # define sv_2mortal(a)                          Perl_sv_2mortal(aTHX_ a)
      |                                                 ^
5 warnings generated.
Suppressed 2 warnings (2 with check filters).

Checks

perl-literal-sv_setpvn
perl-literal-sv_setpvn_mg
perl-literal-hv_fetch
perl-literal-newSVpvn
perl-literal-newSVpvn_flags
perl-literal-sv_catpvn
perl-literal-sv_catpvn_flags
perl-literal-sv_catpvn_nomg
perl-literal-savepvn
perl-literal-get_cvn_flags

If any of the corresponding API macros is called with a string literal and the length of that literal, suggest the corresponding API that calculates the length automatically.

perl-undef-sv_setsv

Complain about using sv_setsv(sv, &PL_sv_undef) since sv_set_undef(sv) is likely faster.

perl-undef-setpv
perl-undef-setpvn

Complain about sv_setpv(sv, NULL) or sv_setpvn(sv, NULL, 0) to set sv to undef, and suggest/FIXIT sv_set_undef(sv).

perl-mortal-newSVpvn

Check for calls to the given function wrapped by sv_2mortal(), when the wrapped function has a flag to mortalize the result.

perl-mortal-newSVsv

Check for calls to the given function wrapped by sv_2mortal(), when sv_mortalcopy() does the same and mortalizes.

The newSVsv() check does not produce a fix it (I tried, but it wouldn't replace, I suspect the macros confused clang-tidy.)

FixIts

Most checks provide fixits, and clang-tidy can apply the fixes.

Name		Name	Last commit message	Last commit date
Latest commit History 50 Commits
Tests		Tests
.gitignore		.gitignore
.perl-clang-tidy		.perl-clang-tidy
CMakeLists.txt		CMakeLists.txt
PerlCheck.cpp		PerlCheck.cpp
PerlCheck.h		PerlCheck.h
PerlLiteralFunctionCheck.cpp		PerlLiteralFunctionCheck.cpp
PerlLiteralFunctionCheck.h		PerlLiteralFunctionCheck.h
PerlMortalFunctionCheck.cpp		PerlMortalFunctionCheck.cpp
PerlMortalFunctionCheck.h		PerlMortalFunctionCheck.h
PerlUndefSetpvXCheck.cpp		PerlUndefSetpvXCheck.cpp
PerlUndefSetpvXCheck.h		PerlUndefSetpvXCheck.h
PerlUndefSetsvCheck.cpp		PerlUndefSetsvCheck.cpp
PerlUndefSetsvCheck.h		PerlUndefSetsvCheck.h
README.md		README.md
foo.c		foo.c

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