Use perl -MO=Concise,-exec -e'...code...' to find the name of the operators into which your code compiles. Then grep the Perl source for pp_name.

For example, you asked about reverse. 

$ perl -MO=Concise,-exec -e'@b = reverse @a'
1  <0> enter
2  <;> nextstate(main 1 -e:1) v:{
3  <0> pushmark s
4  <0> pushmark s
5  <#> gv[*a] s
6  <1> rv2av[t4] lK/1
7  <@> reverse[t5] lK/1             <-----------
8  <0> pushmark s
9  <#> gv[*b] s
a  <1> rv2av[t2] lKRM*/1
b  <2> aassign[t6] vKS
c  <@> leave[1 ref] vKP/REFC
-e syntax OK

$ grep -nR pp_reverse .
./lib/B/Deparse.pm:3130:sub pp_reverse { listop(@_, "reverse") }
./opcode.h:1143:        Perl_pp_reverse,
./pp.c:5508:PP(pp_reverse)          <-----------
./pp_proto.h:215:PERL_CALLCONV OP *Perl_pp_reverse(pTHX);

$ perl -ne'print if 5508 .. /^}/' pp.c
PP(pp_reverse)
{
    dSP; dMARK;
...
    RETURN;
}

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In reply to Re: Perl built-in functions source code by ikegami
in thread Perl built-in functions source code by prat7434

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