- __attribute__format__(__printf__,pTHX_3,pTHX_4);
-
-PERL_CALLCONV void Perl_dump_vindent(pTHX_ I32 level, PerlIO *file, const char* pat, va_list *args);
-PERL_CALLCONV void Perl_do_gv_dump(pTHX_ I32 level, PerlIO *file, const char *name, GV *sv);
-PERL_CALLCONV void Perl_do_gvgv_dump(pTHX_ I32 level, PerlIO *file, const char *name, GV *sv);
-PERL_CALLCONV void Perl_do_hv_dump(pTHX_ I32 level, PerlIO *file, const char *name, HV *sv);
-PERL_CALLCONV void Perl_do_magic_dump(pTHX_ I32 level, PerlIO *file, const MAGIC *mg, I32 nest, I32 maxnest, bool dumpops, STRLEN pvlim);
-PERL_CALLCONV void Perl_do_op_dump(pTHX_ I32 level, PerlIO *file, const OP *o);
-PERL_CALLCONV void Perl_do_pmop_dump(pTHX_ I32 level, PerlIO *file, const PMOP *pm);
-PERL_CALLCONV void Perl_do_sv_dump(pTHX_ I32 level, PerlIO *file, SV *sv, I32 nest, I32 maxnest, bool dumpops, STRLEN pvlim);
+ __attribute__format__(__printf__,pTHX_3,pTHX_4)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_dump_vindent(pTHX_ I32 level, PerlIO *file, const char* pat, va_list *args)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_gv_dump(pTHX_ I32 level, PerlIO *file, const char *name, GV *sv)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_gvgv_dump(pTHX_ I32 level, PerlIO *file, const char *name, GV *sv)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_hv_dump(pTHX_ I32 level, PerlIO *file, const char *name, HV *sv)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_magic_dump(pTHX_ I32 level, PerlIO *file, const MAGIC *mg, I32 nest, I32 maxnest, bool dumpops, STRLEN pvlim)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_op_dump(pTHX_ I32 level, PerlIO *file, const OP *o)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_pmop_dump(pTHX_ I32 level, PerlIO *file, const PMOP *pm)
+ __attribute__nonnull__(pTHX_2);
+
+PERL_CALLCONV void Perl_do_sv_dump(pTHX_ I32 level, PerlIO *file, SV *sv, I32 nest, I32 maxnest, bool dumpops, STRLEN pvlim)
+ __attribute__nonnull__(pTHX_2);
+