perldelta for 343573e55 (the 25-year-old bug)

[perl5.git] / perlvars.h

diff --git a/perlvars.h b/perlvars.h
index f8bb821..7bafa40 100644 (file)
--- a/perlvars.h
+++ b/perlvars.h
@@ -32,7 +32,7 @@ all interpreters and all threads in a process.
 #if defined(USE_ITHREADS)
 PERLVAR(G, op_mutex,   perl_mutex)     /* Mutex for op refcounting */
 #endif
-PERLVAR(G, curinterp,  PerlInterpreter *)
+PERLVARI(G, curinterp, PerlInterpreter *, NULL)
                                        /* currently running interpreter
                                         * (initial parent interpreter under
                                         * useithreads) */
@@ -97,7 +97,7 @@ PERLVAR(G, hints_mutex, perl_mutex)    /* Mutex for refcounted he refcounting */
 #endif
 
 #ifdef DEBUGGING
-PERLVAR(G, watch_pvx,  char *)
+PERLVARI(G, watch_pvx, char *, NULL)
 #endif
 
 /*
@@ -217,7 +217,7 @@ the Perl core) will normally return C<KEYWORD_PLUGIN_DECLINE>.
 
 PERLVARI(G, keyword_plugin, Perl_keyword_plugin_t, Perl_keyword_plugin_standard)
 
-PERLVAR(G, op_sequence, HV *)          /* dump.c */
+PERLVARI(G, op_sequence, HV *, NULL)   /* dump.c */
 PERLVARI(G, op_seq,    UV,     0)      /* dump.c */
 
 #ifdef USE_ITHREADS
@@ -225,7 +225,10 @@ PERLVAR(G, dollarzero_mutex, perl_mutex) /* Modifying $0 */
 #endif
 
 /* Restricted hashes placeholder value.
- * The contents are never used, only the address. */
+   In theory, the contents are never used, only the address.
+   In practice, &PL_sv_placeholder is returned by some APIs, and the calling
+   code is checking SvOK().  */
+
 PERLVAR(G, sv_placeholder, SV)
 
 #if defined(MYMALLOC) && defined(USE_ITHREADS)
@@ -233,4 +236,4 @@ PERLVAR(G, malloc_mutex, perl_mutex)        /* Mutex for malloc */
 #endif
 
 PERLVARI(G, hash_seed_set, bool, FALSE)        /* perl.c */
-PERLVARA(G, hash_seed, PERL_HASH_SEED_BYTES, unsigned char) /* and hv.h */
+PERLVARA(G, hash_seed, PERL_HASH_SEED_BYTES, unsigned char) /* perl.c and hv.h */