regcomp.c: Revise debugging function

I use this function for debugging, but it is normally commented out.
This commit adds an entry to embed.fnc for it that can quickly be
uncommented, and makes some revisions to the function itself.

diff --git a/embed.fnc b/embed.fnc
index 814495f..8bc67fe 100644 (file)
--- a/embed.fnc
+++ b/embed.fnc
@@ -1424,6 +1424,7 @@ EMiR      |bool   |_invlist_contains_cp|NN SV* const invlist|const UV cp
 EXpMR  |IV     |_invlist_search        |NN SV* const invlist|const UV cp
 EXMpR  |SV*    |_get_swash_invlist|NN SV* const swash
 EXMpR  |HV*    |_swash_inversion_hash  |NN SV* const swash
+: Not used currently: Mp       |void   |_invlist_dump  |NN SV* const invlist|NN const char * const header
 #endif
 Ap     |void   |taint_env
 Ap     |void   |taint_proper   |NULLOK const char* f|NN const char *const s

diff --git a/regcomp.c b/regcomp.c
index 0c62cb0..6d868af 100644 (file)
--- a/regcomp.c
+++ b/regcomp.c
@@ -8252,15 +8252,17 @@ Perl__invlist_contents(pTHX_ SV* const invlist)
 }
 #endif
 
-#if 0
+#ifdef PERL_ARGS_ASSERT__INVLIST_DUMP
 void
-S_invlist_dump(pTHX_ SV* const invlist, const char * const header)
+Perl__invlist_dump(pTHX_ SV* const invlist, const char * const header)
 {
     /* Dumps out the ranges in an inversion list.  The string 'header'
      * if present is output on a line before the first range */
 
     UV start, end;
 
+    PERL_ARGS_ASSERT__INVLIST_DUMP;
+
     if (header && strlen(header)) {
        PerlIO_printf(Perl_debug_log, "%s\n", header);
     }
@@ -8269,8 +8271,12 @@ S_invlist_dump(pTHX_ SV* const invlist, const char * const header)
        if (end == UV_MAX) {
            PerlIO_printf(Perl_debug_log, "0x%04"UVXf" .. INFINITY\n", start);
        }
+       else if (end != start) {
+           PerlIO_printf(Perl_debug_log, "0x%04"UVXf" .. 0x%04"UVXf"\n",
+                                                start,         end);
+       }
        else {
-           PerlIO_printf(Perl_debug_log, "0x%04"UVXf" .. 0x%04"UVXf"\n", start, end);
+           PerlIO_printf(Perl_debug_log, "0x%04"UVXf"\n", start);
        }
     }
 }