fixup to free_and_set_cop_warnings()

v5.31.9-156-g94c8b9c1f0 introduced the free_and_set_cop_warnings()
macro. It's first argument expects a COP rather than a COP*. Its usage
in S_restore_cop_warnings(() is to modify PL_cucop, but in order to pass
a COP rather than a COP*, the original commit made a local copy of
PL_curcop and ended up inadvertently updating the copy instead.

This commit changes the maco so it expects a COP*, and updates the bulk
of its callers to use &PL_compiling rather than PL_compiling, and fixes
up S_restore_cop_warnings().

The symptoms were ASAN failures in a few test scripts including
uni/parser.t and ext/XS-APItest/t/handy0*.t.

(The S_restore_cop_warnings() function was only used by
Perl__force_out_malformed_utf8_message(), so didn't cause many issues
outside of test scripts which forced such "malformed "errors).

6 files changed, 12 insertions, 13 deletions

diff --git a/mg.c b/mg.c
index b21f4d3c2b..e603b60989 100644
--- a/mg.c
+++ b/mg.c
@@ -2966,7 +2966,7 @@ Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
 	else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
 	    if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
 		if (!SvPOK(sv)) {
-            free_and_set_cop_warnings(PL_compiling, pWARN_STD);
+            free_and_set_cop_warnings(&PL_compiling, pWARN_STD);
 		    break;
 		}
 		{
@@ -2978,9 +2978,9 @@ Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
 			not_all |= ptr[i] ^ 0x55;
 		    }
 		    if (!not_none) {
-                free_and_set_cop_warnings(PL_compiling, pWARN_NONE);
+                free_and_set_cop_warnings(&PL_compiling, pWARN_NONE);
 		    } else if (len >= WARNsize && !not_all) {
-                free_and_set_cop_warnings(PL_compiling, pWARN_ALL);
+                free_and_set_cop_warnings(&PL_compiling, pWARN_ALL);
 	            PL_dowarn |= G_WARN_ONCE ;
 	        }
             else {
diff --git a/perl.c b/perl.c
index fdfd1cd8d8..9d1faf44da 100644
--- a/perl.c
+++ b/perl.c
@@ -1245,7 +1245,7 @@ perl_destruct(pTHXx)
         }
     }
 
-    free_and_set_cop_warnings(PL_compiling, NULL);
+    free_and_set_cop_warnings(&PL_compiling, NULL);
     cophh_free(CopHINTHASH_get(&PL_compiling));
     CopHINTHASH_set(&PL_compiling, cophh_new_empty());
     CopFILE_free(&PL_compiling);
@@ -3738,12 +3738,12 @@ Perl_moreswitches(pTHX_ const char *s)
 	return s;
     case 'W':
 	PL_dowarn = G_WARN_ALL_ON|G_WARN_ON;
-    free_and_set_cop_warnings(PL_compiling, pWARN_ALL);
+    free_and_set_cop_warnings(&PL_compiling, pWARN_ALL);
 	s++;
 	return s;
     case 'X':
 	PL_dowarn = G_WARN_ALL_OFF;
-    free_and_set_cop_warnings(PL_compiling, pWARN_NONE);
+    free_and_set_cop_warnings(&PL_compiling, pWARN_NONE);
 	s++;
 	return s;
     case '*':
diff --git a/regen/warnings.pl b/regen/warnings.pl
index a73ca9e3bb..6000c759ef 100644
--- a/regen/warnings.pl
+++ b/regen/warnings.pl
@@ -393,8 +393,8 @@ EOM
 #define DUP_WARNINGS(p) Perl_dup_warnings(aTHX_ p)
 
 #define free_and_set_cop_warnings(cmp,w) STMT_START { \
-  if (!specialWARN(cmp.cop_warnings)) PerlMemShared_free(cmp.cop_warnings); \
-  cmp.cop_warnings = w; \
+  if (!specialWARN((cmp)->cop_warnings)) PerlMemShared_free((cmp)->cop_warnings); \
+  (cmp)->cop_warnings = w; \
 } STMT_END
 
 /*
diff --git a/scope.c b/scope.c
index ad8f8e764b..a948a7b4f2 100644
--- a/scope.c
+++ b/scope.c
@@ -1448,7 +1448,7 @@ Perl_leave_scope(pTHX_ I32 base)
 
 	case SAVEt_COMPILE_WARNINGS:
             a0 = ap[0];
-        free_and_set_cop_warnings(PL_compiling, (STRLEN*) a0.any_ptr);
+        free_and_set_cop_warnings(&PL_compiling, (STRLEN*) a0.any_ptr);
 	    break;
 
 	case SAVEt_PARSER:
diff --git a/utf8.c b/utf8.c
index ac075077b4..2b30cad117 100644
--- a/utf8.c
+++ b/utf8.c
@@ -55,8 +55,7 @@ within non-zero characters.
 static void
 S_restore_cop_warnings(pTHX_ void *p)
 {
-    COP curcop = *PL_curcop;
-    free_and_set_cop_warnings(curcop, (STRLEN*) p);
+    free_and_set_cop_warnings(PL_curcop, (STRLEN*) p);
 }
 
 
diff --git a/warnings.h b/warnings.h
index 37ab2055fc..f02edea0fa 100644
--- a/warnings.h
+++ b/warnings.h
@@ -226,8 +226,8 @@
 #define DUP_WARNINGS(p) Perl_dup_warnings(aTHX_ p)
 
 #define free_and_set_cop_warnings(cmp,w) STMT_START { \
-  if (!specialWARN(cmp.cop_warnings)) PerlMemShared_free(cmp.cop_warnings); \
-  cmp.cop_warnings = w; \
+  if (!specialWARN((cmp)->cop_warnings)) PerlMemShared_free((cmp)->cop_warnings); \
+  (cmp)->cop_warnings = w; \
 } STMT_END
 
 /*