From: Doug MacEachern <dougm@covalent.net>
Date: Mon, 12 Feb 2001 09:22:45 +0000 (-0800)
Subject: Re: [patch] context for 'U' magic functions
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=24f81a43516329e25358da5cf5b11ee0116287bd;p=p5sagit%2Fp5-mst-13.2.git

Re: [patch] context for 'U' magic functions
Message-ID: <Pine.LNX.4.21.0102120919040.26437-100000@mako.covalent.net>

plus the suggestion by Nick Ing-Simmons to name the macro
as PERL_MG_UFUNC to avoid namespace pollution, plus add
the advice by Doug for XS writers to perl.h

p4raw-id: //depot/perl@8774
---

diff --git a/mg.c b/mg.c
index bb9509a..aa07283 100644
--- a/mg.c
+++ b/mg.c
@@ -796,7 +796,7 @@ Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
     struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
 
     if (uf && uf->uf_val)
-	(*uf->uf_val)(uf->uf_index, sv);
+	(*uf->uf_val)(aTHX_ uf->uf_index, sv);
     return 0;
 }
 
@@ -1667,7 +1667,7 @@ Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
     struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
 
     if (uf && uf->uf_set)
-	(*uf->uf_set)(uf->uf_index, sv);
+	(*uf->uf_set)(aTHX_ uf->uf_index, sv);
     return 0;
 }
 
diff --git a/perl.h b/perl.h
index 498e6e3..df90a65 100644
--- a/perl.h
+++ b/perl.h
@@ -2192,11 +2192,32 @@ Gid_t getegid (void);
 #endif
 
 struct ufuncs {
-    I32 (*uf_val)(IV, SV*);
-    I32 (*uf_set)(IV, SV*);
+    I32 (*uf_val)(pTHX_ IV, SV*);
+    I32 (*uf_set)(pTHX_ IV, SV*);
     IV uf_index;
 };
 
+/* In pre-5.7-Perls the 'U' magic didn't get the thread context.
+ * XS code wanting to be backward compatible can do something
+ * like the following:
+ 
+#ifndef PERL_MG_UFUNC
+/* the old way, without pTHX_ */
+#define PERL_MG_UFUNC(name,ix,sv) I32 name(IV ix, SV *sv)
+#endif
+
+static PERL_MG_UFUNC(foo_get, index, val)
+{
+    sv_setsv(val, ...);
+    return TRUE;
+}
+
+-- Doug MacEachern
+
+*/
+
+#define PERL_MG_UFUNC(name,ix,sv) I32 name(pTHX_ IV ix, SV *sv)
+
 /* Fix these up for __STDC__ */
 #ifndef DONT_DECLARE_STD
 char *mktemp (char*);