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-rw-r--r--XSUB.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/XSUB.h b/XSUB.h
index b4c241aa3e..a1e48dd47c 100644
--- a/XSUB.h
+++ b/XSUB.h
@@ -67,6 +67,14 @@ This is usually handled automatically by C<xsubpp>.
Sets up the C<ix> variable for an XSUB which has aliases. This is usually
handled automatically by C<xsubpp>.
+=for apidoc Ams||dUNDERBAR
+Sets up the C<padoff_du> variable for an XSUB that wishes to use
+C<UNDERBAR>.
+
+=for apidoc AmU||UNDERBAR
+The SV* corresponding to the $_ variable. Works even if there
+is a lexical $_ in scope.
+
=cut
*/
@@ -106,6 +114,11 @@ handled automatically by C<xsubpp>.
#define XSINTERFACE_FUNC_SET(cv,f) \
CvXSUBANY(cv).any_dxptr = (void (*) (pTHX_ void*))(f)
+#define dUNDERBAR I32 padoff_du = pad_findmy("$_")
+#define UNDERBAR ((padoff_du == NOT_IN_PAD \
+ || PAD_COMPNAME_FLAGS(padoff_du) & SVpad_OUR) \
+ ? DEFSV : PAD_SVl(padoff_du))
+
/* Simple macros to put new mortal values onto the stack. */
/* Typically used to return values from XS functions. */