X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/483ce06a4f6c720f66285117b98747911f62226a..47a0660e68fc38d8d2ff11855d0d5fa5e2af0b82:/XSUB.h

diff --git a/XSUB.h b/XSUB.h
index ca2c297..61d0ef2 100644
--- a/XSUB.h
+++ b/XSUB.h
@@ -48,7 +48,15 @@ Used to access elements on the XSUB's stack.
 
 =for apidoc AmU||XS
 Macro to declare an XSUB and its C parameter list.  This is handled by
-C<xsubpp>.
+C<xsubpp>. It is the same as using the more explicit XS_EXTERNAL macro.
+
+=for apidoc AmU||XS_INTERNAL
+Macro to declare an XSUB and its C parameter list without exporting the symbols.
+This is handled by C<xsubpp> and generally preferable over exporting the XSUB
+symbols unnecessarily.
+
+=for apidoc AmU||XS_EXTERNAL
+Macro to declare an XSUB and its C parameter list explicitly exporting the symbols.
 
 =for apidoc Ams||dAX
 Sets up the C<ax> variable.
@@ -73,7 +81,7 @@ handled automatically by C<xsubpp>.
 
 =for apidoc Ams||dUNDERBAR
 Sets up any variable needed by the C<UNDERBAR> macro. It used to define
-C<padoff_du>, but it is currently a noop. However, it is strongly adviced
+C<padoff_du>, but it is currently a noop. However, it is strongly advised
 to still use it for ensuring past and future compatibility.
 
 =for apidoc AmU||UNDERBAR
@@ -107,27 +115,46 @@ is a lexical $_ in scope.
  * Don't forget to change the __attribute__unused__ version of XS()
  * below too if you change XSPROTO() here.
  */
+
+/* XS_INTERNAL is the explicit static-linkage variant of the default
+ * XS macro.
+ *
+ * XS_EXTERNAL is the same as XS_INTERNAL except it does not include
+ * "STATIC", ie. it exports XSUB symbols. You probably don't want that.
+ */
+
 #define XSPROTO(name) void name(pTHX_ CV* cv)
 
 #undef XS
+#undef XS_EXTERNAL
+#undef XS_INTERNAL
 #if defined(__CYGWIN__) && defined(USE_DYNAMIC_LOADING)
-#  define XS(name) __declspec(dllexport) XSPROTO(name)
+#  define XS_EXTERNAL(name) __declspec(dllexport) XSPROTO(name)
+#  define XS_INTERNAL(name) __declspec(dllexport) STATIC XSPROTO(name)
 #endif
 #if defined(__SYMBIAN32__)
-#  define XS(name) EXPORT_C XSPROTO(name)
+#  define XS_EXTERNAL(name) EXPORT_C XSPROTO(name)
+#  define XS_INTERNAL(name) EXPORT_C STATIC XSPROTO(name)
 #endif
-#ifndef XS
+#ifndef XS_EXTERNAL
 #  if defined(HASATTRIBUTE_UNUSED) && !defined(__cplusplus)
-#    define XS(name) void name(pTHX_ CV* cv __attribute__unused__)
+#    define XS_EXTERNAL(name) void name(pTHX_ CV* cv __attribute__unused__)
+#    define XS_INTERNAL(name) STATIC void name(pTHX_ CV* cv __attribute__unused__)
 #  else
 #    ifdef __cplusplus
-#      define XS(name) extern "C" XSPROTO(name)
+#      define XS_EXTERNAL(name) extern "C" XSPROTO(name)
+#      define XS_INTERNAL(name) static XSPROTO(name)
 #    else
-#      define XS(name) XSPROTO(name)
+#      define XS_EXTERNAL(name) XSPROTO(name)
+#      define XS_INTERNAL(name) STATIC XSPROTO(name)
 #    endif
 #  endif
 #endif
 
+/* We do export xsub symbols by default for the public XS macro.
+ * Try explicitly using XS_INTERNAL/XS_EXTERNAL instead, please. */
+#define XS(name) XS_EXTERNAL(name)
+
 #define dAX const I32 ax = (I32)(MARK - PL_stack_base + 1)
 
 #define dAXMARK				\
@@ -243,6 +270,10 @@ Macro to verify that a PM module's $VERSION variable matches the XS
 module's C<XS_VERSION> variable.  This is usually handled automatically by
 C<xsubpp>.  See L<perlxs/"The VERSIONCHECK: Keyword">.
 
+=for apidoc Ams||XS_APIVERSION_BOOTCHECK
+Macro to verify that the perl api version an XS module has been compiled against
+matches the api version of the perl interpreter it's being loaded into.
+
 =head1 Simple Exception Handling Macros
 
 =for apidoc Ams||dXCPT
@@ -293,36 +324,15 @@ Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
 #define newXSproto(a,b,c,d)	newXS_flags(a,b,c,d,0)
 
 #ifdef XS_VERSION
-#  define XS_VERSION_BOOTCHECK \
-    STMT_START {							\
-	SV *_sv;							\
-	const char *vn = NULL, *module = SvPV_nolen_const(ST(0));	\
-	if (items >= 2)	 /* version supplied as bootstrap arg */	\
-	    _sv = ST(1);						\
-	else {								\
-	    /* XXX GV_ADDWARN */					\
-	    _sv = get_sv(Perl_form(aTHX_ "%s::%s", module,		\
-				vn = "XS_VERSION"), FALSE);		\
-	    if (!_sv || !SvOK(_sv))					\
-		_sv = get_sv(Perl_form(aTHX_ "%s::%s", module,	\
-				    vn = "VERSION"), FALSE);		\
-	}								\
-	if (_sv) {							\
-	    SV *xssv = Perl_newSVpv(aTHX_ XS_VERSION, 0);		\
-	    xssv = new_version(xssv);					\
-	    if ( !sv_derived_from(_sv, "version") )			\
-		_sv = new_version(_sv);				\
-	    if ( vcmp(_sv,xssv) )					\
-		Perl_croak(aTHX_ "%s object version %"SVf" does not match %s%s%s%s %"SVf,\
-		      module, SVfARG(vstringify(xssv)),			\
-		      vn ? "$" : "", vn ? module : "", vn ? "::" : "",	\
-		      vn ? vn : "bootstrap parameter", SVfARG(vstringify(_sv)));\
-	}                                                               \
-    } STMT_END
+#  define XS_VERSION_BOOTCHECK						\
+    Perl_xs_version_bootcheck(aTHX_ items, ax, STR_WITH_LEN(XS_VERSION))
 #else
 #  define XS_VERSION_BOOTCHECK
 #endif
 
+#define XS_APIVERSION_BOOTCHECK						\
+    Perl_xs_apiversion_bootcheck(aTHX_ ST(0), STR_WITH_LEN("v" PERL_API_VERSION_STRING))
+
 #ifdef NO_XSLOCKS
 #  define dXCPT             dJMPENV; int rEtV = 0
 #  define XCPT_TRY_START    JMPENV_PUSH(rEtV); if (rEtV == 0)
@@ -331,9 +341,9 @@ Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
 #  define XCPT_RETHROW      JMPENV_JUMP(rEtV)
 #endif
 
-/* 
-   The DBM_setFilter & DBM_ckFilter macros are only used by 
-   the *DB*_File modules 
+/*
+   The DBM_setFilter & DBM_ckFilter macros are only used by
+   the *DB*_File modules
 */
 
 #define DBM_setFilter(db_type,code)				\
@@ -384,7 +394,6 @@ Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
 #  define VTBL_sv		&PL_vtbl_sv
 #  define VTBL_env		&PL_vtbl_env
 #  define VTBL_envelem		&PL_vtbl_envelem
-#  define VTBL_sig		&PL_vtbl_sig
 #  define VTBL_sigelem		&PL_vtbl_sigelem
 #  define VTBL_pack		&PL_vtbl_pack
 #  define VTBL_packelem		&PL_vtbl_packelem