Add simple exception handling macros for XS writers.

p4raw-id: //depot/perl@23911

1 files changed, 24 insertions, 0 deletions

diff --git a/XSUB.h b/XSUB.h
index 8d8de8d033..6751572c8a 100644
--- a/XSUB.h
+++ b/XSUB.h
@@ -192,6 +192,24 @@ 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">.
 
+=head1 Simple Exception Handling Macros
+
+=for apidoc Ams||dXCPT
+Set up neccessary local variables for exception handling.
+See L<perlguts/"Exception Handling">.
+
+=for apidoc AmU||XCPT_TRY_START
+Starts a try block.  See L<perlguts/"Exception Handling">.
+
+=for apidoc AmU||XCPT_TRY_END
+Ends a try block.  See L<perlguts/"Exception Handling">.
+
+=for apidoc AmU||XCPT_CATCH
+Introduces a catch block.  See L<perlguts/"Exception Handling">.
+
+=for apidoc Ams||XCPT_RETHROW
+Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
+
 =cut
 */
 
@@ -254,6 +272,12 @@ C<xsubpp>.  See L<perlxs/"The VERSIONCHECK: Keyword">.
 #  define XS_VERSION_BOOTCHECK
 #endif
 
+#define dXCPT             dJMPENV; int rEtV = 0
+#define XCPT_TRY_START    JMPENV_PUSH(rEtV); if (rEtV == 0)
+#define XCPT_TRY_END      JMPENV_POP;
+#define XCPT_CATCH        if (rEtV != 0)
+#define XCPT_RETHROW      JMPENV_JUMP(rEtV)
+
 /* 
    The DBM_setFilter & DBM_ckFilter macros are only used by 
    the *DB*_File modules