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Migrate from devo/gcc/ch.

From-SVN: r22031

gcc/ch/runtime/exh.c

+/* Implement runtime actions for CHILL.
+   Copyright (C) 1992,1993 Free Software Foundation, Inc.
+   Author: Wilfried Moser
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#define __CHILL_LIB__
+
+#include "config.h"
+#include <stdio.h>
+#include <setjmp.h>
+#include "rtltypes.h"
+
+extern void cause_exception (char *exname, char *file, int lineno, int user_arg);
+extern void unhandled_exception (char *exname, char *file, int lineno, int user_arg);
+
+/* An action with a handler:
+	BODY ON (e1, e2): H12; (e3): H3; ELSE HE; END;
+   is translated into:
+
+    struct __ch_handler __tmp;
+    static struct __ch_handler_excepts _H[4] =
+      {
+        { <<e1>>, 1 },
+        { <<e2>>, 1 },
+        { <<e3>>, 2 },
+        { __ch_else_except, 3 },
+      };
+    __ch_link_handler(&__tmp);
+    __tmp.handlers = _H;
+    switch (setmp(&__tmp.jbuf))
+      {	
+      case 0:  BODY; __ch_unlink_handler(&__tmp); break;
+      case 1:  H12; break;
+      case 2:  H3; break;
+      case 3:  HE; break;
+      }
+*/
+
+/* this part contains all neccessary functions to handle exceptions in CHILL */
+
+/* These two trivial function aren't inlines, to allow for
+   more flexibility (e.g. a per-thread exception stack). */
+
+extern void __setexceptionStack (TExceptionHandlerStack *new);
+extern TExceptionHandlerStack * __getexceptionStack (void);
+
+void
+__ch_link_handler (handler)
+     struct __ch_handler *handler;
+{
+  handler->prev = __getexceptionStack ();
+  __setexceptionStack (handler);
+}
+
+ void
+__ch_unlink_handler (handler)
+     struct __ch_handler *handler;
+{
+  __setexceptionStack (handler->prev);
+}
+
+/*
+ * function __cause_exception
+ *
+ * parameters:
+ *  exnum		name string of exception to raise
+ *  file		filename of CAUSE statement
+ *  lineno		linenumber of CAUSE statement
+ *  user_arg		user specified argument
+ *
+ * returns:
+ *  never		leave function with longjmp or abort
+ *
+ * abstract:
+ *  search exceptionstack for last handler of caused exception,
+ *  call userdefined function to signal exception,
+ *  jump to handler with longjmp or call unhandled_exception
+ *
+ */
+
+void
+__cause_exception  (ex, file, lineno, user_arg)
+     char *ex;
+     char *file;
+     int  lineno;
+     int user_arg;
+{
+  register struct __ch_handler *handler = __getexceptionStack();
+
+  /* call user defined cause function */
+  cause_exception (ex, file, lineno, user_arg);
+  
+  for ( ; handler != NULL; handler = handler->prev)
+    {
+      register struct __ch_handled_excepts *list = handler->handlers;
+      for ( ; list->code != 0; list++ )
+	{
+	  if (list->ex == __ch_else_except || EX_EQ(list->ex, ex)) /* found */
+	    {
+	      __setexceptionStack (handler->prev);
+	      longjmp(handler->jbuf, list->code);	  
+	    }
+	}
+    }
+
+  /* no handler found -- call unhandled_exception */
+  unhandled_exception (ex, file, lineno, user_arg);
+  abort ();
+}
+
+/*
+ * function __cause_ex1
+ *
+ * parameters:
+ *  exnum		name string of exception to raise
+ *  file		filename of CAUSE statement
+ *  lineno		linenumber of CAUSE statement
+ *
+ * returns:
+ *  never		leave function with longjmp or abort
+ *
+ * abstract:
+ *  This is the function the compiler generated code calls.
+ *  Search exceptionstack for last handler of caused exception,
+ *  call userdefined function to signal exception,
+ *  jump to handler with longjmp or call unhandled_exception
+ *
+ */
+
+void
+__cause_ex1  (ex, file, lineno)
+     char *ex;
+     char *file;
+     int  lineno;
+{
+  __cause_exception (ex, file, lineno, 0);
+}