2005-02-08 Andrew Cagney <cagney@gnu.org>

[deliverable/binutils-gdb.git] / gdb / exceptions.h

diff --git a/gdb/exceptions.h b/gdb/exceptions.h
index fe19ecdae80978a0cd95141822b59fc0606df4cd..a47742a384f1306003e27165f376e022f12e532e 100644 (file)
--- a/gdb/exceptions.h
+++ b/gdb/exceptions.h
@@ -24,6 +24,10 @@
 #ifndef EXCEPTIONS_H
 #define EXCEPTIONS_H
 
+struct ui_out;
+
+#include <setjmp.h>
+
 /* Reasons for calling throw_exceptions().  NOTE: all reason values
    must be less than zero.  enum value 0 is reserved for internal use
    as the return value from an initial setjmp().  The function
@@ -66,6 +70,59 @@ struct exception
 /* A pre-defined non-exception.  */
 extern const struct exception exception_none;
 
+/* Wrap set/long jmp so that it's more portable (internal to
+   exceptions).  */
+
+#if defined(HAVE_SIGSETJMP)
+#define EXCEPTIONS_SIGJMP_BUF          sigjmp_buf
+#define EXCEPTIONS_SIGSETJMP(buf)      sigsetjmp((buf), 1)
+#define EXCEPTIONS_SIGLONGJMP(buf,val) siglongjmp((buf), (val))
+#else
+#define EXCEPTIONS_SIGJMP_BUF          jmp_buf
+#define EXCEPTIONS_SIGSETJMP(buf)      setjmp(buf)
+#define EXCEPTIONS_SIGLONGJMP(buf,val) longjmp((buf), (val))
+#endif
+
+/* Functions to drive the exceptions state m/c (internal to
+   exceptions).  */
+EXCEPTIONS_SIGJMP_BUF *exceptions_state_mc_init (struct ui_out *func_uiout,
+                                                volatile struct exception *
+                                                exception,
+                                                return_mask mask);
+int exceptions_state_mc_action_iter (void);
+int exceptions_state_mc_action_iter_1 (void);
+
+/* Macro to wrap up standard try/catch behavior.
+
+   The double loop lets us correctly handle code "break"ing out of the
+   try catch block.  (It works as the "break" only exits the inner
+   "while" loop, the outer for loop detects this handling it
+   correctly.)  Of course "return" and "goto" are not so lucky.
+
+   For instance:
+
+   *INDENT-OFF*
+
+   volatile struct exception e;
+   TRY_CATCH (e, RETURN_MASK_ERROR)
+     {
+     }
+   switch (e.reason)
+     {
+     case RETURN_ERROR: ...
+     }
+
+  */
+
+#define TRY_CATCH(EXCEPTION,MASK) \
+    for (EXCEPTIONS_SIGSETJMP \
+           (*exceptions_state_mc_init (uiout, &(EXCEPTION), (MASK))); \
+         exceptions_state_mc_action_iter (); ) \
+      while (exceptions_state_mc_action_iter_1 ())
+
+/* *INDENT-ON* */
+
+
 /* If E is an exception, print it's error message on the specified
    stream. for _fprintf, prefix the message with PREFIX...  */
 extern void exception_print (struct ui_file *file, struct exception e);