* i386-tdep.c (i386_frame_prev_register): Unwind SP from memory

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

diff --git a/gdb/frame.h b/gdb/frame.h
index 25f20a944f7500ca36b396d02406037cc1818786..a2052c030d732b76f9e58eda1e77fe461f96550c 100644 (file)
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -457,12 +457,19 @@ enum unwind_stop_reason
        error.  But that's a project for another day.  */
     UNWIND_NULL_ID,
 
+    /* This frame is the outermost.  */
+    UNWIND_OUTERMOST,
+
     /* All the conditions after this point are considered errors;
        abnormal stack termination.  If a backtrace stops for one
        of these reasons, we'll let the user know.  This marker
        is not a valid stop reason.  */
     UNWIND_FIRST_ERROR,
 
+    /* Can't unwind further, because that would require knowing the
+       values of registers or memory that haven't been collected.  */
+    UNWIND_UNAVAILABLE,
+
     /* This frame ID looks like it ought to belong to a NEXT frame,
        but we got it for a PREV frame.  Normally, this is a sign of
        unwinder failure.  It could also indicate stack corruption.  */
@@ -562,6 +569,14 @@ extern void put_frame_register_bytes (struct frame_info *frame, int regnum,
 
 extern CORE_ADDR frame_unwind_caller_pc (struct frame_info *frame);
 
+/* Same as frame_unwind_caller_pc, but returns a boolean indication of
+   whether the caller PC is determinable (when the PC is unavailable,
+   it will not be), instead of possibly throwing an error trying to
+   read unavailable memory or registers.  */
+
+extern int frame_unwind_caller_pc_if_available (struct frame_info *this_frame,
+                                               CORE_ADDR *pc);
+
 /* Discard the specified frame.  Restoring the registers to the state
    of the caller.  */
 extern void frame_pop (struct frame_info *frame);