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Diffstat (limited to 'gdb/doc/gdbint.texinfo')
| -rw-r--r-- | gdb/doc/gdbint.texinfo | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gdb/doc/gdbint.texinfo b/gdb/doc/gdbint.texinfo index e706caa..c2be3f7 100644 --- a/gdb/doc/gdbint.texinfo +++ b/gdb/doc/gdbint.texinfo @@ -2042,9 +2042,17 @@ address as its caller. On some platforms, a third address is part of the ID to further disambiguate frames---for instance, on IA-64 the separate register stack address is included in the ID. -An invalid frame ID (@code{null_frame_id}) returned from the +An invalid frame ID (@code{outer_frame_id}) returned from the @code{this_id} method means to stop unwinding after this frame. +@code{null_frame_id} is another invalid frame ID which should be used +when there is no frame. For instance, certain breakpoints are attached +to a specific frame, and that frame is identified through its frame ID +(we use this to implement the "finish" command). Using +@code{null_frame_id} as the frame ID for a given breakpoint means +that the breakpoint is not specific to any frame. The @code{this_id} +method should never return @code{null_frame_id}. + @section Unwinding Registers Each unwinder includes a @code{prev_register} method. This method |