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Diffstat (limited to 'gdb/doc/gdb.texinfo')
| -rw-r--r-- | gdb/doc/gdb.texinfo | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 6ac7d16..1daa211 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -3725,6 +3725,18 @@ This command prints a list of watchpoints, using the same format as @code{info break} (@pxref{Set Breaks}). @end table +If you watch for a change in a numerically entered address you need to +dereference it, as the address itself is just a constant number which will +never change. @value{GDBN} refuses to create a watchpoint that watches +a never-changing value: + +@smallexample +(@value{GDBP}) watch 0x600850 +Cannot watch constant value 0x600850. +(@value{GDBP}) watch *(int *) 0x600850 +Watchpoint 1: *(int *) 6293584 +@end smallexample + @value{GDBN} sets a @dfn{hardware watchpoint} if possible. Hardware watchpoints execute very quickly, and the debugger reports a change in value at the exact instruction where the change occurs. If @value{GDBN} |