Info: (gdb) Breakpoints

gdb: Breakpoints

 
 5.1 Breakpoints, Watchpoints, and Catchpoints
 =============================================
 
 A "breakpoint" makes your program stop whenever a certain point in the
 program is reached.  For each breakpoint, you can add conditions to
 control in finer detail whether your program stops.  You can set
 breakpoints with the 'break' command and its variants (Setting
 Breakpoints Set Breaks.), to specify the place where your program
 should stop by line number, function name or exact address in the
 program.
 
    On some systems, you can set breakpoints in shared libraries before
 the executable is run.
 
    A "watchpoint" is a special breakpoint that stops your program when
 the value of an expression changes.  The expression may be a value of a
 variable, or it could involve values of one or more variables combined
 by operators, such as 'a + b'.  This is sometimes called "data
 breakpoints".  You must use a different command to set watchpoints
 (Setting Watchpoints Set Watchpoints.), but aside from that, you
 can manage a watchpoint like any other breakpoint: you enable, disable,
 and delete both breakpoints and watchpoints using the same commands.
 
    You can arrange to have values from your program displayed
 automatically whenever GDB stops at a breakpoint.  Automatic
 Display Auto Display.
 
    A "catchpoint" is another special breakpoint that stops your program
 when a certain kind of event occurs, such as the throwing of a C++
 exception or the loading of a library.  As with watchpoints, you use a
 different command to set a catchpoint (Setting Catchpoints Set
 Catchpoints.), but aside from that, you can manage a catchpoint like any
 other breakpoint.  (To stop when your program receives a signal, use the
 'handle' command; see Signals Signals.)
 
    GDB assigns a number to each breakpoint, watchpoint, or catchpoint
 when you create it; these numbers are successive integers starting with
 one.  In many of the commands for controlling various features of
 breakpoints you use the breakpoint number to say which breakpoint you
 want to change.  Each breakpoint may be "enabled" or "disabled"; if
 disabled, it has no effect on your program until you enable it again.
 
    Some GDB commands accept a space-separated list of breakpoints on
 which to operate.  A list element can be either a single breakpoint
 number, like '5', or a range of such numbers, like '5-7'.  When a
 breakpoint list is given to a command, all breakpoints in that list are
 operated on.

 
· Set Breaks                  Setting breakpoints
· Set Watchpoints             Setting watchpoints
· Set Catchpoints             Setting catchpoints
· Delete Breaks               Deleting breakpoints
· Disabling                   Disabling breakpoints
· Conditions                  Break conditions
· Break Commands              Breakpoint command lists
· Dynamic Printf              Dynamic printf
· Save Breakpoints            How to save breakpoints in a file
· Static Probe Points         Listing static probe points
· Error in Breakpoints        "Cannot insert breakpoints"
· Breakpoint-related Warnings "Breakpoint address adjusted..."

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gdb: Stopping

gdb: Continuing and Stepping

gdb: Breakpoints

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