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Debugging with DDD
As yet another alternative, you can select ‘Source ⇒ Breakpoints’. Click on the ‘Break’
button and enter the location.
(If you find this number of alternatives confusing, be aware that ddd users fall into three categories, which must all be supported. Novice users explore ddd and may prefer to use one single
mouse button. Advanced users know how to use shortcuts and prefer popup menus. Experienced
users prefer the command line interface.)
Breakpoints are indicated by a plain stop sign, or as ‘#n’, where n is the breakpoint number. A
greyed out stop sign (or ‘_n_’) indicates a disabled breakpoint. A stop sign with a question mark
(or ‘?n?’) indicates a conditional breakpoint or a breakpoint with an ignore count set.
If you set a breakpoint by mistake, use ‘Edit ⇒ Undo’ to delete it again.
5.1.1.2 Setting Breakpoints by Name
If the function name is visible, click with mouse button 1 on the function name. The function
name is then copied to the argument field. Click on the ‘Break’ button to set a breakpoint there.
As a shorter alternative, you can simply press mouse button 3 on the function name and select
the ‘Break at’ item from the popup menu.
As yet another alternative, you can click on ‘Break...’ from the Breakpoint editor (invoked
through ‘Source ⇒ Breakpoints’) and enter the function name.
5.1.1.3 Setting Regexp Breakpoints
Using gdb, you can also set a breakpoint on all functions that match a given string. ‘Break ⇒
Set Breakpoints at Regexp ()’ sets a breakpoint on all functions whose name matches the
regular expression given in ‘()’. Here are some examples:
• To set a breakpoint on every function that starts with ‘Xm’, set ‘()’ to ‘^Xm’.
• To set a breakpoint on every member of class ‘Date’, set ‘()’ to ‘^Date::’.
• To set a breakpoint on every function whose name contains ‘_fun’, set ‘()’ to ‘_fun’.
• To set a breakpoint on every function that ends in ‘_test’, set ‘()’ to ‘_test$’.
5.1.2 Deleting Breakpoints
To delete a visible breakpoint, click with mouse button 1 on the breakpoint. The breakpoint
location is copied to the argument field. Click on the ‘Clear’ button to delete all breakpoints
there.
If the function name is visible, click with mouse button 1 on the function name. The function
name is copied to the argument field. Click on the ‘Clear’ button to clear all breakpoints there.
As a faster alternative, you can simply press mouse button 3 on the breakpoint and select the
‘Delete Breakpoint’ item from the popup menu.
As yet another alternative, you can select the breakpoint and click on ‘Delete’ in the Breakpoint editor (invoked through ‘Source ⇒ Breakpoints’).
As an even faster alternative, you can simply double-click on the breakpoint while holding hCtrli.