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* gdb.texinfo (Breakpoint Menus): Delete. Contents moved inside 

new node "Ambiguous Expressions".  Replace references to this
        node by references to "Ambiguous Expressions" throughout.
        (Ambiguous Expressions): New node.
This commit is contained in:
Joel Brobecker 2008-04-03 21:51:12 +00:00
parent eae06beb6d
commit 6ba66d6a97
2 changed files with 96 additions and 51 deletions
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7
gdb/doc/ChangeLog
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@ -1,3 +1,10 @@
2008-04-03 Joel Brobecker <brobecker@adacore.com>
* gdb.texinfo (Breakpoint Menus): Delete. Contents moved inside
new node "Ambiguous Expressions". Replace references to this
node by references to "Ambiguous Expressions" throughout.
(Ambiguous Expressions): New node.
2008-03-26 Daniel Jacobowitz <dan@codesourcery.com>
* gdb.texinfo (MIPS Features, PowerPC Features): Add @node.

140
gdb/doc/gdb.texinfo
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@ -2877,7 +2877,6 @@ all breakpoints in that range are operated on.
* Disabling:: Disabling breakpoints
* Conditions:: Break conditions
* Break Commands:: Breakpoint command lists
* Breakpoint Menus:: Breakpoint menus
* Error in Breakpoints:: ``Cannot insert breakpoints''
* Breakpoint-related Warnings:: ``Breakpoint address adjusted...''
@end menu
@ -2910,7 +2909,8 @@ before it executes any of the code in the specified @var{location}.
When using source languages that permit overloading of symbols, such as
C@t{++}, a function name may refer to more than one possible place to break.
@xref{Breakpoint Menus,,Breakpoint Menus}, for a discussion of that situation.
@xref{Ambiguous Expressions,,Ambiguous Expressions}, for a discussion of
that situation.
@item break
When called without any arguments, @code{break} sets a breakpoint at
@ -3857,53 +3857,6 @@ cont
end
@end smallexample
@node Breakpoint Menus
@subsection Breakpoint Menus
@cindex overloading
@cindex symbol overloading
Some programming languages (notably C@t{++} and Objective-C) permit a
single function name
to be defined several times, for application in different contexts.
This is called @dfn{overloading}. When a function name is overloaded,
@samp{break @var{function}} is not enough to tell @value{GDBN} where you want
a breakpoint. You can use explicit signature of the function, as in
@samp{break @var{function}(@var{types})}, to specify which
particular version of the function you want. Otherwise, @value{GDBN} offers
you a menu of numbered choices for different possible breakpoints, and
waits for your selection with the prompt @samp{>}. The first two
options are always @samp{[0] cancel} and @samp{[1] all}. Typing @kbd{1}
sets a breakpoint at each definition of @var{function}, and typing
@kbd{0} aborts the @code{break} command without setting any new
breakpoints.
For example, the following session excerpt shows an attempt to set a
breakpoint at the overloaded symbol @code{String::after}.
We choose three particular definitions of that function name:
@c FIXME! This is likely to change to show arg type lists, at least
@smallexample
@group
(@value{GDBP}) b String::after
[0] cancel
[1] all
[2] file:String.cc; line number:867
[3] file:String.cc; line number:860
[4] file:String.cc; line number:875
[5] file:String.cc; line number:853
[6] file:String.cc; line number:846
[7] file:String.cc; line number:735
> 2 4 6
Breakpoint 1 at 0xb26c: file String.cc, line 867.
Breakpoint 2 at 0xb344: file String.cc, line 875.
Breakpoint 3 at 0xafcc: file String.cc, line 846.
Multiple breakpoints were set.
Use the "delete" command to delete unwanted
breakpoints.
(@value{GDBP})
@end group
@end smallexample
@c @ifclear BARETARGET
@node Error in Breakpoints
@subsection ``Cannot insert breakpoints''
@ -5562,6 +5515,7 @@ Table}.
@menu
* Expressions:: Expressions
* Ambiguous Expressions:: Ambiguous Expressions
* Variables:: Program variables
* Arrays:: Artificial arrays
* Output Formats:: Output formats
@ -5640,6 +5594,89 @@ a cast). This construct is allowed regardless of what kind of data is
normally supposed to reside at @var{addr}.
@end table
@node Ambiguous Expressions
@section Ambiguous Expressions
@cindex ambiguous expressions
Expressions can sometimes contain some ambiguous elements. For instance,
some programming languages (notably Ada, C@t{++} and Objective-C) permit
a single function name to be defined several times, for application in
different contexts. This is called @dfn{overloading}. Another example
involving Ada is generics. A @dfn{generic package} is similar to C@t{++}
templates and is typically instantiated several times, resulting in
the same function name being defined in different contexts.
In some cases and depending on the language, it is possible to adjust
the expression to remove the ambiguity. For instance in C@t{++}, you
can specify the signature of the function you want to break on, as in
@kbd{break @var{function}(@var{types})}. In Ada, using the fully
qualified name of your function often makes the expression unambiguous
as well.
When an ambiguity that needs to be resolved is detected, the debugger
has the capability to display a menu of numbered choices for each
possibility, and then waits for the selection with the prompt @samp{>}.
The first option is always @samp{[0] cancel}, and typing @kbd{0 @key{RET}}
aborts the current command. If the command in which the expression was
used allows more than one choice to be selected, the next option in the
menu is @samp{[1] all}, and typing @kbd{1 @key{RET}} selects all possible
choices.
For example, the following session excerpt shows an attempt to set a
breakpoint at the overloaded symbol @code{String::after}.
We choose three particular definitions of that function name:
@c FIXME! This is likely to change to show arg type lists, at least
@smallexample
@group
(@value{GDBP}) b String::after
[0] cancel
[1] all
[2] file:String.cc; line number:867
[3] file:String.cc; line number:860
[4] file:String.cc; line number:875
[5] file:String.cc; line number:853
[6] file:String.cc; line number:846
[7] file:String.cc; line number:735
> 2 4 6
Breakpoint 1 at 0xb26c: file String.cc, line 867.
Breakpoint 2 at 0xb344: file String.cc, line 875.
Breakpoint 3 at 0xafcc: file String.cc, line 846.
Multiple breakpoints were set.
Use the "delete" command to delete unwanted
breakpoints.
(@value{GDBP})
@end group
@end smallexample
@table @code
@kindex set multiple-symbols
@item set multiple-symbols @var{mode}
@cindex multiple-symbols menu
This option allows you to adjust the debugger behavior when an expression
is ambiguous.
By default, @var{mode} is set to @code{all}. If the command with which
the expression is used allows more than one choice, then @value{GDBN}
automatically selects all possible choices. For instance, inserting
a breakpoint on a function using an ambiguous name results in a breakpoint
inserted on each possible match. However, if a unique choice must be made,
then @value{GDBN} uses the menu to help you disambiguate the expression.
For instance, printing the address of an overloaded function will result
in the use of the menu.
When @var{mode} is set to @code{ask}, the debugger always uses the menu
when an ambiguity is detected.
Finally, when @var{mode} is set to @code{cancel}, the debugger reports
an error due to the ambiguity and the command is aborted.
@kindex show multiple-symbols
@item show multiple-symbols
Show the current value of the @code{multiple-symbols} setting.
@end table
@node Variables
@section Program Variables
@ -9621,8 +9658,9 @@ designed specifically for use with C@t{++}. Here is a summary:
@cindex break in overloaded functions
@item @r{breakpoint menus}
When you want a breakpoint in a function whose name is overloaded,
@value{GDBN} breakpoint menus help you specify which function definition
you want. @xref{Breakpoint Menus,,Breakpoint Menus}.
@value{GDBN} has the capability to display a menu of possible breakpoint
locations to help you specify which function definition you want.
@xref{Ambiguous Expressions,,Ambiguous Expressions}.
@cindex overloading in C@t{++}
@item rbreak @var{regex}