27.5.4 GDB/MI Breakpoint Information

When GDB reports information about a breakpoint, a tracepoint, a watchpoint, or a catchpoint, it uses a tuple with the following fields:

number

The breakpoint number.

type

The type of the breakpoint. For ordinary breakpoints this will be ‘breakpoint’, but many values are possible.

catch-type

If the type of the breakpoint is ‘catchpoint’, then this indicates the exact type of catchpoint.

disp

This is the breakpoint disposition—either ‘del’, meaning that the breakpoint will be deleted at the next stop, or ‘keep’, meaning that the breakpoint will not be deleted.

enabled

This indicates whether the breakpoint is enabled, in which case the value is ‘y’, or disabled, in which case the value is ‘n’. Note that this is not the same as the field enable.

addr

The address of the breakpoint. This may be a hexidecimal number, giving the address; or the string ‘<PENDING>’, for a pending breakpoint; or the string ‘<MULTIPLE>’, for a breakpoint with multiple locations. This field will not be present if no address can be determined. For example, a watchpoint does not have an address.

addr_flags

Optional field containing any flags related to the address. These flags are architecture-dependent; see Architectures for their meaning for a particular CPU.

func

If known, the function in which the breakpoint appears. If not known, this field is not present.

filename

The name of the source file which contains this function, if known. If not known, this field is not present.

fullname

The full file name of the source file which contains this function, if known. If not known, this field is not present.

line

The line number at which this breakpoint appears, if known. If not known, this field is not present.

at

If the source file is not known, this field may be provided. If provided, this holds the address of the breakpoint, possibly followed by a symbol name.

pending

If this breakpoint is pending, this field is present and holds the text used to set the breakpoint, as entered by the user.

evaluated-by

Where this breakpoint’s condition is evaluated, either ‘host’ or ‘target’.

thread

If this is a thread-specific breakpoint, then this identifies the thread in which the breakpoint can trigger.

task

If this breakpoint is restricted to a particular Ada task, then this field will hold the task identifier.

cond

If the breakpoint is conditional, this is the condition expression.

ignore

The ignore count of the breakpoint.

enable

The enable count of the breakpoint.

traceframe-usage

FIXME.

static-tracepoint-marker-string-id

For a static tracepoint, the name of the static tracepoint marker.

mask

For a masked watchpoint, this is the mask.

pass

A tracepoint’s pass count.

original-location

The location of the breakpoint as originally specified by the user. This field is optional.

times

The number of times the breakpoint has been hit.

installed

This field is only given for tracepoints. This is either ‘y’, meaning that the tracepoint is installed, or ‘n’, meaning that it is not.

what

Some extra data, the exact contents of which are type-dependent.

locations

This field is present if the breakpoint has multiple locations. It is also exceptionally present if the breakpoint is enabled and has a single, disabled location.

The value is a list of locations. The format of a location is described below.

A location in a multi-location breakpoint is represented as a tuple with the following fields:

number

The location number as a dotted pair, like ‘1.2’. The first digit is the number of the parent breakpoint. The second digit is the number of the location within that breakpoint.

enabled

This indicates whether the location is enabled, in which case the value is ‘y’, or disabled, in which case the value is ‘n’. Note that this is not the same as the field enable.

addr

The address of this location as an hexidecimal number.

addr_flags

Optional field containing any flags related to the address. These flags are architecture-dependent; see Architectures for their meaning for a particular CPU.

func

If known, the function in which the location appears. If not known, this field is not present.

file

The name of the source file which contains this location, if known. If not known, this field is not present.

fullname

The full file name of the source file which contains this location, if known. If not known, this field is not present.

line

The line number at which this location appears, if known. If not known, this field is not present.

thread-groups

The thread groups this location is in.

For example, here is what the output of -break-insert (see GDB/MI Breakpoint Commands) might be:

-> -break-insert main
<- ^done,bkpt={number="1",type="breakpoint",disp="keep",
    enabled="y",addr="0x08048564",func="main",file="myprog.c",
    fullname="/home/nickrob/myprog.c",line="68",thread-groups=["i1"],
    times="0"}
<- (gdb)