gdb.info: GDB/MI Breakpoint Table Commands

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GDB/MI Breakpoint table commands

This section documents GDB/MI commands for manipulating breakpoints.

The `-break-after' Command

Synopsis

      -break-after NUMBER COUNT
   The breakpoint number NUMBER is not in effect until it has been hit
COUNT times.  To see how this is reflected in the output of the
`-break-list' command, see the description of the `-break-list' command
below.

GDB Command

The corresponding GDB command is `ignore'.

Example

     (gdb)
     -break-insert main
     ^done,bkpt={number="1",addr="0x000100d0",file="hello.c",line="5"}
     (gdb)
     -break-after 1 3
     ~
     ^done
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="1",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x000100d0",func="main",file="hello.c",line="5",times="0",
     ignore="3"}]}
     (gdb)

The `-break-condition' Command

Synopsis

      -break-condition NUMBER EXPR
   Breakpoint NUMBER will stop the program only if the condition in
EXPR is true.  The condition becomes part of the `-break-list' output
(see the description of the `-break-list' command below).

GDB Command

The corresponding GDB command is `condition'.

Example

     (gdb)
     -break-condition 1 1
     ^done
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="1",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x000100d0",func="main",file="hello.c",line="5",cond="1",
     times="0",ignore="3"}]}
     (gdb)

The `-break-delete' Command

Synopsis

      -break-delete ( BREAKPOINT )+
   Delete the breakpoint(s) whose number(s) are specified in the
argument list.  This is obviously reflected in the breakpoint list.

GDB command

The corresponding GDB command is `delete'.

Example

     (gdb)
     -break-delete 1
     ^done
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="0",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[]}
     (gdb)

The `-break-disable' Command

Synopsis

      -break-disable ( BREAKPOINT )+
   Disable the named BREAKPOINT(s).  The field `enabled' in the break
list is now set to `n' for the named BREAKPOINT(s).

GDB Command

The corresponding GDB command is `disable'.

Example

     (gdb)
     -break-disable 2
     ^done
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="1",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="2",type="breakpoint",disp="keep",enabled="n",
     addr="0x000100d0",func="main",file="hello.c",line="5",times="0"}]}
     (gdb)

The `-break-enable' Command

Synopsis

      -break-enable ( BREAKPOINT )+
   Enable (previously disabled) BREAKPOINT(s).

GDB Command

The corresponding GDB command is `enable'.

Example

     (gdb)
     -break-enable 2
     ^done
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="1",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="2",type="breakpoint",disp="keep",enabled="y",
     addr="0x000100d0",func="main",file="hello.c",line="5",times="0"}]}
     (gdb)

The `-break-info' Command

Synopsis

      -break-info BREAKPOINT
   Get information about a single breakpoint.

GDB command

The corresponding GDB command is `info break BREAKPOINT'.

Example

N.A.

The `-break-insert' Command

Synopsis

      -break-insert [ -t ] [ -h ] [ -r ]
         [ -c CONDITION ] [ -i IGNORE-COUNT ]
         [ -p THREAD ] [ LINE | ADDR ]
If specified, LINE, can be one of:
   * function
   * filename:linenum
   * filename:function
   * *address
   The possible optional parameters of this command are:
`-t'
     Insert a tempoary breakpoint.
`-h'
     Insert a hardware breakpoint.
`-c CONDITION'
     Make the breakpoint conditional on CONDITION.
`-i IGNORE-COUNT'
     Initialize the IGNORE-COUNT.
`-r'
     Insert a regular breakpoint in all the functions whose names match
     the given regular expression.  Other flags are not applicable to
     regular expresson.

Result

The result is in the form:
      ^done,bkptno="NUMBER",func="FUNCNAME",
       file="FILENAME",line="LINENO"
where NUMBER is the GDB number for this breakpoint, FUNCNAME is the
name of the function where the breakpoint was inserted, FILENAME is the
name of the source file which contains this function, and LINENO is the
source line number within that file.
   Note: this format is open to change.

GDB Command

The corresponding GDB commands are `break', `tbreak', `hbreak',
`thbreak', and `rbreak'.

Example

     (gdb)
     -break-insert main
     ^done,bkpt={number="1",addr="0x0001072c",file="recursive2.c",line="4"}
     (gdb)
     -break-insert -t foo
     ^done,bkpt={number="2",addr="0x00010774",file="recursive2.c",line="11"}
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="2",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x0001072c", func="main",file="recursive2.c",line="4",times="0"},
     bkpt={number="2",type="breakpoint",disp="del",enabled="y",
     addr="0x00010774",func="foo",file="recursive2.c",line="11",times="0"}]}
     (gdb)
     -break-insert -r foo.*
     ~int foo(int, int);
     ^done,bkpt={number="3",addr="0x00010774",file="recursive2.c",line="11"}
     (gdb)

The `-break-list' Command

Synopsis

      -break-list
   Displays the list of inserted breakpoints, showing the following
fields:
`Number'
     number of the breakpoint
`Type'
     type of the breakpoint: `breakpoint' or `watchpoint'
`Disposition'
     should the breakpoint be deleted or disabled when it is hit: `keep'
     or `nokeep'
`Enabled'
     is the breakpoint enabled or no: `y' or `n'
`Address'
     memory location at which the breakpoint is set
`What'
     logical location of the breakpoint, expressed by function name,
     file name, line number
`Times'
     number of times the breakpoint has been hit
   If there are no breakpoints or watchpoints, the `BreakpointTable'
`body' field is an empty list.

GDB Command

The corresponding GDB command is `info break'.

Example

     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="2",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x000100d0",func="main",file="hello.c",line="5",times="0"},
     bkpt={number="2",type="breakpoint",disp="keep",enabled="y",
     addr="0x00010114",func="foo",file="hello.c",line="13",times="0"}]}
     (gdb)
   Here's an example of the result when there are no breakpoints:
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="0",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[]}
     (gdb)

The `-break-watch' Command

Synopsis

-break-watch [ -a | -r ]

   Create a watchpoint.  With the `-a' option it will create an
"access" watchpoint, i.e. a watchpoint that triggers either on a read
from or on a write to the memory location.  With the `-r' option, the
watchpoint created is a "read" watchpoint, i.e. it will trigger only
when the memory location is accessed for reading.  Without either of
the options, the watchpoint created is a regular watchpoint, i.e. it
will trigger when the memory location is accessed for writing.  *Note
Setting watchpoints: Set Watchpoints.
   Note that `-break-list' will report a single list of watchpoints and
breakpoints inserted.

GDB Command

The corresponding GDB commands are `watch', `awatch', and `rwatch'.

Example

Setting a watchpoint on a variable in the `main' function:
     (gdb)
     -break-watch x
     ^done,wpt={number="2",exp="x"}
     (gdb)
     -exec-continue
     ^running
     ^done,reason="watchpoint-trigger",wpt={number="2",exp="x"},
     value={old="-268439212",new="55"},
     frame={func="main",args=[],file="recursive2.c",line="5"}
     (gdb)
   Setting a watchpoint on a variable local to a function.  GDB will
stop the program execution twice: first for the variable changing
value, then for the watchpoint going out of scope.
     (gdb)
     -break-watch C
     ^done,wpt={number="5",exp="C"}
     (gdb)
     -exec-continue
     ^running
     ^done,reason="watchpoint-trigger",
     wpt={number="5",exp="C"},value={old="-276895068",new="3"},
     frame={func="callee4",args=[],
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="13"}
     (gdb)
     -exec-continue
     ^running
     ^done,reason="watchpoint-scope",wpnum="5",
     frame={func="callee3",args=[{name="strarg",
     value="0x11940 \"A string argument.\""}],
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="18"}
     (gdb)
   Listing breakpoints and watchpoints, at different points in the
program execution.  Note that once the watchpoint goes out of scope, it
is deleted.
     (gdb)
     -break-watch C
     ^done,wpt={number="2",exp="C"}
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="2",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x00010734",func="callee4",
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8",times="1"},
     bkpt={number="2",type="watchpoint",disp="keep",
     enabled="y",addr="",what="C",times="0"}]}
     (gdb)
     -exec-continue
     ^running
     ^done,reason="watchpoint-trigger",wpt={number="2",exp="C"},
     value={old="-276895068",new="3"},
     frame={func="callee4",args=[],
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="13"}
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="2",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x00010734",func="callee4",
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8",times="1"},
     bkpt={number="2",type="watchpoint",disp="keep",
     enabled="y",addr="",what="C",times="-5"}]}
     (gdb)
     -exec-continue
     ^running
     ^done,reason="watchpoint-scope",wpnum="2",
     frame={func="callee3",args=[{name="strarg",
     value="0x11940 \"A string argument.\""}],
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="18"}
     (gdb)
     -break-list
     ^done,BreakpointTable={nr_rows="1",nr_cols="6",
     hdr=[{width="3",alignment="-1",col_name="number",colhdr="Num"},
     {width="14",alignment="-1",col_name="type",colhdr="Type"},
     {width="4",alignment="-1",col_name="disp",colhdr="Disp"},
     {width="3",alignment="-1",col_name="enabled",colhdr="Enb"},
     {width="10",alignment="-1",col_name="addr",colhdr="Address"},
     {width="40",alignment="2",col_name="what",colhdr="What"}],
     body=[bkpt={number="1",type="breakpoint",disp="keep",enabled="y",
     addr="0x00010734",func="callee4",
     file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8",times="1"}]}
     (gdb)