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Debugging with GDB

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24.9 GDB/MI Stack Manipulation Commands

The -stack-info-frame Command

Synopsis

 
 -stack-info-frame

Get info on the current frame.

GDB Command

The corresponding GDB command is `info frame' or `frame' (without arguments).

Example

N.A.

The -stack-info-depth Command

Synopsis

 
 -stack-info-depth [ max-depth ]

Return the depth of the stack. If the integer argument max-depth is specified, do not count beyond max-depth frames.

GDB Command

There's no equivalent GDB command.

Example

For a stack with frame levels 0 through 11:

 
(gdb)
-stack-info-depth
^done,depth="12"
(gdb)
-stack-info-depth 4
^done,depth="4"
(gdb)
-stack-info-depth 12
^done,depth="12"
(gdb)
-stack-info-depth 11
^done,depth="11"
(gdb)
-stack-info-depth 13
^done,depth="12"
(gdb)

The -stack-list-arguments Command

Synopsis

 
 -stack-list-arguments show-values
    [ low-frame high-frame ]

Display a list of the arguments for the frames between low-frame and high-frame (inclusive). If low-frame and high-frame are not provided, list the arguments for the whole call stack.

The show-values argument must have a value of 0 or 1. A value of 0 means that only the names of the arguments are listed, a value of 1 means that both names and values of the arguments are printed.

GDB Command

GDB does not have an equivalent command. gdbtk has a `gdb_get_args' command which partially overlaps with the functionality of `-stack-list-arguments'.

Example

 
(gdb)
-stack-list-frames
^done,
stack=[
frame={level="0 ",addr="0x00010734",func="callee4",
file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8"},
frame={level="1 ",addr="0x0001076c",func="callee3",
file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="17"},
frame={level="2 ",addr="0x0001078c",func="callee2",
file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="22"},
frame={level="3 ",addr="0x000107b4",func="callee1",
file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="27"},
frame={level="4 ",addr="0x000107e0",func="main",
file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="32"}]
(gdb)
-stack-list-arguments 0
^done,
stack-args=[
frame={level="0",args=[]},
frame={level="1",args=[name="strarg"]},
frame={level="2",args=[name="intarg",name="strarg"]},
frame={level="3",args=[name="intarg",name="strarg",name="fltarg"]},
frame={level="4",args=[]}]
(gdb)
-stack-list-arguments 1
^done,
stack-args=[
frame={level="0",args=[]},
frame={level="1",
 args=[{name="strarg",value="0x11940 \"A string argument.\""}]},
frame={level="2",args=[
{name="intarg",value="2"},
{name="strarg",value="0x11940 \"A string argument.\""}]},
{frame={level="3",args=[
{name="intarg",value="2"},
{name="strarg",value="0x11940 \"A string argument.\""},
{name="fltarg",value="3.5"}]},
frame={level="4",args=[]}]
(gdb)
-stack-list-arguments 0 2 2
^done,stack-args=[frame={level="2",args=[name="intarg",name="strarg"]}]
(gdb)
-stack-list-arguments 1 2 2
^done,stack-args=[frame={level="2",
args=[{name="intarg",value="2"},
{name="strarg",value="0x11940 \"A string argument.\""}]}]
(gdb)

The -stack-list-frames Command

Synopsis

 
 -stack-list-frames [ low-frame high-frame ]

List the frames currently on the stack. For each frame it displays the following info:

`level'
The frame number, 0 being the topmost frame, i.e. the innermost function.
`addr'
The $pc value for that frame.
`func'
Function name.
`file'
File name of the source file where the function lives.
`line'
Line number corresponding to the $pc.

If invoked without arguments, this command prints a backtrace for the whole stack. If given two integer arguments, it shows the frames whose levels are between the two arguments (inclusive). If the two arguments are equal, it shows the single frame at the corresponding level.

GDB Command

The corresponding GDB commands are `backtrace' and `where'.

Example

Full stack backtrace:

 
(gdb)
-stack-list-frames
^done,stack=
[frame={level="0 ",addr="0x0001076c",func="foo",
  file="recursive2.c",line="11"},
frame={level="1 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="2 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="3 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="4 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="5 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="6 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="7 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="8 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="9 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="10",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="11",addr="0x00010738",func="main",
  file="recursive2.c",line="4"}]
(gdb)

Show frames between low_frame and high_frame:

 
(gdb)
-stack-list-frames 3 5
^done,stack=
[frame={level="3 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="4 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"},
frame={level="5 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"}]
(gdb)

Show a single frame:

 
(gdb)
-stack-list-frames 3 3
^done,stack=
[frame={level="3 ",addr="0x000107a4",func="foo",
  file="recursive2.c",line="14"}]
(gdb)

The -stack-list-locals Command

Synopsis

 
 -stack-list-locals print-values

Display the local variable names for the current frame. With an argument of 0 prints only the names of the variables, with argument of 1 prints also their values.

GDB Command

`info locals' in GDB, `gdb_get_locals' in gdbtk.

Example

 
(gdb)
-stack-list-locals 0
^done,locals=[name="A",name="B",name="C"]
(gdb)
-stack-list-locals 1
^done,locals=[{name="A",value="1"},{name="B",value="2"},
  {name="C",value="3"}]
(gdb)

The -stack-select-frame Command

Synopsis

 
 -stack-select-frame framenum

Change the current frame. Select a different frame framenum on the stack.

GDB Command

The corresponding GDB commands are `frame', `up', `down', `select-frame', `up-silent', and `down-silent'.

Example

 
(gdb)
-stack-select-frame 2
^done
(gdb)


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