Debugging with GDB (September 2007)

Chapter 21: The gd b/mi Interface 281
inst="save %sp, -112, %sp"},
{address="0x000107c0",func-name="main",offset="4",
inst="mov 2, %o0"},
{address="0x000107c4",func-name="main",offset="8",
inst="sethi %hi(0x11800), %o2"}]
(gdb)
Disassemble 3 instructions from the start of main in mixed mo de:
(gdb)
-data-disassemble -f basics.c -l 32 -n 3 -- 1
^done,asm_insns=[
src_and_asm_line={line="31",
file="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb/ \
testsuite/gdb.mi/basics.c",line_asm_insn=[
{address="0x000107bc",func-name="main",offset="0",
inst="save %sp, -112, %sp"}]},
src_and_asm_line={line="32",
file="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb/ \
testsuite/gdb.mi/basics.c",line_asm_insn=[
{address="0x000107c0",func-name="main",offset="4",
inst="mov 2, %o0"},
{address="0x000107c4",func-name="main",offset="8",
inst="sethi %hi(0x11800), %o2"}]}]
(gdb)
The -data-evaluate-expression command
Synopsis
-data-evaluate-expression expr
Evaluate expr as an expression. The expression could contain an inferior function call.
The function call will execute synchronously. If the expression contains spaces, it must be
enclosed in double quotes.
GDB command
The corresponding GDB commands are ‘print’, ‘output’, and ‘call’. In gdbtk only,
there’s a corresponding ‘gdb_eval’ command.
Example
In the following example, the numbers that precede the commands are the tokens de-
scribed in Section 21.1 [gdb/mi Command Syntax], page 265. Notice how gdb/mi returns
the same tokens in its output.
211-data-evaluate-expression A
211^done,value="1"
(gdb)
311-data-evaluate-expression &A
311^done,value="0xefffeb7c"
(gdb)
411-data-evaluate-expression A+3