On Thursday 30 October 2008, Jonny Taylor wrote:
> I have a program written in C++, which is normally compiled with gcc
> to object files and then linked (with gcc). I can get cachegrind/
> cg_annotate to display source-level output like this:
>
> . . . . . . . . . void init_hash_table(char *file_name, Word_Node
> *table[])
> 3 1 1 . . . 1 0 0 {
> . . . . . . . . . FILE *file_ptr;
> . . . . . . . . . Word_Info *data;
> 1 0 0 . . . 1 1 1 int line = 1, i;
> . . . . . . . . .
> 5 0 0 . . . 3 0 0 data = (Word_Info *) create(sizeof(Word_Info));
>
> but I would like to see instruction-level output something like this
>
> init_hash_table:
> 1 0 0 . . . . . . leal -12(%ebp),%eax
> 1 0 0 . . . 1 0 0 movl %eax,84(%ebx)
> 1 0 0 0 0 0 1 0 0 movl $1,-20(%ebp)
> 1 0 0 . . . . . . movl $.LnrB,%eax
> 1 0 0 . . . 1 0 0 movl %eax,-16(%ebp)
Hmm... if your C++ code is in foo.cpp, you get the assembler file with
g++ -S foo.cpp -o foo.s
then, the binary with
gcc -g foo.s -o foo
For me, running
valgrind --tool=cachegrind ./foo
and cg_annotate, I get annotated disassembly like
. . . . . . . . . .globl main
. . . . . . . . . .type main, @function
. . . . . . . . . main:
1 0 0 0 0 0 0 0 0 leal 4(%esp), %ecx
1 0 0 0 0 0 0 0 0 andl $-16, %esp
1 0 0 1 0 0 1 0 0 pushl -4(%ecx)
1 0 0 0 0 0 1 0 0 pushl %ebp
I assume this is what you want. As Nick said, you have to map instructions to
C++ lines
yourself. For this, you also can compare the annotation with foo-g.s from
g++ -g -S foo.cpp -o foo-g.s
as here, foo-g.s contains ".file"/".loc" macros providing the source lines for
instructions.
However, if you are comfortable with KDE GUIs, you can get at disassembly
annotation by
using
g++ -g foo.cpp -o foo
valgrind --tool=callgrind --simulate-cache=yes --dump-instr=yes ./foo
and visualizing the result in KCachegrind, more especially look at the
disassembly view.
Josef
>
> Any advice on how to achieve that would be very helpful!
> Cheers
> Jonny
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