Vincent Mayeski wrote:
> I'm using the -S flag. Is there a better way to map assembler
> code back to C source?
Vincent,
I have used the following command-line in the past to generate assembly
alisting files (with integrated source):
gcc -c -g -O3 -Wa,-adhls=func.list func.c
As part of the assembly process, the "func.list" file is generated,
containing the source and assembly, like so:
1 .file "func.c"
4 .text
5 Ltext0:
28 .p2align 4,,15
32 .globl _func
34 _func:
1:func.c **** float func( float a, float b )
2:func.c **** {
36 LM1:
37 0000 55 pushl %ebp
38 0001 89E5 movl %esp, %ebp
40 LM2:
41 0003 D9450C flds 12(%ebp)
3:func.c **** return a * b;
43 LM3:
44 0006 D84D08 fmuls 8(%ebp)
4:func.c **** }
46 LM4:
47 0009 5D popl %ebp
48 000a C3 ret
50 Lscope0:
52 .text
54 000b 90909090 Letext:
54 90
It is not the easiest thing in the world to read, but it might help.
Another alternative would be to step through the code in a debugger that
can show the source and assembly code together, such as the Insight
graphical debugger front end for gdb.
--
Tony Wetmore
