7.6

    1. !INCLUDE "./code/7.6/swap.c"
    in .symtab? type module section
    buf Yes external m .data
    bufp0 Yes global swap .data
    bufp1 Yes local swap .bss
    swap Yes global swap .text
    temp No ——— ——- ———
    incr Yes local swap .text
    count Yes local swap .bss 
    1. (cd chapter7/code/7.6; make && make sym)

    output:

    1. gcc -c swap.c
    2. objdump -t swap.o
    4. swap.o：     文件格式 elf64-x86-64
    6. SYMBOL TABLE:
    7. 0000000000000000 l     O .bss    0000000000000008 bufp1
    8. 0000000000000000 l     F .text    0000000000000015 incr
    9. 0000000000000008 l     O .bss    0000000000000004 count.1747
    10. 0000000000000000 g     O .data    0000000000000008 bufp0
    11. 0000000000000000         *UND*    0000000000000000 buf
    12. 0000000000000015 g     F .text    0000000000000049 swap