macOS汇编语言摘要

C++

int global_value = 1;static int static_value = 2;void foo(){  static_value = 3;}int global_value_uninitialized;static int static_value_uninitialized;int main(){  static_value_uninitialized = 4;}

在Terminal中执行

cc -arch i386 -S hello.cpp

得到汇编语言

.section    __TEXT,__text,regular,pure_instructions    .globl  __Z3foov    .p2align    4, 0x90__Z3foov:    pushl   %ebp    movl    %esp, %ebp    calll   L0$pbL0$pb:    popl    %eax    movl    $3, __ZL12static_value-L0$pb(%eax)    popl    %ebp    retl    .globl  _main    .p2align    4, 0x90_main:    pushl   %ebp    movl    %esp, %ebp    calll   L1$pbL1$pb:    popl    %eax    xorl    %ecx, %ecx    movl    $4, __ZL26static_value_uninitialized-L1$pb(%eax)    movl    %ecx, %eax    popl    %ebp    retl    .section    __DATA,__data    .globl  _global_value    .p2align    2_global_value:    .long   1    .p2align    2__ZL12static_value:    .long   2    .globl  _global_value_uninitialized.zerofill __DATA,__common,_global_value_uninitialized,4,2.zerofill __DATA,__bss,__ZL26static_value_uninitialized,4,2

可以看到代码放在(__TEXT,__text)中
global_value和static_value放在(__DATA,__data)中
global_value_uninitialized放在(__DATA,__common)中
static_value_uninitialized放在(__DATA,__bss)中

代码

.section    __TEXT,__text,regular,pure_instructions

有个简写的等价directive

.text

代码

.section    __DATA,__data

有个简写的等价directive

.data

代码

.zerofill __DATA,__common,_global_value_uninitialized,4,2

有个简写的等价directive

.comm _global_value_uninitialized,4

代码

.zerofill __DATA,__bss,__ZL26static_value_uninitialized,4,2

有个简写的等价directive

.lcomm __ZL26static_value_uninitialized,4,2