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C语言内存分配

2011-07-28 22:18:29| 分类： C | 标签： |举报 |字号大中小订阅

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源程序代码为：
int intGloa=0;
char c='a';
int main(){
    int b;
    char s[]="abcdefghigkmnl";
    char * pChar="您好吗";
    static int sintC=88888;
    static float flsB=888.888;
    return 0;
}
转成汇编代码为：
.file    "demo7.c"
    .intel_syntax noprefix
.globl _intGloa
    .bss
    .align 4
_intGloa:
    .space 4
.globl _c
    .data
_c:
    .byte    97
    .def    ___main;    .scl    2;    .type    32;    .endef
    .section .rdata,"dr"
LC1:
    .ascii "\304\372\272\303\302\360\0"
LC0:
    .ascii "abcdefghigkmnl\0"
    .text
.globl _main
    .def    _main;    .scl    2;    .type    32;    .endef
_main:
    push    ebp
    mov    ebp, esp
    and    esp, -16
    push    edi
    push    esi
    push    ebx
    sub    esp, 36
    call    ___main
    lea    edx, [esp+13]
    mov    ebx, OFFSET FLAT:LC0
    mov    eax, 15
    mov    edi, edx
    mov    esi, ebx
    mov    ecx, eax
    rep movsb
    mov    DWORD PTR [esp+28], OFFSET FLAT:LC1
    mov    eax, 0
    add    esp, 36
    pop    ebx
    pop    esi
    pop    edi
    leave
    ret
    .data
    .align 4
_flsB.1221:
    .long    1147025621
    .align 4
_sintC.1220:
    .long    88888
C程序内存分配

内存区	含义	寄存器
栈	用来存放函数形参，与函数内变量，栈的压与出由代码区代码负责生成相关代码	ebp:栈基址寄存器 esp:栈指针
堆	用malloc、calloc、realloc函数分配的空间，空间的释放由程序员自己处理
全局区	进程加载就分配了空间，直到进种程结束。存放全局变量与静态变量	ds:数据段寄存器存基址
文字区	为了加快程序速度，在编译时把字符串放在文字区，进程起动就分配空间了，其实也是属于全局区。
代码区	存放程序代码区	cs：代码段基地址 eip:存放下条代码偏移量

本程序c代码与汇编对照

C代码	汇编
int intGloa=0;	_intGloa: .space 4
char c='a';	.globl _c.data _c:.byte 97 c语言的ascill字符当作整形数存在
char s[]="abcdefghigkmnl";	LC0:.ascii "abcdefghigkmnl\0"。汇编生成标签，其后添加\0表示结束，所以判断一个字符串是否结束可以用\0来判断
char * pChar="您好吗";	LC1:.ascii "\304\372\272\303\302\360\0"。中文用相应字符编码表示
static int sintC=88888;	_flsB.1221: .long 1147025621 .align 4 对象对齐方式与二进制值

5、总结：基本上是按照汇编程序的方式进行分段

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