内存布局【代码段、数据段、BSS段、堆、栈】

一、内存布局图
其中BSS【Block Started by Symbol】意思是：以符号开始的块。







二、源码【存为mi.cpp】
#include <stdio.h>

#include <malloc.h>

#include <unistd.h>

int bss_var;

int data_var0=1;

int main(int argc, char** argv)

{

printf("\nbelow are addresses of types of process's mem\n\n");

printf("----------------------------------------------------------\n");

printf("Code location:\n");

printf("\tAddress of main(Code Segment):%p\n",main);

printf("----------------------------------------------------------\n");



printf("Data Location:\n");

printf("\tAddress of data_var(Data Segment):%p\n", &data_var0);

static int data_var1=2;

printf("\tNew end of data_var(Data Segment):%p\n", &data_var1);

printf("----------------------------------------------------------\n");



printf("BSS Location:\n");

printf("\tAddress of bss_var:%p\n", &bss_var);

printf("----------------------------------------------------------\n");



char* b = (char*)sbrk((ptrdiff_t)0);

printf("Heap Location:\n");

printf("\tInitial end of heap:%p\n", b);

brk(b+4);

b=(char*)sbrk((ptrdiff_t)0);

printf("\tNew end of heap:%p\n", b);

char* c=(char*)new char[16];

printf("\tNew2 end of heap:%p\n", c);

char* d=(char*)malloc(16);

printf("\tNew3 end of heap:%p\n", d);

b=(char*)sbrk(0);

printf("\tNew4 end of heap:%p\n", b);

printf("----------------------------------------------------------\n");



int stack_var0=3;

printf("Stack Location:\n");

printf("\tInitial end of stack:%p\n", &stack_var0);

int stack_var1=4;

printf("\tnew end of stack:%p\n",&stack_var1);

printf("----------------------------------------------------------\n");
return 0;

}


三、编译
[erlang@m176com duan]$ g++ -o mi mi.cpp

四、运行
[erlang@m176com duan]$ ./mi
below are addresses of types of process's mem
----------------------------------------------------------

Code location:

Address of main(Code Segment):0x8048504

----------------------------------------------------------

Data Location:

Address of data_var(Data Segment):0x8049b7c

New end of data_var(Data Segment):0x8049b80

----------------------------------------------------------

BSS Location:

Address of bss_var:0x8049b88

----------------------------------------------------------

Heap Location:

Initial end of heap:0x85b9000

New end of heap:0x85b9004

New2 end of heap:0x85b9010

New3 end of heap:0x85b9028

New4 end of heap:0x85db000

----------------------------------------------------------

Stack Location:

Initial end of stack:0xbfe24c38

new end of stack:0xbfe24c34

----------------------------------------------------------

五、看一下内存段信息
[erlang@m176com duan]$ ps -efa|grep mi|grep erlang|grep -v grep|awk '{print $2}'

13371

[erlang@m176com duan]$ cat /proc/13371/maps

005eb000-00600000 r-xp 00000000 68:05 2689943 /lib/ld-2.3.4.so

00600000-00601000 r-xp 00015000 68:05 2689943 /lib/ld-2.3.4.so

00601000-00602000 rwxp 00016000 68:05 2689943 /lib/ld-2.3.4.so

00609000-0072e000 r-xp 00000000 68:05 2689944 /lib/tls/libc-2.3.4.so

0072e000-0072f000 r-xp 00124000 68:05 2689944 /lib/tls/libc-2.3.4.so

0072f000-00732000 rwxp 00125000 68:05 2689944 /lib/tls/libc-2.3.4.so

00732000-00734000 rwxp 00732000 00:00 0

00736000-00757000 r-xp 00000000 68:05 2689945 /lib/tls/libm-2.3.4.so

00757000-00759000 rwxp 00020000 68:05 2689945 /lib/tls/libm-2.3.4.so

008b2000-008b9000 r-xp 00000000 68:05 2689948 /lib/libgcc_s-3.4.6-20060404.so.1

008b9000-008ba000 rwxp 00007000 68:05 2689948 /lib/libgcc_s-3.4.6-20060404.so.1

009cd000-00a8d000 r-xp 00000000 68:05 2941513 /usr/lib/libstdc++.so.6.0.3

00a8d000-00a92000 rwxp 000bf000 68:05 2941513 /usr/lib/libstdc++.so.6.0.3

00a92000-00a98000 rwxp 00a92000 00:00 0

08048000-08049000 r-xp 00000000 68:05 6342667 /home/erlang/duan/mi

08049000-0804a000 rw-p 00000000 68:05 6342667 /home/erlang/duan/mi

0996f000-09991000 rw-p 0996f000 00:00 0

b7fc3000-b7fc5000 rw-p b7fc3000 00:00 0

b7fdb000-b7fdc000 rw-p b7fdb000 00:00 0

bff61000-c0000000 rw-p bff61000 00:00 0

ffffe000-fffff000 ---p 00000000 00:00 0

六、分页存储管理【是从百度文库中摘录的，在此向作者致敬】
http://wenku.baidu.com/view/b7db25687e21af45b307a899.html
























FROM: http://blog.sina.com.cn/s/blog_49f761940100nzr4.html