查找数据段的地址范围 [英] Finding the address range of the data segment

问题描述

作为一个编程练习，我正在用 C 编写一个标记和清除垃圾收集器.我希望扫描数据段(全局变量等)以获取指向已分配内存的指针，但我不知道如何获取该段的地址范围.我怎么能这样做?

As a programming exercise, I am writing a mark-and-sweep garbage collector in C. I wish to scan the data segment (globals, etc.) for pointers to allocated memory, but I don't know how to get the range of the addresses of this segment. How could I do this?

推荐答案

Linux(和其他 unix)的文本(程序代码)和数据边界:

The bounds for text (program code) and data for linux (and other unixes):

#include <stdio.h>
#include <stdlib.h>

/* these are in no header file, and on some
systems they have a _ prepended 
These symbols have to be typed to keep the compiler happy
Also check out brk() and sbrk() for information
about heap */

extern char  etext, edata, end; 

int
main(int argc, char **argv)
{
    printf("First address beyond:
");
    printf("    program text segment(etext)      %10p
", &etext);
    printf("    initialized data segment(edata)  %10p
", &edata);
    printf("    uninitialized data segment (end) %10p
", &end);

    return EXIT_SUCCESS;
}

这些符号的来源:符号 etext ,edata 在哪里和结束定义?

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