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

问题描述

作为一种编程练习，我在写C.标记 - 清除垃圾收集器我想扫描指针分配的内存中的数据段（全局变量等），但我不知道怎么弄这个段的地址范围。我怎么能这样做呢？

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

有关文本的边界（程序code）和数据Linux（和其他Unix系统）：

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:\n");
    printf("    program text segment(etext)      %10p\n", &etext);
    printf("    initialized data segment(edata)  %10p\n", &edata);
    printf("    uninitialized data segment (end) %10p\n", &end);

    return EXIT_SUCCESS;
}

如果这些符号来自：<一href=\"http://stackoverflow.com/questions/1765969/unable-to-locate-definition-of-etext-edata-end\">Unable定位ETEXT的定义中，edata，最终

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