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• 概要
• • 先说结论
  • 代码
  • 执行结果

在kendryte k210上实验探究未初始化的全局变量，未初始化的静态全局变量，初始化的全局变量，初始化的静态全局变量，未初始化的静态局部变量，初始化的静态局部变量所存在的段。

直接看表格

#include 
#include 

#include "sleep.h"

#define name(x) #x


extern unsigned int _bss;
extern unsigned int _ebss;


extern unsigned int _data;
extern unsigned int _edata;


int x;
int y = 1;
int z;

static int b;
static int c = 1;


void printSection(void *a, char str[100]) {
  if (a > (void *)&_bss && a < (void *)&_ebss) {
    printf("%s locate in bssn", str);
  } else if (a > (void *)&_data && a < (void *)&_edata) {
    printf("%s locate in datan", str);
  } else {
    printf("%s locate in other sectionn", str);
  }
}


void static_test() {
  static int d;
  static int e = 1;
  printf("static variable testn");
  printSection(&b, name(b));
  printSection(&c, name(c));
  printSection(&d, name(d));
  printSection(&e, name(e));
}

int main(void) {
  z = 2;
  printf("normal variable testn");
  printSection(&x, name(x));
  printSection(&y, name(y));
  printSection(&z, name(z));
  static_test();
  while (1) {
    msleep(3000);
  }
  return 0;
}

normal variable test
x locate in bss
y locate in data
z locate in bss
static variable test
b locate in bss
c locate in data
d locate in bss
e locate in data