DEBUG模式下, 内存中的变量地址分析-白红宇的个人博客

发布日期：2021-06-30 22:08:36 浏览次数：2 分类：技术文章

本文共 7175 字，大约阅读时间需要 23 分钟。

测试函数的模板实现

/// @file my_template.h/// @brief 测试数据类型用的模板实现#ifndef MY_TEMPLATE_H_2016_0123_1226#define MY_TEMPLATE_H_2016_0123_1226template
    
     void fnTestDataType() {    char szBuf[iArySize] = {'\0'};    unsigned short wTmp = 0;    int iTmp = 0;    long lTmp = 0;    float f = .0f;    double dbl = .0;        char szBuf1[iArySize] = {'\0'};    unsigned short wTmp1 = 0;    int iTmp1 = 0;    long lTmp1 = 0;    float f1 = .0f;    double dbl1 = .0;        printf("============================================================\n");    printf("char array size = %d\n", iArySize);    printf("------------------------------------------------------------\n");    printf("&szBuf[0] = \t0x%p\n", &szBuf[0]);    printf("&szBuf[%d] = \t0x%p\n", iArySize - 1, &szBuf[iArySize - 1]);    printf("&wTmp = \t0x%p\n", &wTmp);    printf("&iTmp = \t0x%p\n", &iTmp);    printf("&lTmp = \t0x%p\n", &lTmp);    printf("&f = \t\t0x%p\n", &f);    printf("&dbl = \t\t0x%p\n", &dbl);        printf("&szBuf1[0] = \t0x%p\n", &szBuf1[0]);    printf("&szBuf1[%d] = \t0x%p\n", iArySize - 1, &szBuf1[iArySize - 1]);    printf("&wTmp1 = \t0x%p\n", &wTmp1);    printf("&iTmp1 = \t0x%p\n", &iTmp1);    printf("&lTmp1 = \t0x%p\n", &lTmp1);    printf("&f1 = \t\t0x%p\n", &f1);    printf("&dbl1 = \t0x%p\n\n", &dbl1);};#endif // #ifndef MY_TEMPLATE_H_2016_0123_1226

测试代码和实验结论

/// @file main.cpp/// @brief DEBUG模式下, 内存中的变量地址分析#include 
     
      using namespace std;#include "my_template.h"/** 试验结论 - <
      
       >    如果定义多个变量    DEBUG模式下, 内存中的变量地址和定义的顺序相同    变量开始地址都是模式地址    先定义的变量在内存高地址    后定义的变量在内存低地址    Release模式下, 经过优化, 变量的内存地址和变量定义的顺序不相同!    如果变量有越界访问的情况, Release模式下的越界访问情况未知.    好像有一些规律, 依赖于编译器的优化选项    依赖变量越界访问达成变量的存取, 在Release模式下会和Debug模式下的运行效果不相同.    运行结果肯定不对了. 是否报错，要看运气了. 如果不报错, 发布后会死的很惨*/int main(int argc, char* argv[]) {	    /// 将函数模板特化的数组大小, 从1填到9来测试    /// 不能直接在一个作用域内写多个函数模板的实例, 会全被替换成最后一个函数模板的实例	fnTestDataType<9>();    printf(""); //< bp	/** IDE debug 变量内存地址分析    ============================================================    char array size = 9    ------------------------------------------------------------    &szBuf[0] =     0x0018FEE8    &szBuf[8] =     0x0018FEF0    &wTmp =         0x0018FEE4    &iTmp =         0x0018FEE0    &lTmp =         0x0018FEDC    &f =            0x0018FED8    &dbl =          0x0018FED0    &szBuf1[0] =    0x0018FEC4    &szBuf1[8] =    0x0018FECC    &wTmp1 =        0x0018FEC0    &iTmp1 =        0x0018FEBC    &lTmp1 =        0x0018FEB8    &f1 =           0x0018FEB4    &dbl1 =         0x0018FEAC        ============================================================    char array size = 8    ------------------------------------------------------------    &szBuf[0] =     0x0018FEEC    &szBuf[7] =     0x0018FEF3    &wTmp =         0x0018FEE8    &iTmp =         0x0018FEE4    &lTmp =         0x0018FEE0    &f =            0x0018FEDC    &dbl =          0x0018FED4    &szBuf1[0] =    0x0018FECC    &szBuf1[7] =    0x0018FED3    &wTmp1 =        0x0018FEC8    &iTmp1 =        0x0018FEC4    &lTmp1 =        0x0018FEC0    &f1 =           0x0018FEBC    &dbl1 =         0x0018FEB4        ============================================================    char array size = 7    ------------------------------------------------------------    &szBuf[0] =     0x0018FEEC    &szBuf[6] =     0x0018FEF2    &wTmp =         0x0018FEE8    &iTmp =         0x0018FEE4    &lTmp =         0x0018FEE0    &f =            0x0018FEDC    &dbl =          0x0018FED4    &szBuf1[0] =    0x0018FECC    &szBuf1[6] =    0x0018FED2    &wTmp1 =        0x0018FEC8    &iTmp1 =        0x0018FEC4    &lTmp1 =        0x0018FEC0    &f1 =           0x0018FEBC    &dbl1 =         0x0018FEB4        ============================================================    char array size = 6    ------------------------------------------------------------    &szBuf[0] =     0x0018FEEC    &szBuf[5] =     0x0018FEF1    &wTmp =         0x0018FEE8    &iTmp =         0x0018FEE4    &lTmp =         0x0018FEE0    &f =            0x0018FEDC    &dbl =          0x0018FED4    &szBuf1[0] =    0x0018FECC    &szBuf1[5] =    0x0018FED1    &wTmp1 =        0x0018FEC8    &iTmp1 =        0x0018FEC4    &lTmp1 =        0x0018FEC0    &f1 =           0x0018FEBC    &dbl1 =         0x0018FEB4        ============================================================    char array size = 5    ------------------------------------------------------------    &szBuf[0] =     0x0018FEEC    &szBuf[4] =     0x0018FEF0    &wTmp =         0x0018FEE8    &iTmp =         0x0018FEE4    &lTmp =         0x0018FEE0    &f =            0x0018FEDC    &dbl =          0x0018FED4    &szBuf1[0] =    0x0018FECC    &szBuf1[4] =    0x0018FED0    &wTmp1 =        0x0018FEC8    &iTmp1 =        0x0018FEC4    &lTmp1 =        0x0018FEC0    &f1 =           0x0018FEBC    &dbl1 =         0x0018FEB4        ============================================================    char array size = 4    ------------------------------------------------------------    &szBuf[0] =     0x0018FEF0    &szBuf[3] =     0x0018FEF3    &wTmp =         0x0018FEEC    &iTmp =         0x0018FEE8    &lTmp =         0x0018FEE4    &f =            0x0018FEE0    &dbl =          0x0018FED8    &szBuf1[0] =    0x0018FED4    &szBuf1[3] =    0x0018FED7    &wTmp1 =        0x0018FED0    &iTmp1 =        0x0018FECC    &lTmp1 =        0x0018FEC8    &f1 =           0x0018FEC4    &dbl1 =         0x0018FEBC        ============================================================    char array size = 3    ------------------------------------------------------------    &szBuf[0] =     0x0018FEF0    &szBuf[2] =     0x0018FEF2    &wTmp =         0x0018FEEC    &iTmp =         0x0018FEE8    &lTmp =         0x0018FEE4    &f =            0x0018FEE0    &dbl =          0x0018FED8    &szBuf1[0] =    0x0018FED4    &szBuf1[2] =    0x0018FED6    &wTmp1 =        0x0018FED0    &iTmp1 =        0x0018FECC    &lTmp1 =        0x0018FEC8    &f1 =           0x0018FEC4    &dbl1 =         0x0018FEBC        ============================================================    char array size = 2    ------------------------------------------------------------    &szBuf[0] =     0x0018FEF0    &szBuf[1] =     0x0018FEF1    &wTmp =         0x0018FEEC    &iTmp =         0x0018FEE8    &lTmp =         0x0018FEE4    &f =            0x0018FEE0    &dbl =          0x0018FED8    &szBuf1[0] =    0x0018FED4    &szBuf1[1] =    0x0018FED5    &wTmp1 =        0x0018FED0    &iTmp1 =        0x0018FECC    &lTmp1 =        0x0018FEC8    &f1 =           0x0018FEC4    &dbl1 =         0x0018FEBC        ============================================================    char array size = 1    ------------------------------------------------------------    &szBuf[0] =     0x0018FEF0    &szBuf[0] =     0x0018FEF0    &wTmp =         0x0018FEEC    &iTmp =         0x0018FEE8    &lTmp =         0x0018FEE4    &f =            0x0018FEE0    &dbl =          0x0018FED8    &szBuf1[0] =    0x0018FED4    &szBuf1[0] =    0x0018FED4    &wTmp1 =        0x0018FED0    &iTmp1 =        0x0018FECC    &lTmp1 =        0x0018FEC8    &f1 =           0x0018FEC4    &dbl1 =         0x0018FEBC	*/	printf("END, press any key to quit\n");	return 0;}

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测试函数的模板实现

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