当前位置:首页>java>大疆面试官直接开问:你写的代码在运行时怎么变成可执行文件?我答完编译链接,他摇头:没了?就这?

大疆面试官直接开问:你写的代码在运行时怎么变成可执行文件?我答完编译链接,他摇头:没了?就这?

  • 2026-01-29 18:12:30
大疆面试官直接开问:你写的代码在运行时怎么变成可执行文件?我答完编译链接,他摇头:没了?就这?
最强八股文,就在卡码笔记:https://notes.kamacoder.com/
以下为知识星球录友分享:2026大疆春招提前批一面:如何将用户程序变为可执行程序??(下文知识图解部分提供了演示图)

简要回答

将用户程序(源代码)变为可执行程序需要经过编译、链接两个主要阶段:

编译:将高级语言源代码翻译成机器相关的目标代码

链接:将多个目标文件库文件组合成最终可执行文件

详细回答

完整构建过程:

  1. 预处理(Preprocessing) 处理以#开头的预处理指令展开头文件#include),宏替换#define),条件编译#ifdef等), 生成纯C/C++文件

  2. 编译(Compilation) 词法分析:将源代码分解为token(关键字、标识符、常量等), 语法分析:构建抽象语法树(AST)语义分析:类型检查、作用域分析, 代码优化:中间代码生成和优化, 代码生成:生成特定目标机器的汇编代码

  3. 汇编(Assembly) 将汇编代码翻译成机器指令生成目标文件(.o或.obj) 包含代码段、数据段、符号表、重定位信息

  4. 链接(Linking) 符号解析:解析函数和变量的引用, 地址分配:为各段分配运行时内存地址重定位:修正目标文件中的相对地址, 库链接:链接静态库或动态库, 生成最终可执行文件

代码示例

1. 预处理(生成main.i和math_utils.i)g++ -E main.cpp -o main.ig++ -E math_utils.cpp -o math_utils.i2. 编译为汇编代码(生成main.s和math_utils.s)g++ -S main.cpp -o main.sg++ -S math_utils.cpp -o math_utils.s3. 汇编为目标文件(生成main.o和math_utils.o)g++ -c main.cpp -o main.og++ -c math_utils.cpp -o math_utils.o4. 链接为可执行文件(生成main)g++ main.o math_utils.o -o main# 或者一步完成(不推荐用于学习)g++ main.cpp math_utils.cpp -o main

知识拓展

  • 静态链接 vs 动态链接

静态链接: 库代码直接复制到可执行文件中, 文件较大,但运行时不依赖外部库, 使用-static选项

动态链接: 可执行文件只包含库引用, 运行时由动态链接器加载库, 节省磁盘和内存空间, 便于库更新

  • 知识图解
程序从存储到执行的内存映射图
  • 面试官很能追问

Q1:编译和解释的区别?

A1: 编译:一次性将源代码翻译成机器码,执行效率高 解释:逐行翻译执行,便于调试,执行效率较低 即时编译:运行时编译热点代码,结合两者优点

Q2:什么是重定位?

A2: 链接器将多个目标文件的相同段合并时,需要调整相对地址 重定位表记录所有需要修正的地址引用 分为链接时重定位和加载时重定位

Q3:如何减少编译时间?

A3: 使用预编译头文件, 增量编译(make, ninja), 分布式编译(distcc, icecc), 前向声明替代包含头文件, 使用编译缓存(ccache)

如果你在学习、求职的路上,需要有个高手全程带你,欢迎报名:

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  1. CONNECT:[ UseTime:0.001085s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001423s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000732s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000680s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001485s ]
  6. SELECT * FROM `set` [ RunTime:0.000558s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001474s ]
  8. SELECT * FROM `article` WHERE `id` = 468945 LIMIT 1 [ RunTime:0.001475s ]
  9. UPDATE `article` SET `lasttime` = 1770484953 WHERE `id` = 468945 [ RunTime:0.017132s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000637s ]
  11. SELECT * FROM `article` WHERE `id` < 468945 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001394s ]
  12. SELECT * FROM `article` WHERE `id` > 468945 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000994s ]
  13. SELECT * FROM `article` WHERE `id` < 468945 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005195s ]
  14. SELECT * FROM `article` WHERE `id` < 468945 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002109s ]
  15. SELECT * FROM `article` WHERE `id` < 468945 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002854s ]
0.201953s