在当前目录, 运行多个含有main函数的源文件

  1. cmake_minimum_required(VERSION 3.21)
  3. # 获取目录名
  4. get_filename_component(ProjectId ${CMAKE_CURRENT_SOURCE_DIR} NAME)
  6. # 目录名中的空格替换成下划线
  7. string(REPLACE " " "_" ProjectId ${ProjectId})
  8. # project(${ProjectId} CXX)
  9. project(${ProjectId} C)
  11. set(CMAKE_CXX_STANDARD 23)
  13. # 将目录下的.c存入files
  14. # file(GLOB files "${CMAKE_CURRENT_SOURCE_DIR}/*.cpp")
  15. file(GLOB files "${CMAKE_CURRENT_SOURCE_DIR}/*.c")
  16. foreach(file ${files})
  17. get_filename_component(name ${file} NAME)
  18. add_executable(${name} ${file})
  19. endforeach()

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下断点观察变量的变化

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  • GDB

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  • LLDB

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  • Watchs

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  • 执行下一次断点

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  • Evaluate Expression

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反汇编/disassemble

  1. #include <stdio.h>
  3. int main() {
  4.     for(int i = 0; i < 5; ++i)
  5.     {
  6.         printf("i=%d\n", i);
  7.     }
  9.     return 0;
  10. }

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  1. (lldb) disassemble
  2. 02_DEBUG.c.exe`main(...):
  3. 0x1f14b0 <+0>:  pushl  %ebp
  4. 0x1f14b1 <+1>:  movl   %esp, %ebp
  5. 0x1f14b3 <+3>:  pushl  %ecx
  6. 0x1f14b4 <+4>:  movl   $0xcccccccc, -0x4(%ebp)   ; imm = 0xCCCCCCCC 
  7. 0x1f14bb <+11>: movl   $0x0, -0x4(%ebp)
  8. 0x1f14c2 <+18>: jmp    0x1f14cd                  ; <+29> at 02_DEBUG.c:4
  9. 0x1f14c4 <+20>: movl   -0x4(%ebp), %eax
  10. 0x1f14c7 <+23>: addl   $0x1, %eax
  11. 0x1f14ca <+26>: movl   %eax, -0x4(%ebp)
  12. 0x1f14cd <+29>: cmpl   $0x5, -0x4(%ebp)
  13. 0x1f14d1 <+33>: jge    0x1f14e6                  ; <+54> at 02_DEBUG.c:9
  14. ->  0x1f14d3 <+35>: movl   -0x4(%ebp), %ecx
  15. 0x1f14d6 <+38>: pushl  %ecx
  16. 0x1f14d7 <+39>: pushl  $0x1fa000                 ; imm = 0x1FA000 
  17. 0x1f14dc <+44>: calll  0x1f107d                  ; _printf
  18. 0x1f14e1 <+49>: addl   $0x8, %esp
  19. 0x1f14e4 <+52>: jmp    0x1f14c4                  ; <+20> at 02_DEBUG.c:4
  20. 0x1f14e6 <+54>: xorl   %eax, %eax
  21. 0x1f14e8 <+56>: addl   $0x4, %esp
  22. 0x1f14eb <+59>: cmpl   %esp, %ebp
  23. 0x1f14ed <+61>: calll  0x1f1159                  ; __RTC_CheckEsp
  24. 0x1f14f2 <+66>: movl   %ebp, %esp
  25. 0x1f14f4 <+68>: popl   %ebp
  26.     0x1f14f5 <+69>: retl
  • 设置汇编指令格式: settings set target.x86-disassembly-flavor
    • 常见Intel, AT&T

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  1. (lldb) settings set target.x86-disassembly-flavor intel
  2. (lldb) disassemble
  3. 02_DEBUG.c.exe`main(...):
  4.     0x1f14b0 <+0>:  push   ebp
  5.     0x1f14b1 <+1>:  mov    ebp, esp
  6.     0x1f14b3 <+3>:  push   ecx
  7.     0x1f14b4 <+4>:  mov    dword ptr [ebp - 0x4], 0xcccccccc
  8.     0x1f14bb <+11>: mov    dword ptr [ebp - 0x4], 0x0
  9.     0x1f14c2 <+18>: jmp    0x1f14cd                  ; <+29> at 02_DEBUG.c:4
  10.     0x1f14c4 <+20>: mov    eax, dword ptr [ebp - 0x4]
  11.     0x1f14c7 <+23>: add    eax, 0x1
  12.     0x1f14ca <+26>: mov    dword ptr [ebp - 0x4], eax
  13.     0x1f14cd <+29>: cmp    dword ptr [ebp - 0x4], 0x5
  14.     0x1f14d1 <+33>: jge    0x1f14e6                  ; <+54> at 02_DEBUG.c:9
  15. ->  0x1f14d3 <+35>: mov    ecx, dword ptr [ebp - 0x4]
  16.     0x1f14d6 <+38>: push   ecx
  17.     0x1f14d7 <+39>: push   0x1fa000
  18.     0x1f14dc <+44>: call   0x1f107d                  ; _printf
  19.     0x1f14e1 <+49>: add    esp, 0x8
  20.     0x1f14e4 <+52>: jmp    0x1f14c4                  ; <+20> at 02_DEBUG.c:4
  21.     0x1f14e6 <+54>: xor    eax, eax
  22.     0x1f14e8 <+56>: add    esp, 0x4
  23.     0x1f14eb <+59>: cmp    ebp, esp
  24.     0x1f14ed <+61>: call   0x1f1159                  ; __RTC_CheckEsp
  25.     0x1f14f2 <+66>: mov    esp, ebp
  26.     0x1f14f4 <+68>: pop    ebp
  27.     0x1f14f5 <+69>: ret
  1. (lldb) settings set target.x86-disassembly-flavor att 
  2. (lldb) disassemble
  3. 02_DEBUG.c.exe`main(...):
  4.     0x1f14b0 <+0>:  pushl  %ebp
  5.     0x1f14b1 <+1>:  movl   %esp, %ebp
  6.     0x1f14b3 <+3>:  pushl  %ecx
  7.     0x1f14b4 <+4>:  movl   $0xcccccccc, -0x4(%ebp)   ; imm = 0xCCCCCCCC 
  8.     0x1f14bb <+11>: movl   $0x0, -0x4(%ebp)
  9.     0x1f14c2 <+18>: jmp    0x1f14cd                  ; <+29> at 02_DEBUG.c:4
  10.     0x1f14c4 <+20>: movl   -0x4(%ebp), %eax
  11.     0x1f14c7 <+23>: addl   $0x1, %eax
  12.     0x1f14ca <+26>: movl   %eax, -0x4(%ebp)
  13.     0x1f14cd <+29>: cmpl   $0x5, -0x4(%ebp)
  14.     0x1f14d1 <+33>: jge    0x1f14e6                  ; <+54> at 02_DEBUG.c:9
  15. ->  0x1f14d3 <+35>: movl   -0x4(%ebp), %ecx
  16.     0x1f14d6 <+38>: pushl  %ecx
  17.     0x1f14d7 <+39>: pushl  $0x1fa000                 ; imm = 0x1FA000 
  18.     0x1f14dc <+44>: calll  0x1f107d                  ; _printf
  19.     0x1f14e1 <+49>: addl   $0x8, %esp
  20.     0x1f14e4 <+52>: jmp    0x1f14c4                  ; <+20> at 02_DEBUG.c:4
  21.     0x1f14e6 <+54>: xorl   %eax, %eax
  22.     0x1f14e8 <+56>: addl   $0x4, %esp
  23.     0x1f14eb <+59>: cmpl   %esp, %ebp
  24.     0x1f14ed <+61>: calll  0x1f1159                  ; __RTC_CheckEsp
  25.     0x1f14f2 <+66>: movl   %ebp, %esp
  26.     0x1f14f4 <+68>: popl   %ebp
  27.     0x1f14f5 <+69>: retl
  • 将语句复制到.lldbint ,设置汇编显示的默认格式

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Memory View

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  • &main

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  • &i

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小端序: 低地址位在最左侧