GDB 问题:Pretty-Printing a 2D Array? [英] GDB question: Pretty-Printing a 2D Array?

问题描述

我有一个二维数组矩阵[10][10]，我想在调试时检查它.

I have a 2d array matrix[10][10] that I'd like to inspect at debug time.

我知道我可以在 GDB 中使用

I understand that I can do this in GDB using

p *matrix@10

但它在一行中输出，难以阅读.

But it outputs this in one line, making it difficult to read.

有没有办法让这个输出以任何方式格式化，比如说矩阵?

Is there a way to have this output formatted in any way, lets say as a matrix?

推荐答案

GDB 的一个重要特性是能够在被调试的代码中执行函数，所以你可以实现任何你喜欢的打印，例如:

An important feature of GDB is the ability of execute functions in the debugged code, so you can implement whatever printing you like, for example:

#include <stdio.h>

int matrix[10][10];

void print(int matrix[10][10]) {
  int i, j;
  for (i = 0; i < 10; ++i) {
    for (j = 0; j < 10; ++j)
      printf("%d ", matrix[i][j]);
    printf("
");
  }
}

int main() {
  int i, j;
  for (i = 0; i < 10; ++i) {
    for (j = 0; j < 10; ++j)
      matrix[i][j] = i*10 + j;
  }
}

使用-g开关编译此代码并在GDB下运行后，您可以使用打印功能如下:

After compiling this code with -g switch and running under GDB you can use the print function as follows:

(gdb) call print(matrix)
0 1 2 3 4 5 6 7 8 9 
10 11 12 13 14 15 16 17 18 19 
20 21 22 23 24 25 26 27 28 29 
30 31 32 33 34 35 36 37 38 39 
40 41 42 43 44 45 46 47 48 49 
50 51 52 53 54 55 56 57 58 59 
60 61 62 63 64 65 66 67 68 69 
70 71 72 73 74 75 76 77 78 79 
80 81 82 83 84 85 86 87 88 89 
90 91 92 93 94 95 96 97 98 99 

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