调用函数时出现分段错误

Question

在我的代码中，我只是尝试使用函数 Print_Matrix(M) 打印初始化矩阵，但是当该函数出现分段错误时，但是当我在主函数中打印它时，它会按预期打印

这是我复制问题的代码

#include<stdio.h>
#include<stdlib.h>

int N = 5;

typedef struct matrix{
    double m[1024][1024];
    int size;
}matrix;

matrix I;
void
Print_Matrix(matrix M)
{
    printf("hello\n");
    int row=0, col=0;

    for (row = 0; row < N; row++) {
        for (col = 0; col < N; col++){
            printf(" %5.2f", M.m[row][col]);
        }
        printf("\n");
    }
    printf("\n\n");
}

int main()
{
    int row, col;
    for (row = 0; row < N; row++) {
        for (col = 0; col < N; col++) {
            if (row == col)
                I.m[row][col] = 1.0;
        }
    }
    for(row=0;row<N;row++){
        for(col=0;col<N;col++){
            printf("%5.2f ", I.m[row][col]);
        }
        printf("\n");
    }
    Print_Matrix(I);


    return 0;
    
}

输出：

#include<stdio.h>
#include<stdlib.h>

int N = 5;

typedef struct matrix{
    double m[1024][1024];
    int size;
}matrix;

matrix I;
void
Print_Matrix(matrix M)
{
    printf("hello\n");
    int row=0, col=0;

    for (row = 0; row < N; row++) {
        for (col = 0; col < N; col++){
            printf(" %5.2f", M.m[row][col]);
        }
        printf("\n");
    }
    printf("\n\n");
}

int main()
{
    int row, col;
    for (row = 0; row < N; row++) {
        for (col = 0; col < N; col++) {
            if (row == col)
                I.m[row][col] = 1.0;
        }
    }
    for(row=0;row<N;row++){
        for(col=0;col<N;col++){
            printf("%5.2f ", I.m[row][col]);
        }
        printf("\n");
    }
    Print_Matrix(I);


    return 0;
    
}

Answer 1

你正在耗尽你的筹码。由地址消毒剂提供：SUMMARY: AddressSanitizer: stack-overflow /tmp/so/m.c:42 in main.

问题是matrix太大而无法在堆栈上传递，因为您必须将 1024^2double推入堆栈（在我的系统上，这是 8388608 字节）。当处理大对象时，通过指针将它们传递给其他函数。

相关变更：

void
Print_Matrix(matrix const *M) // using a pointer
{
    printf("hello\n");
    int row=0, col=0;

    for (row = 0; row < N; row++) {
        for (col = 0; col < N; col++){
            printf(" %5.2f", M->m[row][col]); // using -> instead of .
        }
        printf("\n");
    }
    printf("\n\n");
}
// ...

// later, in main
    Print_Matrix(&I);