小编Tuấ*_*hạm的帖子

我有一个由 cmake 构建的项目。我想用 AddressSanitizer 构建它来检测内存泄漏。我将这些行添加到 CMakeLists.txt 中：

set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")
set (CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_STATIC_LINKER_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")

但它不起作用（它没有显示我哪里有内存泄漏）。我用一个肯定包含内存泄漏的测试应用程序进行了测试，但仍然没有发生任何事情。有人可以解释我应该怎么做吗？

嗨，我目前正在修复我的 valgrind 错误，它们是：

==11925== ERROR SUMMARY: 9 errors from 1 contexts (suppressed: 0 from 0)
==11925== 
==11925== 9 errors in context 1 of 1:
==11925== Syscall param ioctl(generic) points to uninitialised byte(s)
==11925==    at 0xF8B7F47: ioctl (syscall-template.S:84)
==11925==    by 0x1F770DAD: drmIoctl (in /opt/amdgpu/lib/x86_64-linux-gnu/libdrm.so.2.4.0)
==11925==    by 0x1F7756E8: drmCommandWriteRead (in /opt/amdgpu/lib/x86_64-linux-gnu/libdrm.so.2.4.0)
==11925==    by 0x3332C6AC: amdgpu_create_bo_from_user_mem (in /opt/amdgpu/lib/x86_64-linux-gnu/libdrm_amdgpu.so.1.0.0)
==11925==    by 0x32A479F2: ??? (in /usr/lib/x86_64-linux-gnu/gallium-pipe/pipe_radeonsi.so)
==11925==    by 0x32A6E6B3: ??? (in /usr/lib/x86_64-linux-gnu/gallium-pipe/pipe_radeonsi.so)
==11925==    by 0x2D8E8BD6: ??? (in /usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1.0.0)
==11925==    by 0x2D8E05D4: ??? (in /usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1.0.0)
==11925== …

我尝试编写一个包含2个线程的代码,它应该将2个数字xy递增到100,每次增量发生时,都应打印出来.

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

void *inc_x(void *x_void_ptr){
   int *x_ptr = (int *)x_void_ptr;
   while (++(*x_ptr)<100) {
      printf("x increment to %d \n",*x_ptr);
      *x_ptr++;
   }
   return NULL;

}

void *inc_y(void *y_void_ptr){
   int *y_ptr = (int *)y_void_ptr;
   while (++(*y_ptr)<100) {
       printf("y increment to %d \n",*y_ptr);
       *y_ptr++;
   }
   return NULL;
}

int main()
{
    int x = 0;
    int y = 0;
    printf("x: 0 , y : 0\n");
    pthread_t inc_x_thread, inc_y_thread;
    if (pthread_create(&inc_x_thread, NULL, inc_x, &x)) {
        fprintf(stderr, "Error creating thread \n"); …

我在java中进行了关于继承的练习:

public class Gran {
  private int x;
  public Gran() {
    this.x = 68; 
  }
  public int age() {
    this.x = this.x+1; return this.x; 
  }
  @Override
  public String toString() {
    return "Gran " + age();
  }
}

public class Dad extends Gran {
  private int x;
  public Dad(){
    this.x = 41; 
  }
  @Override
  public String toString() {
    return "Dad " + age();
  }
}

public class Sis extends Dad {
  private int x;
  public Sis() {
    this.x = 17;
  } …