1

  1. #include <stdio.h>
  2. #include <stdint.h>
  4. #ifdef __GNUC__
  5. #define PACKED_STRUCT(__Declaration__)                                         \
  6.     __Declaration__ __attribute__((__packed__))
  7. #endif
  9. #ifdef _MSC_VER
  10. #define PACKED_STRUCT(__Declaration__)                                         \
  11.     __pragma(pack(push, 1)) __Declaration__ __pragma(pack(pop))
  12. #endif
  14. // structure of bar
  15. struct vastai_bar1 {
  16.     char id; // bar id
  17.     uint32_t : 8; // reserved
  18.     uint64_t size; // base address of ddr
  19. };
  21. PACKED_STRUCT(struct vastai_bar2 {
  22.     char id; // bar id
  23.     uint32_t : 8; // reserved
  24.     uint64_t size; // base address of ddr
  25. });
  27. typedef PACKED_STRUCT(struct vastai_bar3 {
  28.     char id; // bar id
  29.     uint32_t : 8; // reserved
  30.     uint64_t size; // base address of ddr
  31. }) vastai_bar3_t;
  33. int main(void)
  34. {
  35.     struct vastai_bar1 bar1 = { .id = 1, .size = 1 };
  36.     printf("size of struct vastai_bar1:%zu\n", sizeof(struct vastai_bar1));
  37.     printf("size of bar1:%zu\n", sizeof(bar1));
  38.     printf("bar1: id=%d, size=%llu\n\n", bar1.id, bar1.size);
  40.     struct vastai_bar2 bar2 = { .id = 2, .size = 2 };
  41.     printf("size of struct vastai_bar2:%zu\n", sizeof(struct vastai_bar2));
  42.     printf("size of bar2:%zu\n", sizeof(bar2));
  43.     printf("bar2: id=%d, size=%llu\n\n", bar2.id, bar2.size);
  45.     struct vastai_bar3 bar3 = { .id = 3, .size = 3 };
  46.     printf("size of struct vastai_bar3:%zu\n", sizeof(struct vastai_bar3));
  47.     printf("size of bar3:%zu\n", sizeof(bar3));
  48.     printf("bar3: id=%d, size=%llu\n\n", bar3.id, bar3.size);
  49. }

linux gcc运行结果

  1. size of struct vastai_bar1:16
  2. size of bar1:16
  3. bar1: id=1, size=1
  5. size of struct vastai_bar2:10
  6. size of bar2:10
  7. bar2: id=2, size=2
  9. size of struct vastai_bar3:10
  10. size of bar3:10
  11. bar3: id=3, size=3

windows vs2022运行结果：

  1. size of struct vastai_bar1:16
  2. size of bar1:16
  3. bar1: id=1, size=1
  5. size of struct vastai_bar2:13
  6. size of bar2:13
  7. bar2: id=2, size=2
  9. size of struct vastai_bar3:13
  10. size of bar3:13
  11. bar3: id=3, size=3

2

  1. #include <stdio.h>
  2. #include <stdint.h>
  4. #ifdef __GNUC__
  5. #define PACKED_STRUCT(__Declaration__)                                         \
  6.     __Declaration__ __attribute__((__packed__))
  7. #endif
  9. #ifdef _MSC_VER
  10. #define PACKED_STRUCT(__Declaration__)                                         \
  11.     __pragma(pack(push, 1)) __Declaration__ __pragma(pack(pop))
  12. #endif
  14. // structure of bar
  15. struct vastai_bar1 {
  16.     char id; // bar id
  17.     uint32_t : 16; // reserved
  18.     uint64_t size; // base address of ddr
  19. };
  21. PACKED_STRUCT(struct vastai_bar2 {
  22.     char id; // bar id
  23.     uint32_t : 16; // reserved
  24.     uint64_t size; // base address of ddr
  25. });
  27. typedef PACKED_STRUCT(struct vastai_bar3 {
  28.     char id; // bar id
  29.     uint32_t : 16; // reserved
  30.     uint64_t size; // base address of ddr
  31. }) vastai_bar3_t;
  33. int main(void)
  34. {
  35.     struct vastai_bar1 bar1 = { .id = 1, .size = 1 };
  36.     printf("size of struct vastai_bar1:%zu\n", sizeof(struct vastai_bar1));
  37.     printf("size of bar1:%zu\n", sizeof(bar1));
  38.     printf("bar1: id=%d, size=%llu\n\n", bar1.id, bar1.size);
  40.     struct vastai_bar2 bar2 = { .id = 2, .size = 2 };
  41.     printf("size of struct vastai_bar2:%zu\n", sizeof(struct vastai_bar2));
  42.     printf("size of bar2:%zu\n", sizeof(bar2));
  43.     printf("bar2: id=%d, size=%llu\n\n", bar2.id, bar2.size);
  45.     struct vastai_bar3 bar3 = { .id = 3, .size = 3 };
  46.     printf("size of struct vastai_bar3:%zu\n", sizeof(struct vastai_bar3));
  47.     printf("size of bar3:%zu\n", sizeof(bar3));
  48.     printf("bar3: id=%d, size=%llu\n\n", bar3.id, bar3.size);
  49. }

linux gcc运行结果

  1. size of struct vastai_bar1:16
  2. size of bar1:16
  3. bar1: id=1, size=1
  5. size of struct vastai_bar2:11
  6. size of bar2:11
  7. bar2: id=2, size=2
  9. size of struct vastai_bar3:11
  10. size of bar3:11
  11. bar3: id=3, size=3

windows vs2022运行结果：

  1. size of struct vastai_bar1:16
  2. size of bar1:16
  3. bar1: id=1, size=1
  5. size of struct vastai_bar2:13
  6. size of bar2:13
  7. bar2: id=2, size=2
  9. size of struct vastai_bar3:13
  10. size of bar3:13
  11. bar3: id=3, size=3

3

  1. typedef PACKED_STRUCT(struct process {
  2.     // host pid
  3.     uint32_t pid : 32;
  4.     // container pid, pid==vpid means host, else means container
  5.     uint32_t vpid : 32;
  6.     // namespace, we use ns to check whether 2 processes are in the same container
  7.     uint64_t ns : 64;
  8.     // level, 0 means host, else means container
  9.     uint32_t level : 32;
  10.     // VACC_GET_PROCESS
  11.     // 0 process exit, 1 process not exit
  12.     // VACC_RELEASE_PROCESS
  13.     // 0 process not used, 1 process used not to release
  14.     uint32_t state : 2;
  15.     // VACC_RELEASE_PROCESS
  16.     // 0 normal release
  17.     // 1 warn release, not all results were taken
  18.     // 2 error release, not getting enough task results
  19.     uint32_t release : 2;
  20.     uint32_t : 28;
  21.     uint64_t : 64;
  22. }) process_t;

该结构体在linux，windows的大小都是32, 因为它已经对齐了。