github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/cls_4byte.c (about)

     1  /* Area:	ffi_call, closure_call
     2     Purpose:	Check structure passing with different structure size.
     3  		Depending on the ABI. Check overlapping.
     4     Limitations:	none.
     5     PR:		none.
     6     Originator:	<andreast@gcc.gnu.org> 20030828	 */
     7  
     8  /* { dg-do run } */
     9  
    10  #include "ffitest.h"
    11  
    12  typedef struct cls_struct_4byte {
    13    unsigned short a;
    14    unsigned short b;
    15  } cls_struct_4byte;
    16  
    17  cls_struct_4byte cls_struct_4byte_fn(struct cls_struct_4byte a1,
    18  			    struct cls_struct_4byte a2)
    19  {
    20    struct cls_struct_4byte result;
    21  
    22    result.a = a1.a + a2.a;
    23    result.b = a1.b + a2.b;
    24  
    25    printf("%d %d %d %d: %d %d\n", a1.a, a1.b, a2.a, a2.b, result.a, result.b);
    26  
    27    return  result;
    28  }
    29  
    30  static void
    31  cls_struct_4byte_gn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    32  		    void* userdata __UNUSED__)
    33  {
    34  
    35    struct cls_struct_4byte a1, a2;
    36  
    37    a1 = *(struct cls_struct_4byte*)(args[0]);
    38    a2 = *(struct cls_struct_4byte*)(args[1]);
    39  
    40    *(cls_struct_4byte*)resp = cls_struct_4byte_fn(a1, a2);
    41  }
    42  
    43  int main (void)
    44  {
    45    ffi_cif cif;
    46    void *code;
    47    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    48    void* args_dbl[5];
    49    ffi_type* cls_struct_fields[4];
    50    ffi_type cls_struct_type;
    51    ffi_type* dbl_arg_types[5];
    52  
    53    struct cls_struct_4byte g_dbl = { 127, 120 };
    54    struct cls_struct_4byte f_dbl = { 12, 128 };
    55    struct cls_struct_4byte res_dbl;
    56  
    57    cls_struct_type.size = 0;
    58    cls_struct_type.alignment = 0;
    59    cls_struct_type.type = FFI_TYPE_STRUCT;
    60    cls_struct_type.elements = cls_struct_fields;
    61  
    62    cls_struct_fields[0] = &ffi_type_ushort;
    63    cls_struct_fields[1] = &ffi_type_ushort;
    64    cls_struct_fields[2] = NULL;
    65  
    66    dbl_arg_types[0] = &cls_struct_type;
    67    dbl_arg_types[1] = &cls_struct_type;
    68    dbl_arg_types[2] = NULL;
    69  
    70    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 2, &cls_struct_type,
    71  		     dbl_arg_types) == FFI_OK);
    72  
    73    args_dbl[0] = &g_dbl;
    74    args_dbl[1] = &f_dbl;
    75    args_dbl[2] = NULL;
    76  
    77    ffi_call(&cif, FFI_FN(cls_struct_4byte_fn), &res_dbl, args_dbl);
    78    /* { dg-output "127 120 12 128: 139 248" } */
    79    printf("res: %d %d\n", res_dbl.a, res_dbl.b);
    80    /* { dg-output "\nres: 139 248" } */
    81  
    82    CHECK(ffi_prep_closure_loc(pcl, &cif, cls_struct_4byte_gn, NULL, code) == FFI_OK);
    83  
    84    res_dbl = ((cls_struct_4byte(*)(cls_struct_4byte, cls_struct_4byte))(code))(g_dbl, f_dbl);
    85    /* { dg-output "\n127 120 12 128: 139 248" } */
    86    printf("res: %d %d\n", res_dbl.a, res_dbl.b);
    87    /* { dg-output "\nres: 139 248" } */
    88  
    89    exit(0);
    90  }