sdcc/support/regression/tests/bug-3461.c

   1 /* bug-3459.c
   2    Multiple codegen issues related to bit-fields and pointers to pointers to structs containing them.
   3  */
   4
   5 #include <testfwk.h>
   6
   7 /// Test derived from code by SF user "Under4Mhz" in 2022.
   8
   9 // GPL Version 2.0
  10 #include <stdbool.h>
  11 #include <stdint.h>
  12 #include <stdio.h>
  13
  14 typedef struct { unsigned char x; unsigned char y; } maths_point_u8;
  15 typedef struct { int x; int y; } maths_point;
  16
  17 typedef struct {
  18
  19     maths_point_u8 position;
  20     unsigned char direction : 4;
  21     unsigned char type : 4;
  22
  23 } ObjectData;
  24
  25 typedef struct {
  26
  27     const ObjectData *objects;
  28     unsigned int objectCount;
  29     const char * const *map;
  30     const ObjectData *start;
  31
  32 } LevelData;
  33
  34 const ObjectData level1Start = { .direction = 1, .type = 1, .position = { 34, 57 } };
  35
  36 const LevelData level1Data = { .objects = 0, .objectCount = 37, .map = 0, .start = &level1Start };
  37
  38 const LevelData *levelData = &level1Data;
  39
  40 void MapStart( maths_point *position, unsigned char *direction ) {
  41
  42     position->x = levelData->start->position.x + 1;
  43     position->y = levelData->start->position.y;
  44     *direction = levelData->start->direction; // The write to *direction was generated as if it was a write to a bit-field.
  45 }
  46
  47 void testBug( void ) {
  48     maths_point p;
  49     unsigned char direction;
  50
  51     MapStart( &p, &direction );
  52
  53         ASSERT (direction == 1);
  54 }
  55