sdcc/support/regression/tests/bug-3523.c

   1 /* bug-3523.c
   2    Variables on the stack were incorrectly allocated overlapping.
   3  */
   4
   5 #include <testfwk.h>
   6
   7 #pragma disable_warning 85
   8
   9 // Based on code by "Under4Mhz" licensed under GPL 2.0 or later
  10
  11 #include <stdint.h>
  12 #include <stdbool.h>
  13
  14 typedef struct {
  15
  16     int x;
  17     int y;
  18
  19 } maths_point;
  20
  21 void PlayerGridNextGet( maths_point *next ) {
  22
  23     next->x = 1;
  24     next->y = 2;
  25 }
  26
  27 void PlayerGridGet( maths_point *current ) {
  28
  29     current->x = 3;
  30     current->y = 4;
  31 }
  32
  33 int MapGet( int x, int y ) { return 0; }
  34
  35 int StateDoorHiddenOpenSet( int x, int y ) { ASSERT (x == 1); ASSERT (y == 2);} // Bug visible via x == 3 && y == 4 here.
  36
  37 bool ObjectIsHiddenDoor( char ch ) { return true; }
  38
  39 void SoundDoorOpen() {} // Weirdly, this empty function definition is necesssary to trigger the bug.
  40
  41 void Action() {
  42
  43     maths_point next;
  44     PlayerGridNextGet( &next );
  45     char ch = MapGet( next.x, next.y );
  46
  47     maths_point current;
  48     PlayerGridGet( &current );
  49     char chCurrent = MapGet( current.x, current.y );
  50
  51     // Hidden door open
  52     StateDoorHiddenOpenSet( next.x, next.y );
  53 }
  54
  55 void
  56 testBug (void) {
  57     Action();
  58 }
  59