sdcc/support/regression/tests/bug-2932.c

   1 /*
   2    bug-932.c
   3
   4    For a basic block that consists of only a call two al __smallc function with at least two parameters,
   5    the sch pointer of a basic block could be wrong, resulting in incorrect live-range for some corner cases,
   6    which in turn for some corner cases could result in live-range separation incorrectly assuming an
   7    iCode to be dead, which resulted in changes to the iCode that triggered a segfault in the z80 register allocator.
   8  */
   9
  10 #include <testfwk.h>
  11
  12 #ifdef __SDCC
  13 #pragma disable_warning 85
  14 #endif
  15
  16 int fg(void *fp)
  17 {
  18     volatile int i = 1;
  19     return i;
  20 }
  21
  22 extern int fp(int c, void *fp) __smallc
  23 {
  24     return -1;
  25 }
  26
  27 void *infile, *outfile;
  28 static unsigned long int textsize = 0;
  29
  30 int error;
  31
  32 static void Error(const char *message)
  33 {
  34     error++;
  35 }
  36
  37 #define THRESHOLD   2
  38
  39 static int DecodeChar(void)
  40 {
  41     volatile int i = 255;
  42     return i;
  43 }
  44
  45 static void Decode(void)
  46 {
  47     int j, k, c;
  48     unsigned long int  count;
  49
  50     textsize = fg(infile);
  51
  52     for (count = 0; count < textsize; ) {
  53         c = DecodeChar();
  54         if (c < 256) {
  55             if (fp(c, outfile) == -1) {
  56                 Error("");
  57             }
  58             count++;
  59         } else {
  60             j = c - 255 + THRESHOLD;
  61             for (k = 0; k < j; k++) {
  62                 count++;
  63             }
  64         }
  65     }
  66 }
  67
  68 void testBug(void)
  69 {
  70     error = 0;
  71     Decode();
  72     ASSERT (error == 1);
  73 }
  74