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Examples of errors detected by the V609…

Examples of errors detected by the V609 diagnostic

V609. Possible division or mod by zero.


VNL

V609 Divide by zero. Denominator 'x' == 0. pow_ii.c 28


integer pow_ii(integer *ap, integer *bp)
{
  integer pow, x, n;
  unsigned long u;

  x = *ap;
  n = *bp;

  if (n <= 0)
  {
    if (n == 0 || x == 1)
      return 1;

    if (x != -1)
      return x == 0 ? 1/x : 0;

    n = -n;
  }
  ....
}

Mozilla Thunderbird

V609 Divide by zero. Denominator range [0..8]. ionbuilder.cpp 10922


static inline size_t UnboxedTypeSize(JSValueType type)
{
  switch (type) {
    ....
  default: return 0;
  }
}

MInstruction*IonBuilder::loadUnboxedProperty(size_t offset,
                              JSValueType unboxedType, ....)
{
  size_t index = offset / UnboxedTypeSize(unboxedType);
  ....
}

Similar errors can be found in some other places:

  • V609 Divide by zero. Denominator range [0..8]. ionbuilder.cpp 11844

Inkscape

V609 Divide by zero. Denominator range [0..999]. lpe-fillet-chamfer.cpp 607


Geom::PathVector
LPEFilletChamfer::doEffect_path(....)
{
  ....
  if(....){
    ....
  } else if (type >= 3000 && type < 4000) {
      unsigned int chamferSubs = type-3000;
      ....
      double chamfer_stepsTime = 1.0/chamferSubs;
      ....
  }
  ....
}

Similar errors can be found in some other places:

  • V609 Divide by zero. Denominator range [0..999]. lpe-fillet-chamfer.cpp 623

Chromium

V609 Divide by zero. Denominator range [0..4096]. addr.h 159


static int BlockSizeForFileType(FileType file_type) {
    switch (file_type) {
      ....
      default:
        return 0;
    }
}

static int RequiredBlocks(int size, FileType file_type)
{
  int block_size = BlockSizeForFileType(file_type);
  return (size + block_size - 1) / block_size;             // <=
}

EFL Core Libraries

V609 Mod by zero. Denominator range [0..24]. eina_inline_value_util.x 59


static inline size_t
eina_value_util_type_size(const Eina_Value_Type *type)
{
  if (type == EINA_VALUE_TYPE_INT)
    return sizeof(int32_t);
  if (type == EINA_VALUE_TYPE_UCHAR)
    return sizeof(unsigned char);
  if ((type == EINA_VALUE_TYPE_STRING) ||
      (type == EINA_VALUE_TYPE_STRINGSHARE))
    return sizeof(char*);
  if (type == EINA_VALUE_TYPE_TIMESTAMP)
    return sizeof(time_t);
  if (type == EINA_VALUE_TYPE_ARRAY)
    return sizeof(Eina_Value_Array);
  if (type == EINA_VALUE_TYPE_DOUBLE)
    return sizeof(double);
  if (type == EINA_VALUE_TYPE_STRUCT)
    return sizeof(Eina_Value_Struct);
  return 0;                                            // <=
}

static inline unsigned int
eina_value_util_type_offset(
  const Eina_Value_Type *type, unsigned int base)
{
   unsigned size, padding;
   size = eina_value_util_type_size(type);             // <=
   if (!(base % size))                                 // <=
     return base;
   padding = ( (base > size) ? (base - size) : (size - base));
   return base + padding;
}

SpeedCrunch

V609 Divide by zero. Denominator range [0..4]. floatconvert.c 266


static int
lgbase( signed char base)
{
  switch(base)
  {
    case 2:
      return 1;
    case 8:
      return 3;
    case 16:
      return 4;
  }
  return 0;                                       // <=
}

static void
_setlongintdesc(
  p_ext_seq_desc n,
  t_longint* l,
  signed char base)
{
  int lg;

  n->seq.base = base;
  lg = lgbase(base);                              // <=
  n->seq.digits = (_bitlength(l) + lg - 1) / lg;  // <=
  n->seq.leadingSignDigits = 0;
  n->seq.trailing0 = _lastnonzerobit(l) / lg;     // <=
  n->seq.param = l;
  n->getdigit = _getlongintdigit;
}

Haiku Operation System

V609 Divide by zero. Denominator range [0..64]. UiUtils.cpp 544


static int32 GetSIMDFormatByteSize(uint32 format)
{
  switch (format) {
    case SIMD_RENDER_FORMAT_INT8:
      return sizeof(char);
    case SIMD_RENDER_FORMAT_INT16:
      return sizeof(int16);
    case SIMD_RENDER_FORMAT_INT32:
      return sizeof(int32);
    case SIMD_RENDER_FORMAT_INT64:
      return sizeof(int64);
    case SIMD_RENDER_FORMAT_FLOAT:
      return sizeof(float);
    case SIMD_RENDER_FORMAT_DOUBLE:
      return sizeof(double);
  }
  return 0;
}

const BString&
UiUtils::FormatSIMDValue(const BVariant& value, uint32 bitSize,
  uint32 format, BString& _output)
{
  _output.SetTo("{");
  char* data = (char*)value.ToPointer();
  uint32 count = bitSize / (GetSIMDFormatByteSize(format) * 8);  // <=
  ....
}

ROOT

V609 Divide by zero. Denominator range [0..100]. TGHtmlImage.cxx 340


const char *TGHtml::GetPctWidth(TGHtmlElement *p, char *opt, char *ret)
{
  int n, m, val;
  ....
  if (n < 0 || n > 100) return z;
  if (opt[0] == 'h') {
    val = fCanvas->GetHeight() * 100;
  } else {
    val = fCanvas->GetWidth() * 100;
  }
  if (!fInTd) {
    snprintf(ret, 15, "%d", val / n);
  } else {
    ....
  }
  ....
}

LLVM/Clang

V609 Mod by zero. Denominator 'd.s.low' == 0. udivmoddi4.c 61


typedef int32_t si_int;
typedef uint32_t su_int;

typedef union {
  du_int all;
  struct {
#if _YUGA_LITTLE_ENDIAN
    su_int low;
    su_int high;
#else
    su_int high;
    su_int low;
#endif // _YUGA_LITTLE_ENDIAN
  } s;
} udwords;

COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem) {
  ....
  if (d.s.low == 0) {
    if (d.s.high == 0) {
      // K X
      // ---
      // 0 0
      if (rem)
        *rem = n.s.high % d.s.low;
      return n.s.high / d.s.low;
    }
  ....
}

Similar errors can be found in some other places:

  • V609 Divide by zero. Denominator 'd.s.low' == 0. udivmoddi4.c 62

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