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V617. Argument of the '|' bitwise opera…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Additional information
Contents

V617. Argument of the '|' bitwise operation always contains non-zero value. Consider inspecting the condition.

Jul 03 2012

The analyzer has detected use of a non-zero constant in the bitwise operation OR (|). The result of this expression is always a non-zero value. It may cause incorrect logic of program execution when such an expression is used in conditions or loops.

Consider a simplest example:

enum { FirstValue, SecondValue }; 
int Flags = GetFlags();
if (Flags | SecondValue)
{...}

The expression in the 'if' operator's condition is always true. Errors related to using non-zero constants in bitwise operations occur because of misprints. For example, it may appear that another bitwise operation, for example &, should be used in such a fragment. This is the correct code:

enum { FirstValue, SecondValue };
int Flags = GetFlags();
if (Flags & SecondValue)
{...}

Consider a code sample the analyzer has found in one real application:

#define PSP_HIDEHEADER 0x00000800
BOOL CResizablePageEx::NeedsRefresh(....)
{
  if (m_psp.dwFlags | PSP_HIDEHEADER)
   return TRUE;
  ... 
  return
    CResizableLayout::NeedsRefresh(layout, rectOld, rectNew);
}

It's obvious that the 'if' operator will always execute the 'return TRUE;' branch, which is incorrect. This is the fixed code:

#define PSP_HIDEHEADER 0x00000800
BOOL CResizablePageEx::NeedsRefresh(....)
{
  if (m_psp.dwFlags & PSP_HIDEHEADER)
    return TRUE;
  ... 
  return
    CResizableLayout::NeedsRefresh(layout, rectOld, rectNew);
}

This diagnostic is classified as:

You can look at examples of errors detected by the V617 diagnostic.

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