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V604. It is odd that the number of iter…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
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Contents

V604. It is odd that the number of iterations in the loop equals to the size of the pointer.

Feb 27 2012

The analyzer has detected a potential error in a construct that comprises a loop. The loop is odd because the number of iterations in it equals to the sizeof(pointer). It is highly probable that the number of iterations should correspond to the size of the array the pointer refers to.

Let's see how such an error might occur. This is how the program looked at first:

char A[N];
for (size_t i=0; i < sizeof(A); ++i)
  A[i] = 0;

Then the program code underwent some changes and the 'A' array has become a variable-sized array. The code has become incorrect:

char *A = (char *)malloc(N);
for (size_t i=0; i < sizeof(A); ++i)
  A[i] = 0;

Now the "sizeof(A)" expression returns the pointer size, not the array's size.

This is the correct code:

char *A = (char *)malloc(N);
for (size_t i=0; i < N; ++i)
  A[i] = 0;

This diagnostic is classified as:

You can look at examples of errors detected by the V604 diagnostic.

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