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V124. Function 'Foo' writes/reads 'N' b…
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
Additional information
Contents

V124. Function 'Foo' writes/reads 'N' bytes. The alignment rules and type sizes have been changed. Consider reviewing this value.

Nov 19 2010

The analyzer detected a potential error: the size of data being written or read is defined by a constant.

When the code is compiled in the 64-bit mode, the sizes of some data and their alignment boundaries will change. The sizes of base types and their alignment boundaries are shown in the picture:

V124/image1.png

The analyzer examines code fragments where the size of data being written or read is defined explicitly. The programmer must review these fragments. Here is a code sample:

size_t n = fread(buf, 1, 40, f_in);

Constant 40 may be an incorrect value from the viewpoint of the 64-bit system. Perhaps you should write it so:

size_t n = fread(buf, 1, 10 * sizeof(size_t), f_in);
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