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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++

LANG.TYPE.AWID : Expression Value Widened by Assignment

Summary

The value of a composite expression is assigned to an object with wider essential type.

This warning class is based on the notions of essential type category and composite expression as described in MISRA C:2012 Guidelines for the use of the C language in critical systems.

Properties

Class Name Expression Value Widened by Assignment
Significance style
Mnemonic LANG.TYPE.AWID
Categories
MisraC2025 MisraC2025:10.6 The value of a composite expression shall not be assigned to an object with wider essential type
MisraC2023 MisraC2023:10.6 The value of a composite expression shall not be assigned to an object with wider essential type
Misra2012 Misra2012:10.6 The value of a composite expression shall not be assigned to an object with wider essential type
Misra2004 Misra2004:10.1 The value of an expression of integer type shall not be implicitly converted to a different underlying type if: (a) it is not a conversion to a wider integer type of the same signedness, or (b) the expression is complex, or (c) the expression is not constant and is a function argument, or (d) the expression is not constant and is a return expression
  Misra2004:10.2 The value of an expression of floating type shall not be implicitly converted to a different type if: (a) it is not a conversion to a wider floating type, or (b) the expression is complex, or (c) the expression is a function argument, or (d) the expression is a return expression
AUTOSARC++14 AUTOSARC++14:M5-0-3 A cvalue expression shall not be implicitly converted to a different underlying type.
  AUTOSARC++14:M5-0-5 There shall be no implicit floating-integral conversions.
MisraC++2008 MisraC++2008:5-0-3 A cvalue expression shall not be implicitly converted to a different underlying type.
  MisraC++2008:5-0-5 There shall be no implicit floating-integral conversions.
CWE CWE:704 Incorrect Type Conversion or Cast
CERT-C CERT-C:INT18-C Evaluate integer expressions in a larger size before comparing or assigning to that size
Availability Available for C and C++.
Enabling Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file. 
RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Expression Value Widened by Assignment"
Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example 

void f_longarg(long inl);
void use_longs(long a, long b, long c);

void TYPE_AWID(short s1, short s2){
  long long1;
  long long2;
  long long3;

  long1 = s1;                                /* not a composite expression */

  long2 = s1 + s2;      /* 'Expression Value Widened by Assignment' warning issued here */

  long3 = (long) s1 + s2;                    /* '(long) s1' causes entire expression to have 'long' type */
  use_longs(long1, long2, long3);

  f_longarg(2*s1);     /* 'Expression Value Widened by Assignment' warning issued here */
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

 

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