[LLVMbugs] [Bug 9354] New: Report implicit casts of an enum type

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9354

           Summary: Report implicit casts of an enum type
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
        AssignedTo: kremenek at apple.com
        ReportedBy: ranma42 at gmail.com
                CC: llvmbugs at cs.uiuc.edu


I'm sanitizing a C project that (mis)uses enums.

I'm looking for a simple way to find out all the occurrence of implicit casts
to an enum type and/or from an enum type, in order to have for coding style
consistency and to ensure that the code is not misusing the enum values.

Example:

typedef enum {
A1=0, B1, C1 } myenum1;

typedef enum {
A2, B2, C2 } myenum2;
...

myenum1 x;
myenum2 y;

if (x == 0) {} /* warning */
if (x == A1) {} /* OK */

if (x == y) {} /* warning */
if (x == ((myenum1) y)) {} /* OK */

switch(x) {
0: /* warning */
B2: /* warning */
C1: /* OK */
}

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