6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-06-15 17:30:06 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #1896 from acqn/EnumFix

Browse Source 
[cc65] Fixed diagnostic messages on enumerator overflow
This commit is contained in:
Bob Andrews 2022-11-02 17:34:31 +01:00 committed by GitHub
commit 5fd2b6fe4b
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 22 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/cc65/declare.c
View File

@ -611,20 +611,20 @@ static SymEntry* ParseEnumDecl (const char* Name, unsigned* DSFlags)
} else {
/* Defaulted with the same signedness as the previous member's */
/* Defaulted with the same signedness as the previous member's */
IsSigned = IsSignSigned (MemberType) &&
(unsigned long)EnumVal != GetIntegerTypeMax (MemberType);
/* Enumerate. Signed integer overflow is UB but unsigned integers
** are guaranteed to wrap around.
*/
EnumVal = (long)((unsigned long)EnumVal + 1UL);
/* Enumerate by adding one to the previous value */
EnumVal = (long)(((unsigned long)EnumVal + 1UL) & 0xFFFFFFFFUL);
if (UnqualifiedType (MemberType->C) == T_ULONG && EnumVal == 0) {
/* Warn on 'unsigned long' overflow in enumeration */
Warning ("Enumerator '%s' overflows the range of '%s'",
Ident,
GetBasicTypeName (type_ulong));
/* Error since the new value cannot be represented in the
** largest unsigned integer type supported by cc65 for enum.
*/
Error ("Enumerator '%s' overflows the range of '%s'",
Ident,
GetBasicTypeName (type_ulong));
}
IsIncremented = 1;
@ -657,11 +657,12 @@ static SymEntry* ParseEnumDecl (const char* Name, unsigned* DSFlags)
/* Warn if the incremented value exceeds the range of the previous
** type.
*/
if (IsIncremented &&
EnumVal >= 0 &&
if (PrevErrorCount == ErrorCount &&
IsIncremented &&
(!IsSigned || EnumVal >= 0) &&
NewType->C != UnqualifiedType (MemberType->C)) {
/* The possible overflow here can only be when EnumVal > 0 */
Warning ("Enumerator '%s' (value = %lu) is of type '%s'",
Warning ("Enumerator '%s' (value = %lu) implies type '%s'",
Ident,
(unsigned long)EnumVal,
GetBasicTypeName (NewType));

9
test/err/bug1890.c Normal file
View File

@ -0,0 +1,9 @@
/* bug #1890 - Overflow in enumerator value is not detected */
#include <limits.h>
enum { a = ULONG_MAX, b } c = b;
int main(void)
{
return 0;
}