add a diagnostic:
t.c:1:12: warning: ISO C restricts enumerator values to range of 'int' (180388626432 is too large)
enum e {A, B = 42LL << 32, C = -4, D = 12456 };
^
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41530 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/SemaDecl.cpp b/Sema/SemaDecl.cpp
index 5ab40ec..301813b 100644
--- a/Sema/SemaDecl.cpp
+++ b/Sema/SemaDecl.cpp
@@ -987,6 +987,7 @@
// TODO: If the result value doesn't fit in an int, it must be a long or long
// long value. ISO C does not support this, but GCC does as an extension,
// emit a warning.
+ unsigned IntWidth = Context.getTypeSize(Context.IntTy, Enum->getLocation());
// Verify that all the values are okay, and reverse the list.
@@ -995,6 +996,19 @@
EnumConstantDecl *ECD =
cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i]));
if (!ECD) continue; // Already issued a diagnostic.
+
+ // If the enum value doesn't fit in an int, emit an extension warning.
+ assert(ECD->getInitVal().getBitWidth() >= IntWidth &&
+ "Should have promoted value to int");
+ const llvm::APSInt &InitVal = ECD->getInitVal();
+ if (InitVal.getBitWidth() > IntWidth) {
+ llvm::APSInt V(InitVal);
+ V.trunc(IntWidth);
+ V.extend(InitVal.getBitWidth());
+ if (V != InitVal)
+ Diag(ECD->getLocation(), diag::ext_enum_value_not_int,
+ InitVal.toString());
+ }
ECD->setNextDeclarator(EltList);
EltList = ECD;