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Fix a few cases where enum constant handling was using 

ASTContext::getTypeSize() rather than ASTContext::getIntWidth() for
the width of an integral type. The former includes padding for bools
(to the target's size) while the latter does not, so we woud end up
zero-extending bools to the target width when we shouldn't. Fixes a
crash-on-valid in the included test.

llvm-svn: 101372
This commit is contained in:
Douglas Gregor 2010-04-15 15:53:31 +00:00
parent ff3c8b7eaf
commit c1cf814c8b
2 changed files with 10 additions and 6 deletions
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6
clang/lib/Sema/SemaDecl.cpp
View File

@ -6006,7 +6006,7 @@ static bool isRepresentableIntegerValue(ASTContext &Context,
llvm::APSInt &Value,
QualType T) {
assert(T->isIntegralType() && "Integral type required!");
unsigned BitWidth = Context.getTypeSize(T);
unsigned BitWidth = Context.getIntWidth(T);
if (Value.isUnsigned() || Value.isNonNegative())
return Value.getActiveBits() < BitWidth;
@ -6139,7 +6139,7 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
// value, then increment.
EnumVal = LastEnumConst->getInitVal();
EnumVal.setIsSigned(EltTy->isSignedIntegerType());
EnumVal.zextOrTrunc(Context.getTypeSize(EltTy));
EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
++EnumVal;
// If we're not in C++, diagnose the overflow of enumerator values,
@ -6161,7 +6161,7 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
if (!EltTy->isDependentType()) {
// Make the enumerator value match the signedness and size of the
// enumerator's type.
EnumVal.zextOrTrunc(Context.getTypeSize(EltTy));
EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
EnumVal.setIsSigned(EltTy->isSignedIntegerType());
}

10
clang/test/SemaCXX/constant-expression.cpp
View File

@ -1,5 +1,4 @@
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
// C++ [expr.const]p1:
// In several places, C++ requires expressions that evaluate to an integral
// or enumeration constant: as array bounds, as case expressions, as
@ -79,5 +78,10 @@ template <int itval, Enum etval> struct C {
};
template struct C<1, eval>;
//template struct C<cval, ceval>;
//template struct C<Struct::sval, Struct::seval>;
template struct C<cval, ceval>;
template struct C<Struct::sval, Struct::seval>;
enum {
a = sizeof(int) == 8,
b = a? 8 : 4
};