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Pull in r213790 from upstream clang trunk (by Richard Smith):

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PR20228: don't retain a pointer to a vector element after the
  container has been resized.

This fixes a possible crash when compiling certain parts of libc++'s
type_traits header.
This commit is contained in:
dim 2015-01-01 22:44:02 +00:00
parent 96234b61c4
commit ec84358430
1 changed files with 4 additions and 3 deletions
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7
contrib/llvm/tools/clang/lib/Sema/SemaExprCXX.cpp
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@ -3642,12 +3642,13 @@ static bool evaluateTypeTrait(Sema &S, TypeTrait Kind, SourceLocation KWLoc,
if (T->isObjectType() || T->isFunctionType())
T = S.Context.getRValueReferenceType(T);
OpaqueArgExprs.push_back(
OpaqueValueExpr(Args[I]->getTypeLoc().getLocStart(),
OpaqueValueExpr(Args[I]->getTypeLoc().getLocStart(),
T.getNonLValueExprType(S.Context),
Expr::getValueKindForType(T)));
ArgExprs.push_back(&OpaqueArgExprs.back());
}
for (Expr &E : OpaqueArgExprs)
ArgExprs.push_back(&E);
// Perform the initialization in an unevaluated context within a SFINAE
// trap at translation unit scope.
EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated);