Author: rsmith Date: Tue Oct 31 13:29:22 2017 New Revision: 317032 URL: http://llvm.org/viewvc/llvm-project?rev=317032&view=rev Log: Fix usage of right shift operator in fold expressions
The right shift operator was not seen as a valid operator in a fold expression, which is PR32563. Patch by Nicolas Lesser ("Blitz Rakete")! Modified: cfe/trunk/include/clang/Parse/Parser.h cfe/trunk/lib/Parse/ParseExpr.cpp cfe/trunk/test/Parser/cxx1z-fold-expressions.cpp Modified: cfe/trunk/include/clang/Parse/Parser.h URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Parse/Parser.h?rev=317032&r1=317031&r2=317032&view=diff ============================================================================== --- cfe/trunk/include/clang/Parse/Parser.h (original) +++ cfe/trunk/include/clang/Parse/Parser.h Tue Oct 31 13:29:22 2017 @@ -506,6 +506,12 @@ private: Kind == tok::annot_module_end || Kind == tok::annot_module_include; } + /// \brief Checks if the \p Level is valid for use in a fold expression. + bool isFoldOperator(prec::Level Level) const; + + /// \brief Checks if the \p Kind is a valid operator for fold expressions. + bool isFoldOperator(tok::TokenKind Kind) const; + /// \brief Initialize all pragma handlers. void initializePragmaHandlers(); Modified: cfe/trunk/lib/Parse/ParseExpr.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Parse/ParseExpr.cpp?rev=317032&r1=317031&r2=317032&view=diff ============================================================================== --- cfe/trunk/lib/Parse/ParseExpr.cpp (original) +++ cfe/trunk/lib/Parse/ParseExpr.cpp Tue Oct 31 13:29:22 2017 @@ -266,11 +266,12 @@ bool Parser::diagnoseUnknownTemplateId(E return false; } -static bool isFoldOperator(prec::Level Level) { +bool Parser::isFoldOperator(prec::Level Level) const { return Level > prec::Unknown && Level != prec::Conditional; } -static bool isFoldOperator(tok::TokenKind Kind) { - return isFoldOperator(getBinOpPrecedence(Kind, false, true)); + +bool Parser::isFoldOperator(tok::TokenKind Kind) const { + return isFoldOperator(getBinOpPrecedence(Kind, GreaterThanIsOperator, true)); } /// \brief Parse a binary expression that starts with \p LHS and has a Modified: cfe/trunk/test/Parser/cxx1z-fold-expressions.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Parser/cxx1z-fold-expressions.cpp?rev=317032&r1=317031&r2=317032&view=diff ============================================================================== --- cfe/trunk/test/Parser/cxx1z-fold-expressions.cpp (original) +++ cfe/trunk/test/Parser/cxx1z-fold-expressions.cpp Tue Oct 31 13:29:22 2017 @@ -43,3 +43,20 @@ template<typename ...T> void as_operand_ (int)(undeclared_junk + ...) + // expected-error {{undeclared}} (int)(a + ...); // expected-error {{does not contain any unexpanded}} } + +// fold-operator can be '>' or '>>'. +template <int... N> constexpr bool greaterThan() { return (N > ...); } +template <int... N> constexpr int rightShift() { return (N >> ...); } + +static_assert(greaterThan<2, 1>()); +static_assert(rightShift<10, 1>() == 5); + +template <auto V> constexpr auto Identity = V; + +// Support fold operators within templates. +template <int... N> constexpr int nestedFoldOperator() { + return Identity<(Identity<0> >> ... >> N)> + + Identity<(N >> ... >> Identity<0>)>; +} + +static_assert(nestedFoldOperator<3, 1>() == 1); _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits