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73c3c21fae
Rather than attempting to compare whether the previous and current top of context stack are "equal" (which fails for a number of reasons, such as the context stack entries containing pointers to objects on the stack, or reaching the same "top of stack" entry through two different paths), track the depth of context stack at which we last emitted a note and invalidate it when we pop the context stack to less than that depth. This causes us to emit some missing "in instantiation of" notes and to stop emitting redundant "in instantiation of" stacks matching the previous stack in rare cases. llvm-svn: 295921
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
// This is a test for an egregious hack in Clang that works around
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// an issue with GCC's <utility> implementation. std::pair::swap
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// has an exception specification that makes an unqualified call to
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// swap. This is invalid, because it ends up calling itself with
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// the wrong number of arguments.
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//
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// The same problem afflicts a bunch of other class templates. Those
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// affected are array, pair, priority_queue, stack, and queue.
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array -DPR28423
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=pair
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=priority_queue
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=stack
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=queue
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//
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array -DNAMESPACE=__debug
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array -DNAMESPACE=__profile
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// MSVC's standard library uses a very similar pattern that relies on delayed
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// parsing of exception specifications.
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//
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array -DMSVC
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#ifdef BE_THE_HEADER
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#pragma GCC system_header
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#ifdef PR28423
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using namespace std;
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#endif
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namespace std {
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template<typename T> void swap(T &, T &);
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template<typename T> void do_swap(T &a, T &b) noexcept(noexcept(swap(a, b))) {
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swap(a, b);
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}
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#ifdef NAMESPACE
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namespace NAMESPACE {
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#define STD_CLASS std::NAMESPACE::CLASS
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#else
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#define STD_CLASS std::CLASS
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#endif
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template<typename A, typename B> struct CLASS {
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#ifdef MSVC
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void swap(CLASS &other) noexcept(noexcept(do_swap(member, other.member)));
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#endif
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A member;
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#ifndef MSVC
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void swap(CLASS &other) noexcept(noexcept(swap(member, other.member)));
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#endif
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};
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// template<typename T> void do_swap(T &, T &);
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// template<typename A> struct vector {
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// void swap(vector &other) noexcept(noexcept(do_swap(member, other.member)));
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// A member;
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// };
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#ifdef NAMESPACE
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}
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#endif
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}
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#else
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#define BE_THE_HEADER
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#include __FILE__
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struct X {};
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using PX = STD_CLASS<X, X>;
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using PI = STD_CLASS<int, int>;
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void swap(X &, X &) noexcept;
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PX px;
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PI pi;
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static_assert(noexcept(px.swap(px)), "");
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static_assert(!noexcept(pi.swap(pi)), "");
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namespace sad {
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template<typename T> void swap(T &, T &);
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template<typename A, typename B> struct CLASS {
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void swap(CLASS &other) noexcept(noexcept(swap(*this, other))); // expected-error {{too many arguments}} expected-note {{declared here}}
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// expected-error@-1{{uses itself}} expected-note@-1{{in instantiation of}}
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};
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CLASS<int, int> pi;
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static_assert(!noexcept(pi.swap(pi)), ""); // expected-note 2{{in instantiation of exception specification for 'swap'}}
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}
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#endif
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