mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2025-04-10 18:34:23 +00:00
237c2a23b6
C++ unqualified name lookup searches template parameter scopes immediately after finishing searching the entity the parameters belong to. (Eg, for a class template, you search the template parameter scope after looking in that class template and its base classes and before looking in the scope containing the class template.) This is complicated by the fact that scope lookup within a template parameter scope looks in a different sequence of places prior to reaching the end of the declarator-id in the template declaration. We used to approximate the proper lookup rule with a hack in the scope / decl context walk inside name lookup. Now we instead compute the lookup parent for each template parameter scope. This gets the right answer and as a bonus is substantially simpler and more uniform. In order to get this right, we now make sure to enter a distinct Scope for each template parameter scope. (The fact that we didn't before was already a bug, but not really observable most of the time, since template parameters can't shadow each other.)
652 lines
18 KiB
C++
652 lines
18 KiB
C++
// RUN: %clang_cc1 -std=c++14 -Wno-unused-value -fsyntax-only -verify -verify=expected-cxx14 -fblocks %s
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// RUN: %clang_cc1 -std=c++17 -Wno-unused-value -fsyntax-only -verify -fblocks %s
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namespace std { class type_info; };
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namespace ExplicitCapture {
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class C {
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int Member;
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static void Overload(int);
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void Overload();
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virtual C& Overload(float);
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void ImplicitThisCapture() {
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[](){(void)Member;}; // expected-error {{'this' cannot be implicitly captured in this context}}
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const int var = [](){(void)Member; return 0;}(); // expected-error {{'this' cannot be implicitly captured in this context}}
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[&](){(void)Member;};
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[this](){(void)Member;};
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[this]{[this]{};};
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[]{[this]{};};// expected-error {{'this' cannot be implicitly captured in this context}}
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[]{Overload(3);};
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[]{Overload();}; // expected-error {{'this' cannot be implicitly captured in this context}}
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[]{(void)typeid(Overload());};
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[]{(void)typeid(Overload(.5f));};// expected-error {{'this' cannot be implicitly captured in this context}}
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}
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};
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void f() {
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[this] () {}; // expected-error {{'this' cannot be captured in this context}}
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}
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}
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namespace ReturnDeduction {
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void test() {
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[](){ return 1; };
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[](){ return 1; };
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[](){ return ({return 1; 1;}); };
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[](){ return ({return 'c'; 1;}); }; // expected-error {{must match previous return type}}
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[]()->int{ return 'c'; return 1; };
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[](){ return 'c'; return 1; }; // expected-error {{must match previous return type}}
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[]() { return; return (void)0; };
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[](){ return 1; return 1; };
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}
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}
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namespace ImplicitCapture {
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void test() {
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int a = 0; // expected-note 5 {{declared}}
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[]() { return a; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{begins here}}
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[&]() { return a; };
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[=]() { return a; };
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[=]() { int* b = &a; }; // expected-error {{cannot initialize a variable of type 'int *' with an rvalue of type 'const int *'}}
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[=]() { return [&]() { return a; }; };
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[]() { return [&]() { return a; }; }; // expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
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[]() { return ^{ return a; }; };// expected-error {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
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[]() { return [&a] { return a; }; }; // expected-error 2 {{variable 'a' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note 2 {{lambda expression begins here}}
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[=]() { return [&a] { return a; }; }; //
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const int b = 2;
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[]() { return b; };
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union { // expected-note {{declared}}
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int c;
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float d;
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};
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d = 3;
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[=]() { return c; }; // expected-error {{unnamed variable cannot be implicitly captured in a lambda expression}}
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__block int e; // expected-note 2{{declared}}
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[&]() { return e; }; // expected-error {{__block variable 'e' cannot be captured in a lambda expression}}
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[&e]() { return e; }; // expected-error {{__block variable 'e' cannot be captured in a lambda expression}}
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int f[10]; // expected-note {{declared}}
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[&]() { return f[2]; };
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(void) ^{ return []() { return f[2]; }; }; // expected-error {{variable 'f' cannot be implicitly captured in a lambda with no capture-default specified}} \
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// expected-note{{lambda expression begins here}}
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struct G { G(); G(G&); int a; }; // expected-note 6 {{not viable}}
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G g;
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[=]() { const G* gg = &g; return gg->a; };
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[=]() { return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error {{no matching constructor for initialization of 'G'}}
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(void)^{ return [=]{ const G* gg = &g; return gg->a; }(); }; // expected-error 2 {{no matching constructor for initialization of 'const G'}}
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const int h = a; // expected-note {{declared}}
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[]() { return h; }; // expected-error {{variable 'h' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
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// References can appear in constant expressions if they are initialized by
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// reference constant expressions.
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int i;
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int &ref_i = i; // expected-note {{declared}}
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[] { return ref_i; }; // expected-error {{variable 'ref_i' cannot be implicitly captured in a lambda with no capture-default specified}} expected-note {{lambda expression begins here}}
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static int j;
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int &ref_j = j;
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[] { return ref_j; }; // ok
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}
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}
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namespace SpecialMembers {
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void f() {
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auto a = []{}; // expected-note 2{{here}} expected-note 2{{candidate}}
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decltype(a) b; // expected-error {{no matching constructor}}
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decltype(a) c = a;
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decltype(a) d = static_cast<decltype(a)&&>(a);
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a = a; // expected-error {{copy assignment operator is implicitly deleted}}
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a = static_cast<decltype(a)&&>(a); // expected-error {{copy assignment operator is implicitly deleted}}
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}
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struct P {
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P(const P&) = delete; //expected-note {{deleted here}} // expected-cxx14-note {{deleted here}}
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};
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struct Q {
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~Q() = delete; // expected-note {{deleted here}}
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};
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struct R {
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R(const R&) = default;
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R(R&&) = delete;
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R &operator=(const R&) = delete;
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R &operator=(R&&) = delete;
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};
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void g(P &p, Q &q, R &r) {
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// FIXME: The note attached to the second error here is just amazingly bad.
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auto pp = [p]{}; // expected-error {{deleted constructor}} expected-cxx14-error {{deleted copy constructor of '(lambda}}
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// expected-cxx14-note@-1 {{copy constructor of '' is implicitly deleted because field '' has a deleted copy constructor}}
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auto qq = [q]{}; // expected-error {{deleted function}} expected-note {{because}}
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auto a = [r]{}; // expected-note 2{{here}}
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decltype(a) b = a;
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decltype(a) c = static_cast<decltype(a)&&>(a); // ok, copies R
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a = a; // expected-error {{copy assignment operator is implicitly deleted}}
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a = static_cast<decltype(a)&&>(a); // expected-error {{copy assignment operator is implicitly deleted}}
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}
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}
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namespace PR12031 {
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struct X {
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template<typename T>
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X(const T&);
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~X();
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};
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void f(int i, X x);
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void g() {
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const int v = 10;
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f(v, [](){});
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}
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}
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namespace Array {
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int &f(int *p);
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char &f(...);
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void g() {
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int n = -1;
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[=] {
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int arr[n]; // VLA
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} ();
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const int m = -1;
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[] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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[&] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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[=] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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[m] {
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int arr[m]; // expected-error{{negative size}}
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} ();
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}
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}
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void PR12248()
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{
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unsigned int result = 0;
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auto l = [&]() { ++result; };
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}
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namespace ModifyingCapture {
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void test() {
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int n = 0;
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[=] {
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n = 1; // expected-error {{cannot assign to a variable captured by copy in a non-mutable lambda}}
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};
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}
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}
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namespace VariadicPackExpansion {
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template<typename T, typename U> using Fst = T;
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template<typename...Ts> bool g(Fst<bool, Ts> ...bools);
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template<typename...Ts> bool f(Ts &&...ts) {
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return g<Ts...>([&ts] {
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if (!ts)
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return false;
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--ts;
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return true;
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} () ...);
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}
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void h() {
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int a = 5, b = 2, c = 3;
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while (f(a, b, c)) {
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}
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}
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struct sink {
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template<typename...Ts> sink(Ts &&...) {}
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};
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template<typename...Ts> void local_class() {
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sink {
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[] (Ts t) {
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struct S : Ts {
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void f(Ts t) {
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Ts &that = *this;
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that = t;
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}
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Ts g() { return *this; };
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};
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S s;
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s.f(t);
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return s;
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} (Ts()).g() ...
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};
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};
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struct X {}; struct Y {};
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template void local_class<X, Y>();
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template<typename...Ts> void nested(Ts ...ts) {
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f(
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// Each expansion of this lambda implicitly captures all of 'ts', because
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// the inner lambda also expands 'ts'.
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[&] {
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return ts + [&] { return f(ts...); } ();
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} () ...
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);
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}
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template void nested(int, int, int);
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template<typename...Ts> void nested2(Ts ...ts) { // expected-note 2{{here}}
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// Capture all 'ts', use only one.
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f([&ts...] { return ts; } ()...);
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// Capture each 'ts', use it.
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f([&ts] { return ts; } ()...);
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// Capture all 'ts', use all of them.
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f([&ts...] { return (int)f(ts...); } ());
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// Capture each 'ts', use all of them. Ill-formed. In more detail:
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//
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// We instantiate two lambdas here; the first captures ts$0, the second
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// captures ts$1. Both of them reference both ts parameters, so both are
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// ill-formed because ts can't be implicitly captured.
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//
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// FIXME: This diagnostic does not explain what's happening. We should
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// specify which 'ts' we're referring to in its diagnostic name. We should
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// also say which slice of the pack expansion is being performed in the
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// instantiation backtrace.
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f([&ts] { return (int)f(ts...); } ()...); // \
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// expected-error 2{{'ts' cannot be implicitly captured}} \
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// expected-note 2{{lambda expression begins here}}
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}
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template void nested2(int); // ok
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template void nested2(int, int); // expected-note {{in instantiation of}}
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}
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namespace PR13860 {
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void foo() {
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auto x = PR13860UndeclaredIdentifier(); // expected-error {{use of undeclared identifier 'PR13860UndeclaredIdentifier'}}
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auto y = [x]() { };
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static_assert(sizeof(y), "");
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}
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}
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namespace PR13854 {
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auto l = [](void){};
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}
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namespace PR14518 {
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auto f = [](void) { return __func__; }; // no-warning
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}
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namespace PR16708 {
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auto L = []() {
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auto ret = 0;
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return ret;
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return 0;
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};
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}
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namespace TypeDeduction {
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struct S {};
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void f() {
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const S s {};
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S &&t = [&] { return s; } ();
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#if __cplusplus > 201103L
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S &&u = [&] () -> auto { return s; } ();
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#endif
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}
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}
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namespace lambdas_in_NSDMIs {
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template<class T>
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struct L {
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T t{};
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T t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
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};
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L<int> l;
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namespace non_template {
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struct L {
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int t = 0;
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int t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
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};
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L l;
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}
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}
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// PR18477: don't try to capture 'this' from an NSDMI encountered while parsing
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// a lambda.
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namespace NSDMIs_in_lambdas {
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template<typename T> struct S { int a = 0; int b = a; };
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void f() { []() { S<int> s; }; }
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auto x = []{ struct S { int n, m = n; }; };
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auto y = [&]{ struct S { int n, m = n; }; }; // expected-error {{non-local lambda expression cannot have a capture-default}}
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void g() { auto z = [&]{ struct S { int n, m = n; }; }; }
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}
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namespace CaptureIncomplete {
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struct Incomplete; // expected-note 2{{forward decl}}
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void g(const Incomplete &a);
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void f(Incomplete &a) {
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(void) [a] {}; // expected-error {{incomplete}}
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(void) [&a] {};
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(void) [=] { g(a); }; // expected-error {{incomplete}}
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(void) [&] { f(a); };
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}
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}
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namespace CaptureAbstract {
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struct S {
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virtual void f() = 0; // expected-note {{unimplemented}}
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int n = 0;
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};
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struct T : S {
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constexpr T() {}
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void f();
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};
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void f() {
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constexpr T t = T();
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S &s = const_cast<T&>(t);
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// FIXME: Once we properly compute odr-use per DR712, this should be
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// accepted (and should not capture 's').
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[=] { return s.n; }; // expected-error {{abstract}}
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}
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}
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namespace PR18128 {
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auto l = [=]{}; // expected-error {{non-local lambda expression cannot have a capture-default}}
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struct S {
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int n;
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int (*f())[true ? 1 : ([=]{ return n; }(), 0)];
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// expected-error@-1 {{non-local lambda expression cannot have a capture-default}}
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// expected-error@-2 {{invalid use of non-static data member 'n'}}
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// expected-cxx14-error@-3 {{a lambda expression may not appear inside of a constant expression}}
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int g(int k = ([=]{ return n; }(), 0));
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// expected-error@-1 {{non-local lambda expression cannot have a capture-default}}
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// expected-error@-2 {{invalid use of non-static data member 'n'}}
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int a = [=]{ return n; }(); // ok
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int b = [=]{ return [=]{ return n; }(); }(); // ok
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int c = []{ int k = 0; return [=]{ return k; }(); }(); // ok
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int d = []{ return [=]{ return n; }(); }(); // expected-error {{'this' cannot be implicitly captured in this context}}
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};
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}
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namespace PR18473 {
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template<typename T> void f() {
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T t(0);
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(void) [=]{ int n = t; }; // expected-error {{deleted}}
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}
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template void f<int>();
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struct NoCopy {
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NoCopy(int);
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NoCopy(const NoCopy &) = delete; // expected-note {{deleted}}
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operator int() const;
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};
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template void f<NoCopy>(); // expected-note {{instantiation}}
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}
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void PR19249() {
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auto x = [&x]{}; // expected-error {{cannot appear in its own init}}
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}
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namespace PR20731 {
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template <class L, int X = sizeof(L)>
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void Job(L l);
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template <typename... Args>
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void Logger(Args &&... args) {
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auto len = Invalid_Function((args)...);
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// expected-error@-1 {{use of undeclared identifier 'Invalid_Function'}}
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Job([len]() {});
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}
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void GetMethod() {
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Logger();
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// expected-note@-1 {{in instantiation of function template specialization 'PR20731::Logger<>' requested here}}
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}
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template <typename T>
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struct A {
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T t;
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// expected-error@-1 {{field has incomplete type 'void'}}
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};
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template <typename F>
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void g(F f) {
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auto a = A<decltype(f())>{};
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// expected-note@-1 {{in instantiation of template class 'PR20731::A<void>' requested here}}
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auto xf = [a, f]() {};
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int x = sizeof(xf);
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};
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void f() {
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g([] {});
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// expected-note-re@-1 {{in instantiation of function template specialization 'PR20731::g<(lambda at {{.*}}>' requested here}}
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}
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template <class _Rp> struct function {
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template <class _Fp>
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function(_Fp) {
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static_assert(sizeof(_Fp) > 0, "Type must be complete.");
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}
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};
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template <typename T> void p(T t) {
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auto l = some_undefined_function(t);
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// expected-error@-1 {{use of undeclared identifier 'some_undefined_function'}}
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function<void()>(([l]() {}));
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}
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void q() { p(0); }
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// expected-note@-1 {{in instantiation of function template specialization 'PR20731::p<int>' requested here}}
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}
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namespace lambda_in_default_mem_init {
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template<typename T> void f() {
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struct S { int n = []{ return 0; }(); };
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}
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template void f<int>();
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template<typename T> void g() {
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struct S { int n = [](int n){ return n; }(0); };
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}
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template void g<int>();
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}
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namespace error_in_transform_prototype {
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template<class T>
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void f(T t) {
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// expected-error@+2 {{type 'int' cannot be used prior to '::' because it has no members}}
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// expected-error@+1 {{no member named 'ns' in 'error_in_transform_prototype::S'}}
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auto x = [](typename T::ns::type &k) {};
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}
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class S {};
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void foo() {
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f(5); // expected-note {{requested here}}
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f(S()); // expected-note {{requested here}}
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}
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}
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namespace PR21857 {
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template<typename Fn> struct fun : Fn {
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fun() = default;
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using Fn::operator();
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};
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template<typename Fn> fun<Fn> wrap(Fn fn);
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auto x = wrap([](){});
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}
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|
|
|
namespace PR13987 {
|
|
class Enclosing {
|
|
void Method(char c = []()->char {
|
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int d = []()->int {
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|
struct LocalClass {
|
|
int Method() { return 0; }
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|
};
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|
return 0;
|
|
}();
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|
return d; }()
|
|
);
|
|
};
|
|
}
|
|
|
|
namespace PR23860 {
|
|
template <class> struct A {
|
|
void f(int x = []() {
|
|
struct B {
|
|
void g() {}
|
|
};
|
|
return 0;
|
|
}());
|
|
};
|
|
|
|
int main() {
|
|
}
|
|
|
|
A<int> a;
|
|
}
|
|
|
|
// rdar://22032373
|
|
namespace rdar22032373 {
|
|
void foo() {
|
|
auto blk = [](bool b) {
|
|
if (b)
|
|
return undeclared_error; // expected-error {{use of undeclared identifier}}
|
|
return 0;
|
|
};
|
|
}
|
|
}
|
|
|
|
namespace nested_lambda {
|
|
template <int N>
|
|
class S {};
|
|
|
|
void foo() {
|
|
const int num = 18;
|
|
auto outer = []() {
|
|
auto inner = [](S<num> &X) {};
|
|
};
|
|
}
|
|
}
|
|
|
|
namespace PR27994 {
|
|
struct A { template <class T> A(T); };
|
|
|
|
template <class T>
|
|
struct B {
|
|
int x;
|
|
A a = [&] { int y = x; };
|
|
A b = [&] { [&] { [&] { int y = x; }; }; };
|
|
A d = [&](auto param) { int y = x; };
|
|
A e = [&](auto param) { [&] { [&](auto param2) { int y = x; }; }; };
|
|
};
|
|
|
|
B<int> b;
|
|
|
|
template <class T> struct C {
|
|
struct D {
|
|
int x;
|
|
A f = [&] { int y = x; };
|
|
};
|
|
};
|
|
|
|
int func() {
|
|
C<int> a;
|
|
decltype(a)::D b;
|
|
}
|
|
}
|
|
|
|
namespace PR30566 {
|
|
int name1; // expected-note {{'name1' declared here}}
|
|
|
|
struct S1 {
|
|
template<class T>
|
|
S1(T t) { s = sizeof(t); }
|
|
int s;
|
|
};
|
|
|
|
void foo1() {
|
|
auto s0 = S1{[name=]() {}}; // expected-error 2 {{expected expression}}
|
|
auto s1 = S1{[name=name]() {}}; // expected-error {{use of undeclared identifier 'name'; did you mean 'name1'?}}
|
|
}
|
|
}
|
|
|
|
namespace PR25627_dont_odr_use_local_consts {
|
|
|
|
template<int> struct X {};
|
|
|
|
void foo() {
|
|
const int N = 10;
|
|
(void) [] { X<N> x; };
|
|
}
|
|
}
|
|
|
|
namespace ConversionOperatorDoesNotHaveDeducedReturnType {
|
|
auto x = [](int){};
|
|
auto y = [](auto &v) -> void { v.n = 0; };
|
|
using T = decltype(x);
|
|
using U = decltype(y);
|
|
using ExpectedTypeT = void (*)(int);
|
|
template<typename T>
|
|
using ExpectedTypeU = void (*)(T&);
|
|
|
|
struct X {
|
|
#if __cplusplus > 201402L
|
|
friend constexpr auto T::operator()(int) const;
|
|
friend constexpr T::operator ExpectedTypeT() const noexcept;
|
|
|
|
template<typename T>
|
|
friend constexpr void U::operator()(T&) const;
|
|
// FIXME: This should not match; the return type is specified as behaving
|
|
// "as if it were a decltype-specifier denoting the return type of
|
|
// [operator()]", which is not equivalent to this alias template.
|
|
template<typename T>
|
|
friend constexpr U::operator ExpectedTypeU<T>() const noexcept;
|
|
#else
|
|
friend auto T::operator()(int) const;
|
|
friend T::operator ExpectedTypeT() const;
|
|
|
|
template<typename T>
|
|
friend void U::operator()(T&) const;
|
|
// FIXME: This should not match, as above.
|
|
template<typename T>
|
|
friend U::operator ExpectedTypeU<T>() const;
|
|
#endif
|
|
|
|
private:
|
|
int n;
|
|
};
|
|
|
|
// Should be OK: lambda's call operator is a friend.
|
|
void use(X &x) { y(x); }
|
|
|
|
// This used to crash in return type deduction for the conversion opreator.
|
|
struct A { int n; void f() { +[](decltype(n)) {}; } };
|
|
}
|
|
|
|
namespace TypoCorrection {
|
|
template <typename T> struct X {};
|
|
// expected-note@-1 {{template parameter is declared here}}
|
|
|
|
template <typename T>
|
|
void Run(const int& points) {
|
|
// expected-note@-1 {{'points' declared here}}
|
|
auto outer_lambda = []() {
|
|
auto inner_lambda = [](const X<Points>&) {};
|
|
// expected-error@-1 {{use of undeclared identifier 'Points'; did you mean 'points'?}}
|
|
// expected-error@-2 {{template argument for template type parameter must be a type}}
|
|
};
|
|
}
|
|
}
|
|
|
|
void operator_parens() {
|
|
[&](int x){ operator()(); }(0); // expected-error {{undeclared 'operator()'}}
|
|
}
|