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clang-p2996/clang/test/SemaTemplate/deduction-guide.cpp
Richard Smith a6308c0ad9 When performing a substitution into a dependent alias template, mark the 
outer levels as retained rather than omitting their arguments.

This better reflects what's going on (we're performing a substitution
while still inside a template), and in theory is more correct, but I've
not found a testcase where it matters in practice (largely because we
don't allow alias templates to be declared inside a function).

Fixed AST dumping of SubstNonTypeTemplateParm[Pack]Expr to demonstrate
that we're properly substituting through dependent alias templates. (We
can't deduce properly through these yet, but we can at least produce the
right input to template argument deduction.)

No functionality change intended.
2020-06-23 14:43:04 -07:00

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// RUN: %clang_cc1 -std=c++2a -verify -ast-dump -ast-dump-decl-types -ast-dump-filter "deduction guide" %s | FileCheck %s --strict-whitespace
template<auto ...> struct X {};
template<template<typename X, X> typename> struct Y {};
template<typename ...> struct Z {};
template<typename T, typename ...Ts> struct A {
template<Ts ...Ns, T *...Ps> A(X<Ps...>, Ts (*...qs)[Ns]);
};
int arr1[3], arr2[3];
short arr3[4];
A a(X<&arr1, &arr2>{}, &arr1, &arr2, &arr3);
using AT = decltype(a);
using AT = A<int[3], int, int, short>;
// CHECK-LABEL: Dumping <deduction guide for A>:
// CHECK: FunctionTemplateDecl
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 T
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 1 ... Ts
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'Ts...' depth 0 index 2 ... Ns
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'T *' depth 0 index 3 ... Ps
// CHECK: |-CXXDeductionGuideDecl
// CHECK: | |-ParmVarDecl {{.*}} 'X<Ps...>'
// CHECK: | `-ParmVarDecl {{.*}} 'Ts (*)[Ns]...' pack
// CHECK: `-CXXDeductionGuideDecl
// CHECK: |-TemplateArgument type 'int [3]'
// CHECK: |-TemplateArgument pack
// CHECK: | |-TemplateArgument type 'int'
// CHECK: | |-TemplateArgument type 'int'
// CHECK: | `-TemplateArgument type 'short'
// CHECK: |-TemplateArgument pack
// CHECK: | |-TemplateArgument integral 3
// CHECK: | |-TemplateArgument integral 3
// CHECK: | `-TemplateArgument integral 4
// CHECK: |-TemplateArgument pack
// CHECK: | |-TemplateArgument decl
// CHECK: | | `-Var {{.*}} 'arr1' 'int [3]'
// CHECK: | `-TemplateArgument decl
// CHECK: | `-Var {{.*}} 'arr2' 'int [3]'
// CHECK: |-ParmVarDecl {{.*}} 'X<&arr1, &arr2>':'X<&arr1, &arr2>'
// CHECK: |-ParmVarDecl {{.*}} 'int (*)[3]'
// CHECK: |-ParmVarDecl {{.*}} 'int (*)[3]'
// CHECK: `-ParmVarDecl {{.*}} 'short (*)[4]'
// CHECK: FunctionProtoType {{.*}} 'auto (X<Ps...>, Ts (*)[Ns]...) -> A<T, Ts...>' dependent trailing_return
// CHECK: |-InjectedClassNameType {{.*}} 'A<T, Ts...>' dependent
// CHECK: |-TemplateSpecializationType {{.*}} 'X<Ps...>' dependent X
// CHECK: | `-TemplateArgument expr
// CHECK: | `-PackExpansionExpr {{.*}} 'T *'
// CHECK: | `-DeclRefExpr {{.*}} 'T *' NonTypeTemplateParm {{.*}} 'Ps' 'T *'
// CHECK: `-PackExpansionType {{.*}} 'Ts (*)[Ns]...' dependent
// CHECK: `-PointerType {{.*}} 'Ts (*)[Ns]' dependent contains_unexpanded_pack
// CHECK: `-ParenType {{.*}} 'Ts [Ns]' sugar dependent contains_unexpanded_pack
// CHECK: `-DependentSizedArrayType {{.*}} 'Ts [Ns]' dependent contains_unexpanded_pack
// CHECK: |-TemplateTypeParmType {{.*}} 'Ts' dependent contains_unexpanded_pack depth 0 index 1 pack
// CHECK: | `-TemplateTypeParm {{.*}} 'Ts'
// CHECK: `-DeclRefExpr {{.*}} 'Ts' NonTypeTemplateParm {{.*}} 'Ns' 'Ts...'
template<typename T, T V> struct B {
template<typename U, U W> B(X<W, V>);
};
B b(X<nullptr, 'x'>{});
using BT = decltype(b);
using BT = B<char, 'x'>;
// CHECK-LABEL: Dumping <deduction guide for B>:
// CHECK: FunctionTemplateDecl
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 T
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'T' depth 0 index 1 V
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 2 U
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'type-parameter-0-2' depth 0 index 3 W
// CHECK: |-CXXDeductionGuideDecl {{.*}} 'auto (X<W, V>) -> B<T, V>'
// CHECK: | `-ParmVarDecl {{.*}} 'X<W, V>'
// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (X<nullptr, 'x'>) -> B<char, 'x'>'
// CHECK: |-TemplateArgument type 'char'
// CHECK: |-TemplateArgument integral 120
// CHECK: |-TemplateArgument type 'nullptr_t'
// CHECK: |-TemplateArgument nullptr
// CHECK: `-ParmVarDecl {{.*}} 'X<nullptr, 'x'>':'X<nullptr, 'x'>'
// CHECK: FunctionProtoType {{.*}} 'auto (X<W, V>) -> B<T, V>' dependent trailing_return
// CHECK: |-InjectedClassNameType {{.*}} 'B<T, V>' dependent
// CHECK: `-TemplateSpecializationType {{.*}} 'X<W, V>' dependent X
// CHECK: |-TemplateArgument expr
// CHECK: | `-DeclRefExpr {{.*}} 'type-parameter-0-2' NonTypeTemplateParm {{.*}} 'W' 'type-parameter-0-2'
// CHECK: `-TemplateArgument expr
// CHECK: `-DeclRefExpr {{.*}} 'T' NonTypeTemplateParm {{.*}} 'V' 'T'
template<typename A> struct C {
template<template<typename X, X> typename T, typename U, U V = 0> C(A, Y<T>, U);
};
C c(1, Y<B>{}, 2);
using CT = decltype(c);
using CT = C<int>;
// CHECK-LABEL: Dumping <deduction guide for C>:
// CHECK: FunctionTemplateDecl
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 A
// CHECK: |-TemplateTemplateParmDecl {{.*}} depth 0 index 1 T
// CHECK: | |-TemplateTypeParmDecl {{.*}} typename depth 1 index 0 X
// CHECK: | `-NonTypeTemplateParmDecl {{.*}} 'X' depth 1 index 1
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 2 U
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'type-parameter-0-2' depth 0 index 3 V
// CHECK: | `-TemplateArgument expr
// CHECK: | `-IntegerLiteral {{.*}} 'int' 0
// CHECK: |-CXXDeductionGuideDecl {{.*}} 'auto (A, Y<>, type-parameter-0-2) -> C<A>'
// CHECK: | |-ParmVarDecl {{.*}} 'A'
// CHECK: | |-ParmVarDecl {{.*}} 'Y<>'
// CHECK: | `-ParmVarDecl {{.*}} 'type-parameter-0-2'
// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (int, Y<B>, int) -> C<int>'
// CHECK: |-TemplateArgument type 'int'
// CHECK: |-TemplateArgument template B
// CHECK: |-TemplateArgument type 'int'
// CHECK: |-TemplateArgument integral 0
// CHECK: |-ParmVarDecl {{.*}} 'int':'int'
// CHECK: |-ParmVarDecl {{.*}} 'Y<B>':'Y<B>'
// CHECK: `-ParmVarDecl {{.*}} 'int':'int'
// CHECK: FunctionProtoType {{.*}} 'auto (A, Y<>, type-parameter-0-2) -> C<A>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'C<A>' dependent
// CHECK: |-TemplateTypeParmType {{.*}} 'A' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'A'
// CHECK: |-TemplateSpecializationType {{.*}} 'Y<>' dependent Y
// CHECK: | `-TemplateArgument template
// CHECK: `-TemplateTypeParmType {{.*}} 'type-parameter-0-2' dependent depth 0 index 2
template<typename ...T> struct D { // expected-note {{candidate}}
template<typename... U> using B = int(int (*...p)(T, U));
template<typename U1, typename U2> D(B<U1, U2>*); // expected-note {{candidate}}
};
int f(int(int, int), int(int, int));
// FIXME: We can't deduce this because we can't deduce through a
// SubstTemplateTypeParmPackType.
D d = f; // expected-error {{no viable}}
using DT = decltype(d);
using DT = D<int, int>;
// CHECK-LABEL: Dumping <deduction guide for D>:
// CHECK: FunctionTemplateDecl
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 ... T
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 1 U1
// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 2 U2
// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (B<type-parameter-0-1, type-parameter-0-2> *) -> D<T...>'
// CHECK: `-ParmVarDecl {{.*}} 'B<type-parameter-0-1, type-parameter-0-2> *'
// CHECK: FunctionProtoType {{.*}} 'auto (B<type-parameter-0-1, type-parameter-0-2> *) -> D<T...>' dependent trailing_return
// CHECK: |-InjectedClassNameType {{.*}} 'D<T...>' dependent
// CHECK: `-PointerType {{.*}} 'B<type-parameter-0-1, type-parameter-0-2> *' dependent
// CHECK: `-TemplateSpecializationType {{.*}} 'B<type-parameter-0-1, type-parameter-0-2>' sugar dependent alias B
// CHECK: |-TemplateArgument type 'type-parameter-0-1'
// CHECK: |-TemplateArgument type 'type-parameter-0-2'
// CHECK: `-FunctionProtoType {{.*}} 'int (int (*)(T, U)...)' dependent cdecl
// CHECK: |-BuiltinType {{.*}} 'int'
// CHECK: `-PackExpansionType {{.*}} 'int (*)(T, U)...' dependent expansions 2
// CHECK: `-PointerType {{.*}} 'int (*)(T, U)' dependent contains_unexpanded_pack
// CHECK: `-ParenType {{.*}} 'int (T, U)' sugar dependent contains_unexpanded_pack
// CHECK: `-FunctionProtoType {{.*}} 'int (T, U)' dependent contains_unexpanded_pack cdecl
// CHECK: |-BuiltinType {{.*}} 'int'
// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent contains_unexpanded_pack depth 0 index 0 pack
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-SubstTemplateTypeParmPackType {{.*}} 'U' dependent contains_unexpanded_pack
// CHECK: |-TemplateTypeParmType {{.*}} 'U' dependent contains_unexpanded_pack depth 1 index 0 pack
// CHECK: | `-TemplateTypeParm {{.*}} 'U'
// CHECK: `-TemplateArgument pack
// CHECK: |-TemplateArgument type 'type-parameter-0-1'
// CHECK-NOT: Subst
// CHECK: | `-TemplateTypeParmType
// CHECK: `-TemplateArgument type 'type-parameter-0-2'
// CHECK-NOT: Subst
// CHECK: `-TemplateTypeParmType
template<int ...N> struct E { // expected-note {{candidate}}
template<int ...M> using B = Z<X<N, M>...>;
template<int M1, int M2> E(B<M1, M2>); // expected-note {{candidate}}
};
// FIXME: We can't deduce this because we can't deduce through a
// SubstNonTypeTemplateParmPackExpr.
E e = Z<X<1, 2>, X<3, 4>>(); // expected-error {{no viable}}
using ET = decltype(e);
using ET = E<1, 3>;
// CHECK-LABEL: Dumping <deduction guide for E>:
// CHECK: FunctionTemplateDecl
// CHECK: |-NonTypeTemplateParmDecl [[N:0x[0-9a-f]*]] {{.*}} 'int' depth 0 index 0 ... N
// CHECK: |-NonTypeTemplateParmDecl [[M1:0x[0-9a-f]*]] {{.*}} 'int' depth 0 index 1 M1
// CHECK: |-NonTypeTemplateParmDecl [[M2:0x[0-9a-f]*]] {{.*}} 'int' depth 0 index 2 M2
// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (B<M1, M2>) -> E<N...>'
// CHECK: `-ParmVarDecl {{.*}} 'B<M1, M2>':'Z<X<N, M>...>'
// CHECK: FunctionProtoType {{.*}} 'auto (B<M1, M2>) -> E<N...>' dependent trailing_return
// CHECK: |-InjectedClassNameType {{.*}} 'E<N...>' dependent
// CHECK: `-TemplateSpecializationType {{.*}} 'B<M1, M2>' sugar dependent alias B
// CHECK: |-TemplateArgument expr
// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm {{.*}} 'M1' 'int'
// CHECK: |-TemplateArgument expr
// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm {{.*}} 'M2' 'int'
// CHECK: `-TemplateSpecializationType {{.*}} 'Z<X<N, M>...>' dependent Z
// CHECK: `-TemplateArgument type 'X<N, M>...'
// CHECK: `-PackExpansionType {{.*}} 'X<N, M>...' dependent expansions 2
// CHECK: `-TemplateSpecializationType {{.*}} 'X<N, M>' dependent contains_unexpanded_pack X
// CHECK: |-TemplateArgument expr
// CHECK-NOT: Subst
// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm [[N]] 'N' 'int'
// CHECK: `-TemplateArgument expr
// CHECK: `-SubstNonTypeTemplateParmPackExpr {{.*}} 'int'
// CHECK: |-NonTypeTemplateParmDecl {{.*}} referenced 'int' depth 1 index 0 ... M
// CHECK: `-TemplateArgument pack
// CHECK: |-TemplateArgument expr
// CHECK-NOT: Subst
// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm [[M1]] 'M1' 'int'
// CHECK: `-TemplateArgument expr
// CHECK-NOT: Subst
// CHECK: `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm [[M2]] 'M2' 'int'
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