27becf0c3c
For alias templates, our current way of constructing their aggregate deduction guides deviates from the standard approach. We should align it with how we handle implicit deduction guides. This patch has a refactoring change which pulls the construction logic out from `DeclareImplicitDeductionGuidesForTypeAlia` and reusing it for building aggregate deduction guides.
298 lines
14 KiB
C++
298 lines
14 KiB
C++
// RUN: %clang_cc1 -std=c++2a -verify -ast-dump -ast-dump-decl-types -ast-dump-filter "deduction guide" %s | FileCheck %s --strict-whitespace
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template<auto ...> struct X {};
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template<template<typename X, X> typename> struct Y {};
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template<typename ...> struct Z {};
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template<typename T, typename ...Ts> struct A {
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template<Ts ...Ns, T *...Ps> A(X<Ps...>, Ts (*...qs)[Ns]);
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};
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int arr1[3], arr2[3];
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short arr3[4];
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A a(X<&arr1, &arr2>{}, &arr1, &arr2, &arr3);
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using AT = decltype(a);
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using AT = A<int[3], int, int, short>;
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// CHECK-LABEL: Dumping <deduction guide for A>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 T
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 1 ... Ts
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'Ts...' depth 0 index 2 ... Ns
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'T *' depth 0 index 3 ... Ps
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// CHECK: |-CXXDeductionGuideDecl
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// CHECK: | |-ParmVarDecl {{.*}} 'X<Ps...>'
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// CHECK: | `-ParmVarDecl {{.*}} 'Ts (*)[Ns]...' pack
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// CHECK: `-CXXDeductionGuideDecl
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// CHECK: |-TemplateArgument type 'int[3]'
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// CHECK: |-TemplateArgument pack
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// CHECK: | |-TemplateArgument type 'int'
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// CHECK: | |-TemplateArgument type 'int'
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// CHECK: | `-TemplateArgument type 'short'
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// CHECK: |-TemplateArgument pack
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// CHECK: | |-TemplateArgument integral 3
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// CHECK: | |-TemplateArgument integral 3
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// CHECK: | `-TemplateArgument integral 4
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// CHECK: |-TemplateArgument pack
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// CHECK: | |-TemplateArgument decl
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// CHECK: | | `-Var {{.*}} 'arr1' 'int[3]'
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// CHECK: | `-TemplateArgument decl
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// CHECK: | `-Var {{.*}} 'arr2' 'int[3]'
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// CHECK: |-ParmVarDecl {{.*}} 'X<&arr1, &arr2>'
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// CHECK: |-ParmVarDecl {{.*}} 'int (*)[3]'
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// CHECK: |-ParmVarDecl {{.*}} 'int (*)[3]'
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// CHECK: `-ParmVarDecl {{.*}} 'short (*)[4]'
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// CHECK: FunctionProtoType {{.*}} 'auto (X<Ps...>, Ts (*)[Ns]...) -> A<T, Ts...>' dependent trailing_return
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// CHECK: |-InjectedClassNameType {{.*}} 'A<T, Ts...>' dependent
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// CHECK: |-ElaboratedType {{.*}} 'X<Ps...>' sugar dependent
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// CHECK: | `-TemplateSpecializationType {{.*}} 'X<Ps...>' dependent X
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// CHECK: | `-TemplateArgument expr
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// CHECK: | `-PackExpansionExpr {{.*}} 'T *'
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// CHECK: | `-DeclRefExpr {{.*}} 'T *' NonTypeTemplateParm {{.*}} 'Ps' 'T *'
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// CHECK: `-PackExpansionType {{.*}} 'Ts (*)[Ns]...' dependent
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// CHECK: `-PointerType {{.*}} 'Ts (*)[Ns]' dependent contains_unexpanded_pack
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// CHECK: `-ParenType {{.*}} 'Ts[Ns]' sugar dependent contains_unexpanded_pack
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// CHECK: `-DependentSizedArrayType {{.*}} 'Ts[Ns]' dependent contains_unexpanded_pack
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// CHECK: |-TemplateTypeParmType {{.*}} 'Ts' dependent contains_unexpanded_pack depth 0 index 1 pack
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// CHECK: | `-TemplateTypeParm {{.*}} 'Ts'
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// CHECK: `-DeclRefExpr {{.*}} 'Ts' NonTypeTemplateParm {{.*}} 'Ns' 'Ts...'
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template<typename T, T V> struct B {
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template<typename U, U W> B(X<W, V>);
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};
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B b(X<nullptr, 'x'>{});
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using BT = decltype(b);
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using BT = B<char, 'x'>;
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// CHECK-LABEL: Dumping <deduction guide for B>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 T
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'T' depth 0 index 1 V
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 2 U
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'type-parameter-0-2' depth 0 index 3 W
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// CHECK: |-CXXDeductionGuideDecl {{.*}} 'auto (X<W, V>) -> B<T, V>'
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// CHECK: | `-ParmVarDecl {{.*}} 'X<W, V>'
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// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (X<nullptr, 'x'>) -> B<char, 'x'>'
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// CHECK: |-TemplateArgument type 'char'
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// CHECK: |-TemplateArgument integral 120
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// CHECK: |-TemplateArgument type 'std::nullptr_t'
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// CHECK: |-TemplateArgument nullptr
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// CHECK: `-ParmVarDecl {{.*}} 'X<nullptr, 'x'>'
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// CHECK: FunctionProtoType {{.*}} 'auto (X<W, V>) -> B<T, V>' dependent trailing_return
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// CHECK: |-InjectedClassNameType {{.*}} 'B<T, V>' dependent
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// CHECK: `-TemplateSpecializationType {{.*}} 'X<W, V>' dependent X
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// CHECK: |-TemplateArgument expr
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// CHECK: | `-DeclRefExpr {{.*}} 'type-parameter-0-2' NonTypeTemplateParm {{.*}} 'W' 'type-parameter-0-2'
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// CHECK: `-TemplateArgument expr
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// CHECK: `-DeclRefExpr {{.*}} 'T' NonTypeTemplateParm {{.*}} 'V' 'T'
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template<typename A> struct C {
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template<template<typename X, X> typename T, typename U, U V = 0> C(A, Y<T>, U);
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};
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C c(1, Y<B>{}, 2);
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using CT = decltype(c);
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using CT = C<int>;
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// CHECK-LABEL: Dumping <deduction guide for C>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 A
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// CHECK: |-TemplateTemplateParmDecl {{.*}} depth 0 index 1 T
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// CHECK: | |-TemplateTypeParmDecl {{.*}} typename depth 1 index 0 X
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// CHECK: | `-NonTypeTemplateParmDecl {{.*}} 'X' depth 1 index 1
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 2 U
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'type-parameter-0-2' depth 0 index 3 V
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// CHECK: | `-TemplateArgument expr
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// CHECK: | `-IntegerLiteral {{.*}} 'int' 0
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// CHECK: |-CXXDeductionGuideDecl {{.*}} 'auto (A, Y<>, type-parameter-0-2) -> C<A>'
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// CHECK: | |-ParmVarDecl {{.*}} 'A'
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// CHECK: | |-ParmVarDecl {{.*}} 'Y<>'
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// CHECK: | `-ParmVarDecl {{.*}} 'type-parameter-0-2'
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// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (int, Y<B>, int) -> C<int>'
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// CHECK: |-TemplateArgument type 'int'
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// CHECK: |-TemplateArgument template B
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// CHECK: |-TemplateArgument type 'int'
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// CHECK: |-TemplateArgument integral 0
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// CHECK: |-ParmVarDecl {{.*}} 'int'
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// CHECK: |-ParmVarDecl {{.*}} 'Y<B>'
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// CHECK: `-ParmVarDecl {{.*}} 'int'
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// CHECK: FunctionProtoType {{.*}} 'auto (A, Y<>, type-parameter-0-2) -> C<A>' dependent trailing_return cdecl
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// CHECK: |-InjectedClassNameType {{.*}} 'C<A>' dependent
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// CHECK: |-TemplateTypeParmType {{.*}} 'A' dependent depth 0 index 0
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// CHECK: | `-TemplateTypeParm {{.*}} 'A'
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// CHECK: |-ElaboratedType {{.*}} 'Y<>' sugar dependent
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// CHECK: | `-TemplateSpecializationType {{.*}} 'Y<>' dependent Y
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// CHECK: | `-TemplateArgument template
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// CHECK: `-TemplateTypeParmType {{.*}} 'type-parameter-0-2' dependent depth 0 index 2
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template<typename ...T> struct D { // expected-note {{candidate}}
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template<typename... U> using B = int(int (*...p)(T, U));
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template<typename U1, typename U2> D(B<U1, U2>*); // expected-note {{candidate}}
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};
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int f(int(int, int), int(int, int));
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// FIXME: We can't deduce this because we can't deduce through a
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// SubstTemplateTypeParmPackType.
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D d = f; // expected-error {{no viable}}
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using DT = decltype(d);
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using DT = D<int, int>;
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// CHECK-LABEL: Dumping <deduction guide for D>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 ... T
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 1 U1
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 2 U2
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// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (B<type-parameter-0-1, type-parameter-0-2> *) -> D<T...>'
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// CHECK: `-ParmVarDecl {{.*}} 'B<type-parameter-0-1, type-parameter-0-2> *'
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// CHECK: FunctionProtoType {{.*}} 'auto (B<type-parameter-0-1, type-parameter-0-2> *) -> D<T...>' dependent trailing_return
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// CHECK: |-InjectedClassNameType {{.*}} 'D<T...>' dependent
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// CHECK: `-PointerType {{.*}} 'B<type-parameter-0-1, type-parameter-0-2> *' dependent
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// CHECK: `-TemplateSpecializationType {{.*}} 'B<type-parameter-0-1, type-parameter-0-2>' sugar dependent alias B
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// CHECK: |-TemplateArgument type 'type-parameter-0-1'
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// CHECK: |-TemplateArgument type 'type-parameter-0-2'
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// CHECK: `-FunctionProtoType {{.*}} 'int (int (*)(T, U)...)' dependent cdecl
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// CHECK: |-BuiltinType {{.*}} 'int'
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// CHECK: `-PackExpansionType {{.*}} 'int (*)(T, U)...' dependent expansions 2
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// CHECK: `-PointerType {{.*}} 'int (*)(T, U)' dependent contains_unexpanded_pack
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// CHECK: `-ParenType {{.*}} 'int (T, U)' sugar dependent contains_unexpanded_pack
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// CHECK: `-FunctionProtoType {{.*}} 'int (T, U)' dependent contains_unexpanded_pack cdecl
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// CHECK: |-BuiltinType {{.*}} 'int'
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// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent contains_unexpanded_pack depth 0 index 0 pack
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// CHECK: | `-TemplateTypeParm {{.*}} 'T'
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// CHECK: `-SubstTemplateTypeParmPackType {{.*}} 'U' dependent contains_unexpanded_pack typename depth 1 index 0 ... U
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// CHECK: |-TypeAliasTemplate {{.*}} 'B'
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// CHECK: `-TemplateArgument pack
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// CHECK: |-TemplateArgument type 'type-parameter-0-1'
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// CHECK-NOT: Subst
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// CHECK: | `-TemplateTypeParmType
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// CHECK: `-TemplateArgument type 'type-parameter-0-2'
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// CHECK-NOT: Subst
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// CHECK: `-TemplateTypeParmType
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template<int ...N> struct E { // expected-note {{candidate}}
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template<int ...M> using B = Z<X<N, M>...>;
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template<int M1, int M2> E(B<M1, M2>); // expected-note {{candidate}}
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};
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// FIXME: We can't deduce this because we can't deduce through a
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// SubstNonTypeTemplateParmPackExpr.
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E e = Z<X<1, 2>, X<3, 4>>(); // expected-error {{no viable}}
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using ET = decltype(e);
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using ET = E<1, 3>;
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// CHECK-LABEL: Dumping <deduction guide for E>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-NonTypeTemplateParmDecl [[N:0x[0-9a-f]*]] {{.*}} 'int' depth 0 index 0 ... N
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// CHECK: |-NonTypeTemplateParmDecl [[M1:0x[0-9a-f]*]] {{.*}} 'int' depth 0 index 1 M1
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// CHECK: |-NonTypeTemplateParmDecl [[M2:0x[0-9a-f]*]] {{.*}} 'int' depth 0 index 2 M2
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// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (B<M1, M2>) -> E<N...>'
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// CHECK: `-ParmVarDecl {{.*}} 'B<M1, M2>':'Z<X<N, M>...>'
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// CHECK: FunctionProtoType {{.*}} 'auto (B<M1, M2>) -> E<N...>' dependent trailing_return
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// CHECK: |-InjectedClassNameType {{.*}} 'E<N...>' dependent
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// CHECK: `-TemplateSpecializationType {{.*}} 'B<M1, M2>' sugar dependent alias B
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// CHECK: |-TemplateArgument expr
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// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm {{.*}} 'M1' 'int'
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// CHECK: |-TemplateArgument expr
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// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm {{.*}} 'M2' 'int'
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// CHECK: `-TemplateSpecializationType {{.*}} 'Z<X<N, M>...>' dependent Z
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// CHECK: `-TemplateArgument type 'X<N, M>...'
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// CHECK: `-PackExpansionType {{.*}} 'X<N, M>...' dependent expansions 2
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// CHECK: `-TemplateSpecializationType {{.*}} 'X<N, M>' dependent contains_unexpanded_pack X
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// CHECK: |-TemplateArgument expr
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// CHECK-NOT: Subst
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// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm [[N]] 'N' 'int'
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// CHECK: `-TemplateArgument expr
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// CHECK: `-SubstNonTypeTemplateParmPackExpr {{.*}} 'int'
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} referenced 'int' depth 1 index 0 ... M
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// CHECK: `-TemplateArgument pack
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// CHECK: |-TemplateArgument expr
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// CHECK-NOT: Subst
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// CHECK: | `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm [[M1]] 'M1' 'int'
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// CHECK: `-TemplateArgument expr
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// CHECK-NOT: Subst
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// CHECK: `-DeclRefExpr {{.*}} 'int' NonTypeTemplateParm [[M2]] 'M2' 'int'
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template <char = 'x'> struct F;
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template <char> struct F {
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template <typename U>
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requires(false) F(U);
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template <typename U>
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requires(true) F(U);
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};
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F s(0);
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// CHECK-LABEL: Dumping <deduction guide for F>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'char' depth 0 index 0
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// CHECK: `-TemplateArgument expr
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// CHECK: | |-inherited from NonTypeTemplateParm {{.*}} '' 'char'
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// CHECK: | `-CharacterLiteral {{.*}} 'char' 120
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// CHECK: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 1 U
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// CHECK: |-ParenExpr {{.*}} 'bool'
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// CHECK: | `-CXXBoolLiteralExpr {{.*}} 'bool' false
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// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for F> 'auto (type-parameter-0-1) -> F<>'
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// CHECK: | `-ParmVarDecl {{.*}} 'type-parameter-0-1'
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// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for F> 'auto (int) -> F<>'
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// CHECK: |-TemplateArgument integral 120
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// CHECK: |-TemplateArgument type 'int'
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// CHECK: | `-BuiltinType {{.*}} 'int'
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// CHECK: `-ParmVarDecl {{.*}} 'int'
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// CHECK: FunctionProtoType {{.*}} 'auto (type-parameter-0-1) -> F<>' dependent trailing_return cdecl
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// CHECK: |-InjectedClassNameType {{.*}} 'F<>' dependent
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// CHECK: | `-CXXRecord {{.*}} 'F'
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// CHECK: `-TemplateTypeParmType {{.*}} 'type-parameter-0-1' dependent depth 0 index 1
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template<typename T>
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struct G { T t; };
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G g = {1};
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// CHECK-LABEL: Dumping <deduction guide for G>:
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// CHECK: FunctionTemplateDecl
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// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for G> 'auto (T) -> G<T>' aggregate
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// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for G> 'auto (int) -> G<int>' implicit_instantiation aggregate
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template<typename X>
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using AG = G<X>;
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AG ag = {1};
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// Verify that the aggregate deduction guide for alias templates is built.
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// CHECK-LABEL: Dumping <deduction guide for AG>
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// CHECK: FunctionTemplateDecl
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// CHECK: |-CXXDeductionGuideDecl {{.*}} 'auto (type-parameter-0-0) -> G<type-parameter-0-0>'
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// CHECK: `-CXXDeductionGuideDecl {{.*}} 'auto (int) -> G<int>' implicit_instantiation
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// CHECK: |-TemplateArgument type 'int'
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// CHECK: | `-BuiltinType {{.*}} 'int'
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// CHECK: `-ParmVarDecl {{.*}} 'int'
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template <typename X = int>
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using BG = G<int>;
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BG bg(1.0);
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// CHECK-LABEL: Dumping <deduction guide for BG>
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// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for BG>
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// CHECK: |-CXXDeductionGuideDecl {{.*}} 'auto (int) -> G<int>' aggregate
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template <typename D>
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requires (sizeof(D) == 4)
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struct Foo {
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Foo(D);
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};
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template <typename U>
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using AFoo = Foo<G<U>>;
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// Verify that the require-clause from the Foo deduction guide is transformed.
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// The D occurrence should be rewritten to G<type-parameter-0-0>.
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//
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// CHECK-LABEL: Dumping <deduction guide for AFoo>
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// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for AFoo>
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// CHECK-NEXT: |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 U
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// CHECK-NEXT: |-ParenExpr {{.*}} 'bool'
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// CHECK-NEXT: | `-BinaryOperator {{.*}} 'bool' '=='
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// CHECK-NEXT: | |-UnaryExprOrTypeTraitExpr {{.*}} 'G<type-parameter-0-0>'
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// CHECK-NEXT: | `-ImplicitCastExpr {{.*}}
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// CHECK-NEXT: | `-IntegerLiteral {{.*}}
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// CHECK-NEXT: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for AFoo> 'auto (G<type-parameter-0-0>) -> Foo<G<type-parameter-0-0>>'
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// CHECK-NEXT: | `-ParmVarDecl {{.*}} 'G<type-parameter-0-0>'
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// CHECK-NEXT: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for AFoo> 'auto (G<int>) -> Foo<G<int>>' implicit_instantiation
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// CHECK-NEXT: |-TemplateArgument type 'int'
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// CHECK-NEXT: | `-BuiltinType {{.*}} 'int'
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// CHECK-NEXT: `-ParmVarDecl {{.*}} 'G<int>'
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AFoo aa(G<int>{});
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