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5b6f71b8f6
Not ready for review This is a quite large patch, half of which will be redone following a different approach. Although it improves sugar retention in template argument deduction on its own, this is an enabler for resugaring. This stores the sugared converted template arguments in a TST, in addition to the existing as-written ones, so this is quite wasteful. This is the biggest performance impact on the whole of resugaring so far, although it is hoped the new approach will have negligible impact. This is a continuation of https://reviews.llvm.org/D134113
201 lines
8.0 KiB
C++
201 lines
8.0 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=c++2a -ast-dump %s | FileCheck -strict-whitespace %s
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template <typename, typename>
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constexpr bool Concept = true;
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template<typename T> // depth 0
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struct Out {
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template<typename U> // depth 1
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struct Inner {
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U t;
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};
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template<typename V> // depth1
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requires Concept<T, V>
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Inner(V) -> Inner<V>;
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};
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template <typename X>
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struct Out2 {
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template<typename Y> // depth1
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using AInner = Out<int>::Inner<Y>;
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};
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Out2<double>::AInner t(1.0);
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// Verify that the require-clause of alias deduction guide is transformed correctly:
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// - Occurrence T should be replaced with `int`;
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// - Occurrence V should be replaced with the Y with depth 1
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// - Depth of occurrence Y in the __is_deducible constraint should be 1
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//
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// CHECK: | `-FunctionTemplateDecl {{.*}} <deduction guide for AInner>
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// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} typename depth 0 index 0 Y
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// CHECK-NEXT: | |-BinaryOperator {{.*}} '<dependent type>' '&&'
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// CHECK-NEXT: | | |-UnresolvedLookupExpr {{.*}} '<dependent type>' lvalue (no ADL) = 'Concept'
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// CHECK-NEXT: | | | |-TemplateArgument type 'int'
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// CHECK-NEXT: | | | | `-BuiltinType {{.*}} 'int'
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// CHECK-NEXT: | | | `-TemplateArgument type 'Y':'type-parameter-1-0'
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// CHECK-NEXT: | | | `-TemplateTypeParmType {{.*}} 'Y' dependent depth 1 index 0
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// CHECK-NEXT: | | | `-TemplateTypeParm {{.*}} 'Y'
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// CHECK-NEXT: | | `-TypeTraitExpr {{.*}} 'bool' __is_deducible
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// CHECK-NEXT: | | |-DeducedTemplateSpecializationType {{.*}} 'Out2<double>::AInner' dependent
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// CHECK-NEXT: | | | `-name: 'Out2<double>::AInner'
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// CHECK-NEXT: | | | `-TypeAliasTemplateDecl {{.+}} AInner{{$}}
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// CHECK-NEXT: | | `-ElaboratedType {{.*}} 'Inner<Y>' sugar dependent
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// CHECK-NEXT: | | `-TemplateSpecializationType {{.*}} 'Inner<Y>' dependent
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// CHECK-NEXT: | | |-name: 'Inner':'Out<int>::Inner' qualified
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// CHECK-NEXT: | | | `-ClassTemplateDecl {{.+}} Inner{{$}}
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// CHECK-NEXT: | | `-TemplateArgument type 'Y'
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// CHECK-NEXT: | | `-SubstTemplateTypeParmType {{.*}} 'Y'
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// CHECK-NEXT: | | |-FunctionTemplate {{.*}} '<deduction guide for Inner>'
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// CHECK-NEXT: | | `-TemplateTypeParmType {{.*}} 'Y' dependent depth 1 index 0
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// CHECK-NEXT: | | `-TemplateTypeParm {{.*}} 'Y'
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// CHECK-NEXT: | |-CXXDeductionGuideDecl {{.*}} <deduction guide for AInner> 'auto (Y) -> Inner<Y>'
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// CHECK-NEXT: | | `-ParmVarDecl {{.*}} 'Y'
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// CHECK-NEXT: | `-CXXDeductionGuideDecl {{.*}} used <deduction guide for AInner> 'auto (double) -> Inner<double>' implicit_instantiation
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// CHECK-NEXT: | |-TemplateArgument type 'double'
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// CHECK-NEXT: | | `-BuiltinType {{.*}} 'double'
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// CHECK-NEXT: | `-ParmVarDecl {{.*}} 'double'
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// GH92596
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template <typename T0>
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struct Out3 {
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template<class T1, typename T2>
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struct Foo {
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// Deduction guide:
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// template <typename T1, typename T2, typename V>
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// Foo(V, T1) -> Foo<T1, T2>;
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template<class V> requires Concept<T0, V> // V in require clause of Foo deduction guide: depth 1, index: 2
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Foo(V, T1);
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};
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};
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template<class T3>
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using AFoo3 = Out3<int>::Foo<T3, T3>;
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AFoo3 afoo3{0, 1};
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// Verify occurrence V in the require-clause is transformed (depth: 1 => 0, index: 2 => 1) correctly.
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// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for AFoo3>
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// CHECK-NEXT: |-TemplateTypeParmDecl {{.*}} class depth 0 index 0 T3
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// CHECK-NEXT: |-TemplateTypeParmDecl {{.*}} class depth 0 index 1 V
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// CHECK-NEXT: |-BinaryOperator {{.*}} '<dependent type>' '&&'
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// CHECK-NEXT: | |-UnresolvedLookupExpr {{.*}} '<dependent type>' lvalue (no ADL) = 'Concept'
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// CHECK-NEXT: | | |-TemplateArgument type 'int'
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// CHECK-NEXT: | | | `-BuiltinType {{.*}} 'int'
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// CHECK-NEXT: | | `-TemplateArgument type 'V'
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// CHECK-NEXT: | | `-TemplateTypeParmType {{.*}} 'V' dependent depth 0 index 1
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template <typename... T1>
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struct Foo {
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Foo(T1...);
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};
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template <typename...T2>
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using AFoo = Foo<T2...>;
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AFoo a(1, 2);
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// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for AFoo> 'auto (T2...) -> Foo<T2...>'
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// CHECK-NEXT: | | `-ParmVarDecl {{.*}} 'T2...' pack
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// CHECK-NEXT: | `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for AFoo> 'auto (int, int) -> Foo<int, int>' implicit_instantiation
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template <typename T>
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using BFoo = Foo<T, T>;
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BFoo b2(1.0, 2.0);
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// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for BFoo> 'auto (T, T) -> Foo<T, T>'
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// CHECK-NEXT: | | |-ParmVarDecl {{.*}} 'T'
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// CHECK-NEXT: | | `-ParmVarDecl {{.*}} 'T'
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// CHECK-NEXT: | `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for BFoo> 'auto (double, double) -> Foo<double, double>' implicit_instantiation
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namespace GH90209 {
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// Case 1: type template parameter
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template <class Ts>
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struct List1 {
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List1(int);
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};
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template <class T1>
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struct TemplatedClass1 {
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TemplatedClass1(T1);
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};
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template <class T1>
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TemplatedClass1(T1) -> TemplatedClass1<List1<T1>>;
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template <class T2>
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using ATemplatedClass1 = TemplatedClass1<List1<T2>>;
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ATemplatedClass1 test1(1);
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// Verify that we have a correct template parameter list for the deduction guide.
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//
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// CHECK: FunctionTemplateDecl {{.*}} <deduction guide for ATemplatedClass1>
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// CHECK-NEXT: |-TemplateTypeParmDecl {{.*}} class depth 0 index 0 T2
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// CHECK-NEXT: |-TypeTraitExpr {{.*}} 'bool' __is_deducible
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// Case 2: template template parameter
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template<typename K> struct Foo{};
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template <template<typename> typename Ts>
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struct List2 {
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List2(int);
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};
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template <typename T1>
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struct TemplatedClass2 {
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TemplatedClass2(T1);
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};
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template <template<typename> typename T1>
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TemplatedClass2(T1<int>) -> TemplatedClass2<List2<T1>>;
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template <template<typename> typename T2>
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using ATemplatedClass2 = TemplatedClass2<List2<T2>>;
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List2<Foo> list(1);
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ATemplatedClass2 test2(list);
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// Verify that we have a correct template parameter list for the deduction guide.
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//
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// CHECK: FunctionTemplateDecl {{.*}} <deduction guide for ATemplatedClass2>
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// CHECK-NEXT: |-TemplateTemplateParmDecl {{.*}} depth 0 index 0 T2
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// CHECK-NEXT: | `-TemplateTypeParmDecl {{.*}} typename depth 0 index 0
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// CHECK-NEXT: |-TypeTraitExpr {{.*}} 'bool' __is_deducible
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} // namespace GH90209
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namespace GH124715 {
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template <class T, class... Args>
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concept invocable = true;
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template <class T, class... Args> struct Struct {
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template <class U>
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requires invocable<U, Args...>
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Struct(U, Args...) {}
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};
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template <class...> struct Packs {};
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template <class Lambda, class... Args>
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Struct(Lambda lambda, Args... args) -> Struct<Lambda, Args...>;
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template <class T, class... Ts> using Alias = Struct<T, Packs<Ts...>>;
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void foo() {
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Alias([](int) {}, Packs<int>());
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}
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// CHECK: |-FunctionTemplateDecl {{.*}} implicit <deduction guide for Alias>
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// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} class depth 0 index 0 T
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// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} class depth 0 index 1 ... Ts
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// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} class depth 0 index 2 U
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// CHECK-NEXT: | |-BinaryOperator {{.*}} 'bool' '&&'
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// CHECK-NEXT: | | |-ConceptSpecializationExpr {{.*}} 'bool' Concept {{.*}} 'invocable'
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// CHECK-NEXT: | | | |-ImplicitConceptSpecializationDecl {{.*}}
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// CHECK-NEXT: | | | | |-TemplateArgument type 'type-parameter-0-2'
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// CHECK-NEXT: | | | | | `-TemplateTypeParmType {{.*}} 'type-parameter-0-2' dependent depth 0 index 2
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// CHECK-NEXT: | | | | `-TemplateArgument pack '<Packs<type-parameter-0-1...>>'
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// CHECK-NEXT: | | | | `-TemplateArgument type 'Packs<type-parameter-0-1...>'
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// CHECK-NEXT: | | | | `-TemplateSpecializationType {{.*}} 'Packs<type-parameter-0-1...>' dependent
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// CHECK-NEXT: | | | | `-name: 'GH124715::Packs'
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// CHECK-NEXT: | | | | `-ClassTemplateDecl {{.*}} Packs
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// CHECK-NEXT: | | | |-TemplateArgument {{.*}} type 'U':'type-parameter-0-2'
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// CHECK-NEXT: | | | | `-TemplateTypeParmType {{.*}} 'U' dependent depth 0 index 2
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// CHECK-NEXT: | | | | `-TemplateTypeParm {{.*}} 'U'
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} // namespace GH124715
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