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llvm-project/clang/test/AST/ast-dump-openmp-begin-declare-variant_template_3.cpp
Matheus Izvekov 91cdd35008
[clang] Improve nested name specifier AST representation (#147835) 
This is a major change on how we represent nested name qualifications in
the AST.

* The nested name specifier itself and how it's stored is changed. The
prefixes for types are handled within the type hierarchy, which makes
canonicalization for them super cheap, no memory allocation required.
Also translating a type into nested name specifier form becomes a no-op.
An identifier is stored as a DependentNameType. The nested name
specifier gains a lightweight handle class, to be used instead of
passing around pointers, which is similar to what is implemented for
TemplateName. There is still one free bit available, and this handle can
be used within a PointerUnion and PointerIntPair, which should keep
bit-packing aficionados happy.
* The ElaboratedType node is removed, all type nodes in which it could
previously apply to can now store the elaborated keyword and name
qualifier, tail allocating when present.
* TagTypes can now point to the exact declaration found when producing
these, as opposed to the previous situation of there only existing one
TagType per entity. This increases the amount of type sugar retained,
and can have several applications, for example in tracking module
ownership, and other tools which care about source file origins, such as
IWYU. These TagTypes are lazily allocated, in order to limit the
increase in AST size.

This patch offers a great performance benefit.

It greatly improves compilation time for
[stdexec](https://github.com/NVIDIA/stdexec). For one datapoint, for
`test_on2.cpp` in that project, which is the slowest compiling test,
this patch improves `-c` compilation time by about 7.2%, with the
`-fsyntax-only` improvement being at ~12%.

This has great results on compile-time-tracker as well:

![image](https://github.com/user-attachments/assets/700dce98-2cab-4aa8-97d1-b038c0bee831)

This patch also further enables other optimziations in the future, and
will reduce the performance impact of template specialization resugaring
when that lands.

It has some other miscelaneous drive-by fixes.

About the review: Yes the patch is huge, sorry about that. Part of the
reason is that I started by the nested name specifier part, before the
ElaboratedType part, but that had a huge performance downside, as
ElaboratedType is a big performance hog. I didn't have the steam to go
back and change the patch after the fact.

There is also a lot of internal API changes, and it made sense to remove
ElaboratedType in one go, versus removing it from one type at a time, as
that would present much more churn to the users. Also, the nested name
specifier having a different API avoids missing changes related to how
prefixes work now, which could make existing code compile but not work.

How to review: The important changes are all in
`clang/include/clang/AST` and `clang/lib/AST`, with also important
changes in `clang/lib/Sema/TreeTransform.h`.

The rest and bulk of the changes are mostly consequences of the changes
in API.

PS: TagType::getDecl is renamed to `getOriginalDecl` in this patch, just
for easier to rebasing. I plan to rename it back after this lands.

Fixes #136624
Fixes https://github.com/llvm/llvm-project/issues/43179
Fixes https://github.com/llvm/llvm-project/issues/68670
Fixes https://github.com/llvm/llvm-project/issues/92757
2025-08-09 05:06:53 -03:00

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// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fopenmp -verify -ast-dump %s %std_cxx11-14 | FileCheck %s --check-prefixes=CHECK,CXX11
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fopenmp -verify -ast-dump %s %std_cxx17- | FileCheck %s --check-prefixes=CHECK,CXX17
// expected-no-diagnostics
// PR47655
template <typename T> struct S {
S(int, T *) {}
};
template <typename T>
int also_before(T s) {
return 0;
}
#pragma omp begin declare variant match(implementation = {extension(allow_templates)})
template <typename T>
int also_before(S<T> s) {
// Ensure there is no error because this is never instantiated.
double t;
S<T> q(1, &t);
return 1;
}
template <typename T>
int special(S<T> s) {
T t;
S<T> q(0, &t);
return 0;
}
template <typename T>
int also_after(S<T> s) {
// Ensure there is no error because this is never instantiated.
double t;
S<T> q(2.0, &t);
return 2;
}
#pragma omp end declare variant
template <typename T>
int also_after(T s) {
return 0;
}
int test() {
// Should return 0.
return also_before(0) + also_after(0) + also_before(0.) + also_after(0.) + special(S<int>(0, 0));
}
// CHECK: |-ClassTemplateDecl [[ADDR_0:0x[a-z0-9]*]] <{{.*}}, line:7:1> line:5:30 S
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_1:0x[a-z0-9]*]] <col:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | |-CXXRecordDecl [[ADDR_2:0x[a-z0-9]*]] <col:23, line:7:1> line:5:30 struct S definition
// CHECK-NEXT: | | |-DefinitionData empty standard_layout trivially_copyable has_user_declared_ctor can_const_default_init
// CHECK-NEXT: | | | |-DefaultConstructor defaulted_is_constexpr
// CHECK-NEXT: | | | |-CopyConstructor simple trivial has_const_param needs_implicit implicit_has_const_param
// CHECK-NEXT: | | | |-MoveConstructor exists simple trivial needs_implicit
// CHECK-NEXT: | | | |-CopyAssignment simple trivial has_const_param needs_implicit implicit_has_const_param
// CHECK-NEXT: | | | |-MoveAssignment exists simple trivial needs_implicit
// CHECK-NEXT: | | | `-Destructor simple irrelevant trivial {{(constexpr )?}}needs_implicit
// CHECK-NEXT: | | |-CXXRecordDecl [[ADDR_3:0x[a-z0-9]*]] <col:23, col:30> col:30 implicit struct S
// CHECK-NEXT: | | `-CXXConstructorDecl [[ADDR_4:0x[a-z0-9]*]] <line:6:3, col:16> col:3 S<T> 'void (int, T *)'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_5:0x[a-z0-9]*]] <col:5> col:8 'int'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_6:0x[a-z0-9]*]] <col:10, col:12> col:13 'T *'
// CHECK-NEXT: | | `-CompoundStmt [[ADDR_7:0x[a-z0-9]*]] <col:15, col:16>
// CHECK-NEXT: | |-ClassTemplateSpecializationDecl [[ADDR_8:0x[a-z0-9]*]] <line:5:1, line:7:1> line:5:30 struct S definition
// CHECK-NEXT: | | |-DefinitionData pass_in_registers empty standard_layout trivially_copyable has_user_declared_ctor can_const_default_init
// CHECK-NEXT: | | | |-DefaultConstructor defaulted_is_constexpr
// CHECK-NEXT: | | | |-CopyConstructor simple trivial has_const_param implicit_has_const_param
// CHECK-NEXT: | | | |-MoveConstructor exists simple trivial
// CHECK-NEXT: | | | |-CopyAssignment simple trivial has_const_param needs_implicit implicit_has_const_param
// CHECK-NEXT: | | | |-MoveAssignment exists simple trivial needs_implicit
// CHECK-NEXT: | | | `-Destructor simple irrelevant trivial
// CHECK-NEXT: | | |-TemplateArgument type 'int'
// CHECK-NEXT: | | | `-BuiltinType [[ADDR_9:0x[a-z0-9]*]] 'int'
// CHECK-NEXT: | | |-CXXRecordDecl [[ADDR_10:0x[a-z0-9]*]] <col:23, col:30> col:30 implicit struct S
// CHECK-NEXT: | | |-CXXConstructorDecl [[ADDR_11:0x[a-z0-9]*]] <line:6:3, col:16> col:3 used S 'void (int, int *)'
// CHECK-NEXT: | | | |-ParmVarDecl [[ADDR_12:0x[a-z0-9]*]] <col:5> col:8 'int'
// CHECK-NEXT: | | | |-ParmVarDecl [[ADDR_13:0x[a-z0-9]*]] <col:10, col:12> col:13 'int *'
// CHECK-NEXT: | | | `-CompoundStmt [[ADDR_7]] <col:15, col:16>
// CHECK-NEXT: | | |-CXXConstructorDecl [[ADDR_14:0x[a-z0-9]*]] <line:5:30> col:30 implicit constexpr S 'void (const S<int> &)' inline default trivial noexcept-unevaluated [[ADDR_14]]
// CHECK-NEXT: | | | `-ParmVarDecl [[ADDR_15:0x[a-z0-9]*]] <col:30> col:30 'const S<int> &'
// CXX11-NEXT: | | |-CXXConstructorDecl [[ADDR_16:0x[a-z0-9]*]] <col:30> col:30 implicit used constexpr S 'void (S<int> &&) noexcept' inline default trivial
// CXX11-NEXT: | | | |-ParmVarDecl [[ADDR_17:0x[a-z0-9]*]] <col:30> col:30 'S<int> &&'
// CXX11-NEXT: | | | `-CompoundStmt [[ADDR_18:0x[a-z0-9]*]] <col:30>
// CXX17-NEXT: | | |-CXXConstructorDecl [[ADDR_16:0x[a-z0-9]*]] <col:30> col:30 implicit constexpr S 'void (S<int> &&)' inline default trivial noexcept-unevaluated
// CXX17-NEXT: | | | `-ParmVarDecl [[ADDR_17:0x[a-z0-9]*]] <col:30> col:30 'S<int> &&'
// CHECK-NEXT: | | `-CXXDestructorDecl [[ADDR_19:0x[a-z0-9]*]] <col:30> col:30 implicit referenced {{(constexpr )?}}~S 'void ({{.*}}) noexcept' inline default trivial
// CHECK-NEXT: | `-ClassTemplateSpecializationDecl [[ADDR_20:0x[a-z0-9]*]] <col:1, line:7:1> line:5:30 struct S
// CHECK-NEXT: | `-TemplateArgument type 'double'
// CHECK-NEXT: | `-BuiltinType [[ADDR_21:0x[a-z0-9]*]] 'double'
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_22:0x[a-z0-9]*]] <line:9:1, line:12:1> line:10:5 also_before
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_23:0x[a-z0-9]*]] <line:9:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | |-FunctionDecl [[ADDR_24:0x[a-z0-9]*]] <line:10:1, line:12:1> line:10:5 also_before 'int (T)'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_25:0x[a-z0-9]*]] <col:17, col:19> col:19 s 'T'
// CHECK-NEXT: | | |-CompoundStmt [[ADDR_26:0x[a-z0-9]*]] <col:22, line:12:1>
// CHECK-NEXT: | | | `-ReturnStmt [[ADDR_27:0x[a-z0-9]*]] <line:11:3, col:10>
// CHECK-NEXT: | | | `-IntegerLiteral [[ADDR_28:0x[a-z0-9]*]] <col:10> 'int' 0
// CHECK-NEXT: | | `-OMPDeclareVariantAttr [[ADDR_29:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_30:0x[a-z0-9]*]] <line:16:1> 'int (S<T>)' {{.*}}Function [[ADDR_31:0x[a-z0-9]*]] 'also_before[implementation={extension(allow_templates)}]' 'int (S<T>)'
// CHECK-NEXT: | |-FunctionDecl [[ADDR_32:0x[a-z0-9]*]] <line:10:1, line:12:1> line:10:5 used also_before 'int (int)'
// CHECK-NEXT: | | |-TemplateArgument type 'int'
// CHECK-NEXT: | | | `-BuiltinType [[ADDR_9]] 'int'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_33:0x[a-z0-9]*]] <col:17, col:19> col:19 s 'int'
// CHECK-NEXT: | | `-CompoundStmt [[ADDR_34:0x[a-z0-9]*]] <col:22, line:12:1>
// CHECK-NEXT: | | `-ReturnStmt [[ADDR_35:0x[a-z0-9]*]] <line:11:3, col:10>
// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_28]] <col:10> 'int' 0
// CHECK-NEXT: | `-FunctionDecl [[ADDR_36:0x[a-z0-9]*]] <line:10:1, line:12:1> line:10:5 used also_before 'int (double)'
// CHECK-NEXT: | |-TemplateArgument type 'double'
// CHECK-NEXT: | | `-BuiltinType [[ADDR_21]] 'double'
// CHECK-NEXT: | |-ParmVarDecl [[ADDR_37:0x[a-z0-9]*]] <col:17, col:19> col:19 s 'double'
// CHECK-NEXT: | `-CompoundStmt [[ADDR_38:0x[a-z0-9]*]] <col:22, line:12:1>
// CHECK-NEXT: | `-ReturnStmt [[ADDR_39:0x[a-z0-9]*]] <line:11:3, col:10>
// CHECK-NEXT: | `-IntegerLiteral [[ADDR_28]] <col:10> 'int' 0
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_40:0x[a-z0-9]*]] <line:15:1, line:21:1> line:16:1 also_before[implementation={extension(allow_templates)}]
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_41:0x[a-z0-9]*]] <line:15:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | |-FunctionDecl [[ADDR_31]] <line:16:1, line:21:1> line:16:1 referenced also_before[implementation={extension(allow_templates)}] 'int (S<T>)'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_42:0x[a-z0-9]*]] <col:17, col:22> col:22 s 'S<T>'
// CHECK-NEXT: | | `-CompoundStmt [[ADDR_43:0x[a-z0-9]*]] <col:25, line:21:1>
// CHECK-NEXT: | | |-DeclStmt [[ADDR_44:0x[a-z0-9]*]] <line:18:3, col:11>
// CHECK-NEXT: | | | `-VarDecl [[ADDR_45:0x[a-z0-9]*]] <col:3, col:10> col:10 referenced t 'double'
// CHECK-NEXT: | | |-DeclStmt [[ADDR_46:0x[a-z0-9]*]] <line:19:3, col:16>
// CHECK-NEXT: | | | `-VarDecl [[ADDR_47:0x[a-z0-9]*]] <col:3, col:15> col:8 q 'S<T>' callinit
// CHECK-NEXT: | | | `-ParenListExpr [[ADDR_48:0x[a-z0-9]*]] <col:9, col:15> 'NULL TYPE'
// CHECK-NEXT: | | | |-IntegerLiteral [[ADDR_49:0x[a-z0-9]*]] <col:10> 'int' 1
// CHECK-NEXT: | | | `-UnaryOperator [[ADDR_50:0x[a-z0-9]*]] <col:13, col:14> 'double *' prefix '&' cannot overflow
// CHECK-NEXT: | | | `-DeclRefExpr [[ADDR_51:0x[a-z0-9]*]] <col:14> 'double' {{.*}}Var [[ADDR_45]] 't' 'double'
// CHECK-NEXT: | | `-ReturnStmt [[ADDR_52:0x[a-z0-9]*]] <line:20:3, col:10>
// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_53:0x[a-z0-9]*]] <col:10> 'int' 1
// CHECK-NEXT: | |-FunctionDecl [[ADDR_54:0x[a-z0-9]*]] <line:16:1, line:21:1> line:16:1 also_before[implementation={extension(allow_templates)}] 'int (S<int>)'
// CHECK-NEXT: | | |-TemplateArgument type 'int'
// CHECK-NEXT: | | | `-BuiltinType [[ADDR_9]] 'int'
// CHECK-NEXT: | | `-ParmVarDecl [[ADDR_55:0x[a-z0-9]*]] <col:17, col:22> col:22 s 'S<int>'
// CHECK-NEXT: | `-FunctionDecl [[ADDR_56:0x[a-z0-9]*]] <col:1, line:21:1> line:16:1 also_before[implementation={extension(allow_templates)}] 'int (S<double>)'
// CHECK-NEXT: | |-TemplateArgument type 'double'
// CHECK-NEXT: | | `-BuiltinType [[ADDR_21]] 'double'
// CHECK-NEXT: | `-ParmVarDecl [[ADDR_57:0x[a-z0-9]*]] <col:17, col:22> col:22 s 'S<double>'
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_58:0x[a-z0-9]*]] <line:22:1, line:23:19> col:5 implicit special
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_59:0x[a-z0-9]*]] <line:22:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | |-FunctionDecl [[ADDR_60:0x[a-z0-9]*]] <line:23:1, col:19> col:5 special 'int (S<T>)'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_61:0x[a-z0-9]*]] <col:13, col:18> col:18 s 'S<T>'
// CHECK-NEXT: | | `-OMPDeclareVariantAttr [[ADDR_62:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_63:0x[a-z0-9]*]] <col:1> 'int (S<T>)' {{.*}}Function [[ADDR_64:0x[a-z0-9]*]] 'special[implementation={extension(allow_templates)}]' 'int (S<T>)'
// CHECK-NEXT: | `-FunctionDecl [[ADDR_65:0x[a-z0-9]*]] <col:1, col:19> col:5 used special 'int (S<int>)'
// CHECK-NEXT: | |-TemplateArgument type 'int'
// CHECK-NEXT: | | `-BuiltinType [[ADDR_9]] 'int'
// CHECK-NEXT: | |-ParmVarDecl [[ADDR_66:0x[a-z0-9]*]] <col:13, col:18> col:18 s 'S<int>'
// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_67:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
// CHECK-NEXT: | `-DeclRefExpr [[ADDR_68:0x[a-z0-9]*]] <col:1> 'int (S<int>)' {{.*}}Function [[ADDR_69:0x[a-z0-9]*]] 'special[implementation={extension(allow_templates)}]' 'int (S<int>)'
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_70:0x[a-z0-9]*]] <line:22:1, line:27:1> line:23:1 special[implementation={extension(allow_templates)}]
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_59]] <line:22:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | |-FunctionDecl [[ADDR_64]] <line:23:1, line:27:1> line:23:1 referenced special[implementation={extension(allow_templates)}] 'int (S<T>)'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_61]] <col:13, col:18> col:18 s 'S<T>'
// CHECK-NEXT: | | `-CompoundStmt [[ADDR_71:0x[a-z0-9]*]] <col:21, line:27:1>
// CHECK-NEXT: | | |-DeclStmt [[ADDR_72:0x[a-z0-9]*]] <line:24:3, col:6>
// CHECK-NEXT: | | | `-VarDecl [[ADDR_73:0x[a-z0-9]*]] <col:3, col:5> col:5 referenced t 'T'
// CHECK-NEXT: | | |-DeclStmt [[ADDR_74:0x[a-z0-9]*]] <line:25:3, col:16>
// CHECK-NEXT: | | | `-VarDecl [[ADDR_75:0x[a-z0-9]*]] <col:3, col:15> col:8 q 'S<T>' callinit
// CHECK-NEXT: | | | `-ParenListExpr [[ADDR_76:0x[a-z0-9]*]] <col:9, col:15> 'NULL TYPE'
// CHECK-NEXT: | | | |-IntegerLiteral [[ADDR_77:0x[a-z0-9]*]] <col:10> 'int' 0
// CHECK-NEXT: | | | `-UnaryOperator [[ADDR_78:0x[a-z0-9]*]] <col:13, col:14> '<dependent type>' prefix '&' cannot overflow
// CHECK-NEXT: | | | `-DeclRefExpr [[ADDR_79:0x[a-z0-9]*]] <col:14> 'T' {{.*}}Var [[ADDR_73]] 't' 'T'
// CHECK-NEXT: | | `-ReturnStmt [[ADDR_80:0x[a-z0-9]*]] <line:26:3, col:10>
// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_81:0x[a-z0-9]*]] <col:10> 'int' 0
// CHECK-NEXT: | `-FunctionDecl [[ADDR_69]] <line:23:1, line:27:1> line:23:1 special[implementation={extension(allow_templates)}] 'int (S<int>)'
// CHECK-NEXT: | |-TemplateArgument type 'int'
// CHECK-NEXT: | | `-BuiltinType [[ADDR_9]] 'int'
// CHECK-NEXT: | |-ParmVarDecl [[ADDR_82:0x[a-z0-9]*]] <col:13, col:18> col:18 s 'S<int>'
// CHECK-NEXT: | `-CompoundStmt [[ADDR_83:0x[a-z0-9]*]] <col:21, line:27:1>
// CHECK-NEXT: | |-DeclStmt [[ADDR_84:0x[a-z0-9]*]] <line:24:3, col:6>
// CHECK-NEXT: | | `-VarDecl [[ADDR_85:0x[a-z0-9]*]] <col:3, col:5> col:5 used t 'int'
// CHECK-NEXT: | |-DeclStmt [[ADDR_86:0x[a-z0-9]*]] <line:25:3, col:16>
// CHECK-NEXT: | | `-VarDecl [[ADDR_87:0x[a-z0-9]*]] <col:3, col:15> col:8 q 'S<int>' callinit
// CHECK-NEXT: | | `-CXXConstructExpr [[ADDR_88:0x[a-z0-9]*]] <col:8, col:15> 'S<int>' 'void (int, int *)'
// CHECK-NEXT: | | |-IntegerLiteral [[ADDR_77]] <col:10> 'int' 0
// CHECK-NEXT: | | `-UnaryOperator [[ADDR_89:0x[a-z0-9]*]] <col:13, col:14> 'int *' prefix '&' cannot overflow
// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_90:0x[a-z0-9]*]] <col:14> 'int' {{.*}}Var [[ADDR_85]] 't' 'int'
// CHECK-NEXT: | `-ReturnStmt [[ADDR_91:0x[a-z0-9]*]] <line:26:3, col:10>
// CHECK-NEXT: | `-IntegerLiteral [[ADDR_81]] <col:10> 'int' 0
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_92:0x[a-z0-9]*]] <line:28:1, line:29:22> col:5 implicit also_after
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_93:0x[a-z0-9]*]] <line:28:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | `-FunctionDecl [[ADDR_94:0x[a-z0-9]*]] <line:29:1, col:22> col:5 also_after 'int (S<T>)'
// CHECK-NEXT: | |-ParmVarDecl [[ADDR_95:0x[a-z0-9]*]] <col:16, col:21> col:21 s 'S<T>'
// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_96:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
// CHECK-NEXT: | `-DeclRefExpr [[ADDR_97:0x[a-z0-9]*]] <col:1> 'int (S<T>)' {{.*}}Function [[ADDR_98:0x[a-z0-9]*]] 'also_after[implementation={extension(allow_templates)}]' 'int (S<T>)'
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_99:0x[a-z0-9]*]] <line:28:1, line:34:1> line:29:1 also_after[implementation={extension(allow_templates)}]
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_93]] <line:28:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | `-FunctionDecl [[ADDR_98]] <line:29:1, line:34:1> line:29:1 also_after[implementation={extension(allow_templates)}] 'int (S<T>)'
// CHECK-NEXT: | |-ParmVarDecl [[ADDR_95]] <col:16, col:21> col:21 s 'S<T>'
// CHECK-NEXT: | `-CompoundStmt [[ADDR_100:0x[a-z0-9]*]] <col:24, line:34:1>
// CHECK-NEXT: | |-DeclStmt [[ADDR_101:0x[a-z0-9]*]] <line:31:3, col:11>
// CHECK-NEXT: | | `-VarDecl [[ADDR_102:0x[a-z0-9]*]] <col:3, col:10> col:10 referenced t 'double'
// CHECK-NEXT: | |-DeclStmt [[ADDR_103:0x[a-z0-9]*]] <line:32:3, col:18>
// CHECK-NEXT: | | `-VarDecl [[ADDR_104:0x[a-z0-9]*]] <col:3, col:17> col:8 q 'S<T>' callinit
// CHECK-NEXT: | | `-ParenListExpr [[ADDR_105:0x[a-z0-9]*]] <col:9, col:17> 'NULL TYPE'
// CHECK-NEXT: | | |-FloatingLiteral [[ADDR_106:0x[a-z0-9]*]] <col:10> 'double' 2.000000e+00
// CHECK-NEXT: | | `-UnaryOperator [[ADDR_107:0x[a-z0-9]*]] <col:15, col:16> 'double *' prefix '&' cannot overflow
// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_108:0x[a-z0-9]*]] <col:16> 'double' {{.*}}Var [[ADDR_102]] 't' 'double'
// CHECK-NEXT: | `-ReturnStmt [[ADDR_109:0x[a-z0-9]*]] <line:33:3, col:10>
// CHECK-NEXT: | `-IntegerLiteral [[ADDR_110:0x[a-z0-9]*]] <col:10> 'int' 2
// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_111:0x[a-z0-9]*]] <line:37:1, line:40:1> line:38:5 also_after
// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_112:0x[a-z0-9]*]] <line:37:11, col:20> col:20 referenced typename depth 0 index 0 T
// CHECK-NEXT: | |-FunctionDecl [[ADDR_113:0x[a-z0-9]*]] <line:38:1, line:40:1> line:38:5 also_after 'int (T)'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_114:0x[a-z0-9]*]] <col:16, col:18> col:18 s 'T'
// CHECK-NEXT: | | `-CompoundStmt [[ADDR_115:0x[a-z0-9]*]] <col:21, line:40:1>
// CHECK-NEXT: | | `-ReturnStmt [[ADDR_116:0x[a-z0-9]*]] <line:39:3, col:10>
// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_117:0x[a-z0-9]*]] <col:10> 'int' 0
// CHECK-NEXT: | |-FunctionDecl [[ADDR_118:0x[a-z0-9]*]] <line:38:1, line:40:1> line:38:5 used also_after 'int (int)'
// CHECK-NEXT: | | |-TemplateArgument type 'int'
// CHECK-NEXT: | | | `-BuiltinType [[ADDR_9]] 'int'
// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_119:0x[a-z0-9]*]] <col:16, col:18> col:18 s 'int'
// CHECK-NEXT: | | `-CompoundStmt [[ADDR_120:0x[a-z0-9]*]] <col:21, line:40:1>
// CHECK-NEXT: | | `-ReturnStmt [[ADDR_121:0x[a-z0-9]*]] <line:39:3, col:10>
// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_117]] <col:10> 'int' 0
// CHECK-NEXT: | `-FunctionDecl [[ADDR_122:0x[a-z0-9]*]] <line:38:1, line:40:1> line:38:5 used also_after 'int (double)'
// CHECK-NEXT: | |-TemplateArgument type 'double'
// CHECK-NEXT: | | `-BuiltinType [[ADDR_21]] 'double'
// CHECK-NEXT: | |-ParmVarDecl [[ADDR_123:0x[a-z0-9]*]] <col:16, col:18> col:18 s 'double'
// CHECK-NEXT: | `-CompoundStmt [[ADDR_124:0x[a-z0-9]*]] <col:21, line:40:1>
// CHECK-NEXT: | `-ReturnStmt [[ADDR_125:0x[a-z0-9]*]] <line:39:3, col:10>
// CHECK-NEXT: | `-IntegerLiteral [[ADDR_117]] <col:10> 'int' 0
// CHECK-NEXT: `-FunctionDecl [[ADDR_126:0x[a-z0-9]*]] <line:42:1, line:45:1> line:42:5 test 'int ({{.*}})'
// CHECK-NEXT: `-CompoundStmt [[ADDR_127:0x[a-z0-9]*]] <col:12, line:45:1>
// CHECK-NEXT: `-ReturnStmt [[ADDR_128:0x[a-z0-9]*]] <line:44:3, col:98>
// CXX11-NEXT: `-ExprWithCleanups [[ADDR_129:0x[a-z0-9]*]] <col:10, col:98> 'int'
// CHECK-NEXT: `-BinaryOperator [[ADDR_130:0x[a-z0-9]*]] <col:10, col:98> 'int' '+'
// CHECK-NEXT: |-BinaryOperator [[ADDR_131:0x[a-z0-9]*]] <col:10, col:74> 'int' '+'
// CHECK-NEXT: | |-BinaryOperator [[ADDR_132:0x[a-z0-9]*]] <col:10, col:57> 'int' '+'
// CHECK-NEXT: | | |-BinaryOperator [[ADDR_133:0x[a-z0-9]*]] <col:10, col:39> 'int' '+'
// CHECK-NEXT: | | | |-CallExpr [[ADDR_134:0x[a-z0-9]*]] <col:10, col:23> 'int'
// CHECK-NEXT: | | | | |-ImplicitCastExpr [[ADDR_135:0x[a-z0-9]*]] <col:10> 'int (*)(int)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | | `-DeclRefExpr [[ADDR_136:0x[a-z0-9]*]] <col:10> 'int (int)' {{.*}}Function [[ADDR_32]] 'also_before' 'int (int)' (FunctionTemplate [[ADDR_22]] 'also_before')
// CHECK-NEXT: | | | | `-IntegerLiteral [[ADDR_137:0x[a-z0-9]*]] <col:22> 'int' 0
// CHECK-NEXT: | | | `-CallExpr [[ADDR_138:0x[a-z0-9]*]] <col:27, col:39> 'int'
// CHECK-NEXT: | | | |-ImplicitCastExpr [[ADDR_139:0x[a-z0-9]*]] <col:27> 'int (*)(int)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr [[ADDR_140:0x[a-z0-9]*]] <col:27> 'int (int)' {{.*}}Function [[ADDR_118]] 'also_after' 'int (int)' (FunctionTemplate [[ADDR_111]] 'also_after')
// CHECK-NEXT: | | | `-IntegerLiteral [[ADDR_141:0x[a-z0-9]*]] <col:38> 'int' 0
// CHECK-NEXT: | | `-CallExpr [[ADDR_142:0x[a-z0-9]*]] <col:43, col:57> 'int'
// CHECK-NEXT: | | |-ImplicitCastExpr [[ADDR_143:0x[a-z0-9]*]] <col:43> 'int (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr [[ADDR_144:0x[a-z0-9]*]] <col:43> 'int (double)' {{.*}}Function [[ADDR_36]] 'also_before' 'int (double)' (FunctionTemplate [[ADDR_22]] 'also_before')
// CHECK-NEXT: | | `-FloatingLiteral [[ADDR_145:0x[a-z0-9]*]] <col:55> 'double' 0.000000e+00
// CHECK-NEXT: | `-CallExpr [[ADDR_146:0x[a-z0-9]*]] <col:61, col:74> 'int'
// CHECK-NEXT: | |-ImplicitCastExpr [[ADDR_147:0x[a-z0-9]*]] <col:61> 'int (*)(double)' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_148:0x[a-z0-9]*]] <col:61> 'int (double)' {{.*}}Function [[ADDR_122]] 'also_after' 'int (double)' (FunctionTemplate [[ADDR_111]] 'also_after')
// CHECK-NEXT: | `-FloatingLiteral [[ADDR_149:0x[a-z0-9]*]] <col:72> 'double' 0.000000e+00
// CHECK-NEXT: `-PseudoObjectExpr [[ADDR_150:0x[a-z0-9]*]] <col:78, col:98> 'int'
// CHECK-NEXT: |-CallExpr [[ADDR_151:0x[a-z0-9]*]] <col:78, col:98> 'int'
// CHECK-NEXT: | |-ImplicitCastExpr [[ADDR_152:0x[a-z0-9]*]] <col:78> 'int (*)(S<int>)' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_153:0x[a-z0-9]*]] <col:78> 'int (S<int>)' {{.*}}Function [[ADDR_65]] 'special' 'int (S<int>)' (FunctionTemplate [[ADDR_58]] 'special')
// CXX11-NEXT: | `-CXXConstructExpr [[ADDR_154:0x[a-z0-9]*]] <col:86, col:97> 'S<int>' 'void (S<int> &&) noexcept' elidable
// CXX11-NEXT: | `-MaterializeTemporaryExpr [[ADDR_155:0x[a-z0-9]*]] <col:86, col:97> 'S<int>' xvalue
// CHECK-NEXT: | `-CXXTemporaryObjectExpr [[ADDR_156:0x[a-z0-9]*]] <col:86, col:97> 'S<int>' 'void (int, int *)'
// CHECK-NEXT: | |-IntegerLiteral [[ADDR_157:0x[a-z0-9]*]] <col:93> 'int' 0
// CHECK-NEXT: | `-ImplicitCastExpr [[ADDR_158:0x[a-z0-9]*]] <col:96> 'int *' <NullToPointer>
// CHECK-NEXT: | `-IntegerLiteral [[ADDR_159:0x[a-z0-9]*]] <col:96> 'int' 0
// CHECK-NEXT: `-CallExpr [[ADDR_160:0x[a-z0-9]*]] <line:23:1, line:44:98> 'int'
// CHECK-NEXT: |-ImplicitCastExpr [[ADDR_161:0x[a-z0-9]*]] <line:23:1> 'int (*)(S<int>)' <FunctionToPointerDecay>
// CHECK-NEXT: | `-DeclRefExpr [[ADDR_68]] <col:1> 'int (S<int>)' {{.*}}Function [[ADDR_69]] 'special[implementation={extension(allow_templates)}]' 'int (S<int>)'
// CXX11-NEXT: `-CXXConstructExpr [[ADDR_162:0x[a-z0-9]*]] <line:44:86, col:97> 'S<int>' 'void (S<int> &&) noexcept' elidable
// CXX11-NEXT: `-MaterializeTemporaryExpr [[ADDR_163:0x[a-z0-9]*]] <col:86, col:97> 'S<int>' xvalue
// CXX11-NEXT: `-CXXTemporaryObjectExpr [[ADDR_156]] <col:86, col:97> 'S<int>' 'void (int, int *)'
// CXX17-NEXT: `-CXXTemporaryObjectExpr [[ADDR_156]] <line:[[#]]:86, col:97> 'S<int>' 'void (int, int *)'
// CHECK-NEXT: |-IntegerLiteral [[ADDR_157]] <col:93> 'int' 0
// CHECK-NEXT: `-ImplicitCastExpr [[ADDR_158]] <col:96> 'int *' <NullToPointer>
// CHECK-NEXT: `-IntegerLiteral [[ADDR_159]] <col:96> 'int' 0
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