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llvm-project/clang/test/ASTSYCL/ast-dump-sycl-kernel-call-stmt.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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// Tests without serialization:
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown -fsycl-is-device \
// RUN: -ast-dump %s \
// RUN: | FileCheck --match-full-lines %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown -fsycl-is-host \
// RUN: -ast-dump %s \
// RUN: | FileCheck --match-full-lines %s
//
// Tests with serialization:
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown -fsycl-is-device \
// RUN: -emit-pch -o %t %s
// RUN: %clang_cc1 -x c++ -std=c++17 -triple x86_64-unknown-unknown -fsycl-is-device \
// RUN: -include-pch %t -ast-dump-all /dev/null \
// RUN: | sed -e "s/ <undeserialized declarations>//" -e "s/ imported//" \
// RUN: | FileCheck --match-full-lines %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown -fsycl-is-host \
// RUN: -emit-pch -o %t %s
// RUN: %clang_cc1 -x c++ -std=c++17 -triple x86_64-unknown-unknown -fsycl-is-host \
// RUN: -include-pch %t -ast-dump-all /dev/null \
// RUN: | sed -e "s/ <undeserialized declarations>//" -e "s/ imported//" \
// RUN: | FileCheck --match-full-lines %s
// These tests validate the AST body produced for functions declared with the
// sycl_kernel_entry_point attribute.
// CHECK: TranslationUnitDecl {{.*}}
// A unique kernel name type is required for each declared kernel entry point.
template<int> struct KN;
// A unique invocable type for use with each declared kernel entry point.
template<int> struct K {
template<typename... Ts>
void operator()(Ts...) const {}
};
[[clang::sycl_kernel_entry_point(KN<1>)]]
void skep1() {
}
// CHECK: |-FunctionDecl {{.*}} skep1 'void ()'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<1>
template<typename KNT, typename KT>
[[clang::sycl_kernel_entry_point(KNT)]]
void skep2(KT k) {
k();
}
template
void skep2<KN<2>>(K<2>);
// CHECK: |-FunctionTemplateDecl {{.*}} skep2
// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} KNT
// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} KT
// CHECK-NEXT: | |-FunctionDecl {{.*}} skep2 'void (KT)'
// CHECK-NEXT: | | |-ParmVarDecl {{.*}} k 'KT'
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CallExpr {{.*}} '<dependent type>'
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'KT' lvalue ParmVar {{.*}} 'k' 'KT'
// CHECK-NEXT: | | `-SYCLKernelEntryPointAttr {{.*}} KNT
// CHECK-NEXT: | `-FunctionDecl {{.*}} skep2 'void (K<2>)' explicit_instantiation_definition
// CHECK-NEXT: | |-TemplateArgument type 'KN<2>'
// CHECK-NEXT: | | `-RecordType {{.*}} 'KN<2>' canonical
// CHECK-NEXT: | | `-ClassTemplateSpecialization {{.*}} 'KN'
// CHECK-NEXT: | |-TemplateArgument type 'K<2>'
// CHECK-NEXT: | | `-RecordType {{.*}} 'K<2>' canonical
// CHECK-NEXT: | | `-ClassTemplateSpecialization {{.*}} 'K'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} k 'K<2>'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const K<2>' lvalue <NoOp>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'K<2>' lvalue ParmVar {{.*}} 'k' 'K<2>'
// CHECK-NEXT: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used k 'K<2>'
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const K<2>' lvalue <NoOp>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'K<2>' lvalue ImplicitParam {{.*}} 'k' 'K<2>'
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<2>
template<typename KNT, typename KT>
[[clang::sycl_kernel_entry_point(KNT)]]
void skep3(KT k) {
k();
}
template<>
[[clang::sycl_kernel_entry_point(KN<3>)]]
void skep3<KN<3>>(K<3> k) {
k();
}
// CHECK: |-FunctionTemplateDecl {{.*}} skep3
// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} KNT
// CHECK-NEXT: | |-TemplateTypeParmDecl {{.*}} KT
// CHECK-NEXT: | |-FunctionDecl {{.*}} skep3 'void (KT)'
// CHECK-NEXT: | | |-ParmVarDecl {{.*}} k 'KT'
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CallExpr {{.*}} '<dependent type>'
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'KT' lvalue ParmVar {{.*}} 'k' 'KT'
// CHECK-NEXT: | | `-SYCLKernelEntryPointAttr {{.*}} KNT
// CHECK-NEXT: | `-Function {{.*}} 'skep3' 'void (K<3>)'
// CHECK-NEXT: |-FunctionDecl {{.*}} skep3 'void (K<3>)' explicit_specialization
// CHECK-NEXT: | |-TemplateArgument type 'KN<3>'
// CHECK-NEXT: | | `-RecordType {{.*}} 'KN<3>' canonical
// CHECK-NEXT: | | `-ClassTemplateSpecialization {{.*}} 'KN'
// CHECK-NEXT: | |-TemplateArgument type 'K<3>'
// CHECK-NEXT: | | `-RecordType {{.*}} 'K<3>' canonical
// CHECK-NEXT: | | `-ClassTemplateSpecialization {{.*}} 'K'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} k 'K<3>'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const K<3>' lvalue <NoOp>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'K<3>' lvalue ParmVar {{.*}} 'k' 'K<3>'
// CHECK-NEXT: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used k 'K<3>'
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const K<3>' lvalue <NoOp>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'K<3>' lvalue ImplicitParam {{.*}} 'k' 'K<3>'
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<3>
[[clang::sycl_kernel_entry_point(KN<4>)]]
void skep4(K<4> k, int p1, int p2) {
k(p1, p2);
}
// CHECK: |-FunctionDecl {{.*}} skep4 'void (K<4>, int, int)'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} k 'K<4>'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} p1 'int'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} p2 'int'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'void (*)(int, int) const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'void (int, int) const' lvalue CXXMethod {{.*}} 'operator()' 'void (int, int) const'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'const K<4>' lvalue <NoOp>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'K<4>' lvalue ParmVar {{.*}} 'k' 'K<4>'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'int' lvalue ParmVar {{.*}} 'p1' 'int'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'int' lvalue ParmVar {{.*}} 'p2' 'int'
// CHECK-NEXT: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used k 'K<4>'
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used p1 'int'
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used p2 'int'
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'void (*)(int, int) const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'void (int, int) const' lvalue CXXMethod {{.*}} 'operator()' 'void (int, int) const'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const K<4>' lvalue <NoOp>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'K<4>' lvalue ImplicitParam {{.*}} 'k' 'K<4>'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'int' lvalue ImplicitParam {{.*}} 'p1' 'int'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'int' lvalue ImplicitParam {{.*}} 'p2' 'int'
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<4>
[[clang::sycl_kernel_entry_point(KN<5>)]]
void skep5(int unused1, K<5> k, int unused2, int p, int unused3) {
static int slv = 0;
int lv = 4;
k(slv, 1, p, 3, lv, 5, []{ return 6; });
}
// CHECK: |-FunctionDecl {{.*}} skep5 'void (int, K<5>, int, int, int)'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} unused1 'int'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} used k 'K<5>'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} unused2 'int'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} used p 'int'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} unused3 'int'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit unused1 'int'
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used k 'K<5>'
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit unused2 'int'
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used p 'int'
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit unused3 'int'
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | | |-DeclStmt {{.*}}
// CHECK-NEXT: | | | `-VarDecl {{.*}} used slv 'int' static cinit
// CHECK-NEXT: | | | `-IntegerLiteral {{.*}} 'int' 0
// CHECK-NEXT: | | |-DeclStmt {{.*}}
// CHECK-NEXT: | | | `-VarDecl {{.*}} used lv 'int' cinit
// CHECK-NEXT: | | | `-IntegerLiteral {{.*}} 'int' 4
// CHECK-NEXT: | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'void (*)(int, int, int, int, int, int, (lambda {{.*}}) const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'void (int, int, int, int, int, int, (lambda {{.*}})) const' lvalue CXXMethod {{.*}} 'operator()' 'void (int, int, int, int, int, int, (lambda {{.*}})) const'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const K<5>' lvalue <NoOp>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'K<5>' lvalue ImplicitParam {{.*}} 'k' 'K<5>'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'int' lvalue Var {{.*}} 'slv' 'int'
// CHECK-NEXT: | | |-IntegerLiteral {{.*}} 'int' 1
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'int' lvalue ImplicitParam {{.*}} 'p' 'int'
// CHECK-NEXT: | | |-IntegerLiteral {{.*}} 'int' 3
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'int' <LValueToRValue>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'int' lvalue Var {{.*}} 'lv' 'int'
// CHECK-NEXT: | | |-IntegerLiteral {{.*}} 'int' 5
// CHECK-NEXT: | | `-LambdaExpr {{.*}} '(lambda {{.*}})'
// CHECK: | `-SYCLKernelEntryPointAttr {{.*}} KN<5>
struct S6 {
void operator()() const;
};
[[clang::sycl_kernel_entry_point(KN<6>)]]
void skep6(const S6 &k) {
k();
}
// CHECK: |-FunctionDecl {{.*}} skep6 'void (const S6 &)'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} used k 'const S6 &'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'const S6' lvalue ParmVar {{.*}} 'k' 'const S6 &'
// CHECK-NEXT: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used k 'const S6 &'
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'const S6' lvalue ImplicitParam {{.*}} 'k' 'const S6 &'
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<6>
// Parameter types are not required to be complete at the point of a
// non-defining declaration.
struct S7;
[[clang::sycl_kernel_entry_point(KN<7>)]]
void skep7(S7 k);
struct S7 {
void operator()() const;
};
[[clang::sycl_kernel_entry_point(KN<7>)]]
void skep7(S7 k) {
k();
}
// CHECK: |-FunctionDecl {{.*}} skep7 'void (S7)'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} k 'S7'
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<7>
// CHECK: |-FunctionDecl {{.*}} prev {{.*}} skep7 'void (S7)'
// CHECK-NEXT: | |-ParmVarDecl {{.*}} used k 'S7'
// CHECK-NEXT: | |-SYCLKernelCallStmt {{.*}}
// CHECK-NEXT: | | |-CompoundStmt {{.*}}
// CHECK-NEXT: | | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const S7' lvalue <NoOp>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'S7' lvalue ParmVar {{.*}} 'k' 'S7'
// CHECK-NEXT: | | `-OutlinedFunctionDecl {{.*}}
// CHECK-NEXT: | | |-ImplicitParamDecl {{.*}} implicit used k 'S7'
// CHECK-NEXT: | | `-CompoundStmt {{.*}}
// CHECK-NEXT: | | `-CXXOperatorCallExpr {{.*}} 'void' '()'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'void (*)() const' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'void () const' lvalue CXXMethod {{.*}} 'operator()' 'void () const'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const S7' lvalue <NoOp>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'S7' lvalue ImplicitParam {{.*}} 'k' 'S7'
// CHECK-NEXT: | `-SYCLKernelEntryPointAttr {{.*}} KN<7>
void the_end() {}
// CHECK: `-FunctionDecl {{.*}} the_end 'void ()'
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