[OpenMP] Specialize OpenMP calls after template instantiation

[jdoerfert]

Summary

As with regular calls, we want to specialize a call that went through
template instantiation if it has an applicable OpenMP declare variant.

[mikerice]

clang/lib/Sema/SemaTemplateInstantiate.cpp

1698

Is there a parent change that removed the Sema& parameter from this function?

[jdoerfert]

clang/lib/Sema/SemaTemplateInstantiate.cpp

1698

Yes, locally. I was going to submit is as a NFC patch later today. The parameter was a leftover I simply forgot to remove when I made it a member.

[jdoerfert]

Rebase on D77252

[mikerice]

clang/lib/Sema/SemaTemplateInstantiate.cpp

1693

Is there a reason you are adding this here as opposed to in the base class RebuildCallExpr? Are there cases where we rebuild call expressions that we don't want to do this variant processing?

1698

Comments on nullptr arguments would be nice.

[jdoerfert]

rebase

[jdoerfert]

clang/lib/Sema/SemaTemplateInstantiate.cpp

1693

I just didn't know about it. I'll move the code there.

[jdoerfert]

Move code as suggested

[mikerice]

clang/lib/Sema/SemaExprCXX.cpp

8260 ↗

(On Diff #255524)

I was expecting the code would be added to RebuildCallExpr in TreeTransform.h. This seems to just override one of the classes derived from TreeTransform.

I think I'd try adding it to TreeTransform then check all the cases where a subclass overrides RebuildCallExpr and try to determine if something needs to be done there.

[jdoerfert]

clang/lib/Sema/SemaExprCXX.cpp

8260 ↗

(On Diff #255524)

I'm not paying attention -.-

This is the one class that overrides RebuildCallExpr in clang and obviously not the right place for this. I will put it in TreeTransform::RebuildCallExpr which is in clang/lib/Sema/TreeTransform.h now.

[jdoerfert]

Override RebuildCallExpr in the template instantiation and specialize calls only there.

[jdoerfert]

I figured in TreeTransform everyone would get this behavior but actually only template instantiation wants it so I put it there instead. Do you think it is better placed in the generic TreeTransform code after all?
At least this time I verified the test passes. Sorry for that btw.

EDIT: But the test system on phab seems to disagree. I'll check again.

[mikerice]

My reasoning is that the generic TreeTransform does semantic analysis on CallExpr and this seems to be related semantic analysis that would need to be redone when the call changed as well. Say someone codes up a new subclass of TreeTransform that maybe changes one of the arguments. If ActOnOpenMPCall is not called does that create a broken AST?

So it is not clear to me that only template instantiation wants it. I don't claim to be an expert on this code but if I subclassed TreeTransform I wouldn't expect to have to rewrite this OpenMP code each time I modified the base call expression. We could probably use more opinions on this in any case.

[jdoerfert]

Move specializtion to the TreeTransformer

[erichkeane]

clang/lib/Sema/TreeTransform.h

2414 ↗

(On Diff #255709)

It seems to me that this logic would better fit in 'ActOnCallExpr' if at all possible, and RebuildCallExpr should just call ActOnCallExpr. I see there is a warning implemented there (a strange place for that), but if this doesn't cause conflicts I would expect that to be the behavior here.

2418 ↗

(On Diff #255709)

What would BuildCallExpr return that is both valid/usable and NOT a callexpr? I'm not sure this check needs to be here.

[jdoerfert]

clang/lib/Sema/TreeTransform.h

2414 ↗

(On Diff #255709)

The logic is in ActOnCallExpr so if I can call that here it should work just fine.

[jdoerfert]

Reuse ActOnCallExpr, which contains the necessary logic (and a warning which we tried to avoid before).

[erichkeane]

From the CFE perspective, all this looks OK to me. But please give @mikerice a couple hours before committing to do a final set of comments to make sure the OMP examples are sufficient for him (or any final objections).

[mikerice]

This looks like the right change to me.

clang/lib/Sema/SemaTemplateInstantiate.cpp

TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
                           SourceLocation NameLoc,
                           QualType ObjectType = QualType(),
                           NamedDecl *FirstQualifierInScope = nullptr,
                           bool AllowInjectedClassName = false);
 
     const LoopHintAttr *TransformLoopHintAttr(const LoopHintAttr *LH);
 
     ExprResult TransformPredefinedExpr(PredefinedExpr *E);
+    ExprResult TransformCallExpr(CallExpr *E);
     ExprResult TransformDeclRefExpr(DeclRefExpr *E);
     ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);
 
     ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E,
                                             NonTypeTemplateParmDecl *D);
     ExprResult TransformSubstNonTypeTemplateParmPackExpr(
                                            SubstNonTypeTemplateParmPackExpr *E);
     ExprResult TransformSubstNonTypeTemplateParmExpr(
TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
   } else {
     TransformedDecl = Found->get<Decl*>();
   }
 
   // We have either an unexpanded pack or a specific expansion.
   return RebuildVarDeclRefExpr(cast<VarDecl>(TransformedDecl), E->getExprLoc());
 }
 
+ExprResult TemplateInstantiator::TransformCallExpr(CallExpr *E) {
+  ExprResult R = TreeTransform<TemplateInstantiator>::TransformCallExpr(E);
+  if (!SemaRef.getLangOpts().OpenMP || !R.isUsable() || !isa<CallExpr>(R.get()))
+    return R;
+
+  auto *CE = cast<CallExpr>(R.get());
+  return SemaRef.ActOnOpenMPCall(R, nullptr, CE->getRParenLoc(),
+                                 MultiExprArg(CE->getArgs(), CE->getNumArgs()),
+                                 CE->getRParenLoc(), nullptr);
+}
+
 ExprResult
 TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
   NamedDecl *D = E->getDecl();
 
   // Handle references to non-type template parameters and non-type template
   // parameter packs.
   if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
     if (NTTP->getDepth() < TemplateArgs.getNumLevels())

clang/test/AST/ast-dump-openmp-begin-declare-variant_template_1.cpp

+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fopenmp -verify -ast-dump %s       | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fopenmp -verify -ast-dump %s -x c++| FileCheck %s
+// expected-no-diagnostics
+
+int also_before() {
+  return 1;
+}
+
+#pragma omp begin declare variant match(implementation={vendor(score(100):llvm)})
+int also_after(void) {
+  return 2;
+}
+int also_after(int) {
+  return 3;
+}
+int also_after(double) {
+  return 0;
+}
+#pragma omp end declare variant
+#pragma omp begin declare variant match(implementation={vendor(score(0):llvm)})
+int also_before() {
+  return 0;
+}
+#pragma omp end declare variant
+
+int also_after(void) {
+  return 4;
+}
+int also_after(int) {
+  return 5;
+}
+int also_after(double) {
+  return 6;
+}
+
+template<typename T>
+int test1() {
+  // Should return 0.
+  return also_after(T(0));
+}
+
+typedef int(*Ty)();
+
+template<Ty fn>
+int test2() {
+  // Should return 0.
+  return fn();
+}
+
+int test() {
+  // Should return 0.
+  return test1<double>() + test2<also_before>();
+}
+
+// CHECK:      |-FunctionDecl [[ADDR_0:0x[a-z0-9]*]] <{{.*}}, line:7:1> line:5:5 used also_before 'int ({{.*}})'
+// CHECK-NEXT: | |-CompoundStmt [[ADDR_1:0x[a-z0-9]*]] <col:19, line:7:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_2:0x[a-z0-9]*]] <line:6:3, col:10>
+// CHECK-NEXT: | |   `-IntegerLiteral [[ADDR_3:0x[a-z0-9]*]] <col:10> 'int' 1
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_4:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={vendor(score(0): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_5:0x[a-z0-9]*]] <line:21:1> 'int ({{.*}})' Function [[ADDR_6:0x[a-z0-9]*]] 'also_before[implementation={vendor(llvm)}]' 'int ({{.*}})'
+// CHECK-NEXT: |-FunctionDecl [[ADDR_7:0x[a-z0-9]*]] <line:10:1, col:20> col:5 implicit also_after 'int ({{.*}})'
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_8:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={vendor(score(100): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_9:0x[a-z0-9]*]] <col:1> 'int ({{.*}})' Function [[ADDR_10:0x[a-z0-9]*]] 'also_after[implementation={vendor(llvm)}]' 'int ({{.*}})'
+// CHECK-NEXT: |-FunctionDecl [[ADDR_10]] <col:1, line:12:1> line:10:1 also_after[implementation={vendor(llvm)}] 'int ({{.*}})'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_11:0x[a-z0-9]*]] <col:22, line:12:1>
+// CHECK-NEXT: |   `-ReturnStmt [[ADDR_12:0x[a-z0-9]*]] <line:11:3, col:10>
+// CHECK-NEXT: |     `-IntegerLiteral [[ADDR_13:0x[a-z0-9]*]] <col:10> 'int' 2
+// CHECK-NEXT: |-FunctionDecl [[ADDR_14:0x[a-z0-9]*]] <line:13:1, col:19> col:5 implicit also_after 'int (int)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_15:0x[a-z0-9]*]] <col:16> col:19 'int'
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_16:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={vendor(score(100): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_17:0x[a-z0-9]*]] <col:1> 'int (int)' Function [[ADDR_18:0x[a-z0-9]*]] 'also_after[implementation={vendor(llvm)}]' 'int (int)'
+// CHECK-NEXT: |-FunctionDecl [[ADDR_18]] <col:1, line:15:1> line:13:1 also_after[implementation={vendor(llvm)}] 'int (int)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_15]] <col:16> col:19 'int'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_19:0x[a-z0-9]*]] <col:21, line:15:1>
+// CHECK-NEXT: |   `-ReturnStmt [[ADDR_20:0x[a-z0-9]*]] <line:14:3, col:10>
+// CHECK-NEXT: |     `-IntegerLiteral [[ADDR_21:0x[a-z0-9]*]] <col:10> 'int' 3
+// CHECK-NEXT: |-FunctionDecl [[ADDR_22:0x[a-z0-9]*]] <line:16:1, col:22> col:5 implicit used also_after 'int (double)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_23:0x[a-z0-9]*]] <col:16> col:22 'double'
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_24:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={vendor(score(100): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_25:0x[a-z0-9]*]] <col:1> 'int (double)' Function [[ADDR_26:0x[a-z0-9]*]] 'also_after[implementation={vendor(llvm)}]' 'int (double)'
+// CHECK-NEXT: |-FunctionDecl [[ADDR_26]] <col:1, line:18:1> line:16:1 also_after[implementation={vendor(llvm)}] 'int (double)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_23]] <col:16> col:22 'double'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_27:0x[a-z0-9]*]] <col:24, line:18:1>
+// CHECK-NEXT: |   `-ReturnStmt [[ADDR_28:0x[a-z0-9]*]] <line:17:3, col:10>
+// CHECK-NEXT: |     `-IntegerLiteral [[ADDR_29:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionDecl [[ADDR_6]] <line:21:1, line:23:1> line:21:1 also_before[implementation={vendor(llvm)}] 'int ({{.*}})'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_30:0x[a-z0-9]*]] <col:19, line:23:1>
+// CHECK-NEXT: |   `-ReturnStmt [[ADDR_31:0x[a-z0-9]*]] <line:22:3, col:10>
+// CHECK-NEXT: |     `-IntegerLiteral [[ADDR_32:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionDecl [[ADDR_33:0x[a-z0-9]*]] prev [[ADDR_7]] <line:26:1, line:28:1> line:26:5 also_after 'int ({{.*}})'
+// CHECK-NEXT: | |-CompoundStmt [[ADDR_34:0x[a-z0-9]*]] <col:22, line:28:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_35:0x[a-z0-9]*]] <line:27:3, col:10>
+// CHECK-NEXT: | |   `-IntegerLiteral [[ADDR_36:0x[a-z0-9]*]] <col:10> 'int' 4
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_37:0x[a-z0-9]*]] <<invalid sloc>> Inherited Implicit implementation={vendor(score(100): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_9]] <line:10:1> 'int ({{.*}})' Function [[ADDR_10]] 'also_after[implementation={vendor(llvm)}]' 'int ({{.*}})'
+// CHECK-NEXT: |-FunctionDecl [[ADDR_38:0x[a-z0-9]*]] prev [[ADDR_14]] <line:29:1, line:31:1> line:29:5 also_after 'int (int)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_39:0x[a-z0-9]*]] <col:16> col:19 'int'
+// CHECK-NEXT: | |-CompoundStmt [[ADDR_40:0x[a-z0-9]*]] <col:21, line:31:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_41:0x[a-z0-9]*]] <line:30:3, col:10>
+// CHECK-NEXT: | |   `-IntegerLiteral [[ADDR_42:0x[a-z0-9]*]] <col:10> 'int' 5
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_43:0x[a-z0-9]*]] <<invalid sloc>> Inherited Implicit implementation={vendor(score(100): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_17]] <line:13:1> 'int (int)' Function [[ADDR_18]] 'also_after[implementation={vendor(llvm)}]' 'int (int)'
+// CHECK-NEXT: |-FunctionDecl [[ADDR_44:0x[a-z0-9]*]] prev [[ADDR_22]] <line:32:1, line:34:1> line:32:5 used also_after 'int (double)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_45:0x[a-z0-9]*]] <col:16> col:22 'double'
+// CHECK-NEXT: | |-CompoundStmt [[ADDR_46:0x[a-z0-9]*]] <col:24, line:34:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_47:0x[a-z0-9]*]] <line:33:3, col:10>
+// CHECK-NEXT: | |   `-IntegerLiteral [[ADDR_48:0x[a-z0-9]*]] <col:10> 'int' 6
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_49:0x[a-z0-9]*]] <<invalid sloc>> Inherited Implicit implementation={vendor(score(100): llvm)}
+// CHECK-NEXT: |   `-DeclRefExpr [[ADDR_25]] <line:16:1> 'int (double)' Function [[ADDR_26]] 'also_after[implementation={vendor(llvm)}]' 'int (double)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_50:0x[a-z0-9]*]] <line:36:1, line:40:1> line:37:5 test1
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_51:0x[a-z0-9]*]] <line:36:10, col:19> col:19 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_52:0x[a-z0-9]*]] <line:37:1, line:40:1> line:37:5 test1 'int ({{.*}})'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_53:0x[a-z0-9]*]] <col:13, line:40:1>
+// CHECK-NEXT: | |   `-ReturnStmt [[ADDR_54:0x[a-z0-9]*]] <line:39:3, col:25>
+// CHECK-NEXT: | |     `-CallExpr [[ADDR_55:0x[a-z0-9]*]] <col:10, col:25> '<dependent type>'
+// CHECK-NEXT: | |       |-UnresolvedLookupExpr [[ADDR_56:0x[a-z0-9]*]] <col:10> '<overloaded function type>' {{.*}}(ADL) = 'also_after' [[ADDR_44]] [[ADDR_38]] [[ADDR_33]]
+// CHECK-NEXT: | |       `-CXXUnresolvedConstructExpr [[ADDR_57:0x[a-z0-9]*]] <col:21, col:24> 'T' 'T'
+// CHECK-NEXT: | |         `-IntegerLiteral [[ADDR_58:0x[a-z0-9]*]] <col:23> 'int' 0
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_59:0x[a-z0-9]*]] <line:37:1, line:40:1> line:37:5 used test1 'int ({{.*}})'
+// CHECK-NEXT: |   |-TemplateArgument type 'double'
+// CHECK-NEXT: |   `-CompoundStmt [[ADDR_60:0x[a-z0-9]*]] <col:13, line:40:1>
+// CHECK-NEXT: |     `-ReturnStmt [[ADDR_61:0x[a-z0-9]*]] <line:39:3, col:25>
+// CHECK-NEXT: |       `-PseudoObjectExpr [[ADDR_62:0x[a-z0-9]*]] <col:10, col:25> 'int'
+// CHECK-NEXT: |         |-CallExpr [[ADDR_63:0x[a-z0-9]*]] <col:10, col:25> 'int'
+// CHECK-NEXT: |         | |-ImplicitCastExpr [[ADDR_64:0x[a-z0-9]*]] <col:10> 'int (*)(double)' <FunctionToPointerDecay>
+// CHECK-NEXT: |         | | `-DeclRefExpr [[ADDR_65:0x[a-z0-9]*]] <col:10> 'int (double)' {{.*}}Function [[ADDR_44]] 'also_after' 'int (double)'
+// CHECK-NEXT: |         | `-CXXFunctionalCastExpr [[ADDR_66:0x[a-z0-9]*]] <col:21, col:24> 'double':'double' functional cast to double <NoOp>
+// CHECK-NEXT: |         |   `-ImplicitCastExpr [[ADDR_67:0x[a-z0-9]*]] <col:23> 'double':'double' <IntegralToFloating> part_of_explicit_cast
+// CHECK-NEXT: |         |     `-IntegerLiteral [[ADDR_58]] <col:23> 'int' 0
+// CHECK-NEXT: |         `-CallExpr [[ADDR_68:0x[a-z0-9]*]] <line:16:1, line:39:25> 'int'
+// CHECK-NEXT: |           |-ImplicitCastExpr [[ADDR_69:0x[a-z0-9]*]] <line:16:1> 'int (*)(double)' <FunctionToPointerDecay>
+// CHECK-NEXT: |           | `-DeclRefExpr [[ADDR_25]] <col:1> 'int (double)' Function [[ADDR_26]] 'also_after[implementation={vendor(llvm)}]' 'int (double)'
+// CHECK-NEXT: |           `-CXXFunctionalCastExpr [[ADDR_66]] <line:39:21, col:24> 'double':'double' functional cast to double <NoOp>
+// CHECK-NEXT: |             `-ImplicitCastExpr [[ADDR_67]] <col:23> 'double':'double' <IntegralToFloating> part_of_explicit_cast
+// CHECK-NEXT: |               `-IntegerLiteral [[ADDR_58]] <col:23> 'int' 0
+// CHECK-NEXT: |-TypedefDecl [[ADDR_70:0x[a-z0-9]*]] <line:42:1, col:18> col:14 referenced Ty 'int (*)({{.*}})'
+// CHECK-NEXT: | `-PointerType [[ADDR_71:0x[a-z0-9]*]] 'int (*)({{.*}})'
+// CHECK-NEXT: |   `-ParenType [[ADDR_72:0x[a-z0-9]*]] 'int ({{.*}})' sugar
+// CHECK-NEXT: |     `-FunctionProtoType [[ADDR_73:0x[a-z0-9]*]] 'int ({{.*}})' cdecl
+// CHECK-NEXT: |       `-BuiltinType [[ADDR_74:0x[a-z0-9]*]] 'int'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_75:0x[a-z0-9]*]] <line:44:1, line:48:1> line:45:5 test2
+// CHECK-NEXT: | |-NonTypeTemplateParmDecl [[ADDR_76:0x[a-z0-9]*]] <line:44:10, col:13> col:13 referenced 'Ty':'int (*)({{.*}})' depth 0 index 0 fn
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_77:0x[a-z0-9]*]] <line:45:1, line:48:1> line:45:5 test2 'int ({{.*}})'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_78:0x[a-z0-9]*]] <col:13, line:48:1>
+// CHECK-NEXT: | |   `-ReturnStmt [[ADDR_79:0x[a-z0-9]*]] <line:47:3, col:13>
+// CHECK-NEXT: | |     `-CallExpr [[ADDR_80:0x[a-z0-9]*]] <col:10, col:13> 'int'
+// CHECK-NEXT: | |       `-DeclRefExpr [[ADDR_81:0x[a-z0-9]*]] <col:10> 'Ty':'int (*)({{.*}})' NonTypeTemplateParm [[ADDR_76]] 'fn' 'Ty':'int (*)({{.*}})'
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_82:0x[a-z0-9]*]] <line:45:1, line:48:1> line:45:5 used test2 'int ({{.*}})'
+// CHECK-NEXT: |   |-TemplateArgument decl
+// CHECK-NEXT: |   | `-Function [[ADDR_0]] 'also_before' 'int ({{.*}})'
+// CHECK-NEXT: |   `-CompoundStmt [[ADDR_83:0x[a-z0-9]*]] <col:13, line:48:1>
+// CHECK-NEXT: |     `-ReturnStmt [[ADDR_84:0x[a-z0-9]*]] <line:47:3, col:13>
+// CHECK-NEXT: |       `-PseudoObjectExpr [[ADDR_85:0x[a-z0-9]*]] <col:10, col:13> 'int'
+// CHECK-NEXT: |         |-CallExpr [[ADDR_86:0x[a-z0-9]*]] <col:10, col:13> 'int'
+// CHECK-NEXT: |         | `-SubstNonTypeTemplateParmExpr [[ADDR_87:0x[a-z0-9]*]] <col:10> 'int (*)({{.*}})'
+// CHECK-NEXT: |         |   `-UnaryOperator [[ADDR_88:0x[a-z0-9]*]] <col:10> 'int (*)({{.*}})' prefix '&' cannot overflow
+// CHECK-NEXT: |         |     `-DeclRefExpr [[ADDR_89:0x[a-z0-9]*]] <col:10> 'int ({{.*}})' {{.*}}Function [[ADDR_0]] 'also_before' 'int ({{.*}})'
+// CHECK-NEXT: |         `-CallExpr [[ADDR_90:0x[a-z0-9]*]] <line:21:1, line:47:13> 'int'
+// CHECK-NEXT: |           `-ImplicitCastExpr [[ADDR_91:0x[a-z0-9]*]] <line:21:1> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT: |             `-DeclRefExpr [[ADDR_5]] <col:1> 'int ({{.*}})' Function [[ADDR_6]] 'also_before[implementation={vendor(llvm)}]' 'int ({{.*}})'
+// CHECK-NEXT: `-FunctionDecl [[ADDR_92:0x[a-z0-9]*]] <line:50:1, line:53:1> line:50:5 test 'int ({{.*}})'
+// CHECK-NEXT:   `-CompoundStmt [[ADDR_93:0x[a-z0-9]*]] <col:12, line:53:1>
+// CHECK-NEXT:     `-ReturnStmt [[ADDR_94:0x[a-z0-9]*]] <line:52:3, col:47>
+// CHECK-NEXT:       `-BinaryOperator [[ADDR_95:0x[a-z0-9]*]] <col:10, col:47> 'int' '+'
+// CHECK-NEXT:         |-CallExpr [[ADDR_96:0x[a-z0-9]*]] <col:10, col:24> 'int'
+// CHECK-NEXT:         | `-ImplicitCastExpr [[ADDR_97:0x[a-z0-9]*]] <col:10, col:22> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT:         |   `-DeclRefExpr [[ADDR_98:0x[a-z0-9]*]] <col:10, col:22> 'int ({{.*}})' {{.*}}Function [[ADDR_59]] 'test1' 'int ({{.*}})' (FunctionTemplate [[ADDR_50]] 'test1')
+// CHECK-NEXT:         `-CallExpr [[ADDR_99:0x[a-z0-9]*]] <col:28, col:47> 'int'
+// CHECK-NEXT:           `-ImplicitCastExpr [[ADDR_100:0x[a-z0-9]*]] <col:28, col:45> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT:             `-DeclRefExpr [[ADDR_101:0x[a-z0-9]*]] <col:28, col:45> 'int ({{.*}})' {{.*}}Function [[ADDR_82]] 'test2' 'int ({{.*}})' (FunctionTemplate [[ADDR_75]] 'test2')