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[clang][TypePrinter] Replace AppendScope with printNestedNameSpecifier #168534

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merged 3 commits into from
Nov 21, 2025
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[clang][TypePrinter] Replace AppendScope with printNestedNameSpecifier #168534

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e89ba0b
[clang][TypePrinter] Replace AppendScope with printNestedNameSpecifier
Michael137 Nov 14, 2025
9fba42d
fixup! add test-case for function scope with parameters
Michael137 Nov 19, 2025
8d3ff0e
fixup! make dedicated unit-test
Michael137 Nov 20, 2025
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3 changes: 3 additions & 0 deletions clang/lib/AST/Decl.cpp
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Expand Up @@ -1742,6 +1742,9 @@ void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
// Collect named contexts.
DeclarationName NameInScope = getDeclName();
for (; Ctx; Ctx = Ctx->getParent()) {
if (P.Callbacks && P.Callbacks->isScopeVisible(Ctx))
continue;

// Suppress anonymous namespace if requested.
if (P.SuppressUnwrittenScope && isa<NamespaceDecl>(Ctx) &&
cast<NamespaceDecl>(Ctx)->isAnonymousNamespace())
Expand Down
67 changes: 6 additions & 61 deletions clang/lib/AST/TypePrinter.cpp
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Expand Up @@ -131,8 +131,6 @@ class TypePrinter {

void printBefore(QualType T, raw_ostream &OS);
void printAfter(QualType T, raw_ostream &OS);
void AppendScope(DeclContext *DC, raw_ostream &OS,
DeclarationName NameInScope);
void printTagType(const TagType *T, raw_ostream &OS);
void printFunctionAfter(const FunctionType::ExtInfo &Info, raw_ostream &OS);
#define ABSTRACT_TYPE(CLASS, PARENT)
Expand Down Expand Up @@ -1226,7 +1224,7 @@ void TypePrinter::printTypeSpec(NamedDecl *D, raw_ostream &OS) {
// In C, this will always be empty except when the type
// being printed is anonymous within other Record.
if (!Policy.SuppressScope)
AppendScope(D->getDeclContext(), OS, D->getDeclName());
D->printNestedNameSpecifier(OS, Policy);

IdentifierInfo *II = D->getIdentifier();
OS << II->getName();
Expand All @@ -1240,7 +1238,7 @@ void TypePrinter::printUnresolvedUsingBefore(const UnresolvedUsingType *T,
OS << ' ';
auto *D = T->getDecl();
if (Policy.FullyQualifiedName || T->isCanonicalUnqualified()) {
AppendScope(D->getDeclContext(), OS, D->getDeclName());
D->printNestedNameSpecifier(OS, Policy);
} else {
T->getQualifier().print(OS, Policy);
}
Expand All @@ -1257,7 +1255,7 @@ void TypePrinter::printUsingBefore(const UsingType *T, raw_ostream &OS) {
OS << ' ';
auto *D = T->getDecl();
if (Policy.FullyQualifiedName) {
AppendScope(D->getDeclContext(), OS, D->getDeclName());
D->printNestedNameSpecifier(OS, Policy);
} else {
T->getQualifier().print(OS, Policy);
}
Expand All @@ -1273,7 +1271,7 @@ void TypePrinter::printTypedefBefore(const TypedefType *T, raw_ostream &OS) {
OS << ' ';
auto *D = T->getDecl();
if (Policy.FullyQualifiedName) {
AppendScope(D->getDeclContext(), OS, D->getDeclName());
D->printNestedNameSpecifier(OS, Policy);
} else {
T->getQualifier().print(OS, Policy);
}
Expand Down Expand Up @@ -1511,59 +1509,6 @@ void TypePrinter::printPredefinedSugarBefore(const PredefinedSugarType *T,
void TypePrinter::printPredefinedSugarAfter(const PredefinedSugarType *T,
raw_ostream &OS) {}

/// Appends the given scope to the end of a string.
void TypePrinter::AppendScope(DeclContext *DC, raw_ostream &OS,
DeclarationName NameInScope) {
if (DC->isTranslationUnit())
return;

// FIXME: Consider replacing this with NamedDecl::printNestedNameSpecifier,
// which can also print names for function and method scopes.
if (DC->isFunctionOrMethod())
return;

if (Policy.Callbacks && Policy.Callbacks->isScopeVisible(DC))
return;

if (const auto *NS = dyn_cast<NamespaceDecl>(DC)) {
if (Policy.SuppressUnwrittenScope && NS->isAnonymousNamespace())
return AppendScope(DC->getParent(), OS, NameInScope);

// Only suppress an inline namespace if the name has the same lookup
// results in the enclosing namespace.
if (Policy.SuppressInlineNamespace !=
PrintingPolicy::SuppressInlineNamespaceMode::None &&
NS->isInline() && NameInScope &&
NS->isRedundantInlineQualifierFor(NameInScope))
return AppendScope(DC->getParent(), OS, NameInScope);

AppendScope(DC->getParent(), OS, NS->getDeclName());
if (NS->getIdentifier())
OS << NS->getName() << "::";
else
OS << "(anonymous namespace)::";
} else if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
AppendScope(DC->getParent(), OS, Spec->getDeclName());
IncludeStrongLifetimeRAII Strong(Policy);
OS << Spec->getIdentifier()->getName();
const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
printTemplateArgumentList(
OS, TemplateArgs.asArray(), Policy,
Spec->getSpecializedTemplate()->getTemplateParameters());
OS << "::";
} else if (const auto *Tag = dyn_cast<TagDecl>(DC)) {
AppendScope(DC->getParent(), OS, Tag->getDeclName());
if (TypedefNameDecl *Typedef = Tag->getTypedefNameForAnonDecl())
OS << Typedef->getIdentifier()->getName() << "::";
else if (Tag->getIdentifier())
OS << Tag->getIdentifier()->getName() << "::";
else
return;
} else {
AppendScope(DC->getParent(), OS, NameInScope);
}
}

void TypePrinter::printTagType(const TagType *T, raw_ostream &OS) {
TagDecl *D = T->getDecl();

Expand Down Expand Up @@ -1593,7 +1538,7 @@ void TypePrinter::printTagType(const TagType *T, raw_ostream &OS) {
// Compute the full nested-name-specifier for this type.
// In C, this will always be empty except when the type
// being printed is anonymous within other Record.
AppendScope(D->getDeclContext(), OS, D->getDeclName());
D->printNestedNameSpecifier(OS, Policy);
}

if (const IdentifierInfo *II = D->getIdentifier())
Expand Down Expand Up @@ -1809,7 +1754,7 @@ void TypePrinter::printTemplateId(const TemplateSpecializationType *T,
// FIXME: Null TD never exercised in test suite.
if (FullyQualify && TD) {
if (!Policy.SuppressScope)
AppendScope(TD->getDeclContext(), OS, TD->getDeclName());
TD->printNestedNameSpecifier(OS, Policy);

OS << TD->getName();
} else {
Expand Down
4 changes: 2 additions & 2 deletions clang/test/ASTMerge/struct/test.c
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Expand Up @@ -44,10 +44,10 @@
// CHECK: struct2.c:72:7: note: field 'i' has type 'int' here
// CHECK: struct2.c:76:5: warning: external variable 'x13' declared with incompatible types in different translation units ('S13' vs. 'S13')
// CHECK: struct1.c:79:5: note: declared here with type 'S13'
// CHECK: struct1.c:130:7: warning: type 'struct DeepUnnamedError::(unnamed at [[PATH_TO_INPUTS:.+]]struct1.c:130:7)' has incompatible definitions in different translation units
// CHECK: struct1.c:130:7: warning: type 'struct DeepUnnamedError::(anonymous union)::(anonymous union)::(unnamed at [[PATH_TO_INPUTS:.+]]struct1.c:130:7)' has incompatible definitions in different translation units
// CHECK: struct1.c:131:14: note: field 'i' has type 'long' here
// CHECK: struct2.c:128:15: note: field 'i' has type 'float' here
// CHECK: struct1.c:129:5: warning: type 'union DeepUnnamedError::(unnamed at [[PATH_TO_INPUTS]]struct1.c:129:5)' has incompatible definitions in different translation units
// CHECK: struct1.c:129:5: warning: type 'union DeepUnnamedError::(anonymous union)::(unnamed at [[PATH_TO_INPUTS]]struct1.c:129:5)' has incompatible definitions in different translation units
// CHECK: struct1.c:132:9: note: field 'S' has type 'struct (unnamed struct at [[PATH_TO_INPUTS]]struct1.c:130:7)' here
// CHECK: struct2.c:129:9: note: field 'S' has type 'struct (unnamed struct at [[PATH_TO_INPUTS]]struct2.c:127:7)' here
// CHECK: struct2.c:138:3: warning: external variable 'x16' declared with incompatible types in different translation units ('struct DeepUnnamedError' vs. 'struct DeepUnnamedError')
Expand Down
2 changes: 1 addition & 1 deletion clang/test/CXX/drs/cwg6xx.cpp
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Expand Up @@ -1241,7 +1241,7 @@ namespace cwg686 { // cwg686: 3.0
#endif
struct N {
operator struct O{}(){};
// expected-error@-1 {{'N::O' cannot be defined in a type specifier}}
// expected-error@-1 {{'cwg686::f()::N::O' cannot be defined in a type specifier}}
};
try {}
catch (struct P *) {}
Expand Down
2 changes: 1 addition & 1 deletion clang/test/Index/print-type.c
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Expand Up @@ -71,7 +71,7 @@ _Atomic(unsigned long) aul;
// CHECK: TypeRef=struct Struct:16:8 [type=struct Struct] [typekind=Record] [isPOD=1]
// CHECK: StructDecl=struct (unnamed at {{.*}}):18:1 (Definition) [type=struct (unnamed at {{.*}}print-type.c:18:1)] [typekind=Record] [isPOD=1] [nbFields=2] [isAnon=1] [isAnonRecDecl=0]
// CHECK: StructDecl=struct (unnamed at {{.*}}):23:1 (Definition) [type=struct (unnamed at {{.*}}print-type.c:23:1)] [typekind=Record] [isPOD=1] [nbFields=1] [isAnon=1] [isAnonRecDecl=0]
// CHECK: StructDecl=struct (anonymous at {{.*}}):24:3 (Definition) [type=struct (anonymous at {{.*}}print-type.c:24:3)] [typekind=Record] [isPOD=1] [nbFields=2] [isAnon=1] [isAnonRecDecl=1]
// CHECK: StructDecl=struct (anonymous at {{.*}}):24:3 (Definition) [type=struct (anonymous struct)::(anonymous at {{.*}}print-type.c:24:3)] [typekind=Record] [isPOD=1] [nbFields=2] [isAnon=1] [isAnonRecDecl=1]
// CHECK: FieldDecl=x:25:17 (Definition) [type=_Atomic(int)] [typekind=Atomic] [valuetype=int] [valuetypekind=Int] [isPOD=0] [isAnonRecDecl=0]
// CHECK: FieldDecl=y:26:9 (Definition) [type=int] [typekind=Int] [isPOD=1] [isAnonRecDecl=0]
// CHECK: StructDecl=struct (unnamed at {{.*}}):30:10 (Definition) [type=struct (unnamed at {{.*}}print-type.c:30:10)] [typekind=Record] [isPOD=1] [nbFields=2] [isAnon=1] [isAnonRecDecl=0]
Expand Down
4 changes: 2 additions & 2 deletions clang/test/Layout/ms-x86-alias-avoidance-padding.cpp
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Expand Up @@ -49,7 +49,7 @@ struct AT3 : AT2, AT1 {
// CHECK-NEXT: 0 | struct AT2 (base)
// CHECK-NEXT: 0 | struct AT0 t
// CHECK-NEXT: 0 | union AT0::(unnamed at {{.*}} x
// CHECK-NEXT: 0 | struct AT0::(unnamed at {{.*}} y
// CHECK-NEXT: 0 | struct AT0::(anonymous union)::(unnamed at {{.*}} y
// CHECK-NEXT: 0 | int a
// CHECK-NEXT: 4 | struct AT t (empty)
// CHECK: 0 | int b
Expand All @@ -66,7 +66,7 @@ struct AT3 : AT2, AT1 {
// CHECK-X64-NEXT: 0 | struct AT2 (base)
// CHECK-X64-NEXT: 0 | struct AT0 t
// CHECK-X64-NEXT: 0 | union AT0::(unnamed at {{.*}} x
// CHECK-X64-NEXT: 0 | struct AT0::(unnamed at {{.*}} y
// CHECK-X64-NEXT: 0 | struct AT0::(anonymous union)::(unnamed at {{.*}} y
// CHECK-X64-NEXT: 0 | int a
// CHECK-X64-NEXT: 4 | struct AT t (empty)
// CHECK-X64: 0 | int b
Expand Down
3 changes: 2 additions & 1 deletion clang/test/Modules/compare-record.c
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Expand Up @@ -496,6 +496,7 @@ struct CompareAnonymousNestedStruct compareAnonymousNestedStruct;
// [email protected]:* {{declaration of 'anonymousNestedStructField' does not match}}
#elif defined(CASE3)
struct CompareDeeplyNestedAnonymousUnionsAndStructs compareDeeplyNested;
// [email protected]:* {{'CompareDeeplyNestedAnonymousUnionsAndStructs::(anonymous union)::(anonymous union)::(anonymous struct)::z' from module 'Second' is not present in definition of 'struct CompareDeeplyNestedAnonymousUnionsAndStructs::(anonymous at {{.*}})' in module 'First.Hidden'}}
// [email protected]:* {{'CompareDeeplyNestedAnonymousUnionsAndStructs::(anonymous union)::(anonymous union)::(anonymous struct)::z' from module 'Second' is not present in definition of 'struct CompareDeeplyNestedAnonymousUnionsAndStructs::(anonymous union)::(anonymous union)::(anonymous at {{.*}})' in module 'First.Hidden'}}

// [email protected]:* {{declaration of 'z' does not match}}
#endif
8 changes: 4 additions & 4 deletions clang/test/SemaObjCXX/arc-0x.mm
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Expand Up @@ -162,7 +162,7 @@ void test() {

struct S1 {
union {
union { // expected-note-re {{copy constructor of 'S1' is implicitly deleted because field 'test_union::S1::(anonymous union at {{.*}})' has a deleted copy constructor}} expected-note-re {{copy assignment operator of 'S1' is implicitly deleted because field 'test_union::S1::(anonymous union at {{.*}})' has a deleted copy assignment operator}} expected-note-re 4 {{'S1' is implicitly deleted because field 'test_union::S1::(anonymous union at {{.*}})' has a deleted}}
union { // expected-note-re {{copy constructor of 'S1' is implicitly deleted because field 'test_union::S1::(anonymous union)::(anonymous union at {{.*}})' has a deleted copy constructor}} expected-note-re {{copy assignment operator of 'S1' is implicitly deleted because field 'test_union::S1::(anonymous union)::(anonymous union at {{.*}})' has a deleted copy assignment operator}} expected-note-re 4 {{'S1' is implicitly deleted because field 'test_union::S1::(anonymous union)::(anonymous union at {{.*}})' has a deleted}}
id f0; // expected-note-re 2 {{{{.*}} of '(anonymous union at {{.*}}' is implicitly deleted because variant field 'f0' is an ObjC pointer}}
char f1;
};
Expand All @@ -173,7 +173,7 @@ void test() {
struct S2 {
union {
// FIXME: the note should say 'f0' is causing the special functions to be deleted.
struct { // expected-note-re 6 {{'S2' is implicitly deleted because variant field 'test_union::S2::(anonymous struct at {{.*}})' has a non-trivial}}
struct { // expected-note-re 6 {{'S2' is implicitly deleted because variant field 'test_union::S2::(anonymous union)::(anonymous struct at {{.*}})' has a non-trivial}}
id f0;
int f1;
};
Expand All @@ -195,8 +195,8 @@ void test() {
};

static union { // expected-error {{call to implicitly-deleted default constructor of}}
union { // expected-note-re {{default constructor of '(unnamed union at {{.*}}' is implicitly deleted because field 'test_union::(anonymous union at {{.*}})' has a deleted default constructor}}
union { // expected-note-re {{default constructor of '(anonymous union at {{.*}}' is implicitly deleted because field 'test_union::(anonymous union at {{.*}})' has a deleted default constructor}}
union { // expected-note-re {{default constructor of '(unnamed union at {{.*}}' is implicitly deleted because field 'test_union::(anonymous union)::(anonymous union at {{.*}})' has a deleted default constructor}}
union { // expected-note-re {{default constructor of '(anonymous union at {{.*}}' is implicitly deleted because field 'test_union::(anonymous union)::(anonymous union)::(anonymous union at {{.*}})' has a deleted default constructor}}
__weak id g1; // expected-note-re {{default constructor of '(anonymous union at {{.*}}' is implicitly deleted because variant field 'g1' is an ObjC pointer}}
int g2;
};
Expand Down
46 changes: 46 additions & 0 deletions clang/unittests/AST/TypePrinterTest.cpp
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Expand Up @@ -295,3 +295,49 @@ TEST(TypePrinter, TemplateArgumentsSubstitution_Expressions) {
Ctx, Arg, Param, ArgList.asArray(), Params->getDepth()));
}
}

TEST(TypePrinter, NestedNameSpecifiers) {
constexpr char Code[] = R"cpp(
void level1() {
struct Inner {
Inner(int) {
struct {
union {} u;
} imem;
}
};
}
)cpp";

// Types scoped immediately inside a function don't print the function name in
// their scope.
ASSERT_TRUE(PrintedTypeMatches(
Code, {}, varDecl(hasName("imem"), hasType(qualType().bind("id"))),
"struct (unnamed)", [](PrintingPolicy &Policy) {
Policy.FullyQualifiedName = true;
Policy.AnonymousTagLocations = false;
}));

ASSERT_TRUE(PrintedTypeMatches(
Code, {}, varDecl(hasName("imem"), hasType(qualType().bind("id"))),
"struct (unnamed)", [](PrintingPolicy &Policy) {
Policy.FullyQualifiedName = false;
Policy.AnonymousTagLocations = false;
}));

// Further levels of nesting print the entire scope.
ASSERT_TRUE(PrintedTypeMatches(
Code, {}, fieldDecl(hasName("u"), hasType(qualType().bind("id"))),
"union level1()::Inner::Inner(int)::(anonymous struct)::(unnamed)",
[](PrintingPolicy &Policy) {
Policy.FullyQualifiedName = true;
Policy.AnonymousTagLocations = false;
}));

ASSERT_TRUE(PrintedTypeMatches(
Code, {}, fieldDecl(hasName("u"), hasType(qualType().bind("id"))),
"union (unnamed)", [](PrintingPolicy &Policy) {
Policy.FullyQualifiedName = false;
Policy.AnonymousTagLocations = false;
}));
}