[clang][TypePrinter] Replace AppendScope with printNestedNameSpecifier #168534
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In debug-info we soon have the need to print names using the full scope of the entity (see discussion in llvm#159592). Particularly, when a structure is scoped inside a function, we'd like to emit the name as `func()::foo`. `CGDebugInfo` uses the `TypePrinter` to print type names into debug-info. However, `TypePrinter` stops (and ignores) `DeclContext`s that are functions. I.e., it would just print `foo`. Ideally it would behave the same way `printNestedNameSpecifier` does. The FIXME in https://github.com/llvm/llvm-project/blob/47c1aa4cef638c97b74f3afb7bed60e92bba1f90/clang/lib/AST/TypePrinter.cpp#L1520-L1521 motivated this patch. See llvm#168533 for how this will be used by `CGDebugInfo`. The plan is to introduce a new `PrintingPolicy` that prints anonymous entities using their full scope (including function/anonymous scopes) and the mangling number.
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@llvm/pr-subscribers-clang @llvm/pr-subscribers-clang-modules Author: Michael Buch (Michael137) ChangesIn debug-info we soon have the need to print names using the full scope of the entity (see discussion in #159592). Particularly, when a structure is scoped inside a function, we'd like to emit the name as llvm-project/clang/lib/AST/TypePrinter.cpp Lines 1520 to 1521 in 47c1aa4 See #168533 for how this will be used by Full diff: https://github.com/llvm/llvm-project/pull/168534.diff 8 Files Affected:
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 8579e51e45697..b771faa4581ec 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -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())
diff --git a/clang/lib/AST/TypePrinter.cpp b/clang/lib/AST/TypePrinter.cpp
index c18b2eafc722c..d2881d5ac518a 100644
--- a/clang/lib/AST/TypePrinter.cpp
+++ b/clang/lib/AST/TypePrinter.cpp
@@ -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)
@@ -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();
@@ -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);
}
@@ -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);
}
@@ -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);
}
@@ -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();
@@ -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())
@@ -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 {
diff --git a/clang/test/ASTMerge/struct/test.c b/clang/test/ASTMerge/struct/test.c
index 10ea753b142bd..d11234472ef29 100644
--- a/clang/test/ASTMerge/struct/test.c
+++ b/clang/test/ASTMerge/struct/test.c
@@ -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')
diff --git a/clang/test/CXX/drs/cwg6xx.cpp b/clang/test/CXX/drs/cwg6xx.cpp
index 11eb0bf3a27b2..8eac049211193 100644
--- a/clang/test/CXX/drs/cwg6xx.cpp
+++ b/clang/test/CXX/drs/cwg6xx.cpp
@@ -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 *) {}
diff --git a/clang/test/Index/print-type.c b/clang/test/Index/print-type.c
index d30f4bed246c5..9fb85f8da4e66 100644
--- a/clang/test/Index/print-type.c
+++ b/clang/test/Index/print-type.c
@@ -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]
diff --git a/clang/test/Layout/ms-x86-alias-avoidance-padding.cpp b/clang/test/Layout/ms-x86-alias-avoidance-padding.cpp
index 678537bb514f5..bc6a56ef37538 100644
--- a/clang/test/Layout/ms-x86-alias-avoidance-padding.cpp
+++ b/clang/test/Layout/ms-x86-alias-avoidance-padding.cpp
@@ -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
@@ -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
diff --git a/clang/test/Modules/compare-record.c b/clang/test/Modules/compare-record.c
index ef4a3a5b0e90d..97caabd55fe33 100644
--- a/clang/test/Modules/compare-record.c
+++ b/clang/test/Modules/compare-record.c
@@ -496,6 +496,7 @@ struct CompareAnonymousNestedStruct compareAnonymousNestedStruct;
// expected-note@first-anonymous.h:* {{declaration of 'anonymousNestedStructField' does not match}}
#elif defined(CASE3)
struct CompareDeeplyNestedAnonymousUnionsAndStructs compareDeeplyNested;
-// expected-error-re@second-anonymous.h:* {{'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'}}
+// expected-error-re@second-anonymous.h:* {{'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'}}
+
// expected-note@first-anonymous.h:* {{declaration of 'z' does not match}}
#endif
diff --git a/clang/test/SemaObjCXX/arc-0x.mm b/clang/test/SemaObjCXX/arc-0x.mm
index bcaa5da6b9283..a7418eceb244b 100644
--- a/clang/test/SemaObjCXX/arc-0x.mm
+++ b/clang/test/SemaObjCXX/arc-0x.mm
@@ -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;
};
@@ -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;
};
@@ -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;
};
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Thought I'd open this and see what people think of the change in diagnostics. Description explains the motivation but the TL;DR is that we want to be able to print full nested scopes in the future for debug-info purposes. We could add some logic into CC @zygoloid since you suggested the FIXME originally |
Endilll
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Nov 18, 2025
🐧 Linux x64 Test Results
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adrian-prantl
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Nov 20, 2025
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From a debug info perspective this change LGTM.
Endilll
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Unit test is not what I expected, but it works.
LGTM
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In debug-info we soon have the need to print names using the full scope of the entity (see discussion in #159592). Particularly, when a structure is scoped inside a function, we'd like to emit the name as
func()::foo.CGDebugInfouses theTypePrinterto print type names into debug-info. However,TypePrinterstops (and ignores)DeclContexts that are functions. I.e., it would just printfoo. Ideally it would behave the same wayprintNestedNameSpecifierdoes. The FIXME inllvm-project/clang/lib/AST/TypePrinter.cpp
Lines 1520 to 1521 in 47c1aa4
See #168533 for how this will be used by
CGDebugInfo. The plan is to introduce a newPrintingPolicythat prints anonymous entities using their full scope (including function/anonymous scopes) and the mangling number.