[clang] [ASTDump] Add support for structural value template arguments in TextNodeDumper

clang/docs/ReleaseNotes.rst

@@ -54,6 +54,8 @@ ABI Changes in This Version
 AST Dumping Potentially Breaking Changes
 ----------------------------------------
 
+- Added support for dumping structural value template arguments in AST dumps. (#GH126341)
+
 Clang Frontend Potentially Breaking Changes
 -------------------------------------------
 

clang/include/clang/AST/TextNodeDumper.h

@@ -249,6 +249,7 @@ class TextNodeDumper
   void VisitDeclarationTemplateArgument(const TemplateArgument &TA);
   void VisitNullPtrTemplateArgument(const TemplateArgument &TA);
   void VisitIntegralTemplateArgument(const TemplateArgument &TA);
+  void VisitStructuralValueTemplateArgument(const TemplateArgument &TA);
   void VisitTemplateTemplateArgument(const TemplateArgument &TA);
   void VisitTemplateExpansionTemplateArgument(const TemplateArgument &TA);
   void VisitExpressionTemplateArgument(const TemplateArgument &TA);

clang/lib/AST/TextNodeDumper.cpp

@@ -1226,6 +1226,12 @@ void TextNodeDumper::VisitIntegralTemplateArgument(const TemplateArgument &TA) {
   dumpTemplateArgument(TA);
 }
 
+void TextNodeDumper::VisitStructuralValueTemplateArgument(
+    const TemplateArgument &TA) {
+  OS << " structural value";
+  dumpTemplateArgument(TA);
+}
+
 void TextNodeDumper::dumpTemplateName(TemplateName TN, StringRef Label) {
   AddChild(Label, [=] {
     {

clang/test/AST/ast-dump-template-argument-structural-value.cpp

@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -std=c++20 -ast-dump -ast-dump-filter=pr126341 %s | FileCheck %s
+
+template<_Complex int x>
+struct pr126341;
+template<>
+struct pr126341<{1, 2}>;
+
+// CHECK: Dumping pr126341:
+// CHECK-NEXT: ClassTemplateDecl
+// CHECK: Dumping pr126341:
+// CHECK-NEXT: ClassTemplateSpecializationDecl
+// CHECK-NEXT: `-TemplateArgument structural value '1+2i'