[clang] Add aliasee field to AliasAttr json AST dump

[aaron.ballman]

LGTM!

clang/include/clang/AST/JSONNodeDumper.h

void Visit(const TemplateArgument &TA, SourceRange R = {},
              const Decl *From = nullptr, StringRef Label = {});
   void Visit(const CXXCtorInitializer *Init);
   void Visit(const OMPClause *C);
   void Visit(const BlockDecl::Capture &C);
   void Visit(const GenericSelectionExpr::ConstAssociation &A);
   void Visit(const concepts::Requirement *R);
   void Visit(const APValue &Value, QualType Ty);
 
+  void VisitAliasAttr(const AliasAttr *AA);
+
   void VisitTypedefType(const TypedefType *TT);
   void VisitUsingType(const UsingType *TT);
   void VisitFunctionType(const FunctionType *T);
   void VisitFunctionProtoType(const FunctionProtoType *T);
   void VisitRValueReferenceType(const ReferenceType *RT);
   void VisitArrayType(const ArrayType *AT);
   void VisitConstantArrayType(const ConstantArrayType *CAT);
   void VisitDependentSizedExtVectorType(const DependentSizedExtVectorType *VT);

clang/lib/AST/JSONNodeDumper.cpp

JSONNodeDumper::createCXXBaseSpecifier(const CXXBaseSpecifier &BS) {
   if (BS.isVirtual())
     Ret["isVirtual"] = true;
   if (BS.isPackExpansion())
     Ret["isPackExpansion"] = true;
 
   return Ret;
 }
 
+void JSONNodeDumper::VisitAliasAttr(const AliasAttr *AA) {
+  JOS.attribute("aliasee", AA->getAliasee());
+}
+
 void JSONNodeDumper::VisitTypedefType(const TypedefType *TT) {
   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
   if (!TT->typeMatchesDecl())
     JOS.attribute("type", createQualType(TT->desugar()));
 }
 
 void JSONNodeDumper::VisitUsingType(const UsingType *TT) {
   JOS.attribute("decl", createBareDeclRef(TT->getFoundDecl()));

clang/test/AST/ast-dump-attr-json.cpp

+// RUN: %clang_cc1 -Wdocumentation -ast-dump=json %s | FileCheck %s
+
+int global_decl;
+extern __attribute__((alias("global_decl"))) int global_alias;
+
+// NOTE: CHECK lines have been autogenerated by gen_ast_dump_json_test.py
+// using --filters=VarDecl
+
+
+// CHECK-NOT: {{^}}Dumping
+// CHECK:  "kind": "VarDecl",
+// CHECK-NEXT:  "loc": {
+// CHECK-NEXT:   "offset": 73,
+// CHECK-NEXT:   "file": "{{.*}}",
+// CHECK-NEXT:   "line": 3,
+// CHECK-NEXT:   "col": 5,
+// CHECK-NEXT:   "tokLen": 11
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "range": {
+// CHECK-NEXT:   "begin": {
+// CHECK-NEXT:    "offset": 69,
+// CHECK-NEXT:    "col": 1,
+// CHECK-NEXT:    "tokLen": 3
+// CHECK-NEXT:   },
+// CHECK-NEXT:   "end": {
+// CHECK-NEXT:    "offset": 73,
+// CHECK-NEXT:    "col": 5,
+// CHECK-NEXT:    "tokLen": 11
+// CHECK-NEXT:   }
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "name": "global_decl",
+// CHECK-NEXT:  "mangledName": "global_decl",
+// CHECK-NEXT:  "type": {
+// CHECK-NEXT:   "qualType": "int"
+// CHECK-NEXT:  }
+// CHECK-NEXT: }
+
+
+// CHECK-NOT: {{^}}Dumping
+// CHECK:  "kind": "VarDecl",
+// CHECK-NEXT:  "loc": {
+// CHECK-NEXT:   "offset": 135,
+// CHECK-NEXT:   "line": 4,
+// CHECK-NEXT:   "col": 50,
+// CHECK-NEXT:   "tokLen": 12
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "range": {
+// CHECK-NEXT:   "begin": {
+// CHECK-NEXT:    "offset": 86,
+// CHECK-NEXT:    "col": 1,
+// CHECK-NEXT:    "tokLen": 6
+// CHECK-NEXT:   },
+// CHECK-NEXT:   "end": {
+// CHECK-NEXT:    "offset": 135,
+// CHECK-NEXT:    "col": 50,
+// CHECK-NEXT:    "tokLen": 12
+// CHECK-NEXT:   }
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "name": "global_alias",
+// CHECK-NEXT:  "mangledName": "global_alias",
+// CHECK-NEXT:  "type": {
+// CHECK-NEXT:   "qualType": "int"
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "storageClass": "extern",
+// CHECK-NEXT:  "inner": [
+// CHECK-NEXT:   {
+// CHECK-NEXT:    "id": "0x{{.*}}",
+// CHECK-NEXT:    "kind": "AliasAttr",
+// CHECK-NEXT:    "range": {
+// CHECK-NEXT:     "begin": {
+// CHECK-NEXT:      "offset": 108,
+// CHECK-NEXT:      "col": 23,
+// CHECK-NEXT:      "tokLen": 5
+// CHECK-NEXT:     },
+// CHECK-NEXT:     "end": {
+// CHECK-NEXT:      "offset": 127,
+// CHECK-NEXT:      "col": 42,
+// CHECK-NEXT:      "tokLen": 1
+// CHECK-NEXT:     }
+// CHECK-NEXT:    },
+// CHECK-NEXT:    "decl": "global_decl"
+// CHECK-NEXT:   }
+// CHECK-NEXT:  ]
+// CHECK-NEXT: }