直接从头文件生成的clang AST中缺少信息

clang -Xclang -ast-dump myfile.cpp

#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendAction.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"

using namespace clang;
using namespace clang::tooling;

class MyASTVisitor : public RecursiveASTVisitor<MyASTVisitor> {
public:
  bool VisitStmt(Stmt *s) {
    s->dump();
    return true;
  }
};

class MyASTConsumer : public ASTConsumer {
public:
  void HandleTranslationUnit(ASTContext &Context) override {
    Visitor.TraverseDecl(Context.getTranslationUnitDecl());
  }

private:
  MyASTVisitor Visitor;
};

class MyFrontendAction : public ASTFrontendAction {
public:
  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI, StringRef file) override {
    return std::make_unique<MyASTConsumer>();
  }
};

int main(int argc, const char **argv) {
  CommonOptionsParser OptionsParser(argc, argv, MyToolCategory);
  ClangTool Tool(OptionsParser.getCompilations(), OptionsParser.getSourcePathList());
  return Tool.run(newFrontendActionFactory<MyFrontendAction>().get());
}