нужно найти Глобальные Переменные в .срр файле

#include <iostream>
 
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Host.h"
 
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
 
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/FileSystemOptions.h"
 
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Basic/FileManager.h"
 
#include "clang/Basic/TargetOptions.h"
#include "clang/Basic/TargetInfo.h"
 
#include "clang/Lex/Preprocessor.h"
#include "clang/Frontend/CompilerInstance.h"
 
int main()
{
    clang::DiagnosticOptions diagnosticOptions;
    clang::TextDiagnosticPrinter *pTextDiagnosticPrinter = new clang::TextDiagnosticPrinter( llvm::outs(), &diagnosticOptions );
 
    llvm::IntrusiveRefCntPtr <clang::DiagnosticIDs> pDiagIDs;
    clang::DiagnosticsEngine *pDiagnosticsEngine = new clang::DiagnosticsEngine( pDiagIDs, &diagnosticOptions, pTextDiagnosticPrinter );
 
    clang::FileSystemOptions fileSystemOptions;
    clang::FileManager fileManager( fileSystemOptions );
    clang::SourceManager sourceManager( *pDiagnosticsEngine, fileManager );
 
    clang::TargetOptions targetOptions;
    targetOptions.Triple = llvm::sys::getDefaultTargetTriple();
 
    clang::TargetInfo *pTargetInfo = clang::TargetInfo::CreateTargetInfo( *pDiagnosticsEngine, &targetOptions );
 
    llvm::IntrusiveRefCntPtr <clang::HeaderSearchOptions> hso;
 
    clang::LangOptions languageOptions;
    clang::HeaderSearch headerSearch( hso, fileManager, *pDiagnosticsEngine, languageOptions, pTargetInfo );
 
    llvm::IntrusiveRefCntPtr <clang::PreprocessorOptions> pOpts;
    clang::CompilerInstance compInst;
    clang::Preprocessor preprocessor( pOpts, *pDiagnosticsEngine, languageOptions, pTargetInfo, sourceManager, headerSearch, compInst );
 
    //const clang::FileEntry *pFile = fileManager.getFile( "test.c" );
    sourceManager.createMainFileID( fileManager.getFile( "test.c" ) /*pFile*/ );
    preprocessor.EnterMainSourceFile();
    pTextDiagnosticPrinter->BeginSourceFile( languageOptions, &preprocessor );
 
    clang::Token token;
    do {
        preprocessor.Lex( token );
        if ( pDiagnosticsEngine->hasErrorOccurred() ) break;
        preprocessor.DumpToken( token );
        std::cerr << std::endl;
    } while ( token.isNot( clang::tok::eof ) );
 
    pTextDiagnosticPrinter->EndSourceFile();
    return 0;
}

int g_a = 100;
 
int main()
{
    int l_a = 200;
    return 0;
}