#include <clang/Basic/Diagnostic.h>
#include <clang/Frontend/CompilerInstance.h>
#include <clang/Frontend/CompilerInvocation.h>
#include <clang/Frontend/TextDiagnosticPrinter.h>

int main() {
  // 创建编译器实例
  clang::CompilerInstance compiler;

  // 设置编译参数
  CompilerInvocation invocation;
  invocation.setLangOpts(clang::LangOptions());
  invocation.setCodeGenOpts(codegenoptions);

  // 创建编译器诊断打印程序
  clang::TextDiagnosticPrinter diags;
  compiler.createDiagnostics(&diags);

  // 将源代码加载到编译器中
  const char* src = "int sum(int a, int b) { return a   b; }";
  std::unique_ptr<clang::CompilerInvocation> invocation(new CompilerInvocation);
  invocation->setLangOpts(LangOpts());
  invocation->getFrontendOpts().Inputs.clear();
  invocation->getFrontendOpts().Inputs.push_back(make_unique<clang::FrontendInputFile>(src, nullptr));

  // 编译代码
  if (compiler.ExecuteAction(invocation->createFrontendAction(), diagnosticOptions)) {
    return 1;
  }

  // 函数指针获取编译后的功能指针
  void* jittedCode = compiler.getCodeGenerator().GetLazyCompiledFunction();

  // 调用编译函数
  int a = 10;
  int b = 20;
  int result = ((int (*)(int, int))jittedCode)(a, b);

  return 0;
}