您好我正在尝试实现AST Clang访客,这是我的代码。
class ExampleVisitor : public RecursiveASTVisitor<ExampleVisitor> {
private:
ASTContext *astContext; // used for getting additional AST info
public:
virtual bool VisitVarDecl(VarDecl *var)
{
numVariables++;
string varName = var->getQualifiedNameAsString();
string varType = var->getType().getAsString();
cout << "Found variable declaration: " << varName << " of type " << varType << "\n";
APIs << varType << ", ";
return true;
}
virtual bool VisitFunctionDecl(FunctionDecl *func)
{
numFunctions++;
string funcName = func->getNameInfo().getName().getAsString();
string funcType = func->getResultType().getAsString();
cout << "Found function declaration: " << funcName << " of type " << funcType << "\n";
APIs << "\n\n" << funcName <<": ";
APIs << funcType << ", ";
return true;
}
virtual bool VisitStmt(Stmt *st)
{
if (CallExpr *call = dyn_cast<CallExpr>(st))
{
numFuncCalls++;
FunctionDecl *func_decl = call->getDirectCallee();
string funcCall = func_decl->getNameInfo().getName().getAsString();
cout << "Found function call: " << funcCall << " with arguments ";
APIs << funcCall << ", ";
for(int i=0, j = call->getNumArgs(); i<j; i++)
{
string TypeS;
raw_string_ostream s(TypeS);
call->getArg(i)->printPretty(s, 0, Policy);
cout<< s.str() << ", ";
APIs<< s.str() << ", ";
}
cout << "\n";
}
return true;
}
};
如何避免遍历包含的头文件,但不会丢失其信息。我只是不想打印有关此文件的任何信息,但我希望clang知道这些文件
谢谢
答案 0 :(得分:4)
通过使用AST上下文,您可以获取要解析的代码的所有nescecarry信息。区分主文件中的AST节点或头文件的函数称为isInMainFile(),可以按如下方式使用。
bool VisitVarDecl(VarDecl *var)
{
if (astContext->getSourceManager().isInMainFile(var->getLocStart())) //checks if the node is in the main = input file.
{
if(var->hasLocalStorage() || var->isStaticLocal())
{
//var->dump(); //prints the corresponding line of the AST.
FullSourceLoc FullLocation = astContext->getFullLoc(var->getLocStart());
numVariables++;
string varName = var->getQualifiedNameAsString();
string varType = var->getType().getAsString();
REPORT << "Variable Declaration [" << FullLocation.getSpellingLineNumber() << "," << FullLocation.getSpellingColumnNumber() << "]: " << varName << " of type " << varType << "\n";
APIs << varType << ",";
}
}
return true;
}
有关如何使用astContext的更多信息,请参阅clang网站上的官方递归ASTvisitor教程。