如何在Clang中以字符串形式获取函数定义/签名? [英] How to get function definition/signature as a string in Clang?

问题描述

假设我拥有CXCursor左右，如何使用Clang/Libclang作为字符串获取函数的签名(或至少是整个定义?)?

我认为可以通过使用游标的范围来以某种方式获得定义，但是我真的不知道如何使用(使用什么函数).

解决方案

您可以使用此简单代码获取函数的原型(名称，返回类型，参数数量和arguments [name，data type]).

 string Convert(const CXString& s)
{
    string result = clang_getCString(s);
    clang_disposeString(s);
    return result;
}
void print_function_prototype(CXCursor cursor)
{
    // TODO : Print data! 
    auto type = clang_getCursorType(cursor);


    auto function_name = Convert(clang_getCursorSpelling(cursor));
    auto return_type   = Convert(clang_getTypeSpelling(clang_getResultType(type)));

    int num_args = clang_Cursor_getNumArguments(cursor);
    for (int i = 0; i < num_args; ++i)
    {
        auto arg_cursor = clang_Cursor_getArgument(cursor, i);
        auto arg_name = Convert(clang_getCursorSpelling(arg_cursor));
        if (arg_name.empty())
        {
            arg_name = "no name!";
        }

        auto arg_data_type = Convert(clang_getTypeSpelling(clang_getArgType(type, i)));
    }
}
CXChildVisitResult functionVisitor(CXCursor cursor, CXCursor /* parent */, CXClientData /* clientData */)
{
    if (clang_Location_isFromMainFile(clang_getCursorLocation(cursor)) == 0)
        return CXChildVisit_Continue;

    CXCursorKind kind = clang_getCursorKind(cursor);
    if ((kind == CXCursorKind::CXCursor_FunctionDecl || kind == CXCursorKind::CXCursor_CXXMethod || kind == CXCursorKind::CXCursor_FunctionTemplate || \
         kind == CXCursorKind::CXCursor_Constructor))
    {
        print_function_prototype(cursor);
    }

    return CXChildVisit_Continue;
}

How can I get a function's signature (or at least the entire definition?) as a string using Clang/Libclang, assuming I have its CXCursor or so?

I think that the definition may be somehow obtainable by using the cursor's extents, but I don't really know how (what function to use).

解决方案

You can use this simple code to get prototype of a function ( name, return type, count of arguments and arguments[name,data type]).

 string Convert(const CXString& s)
{
    string result = clang_getCString(s);
    clang_disposeString(s);
    return result;
}
void print_function_prototype(CXCursor cursor)
{
    // TODO : Print data! 
    auto type = clang_getCursorType(cursor);


    auto function_name = Convert(clang_getCursorSpelling(cursor));
    auto return_type   = Convert(clang_getTypeSpelling(clang_getResultType(type)));

    int num_args = clang_Cursor_getNumArguments(cursor);
    for (int i = 0; i < num_args; ++i)
    {
        auto arg_cursor = clang_Cursor_getArgument(cursor, i);
        auto arg_name = Convert(clang_getCursorSpelling(arg_cursor));
        if (arg_name.empty())
        {
            arg_name = "no name!";
        }

        auto arg_data_type = Convert(clang_getTypeSpelling(clang_getArgType(type, i)));
    }
}
CXChildVisitResult functionVisitor(CXCursor cursor, CXCursor /* parent */, CXClientData /* clientData */)
{
    if (clang_Location_isFromMainFile(clang_getCursorLocation(cursor)) == 0)
        return CXChildVisit_Continue;

    CXCursorKind kind = clang_getCursorKind(cursor);
    if ((kind == CXCursorKind::CXCursor_FunctionDecl || kind == CXCursorKind::CXCursor_CXXMethod || kind == CXCursorKind::CXCursor_FunctionTemplate || \
         kind == CXCursorKind::CXCursor_Constructor))
    {
        print_function_prototype(cursor);
    }

    return CXChildVisit_Continue;
}

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