如何解析C ++代码中的宏，使用CLANG作为解析器和Python作为脚本语言？ [英] How can I parse macros in C++ code, using CLANG as the parser and Python as the scripting language?

问题描述

如果我在一些C ++代码中有以下宏：

If I have the following macro in some C++ code:

_Foo(arg1, arg2)

我想使用Python使用Clang和cindex提供的Python绑定来查找该宏的所有实例和范围。 py。我不想直接使用Python中的正则表达式，因为这会得到我的99％，但不是100％。在我看来，要达到100％，你需要使用一个真正的C ++解析器，如Clang处理所有的情况下，人们做愚蠢的事情，语法正确和编译，但对正则表达式没有意义。我需要处理100％的情况，因为我们使用Clang作为我们的编译器之一，所以使用它作为这个任务的解析器也是有意义的。

I would like to use Python to find me all the instances and extents of that macro using Clang and the Python bindings provided with cindex.py. I do not want to use a regular expression from Python on the code directly because that gets me 99% of the way there, but not 100%. It appears to me that to get to 100%, you need to use a real C++ parser like Clang to handle all the cases where people do silly things that are syntactically correct and compile, but don't make sense to a regular expression. I need to handle 100% of the cases and since we use Clang as one of our compilers, it makes sense to use it as the parser for this task as well.

给定下面的Python代码，我可以找到看起来像Clang python绑定知道的预定义类型，但不是宏：

Given the following Python code I am able to find what appear to be predefined types that the Clang python bindings know about, but not macros:

def find_typerefs(node):
    ref_node = clang.cindex.Cursor_ref(node)
    if ref_node:
        print 'Found %s Type %s DATA %s Extent %s [line=%s, col=%s]' % (
            ref_node.spelling, ref_node.kind, node.data, node.extent, node.location.line, node.location.column)

# Recurse for children of this node
for c in node.get_children():
    find_typerefs(c)

index = clang.cindex.Index.create()
tu = index.parse(sys.argv[1])
find_typerefs(tu.cursor)

$ b b

我认为我正在寻找的是一种解析原始的AST为我的宏 _FOO（）的名称的方法，但我不知道。有人可以提供一些代码，这将允许我传递一个宏的名称，并从Clang获取范围或数据？

What I think I am looking for is a way to parse the raw AST for the name of my macro _FOO(), but I am not sure. Can someone provide some code that will allow me to pass in the name of a Macro and get back the extent or data from Clang?

推荐答案

您需要将相应的选项标记传递给 Index.parse ：

You need to pass the appropriate options flag to Index.parse:

tu = index.parse(sys.argv[1], options=clang.cindex.TranslationUnit.PARSE_DETAILED_PROCESSING_RECORD)

光标访问者的其余部分可能如下所示：

The rest of the cursor visitor could look like this:

def visit(node):
    if node.kind in (clang.cindex.CursorKind.MACRO_INSTANTIATION, clang.cindex.CursorKind.MACRO_DEFINITION):
        print 'Found %s Type %s DATA %s Extent %s [line=%s, col=%s]' % (node.displayname, node.kind, node.data, node.extent, node.location.line, node.location.column)
    for c in node.get_children():
        visit(c)

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