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namelut.cpython-39.pyc
a �#�_� � @ s| d dl Z d dlZd dlmZ ddlmZ ddlmZ d dlmZ d dl Z ddl m Z m Z m Z e�dd �ZG d d � d e�ZdS ) � N)� OrderedDict� )� struct_parse)�Mapping)� bisect_right)�CString�Struct�If� NameLUTEntryzcu_ofs die_ofsc @ sb e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z ddd�Z dd� Z dd� Z dS )�NameLUTaO A "Name LUT" holds any of the tables specified by .debug_pubtypes or .debug_pubnames sections. This is basically a dictionary where the key is the symbol name (either a public variable, function or a type), and the value is the tuple (cu_offset, die_offset) corresponding to the variable. The die_offset is an absolute offset (meaning, it can be used to search the CU by iterating until a match is obtained). An ordered dictionary is used to preserve the CU order (i.e, items are stored on a per-CU basis (as it was originally in the .debug_* section). Usage: The NameLUT walks and talks like a dictionary and hence it can be used as such. Some examples below: # get the pubnames (a NameLUT from DWARF info). pubnames = dwarf_info.get_pubnames() # lookup a variable. entry1 = pubnames["var_name1"] entry2 = pubnames.get("var_name2", default=<default_var>) print(entry2.cu_ofs) ... # iterate over items. for (name, entry) in pubnames.items(): # do stuff with name, entry.cu_ofs, entry.die_ofs # iterate over items on a per-CU basis. import itertools for cu_ofs, item_list in itertools.groupby(pubnames.items(), key = lambda x: x[1].cu_ofs): # items are now grouped by cu_ofs. # item_list is an iterator yeilding NameLUTEntry'ies belonging # to cu_ofs. # We can parse the CU at cu_offset and use the parsed CU results # to parse the pubname DIEs in the CU listed by item_list. for item in item_list: # work with item which is part of the CU with cu_ofs. c C s" || _ || _|| _d | _d | _d S )N)�_stream�_size�_structs�_entries� _cu_headers)�self�stream�sizeZstructs� r �:/usr/lib/python3.9/site-packages/elftools/dwarf/namelut.py�__init__@ s zNameLUT.__init__c C s | j du r| �� \| _ | _| j S )a� Returns the parsed NameLUT entries. The returned object is a dictionary with the symbol name as the key and NameLUTEntry(cu_ofs, die_ofs) as the value. This is useful when dealing with very large ELF files with millions of entries. The returned entries can be pickled to a file and restored by calling set_entries on subsequent loads. N)r � _get_entriesr �r r r r � get_entriesJ s zNameLUT.get_entriesc C s || _ || _dS )a� Set the NameLUT entries from an external source. The input is a dictionary with the symbol name as the key and NameLUTEntry(cu_ofs, die_ofs) as the value. This option is useful when dealing with very large ELF files with millions of entries. The entries can be parsed once and pickled to a file and can be restored via this function on subsequent loads. N)r r )r �entries� cu_headersr r r � set_entriesX s zNameLUT.set_entriesc C s$ | j du r| �� \| _ | _t| j �S )z? Returns the number of entries in the NameLUT. N)r r r �lenr r r r �__len__e s zNameLUT.__len__c C s& | j du r| �� \| _ | _| j �|�S )z{ Returns a namedtuple - NameLUTEntry(cu_ofs, die_ofs) - that corresponds to the given symbol name. N�r r r �get)r �namer r r � __getitem__m s zNameLUT.__getitem__c C s$ | j du r| �� \| _ | _t| j �S )z@ Returns an iterator to the NameLUT dictionary. N)r r r �iterr r r r �__iter__v s zNameLUT.__iter__c C s$ | j du r| �� \| _ | _| j �� S )z7 Returns the NameLUT dictionary items. N)r r r �itemsr r r r r% ~ s z NameLUT.itemsNc C s( | j du r| �� \| _ | _| j �||�S )z� Returns NameLUTEntry(cu_ofs, die_ofs) for the provided symbol name or None if the symbol does not exist in the corresponding section. Nr )r r! �defaultr r r r � s z NameLUT.getc C s | j du r| �� \| _| _ | j S )zF Returns all CU headers. Mainly required for readelf. N)r r r r r r r �get_cu_headers� s zNameLUT.get_cu_headersc C s� | j �d� t� }g }d}td| j�d�tdd� td���}|| jk r�t | jj | j |�}|� |� ||j | j� � }|j}t || j �}|jdkr�q<t|||j d�||j�d�< q|q<||fS ) zt Parse the (name, cu_ofs, die_ofs) information from this section and store as a dictionary. r ZDwarf_offset_name_pair�die_ofsc S s | d S )Nr( r )�ctxr r r �<lambda>� � z&NameLUT._get_entries.<locals>.<lambda>r! )Zcu_ofsr( zutf-8)r �seekr r r Z Dwarf_offsetr r r r ZDwarf_nameLUT_header�appendZ unit_lengthZinitial_length_field_sizeZdebug_info_offsetr( r r! �decode)r r r �offsetZ entry_structZ namelut_hdrZ hdr_cu_ofs�entryr r r r � s2 � � � �zNameLUT._get_entries)N)�__name__� __module__� __qualname__�__doc__r r r r r" r$ r% r r' r r r r r r s + r )�os� collectionsr Z common.utilsr Zcommon.py3compatr Zbisectr ZmathZ constructr r r � namedtupler r r r r r �<module> s
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