Edit File: api.cpython-36.pyc
3 '+e� � @ s� d dl Z d dlZddlmZ ddlmZ ddlmZ ye W n( e k rd d dl m Z dd� ZY nX ye W n e k r� e Z Y nX G d d � d e�Zd d � Zd d� Zdd� ZdS )� N� )� allocate_lock)� CDefError)�model)�Callablec C s t | t�S )N)� isinstancer )�x� r �/usr/lib64/python3.6/api.py�<lambda> s r c @ s� e Zd ZdZdfdd�Zdgdd�Zdhdd �Zdid d �Zdjd d�Zdd� Z dd� Z dkdd�Z dd� Z dd� Z dd� Zdd � Zdld d �Zdmd d!�Zd"d#� Zdod%d&�Zd'd(� Zdpd)d*�Zd+d,� Zdqd-d.�Zdrd0d1�Zdsd2d3�Zd4d5� Zdtd6d7�Zd8d9� Z d:d;� Z e e e dd<�Z dvd=d>�Z d?d@� Z!dAdB� Z"dCdD� Z#dEdF� Z$dGdH� Z%dIdJ� Z&dKdL� Z'dMdN� Z(dOdP� Z)dwdRdS�Z*dxdUdV�Z+dWdX� Z,dYdZ� Z-dyd\d]�Z.d^d_� Z/d`da� Z0dbdc� Z1ddde� Z2dS )z�FFIa� The main top-level class that you instantiate once, or once per module. Example usage: ffi = FFI() ffi.cdef(""" int printf(const char *, ...); """) C = ffi.dlopen(None) # standard library -or- C = ffi.verify() # use a C compiler: verify the decl above is right C.printf("hello, %s!\n", ffi.new("char[]", "world")) Nc C s� |dkr^ddl }ddlm} |j|kr^t|d�rJtd|t|j|jf ��ntd|t|jf ��ddlm} || _t� | _ |j � | _ i | _ t jd �j| _t jd �j| _g | _g | _g | _g | _d| _i | _d| _d| _tj|�| _ t|d �r�|j | � x2t |j�D ]$}|j d ��r t | |t!||�� �q W | j �" | j"tj#�| _$| j"tj%�| _&W dQ R X t'|t j��r�tt(d ��s�| j)| j$d�t(_*|j+� \t(_,t(_-n | j)| j$d�| _*|j+� \| _,| _-|j.| _.dS )z{Create an FFI instance. The 'backend' argument is used to select a non-default backend, mostly for tests. Nr r )� __version__�__file__z�Version mismatch: this is the 'cffi' package version %s, located in %r. When we import the top-level '_cffi_backend' extension module, we get version %s, located in %r. 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The functions and global variables can then be accessed via either 'ffi.dlopen()' or 'ffi.verify()'. The types can be used in 'ffi.new()' and other functions. If 'packed' is specified as True, all structs declared inside this cdef are packed, i.e. laid out without any field alignment at all. )�override�packedN)�_cdef)r/ �csourcer3 r4 r r r �cdefc s zFFI.cdefc C s$ | j ||dd� | jd kr d| _d S )NT)r4 Z dllexportr )r5 r$ )r/ r6 r4 r r r � embedding_apim s zFFI.embedding_apic K s� t |t�s&t |t�s td��|jd�}| j�| t� | _| jj |fd|i|�� | j j |� |rvx| j D ] }|j � qfW | jj}|r�g | j_x|D ]}|j| |� q�W W d Q R X d S )Nz cdef() argument must be a string�asciir3 )r �str� basestring� TypeError�encoder �objectr# r �parser �appendr �clearZ _recomplete�finish_backend_type)r/ r6 r3 Zoptions�cache� finishlist�tpr r r r5 r s z FFI._cdefr c C sT t |t�s|dkst�| j�. t| ||�\}}| jj|� | jj|� W dQ R X |S )aH Load and return a dynamic library identified by 'name'. The standard C library can be loaded by passing None. 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N�_cffi_base_type)r r; rV r- r �typeofr �BuiltinFunctionType�_builtin_function_type� FunctionTyper r r) rW r< rK )r/ rN �resr r r rX � s z FFI.typeofc C s0 t |t�r | j|�}| jj|�S | jj|�S dS )zvReturn the size in bytes of the argument. It can be a string naming a C type, or a 'cdata' instance. N)r r; rV r �sizeof)r/ rN �BTyper r r r] � s z FFI.sizeofc C s t |t�r| j|�}| jj|�S )z\Return the natural alignment size in bytes of the C type given as a string. )r r; rV r �alignof)r/ rN r r r r_ � s z FFI.alignofc G s( t |t�r| j|�}| j|f|�� d S )a3 Return the offset of the named field inside the given structure or array, which must be given as a C type name. You can give several field names in case of nested structures. 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In other words the returned <cdata> object has ownership of the value of type 'cdecl' that it points to. This means that the raw data can be used as long as this object is kept alive, but must not be used for a longer time. Be careful about that when copying the pointer to the memory somewhere else, e.g. into another structure. )r r; rV r Znewp)r/ rN �initr r r �new� s zFFI.newTc s, �j j� }|j|||�� d� �fdd� }|S )a� Return a new allocator, i.e. a function that behaves like ffi.new() but uses the provided low-level 'alloc' and 'free' functions. 'alloc' is called with the size as argument. If it returns NULL, a MemoryError is raised. 'free' is called with the result of 'alloc' as argument. Both can be either Python function or directly C functions. If 'free' is None, then no free function is called. If both 'alloc' and 'free' are None, the default is used. If 'should_clear_after_alloc' is set to False, then the memory returned by 'alloc' is assumed to be already cleared (or you are fine with garbage); otherwise CFFI will clear it. Nc s t | t�r�j| �} � | |�S )N)r r; rV )rN rc )� allocatorr/ r r �allocate s z#FFI.new_allocator.<locals>.allocate)N)r r � new_allocator)r/ ZallocZfreeZshould_clear_after_allocZ compiled_ffirf r )re r/ r rg s zFFI.new_allocatorc C s" t |t�r| j|�}| jj||�S )z�Similar to a C cast: returns an instance of the named C type initialized with the given 'source'. The source is casted between integers or pointers of any type. )r r; rV r r, )r/ rN �sourcer r r r, s zFFI.castr c C s | j j||�S )a� Return a Python string (or unicode string) from the 'cdata'. If 'cdata' is a pointer or array of characters or bytes, returns the null-terminated string. The returned string extends until the first null character, or at most 'maxlen' characters. If 'cdata' is an array then 'maxlen' defaults to its length. 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Unlike other methods, this one supports all Python buffer including byte strings and bytearrays---but it still does not support non-contiguous buffers. )r �memmove)r/ �dest�src�nr r r rn ` s z FFI.memmovec sB � ���fdd�}t � t�r*�j� dd�� |dkr6|S ||�S dS )a� Return a callback object or a decorator making such a callback object. 'cdecl' must name a C function pointer type. The callback invokes the specified 'python_callable' (which may be provided either directly or via a decorator). Important: the callback object must be manually kept alive for as long as the callback may be invoked from the C level. c s" t | �std���jj� | ���S )Nz.the 'python_callable' argument is not callable)�callabler< r �callback)�python_callable)rN �error�onerrorr/ r r �callback_decorator_wrapx s z-FFI.callback.<locals>.callback_decorator_wrapT)rU N)r r; rV )r/ rN rt ru rv rw r )rN ru rv r/ r rs p s z FFI.callbackr c C sh t |t�r| j|�}|j� }|jd�rBd| jj|d�krBd| }n|rZ|d dkrZd| }| jj||�S )a. 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It tells the GC that the returned object keeps alive roughly 'size' bytes of external memory. )r Zgcp)r/ rj Z destructor�sizer r r �gc� s zFFI.gcc C sf | j jd�dkst�y| j| }W n> tk r` g }|j| |�}x|D ]}|j| |� qHW Y nX |S )NF)r �acquirerF r rT Zget_cached_btyperB )r/ rK r^ rD r r r r) � s zFFI._get_cached_btypec K sV ddl m}m} | jr | j|� |p(|� }|| ||f|�| _ | j j� }| jj|� |S )a� Verify that the current ffi signatures compile on this machine, and return a dynamic library object. The dynamic library can be used to call functions and access global variables declared in this 'ffi'. The library is compiled by the C compiler: it gives you C-level API compatibility (including calling macros). This is unlike 'ffi.dlopen()', which requires binary compatibility in the signatures. r )�Verifier�_caller_dir_pycache)�verifierr� r� r! �_apply_windows_unicode� load_libraryr r@ )r/ rh �tmpdir�kwargsr� r� rI r r r �verify� s z FFI.verifyc C s | j j� S )N)r Z get_errno)r/ r r r � _get_errno� s zFFI._get_errnoc C s | j j|� d S )N)r Z set_errno)r/ �errnor r r � _set_errno� s zFFI._set_errnoz(the value of 'errno' from/to the C callsc C s | j j|�S )N)r � getwinerror)r/ �coder r r r� � s zFFI.getwinerrorc C s | j � tj| |�S Q R X d S )N)r r � pointer_cache)r/ �ctyper r r � _pointer_to� s zFFI._pointer_toc G s� y| j j|�}W n8 tk rH dt|�jkrBt|�j|f|�� S � Y nX |rd| j|f|�� \}}n|jdkrvtd��d}| j|�}| j j |||�S )z�Return the address of a <cdata 'struct-or-union'>. 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