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Edit: 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$d�| _*|j+� \| _,| _-|j.| _.dS )z{Create an FFI instance. The 'backend' argument is used to select a non-default backend, mostly for tests. Nr r )� __version__�__file__z�Version mismatch: this is the 'cffi' package version %s, located in %r. When we import the top-level '_cffi_backend' extension module, we get version %s, located in %r. The two versions should be equal; check your installation.z�Version mismatch: this is the 'cffi' package version %s, located in %r. This interpreter comes with a built-in '_cffi_backend' module, which is version %s. The two versions should be equal; check your installation.)�cparserZ parsed_typesZ new_types�set_ffiZRTLD_�NULL)/Z _cffi_backend� r �hasattr� Exceptionr r �_backendr �_lockZParser�_parser�_cached_btypes�types� ModuleType�__dict__� _parsed_typesZ _new_types�_function_caches� _libraries� _cdefsources�_included_ffis�_windows_unicode�_init_once_cache� _cdef_version� _embeddingr Z get_typecacheZ _typecacher �list� startswith�setattr�getattr�_get_cached_btypeZ voidp_type�BVoidPZchar_array_type�BCharAr r �castr Z _get_types�CDataZCType�buffer)�self�backendr r �namer r r �__init__' sR z FFI.__init__Fc C s | j |||d� dS )a� Parse the given C source. This registers all declared functions, types, and global variables. The functions and global variables can then be accessed via either 'ffi.dlopen()' or 'ffi.verify()'. The types can be used in 'ffi.new()' and other functions. If 'packed' is specified as True, all structs declared inside this cdef are packed, i.e. laid out without any field alignment at all. )�override�packedN)�_cdef)r/ �csourcer3 r4 r r r �cdefc s zFFI.cdefc C s$ | 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. Note that functions and types declared by 'ffi.cdef()' are not linked to a particular library, just like C headers; in the library we only look for the actual (untyped) symbols. N)r r; �AssertionErrorr �_make_ffi_libraryr r@ r )r/ r1 �flags�libZfunction_cacher r r �dlopen� s z FFI.dlopenc C s t |�j|� dS )z�Close a library obtained with ffi.dlopen(). After this call, access to functions or variables from the library will fail (possibly with a segmentation fault). N)�type�__cffi_close__)r/ rI r r r �dlclose� s z FFI.dlclosec C sj |}|| j kr| j | S t|t�s,|jd�}| jj|�}|j}|rJ|j� }| j|�}||f}|| j |< |S )Nr9 ) r r r: r= r Z parse_typeZis_raw_functionZas_function_pointerr) )r/ �cdecl�keyrK �really_a_function_type�btype�resultr r r �_typeof_locked� s zFFI._typeof_lockedc C sd y| j | }W n0 tk r> | j� | j|�}W d Q R X Y nX |\}}|r`| r`td|f ��|S )Nz>the type %r is a function type, not a pointer-to-function type)r �KeyErrorr rS r )r/ rN � consider_function_as_funcptrrR rQ rP r r r �_typeof� s z FFI._typeofc C s� t |t�r| j|�S t || j�r,| jj|�S t |tj�rLt|�}|dk rL|S t |tj �r|t |d�r|| j � | j |j �S Q R X tt|���dS )z�Parse the C type given as a string and return the corresponding <ctype> object. It can also be used on 'cdata' instance to get its C type. 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. You can also give numeric values which correspond to array items, in case of an array type. r )r r; rV � _typeoffsetof)r/ rN �fields_or_indexesr r r �offsetof� s z FFI.offsetofc C s" t |t�r| j|�}| jj||�S )a� Allocate an instance according to the specified C type and return a pointer to it. The specified C type must be either a pointer or an array: ``new('X *')`` allocates an X and returns a pointer to it, whereas ``new('X[n]')`` allocates an array of n X'es and returns an array referencing it (which works mostly like a pointer, like in C). You can also use ``new('X[]', n)`` to allocate an array of a non-constant length n. The memory is initialized following the rules of declaring a global variable in C: by default it is zero-initialized, but an explicit initializer can be given which can be used to fill all or part of the memory. When the returned <cdata> object goes out of scope, the memory is freed. 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. If 'cdata' is a pointer or array of wchar_t, returns a unicode string following the same rules. If 'cdata' is a single character or byte or a wchar_t, returns it as a string or unicode string. If 'cdata' is an enum, returns the value of the enumerator as a string, or 'NUMBER' if the value is out of range. )r �string)r/ �cdata�maxlenr r r ri % s z FFI.stringc C s | j j||�S )aL Unpack an array of C data of the given length, returning a Python string/unicode/list. If 'cdata' is a pointer to 'char', returns a byte string. It does not stop at the first null. This is equivalent to: ffi.buffer(cdata, length)[:] If 'cdata' is a pointer to 'wchar_t', returns a unicode string. 'length' is measured in wchar_t's; it is not the size in bytes. If 'cdata' is a pointer to anything else, returns a list of 'length' items. This is a faster equivalent to: [cdata[i] for i in range(length)] )r �unpack)r/ rj Zlengthr r r rl 7 s z FFI.unpackc C s | j j| j||�S )a� Return a <cdata 'char[]'> that points to the data of the given Python object, which must support the buffer interface. Note that this is not meant to be used on the built-in types str or unicode (you can build 'char[]' arrays explicitly) but only on objects containing large quantities of raw data in some other format, like 'array.array' or numpy arrays. )r � from_bufferr+ )r/ Z python_bufferZrequire_writabler r r rm U s zFFI.from_bufferc C s | j j|||�S )a_ ffi.memmove(dest, src, n) copies n bytes of memory from src to dest. Like the C function memmove(), the memory areas may overlap; apart from that it behaves like the C function memcpy(). 'src' can be any cdata ptr or array, or any Python buffer object. 'dest' can be any cdata ptr or array, or a writable Python buffer object. The size to copy, 'n', is always measured in bytes. 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. Return a string giving the C type 'cdecl', which may be itself a string or a <ctype> object. If 'replace_with' is given, it gives extra text to append (or insert for more complicated C types), like a variable name, or '*' to get actually the C type 'pointer-to-cdecl'. �*z&[�&z(%s)r z[(� )r r; rV �stripr& r Zgetcname)r/ rN Z replace_withr r r �getctype� s z FFI.getctypec C s | j j|||�S )a� Return a new cdata object that points to the same data. Later, when this new cdata object is garbage-collected, 'destructor(old_cdata_object)' will be called. The optional 'size' gives an estimate of the size, used to trigger the garbage collection more eagerly. So far only used on PyPy. 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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Note that the include() method has no effect on functions, constants and global variables, which must anyway be accessed directly from the lib object returned by the original FFI instance. zGffi.include() expects an argument that is also of type cffi.FFI, not %rzself.include(self)�[�]N) r r r< rK �__name__� ValueErrorr r �includer r@ �extendr )r/ Zffi_to_includer r r r� � s z FFI.includec C s | j j| j|�S )N)r Z newp_handler* )r/ r r r r � new_handle s zFFI.new_handlec C s | j j|�S )N)r � from_handle)r/ r r r r r� s zFFI.from_handlec C s> | j dk rtd��t|�}|r*| jd� n | jd� || _ dS )ac Windows: if 'enabled_flag' is True, enable the UNICODE and _UNICODE defines in C, and declare the types like TCHAR and LPTCSTR to be (pointers to) wchar_t. If 'enabled_flag' is False, declare these types to be (pointers to) plain 8-bit characters. This is mostly for backward compatibility; you usually want True. 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