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749
venv/lib/python3.11/site-packages/Cython/Compiler/Buffer.py
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749
venv/lib/python3.11/site-packages/Cython/Compiler/Buffer.py
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@ -0,0 +1,749 @@
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from __future__ import absolute_import
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from .Visitor import CythonTransform
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from .ModuleNode import ModuleNode
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from .Errors import CompileError
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from .UtilityCode import CythonUtilityCode
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from .Code import UtilityCode, TempitaUtilityCode
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from . import Options
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from . import Interpreter
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from . import PyrexTypes
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from . import Naming
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from . import Symtab
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def dedent(text, reindent=0):
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from textwrap import dedent
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text = dedent(text)
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if reindent > 0:
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indent = " " * reindent
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text = '\n'.join([indent + x for x in text.split('\n')])
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return text
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class IntroduceBufferAuxiliaryVars(CythonTransform):
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#
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# Entry point
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#
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buffers_exists = False
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using_memoryview = False
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def __call__(self, node):
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assert isinstance(node, ModuleNode)
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self.max_ndim = 0
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result = super(IntroduceBufferAuxiliaryVars, self).__call__(node)
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if self.buffers_exists:
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use_bufstruct_declare_code(node.scope)
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use_py2_buffer_functions(node.scope)
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return result
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#
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# Basic operations for transforms
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#
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def handle_scope(self, node, scope):
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# For all buffers, insert extra variables in the scope.
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# The variables are also accessible from the buffer_info
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# on the buffer entry
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scope_items = scope.entries.items()
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bufvars = [entry for name, entry in scope_items if entry.type.is_buffer]
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if len(bufvars) > 0:
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bufvars.sort(key=lambda entry: entry.name)
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self.buffers_exists = True
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memviewslicevars = [entry for name, entry in scope_items if entry.type.is_memoryviewslice]
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if len(memviewslicevars) > 0:
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self.buffers_exists = True
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for (name, entry) in scope_items:
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if name == 'memoryview' and isinstance(entry.utility_code_definition, CythonUtilityCode):
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self.using_memoryview = True
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break
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del scope_items
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if isinstance(node, ModuleNode) and len(bufvars) > 0:
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# for now...note that pos is wrong
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raise CompileError(node.pos, "Buffer vars not allowed in module scope")
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for entry in bufvars:
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if entry.type.dtype.is_ptr:
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raise CompileError(node.pos, "Buffers with pointer types not yet supported.")
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name = entry.name
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buftype = entry.type
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if buftype.ndim > Options.buffer_max_dims:
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raise CompileError(node.pos,
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"Buffer ndims exceeds Options.buffer_max_dims = %d" % Options.buffer_max_dims)
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if buftype.ndim > self.max_ndim:
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self.max_ndim = buftype.ndim
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# Declare auxiliary vars
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def decvar(type, prefix):
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cname = scope.mangle(prefix, name)
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aux_var = scope.declare_var(name=None, cname=cname,
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type=type, pos=node.pos)
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if entry.is_arg:
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aux_var.used = True # otherwise, NameNode will mark whether it is used
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return aux_var
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auxvars = ((PyrexTypes.c_pyx_buffer_nd_type, Naming.pybuffernd_prefix),
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(PyrexTypes.c_pyx_buffer_type, Naming.pybufferstruct_prefix))
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pybuffernd, rcbuffer = [decvar(type, prefix) for (type, prefix) in auxvars]
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entry.buffer_aux = Symtab.BufferAux(pybuffernd, rcbuffer)
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scope.buffer_entries = bufvars
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self.scope = scope
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def visit_ModuleNode(self, node):
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self.handle_scope(node, node.scope)
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self.visitchildren(node)
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return node
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def visit_FuncDefNode(self, node):
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self.handle_scope(node, node.local_scope)
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self.visitchildren(node)
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return node
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#
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# Analysis
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#
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buffer_options = ("dtype", "ndim", "mode", "negative_indices", "cast") # ordered!
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buffer_defaults = {"ndim": 1, "mode": "full", "negative_indices": True, "cast": False}
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buffer_positional_options_count = 1 # anything beyond this needs keyword argument
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ERR_BUF_OPTION_UNKNOWN = '"%s" is not a buffer option'
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ERR_BUF_TOO_MANY = 'Too many buffer options'
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ERR_BUF_DUP = '"%s" buffer option already supplied'
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ERR_BUF_MISSING = '"%s" missing'
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ERR_BUF_MODE = 'Only allowed buffer modes are: "c", "fortran", "full", "strided" (as a compile-time string)'
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ERR_BUF_NDIM = 'ndim must be a non-negative integer'
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ERR_BUF_DTYPE = 'dtype must be "object", numeric type or a struct'
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ERR_BUF_BOOL = '"%s" must be a boolean'
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def analyse_buffer_options(globalpos, env, posargs, dictargs, defaults=None, need_complete=True):
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"""
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Must be called during type analysis, as analyse is called
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on the dtype argument.
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posargs and dictargs should consist of a list and a dict
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of tuples (value, pos). Defaults should be a dict of values.
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Returns a dict containing all the options a buffer can have and
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its value (with the positions stripped).
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"""
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if defaults is None:
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defaults = buffer_defaults
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posargs, dictargs = Interpreter.interpret_compiletime_options(
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posargs, dictargs, type_env=env, type_args=(0, 'dtype'))
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if len(posargs) > buffer_positional_options_count:
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raise CompileError(posargs[-1][1], ERR_BUF_TOO_MANY)
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options = {}
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for name, (value, pos) in dictargs.items():
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if name not in buffer_options:
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raise CompileError(pos, ERR_BUF_OPTION_UNKNOWN % name)
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options[name] = value
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for name, (value, pos) in zip(buffer_options, posargs):
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if name not in buffer_options:
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raise CompileError(pos, ERR_BUF_OPTION_UNKNOWN % name)
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if name in options:
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raise CompileError(pos, ERR_BUF_DUP % name)
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options[name] = value
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# Check that they are all there and copy defaults
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for name in buffer_options:
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if name not in options:
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try:
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options[name] = defaults[name]
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except KeyError:
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if need_complete:
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raise CompileError(globalpos, ERR_BUF_MISSING % name)
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dtype = options.get("dtype")
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if dtype and dtype.is_extension_type:
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raise CompileError(globalpos, ERR_BUF_DTYPE)
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ndim = options.get("ndim")
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if ndim and (not isinstance(ndim, int) or ndim < 0):
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raise CompileError(globalpos, ERR_BUF_NDIM)
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mode = options.get("mode")
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if mode and not (mode in ('full', 'strided', 'c', 'fortran')):
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raise CompileError(globalpos, ERR_BUF_MODE)
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def assert_bool(name):
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x = options.get(name)
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if not isinstance(x, bool):
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raise CompileError(globalpos, ERR_BUF_BOOL % name)
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assert_bool('negative_indices')
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assert_bool('cast')
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return options
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#
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# Code generation
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#
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class BufferEntry(object):
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def __init__(self, entry):
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self.entry = entry
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self.type = entry.type
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self.cname = entry.buffer_aux.buflocal_nd_var.cname
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self.buf_ptr = "%s.rcbuffer->pybuffer.buf" % self.cname
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self.buf_ptr_type = entry.type.buffer_ptr_type
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self.init_attributes()
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def init_attributes(self):
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self.shape = self.get_buf_shapevars()
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self.strides = self.get_buf_stridevars()
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self.suboffsets = self.get_buf_suboffsetvars()
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def get_buf_suboffsetvars(self):
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return self._for_all_ndim("%s.diminfo[%d].suboffsets")
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def get_buf_stridevars(self):
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return self._for_all_ndim("%s.diminfo[%d].strides")
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def get_buf_shapevars(self):
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return self._for_all_ndim("%s.diminfo[%d].shape")
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def _for_all_ndim(self, s):
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return [s % (self.cname, i) for i in range(self.type.ndim)]
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def generate_buffer_lookup_code(self, code, index_cnames):
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# Create buffer lookup and return it
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# This is done via utility macros/inline functions, which vary
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# according to the access mode used.
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params = []
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nd = self.type.ndim
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mode = self.type.mode
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if mode == 'full':
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for i, s, o in zip(index_cnames,
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self.get_buf_stridevars(),
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self.get_buf_suboffsetvars()):
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params.append(i)
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params.append(s)
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params.append(o)
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funcname = "__Pyx_BufPtrFull%dd" % nd
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funcgen = buf_lookup_full_code
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else:
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if mode == 'strided':
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funcname = "__Pyx_BufPtrStrided%dd" % nd
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funcgen = buf_lookup_strided_code
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elif mode == 'c':
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funcname = "__Pyx_BufPtrCContig%dd" % nd
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funcgen = buf_lookup_c_code
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elif mode == 'fortran':
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funcname = "__Pyx_BufPtrFortranContig%dd" % nd
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funcgen = buf_lookup_fortran_code
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else:
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assert False
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for i, s in zip(index_cnames, self.get_buf_stridevars()):
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params.append(i)
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params.append(s)
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# Make sure the utility code is available
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if funcname not in code.globalstate.utility_codes:
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code.globalstate.utility_codes.add(funcname)
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protocode = code.globalstate['utility_code_proto']
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defcode = code.globalstate['utility_code_def']
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funcgen(protocode, defcode, name=funcname, nd=nd)
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buf_ptr_type_code = self.buf_ptr_type.empty_declaration_code()
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ptrcode = "%s(%s, %s, %s)" % (funcname, buf_ptr_type_code, self.buf_ptr,
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", ".join(params))
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return ptrcode
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def get_flags(buffer_aux, buffer_type):
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flags = 'PyBUF_FORMAT'
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mode = buffer_type.mode
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if mode == 'full':
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flags += '| PyBUF_INDIRECT'
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elif mode == 'strided':
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flags += '| PyBUF_STRIDES'
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elif mode == 'c':
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flags += '| PyBUF_C_CONTIGUOUS'
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elif mode == 'fortran':
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flags += '| PyBUF_F_CONTIGUOUS'
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else:
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assert False
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if buffer_aux.writable_needed: flags += "| PyBUF_WRITABLE"
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return flags
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def used_buffer_aux_vars(entry):
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buffer_aux = entry.buffer_aux
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buffer_aux.buflocal_nd_var.used = True
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buffer_aux.rcbuf_var.used = True
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def put_unpack_buffer_aux_into_scope(buf_entry, code):
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# Generate code to copy the needed struct info into local
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# variables.
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buffer_aux, mode = buf_entry.buffer_aux, buf_entry.type.mode
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pybuffernd_struct = buffer_aux.buflocal_nd_var.cname
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fldnames = ['strides', 'shape']
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if mode == 'full':
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fldnames.append('suboffsets')
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ln = []
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for i in range(buf_entry.type.ndim):
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for fldname in fldnames:
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ln.append("%s.diminfo[%d].%s = %s.rcbuffer->pybuffer.%s[%d];" % (
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pybuffernd_struct, i, fldname,
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pybuffernd_struct, fldname, i,
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))
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code.putln(' '.join(ln))
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def put_init_vars(entry, code):
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bufaux = entry.buffer_aux
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pybuffernd_struct = bufaux.buflocal_nd_var.cname
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pybuffer_struct = bufaux.rcbuf_var.cname
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# init pybuffer_struct
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code.putln("%s.pybuffer.buf = NULL;" % pybuffer_struct)
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code.putln("%s.refcount = 0;" % pybuffer_struct)
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# init the buffer object
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# code.put_init_var_to_py_none(entry)
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# init the pybuffernd_struct
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code.putln("%s.data = NULL;" % pybuffernd_struct)
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code.putln("%s.rcbuffer = &%s;" % (pybuffernd_struct, pybuffer_struct))
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def put_acquire_arg_buffer(entry, code, pos):
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buffer_aux = entry.buffer_aux
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getbuffer = get_getbuffer_call(code, entry.cname, buffer_aux, entry.type)
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# Acquire any new buffer
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code.putln("{")
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code.putln("__Pyx_BufFmt_StackElem __pyx_stack[%d];" % entry.type.dtype.struct_nesting_depth())
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code.putln(code.error_goto_if("%s == -1" % getbuffer, pos))
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code.putln("}")
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# An exception raised in arg parsing cannot be caught, so no
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# need to care about the buffer then.
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put_unpack_buffer_aux_into_scope(entry, code)
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def put_release_buffer_code(code, entry):
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code.globalstate.use_utility_code(acquire_utility_code)
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code.putln("__Pyx_SafeReleaseBuffer(&%s.rcbuffer->pybuffer);" % entry.buffer_aux.buflocal_nd_var.cname)
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def get_getbuffer_call(code, obj_cname, buffer_aux, buffer_type):
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ndim = buffer_type.ndim
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cast = int(buffer_type.cast)
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flags = get_flags(buffer_aux, buffer_type)
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pybuffernd_struct = buffer_aux.buflocal_nd_var.cname
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dtype_typeinfo = get_type_information_cname(code, buffer_type.dtype)
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code.globalstate.use_utility_code(acquire_utility_code)
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return ("__Pyx_GetBufferAndValidate(&%(pybuffernd_struct)s.rcbuffer->pybuffer, "
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"(PyObject*)%(obj_cname)s, &%(dtype_typeinfo)s, %(flags)s, %(ndim)d, "
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"%(cast)d, __pyx_stack)" % locals())
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def put_assign_to_buffer(lhs_cname, rhs_cname, buf_entry,
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is_initialized, pos, code):
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"""
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Generate code for reassigning a buffer variables. This only deals with getting
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the buffer auxiliary structure and variables set up correctly, the assignment
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itself and refcounting is the responsibility of the caller.
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|
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However, the assignment operation may throw an exception so that the reassignment
|
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never happens.
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||||
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||||
Depending on the circumstances there are two possible outcomes:
|
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- Old buffer released, new acquired, rhs assigned to lhs
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- Old buffer released, new acquired which fails, reaqcuire old lhs buffer
|
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(which may or may not succeed).
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||||
"""
|
||||
|
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buffer_aux, buffer_type = buf_entry.buffer_aux, buf_entry.type
|
||||
pybuffernd_struct = buffer_aux.buflocal_nd_var.cname
|
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flags = get_flags(buffer_aux, buffer_type)
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|
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code.putln("{") # Set up necessary stack for getbuffer
|
||||
code.putln("__Pyx_BufFmt_StackElem __pyx_stack[%d];" % buffer_type.dtype.struct_nesting_depth())
|
||||
|
||||
getbuffer = get_getbuffer_call(code, "%s", buffer_aux, buffer_type) # fill in object below
|
||||
|
||||
if is_initialized:
|
||||
# Release any existing buffer
|
||||
code.putln('__Pyx_SafeReleaseBuffer(&%s.rcbuffer->pybuffer);' % pybuffernd_struct)
|
||||
# Acquire
|
||||
retcode_cname = code.funcstate.allocate_temp(PyrexTypes.c_int_type, manage_ref=False)
|
||||
code.putln("%s = %s;" % (retcode_cname, getbuffer % rhs_cname))
|
||||
code.putln('if (%s) {' % (code.unlikely("%s < 0" % retcode_cname)))
|
||||
# If acquisition failed, attempt to reacquire the old buffer
|
||||
# before raising the exception. A failure of reacquisition
|
||||
# will cause the reacquisition exception to be reported, one
|
||||
# can consider working around this later.
|
||||
exc_temps = tuple(code.funcstate.allocate_temp(PyrexTypes.py_object_type, manage_ref=False)
|
||||
for _ in range(3))
|
||||
code.putln('PyErr_Fetch(&%s, &%s, &%s);' % exc_temps)
|
||||
code.putln('if (%s) {' % code.unlikely("%s == -1" % (getbuffer % lhs_cname)))
|
||||
code.putln('Py_XDECREF(%s); Py_XDECREF(%s); Py_XDECREF(%s);' % exc_temps) # Do not refnanny these!
|
||||
code.globalstate.use_utility_code(raise_buffer_fallback_code)
|
||||
code.putln('__Pyx_RaiseBufferFallbackError();')
|
||||
code.putln('} else {')
|
||||
code.putln('PyErr_Restore(%s, %s, %s);' % exc_temps)
|
||||
code.putln('}')
|
||||
code.putln('%s = %s = %s = 0;' % exc_temps)
|
||||
for t in exc_temps:
|
||||
code.funcstate.release_temp(t)
|
||||
code.putln('}')
|
||||
# Unpack indices
|
||||
put_unpack_buffer_aux_into_scope(buf_entry, code)
|
||||
code.putln(code.error_goto_if_neg(retcode_cname, pos))
|
||||
code.funcstate.release_temp(retcode_cname)
|
||||
else:
|
||||
# Our entry had no previous value, so set to None when acquisition fails.
|
||||
# In this case, auxiliary vars should be set up right in initialization to a zero-buffer,
|
||||
# so it suffices to set the buf field to NULL.
|
||||
code.putln('if (%s) {' % code.unlikely("%s == -1" % (getbuffer % rhs_cname)))
|
||||
code.putln('%s = %s; __Pyx_INCREF(Py_None); %s.rcbuffer->pybuffer.buf = NULL;' %
|
||||
(lhs_cname,
|
||||
PyrexTypes.typecast(buffer_type, PyrexTypes.py_object_type, "Py_None"),
|
||||
pybuffernd_struct))
|
||||
code.putln(code.error_goto(pos))
|
||||
code.put('} else {')
|
||||
# Unpack indices
|
||||
put_unpack_buffer_aux_into_scope(buf_entry, code)
|
||||
code.putln('}')
|
||||
|
||||
code.putln("}") # Release stack
|
||||
|
||||
|
||||
def put_buffer_lookup_code(entry, index_signeds, index_cnames, directives,
|
||||
pos, code, negative_indices, in_nogil_context):
|
||||
"""
|
||||
Generates code to process indices and calculate an offset into
|
||||
a buffer. Returns a C string which gives a pointer which can be
|
||||
read from or written to at will (it is an expression so caller should
|
||||
store it in a temporary if it is used more than once).
|
||||
|
||||
As the bounds checking can have any number of combinations of unsigned
|
||||
arguments, smart optimizations etc. we insert it directly in the function
|
||||
body. The lookup however is delegated to a inline function that is instantiated
|
||||
once per ndim (lookup with suboffsets tend to get quite complicated).
|
||||
|
||||
entry is a BufferEntry
|
||||
"""
|
||||
negative_indices = directives['wraparound'] and negative_indices
|
||||
|
||||
if directives['boundscheck']:
|
||||
# Check bounds and fix negative indices.
|
||||
# We allocate a temporary which is initialized to -1, meaning OK (!).
|
||||
# If an error occurs, the temp is set to the index dimension the
|
||||
# error is occurring at.
|
||||
failed_dim_temp = code.funcstate.allocate_temp(PyrexTypes.c_int_type, manage_ref=False)
|
||||
code.putln("%s = -1;" % failed_dim_temp)
|
||||
for dim, (signed, cname, shape) in enumerate(zip(index_signeds, index_cnames, entry.get_buf_shapevars())):
|
||||
if signed != 0:
|
||||
# not unsigned, deal with negative index
|
||||
code.putln("if (%s < 0) {" % cname)
|
||||
if negative_indices:
|
||||
code.putln("%s += %s;" % (cname, shape))
|
||||
code.putln("if (%s) %s = %d;" % (
|
||||
code.unlikely("%s < 0" % cname),
|
||||
failed_dim_temp, dim))
|
||||
else:
|
||||
code.putln("%s = %d;" % (failed_dim_temp, dim))
|
||||
code.put("} else ")
|
||||
# check bounds in positive direction
|
||||
if signed != 0:
|
||||
cast = ""
|
||||
else:
|
||||
cast = "(size_t)"
|
||||
code.putln("if (%s) %s = %d;" % (
|
||||
code.unlikely("%s >= %s%s" % (cname, cast, shape)),
|
||||
failed_dim_temp, dim))
|
||||
|
||||
if in_nogil_context:
|
||||
code.globalstate.use_utility_code(raise_indexerror_nogil)
|
||||
func = '__Pyx_RaiseBufferIndexErrorNogil'
|
||||
else:
|
||||
code.globalstate.use_utility_code(raise_indexerror_code)
|
||||
func = '__Pyx_RaiseBufferIndexError'
|
||||
|
||||
code.putln("if (%s) {" % code.unlikely("%s != -1" % failed_dim_temp))
|
||||
code.putln('%s(%s);' % (func, failed_dim_temp))
|
||||
code.putln(code.error_goto(pos))
|
||||
code.putln('}')
|
||||
code.funcstate.release_temp(failed_dim_temp)
|
||||
elif negative_indices:
|
||||
# Only fix negative indices.
|
||||
for signed, cname, shape in zip(index_signeds, index_cnames, entry.get_buf_shapevars()):
|
||||
if signed != 0:
|
||||
code.putln("if (%s < 0) %s += %s;" % (cname, cname, shape))
|
||||
|
||||
return entry.generate_buffer_lookup_code(code, index_cnames)
|
||||
|
||||
|
||||
def use_bufstruct_declare_code(env):
|
||||
env.use_utility_code(buffer_struct_declare_code)
|
||||
|
||||
|
||||
def buf_lookup_full_code(proto, defin, name, nd):
|
||||
"""
|
||||
Generates a buffer lookup function for the right number
|
||||
of dimensions. The function gives back a void* at the right location.
|
||||
"""
|
||||
# _i_ndex, _s_tride, sub_o_ffset
|
||||
macroargs = ", ".join(["i%d, s%d, o%d" % (i, i, i) for i in range(nd)])
|
||||
proto.putln("#define %s(type, buf, %s) (type)(%s_imp(buf, %s))" % (name, macroargs, name, macroargs))
|
||||
|
||||
funcargs = ", ".join(["Py_ssize_t i%d, Py_ssize_t s%d, Py_ssize_t o%d" % (i, i, i) for i in range(nd)])
|
||||
proto.putln("static CYTHON_INLINE void* %s_imp(void* buf, %s);" % (name, funcargs))
|
||||
defin.putln(dedent("""
|
||||
static CYTHON_INLINE void* %s_imp(void* buf, %s) {
|
||||
char* ptr = (char*)buf;
|
||||
""") % (name, funcargs) + "".join([dedent("""\
|
||||
ptr += s%d * i%d;
|
||||
if (o%d >= 0) ptr = *((char**)ptr) + o%d;
|
||||
""") % (i, i, i, i) for i in range(nd)]
|
||||
) + "\nreturn ptr;\n}")
|
||||
|
||||
|
||||
def buf_lookup_strided_code(proto, defin, name, nd):
|
||||
"""
|
||||
Generates a buffer lookup function for the right number
|
||||
of dimensions. The function gives back a void* at the right location.
|
||||
"""
|
||||
# _i_ndex, _s_tride
|
||||
args = ", ".join(["i%d, s%d" % (i, i) for i in range(nd)])
|
||||
offset = " + ".join(["i%d * s%d" % (i, i) for i in range(nd)])
|
||||
proto.putln("#define %s(type, buf, %s) (type)((char*)buf + %s)" % (name, args, offset))
|
||||
|
||||
|
||||
def buf_lookup_c_code(proto, defin, name, nd):
|
||||
"""
|
||||
Similar to strided lookup, but can assume that the last dimension
|
||||
doesn't need a multiplication as long as.
|
||||
Still we keep the same signature for now.
|
||||
"""
|
||||
if nd == 1:
|
||||
proto.putln("#define %s(type, buf, i0, s0) ((type)buf + i0)" % name)
|
||||
else:
|
||||
args = ", ".join(["i%d, s%d" % (i, i) for i in range(nd)])
|
||||
offset = " + ".join(["i%d * s%d" % (i, i) for i in range(nd - 1)])
|
||||
proto.putln("#define %s(type, buf, %s) ((type)((char*)buf + %s) + i%d)" % (name, args, offset, nd - 1))
|
||||
|
||||
|
||||
def buf_lookup_fortran_code(proto, defin, name, nd):
|
||||
"""
|
||||
Like C lookup, but the first index is optimized instead.
|
||||
"""
|
||||
if nd == 1:
|
||||
proto.putln("#define %s(type, buf, i0, s0) ((type)buf + i0)" % name)
|
||||
else:
|
||||
args = ", ".join(["i%d, s%d" % (i, i) for i in range(nd)])
|
||||
offset = " + ".join(["i%d * s%d" % (i, i) for i in range(1, nd)])
|
||||
proto.putln("#define %s(type, buf, %s) ((type)((char*)buf + %s) + i%d)" % (name, args, offset, 0))
|
||||
|
||||
|
||||
def use_py2_buffer_functions(env):
|
||||
env.use_utility_code(GetAndReleaseBufferUtilityCode())
|
||||
|
||||
|
||||
class GetAndReleaseBufferUtilityCode(object):
|
||||
# Emulation of PyObject_GetBuffer and PyBuffer_Release for Python 2.
|
||||
# For >= 2.6 we do double mode -- use the new buffer interface on objects
|
||||
# which has the right tp_flags set, but emulation otherwise.
|
||||
|
||||
requires = None
|
||||
is_cython_utility = False
|
||||
|
||||
def __init__(self):
|
||||
pass
|
||||
|
||||
def __eq__(self, other):
|
||||
return isinstance(other, GetAndReleaseBufferUtilityCode)
|
||||
|
||||
def __hash__(self):
|
||||
return 24342342
|
||||
|
||||
def get_tree(self, **kwargs): pass
|
||||
|
||||
def put_code(self, output):
|
||||
code = output['utility_code_def']
|
||||
proto_code = output['utility_code_proto']
|
||||
env = output.module_node.scope
|
||||
cython_scope = env.context.cython_scope
|
||||
|
||||
# Search all types for __getbuffer__ overloads
|
||||
types = []
|
||||
visited_scopes = set()
|
||||
def find_buffer_types(scope):
|
||||
if scope in visited_scopes:
|
||||
return
|
||||
visited_scopes.add(scope)
|
||||
for m in scope.cimported_modules:
|
||||
find_buffer_types(m)
|
||||
for e in scope.type_entries:
|
||||
if isinstance(e.utility_code_definition, CythonUtilityCode):
|
||||
continue
|
||||
t = e.type
|
||||
if t.is_extension_type:
|
||||
if scope is cython_scope and not e.used:
|
||||
continue
|
||||
release = get = None
|
||||
for x in t.scope.pyfunc_entries:
|
||||
if x.name == u"__getbuffer__": get = x.func_cname
|
||||
elif x.name == u"__releasebuffer__": release = x.func_cname
|
||||
if get:
|
||||
types.append((t.typeptr_cname, get, release))
|
||||
|
||||
find_buffer_types(env)
|
||||
|
||||
util_code = TempitaUtilityCode.load(
|
||||
"GetAndReleaseBuffer", from_file="Buffer.c",
|
||||
context=dict(types=types))
|
||||
|
||||
proto = util_code.format_code(util_code.proto)
|
||||
impl = util_code.format_code(
|
||||
util_code.inject_string_constants(util_code.impl, output)[1])
|
||||
|
||||
proto_code.putln(proto)
|
||||
code.putln(impl)
|
||||
|
||||
|
||||
def mangle_dtype_name(dtype):
|
||||
# Use prefixes to separate user defined types from builtins
|
||||
# (consider "typedef float unsigned_int")
|
||||
if dtype.is_pyobject:
|
||||
return "object"
|
||||
elif dtype.is_ptr:
|
||||
return "ptr"
|
||||
else:
|
||||
if dtype.is_typedef or dtype.is_struct_or_union:
|
||||
prefix = "nn_"
|
||||
else:
|
||||
prefix = ""
|
||||
return prefix + dtype.specialization_name()
|
||||
|
||||
def get_type_information_cname(code, dtype, maxdepth=None):
|
||||
"""
|
||||
Output the run-time type information (__Pyx_TypeInfo) for given dtype,
|
||||
and return the name of the type info struct.
|
||||
|
||||
Structs with two floats of the same size are encoded as complex numbers.
|
||||
One can separate between complex numbers declared as struct or with native
|
||||
encoding by inspecting to see if the fields field of the type is
|
||||
filled in.
|
||||
"""
|
||||
namesuffix = mangle_dtype_name(dtype)
|
||||
name = "__Pyx_TypeInfo_%s" % namesuffix
|
||||
structinfo_name = "__Pyx_StructFields_%s" % namesuffix
|
||||
|
||||
if dtype.is_error: return "<error>"
|
||||
|
||||
# It's critical that walking the type info doesn't use more stack
|
||||
# depth than dtype.struct_nesting_depth() returns, so use an assertion for this
|
||||
if maxdepth is None: maxdepth = dtype.struct_nesting_depth()
|
||||
if maxdepth <= 0:
|
||||
assert False
|
||||
|
||||
if name not in code.globalstate.utility_codes:
|
||||
code.globalstate.utility_codes.add(name)
|
||||
typecode = code.globalstate['typeinfo']
|
||||
|
||||
arraysizes = []
|
||||
if dtype.is_array:
|
||||
while dtype.is_array:
|
||||
arraysizes.append(dtype.size)
|
||||
dtype = dtype.base_type
|
||||
|
||||
complex_possible = dtype.is_struct_or_union and dtype.can_be_complex()
|
||||
|
||||
declcode = dtype.empty_declaration_code()
|
||||
if dtype.is_simple_buffer_dtype():
|
||||
structinfo_name = "NULL"
|
||||
elif dtype.is_struct:
|
||||
struct_scope = dtype.scope
|
||||
if dtype.is_cv_qualified:
|
||||
struct_scope = struct_scope.base_type_scope
|
||||
# Must pre-call all used types in order not to recurse during utility code writing.
|
||||
fields = struct_scope.var_entries
|
||||
assert len(fields) > 0
|
||||
types = [get_type_information_cname(code, f.type, maxdepth - 1)
|
||||
for f in fields]
|
||||
typecode.putln("static __Pyx_StructField %s[] = {" % structinfo_name, safe=True)
|
||||
|
||||
if dtype.is_cv_qualified:
|
||||
# roughly speaking, remove "const" from struct_type
|
||||
struct_type = dtype.cv_base_type.empty_declaration_code()
|
||||
else:
|
||||
struct_type = dtype.empty_declaration_code()
|
||||
|
||||
for f, typeinfo in zip(fields, types):
|
||||
typecode.putln(' {&%s, "%s", offsetof(%s, %s)},' %
|
||||
(typeinfo, f.name, struct_type, f.cname), safe=True)
|
||||
|
||||
typecode.putln(' {NULL, NULL, 0}', safe=True)
|
||||
typecode.putln("};", safe=True)
|
||||
else:
|
||||
assert False
|
||||
|
||||
rep = str(dtype)
|
||||
|
||||
flags = "0"
|
||||
is_unsigned = "0"
|
||||
if dtype is PyrexTypes.c_char_type:
|
||||
is_unsigned = "__PYX_IS_UNSIGNED(%s)" % declcode
|
||||
typegroup = "'H'"
|
||||
elif dtype.is_int:
|
||||
is_unsigned = "__PYX_IS_UNSIGNED(%s)" % declcode
|
||||
typegroup = "%s ? 'U' : 'I'" % is_unsigned
|
||||
elif complex_possible or dtype.is_complex:
|
||||
typegroup = "'C'"
|
||||
elif dtype.is_float:
|
||||
typegroup = "'R'"
|
||||
elif dtype.is_struct:
|
||||
typegroup = "'S'"
|
||||
if dtype.packed:
|
||||
flags = "__PYX_BUF_FLAGS_PACKED_STRUCT"
|
||||
elif dtype.is_pyobject:
|
||||
typegroup = "'O'"
|
||||
else:
|
||||
assert False, dtype
|
||||
|
||||
typeinfo = ('static __Pyx_TypeInfo %s = '
|
||||
'{ "%s", %s, sizeof(%s), { %s }, %s, %s, %s, %s };')
|
||||
tup = (name, rep, structinfo_name, declcode,
|
||||
', '.join([str(x) for x in arraysizes]) or '0', len(arraysizes),
|
||||
typegroup, is_unsigned, flags)
|
||||
typecode.putln(typeinfo % tup, safe=True)
|
||||
|
||||
return name
|
||||
|
||||
def load_buffer_utility(util_code_name, context=None, **kwargs):
|
||||
if context is None:
|
||||
return UtilityCode.load(util_code_name, "Buffer.c", **kwargs)
|
||||
else:
|
||||
return TempitaUtilityCode.load(util_code_name, "Buffer.c", context=context, **kwargs)
|
||||
|
||||
context = dict(max_dims=Options.buffer_max_dims)
|
||||
buffer_struct_declare_code = load_buffer_utility("BufferStructDeclare", context=context)
|
||||
buffer_formats_declare_code = load_buffer_utility("BufferFormatStructs")
|
||||
|
||||
# Utility function to set the right exception
|
||||
# The caller should immediately goto_error
|
||||
raise_indexerror_code = load_buffer_utility("BufferIndexError")
|
||||
raise_indexerror_nogil = load_buffer_utility("BufferIndexErrorNogil")
|
||||
raise_buffer_fallback_code = load_buffer_utility("BufferFallbackError")
|
||||
|
||||
acquire_utility_code = load_buffer_utility("BufferGetAndValidate", context=context)
|
||||
buffer_format_check_code = load_buffer_utility("BufferFormatCheck", context=context)
|
||||
|
||||
# See utility code BufferFormatFromTypeInfo
|
||||
_typeinfo_to_format_code = load_buffer_utility("TypeInfoToFormat")
|
||||
Reference in New Issue
Block a user