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# =============================================================================
# ____ _ _ ____ _ _ _ _ _ _ _
# _ __ _ _ / ___| | | | _ \| | | (_) |__ __ _| |__ __| | |
# | '_ \| | | | | _| |_| | | | | | | | | '_ \ / _` | '_ \ / _` | |
# | |_) | |_| | |_| | _ | |_| | |___ _| | | |_) | (_| | | | | (_| | |
# | .__/ \__, |\____|_| |_|____/|_____(_)_|_|_.__/ \__, |_| |_|\__,_|_|
# |_| |___/ |___/
# =============================================================================
# Authors:
# Patrick Lehmann
#
# Package module: Python binding and low-level API for shared library 'libghdl'.
#
# License:
# ============================================================================
# Copyright (C) 2019-2021 Tristan Gingold
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <gnu.org/licenses>.
#
# SPDX-License-Identifier: GPL-2.0-or-later
# ============================================================================
#
from ctypes import (
c_int32,
c_uint32,
c_char_p,
c_bool,
c_double,
Structure,
c_char,
c_uint64,
c_int64,
)
from enum import IntEnum
from functools import wraps
from typing import Callable, List, Dict, Any, TypeVar
from pydecor import export
from pyGHDL.libghdl import libghdl, LibGHDLException
@export
def EnumLookupTable(cls) -> Callable:
"""
Decorator to precalculate a enum lookup table (LUT) for enum position to
enum literal name.
:param cls: Enumerator class for which a LUT shall be pre-calculated.
"""
def decorator(func) -> Callable:
def gen() -> List[str]:
d = [e for e in dir(cls) if e[0] != "_"]
res = [None] * len(d)
for e in d:
res[getattr(cls, e)] = e
return res
__lut = gen()
@wraps(func)
def wrapper(id: int) -> str:
# function that replaces the placeholder function
return __lut[id]
return wrapper
return decorator
def BindToLibGHDL(subprogramName):
"""
This decorator creates a Python function to interface with subprograms in
libghdl via :mod:`ctypes`.
:param subprogramName: Name of the subprogram in *libghdl*.
"""
def PythonTypeToCtype(typ):
if typ is None:
return None
elif typ is int:
return c_int32
elif typ is float:
return c_double
elif typ is bool:
return c_bool
elif typ is bytes:
return c_char_p
elif typ in (c_char, c_char_p):
return typ
elif isinstance(typ, TypeVar):
# Humm, recurse ?
if typ.__bound__ is int:
return c_int32
if typ.__bound__ is float:
return c_double
if typ.__bound__ in (
c_bool,
c_uint32,
c_int32,
c_uint64,
c_int64,
c_double,
):
return typ.__bound__
raise TypeError("Unsupported typevar bound to {!s}".format(typ.__bound__))
elif issubclass(typ, IntEnum):
return c_int32
elif issubclass(typ, Structure):
return typ
raise TypeError
def wrapper(func: Callable):
typeHints: Dict[str, Any] = func.__annotations__
typeHintCount = len(typeHints)
if typeHintCount == 0:
raise ValueError("Function {0} is not annotated with types.".format(func.__name__))
try:
returnType = typeHints["return"]
except KeyError:
raise ValueError("Function {0} is not annotated with a return type.".format(func.__name__))
if (typeHintCount - 1) != func.__code__.co_argcount:
raise ValueError(
"Number of type annotations ({0}) for function '{1}' does not match number of parameters ({2}).".format(
typeHintCount - 1, func.__name__, func.__code__.co_argcount
)
)
# print(typeHints)
parameters = typeHints.copy()
del parameters["return"]
parameterTypes = []
for parameter in parameters.values():
try:
parameterTypes.append(PythonTypeToCtype(parameter))
except TypeError:
raise TypeError(
"Unsupported parameter type '{0!s}' in function '{1}'.".format(parameter, func.__name__)
)
try:
resultType = PythonTypeToCtype(returnType)
except TypeError:
raise TypeError("Unsupported return type '{0!s}' in function '{1}'.".format(returnType, func.__name__))
functionPointer = getattr(libghdl, subprogramName)
functionPointer.parameterTypes = parameterTypes
functionPointer.restype = resultType
if isinstance(returnType, type) and issubclass(returnType, IntEnum):
@wraps(func)
def inner(*args):
try:
returnValue = functionPointer(*args)
except OSError as ex:
errors = [str(ex)]
raise LibGHDLException(
"Caught exception when calling '{func}' in libghdl.".format(func=subprogramName),
errors,
) from ex
return returnType(returnValue)
return inner
else:
@wraps(func)
def inner(*args):
try:
return functionPointer(*args)
except OSError as ex:
errors = [str(ex)]
raise LibGHDLException(
"Caught exception when calling '{func}' in libghdl.".format(func=subprogramName),
errors,
) from ex
return inner
return wrapper
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