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Adding generic Python range and iterator bindings

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-06-01 15:02:38 +02:00
parent d62f7abd95
commit a7415bfbc3
1 changed files with 83 additions and 3 deletions
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common/pybindings.cc
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@ -1,15 +1,95 @@
/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
* Copyright (C) 2018 David Shah <dave@ds0.me>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "design.h"
#include "chip.h"
#include <utility>
#include <stdexcept>
#include <boost/python.hpp>
#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
#include <boost/python/suite/indexing/map_indexing_suite.hpp>
#include <boost/python/suite/indexing/map_indexing_suite.hpp>
using namespace boost::python;
#define PASTER(x,y) x ## _ ## y
#define EVALUATOR(x,y) PASTER(x,y)
#define PASTER(x, y) x ## _ ## y
#define EVALUATOR(x, y) PASTER(x,y)
#define MODULE_NAME EVALUATOR(nextpnrpy, ARCHNAME)
/*
A wrapper for a Pythonised nextpnr Iterator. The actual class wrapped is a
pair<Iterator, Iterator> containing (current, end)
*/
template<typename T>
struct iterator_wrapper {
typedef decltype(*(std::declval<T>())) value_t;
static value_t next(std::pair<T, T> &iter) {
if (iter.first != iter.second) {
value_t val = *iter.first;
++iter.first;
return val;
} else {
PyErr_SetString(PyExc_StopIteration, "End of range reached");
boost::python::throw_error_already_set();
// Should be unreachable, but prevent control may reach end of non-void
throw std::runtime_error("unreachable");
}
}
static void wrap(const char *python_name) {
class_<std::pair<T, T>>(python_name, no_init)
.def("next", next);
}
};
/*
A wrapper for a nextpnr Range. Ranges should have two functions, begin()
and end() which return iterator-like objects supporting ++, * and !=
Full STL iterator semantics are not required, unlike the standard Boost wrappers
*/
inline object pass_through(object const &o) { return o; }
template<typename T>
struct range_wrapper {
typedef decltype(std::declval<T>().begin()) iterator_t;
static std::pair<iterator_t, iterator_t> iter(T &range) {
return std::make_pair(range.begin(), range.end());
}
static void wrap(const char *range_name, const char *iter_name) {
class_<T>(range_name, no_init)
.def("__iter__", iter);
iterator_wrapper<iterator_t>().wrap(iter_name);
}
};
#define WRAP_RANGE(t) range_wrapper<t##Range>().wrap(#t "Range", #t "Iterator")
BOOST_PYTHON_MODULE (MODULE_NAME) {
// From Chip.h
class_<ChipArgs>("ChipArgs");
WRAP_RANGE(Bels);
WRAP_RANGE(AllWires);
WRAP_RANGE(WireDelay);
WRAP_RANGE(BelPin);
}