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+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# Halide code generation tool
+
+__author__ = __maintainer__ = "Jérôme Carretero <cJ-waf@zougloub.eu>"
+__copyright__ = "Jérôme Carretero, 2014"
+
+"""
+
+Tool to run `Halide <http://halide-lang.org>`_ code generators.
+
+Usage::
+
+ bld(
+ name='pipeline',
+ # ^ Reference this in use="..." for things using the generated code
+ #target=['pipeline.o', 'pipeline.h']
+ # ^ by default, name.{o,h} is added, but you can set the outputs here
+ features='halide',
+ halide_env="HL_TRACE=1 HL_TARGET=host-opencl-gpu_debug",
+ # ^ Environment passed to the generator,
+ # can be a dict, k/v list, or string.
+ args=[],
+ # ^ Command-line arguments to the generator (optional),
+ # eg. to give parameters to the scheduling
+ source='pipeline_gen',
+ # ^ Name of the source executable
+ )
+
+
+Known issues:
+
+
+- Currently only supports Linux (no ".exe")
+
+- Doesn't rerun on input modification when input is part of a build
+ chain, and has been modified externally.
+
+"""
+
+import os
+from waflib import Task, Utils, Options, TaskGen, Errors
+
+class run_halide_gen(Task.Task):
+ color = 'CYAN'
+ vars = ['HALIDE_ENV', 'HALIDE_ARGS']
+ run_str = "${SRC[0].abspath()} ${HALIDE_ARGS}"
+ def __str__(self):
+ stuff = "halide"
+ stuff += ("[%s]" % (",".join(
+ ('%s=%s' % (k,v)) for k, v in sorted(self.env.env.items()))))
+ return Task.Task.__str__(self).replace(self.__class__.__name__,
+ stuff)
+
+@TaskGen.feature('halide')
+@TaskGen.before_method('process_source')
+def halide(self):
+ Utils.def_attrs(self,
+ args=[],
+ halide_env={},
+ )
+
+ bld = self.bld
+
+ env = self.halide_env
+ try:
+ if isinstance(env, str):
+ env = dict(x.split('=') for x in env.split())
+ elif isinstance(env, list):
+ env = dict(x.split('=') for x in env)
+ assert isinstance(env, dict)
+ except Exception as e:
+ if not isinstance(e, ValueError) \
+ and not isinstance(e, AssertionError):
+ raise
+ raise Errors.WafError(
+ "halide_env must be under the form" \
+ " {'HL_x':'a', 'HL_y':'b'}" \
+ " or ['HL_x=y', 'HL_y=b']" \
+ " or 'HL_x=y HL_y=b'")
+
+ src = self.to_nodes(self.source)
+ assert len(src) == 1, "Only one source expected"
+ src = src[0]
+
+ args = Utils.to_list(self.args)
+
+ def change_ext(src, ext):
+ # Return a node with a new extension, in an appropriate folder
+ name = src.name
+ xpos = src.name.rfind('.')
+ if xpos == -1:
+ xpos = len(src.name)
+ newname = name[:xpos] + ext
+ if src.is_child_of(bld.bldnode):
+ node = src.get_src().parent.find_or_declare(newname)
+ else:
+ node = bld.bldnode.find_or_declare(newname)
+ return node
+
+ def to_nodes(self, lst, path=None):
+ tmp = []
+ path = path or self.path
+ find = path.find_or_declare
+
+ if isinstance(lst, self.path.__class__):
+ lst = [lst]
+
+ for x in Utils.to_list(lst):
+ if isinstance(x, str):
+ node = find(x)
+ else:
+ node = x
+ tmp.append(node)
+ return tmp
+
+ tgt = to_nodes(self, self.target)
+ if not tgt:
+ tgt = [change_ext(src, '.o'), change_ext(src, '.h')]
+ cwd = tgt[0].parent.abspath()
+ task = self.create_task('run_halide_gen', src, tgt, cwd=cwd)
+ task.env.append_unique('HALIDE_ARGS', args)
+ if task.env.env == []:
+ task.env.env = {}
+ task.env.env.update(env)
+ task.env.HALIDE_ENV = " ".join(("%s=%s" % (k,v)) for (k,v) in sorted(env.items()))
+ task.env.HALIDE_ARGS = args
+
+ try:
+ self.compiled_tasks.append(task)
+ except AttributeError:
+ self.compiled_tasks = [task]
+ self.source = []
+
+def configure(conf):
+ if Options.options.halide_root is None:
+ conf.check_cfg(package='Halide', args='--cflags --libs')
+ else:
+ halide_root = Options.options.halide_root
+ conf.env.INCLUDES_HALIDE = [ os.path.join(halide_root, "include") ]
+ conf.env.LIBPATH_HALIDE = [ os.path.join(halide_root, "lib") ]
+ conf.env.LIB_HALIDE = ["Halide"]
+
+ # You might want to add this, while upstream doesn't fix it
+ #conf.env.LIB_HALIDE += ['ncurses', 'dl', 'pthread']
+
+def options(opt):
+ opt.add_option('--halide-root',
+ help="path to Halide include and lib files",
+ )
+