444 lines
15 KiB
Python
Vendored
444 lines
15 KiB
Python
Vendored
# MIT License
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#
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# Copyright The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import os
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import shutil
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from os.path import join as joinpath
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from collections import OrderedDict
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import SCons
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from SCons.Action import get_default_ENV, _string_from_cmd_list
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from SCons.Script import AddOption
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from SCons.Util import is_List, flatten_sequence
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class NinjaExperimentalWarning(SCons.Warnings.WarningOnByDefault):
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pass
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def ninja_add_command_line_options():
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"""
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Add additional command line arguments to SCons specific to the ninja tool
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"""
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AddOption('--disable-execute-ninja',
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dest='disable_execute_ninja',
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metavar='BOOL',
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action="store_true",
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default=False,
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help='Disable automatically running ninja after scons')
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AddOption('--disable-ninja',
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dest='disable_ninja',
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metavar='BOOL',
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action="store_true",
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default=False,
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help='Disable ninja generation and build with scons even if tool is loaded. '+
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'Also used by ninja to build targets which only scons can build.')
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AddOption('--skip-ninja-regen',
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dest='skip_ninja_regen',
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metavar='BOOL',
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action="store_true",
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default=False,
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help='Allow scons to skip regeneration of the ninja file and restarting of the daemon. ' +
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'Care should be taken in cases where Glob is in use or SCons generated files are used in ' +
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'command lines.')
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def is_valid_dependent_node(node):
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"""
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Return True if node is not an alias or is an alias that has children
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This prevents us from making phony targets that depend on other
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phony targets that will never have an associated ninja build
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target.
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We also have to specify that it's an alias when doing the builder
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check because some nodes (like src files) won't have builders but
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are valid implicit dependencies.
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"""
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if isinstance(node, SCons.Node.Alias.Alias):
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return node.children()
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return not node.get_env().get("NINJA_SKIP")
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def alias_to_ninja_build(node):
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"""Convert an Alias node into a Ninja phony target"""
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return {
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"outputs": get_outputs(node),
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"rule": "phony",
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"implicit": [
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get_path(src_file(n)) for n in node.children() if is_valid_dependent_node(n)
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],
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}
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def check_invalid_ninja_node(node):
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return not isinstance(node, (SCons.Node.FS.Base, SCons.Node.Alias.Alias))
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def filter_ninja_nodes(node_list):
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ninja_nodes = []
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for node in node_list:
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if isinstance(node, (SCons.Node.FS.Base, SCons.Node.Alias.Alias)) and not node.get_env().get('NINJA_SKIP'):
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ninja_nodes.append(node)
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else:
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continue
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return ninja_nodes
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def get_input_nodes(node):
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if node.get_executor() is not None:
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inputs = node.get_executor().get_all_sources()
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else:
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inputs = node.sources
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return inputs
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def invalid_ninja_nodes(node, targets):
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result = False
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for node_list in [node.prerequisites, get_input_nodes(node), node.children(), targets]:
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if node_list:
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result = result or any([check_invalid_ninja_node(node) for node in node_list])
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return result
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def get_order_only(node):
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"""Return a list of order only dependencies for node."""
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if node.prerequisites is None:
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return []
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return [get_path(src_file(prereq)) for prereq in filter_ninja_nodes(node.prerequisites)]
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def get_dependencies(node, skip_sources=False):
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"""Return a list of dependencies for node."""
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if skip_sources:
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return [
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get_path(src_file(child))
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for child in filter_ninja_nodes(node.children())
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if child not in node.sources
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]
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return [get_path(src_file(child)) for child in filter_ninja_nodes(node.children())]
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def get_inputs(node):
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"""Collect the Ninja inputs for node."""
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return [get_path(src_file(o)) for o in filter_ninja_nodes(get_input_nodes(node))]
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def get_outputs(node):
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"""Collect the Ninja outputs for node."""
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executor = node.get_executor()
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if executor is not None:
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outputs = executor.get_all_targets()
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else:
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if hasattr(node, "target_peers"):
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outputs = node.target_peers
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else:
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outputs = [node]
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outputs = [get_path(o) for o in filter_ninja_nodes(outputs)]
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return outputs
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def get_targets_sources(node):
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executor = node.get_executor()
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if executor is not None:
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tlist = executor.get_all_targets()
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slist = executor.get_all_sources()
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else:
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if hasattr(node, "target_peers"):
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tlist = node.target_peers
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else:
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tlist = [node]
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slist = node.sources
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# Retrieve the repository file for all sources
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slist = [rfile(s) for s in slist]
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return tlist, slist
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def get_path(node):
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"""
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Return a fake path if necessary.
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As an example Aliases use this as their target name in Ninja.
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"""
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if hasattr(node, "get_path"):
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return node.get_path()
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return str(node)
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def rfile(node):
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"""
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Return the repository file for node if it has one. Otherwise return node
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"""
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if hasattr(node, "rfile"):
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return node.rfile()
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return node
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def src_file(node):
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"""Returns the src code file if it exists."""
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if hasattr(node, "srcnode"):
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src = node.srcnode()
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if src.stat() is not None:
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return src
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return get_path(node)
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def get_rule(node, rule):
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tlist, slist = get_targets_sources(node)
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if invalid_ninja_nodes(node, tlist):
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return "TEMPLATE"
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else:
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return rule
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def to_escaped_list(env, lst):
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"""
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Ninja tool function for returning an escaped list of strings from a subst
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generator.
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env_var arg can be a list or a subst generator which returns a list.
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"""
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# subst_list will take in either a raw list or a subst callable which generates
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# a list, and return a list of CmdStringHolders which can be converted into raw strings.
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# If a raw list was passed in, then scons_list will make a list of lists from the original
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# values and even subst items in the list if they are substitutable. Flatten will flatten
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# the list in that case, to ensure for either input we have a list of CmdStringHolders.
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deps_list = env.Flatten(env.subst_list(lst))
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# Now that we have the deps in a list as CmdStringHolders, we can convert them into raw strings
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# and make sure to escape the strings to handle spaces in paths. We also will sort the result
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# keep the order of the list consistent.
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return sorted([dep.escape(env.get("ESCAPE", lambda x: x)) for dep in deps_list])
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def generate_depfile(env, node, dependencies):
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"""
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Ninja tool function for writing a depfile. The depfile should include
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the node path followed by all the dependent files in a makefile format.
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dependencies arg can be a list or a subst generator which returns a list.
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"""
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depfile = os.path.join(get_path(env['NINJA_DIR']), str(node) + '.depfile')
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depfile_contents = str(node) + ": " + ' '.join(to_escaped_list(env, dependencies))
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need_rewrite = False
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try:
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with open(depfile, 'r') as f:
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need_rewrite = (f.read() != depfile_contents)
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except FileNotFoundError:
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need_rewrite = True
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if need_rewrite:
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os.makedirs(os.path.dirname(depfile) or '.', exist_ok=True)
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with open(depfile, 'w') as f:
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f.write(depfile_contents)
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def ninja_noop(*_args, **_kwargs):
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"""
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A general purpose no-op function.
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There are many things that happen in SCons that we don't need and
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also don't return anything. We use this to disable those functions
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instead of creating multiple definitions of the same thing.
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"""
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return None
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def ninja_recursive_sorted_dict(build):
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sorted_dict = OrderedDict()
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for key, val in sorted(build.items()):
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if isinstance(val, dict):
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sorted_dict[key] = ninja_recursive_sorted_dict(val)
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else:
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sorted_dict[key] = val
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return sorted_dict
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def ninja_sorted_build(ninja, **build):
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sorted_dict = ninja_recursive_sorted_dict(build)
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ninja.build(**sorted_dict)
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def get_command_env(env, target, source):
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"""
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Return a string that sets the environment for any environment variables that
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differ between the OS environment and the SCons command ENV.
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It will be compatible with the default shell of the operating system.
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"""
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try:
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return env["NINJA_ENV_VAR_CACHE"]
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except KeyError:
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pass
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# Scan the ENV looking for any keys which do not exist in
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# os.environ or differ from it. We assume if it's a new or
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# differing key from the process environment then it's
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# important to pass down to commands in the Ninja file.
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ENV = SCons.Action._resolve_shell_env(env, target, source)
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scons_specified_env = {
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key: value
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for key, value in ENV.items()
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# TODO: Remove this filter, unless there's a good reason to keep. SCons's behavior shouldn't depend on shell's.
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if key not in os.environ or os.environ.get(key, None) != value
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}
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windows = env["PLATFORM"] == "win32"
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command_env = ""
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scons_specified_env = SCons.Util.sanitize_shell_env(scons_specified_env)
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for key, value in scons_specified_env.items():
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if windows:
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command_env += "set '{}={}' && ".format(key, value)
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else:
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# We address here *only* the specific case that a user might have
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# an environment variable which somehow gets included and has
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# spaces in the value. These are escapes that Ninja handles. This
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# doesn't make builds on paths with spaces (Ninja and SCons issues)
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# nor expanding response file paths with spaces (Ninja issue) work.
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value = value.replace(r' ', r'$ ')
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command_env += "export {}='{}';".format(key, value)
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env["NINJA_ENV_VAR_CACHE"] = command_env
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return command_env
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def get_comstr(env, action, targets, sources):
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"""Get the un-substituted string for action."""
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# Despite being having "list" in it's name this member is not
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# actually a list. It's the pre-subst'd string of the command. We
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# use it to determine if the command we're about to generate needs
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# to use a custom Ninja rule. By default this redirects CC, CXX,
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# AR, SHLINK, and LINK commands to their respective rules but the
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# user can inject custom Ninja rules and tie them to commands by
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# using their pre-subst'd string.
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if hasattr(action, "process"):
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return action.cmd_list
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return action.genstring(targets, sources, env)
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def generate_command(env, node, action, targets, sources, executor=None):
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# Actions like CommandAction have a method called process that is
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# used by SCons to generate the cmd_line they need to run. So
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# check if it's a thing like CommandAction and call it if we can.
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if hasattr(action, "process"):
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cmd_list, _, _ = action.process(targets, sources, env, executor=executor)
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cmd = _string_from_cmd_list(cmd_list[0])
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else:
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# Anything else works with genstring, this is most commonly hit by
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# ListActions which essentially call process on all of their
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# commands and concatenate it for us.
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genstring = action.genstring(targets, sources, env)
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if executor is not None:
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cmd = env.subst(genstring, executor=executor)
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else:
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cmd = env.subst(genstring, targets, sources)
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cmd = cmd.replace("\n", " && ").strip()
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if cmd.endswith("&&"):
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cmd = cmd[0:-2].strip()
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# Escape dollars as necessary
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return cmd.replace("$", "$$")
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def ninja_csig(original):
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"""Return a dummy csig"""
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def wrapper(self):
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if isinstance(self, SCons.Node.Node) and self.is_sconscript():
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return original(self)
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return "dummy_ninja_csig"
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return wrapper
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def ninja_contents(original):
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"""Return a dummy content without doing IO"""
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def wrapper(self):
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if isinstance(self, SCons.Node.Node) and (self.is_sconscript() or self.is_conftest()):
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return original(self)
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return bytes("dummy_ninja_contents", encoding="utf-8")
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return wrapper
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def ninja_stat(_self, path):
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"""
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Eternally memoized stat call.
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SCons is very aggressive about clearing out cached values. For our
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purposes everything should only ever call stat once since we're
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running in a no_exec build the file system state should not
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change. For these reasons we patch SCons.Node.FS.LocalFS.stat to
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use our eternal memoized dictionary.
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"""
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try:
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return SCons.Tool.ninja.Globals.NINJA_STAT_MEMO[path]
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except KeyError:
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try:
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result = os.stat(path)
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except os.error:
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result = None
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SCons.Tool.ninja.Globals.NINJA_STAT_MEMO[path] = result
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return result
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def ninja_whereis(thing, *_args, **_kwargs):
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"""Replace env.WhereIs with a much faster version"""
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# Optimize for success, this gets called significantly more often
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# when the value is already memoized than when it's not.
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try:
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return SCons.Tool.ninja.Globals.NINJA_WHEREIS_MEMO[thing]
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except KeyError:
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# TODO: Fix this to respect env['ENV']['PATH']... WPD
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# We do not honor any env['ENV'] or env[*] variables in the
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# generated ninja file. Ninja passes your raw shell environment
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# down to it's subprocess so the only sane option is to do the
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# same during generation. At some point, if and when we try to
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# upstream this, I'm sure a sticking point will be respecting
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# env['ENV'] variables and such but it's actually quite
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# complicated. I have a naive version but making it always work
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# with shell quoting is nigh impossible. So I've decided to
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# cross that bridge when it's absolutely required.
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path = shutil.which(thing)
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SCons.Tool.ninja.Globals.NINJA_WHEREIS_MEMO[thing] = path
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return path
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def ninja_print_conf_log(s, target, source, env):
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"""Command line print only for conftest to generate a correct conf log."""
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if target and target[0].is_conftest():
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action = SCons.Action._ActionAction()
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action.print_cmd_line(s, target, source, env)
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