mirror of
https://gitlab.com/ita1024/waf.git
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263 lines
9.8 KiB
Python
263 lines
9.8 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Copyright Garmin International or its subsidiaries, 2012-2013
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'''
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Off-load dependency scanning from Python code to MSVC compiler
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This tool is safe to load in any environment; it will only activate the
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MSVC exploits when it finds that a particular taskgen uses MSVC to
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compile.
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Empirical testing shows about a 10% execution time savings from using
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this tool as compared to c_preproc.
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The technique of gutting scan() and pushing the dependency calculation
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down to post_run() is cribbed from gccdeps.py.
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'''
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import os
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import sys
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import tempfile
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import threading
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from waflib import Context, Errors, Logs, Task, Utils
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from waflib.Tools import c_preproc, c, cxx, msvc
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from waflib.TaskGen import feature, before_method
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lock = threading.Lock()
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nodes = {} # Cache the path -> Node lookup
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PREPROCESSOR_FLAG = '/showIncludes'
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INCLUDE_PATTERN = 'Note: including file:'
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# Extensible by outside tools
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supported_compilers = ['msvc']
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@feature('c', 'cxx')
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@before_method('process_source')
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def apply_msvcdeps_flags(taskgen):
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if taskgen.env.CC_NAME not in supported_compilers:
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return
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for flag in ('CFLAGS', 'CXXFLAGS'):
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if taskgen.env.get_flat(flag).find(PREPROCESSOR_FLAG) < 0:
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taskgen.env.append_value(flag, PREPROCESSOR_FLAG)
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# Figure out what casing conventions the user's shell used when
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# launching Waf
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(drive, _) = os.path.splitdrive(taskgen.bld.srcnode.abspath())
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taskgen.msvcdeps_drive_lowercase = drive == drive.lower()
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def path_to_node(base_node, path, cached_nodes):
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# Take the base node and the path and return a node
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# Results are cached because searching the node tree is expensive
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# The following code is executed by threads, it is not safe, so a lock is needed...
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if getattr(path, '__hash__'):
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node_lookup_key = (base_node, path)
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else:
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# Not hashable, assume it is a list and join into a string
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node_lookup_key = (base_node, os.path.sep.join(path))
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try:
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lock.acquire()
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node = cached_nodes[node_lookup_key]
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except KeyError:
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node = base_node.find_resource(path)
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cached_nodes[node_lookup_key] = node
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finally:
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lock.release()
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return node
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'''
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Register a task subclass that has hooks for running our custom
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dependency calculations rather than the C/C++ stock c_preproc
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method.
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'''
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def wrap_compiled_task(classname):
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derived_class = type(classname, (Task.classes[classname],), {})
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def post_run(self):
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if self.env.CC_NAME not in supported_compilers:
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return super(derived_class, self).post_run()
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if getattr(self, 'cached', None):
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return Task.Task.post_run(self)
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bld = self.generator.bld
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unresolved_names = []
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resolved_nodes = []
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lowercase = self.generator.msvcdeps_drive_lowercase
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correct_case_path = bld.path.abspath()
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correct_case_path_len = len(correct_case_path)
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correct_case_path_norm = os.path.normcase(correct_case_path)
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# Dynamically bind to the cache
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try:
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cached_nodes = bld.cached_nodes
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except AttributeError:
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cached_nodes = bld.cached_nodes = {}
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for path in self.msvcdeps_paths:
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node = None
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if os.path.isabs(path):
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# Force drive letter to match conventions of main source tree
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drive, tail = os.path.splitdrive(path)
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if os.path.normcase(path[:correct_case_path_len]) == correct_case_path_norm:
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# Path is in the sandbox, force it to be correct. MSVC sometimes returns a lowercase path.
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path = correct_case_path + path[correct_case_path_len:]
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else:
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# Check the drive letter
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if lowercase and (drive != drive.lower()):
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path = drive.lower() + tail
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elif (not lowercase) and (drive != drive.upper()):
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path = drive.upper() + tail
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node = path_to_node(bld.root, path, cached_nodes)
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else:
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base_node = bld.bldnode
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# when calling find_resource, make sure the path does not begin by '..'
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path = [k for k in Utils.split_path(path) if k and k != '.']
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while path[0] == '..':
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path = path[1:]
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base_node = base_node.parent
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node = path_to_node(base_node, path, cached_nodes)
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if not node:
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raise ValueError('could not find %r for %r' % (path, self))
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else:
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if not c_preproc.go_absolute:
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if not (node.is_child_of(bld.srcnode) or node.is_child_of(bld.bldnode)):
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# System library
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Logs.debug('msvcdeps: Ignoring system include %r', node)
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continue
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if id(node) == id(self.inputs[0]):
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# Self-dependency
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continue
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resolved_nodes.append(node)
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bld.node_deps[self.uid()] = resolved_nodes
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bld.raw_deps[self.uid()] = unresolved_names
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try:
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del self.cache_sig
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except AttributeError:
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pass
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Task.Task.post_run(self)
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def scan(self):
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if self.env.CC_NAME not in supported_compilers:
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return super(derived_class, self).scan()
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resolved_nodes = self.generator.bld.node_deps.get(self.uid(), [])
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unresolved_names = []
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return (resolved_nodes, unresolved_names)
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def sig_implicit_deps(self):
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if self.env.CC_NAME not in supported_compilers:
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return super(derived_class, self).sig_implicit_deps()
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try:
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return Task.Task.sig_implicit_deps(self)
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except Errors.WafError:
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return Utils.SIG_NIL
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def exec_response_command(self, cmd, **kw):
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# exec_response_command() is only called from inside msvc.py anyway
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assert self.env.CC_NAME in supported_compilers
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# Only bother adding '/showIncludes' to compile tasks
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if isinstance(self, (c.c, cxx.cxx)):
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try:
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# The Visual Studio IDE adds an environment variable that causes
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# the MS compiler to send its textual output directly to the
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# debugging window rather than normal stdout/stderr.
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#
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# This is unrecoverably bad for this tool because it will cause
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# all the dependency scanning to see an empty stdout stream and
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# assume that the file being compiled uses no headers.
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#
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# See http://blogs.msdn.com/b/freik/archive/2006/04/05/569025.aspx
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#
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# Attempting to repair the situation by deleting the offending
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# envvar at this point in tool execution will not be good enough--
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# its presence poisons the 'waf configure' step earlier. We just
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# want to put a sanity check here in order to help developers
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# quickly diagnose the issue if an otherwise-good Waf tree
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# is then executed inside the MSVS IDE.
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assert 'VS_UNICODE_OUTPUT' not in kw['env']
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tmp = None
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# This block duplicated from Waflib's msvc.py
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if sys.platform.startswith('win') and isinstance(cmd, list) and len(' '.join(cmd)) >= 8192:
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program = cmd[0]
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cmd = [self.quote_response_command(x) for x in cmd]
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(fd, tmp) = tempfile.mkstemp()
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os.write(fd, '\r\n'.join(i.replace('\\', '\\\\') for i in cmd[1:]).encode())
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os.close(fd)
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cmd = [program, '@' + tmp]
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# ... end duplication
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self.msvcdeps_paths = []
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kw['env'] = kw.get('env', os.environ.copy())
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kw['cwd'] = kw.get('cwd', os.getcwd())
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kw['quiet'] = Context.STDOUT
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kw['output'] = Context.STDOUT
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out = []
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try:
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raw_out = self.generator.bld.cmd_and_log(cmd, **kw)
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ret = 0
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except Errors.WafError as e:
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raw_out = e.stdout
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ret = e.returncode
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for line in raw_out.splitlines():
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if line.startswith(INCLUDE_PATTERN):
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inc_path = line[len(INCLUDE_PATTERN):].strip()
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Logs.debug('msvcdeps: Regex matched %s', inc_path)
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self.msvcdeps_paths.append(inc_path)
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else:
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out.append(line)
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# Pipe through the remaining stdout content (not related to /showIncludes)
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if self.generator.bld.logger:
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self.generator.bld.logger.debug('out: %s' % os.linesep.join(out))
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else:
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sys.stdout.write(os.linesep.join(out) + os.linesep)
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finally:
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if tmp:
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try:
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os.remove(tmp)
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except OSError:
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pass
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return ret
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else:
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# Use base class's version of this method for linker tasks
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return super(derived_class, self).exec_response_command(cmd, **kw)
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def can_retrieve_cache(self):
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# msvcdeps and netcaching are incompatible, so disable the cache
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if self.env.CC_NAME not in supported_compilers:
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return super(derived_class, self).can_retrieve_cache()
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self.nocache = True # Disable sending the file to the cache
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return False
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derived_class.post_run = post_run
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derived_class.scan = scan
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derived_class.sig_implicit_deps = sig_implicit_deps
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derived_class.exec_response_command = exec_response_command
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derived_class.can_retrieve_cache = can_retrieve_cache
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for k in ('c', 'cxx'):
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wrap_compiled_task(k)
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