1 files changed, 137 insertions, 0 deletions
diff --git a/third_party/waf/waflib/extras/clang_compilation_database.py b/third_party/waf/waflib/extras/clang_compilation_database.py
new file mode 100644
index 0000000..bd29db9
--- /dev/null
+++ b/third_party/waf/waflib/extras/clang_compilation_database.py
@@ -0,0 +1,137 @@
+#!/usr/bin/env python
+# encoding: utf-8
+# Christoph Koke, 2013
+# Alibek Omarov, 2019
+
+"""
+Writes the c and cpp compile commands into build/compile_commands.json
+see http://clang.llvm.org/docs/JSONCompilationDatabase.html
+
+Usage:
+
+	Load this tool in `options` to be able to generate database
+	by request in command-line and before build:
+
+	$ waf clangdb
+
+	def options(opt):
+		opt.load('clang_compilation_database')
+
+	Otherwise, load only in `configure` to generate it always before build.
+
+	def configure(conf):
+		conf.load('compiler_cxx')
+		...
+		conf.load('clang_compilation_database')
+"""
+
+from waflib import Logs, TaskGen, Task, Build, Scripting
+
+Task.Task.keep_last_cmd = True
+
+class ClangDbContext(Build.BuildContext):
+	'''generates compile_commands.json by request'''
+	cmd = 'clangdb'
+
+	def write_compilation_database(self):
+		"""
+		Write the clang compilation database as JSON
+		"""
+		database_file = self.bldnode.make_node('compile_commands.json')
+		Logs.info('Build commands will be stored in %s', database_file.path_from(self.path))
+		try:
+			root = database_file.read_json()
+		except IOError:
+			root = []
+		clang_db = dict((x['file'], x) for x in root)
+		for task in self.clang_compilation_database_tasks:
+			try:
+				cmd = task.last_cmd
+			except AttributeError:
+				continue
+			f_node = task.inputs[0]
+			filename = f_node.path_from(task.get_cwd())
+			entry = {
+				"directory": task.get_cwd().abspath(),
+				"arguments": cmd,
+				"file": filename,
+			}
+			clang_db[filename] = entry
+		root = list(clang_db.values())
+		database_file.write_json(root)
+
+	def execute(self):
+		"""
+		Build dry run
+		"""
+		self.restore()
+		self.cur_tasks = []
+		self.clang_compilation_database_tasks = []
+
+		if not self.all_envs:
+			self.load_envs()
+
+		self.recurse([self.run_dir])
+		self.pre_build()
+
+		# we need only to generate last_cmd, so override
+		# exec_command temporarily
+		def exec_command(self, *k, **kw):
+			return 0
+
+		for g in self.groups:
+			for tg in g:
+				try:
+					f = tg.post
+				except AttributeError:
+					pass
+				else:
+					f()
+
+				if isinstance(tg, Task.Task):
+					lst = [tg]
+				else: lst = tg.tasks
+				for tsk in lst:
+					if tsk.__class__.__name__ == "swig":
+						tsk.runnable_status()
+						if hasattr(tsk, 'more_tasks'):
+							lst.extend(tsk.more_tasks)
+					# Not all dynamic tasks can be processed, in some cases
+					# one may have to call the method "run()" like this:
+					#elif tsk.__class__.__name__ == 'src2c':
+					#	tsk.run()
+					#	if hasattr(tsk, 'more_tasks'):
+					#		lst.extend(tsk.more_tasks)
+
+					tup = tuple(y for y in [Task.classes.get(x) for x in ('c', 'cxx')] if y)
+					if isinstance(tsk, tup):
+						self.clang_compilation_database_tasks.append(tsk)
+						tsk.nocache = True
+						old_exec = tsk.exec_command
+						tsk.exec_command = exec_command
+						tsk.run()
+						tsk.exec_command = old_exec
+
+		self.write_compilation_database()
+
+EXECUTE_PATCHED = False
+def patch_execute():
+	global EXECUTE_PATCHED
+
+	if EXECUTE_PATCHED:
+		return
+
+	def new_execute_build(self):
+		"""
+		Invoke clangdb command before build
+		"""
+		if self.cmd.startswith('build'):
+			Scripting.run_command(self.cmd.replace('build','clangdb'))
+
+		old_execute_build(self)
+
+	old_execute_build = getattr(Build.BuildContext, 'execute_build', None)
+	setattr(Build.BuildContext, 'execute_build', new_execute_build)
+	EXECUTE_PATCHED = True
+
+patch_execute()