mirror of https://gitlab.com/ita1024/waf.git
138 lines
3.3 KiB
Python
138 lines
3.3 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Christoph Koke, 2013
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# Alibek Omarov, 2019
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"""
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Writes the c and cpp compile commands into build/compile_commands.json
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see http://clang.llvm.org/docs/JSONCompilationDatabase.html
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Usage:
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Load this tool in `options` to be able to generate database
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by request in command-line and before build:
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$ waf clangdb
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def options(opt):
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opt.load('clang_compilation_database')
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Otherwise, load only in `configure` to generate it always before build.
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def configure(conf):
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conf.load('compiler_cxx')
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...
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conf.load('clang_compilation_database')
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"""
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import os
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from waflib import Logs, TaskGen, Task, Build, Scripting
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Task.Task.keep_last_cmd = True
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@TaskGen.feature('c', 'cxx')
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@TaskGen.after_method('process_use')
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def collect_compilation_db_tasks(self):
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"Add a compilation database entry for compiled tasks"
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if not isinstance(self.bld, ClangDbContext):
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return
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tup = tuple(y for y in [Task.classes.get(x) for x in ('c', 'cxx')] if y)
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for task in getattr(self, 'compiled_tasks', []):
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if isinstance(task, tup):
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self.bld.clang_compilation_database_tasks.append(task)
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class ClangDbContext(Build.BuildContext):
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'''generates compile_commands.json by request'''
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cmd = 'clangdb'
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clang_compilation_database_tasks = []
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def write_compilation_database(self):
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"""
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Write the clang compilation database as JSON
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"""
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database_file = self.bldnode.make_node('compile_commands.json')
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Logs.info('Build commands will be stored in %s', database_file.path_from(self.path))
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try:
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root = database_file.read_json()
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except IOError:
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root = []
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clang_db = dict((x['file'], x) for x in root)
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for task in self.clang_compilation_database_tasks:
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try:
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cmd = task.last_cmd
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except AttributeError:
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continue
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directory = getattr(task, 'cwd', self.variant_dir)
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f_node = task.inputs[0]
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filename = os.path.relpath(f_node.abspath(), directory)
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entry = {
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"directory": directory,
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"arguments": cmd,
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"file": filename,
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}
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clang_db[filename] = entry
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root = list(clang_db.values())
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database_file.write_json(root)
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def execute(self):
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"""
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Build dry run
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"""
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self.restore()
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if not self.all_envs:
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self.load_envs()
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self.recurse([self.run_dir])
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self.pre_build()
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# we need only to generate last_cmd, so override
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# exec_command temporarily
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def exec_command(self, *k, **kw):
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return 0
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for g in self.groups:
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for tg in g:
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try:
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f = tg.post
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except AttributeError:
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pass
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else:
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f()
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if isinstance(tg, Task.Task):
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lst = [tg]
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else: lst = tg.tasks
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for tsk in lst:
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tup = tuple(y for y in [Task.classes.get(x) for x in ('c', 'cxx')] if y)
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if isinstance(tsk, tup):
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old_exec = tsk.exec_command
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tsk.exec_command = exec_command
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tsk.run()
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tsk.exec_command = old_exec
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self.write_compilation_database()
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EXECUTE_PATCHED = False
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def patch_execute():
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global EXECUTE_PATCHED
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if EXECUTE_PATCHED:
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return
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def new_execute_build(self):
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"""
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Invoke clangdb command before build
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"""
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if type(self) == Build.BuildContext:
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Scripting.run_command('clangdb')
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old_execute_build(self)
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old_execute_build = getattr(Build.BuildContext, 'execute_build', None)
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setattr(Build.BuildContext, 'execute_build', new_execute_build)
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EXECUTE_PATCHED = True
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patch_execute()
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