meson/backends.py

# Copyright 2012-2014 The Meson development team

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os, pickle
import build
import dependencies
import mesonlib
from coredata import MesonException

class TestSerialisation:
    def __init__(self, name, fname, is_cross, exe_wrapper, is_parallel, cmd_args, env,
                 should_fail, valgrind_args, timeout, extra_paths):
        self.name = name
        self.fname = fname
        self.is_cross = is_cross
        self.exe_runner = exe_wrapper
        self.is_parallel = is_parallel
        self.cmd_args = cmd_args
        self.env = env
        self.should_fail = should_fail
        self.valgrind_args = valgrind_args
        self.timeout = timeout
        self.extra_paths = extra_paths

# This class contains the basic functionality that is needed by all backends.
# Feel free to move stuff in and out of it as you see fit.
class Backend():
    def __init__(self, build, interp):
        self.build = build
        self.environment = build.environment
        self.interpreter = interp
        self.processed_targets = {}
        self.dep_rules = {}
        self.build_to_src = os.path.relpath(self.environment.get_source_dir(),
                                            self.environment.get_build_dir())

    def get_compiler_for_lang(self, lang):
        for i in self.build.compilers:
            if i.language == lang:
                return i
        raise RuntimeError('No compiler for language ' + lang)

    def get_compiler_for_source(self, src):
        for i in self.build.compilers:
            if i.can_compile(src):
                return i
        if isinstance(src, mesonlib.File):
            src = src.fname
        raise RuntimeError('No specified compiler can handle file ' + src)

    def get_target_filename(self, target):
        targetdir = self.get_target_dir(target)
        fname = target.get_filename()
        if isinstance(fname, list):
            fname = fname[0] # HORROR, HORROR! Fix this.
        filename = os.path.join(targetdir, fname)
        return filename

    def get_target_dir(self, target):
        dirname = target.get_subdir()
        os.makedirs(os.path.join(self.environment.get_build_dir(), dirname), exist_ok=True)
        return dirname

    def get_target_private_dir(self, target):
        dirname = os.path.join(self.get_target_dir(target), target.get_basename() + target.type_suffix())
        os.makedirs(os.path.join(self.environment.get_build_dir(), dirname), exist_ok=True)
        return dirname

    def generate_unity_files(self, target, unity_src):
        langlist = {}
        abs_files = []
        result = []
        for src in unity_src:
            comp = self.get_compiler_for_source(src)
            language = comp.get_language()
            suffix = '.' + comp.get_default_suffix()
            if language not in langlist:
                outfilename = os.path.join(self.get_target_private_dir(target), target.name + '-unity' + suffix)
                outfileabs = os.path.join(self.environment.get_build_dir(), outfilename)
                outfileabs_tmp = outfileabs + '.tmp'
                abs_files.append(outfileabs)
                outfile = open(outfileabs_tmp, 'w')
                langlist[language] = outfile
                result.append(outfilename)
            ofile = langlist[language]
            ofile.write('#include<%s>\n' % src)
        [x.close() for x in langlist.values()]
        [mesonlib.replace_if_different(x, x + '.tmp') for x in abs_files]
        return result

    def relpath(self, todir, fromdir):
        return os.path.relpath(os.path.join('dummyprefixdir', todir),\
                               os.path.join('dummyprefixdir', fromdir))

    def flatten_object_list(self, target, proj_dir_to_build_root=''):
        obj_list = []
        for obj in target.get_objects():
            if isinstance(obj, str):
                o = os.path.join(proj_dir_to_build_root,
                                 self.build_to_src, target.get_subdir(), obj)
                obj_list.append(o)
            elif isinstance(obj, build.ExtractedObjects):
                obj_list += self.determine_ext_objs(obj, proj_dir_to_build_root)
            else:
                raise MesonException('Unknown data type in object list.')
        return obj_list

    def serialise_tests(self):
        test_data = os.path.join(self.environment.get_scratch_dir(), 'meson_test_setup.dat')
        datafile = open(test_data, 'wb')
        self.write_test_file(datafile)
        datafile.close()

    def has_vala(self, target):
        for s in target.get_sources():
            if s.endswith('.vala'):
                return True
        return False

    def has_rust(self, target):
        for s in target.get_sources():
            if s.endswith('.rs'):
                return True
        return False

    def has_cs(self, target):
        for s in target.get_sources():
            if s.endswith('.cs'):
                return True
        return False

    def determine_linker(self, target, src):
        if isinstance(target, build.StaticLibrary):
            return self.build.static_linker
        if len(self.build.compilers) == 1:
            return self.build.compilers[0]
        # Currently a bit naive. C++ must
        # be linked with a C++ compiler, but
        # otherwise we don't care. This will
        # become trickier if and when Fortran
        # and the like become supported.
        cpp = None
        for c in self.build.compilers:
            if c.get_language() == 'cpp':
                cpp = c
                break
        if cpp is not None:
            for s in src:
                if c.can_compile(s):
                    return cpp
        for c in self.build.compilers:
            if c.get_language() != 'vala':
                return c
        raise RuntimeError('Unreachable code')

    def determine_ext_objs(self, extobj, proj_dir_to_build_root=''):
        result = []
        targetdir = self.get_target_private_dir(extobj.target)
        suffix = '.' + self.environment.get_object_suffix()
        for osrc in extobj.srclist:
            osrc_base = osrc.fname
            if not self.source_suffix_in_objs:
                osrc_base = '.'.join(osrc.split('.')[:-1])
            # If extracting in a subproject, the subproject
            # name gets duplicated in the file name.
            pathsegs = osrc.subdir.split(os.sep)
            if pathsegs[0] == 'subprojects':
                pathsegs = pathsegs[2:]
            fixedpath = os.sep.join(pathsegs)
            objbase = osrc.fname.replace('/', '_').replace('\\', '_')
            objname = os.path.join(proj_dir_to_build_root,
                                   targetdir, os.path.basename(objbase) + suffix)
            result.append(objname)
        return result

    def get_pch_include_args(self, compiler, target):
        args = []
        pchpath = self.get_target_private_dir(target)
        includeargs = compiler.get_include_args(pchpath)
        for lang in ['c', 'cpp']:
            p = target.get_pch(lang)
            if len(p) == 0:
                continue
            if compiler.can_compile(p[-1]):
                header = p[0]
                args += compiler.get_pch_use_args(pchpath, header)
        if len(args) > 0:
            args = includeargs + args
        return args

    def generate_basic_compiler_args(self, target, compiler):
        commands = []
        commands += compiler.get_always_args()
        commands += self.build.get_global_args(compiler)
        commands += self.environment.coredata.external_args[compiler.get_language()]
        if self.environment.coredata.buildtype != 'plain':
            commands += compiler.get_std_warn_args()
        commands += target.get_extra_args(compiler.get_language())
        commands += compiler.get_buildtype_args(self.environment.coredata.buildtype)
        if self.environment.coredata.coverage:
            commands += compiler.get_coverage_args()
        if self.environment.coredata.werror:
            commands += compiler.get_werror_args()
        if isinstance(target, build.SharedLibrary):
            commands += compiler.get_pic_args()
        for dep in target.get_external_deps():
            commands += dep.get_compile_args()
            if isinstance(target, build.Executable):
                commands += dep.get_exe_args()

        return commands

    def build_target_link_arguments(self, compiler, deps):
        args = []
        for d in deps:
            if not isinstance(d, build.StaticLibrary) and\
            not isinstance(d, build.SharedLibrary):
                raise RuntimeError('Tried to link with a non-library target "%s".' % d.get_basename())
            fname = self.get_target_filename(d)
            if compiler.id == 'msvc':
                if fname.endswith('dll'):
                    fname = fname[:-3] + 'lib'
            args.append(fname)
            # If you have executable e that links to shared lib s1 that links to shared library s2
            # you have to specify s2 as well as s1 when linking e even if e does not directly use
            # s2. Gcc handles this case fine but Clang does not for some reason. Thus we need to
            # explictly specify all libraries every time.
            args += self.build_target_link_arguments(compiler, d.get_dependencies())
        return args

    def determine_windows_extra_paths(self, target):
        '''On Windows there is no such thing as an rpath.
        We must determine all locations of DLLs that this exe
        links to and return them so they can be used in unit
        tests.'''
        if not isinstance(target, build.Executable):
            print(target)
            return []
        prospectives = target.get_transitive_rpaths()
        return [os.path.join(self.environment.get_build_dir(), i) for i in prospectives if len(i) > 0]

    def write_test_file(self, datafile):
        arr = []
        for t in self.build.get_tests():
            exe = t.get_exe()
            if isinstance(exe, dependencies.ExternalProgram):
                fname = exe.fullpath
            else:
                fname = [os.path.join(self.environment.get_build_dir(), self.get_target_filename(t.get_exe()))]
            is_cross = self.environment.is_cross_build() and self.environment.cross_info.need_cross_compiler()
            if is_cross:
                exe_wrapper = self.environment.cross_info.config['binaries'].get('exe_wrapper', None)
            else:
                exe_wrapper = None
            if mesonlib.is_windows():
                extra_paths = self.determine_windows_extra_paths(exe)
            else:
                extra_paths = []
            ts = TestSerialisation(t.get_name(), fname, is_cross, exe_wrapper,
                                   t.is_parallel, t.cmd_args, t.env, t.should_fail, t.valgrind_args,
                                   t.timeout, extra_paths)
            arr.append(ts)
        pickle.dump(arr, datafile)

    def generate_pkgconfig_files(self):
        for p in self.build.pkgconfig_gens:
            outdir = self.environment.scratch_dir
            fname = os.path.join(outdir, p.filebase + '.pc')
            ofile = open(fname, 'w')
            ofile.write('prefix=%s\n' % self.environment.get_coredata().prefix)
            ofile.write('libdir=${prefix}/%s\n' % self.environment.get_coredata().libdir)
            ofile.write('includedir=${prefix}/%s\n\n' % self.environment.get_coredata().includedir)
            ofile.write('Name: %s\n' % p.name)
            if len(p.description) > 0:
                ofile.write('Description: %s\n' % p.description)
            if len(p.version) > 0:
                ofile.write('Version: %s\n' % p.version)
            ofile.write('Libs: -L${libdir} ')
            for l in p.libraries:
                ofile.write('-l%s ' % l.name)
            ofile.write('\n')
            ofile.write('CFlags: ')
            for h in p.subdirs:
                if h == '.':
                    h = ''
                ofile.write(os.path.join('-I${includedir}', h))
                ofile.write(' ')
            ofile.write('\n')