# Copyright 2019 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.

# This class contains the basic functionality needed to run any interpreter
# or an interpreter-based tool.
from __future__ import annotations

from functools import lru_cache
from os import environ
from pathlib import Path
import re
import typing as T

from .common import CMakeException, CMakeTarget, language_map, cmake_get_generator_args, check_cmake_args
from .fileapi import CMakeFileAPI
from .executor import CMakeExecutor
from .toolchain import CMakeToolchain, CMakeExecScope
from .traceparser import CMakeTraceParser
from .tracetargets import resolve_cmake_trace_targets
from .. import mlog, mesonlib
from ..mesonlib import MachineChoice, OrderedSet, path_is_in_root, relative_to_if_possible, OptionKey
from ..mesondata import DataFile
from ..compilers.compilers import assembler_suffixes, lang_suffixes, header_suffixes, obj_suffixes, lib_suffixes, is_header
from ..programs import ExternalProgram
from ..coredata import FORBIDDEN_TARGET_NAMES
from ..mparser import (
    Token,
    BaseNode,
    CodeBlockNode,
    FunctionNode,
    ArrayNode,
    ArgumentNode,
    AssignmentNode,
    BooleanNode,
    StringNode,
    IdNode,
    IndexNode,
    MethodNode,
    NumberNode,
)


if T.TYPE_CHECKING:
    from .common import CMakeConfiguration, TargetOptions
    from .traceparser import CMakeGeneratorTarget
    from .._typing import ImmutableListProtocol
    from ..build import Build
    from ..backend.backends import Backend
    from ..environment import Environment

TYPE_mixed = T.Union[str, int, bool, Path, BaseNode]
TYPE_mixed_list = T.Union[TYPE_mixed, T.Sequence[TYPE_mixed]]
TYPE_mixed_kwargs = T.Dict[str, TYPE_mixed_list]

# Disable all warnings automatically enabled with --trace and friends
# See https://cmake.org/cmake/help/latest/variable/CMAKE_POLICY_WARNING_CMPNNNN.html
disable_policy_warnings = [
    'CMP0025',
    'CMP0047',
    'CMP0056',
    'CMP0060',
    'CMP0065',
    'CMP0066',
    'CMP0067',
    'CMP0082',
    'CMP0089',
    'CMP0102',
]

target_type_map = {
    'STATIC_LIBRARY': 'static_library',
    'MODULE_LIBRARY': 'shared_module',
    'SHARED_LIBRARY': 'shared_library',
    'EXECUTABLE': 'executable',
    'OBJECT_LIBRARY': 'static_library',
    'INTERFACE_LIBRARY': 'header_only'
}

skip_targets = ['UTILITY']

blacklist_compiler_flags = [
    '-Wall', '-Wextra', '-Weverything', '-Werror', '-Wpedantic', '-pedantic', '-w',
    '/W1', '/W2', '/W3', '/W4', '/Wall', '/WX', '/w',
    '/O1', '/O2', '/Ob', '/Od', '/Og', '/Oi', '/Os', '/Ot', '/Ox', '/Oy', '/Ob0',
    '/RTC1', '/RTCc', '/RTCs', '/RTCu',
    '/Z7', '/Zi', '/ZI',
]

blacklist_link_flags = [
    '/machine:x64', '/machine:x86', '/machine:arm', '/machine:ebc',
    '/debug', '/debug:fastlink', '/debug:full', '/debug:none',
    '/incremental',
]

blacklist_clang_cl_link_flags = ['/GR', '/EHsc', '/MDd', '/Zi', '/RTC1']

blacklist_link_libs = [
    'kernel32.lib',
    'user32.lib',
    'gdi32.lib',
    'winspool.lib',
    'shell32.lib',
    'ole32.lib',
    'oleaut32.lib',
    'uuid.lib',
    'comdlg32.lib',
    'advapi32.lib'
]

transfer_dependencies_from = ['header_only']

_cmake_name_regex = re.compile(r'[^_a-zA-Z0-9]')
def _sanitize_cmake_name(name: str) -> str:
    name = _cmake_name_regex.sub('_', name)
    if name in FORBIDDEN_TARGET_NAMES or name.startswith('meson'):
        name = 'cm_' + name
    return name

class OutputTargetMap:
    rm_so_version = re.compile(r'(\.[0-9]+)+$')

    def __init__(self, build_dir: Path):
        self.tgt_map = {}          # type: T.Dict[str, T.Union['ConverterTarget', 'ConverterCustomTarget']]
        self.build_dir = build_dir

    def add(self, tgt: T.Union['ConverterTarget', 'ConverterCustomTarget']) -> None:
        def assign_keys(keys: T.List[str]) -> None:
            for i in [x for x in keys if x]:
                self.tgt_map[i] = tgt
        keys = [self._target_key(tgt.cmake_name)]
        if isinstance(tgt, ConverterTarget):
            keys += [tgt.full_name]
            keys += [self._rel_artifact_key(x) for x in tgt.artifacts]
            keys += [self._base_artifact_key(x) for x in tgt.artifacts]
        if isinstance(tgt, ConverterCustomTarget):
            keys += [self._rel_generated_file_key(x) for x in tgt.original_outputs]
            keys += [self._base_generated_file_key(x) for x in tgt.original_outputs]
        assign_keys(keys)

    def _return_first_valid_key(self, keys: T.List[str]) -> T.Optional[T.Union['ConverterTarget', 'ConverterCustomTarget']]:
        for i in keys:
            if i and i in self.tgt_map:
                return self.tgt_map[i]
        return None

    def target(self, name: str) -> T.Optional[T.Union['ConverterTarget', 'ConverterCustomTarget']]:
        return self._return_first_valid_key([self._target_key(name)])

    def executable(self, name: str) -> T.Optional['ConverterTarget']:
        tgt = self.target(name)
        if tgt is None or not isinstance(tgt, ConverterTarget):
            return None
        if tgt.meson_func() != 'executable':
            return None
        return tgt

    def artifact(self, name: str) -> T.Optional[T.Union['ConverterTarget', 'ConverterCustomTarget']]:
        keys = []
        candidates = [name, OutputTargetMap.rm_so_version.sub('', name)]
        for i in lib_suffixes:
            if not name.endswith('.' + i):
                continue
            new_name = name[:-len(i) - 1]
            new_name = OutputTargetMap.rm_so_version.sub('', new_name)
            candidates += [f'{new_name}.{i}']
        for i in candidates:
            keys += [self._rel_artifact_key(Path(i)), Path(i).name, self._base_artifact_key(Path(i))]
        return self._return_first_valid_key(keys)

    def generated(self, name: Path) -> T.Optional['ConverterCustomTarget']:
        res = self._return_first_valid_key([self._rel_generated_file_key(name), self._base_generated_file_key(name)])
        assert res is None or isinstance(res, ConverterCustomTarget)
        return res

    # Utility functions to generate local keys
    def _rel_path(self, fname: Path) -> T.Optional[Path]:
        try:
            return fname.resolve().relative_to(self.build_dir)
        except ValueError:
            pass
        return None

    def _target_key(self, tgt_name: str) -> str:
        return f'__tgt_{tgt_name}__'

    def _rel_generated_file_key(self, fname: Path) -> T.Optional[str]:
        path = self._rel_path(fname)
        return f'__relgen_{path.as_posix()}__' if path else None

    def _base_generated_file_key(self, fname: Path) -> str:
        return f'__gen_{fname.name}__'

    def _rel_artifact_key(self, fname: Path) -> T.Optional[str]:
        path = self._rel_path(fname)
        return f'__relart_{path.as_posix()}__' if path else None

    def _base_artifact_key(self, fname: Path) -> str:
        return f'__art_{fname.name}__'

class ConverterTarget:
    def __init__(self, target: CMakeTarget, env: 'Environment', for_machine: MachineChoice) -> None:
        self.env = env
        self.for_machine = for_machine
        self.artifacts = target.artifacts
        self.src_dir = target.src_dir
        self.build_dir = target.build_dir
        self.name = target.name
        self.cmake_name = target.name
        self.full_name = target.full_name
        self.type = target.type
        self.install = target.install
        self.install_dir = None  # type: T.Optional[Path]
        self.link_libraries = target.link_libraries
        self.link_flags = target.link_flags + target.link_lang_flags
        self.depends_raw = []   # type: T.List[str]
        self.depends = []       # type: T.List[T.Union[ConverterTarget, ConverterCustomTarget]]

        if target.install_paths:
            self.install_dir = target.install_paths[0]

        self.languages = set()          # type: T.Set[str]
        self.sources = []               # type: T.List[Path]
        self.generated = []             # type: T.List[Path]
        self.generated_ctgt = []        # type: T.List[CustomTargetReference]
        self.includes = []              # type: T.List[Path]
        self.sys_includes = []          # type: T.List[Path]
        self.link_with = []             # type: T.List[T.Union[ConverterTarget, ConverterCustomTarget]]
        self.object_libs = []           # type: T.List[ConverterTarget]
        self.compile_opts = {}          # type: T.Dict[str, T.List[str]]
        self.public_compile_opts = []   # type: T.List[str]
        self.pie = False

        # Project default override options (c_std, cpp_std, etc.)
        self.override_options = []  # type: T.List[str]

        # Convert the target name to a valid meson target name
        self.name = _sanitize_cmake_name(self.name)

        self.generated_raw = []     # type: T.List[Path]

        for i in target.files:
            languages = set()       # type: T.Set[str]
            src_suffixes = set()    # type: T.Set[str]

            # Insert suffixes
            for j in i.sources:
                if not j.suffix:
                    continue
                src_suffixes.add(j.suffix[1:])

            # Determine the meson language(s)
            # Extract the default language from the explicit CMake field
            lang_cmake_to_meson = {val.lower(): key for key, val in language_map.items()}
            languages.add(lang_cmake_to_meson.get(i.language.lower(), 'c'))

            # Determine missing languages from the source suffixes
            for sfx in src_suffixes:
                for key, val in lang_suffixes.items():
                    if sfx in val:
                        languages.add(key)
                        break

            # Register the new languages and initialize the compile opts array
            for lang in languages:
                self.languages.add(lang)
                if lang not in self.compile_opts:
                    self.compile_opts[lang] = []

            # Add arguments, but avoid duplicates
            args = i.flags
            args += [f'-D{x}' for x in i.defines]
            for lang in languages:
                self.compile_opts[lang] += [x for x in args if x not in self.compile_opts[lang]]

            # Handle include directories
            self.includes += [x.path for x in i.includes if x.path not in self.includes and not x.isSystem]
            self.sys_includes += [x.path for x in i.includes if x.path not in self.sys_includes and x.isSystem]

            # Add sources to the right array
            if i.is_generated:
                self.generated_raw += i.sources
            else:
                self.sources += i.sources

    def __repr__(self) -> str:
        return f'<{self.__class__.__name__}: {self.name}>'

    std_regex = re.compile(r'([-]{1,2}std=|/std:v?|[-]{1,2}std:)(.*)')

    def postprocess(self, output_target_map: OutputTargetMap, root_src_dir: Path, subdir: Path, install_prefix: Path, trace: CMakeTraceParser) -> None:
        # Detect setting the C and C++ standard and do additional compiler args manipulation
        for i in ['c', 'cpp']:
            if i not in self.compile_opts:
                continue

            temp = []
            for j in self.compile_opts[i]:
                m = ConverterTarget.std_regex.match(j)
                ctgt = output_target_map.generated(Path(j))
                if m:
                    std = m.group(2)
                    supported = self._all_lang_stds(i)
                    if std not in supported:
                        mlog.warning(
                            'Unknown {0}_std "{1}" -> Ignoring. Try setting the project-'
                            'level {0}_std if build errors occur. Known '
                            '{0}_stds are: {2}'.format(i, std, ' '.join(supported)),
                            once=True
                        )
                        continue
                    self.override_options += [f'{i}_std={std}']
                elif j in ['-fPIC', '-fpic', '-fPIE', '-fpie']:
                    self.pie = True
                elif isinstance(ctgt, ConverterCustomTarget):
                    # Sometimes projects pass generated source files as compiler
                    # flags. Add these as generated sources to ensure that the
                    # corresponding custom target is run.2
                    self.generated_raw += [Path(j)]
                    temp += [j]
                elif j in blacklist_compiler_flags:
                    pass
                else:
                    temp += [j]

            self.compile_opts[i] = temp

        # Make sure to force enable -fPIC for OBJECT libraries
        if self.type.upper() == 'OBJECT_LIBRARY':
            self.pie = True

        # Use the CMake trace, if required
        tgt = trace.targets.get(self.cmake_name)
        if tgt:
            self.depends_raw = trace.targets[self.cmake_name].depends

            rtgt = resolve_cmake_trace_targets(self.cmake_name, trace, self.env)
            self.includes += [Path(x) for x in rtgt.include_directories]
            self.link_flags += rtgt.link_flags
            self.public_compile_opts += rtgt.public_compile_opts
            self.link_libraries += rtgt.libraries

        elif self.type.upper() not in ['EXECUTABLE', 'OBJECT_LIBRARY']:
            mlog.warning('CMake: Target', mlog.bold(self.cmake_name), 'not found in CMake trace. This can lead to build errors')

        temp = []
        for i in self.link_libraries:
            # Let meson handle this arcane magic
            if ',-rpath,' in i:
                continue
            if not Path(i).is_absolute():
                link_with = output_target_map.artifact(i)
                if link_with:
                    self.link_with += [link_with]
                    continue

            temp += [i]
        self.link_libraries = temp

        # Filter out files that are not supported by the language
        supported = list(assembler_suffixes) + list(header_suffixes) + list(obj_suffixes)
        for i in self.languages:
            supported += list(lang_suffixes[i])
        supported = [f'.{x}' for x in supported]
        self.sources = [x for x in self.sources if any(x.name.endswith(y) for y in supported)]
        self.generated_raw = [x for x in self.generated_raw if any(x.name.endswith(y) for y in supported)]

        # Make paths relative
        def rel_path(x: Path, is_header: bool, is_generated: bool) -> T.Optional[Path]:
            if not x.is_absolute():
                x = self.src_dir / x
            x = x.resolve()
            assert x.is_absolute()
            if not x.exists() and not any(x.name.endswith(y) for y in obj_suffixes) and not is_generated:
                if path_is_in_root(x, Path(self.env.get_build_dir()), resolve=True):
                    x.mkdir(parents=True, exist_ok=True)
                    return x.relative_to(Path(self.env.get_build_dir()) / subdir)
                else:
                    mlog.warning('CMake: path', mlog.bold(x.as_posix()), 'does not exist.')
                    mlog.warning(' --> Ignoring. This can lead to build errors.')
                    return None
            if x in trace.explicit_headers:
                return None
            if (
                    path_is_in_root(x, Path(self.env.get_source_dir()))
                    and not (
                        path_is_in_root(x, root_src_dir) or
                        path_is_in_root(x, Path(self.env.get_build_dir()))
                    )
                    ):
                mlog.warning('CMake: path', mlog.bold(x.as_posix()), 'is inside the root project but', mlog.bold('not'), 'inside the subproject.')
                mlog.warning(' --> Ignoring. This can lead to build errors.')
                return None
            if path_is_in_root(x, Path(self.env.get_build_dir())) and is_header:
                return x.relative_to(Path(self.env.get_build_dir()) / subdir)
            if path_is_in_root(x, root_src_dir):
                return x.relative_to(root_src_dir)
            return x

        build_dir_rel = self.build_dir.relative_to(Path(self.env.get_build_dir()) / subdir)
        self.generated_raw = [rel_path(x, False, True) for x in self.generated_raw]
        self.includes = list(OrderedSet([rel_path(x, True, False) for x in OrderedSet(self.includes)] + [build_dir_rel]))
        self.sys_includes = list(OrderedSet([rel_path(x, True, False) for x in OrderedSet(self.sys_includes)]))
        self.sources = [rel_path(x, False, False) for x in self.sources]

        # Resolve custom targets
        for gen_file in self.generated_raw:
            ctgt = output_target_map.generated(gen_file)
            if ctgt:
                assert isinstance(ctgt, ConverterCustomTarget)
                ref = ctgt.get_ref(gen_file)
                assert isinstance(ref, CustomTargetReference) and ref.valid()
                self.generated_ctgt += [ref]
            elif gen_file is not None:
                self.generated += [gen_file]

        # Remove delete entries
        self.includes = [x for x in self.includes if x is not None]
        self.sys_includes = [x for x in self.sys_includes if x is not None]
        self.sources = [x for x in self.sources if x is not None]

        # Make sure '.' is always in the include directories
        if Path('.') not in self.includes:
            self.includes += [Path('.')]

        # make install dir relative to the install prefix
        if self.install_dir and self.install_dir.is_absolute():
            if path_is_in_root(self.install_dir, install_prefix):
                self.install_dir = self.install_dir.relative_to(install_prefix)

        # Remove blacklisted options and libs
        def check_flag(flag: str) -> bool:
            if flag.lower() in blacklist_link_flags or flag in blacklist_compiler_flags + blacklist_clang_cl_link_flags:
                return False
            if flag.startswith('/D'):
                return False
            return True

        self.link_libraries = [x for x in self.link_libraries if x.lower() not in blacklist_link_libs]
        self.link_flags = [x for x in self.link_flags if check_flag(x)]

        # Handle OSX frameworks
        def handle_frameworks(flags: T.List[str]) -> T.List[str]:
            res: T.List[str] = []
            for i in flags:
                p = Path(i)
                if not p.exists() or not p.name.endswith('.framework'):
                    res += [i]
                    continue
                res += ['-framework', p.stem]
            return res

        self.link_libraries = handle_frameworks(self.link_libraries)
        self.link_flags = handle_frameworks(self.link_flags)

        # Handle explicit CMake add_dependency() calls
        for i in self.depends_raw:
            dep_tgt = output_target_map.target(i)
            if dep_tgt:
                self.depends.append(dep_tgt)

    def process_object_libs(self, obj_target_list: T.List['ConverterTarget'], linker_workaround: bool) -> None:
        # Try to detect the object library(s) from the generated input sources
        temp = [x for x in self.generated if any(x.name.endswith('.' + y) for y in obj_suffixes)]
        stem = [x.stem for x in temp]
        exts = self._all_source_suffixes()
        # Temp now stores the source filenames of the object files
        for i in obj_target_list:
            source_files = [x.name for x in i.sources + i.generated]
            for j in stem:
                # On some platforms (specifically looking at you Windows with vs20xy backend) CMake does
                # not produce object files with the format `foo.cpp.obj`, instead it skipps the language
                # suffix and just produces object files like `foo.obj`. Thus we have to do our best to
                # undo this step and guess the correct language suffix of the object file. This is done
                # by trying all language suffixes meson knows and checking if one of them fits.
                candidates = [j]  # type: T.List[str]
                if not any(j.endswith('.' + x) for x in exts):
                    mlog.warning('Object files do not contain source file extensions, thus falling back to guessing them.', once=True)
                    candidates += [f'{j}.{x}' for x in exts]
                if any(x in source_files for x in candidates):
                    if linker_workaround:
                        self._append_objlib_sources(i)
                    else:
                        self.includes += i.includes
                        self.includes = list(OrderedSet(self.includes))
                        self.object_libs += [i]
                    break

        # Filter out object files from the sources
        self.generated = [x for x in self.generated if not any(x.name.endswith('.' + y) for y in obj_suffixes)]

    def _append_objlib_sources(self, tgt: 'ConverterTarget') -> None:
        self.includes += tgt.includes
        self.sources += tgt.sources
        self.generated += tgt.generated
        self.generated_ctgt += tgt.generated_ctgt
        self.includes = list(OrderedSet(self.includes))
        self.sources = list(OrderedSet(self.sources))
        self.generated = list(OrderedSet(self.generated))
        self.generated_ctgt = list(OrderedSet(self.generated_ctgt))

        # Inherit compiler arguments since they may be required for building
        for lang, opts in tgt.compile_opts.items():
            if lang not in self.compile_opts:
                self.compile_opts[lang] = []
            self.compile_opts[lang] += [x for x in opts if x not in self.compile_opts[lang]]

    @lru_cache(maxsize=None)
    def _all_source_suffixes(self) -> 'ImmutableListProtocol[str]':
        suffixes = []  # type: T.List[str]
        for exts in lang_suffixes.values():
            suffixes.extend(exts)
        return suffixes

    @lru_cache(maxsize=None)
    def _all_lang_stds(self, lang: str) -> 'ImmutableListProtocol[str]':
        try:
            res = self.env.coredata.options[OptionKey('std', machine=MachineChoice.BUILD, lang=lang)].choices
        except KeyError:
            return []

        # TODO: Get rid of this once we have proper typing for options
        assert isinstance(res, list)
        for i in res:
            assert isinstance(i, str)

        return res

    def process_inter_target_dependencies(self) -> None:
        # Move the dependencies from all transfer_dependencies_from to the target
        to_process = list(self.depends)
        processed = []
        new_deps = []
        for i in to_process:
            processed += [i]
            if isinstance(i, ConverterTarget) and i.meson_func() in transfer_dependencies_from:
                to_process += [x for x in i.depends if x not in processed]
            else:
                new_deps += [i]
        self.depends = list(OrderedSet(new_deps))

    def cleanup_dependencies(self) -> None:
        # Clear the dependencies from targets that where moved from
        if self.meson_func() in transfer_dependencies_from:
            self.depends = []

    def meson_func(self) -> str:
        return target_type_map.get(self.type.upper())

    def log(self) -> None:
        mlog.log('Target', mlog.bold(self.name), f'({self.cmake_name})')
        mlog.log('  -- artifacts:      ', mlog.bold(str(self.artifacts)))
        mlog.log('  -- full_name:      ', mlog.bold(self.full_name))
        mlog.log('  -- type:           ', mlog.bold(self.type))
        mlog.log('  -- install:        ', mlog.bold('true' if self.install else 'false'))
        mlog.log('  -- install_dir:    ', mlog.bold(self.install_dir.as_posix() if self.install_dir else ''))
        mlog.log('  -- link_libraries: ', mlog.bold(str(self.link_libraries)))
        mlog.log('  -- link_with:      ', mlog.bold(str(self.link_with)))
        mlog.log('  -- object_libs:    ', mlog.bold(str(self.object_libs)))
        mlog.log('  -- link_flags:     ', mlog.bold(str(self.link_flags)))
        mlog.log('  -- languages:      ', mlog.bold(str(self.languages)))
        mlog.log('  -- includes:       ', mlog.bold(str(self.includes)))
        mlog.log('  -- sys_includes:   ', mlog.bold(str(self.sys_includes)))
        mlog.log('  -- sources:        ', mlog.bold(str(self.sources)))
        mlog.log('  -- generated:      ', mlog.bold(str(self.generated)))
        mlog.log('  -- generated_ctgt: ', mlog.bold(str(self.generated_ctgt)))
        mlog.log('  -- pie:            ', mlog.bold('true' if self.pie else 'false'))
        mlog.log('  -- override_opts:  ', mlog.bold(str(self.override_options)))
        mlog.log('  -- depends:        ', mlog.bold(str(self.depends)))
        mlog.log('  -- options:')
        for key, val in self.compile_opts.items():
            mlog.log('    -', key, '=', mlog.bold(str(val)))

class CustomTargetReference:
    def __init__(self, ctgt: 'ConverterCustomTarget', index: int) -> None:
        self.ctgt = ctgt    # type: ConverterCustomTarget
        self.index = index  # type: int

    def __repr__(self) -> str:
        if self.valid():
            return '<{}: {} [{}]>'.format(self.__class__.__name__, self.ctgt.name, self.ctgt.outputs[self.index])
        else:
            return f'<{self.__class__.__name__}: INVALID REFERENCE>'

    def valid(self) -> bool:
        return self.ctgt is not None and self.index >= 0

    def filename(self) -> str:
        return self.ctgt.outputs[self.index]

class ConverterCustomTarget:
    tgt_counter = 0  # type: int
    out_counter = 0  # type: int

    def __init__(self, target: CMakeGeneratorTarget, env: 'Environment', for_machine: MachineChoice) -> None:
        assert target.current_bin_dir is not None
        assert target.current_src_dir is not None
        self.name = target.name
        if not self.name:
            self.name = f'custom_tgt_{ConverterCustomTarget.tgt_counter}'
            ConverterCustomTarget.tgt_counter += 1
        self.cmake_name = str(self.name)
        self.original_outputs = list(target.outputs)
        self.outputs = [x.name for x in self.original_outputs]
        self.conflict_map = {}                          # type: T.Dict[str, str]
        self.command = []                               # type: T.List[T.List[T.Union[str, ConverterTarget]]]
        self.working_dir = target.working_dir
        self.depends_raw = target.depends
        self.inputs = []                                # type: T.List[T.Union[str, CustomTargetReference]]
        self.depends = []                               # type: T.List[T.Union[ConverterTarget, ConverterCustomTarget]]
        self.current_bin_dir = target.current_bin_dir   # type: Path
        self.current_src_dir = target.current_src_dir   # type: Path
        self.env = env
        self.for_machine = for_machine
        self._raw_target = target

        # Convert the target name to a valid meson target name
        self.name = _sanitize_cmake_name(self.name)

    def __repr__(self) -> str:
        return f'<{self.__class__.__name__}: {self.name} {self.outputs}>'

    def postprocess(self, output_target_map: OutputTargetMap, root_src_dir: Path, all_outputs: T.List[str], trace: CMakeTraceParser) -> None:
        # Default the working directory to ${CMAKE_CURRENT_BINARY_DIR}
        if self.working_dir is None:
            self.working_dir = self.current_bin_dir

        # relative paths in the working directory are always relative
        # to ${CMAKE_CURRENT_BINARY_DIR}
        if not self.working_dir.is_absolute():
            self.working_dir = self.current_bin_dir / self.working_dir

        # Modify the original outputs if they are relative. Again,
        # relative paths are relative to ${CMAKE_CURRENT_BINARY_DIR}
        def ensure_absolute(x: Path) -> Path:
            if x.is_absolute():
                return x
            else:
                return self.current_bin_dir / x
        self.original_outputs = [ensure_absolute(x) for x in self.original_outputs]

        # Ensure that there is no duplicate output in the project so
        # that meson can handle cases where the same filename is
        # generated in multiple directories
        temp_outputs = []  # type: T.List[str]
        for i in self.outputs:
            if i in all_outputs:
                old = str(i)
                i = f'c{ConverterCustomTarget.out_counter}_{i}'
                ConverterCustomTarget.out_counter += 1
                self.conflict_map[old] = i
            all_outputs += [i]
            temp_outputs += [i]
        self.outputs = temp_outputs

        # Check if the command is a build target
        commands = []  # type: T.List[T.List[T.Union[str, ConverterTarget]]]
        for curr_cmd in self._raw_target.command:
            assert isinstance(curr_cmd, list)
            assert curr_cmd[0] != '', "An empty string is not a valid executable"
            cmd = []  # type: T.List[T.Union[str, ConverterTarget]]

            for j in curr_cmd:
                if not j:
                    continue
                target = output_target_map.executable(j)
                if target:
                    # When cross compiling, binaries have to be executed with an exe_wrapper (for instance wine for mingw-w64)
                    if self.env.exe_wrapper is not None and self.env.properties[self.for_machine].get_cmake_use_exe_wrapper():
                        assert isinstance(self.env.exe_wrapper, ExternalProgram)
                        cmd += self.env.exe_wrapper.get_command()
                    cmd += [target]
                    continue
                elif j in trace.targets:
                    trace_tgt = trace.targets[j]
                    if trace_tgt.type == 'EXECUTABLE' and 'IMPORTED_LOCATION' in trace_tgt.properties:
                        cmd += trace_tgt.properties['IMPORTED_LOCATION']
                        continue
                    mlog.debug(f'CMake: Found invalid CMake target "{j}" --> ignoring \n{trace_tgt}')

                # Fallthrough on error
                cmd += [j]

            commands += [cmd]
        self.command = commands

        # If the custom target does not declare any output, create a dummy
        # one that can be used as dependency.
        if not self.outputs:
            self.outputs = [self.name + '.h']

        # Check dependencies and input files
        for i in self.depends_raw:
            if not i:
                continue
            raw = Path(i)
            art = output_target_map.artifact(i)
            tgt = output_target_map.target(i)
            gen = output_target_map.generated(raw)

            rel_to_root = None
            try:
                rel_to_root = raw.relative_to(root_src_dir)
            except ValueError:
                rel_to_root = None

            # First check for existing files. Only then check for existing
            # targets, etc. This reduces the chance of misdetecting input files
            # as outputs from other targets.
            # See https://github.com/mesonbuild/meson/issues/6632
            if not raw.is_absolute() and (self.current_src_dir / raw).is_file():
                self.inputs += [(self.current_src_dir / raw).relative_to(root_src_dir).as_posix()]
            elif raw.is_absolute() and raw.exists() and rel_to_root is not None:
                self.inputs += [rel_to_root.as_posix()]
            elif art:
                self.depends += [art]
            elif tgt:
                self.depends += [tgt]
            elif gen:
                ctgt_ref = gen.get_ref(raw)
                assert ctgt_ref is not None
                self.inputs += [ctgt_ref]

    def process_inter_target_dependencies(self) -> None:
        # Move the dependencies from all transfer_dependencies_from to the target
        to_process = list(self.depends)
        processed = []
        new_deps = []
        for i in to_process:
            processed += [i]
            if isinstance(i, ConverterTarget) and i.meson_func() in transfer_dependencies_from:
                to_process += [x for x in i.depends if x not in processed]
            else:
                new_deps += [i]
        self.depends = list(OrderedSet(new_deps))

    def get_ref(self, fname: Path) -> T.Optional[CustomTargetReference]:
        name = fname.name
        try:
            if name in self.conflict_map:
                name = self.conflict_map[name]
            idx = self.outputs.index(name)
            return CustomTargetReference(self, idx)
        except ValueError:
            return None

    def log(self) -> None:
        mlog.log('Custom Target', mlog.bold(self.name), f'({self.cmake_name})')
        mlog.log('  -- command:      ', mlog.bold(str(self.command)))
        mlog.log('  -- outputs:      ', mlog.bold(str(self.outputs)))
        mlog.log('  -- conflict_map: ', mlog.bold(str(self.conflict_map)))
        mlog.log('  -- working_dir:  ', mlog.bold(str(self.working_dir)))
        mlog.log('  -- depends_raw:  ', mlog.bold(str(self.depends_raw)))
        mlog.log('  -- inputs:       ', mlog.bold(str(self.inputs)))
        mlog.log('  -- depends:      ', mlog.bold(str(self.depends)))

class CMakeInterpreter:
    def __init__(self, build: 'Build', subdir: Path, src_dir: Path, install_prefix: Path, env: 'Environment', backend: 'Backend'):
        self.build = build
        self.subdir = subdir
        self.src_dir = src_dir
        self.build_dir_rel = subdir / '__CMake_build'
        self.build_dir = Path(env.get_build_dir()) / self.build_dir_rel
        self.install_prefix = install_prefix
        self.env = env
        self.for_machine = MachineChoice.HOST # TODO make parameter
        self.backend_name = backend.name
        self.linkers = set()  # type: T.Set[str]
        self.fileapi = CMakeFileAPI(self.build_dir)

        # Raw CMake results
        self.bs_files = []    # type: T.List[Path]
        self.codemodel_configs = None  # type: T.Optional[T.List[CMakeConfiguration]]
        self.cmake_stderr = None  # type: T.Optional[str]

        # Analysed data
        self.project_name = ''
        self.languages = []  # type: T.List[str]
        self.targets = []  # type: T.List[ConverterTarget]
        self.custom_targets = []  # type: T.List[ConverterCustomTarget]
        self.trace: CMakeTraceParser
        self.output_target_map = OutputTargetMap(self.build_dir)

        # Generated meson data
        self.generated_targets = {}  # type: T.Dict[str, T.Dict[str, T.Optional[str]]]
        self.internal_name_map = {}  # type: T.Dict[str, str]

        # Do some special handling for object libraries for certain configurations
        self._object_lib_workaround = False
        if self.backend_name.startswith('vs'):
            for comp in self.env.coredata.compilers[self.for_machine].values():
                if comp.get_linker_id() == 'link':
                    self._object_lib_workaround = True
                    break

    def configure(self, extra_cmake_options: T.List[str]) -> CMakeExecutor:
        # Find CMake
        # TODO: Using MachineChoice.BUILD should always be correct here, but also evaluate the use of self.for_machine
        cmake_exe = CMakeExecutor(self.env, '>=3.14', MachineChoice.BUILD)
        if not cmake_exe.found():
            raise CMakeException('Unable to find CMake')
        self.trace = CMakeTraceParser(cmake_exe.version(), self.build_dir, self.env, permissive=True)

        preload_file = DataFile('cmake/data/preload.cmake').write_to_private(self.env)
        toolchain = CMakeToolchain(cmake_exe, self.env, self.for_machine, CMakeExecScope.SUBPROJECT, self.build_dir, preload_file)
        toolchain_file = toolchain.write()

        # TODO: drop this check once the deprecated `cmake_args` kwarg is removed
        extra_cmake_options = check_cmake_args(extra_cmake_options)

        cmake_args = []
        cmake_args += cmake_get_generator_args(self.env)
        cmake_args += [f'-DCMAKE_INSTALL_PREFIX={self.install_prefix}']
        cmake_args += extra_cmake_options
        trace_args = self.trace.trace_args()
        cmcmp_args = [f'-DCMAKE_POLICY_WARNING_{x}=OFF' for x in disable_policy_warnings]

        self.fileapi.setup_request()

        # Run CMake
        mlog.log()
        with mlog.nested():
            mlog.log('Configuring the build directory with', mlog.bold('CMake'), 'version', mlog.cyan(cmake_exe.version()))
            mlog.log(mlog.bold('Running CMake with:'), ' '.join(cmake_args))
            mlog.log(mlog.bold('  - build directory:         '), self.build_dir.as_posix())
            mlog.log(mlog.bold('  - source directory:        '), self.src_dir.as_posix())
            mlog.log(mlog.bold('  - toolchain file:          '), toolchain_file.as_posix())
            mlog.log(mlog.bold('  - preload file:            '), preload_file.as_posix())
            mlog.log(mlog.bold('  - trace args:              '), ' '.join(trace_args))
            mlog.log(mlog.bold('  - disabled policy warnings:'), '[{}]'.format(', '.join(disable_policy_warnings)))
            mlog.log()
            self.build_dir.mkdir(parents=True, exist_ok=True)
            os_env = environ.copy()
            os_env['LC_ALL'] = 'C'
            final_args = cmake_args + trace_args + cmcmp_args + toolchain.get_cmake_args() + [self.src_dir.as_posix()]

            cmake_exe.set_exec_mode(print_cmout=True, always_capture_stderr=self.trace.requires_stderr())
            rc, _, self.cmake_stderr = cmake_exe.call(final_args, self.build_dir, env=os_env, disable_cache=True)

        mlog.log()
        h = mlog.green('SUCCEEDED') if rc == 0 else mlog.red('FAILED')
        mlog.log('CMake configuration:', h)
        if rc != 0:
            # get the last CMake error - We only need the message function for this:
            self.trace.functions = {'message': self.trace.functions['message']}
            self.trace.parse(self.cmake_stderr)
            error = f': {self.trace.errors[-1]}' if self.trace.errors else ''
            raise CMakeException(f'Failed to configure the CMake subproject{error}')

        return cmake_exe

    def initialise(self, extra_cmake_options: T.List[str]) -> None:
        # Configure the CMake project to generate the file API data
        self.configure(extra_cmake_options)

        # Parse the result
        self.fileapi.load_reply()

        # Load the buildsystem file list
        cmake_files = self.fileapi.get_cmake_sources()
        self.bs_files = [x.file for x in cmake_files if not x.is_cmake and not x.is_temp]
        self.bs_files = [relative_to_if_possible(x, Path(self.env.get_source_dir())) for x in self.bs_files]
        self.bs_files = [x for x in self.bs_files if not path_is_in_root(x, Path(self.env.get_build_dir()), resolve=True)]
        self.bs_files = list(OrderedSet(self.bs_files))

        # Load the codemodel configurations
        self.codemodel_configs = self.fileapi.get_cmake_configurations()

    def analyse(self) -> None:
        if self.codemodel_configs is None:
            raise CMakeException('CMakeInterpreter was not initialized')

        # Clear analyser data
        self.project_name = ''
        self.languages = []
        self.targets = []
        self.custom_targets = []

        # Parse the trace
        self.trace.parse(self.cmake_stderr)

        # Find all targets
        added_target_names = []  # type: T.List[str]
        for i_0 in self.codemodel_configs:
            for j_0 in i_0.projects:
                if not self.project_name:
                    self.project_name = j_0.name
                for k_0 in j_0.targets:
                    # Avoid duplicate targets from different configurations and known
                    # dummy CMake internal target types
                    if k_0.type not in skip_targets and k_0.name not in added_target_names:
                        added_target_names += [k_0.name]
                        self.targets += [ConverterTarget(k_0, self.env, self.for_machine)]

        # Add interface targets from trace, if not already present.
        # This step is required because interface targets were removed from
        # the CMake file API output.
        api_target_name_list = [x.name for x in self.targets]
        for i_1 in self.trace.targets.values():
            if i_1.type != 'INTERFACE' or i_1.name in api_target_name_list or i_1.imported:
                continue
            dummy = CMakeTarget({
                'name': i_1.name,
                'type': 'INTERFACE_LIBRARY',
                'sourceDirectory': self.src_dir,
                'buildDirectory': self.build_dir,
            })
            self.targets += [ConverterTarget(dummy, self.env, self.for_machine)]

        for i_2 in self.trace.custom_targets:
            self.custom_targets += [ConverterCustomTarget(i_2, self.env, self.for_machine)]

        # generate the output_target_map
        for i_3 in [*self.targets, *self.custom_targets]:
            assert isinstance(i_3, (ConverterTarget, ConverterCustomTarget))
            self.output_target_map.add(i_3)

        # First pass: Basic target cleanup
        object_libs = []
        custom_target_outputs = []  # type: T.List[str]
        for ctgt in self.custom_targets:
            ctgt.postprocess(self.output_target_map, self.src_dir, custom_target_outputs, self.trace)
        for tgt in self.targets:
            tgt.postprocess(self.output_target_map, self.src_dir, self.subdir, self.install_prefix, self.trace)
            if tgt.type == 'OBJECT_LIBRARY':
                object_libs += [tgt]
            self.languages += [x for x in tgt.languages if x not in self.languages]

        # Second pass: Detect object library dependencies
        for tgt in self.targets:
            tgt.process_object_libs(object_libs, self._object_lib_workaround)

        # Third pass: Reassign dependencies to avoid some loops
        for tgt in self.targets:
            tgt.process_inter_target_dependencies()
        for ctgt in self.custom_targets:
            ctgt.process_inter_target_dependencies()

        # Fourth pass: Remove rassigned dependencies
        for tgt in self.targets:
            tgt.cleanup_dependencies()

        mlog.log('CMake project', mlog.bold(self.project_name), 'has', mlog.bold(str(len(self.targets) + len(self.custom_targets))), 'build targets.')

    def pretend_to_be_meson(self, options: TargetOptions) -> CodeBlockNode:
        if not self.project_name:
            raise CMakeException('CMakeInterpreter was not analysed')

        def token(tid: str = 'string', val: TYPE_mixed = '') -> Token:
            return Token(tid, self.subdir.as_posix(), 0, 0, 0, None, val)

        def string(value: str) -> StringNode:
            return StringNode(token(val=value))

        def id_node(value: str) -> IdNode:
            return IdNode(token(val=value))

        def number(value: int) -> NumberNode:
            return NumberNode(token(val=value))

        def nodeify(value: TYPE_mixed_list) -> BaseNode:
            if isinstance(value, str):
                return string(value)
            if isinstance(value, Path):
                return string(value.as_posix())
            elif isinstance(value, bool):
                return BooleanNode(token(val=value))
            elif isinstance(value, int):
                return number(value)
            elif isinstance(value, list):
                return array(value)
            elif isinstance(value, BaseNode):
                return value
            raise RuntimeError('invalid type of value: {} ({})'.format(type(value).__name__, str(value)))

        def indexed(node: BaseNode, index: int) -> IndexNode:
            return IndexNode(node, nodeify(index))

        def array(elements: TYPE_mixed_list) -> ArrayNode:
            args = ArgumentNode(token())
            if not isinstance(elements, list):
                elements = [args]
            args.arguments += [nodeify(x) for x in elements if x is not None]
            return ArrayNode(args, 0, 0, 0, 0)

        def function(name: str, args: T.Optional[TYPE_mixed_list] = None, kwargs: T.Optional[TYPE_mixed_kwargs] = None) -> FunctionNode:
            args = [] if args is None else args
            kwargs = {} if kwargs is None else kwargs
            args_n = ArgumentNode(token())
            if not isinstance(args, list):
                assert isinstance(args, (str, int, bool, Path, BaseNode))
                args = [args]
            args_n.arguments = [nodeify(x) for x in args if x is not None]
            args_n.kwargs = {id_node(k): nodeify(v) for k, v in kwargs.items() if v is not None}
            func_n = FunctionNode(self.subdir.as_posix(), 0, 0, 0, 0, name, args_n)
            return func_n

        def method(obj: BaseNode, name: str, args: T.Optional[TYPE_mixed_list] = None, kwargs: T.Optional[TYPE_mixed_kwargs] = None) -> MethodNode:
            args = [] if args is None else args
            kwargs = {} if kwargs is None else kwargs
            args_n = ArgumentNode(token())
            if not isinstance(args, list):
                assert isinstance(args, (str, int, bool, Path, BaseNode))
                args = [args]
            args_n.arguments = [nodeify(x) for x in args if x is not None]
            args_n.kwargs = {id_node(k): nodeify(v) for k, v in kwargs.items() if v is not None}
            return MethodNode(self.subdir.as_posix(), 0, 0, obj, name, args_n)

        def assign(var_name: str, value: BaseNode) -> AssignmentNode:
            return AssignmentNode(self.subdir.as_posix(), 0, 0, var_name, value)

        # Generate the root code block and the project function call
        root_cb = CodeBlockNode(token())
        root_cb.lines += [function('project', [self.project_name] + self.languages)]

        # Add the run script for custom commands

        # Add the targets
        processing = []   # type: T.List[str]
        processed = {}   # type: T.Dict[str, T.Dict[str, T.Optional[str]]]
        name_map = {}   # type: T.Dict[str, str]

        def extract_tgt(tgt: T.Union[ConverterTarget, ConverterCustomTarget, CustomTargetReference]) -> IdNode:
            tgt_name = None
            if isinstance(tgt, (ConverterTarget, ConverterCustomTarget)):
                tgt_name = tgt.name
            elif isinstance(tgt, CustomTargetReference):
                tgt_name = tgt.ctgt.name
            assert tgt_name is not None and tgt_name in processed
            res_var = processed[tgt_name]['tgt']
            return id_node(res_var) if res_var else None

        def detect_cycle(tgt: T.Union[ConverterTarget, ConverterCustomTarget]) -> None:
            if tgt.name in processing:
                raise CMakeException('Cycle in CMake inputs/dependencies detected')
            processing.append(tgt.name)

        def resolve_ctgt_ref(ref: CustomTargetReference) -> T.Union[IdNode, IndexNode]:
            tgt_var = extract_tgt(ref)
            if len(ref.ctgt.outputs) == 1:
                return tgt_var
            else:
                return indexed(tgt_var, ref.index)

        def process_target(tgt: ConverterTarget) -> None:
            detect_cycle(tgt)

            # First handle inter target dependencies
            link_with = []              # type: T.List[IdNode]
            objec_libs = []             # type: T.List[IdNode]
            sources = []                # type: T.List[Path]
            generated = []              # type: T.List[T.Union[IdNode, IndexNode]]
            generated_filenames = []    # type: T.List[str]
            custom_targets = []         # type: T.List[ConverterCustomTarget]
            dependencies = []           # type: T.List[IdNode]
            for i in tgt.link_with:
                assert isinstance(i, ConverterTarget)
                if i.name not in processed:
                    process_target(i)
                link_with += [extract_tgt(i)]
            for i in tgt.object_libs:
                assert isinstance(i, ConverterTarget)
                if i.name not in processed:
                    process_target(i)
                objec_libs += [extract_tgt(i)]
            for i in tgt.depends:
                if not isinstance(i, ConverterCustomTarget):
                    continue
                if i.name not in processed:
                    process_custom_target(i)
                dependencies += [extract_tgt(i)]

            # Generate the source list and handle generated sources
            sources += tgt.sources
            sources += tgt.generated

            for ctgt_ref in tgt.generated_ctgt:
                ctgt = ctgt_ref.ctgt
                if ctgt.name not in processed:
                    process_custom_target(ctgt)
                generated += [resolve_ctgt_ref(ctgt_ref)]
                generated_filenames += [ctgt_ref.filename()]
                if ctgt not in custom_targets:
                    custom_targets += [ctgt]

            # Add all header files from all used custom targets. This
            # ensures that all custom targets are built before any
            # sources of the current target are compiled and thus all
            # header files are present. This step is necessary because
            # CMake always ensures that a custom target is executed
            # before another target if at least one output is used.
            for ctgt in custom_targets:
                for j in ctgt.outputs:
                    if not is_header(j) or j in generated_filenames:
                        continue

                    generated += [resolve_ctgt_ref(ctgt.get_ref(Path(j)))]
                    generated_filenames += [j]

            # Determine the meson function to use for the build target
            tgt_func = tgt.meson_func()
            if not tgt_func:
                raise CMakeException(f'Unknown target type "{tgt.type}"')

            # Determine the variable names
            inc_var = f'{tgt.name}_inc'
            dir_var = f'{tgt.name}_dir'
            sys_var = f'{tgt.name}_sys'
            src_var = f'{tgt.name}_src'
            dep_var = f'{tgt.name}_dep'
            tgt_var = tgt.name

            install_tgt = options.get_install(tgt.cmake_name, tgt.install)

            # Generate target kwargs
            tgt_kwargs = {
                'build_by_default': install_tgt,
                'link_args': options.get_link_args(tgt.cmake_name, tgt.link_flags + tgt.link_libraries),
                'link_with': link_with,
                'include_directories': id_node(inc_var),
                'install': install_tgt,
                'override_options': options.get_override_options(tgt.cmake_name, tgt.override_options),
                'objects': [method(x, 'extract_all_objects') for x in objec_libs],
            }  # type: TYPE_mixed_kwargs

            # Only set if installed and only override if it is set
            if install_tgt and tgt.install_dir:
                tgt_kwargs['install_dir'] = tgt.install_dir

            # Handle compiler args
            for key, val in tgt.compile_opts.items():
                tgt_kwargs[f'{key}_args'] = options.get_compile_args(tgt.cmake_name, key, val)

            # Handle -fPCI, etc
            if tgt_func == 'executable':
                tgt_kwargs['pie'] = tgt.pie
            elif tgt_func == 'static_library':
                tgt_kwargs['pic'] = tgt.pie

            # declare_dependency kwargs
            dep_kwargs = {
                'link_args': tgt.link_flags + tgt.link_libraries,
                'link_with': id_node(tgt_var),
                'compile_args': tgt.public_compile_opts,
                'include_directories': id_node(inc_var),
            }  # type: TYPE_mixed_kwargs

            if dependencies:
                generated += dependencies

            # Generate the function nodes
            dir_node = assign(dir_var, function('include_directories', tgt.includes))
            sys_node = assign(sys_var, function('include_directories', tgt.sys_includes, {'is_system': True}))
            inc_node = assign(inc_var, array([id_node(dir_var), id_node(sys_var)]))
            node_list = [dir_node, sys_node, inc_node]
            if tgt_func == 'header_only':
                del dep_kwargs['link_with']
                dep_node = assign(dep_var, function('declare_dependency', kwargs=dep_kwargs))
                node_list += [dep_node]
                src_var = None
                tgt_var = None
            else:
                src_node = assign(src_var, function('files', sources))
                tgt_node = assign(tgt_var, function(tgt_func, [tgt_var, id_node(src_var), *generated], tgt_kwargs))
                node_list += [src_node, tgt_node]
                if tgt_func in ['static_library', 'shared_library']:
                    dep_node = assign(dep_var, function('declare_dependency', kwargs=dep_kwargs))
                    node_list += [dep_node]
                elif tgt_func in ['shared_module']:
                    del dep_kwargs['link_with']
                    dep_node = assign(dep_var, function('declare_dependency', kwargs=dep_kwargs))
                    node_list += [dep_node]
                else:
                    dep_var = None

            # Add the nodes to the ast
            root_cb.lines += node_list
            processed[tgt.name] = {'inc': inc_var, 'src': src_var, 'dep': dep_var, 'tgt': tgt_var, 'func': tgt_func}
            name_map[tgt.cmake_name] = tgt.name

        def process_custom_target(tgt: ConverterCustomTarget) -> None:
            # CMake allows to specify multiple commands in a custom target.
            # To map this to meson, a helper script is used to execute all
            # commands in order. This additionally allows setting the working
            # directory.

            detect_cycle(tgt)
            tgt_var = tgt.name  # type: str

            def resolve_source(x: T.Union[str, ConverterTarget, ConverterCustomTarget, CustomTargetReference]) -> T.Union[str, IdNode, IndexNode]:
                if isinstance(x, ConverterTarget):
                    if x.name not in processed:
                        process_target(x)
                    return extract_tgt(x)
                if isinstance(x, ConverterCustomTarget):
                    if x.name not in processed:
                        process_custom_target(x)
                    return extract_tgt(x)
                elif isinstance(x, CustomTargetReference):
                    if x.ctgt.name not in processed:
                        process_custom_target(x.ctgt)
                    return resolve_ctgt_ref(x)
                else:
                    return x

            # Generate the command list
            command = []  # type: T.List[T.Union[str, IdNode, IndexNode]]
            command += mesonlib.get_meson_command()
            command += ['--internal', 'cmake_run_ctgt']
            command += ['-o', '@OUTPUT@']
            if tgt.original_outputs:
                command += ['-O'] + [x.as_posix() for x in tgt.original_outputs]
            command += ['-d', tgt.working_dir.as_posix()]

            # Generate the commands. Subcommands are separated by ';;;'
            for cmd in tgt.command:
                command += [resolve_source(x) for x in cmd] + [';;;']

            tgt_kwargs = {
                'input': [resolve_source(x) for x in tgt.inputs],
                'output': tgt.outputs,
                'command': command,
                'depends': [resolve_source(x) for x in tgt.depends],
            }  # type: TYPE_mixed_kwargs

            root_cb.lines += [assign(tgt_var, function('custom_target', [tgt.name], tgt_kwargs))]
            processed[tgt.name] = {'inc': None, 'src': None, 'dep': None, 'tgt': tgt_var, 'func': 'custom_target'}
            name_map[tgt.cmake_name] = tgt.name

        # Now generate the target function calls
        for ctgt in self.custom_targets:
            if ctgt.name not in processed:
                process_custom_target(ctgt)
        for tgt in self.targets:
            if tgt.name not in processed:
                process_target(tgt)

        self.generated_targets = processed
        self.internal_name_map = name_map
        return root_cb

    def target_info(self, target: str) -> T.Optional[T.Dict[str, str]]:
        # Try resolving the target name
        # start by checking if there is a 100% match (excluding the name prefix)
        prx_tgt = _sanitize_cmake_name(target)
        if prx_tgt in self.generated_targets:
            return self.generated_targets[prx_tgt]
        # check if there exists a name mapping
        if target in self.internal_name_map:
            target = self.internal_name_map[target]
            assert target in self.generated_targets
            return self.generated_targets[target]
        return None

    def target_list(self) -> T.List[str]:
        return list(self.internal_name_map.keys())