interpreter: Move to its own folder and split it

9 files changed, 2211 insertions, 2129 deletions

diff --git a/mesonbuild/interpreter/__init__.py b/mesonbuild/interpreter/__init__.py
new file mode 100644
index 0000000..e571971
--- /dev/null
+++ b/mesonbuild/interpreter/__init__.py
@@ -0,0 +1,25 @@
+# SPDX-license-identifier: Apache-2.0
+# Copyright 2012-2021 The Meson development team
+# Copyright © 2021 Intel Corporation
+
+# 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.
+
+"""Meson interpreter."""
+
+from .interpreter import Interpreter, permitted_kwargs
+from .compiler import CompilerHolder
+from .interpreterobjects import (ExecutableHolder, BuildTargetHolder, CustomTargetHolder,
+                                 CustomTargetIndexHolder, MachineHolder, Test,
+                                 ConfigurationDataHolder, SubprojectHolder, DependencyHolder,
+                                 GeneratedListHolder, ExternalProgramHolder,
+                                 extract_required_kwarg)
diff --git a/mesonbuild/interpreter/compiler.py b/mesonbuild/interpreter/compiler.py
new file mode 100644
index 0000000..3a3ce34
--- /dev/null
+++ b/mesonbuild/interpreter/compiler.py
@@ -0,0 +1,766 @@
+import functools
+
+from .interpreterobjects import (IncludeDirsHolder, ExternalLibraryHolder,
+                                 extract_required_kwarg, extract_search_dirs)
+
+from .. import mesonlib
+from .. import mlog
+from .. import dependencies
+from ..interpreterbase import (InterpreterObject, noPosargs, noKwargs, permittedKwargs,
+                               FeatureNew, FeatureNewKwargs, disablerIfNotFound,
+                               check_stringlist, InterpreterException, InvalidArguments,
+                               InvalidCode)
+
+import typing as T
+
+class TryRunResultHolder(InterpreterObject):
+    def __init__(self, res):
+        super().__init__()
+        self.res = res
+        self.methods.update({'returncode': self.returncode_method,
+                             'compiled': self.compiled_method,
+                             'stdout': self.stdout_method,
+                             'stderr': self.stderr_method,
+                             })
+
+    @noPosargs
+    @permittedKwargs({})
+    def returncode_method(self, args, kwargs):
+        return self.res.returncode
+
+    @noPosargs
+    @permittedKwargs({})
+    def compiled_method(self, args, kwargs):
+        return self.res.compiled
+
+    @noPosargs
+    @permittedKwargs({})
+    def stdout_method(self, args, kwargs):
+        return self.res.stdout
+
+    @noPosargs
+    @permittedKwargs({})
+    def stderr_method(self, args, kwargs):
+        return self.res.stderr
+
+header_permitted_kwargs = {
+    'required',
+    'prefix',
+    'no_builtin_args',
+    'include_directories',
+    'args',
+    'dependencies',
+}
+
+find_library_permitted_kwargs = {
+    'has_headers',
+    'required',
+    'dirs',
+    'static',
+}
+
+find_library_permitted_kwargs |= {'header_' + k for k in header_permitted_kwargs}
+
+class CompilerHolder(InterpreterObject):
+    def __init__(self, compiler: 'Compiler', env: 'Environment', subproject: str):
+        InterpreterObject.__init__(self)
+        self.compiler = compiler
+        self.environment = env
+        self.subproject = subproject
+        self.methods.update({'compiles': self.compiles_method,
+                             'links': self.links_method,
+                             'get_id': self.get_id_method,
+                             'get_linker_id': self.get_linker_id_method,
+                             'compute_int': self.compute_int_method,
+                             'sizeof': self.sizeof_method,
+                             'get_define': self.get_define_method,
+                             'check_header': self.check_header_method,
+                             'has_header': self.has_header_method,
+                             'has_header_symbol': self.has_header_symbol_method,
+                             'run': self.run_method,
+                             'has_function': self.has_function_method,
+                             'has_member': self.has_member_method,
+                             'has_members': self.has_members_method,
+                             'has_type': self.has_type_method,
+                             'alignment': self.alignment_method,
+                             'version': self.version_method,
+                             'cmd_array': self.cmd_array_method,
+                             'find_library': self.find_library_method,
+                             'has_argument': self.has_argument_method,
+                             'has_function_attribute': self.has_func_attribute_method,
+                             'get_supported_function_attributes': self.get_supported_function_attributes_method,
+                             'has_multi_arguments': self.has_multi_arguments_method,
+                             'get_supported_arguments': self.get_supported_arguments_method,
+                             'first_supported_argument': self.first_supported_argument_method,
+                             'has_link_argument': self.has_link_argument_method,
+                             'has_multi_link_arguments': self.has_multi_link_arguments_method,
+                             'get_supported_link_arguments': self.get_supported_link_arguments_method,
+                             'first_supported_link_argument': self.first_supported_link_argument_method,
+                             'unittest_args': self.unittest_args_method,
+                             'symbols_have_underscore_prefix': self.symbols_have_underscore_prefix_method,
+                             'get_argument_syntax': self.get_argument_syntax_method,
+                             })
+
+    def _dep_msg(self, deps, endl):
+        msg_single = 'with dependency {}'
+        msg_many = 'with dependencies {}'
+        if not deps:
+            return endl
+        if endl is None:
+            endl = ''
+        names = []
+        for d in deps:
+            if isinstance(d, dependencies.InternalDependency):
+                continue
+            if isinstance(d, dependencies.ExternalLibrary):
+                name = '-l' + d.name
+            else:
+                name = d.name
+            names.append(name)
+        if not names:
+            return None
+        tpl = msg_many if len(names) > 1 else msg_single
+        return tpl.format(', '.join(names)) + endl
+
+    @noPosargs
+    @permittedKwargs({})
+    def version_method(self, args, kwargs):
+        return self.compiler.version
+
+    @noPosargs
+    @permittedKwargs({})
+    def cmd_array_method(self, args, kwargs):
+        return self.compiler.exelist
+
+    def determine_args(self, kwargs, mode='link'):
+        nobuiltins = kwargs.get('no_builtin_args', False)
+        if not isinstance(nobuiltins, bool):
+            raise InterpreterException('Type of no_builtin_args not a boolean.')
+        args = []
+        incdirs = mesonlib.extract_as_list(kwargs, 'include_directories')
+        for i in incdirs:
+            if not isinstance(i, IncludeDirsHolder):
+                raise InterpreterException('Include directories argument must be an include_directories object.')
+            for idir in i.held_object.to_string_list(self.environment.get_source_dir()):
+                args += self.compiler.get_include_args(idir, False)
+        if not nobuiltins:
+            opts = self.environment.coredata.options
+            args += self.compiler.get_option_compile_args(opts)
+            if mode == 'link':
+                args += self.compiler.get_option_link_args(opts)
+        args += mesonlib.stringlistify(kwargs.get('args', []))
+        return args
+
+    def determine_dependencies(self, kwargs, endl=':'):
+        deps = kwargs.get('dependencies', None)
+        if deps is not None:
+            final_deps = []
+            while deps:
+                next_deps = []
+                for d in mesonlib.unholder(mesonlib.listify(deps)):
+                    if not isinstance(d, dependencies.Dependency) or d.is_built():
+                        raise InterpreterException('Dependencies must be external dependencies')
+                    final_deps.append(d)
+                    next_deps.extend(d.ext_deps)
+                deps = next_deps
+            deps = final_deps
+        return deps, self._dep_msg(deps, endl)
+
+    @permittedKwargs({
+        'prefix',
+        'args',
+        'dependencies',
+    })
+    def alignment_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Alignment method takes exactly one positional argument.')
+        check_stringlist(args)
+        typename = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of alignment must be a string.')
+        extra_args = mesonlib.stringlistify(kwargs.get('args', []))
+        deps, msg = self.determine_dependencies(kwargs)
+        result = self.compiler.alignment(typename, prefix, self.environment,
+                                         extra_args=extra_args,
+                                         dependencies=deps)
+        mlog.log('Checking for alignment of', mlog.bold(typename, True), msg, result)
+        return result
+
+    @permittedKwargs({
+        'name',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def run_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Run method takes exactly one positional argument.')
+        code = args[0]
+        if isinstance(code, mesonlib.File):
+            code = mesonlib.File.from_absolute_file(
+                code.rel_to_builddir(self.environment.source_dir))
+        elif not isinstance(code, str):
+            raise InvalidArguments('Argument must be string or file.')
+        testname = kwargs.get('name', '')
+        if not isinstance(testname, str):
+            raise InterpreterException('Testname argument must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs, endl=None)
+        result = self.compiler.run(code, self.environment, extra_args=extra_args,
+                                   dependencies=deps)
+        if len(testname) > 0:
+            if not result.compiled:
+                h = mlog.red('DID NOT COMPILE')
+            elif result.returncode == 0:
+                h = mlog.green('YES')
+            else:
+                h = mlog.red('NO (%d)' % result.returncode)
+            mlog.log('Checking if', mlog.bold(testname, True), msg, 'runs:', h)
+        return TryRunResultHolder(result)
+
+    @noPosargs
+    @permittedKwargs({})
+    def get_id_method(self, args, kwargs):
+        return self.compiler.get_id()
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureNew('compiler.get_linker_id', '0.53.0')
+    def get_linker_id_method(self, args, kwargs):
+        return self.compiler.get_linker_id()
+
+    @noPosargs
+    @permittedKwargs({})
+    def symbols_have_underscore_prefix_method(self, args, kwargs):
+        '''
+        Check if the compiler prefixes _ (underscore) to global C symbols
+        See: https://en.wikipedia.org/wiki/Name_mangling#C
+        '''
+        return self.compiler.symbols_have_underscore_prefix(self.environment)
+
+    @noPosargs
+    @permittedKwargs({})
+    def unittest_args_method(self, args, kwargs):
+        '''
+        This function is deprecated and should not be used.
+        It can be removed in a future version of Meson.
+        '''
+        if not hasattr(self.compiler, 'get_feature_args'):
+            raise InterpreterException(f'This {self.compiler.get_display_language()} compiler has no feature arguments.')
+        build_to_src = os.path.relpath(self.environment.get_source_dir(), self.environment.get_build_dir())
+        return self.compiler.get_feature_args({'unittest': 'true'}, build_to_src)
+
+    @permittedKwargs({
+        'prefix',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def has_member_method(self, args, kwargs):
+        if len(args) != 2:
+            raise InterpreterException('Has_member takes exactly two arguments.')
+        check_stringlist(args)
+        typename, membername = args
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_member must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        had, cached = self.compiler.has_members(typename, [membername], prefix,
+                                                self.environment,
+                                                extra_args=extra_args,
+                                                dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if had:
+            hadtxt = mlog.green('YES')
+        else:
+            hadtxt = mlog.red('NO')
+        mlog.log('Checking whether type', mlog.bold(typename, True),
+                 'has member', mlog.bold(membername, True), msg, hadtxt, cached)
+        return had
+
+    @permittedKwargs({
+        'prefix',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def has_members_method(self, args, kwargs):
+        if len(args) < 2:
+            raise InterpreterException('Has_members needs at least two arguments.')
+        check_stringlist(args)
+        typename, *membernames = args
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_members must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        had, cached = self.compiler.has_members(typename, membernames, prefix,
+                                                self.environment,
+                                                extra_args=extra_args,
+                                                dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if had:
+            hadtxt = mlog.green('YES')
+        else:
+            hadtxt = mlog.red('NO')
+        members = mlog.bold(', '.join([f'"{m}"' for m in membernames]))
+        mlog.log('Checking whether type', mlog.bold(typename, True),
+                 'has members', members, msg, hadtxt, cached)
+        return had
+
+    @permittedKwargs({
+        'prefix',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def has_function_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Has_function takes exactly one argument.')
+        check_stringlist(args)
+        funcname = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_function must be a string.')
+        extra_args = self.determine_args(kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        had, cached = self.compiler.has_function(funcname, prefix, self.environment,
+                                                 extra_args=extra_args,
+                                                 dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if had:
+            hadtxt = mlog.green('YES')
+        else:
+            hadtxt = mlog.red('NO')
+        mlog.log('Checking for function', mlog.bold(funcname, True), msg, hadtxt, cached)
+        return had
+
+    @permittedKwargs({
+        'prefix',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def has_type_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Has_type takes exactly one argument.')
+        check_stringlist(args)
+        typename = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_type must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        had, cached = self.compiler.has_type(typename, prefix, self.environment,
+                                             extra_args=extra_args, dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if had:
+            hadtxt = mlog.green('YES')
+        else:
+            hadtxt = mlog.red('NO')
+        mlog.log('Checking for type', mlog.bold(typename, True), msg, hadtxt, cached)
+        return had
+
+    @FeatureNew('compiler.compute_int', '0.40.0')
+    @permittedKwargs({
+        'prefix',
+        'low',
+        'high',
+        'guess',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def compute_int_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Compute_int takes exactly one argument.')
+        check_stringlist(args)
+        expression = args[0]
+        prefix = kwargs.get('prefix', '')
+        low = kwargs.get('low', None)
+        high = kwargs.get('high', None)
+        guess = kwargs.get('guess', None)
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of compute_int must be a string.')
+        if low is not None and not isinstance(low, int):
+            raise InterpreterException('Low argument of compute_int must be an int.')
+        if high is not None and not isinstance(high, int):
+            raise InterpreterException('High argument of compute_int must be an int.')
+        if guess is not None and not isinstance(guess, int):
+            raise InterpreterException('Guess argument of compute_int must be an int.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        res = self.compiler.compute_int(expression, low, high, guess, prefix,
+                                        self.environment, extra_args=extra_args,
+                                        dependencies=deps)
+        mlog.log('Computing int of', mlog.bold(expression, True), msg, res)
+        return res
+
+    @permittedKwargs({
+        'prefix',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def sizeof_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Sizeof takes exactly one argument.')
+        check_stringlist(args)
+        element = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of sizeof must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        esize = self.compiler.sizeof(element, prefix, self.environment,
+                                     extra_args=extra_args, dependencies=deps)
+        mlog.log('Checking for size of', mlog.bold(element, True), msg, esize)
+        return esize
+
+    @FeatureNew('compiler.get_define', '0.40.0')
+    @permittedKwargs({
+        'prefix',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def get_define_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('get_define() takes exactly one argument.')
+        check_stringlist(args)
+        element = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of get_define() must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        value, cached = self.compiler.get_define(element, prefix, self.environment,
+                                                 extra_args=extra_args,
+                                                 dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        mlog.log('Fetching value of define', mlog.bold(element, True), msg, value, cached)
+        return value
+
+    @permittedKwargs({
+        'name',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def compiles_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('compiles method takes exactly one argument.')
+        code = args[0]
+        if isinstance(code, mesonlib.File):
+            code = mesonlib.File.from_absolute_file(
+                code.rel_to_builddir(self.environment.source_dir))
+        elif not isinstance(code, str):
+            raise InvalidArguments('Argument must be string or file.')
+        testname = kwargs.get('name', '')
+        if not isinstance(testname, str):
+            raise InterpreterException('Testname argument must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs, endl=None)
+        result, cached = self.compiler.compiles(code, self.environment,
+                                                extra_args=extra_args,
+                                                dependencies=deps)
+        if len(testname) > 0:
+            if result:
+                h = mlog.green('YES')
+            else:
+                h = mlog.red('NO')
+            cached = mlog.blue('(cached)') if cached else ''
+            mlog.log('Checking if', mlog.bold(testname, True), msg, 'compiles:', h, cached)
+        return result
+
+    @permittedKwargs({
+        'name',
+        'no_builtin_args',
+        'include_directories',
+        'args',
+        'dependencies',
+    })
+    def links_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('links method takes exactly one argument.')
+        code = args[0]
+        if isinstance(code, mesonlib.File):
+            code = mesonlib.File.from_absolute_file(
+                code.rel_to_builddir(self.environment.source_dir))
+        elif not isinstance(code, str):
+            raise InvalidArguments('Argument must be string or file.')
+        testname = kwargs.get('name', '')
+        if not isinstance(testname, str):
+            raise InterpreterException('Testname argument must be a string.')
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs, endl=None)
+        result, cached = self.compiler.links(code, self.environment,
+                                             extra_args=extra_args,
+                                             dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if len(testname) > 0:
+            if result:
+                h = mlog.green('YES')
+            else:
+                h = mlog.red('NO')
+            mlog.log('Checking if', mlog.bold(testname, True), msg, 'links:', h, cached)
+        return result
+
+    @FeatureNew('compiler.check_header', '0.47.0')
+    @FeatureNewKwargs('compiler.check_header', '0.50.0', ['required'])
+    @permittedKwargs(header_permitted_kwargs)
+    def check_header_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('check_header method takes exactly one argument.')
+        check_stringlist(args)
+        hname = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_header must be a string.')
+        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject, default=False)
+        if disabled:
+            mlog.log('Check usable header', mlog.bold(hname, True), 'skipped: feature', mlog.bold(feature), 'disabled')
+            return False
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        haz, cached = self.compiler.check_header(hname, prefix, self.environment,
+                                                 extra_args=extra_args,
+                                                 dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if required and not haz:
+            raise InterpreterException(f'{self.compiler.get_display_language()} header {hname!r} not usable')
+        elif haz:
+            h = mlog.green('YES')
+        else:
+            h = mlog.red('NO')
+        mlog.log('Check usable header', mlog.bold(hname, True), msg, h, cached)
+        return haz
+
+    @FeatureNewKwargs('compiler.has_header', '0.50.0', ['required'])
+    @permittedKwargs(header_permitted_kwargs)
+    def has_header_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('has_header method takes exactly one argument.')
+        check_stringlist(args)
+        hname = args[0]
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_header must be a string.')
+        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject, default=False)
+        if disabled:
+            mlog.log('Has header', mlog.bold(hname, True), 'skipped: feature', mlog.bold(feature), 'disabled')
+            return False
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        haz, cached = self.compiler.has_header(hname, prefix, self.environment,
+                                               extra_args=extra_args, dependencies=deps)
+        cached = mlog.blue('(cached)') if cached else ''
+        if required and not haz:
+            raise InterpreterException(f'{self.compiler.get_display_language()} header {hname!r} not found')
+        elif haz:
+            h = mlog.green('YES')
+        else:
+            h = mlog.red('NO')
+        mlog.log('Has header', mlog.bold(hname, True), msg, h, cached)
+        return haz
+
+    @FeatureNewKwargs('compiler.has_header_symbol', '0.50.0', ['required'])
+    @permittedKwargs(header_permitted_kwargs)
+    def has_header_symbol_method(self, args, kwargs):
+        if len(args) != 2:
+            raise InterpreterException('has_header_symbol method takes exactly two arguments.')
+        check_stringlist(args)
+        hname, symbol = args
+        prefix = kwargs.get('prefix', '')
+        if not isinstance(prefix, str):
+            raise InterpreterException('Prefix argument of has_header_symbol must be a string.')
+        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject, default=False)
+        if disabled:
+            mlog.log(f'Header <{hname}> has symbol', mlog.bold(symbol, True), 'skipped: feature', mlog.bold(feature), 'disabled')
+            return False
+        extra_args = functools.partial(self.determine_args, kwargs)
+        deps, msg = self.determine_dependencies(kwargs)
+        haz, cached = self.compiler.has_header_symbol(hname, symbol, prefix, self.environment,
+                                                      extra_args=extra_args,
+                                                      dependencies=deps)
+        if required and not haz:
+            raise InterpreterException(f'{self.compiler.get_display_language()} symbol {symbol} not found in header {hname}')
+        elif haz:
+            h = mlog.green('YES')
+        else:
+            h = mlog.red('NO')
+        cached = mlog.blue('(cached)') if cached else ''
+        mlog.log(f'Header <{hname}> has symbol', mlog.bold(symbol, True), msg, h, cached)
+        return haz
+
+    def notfound_library(self, libname):
+        lib = dependencies.ExternalLibrary(libname, None,
+                                           self.environment,
+                                           self.compiler.language,
+                                           silent=True)
+        return ExternalLibraryHolder(lib, self.subproject)
+
+    @FeatureNewKwargs('compiler.find_library', '0.51.0', ['static'])
+    @FeatureNewKwargs('compiler.find_library', '0.50.0', ['has_headers'])
+    @FeatureNewKwargs('compiler.find_library', '0.49.0', ['disabler'])
+    @disablerIfNotFound
+    @permittedKwargs(find_library_permitted_kwargs)
+    def find_library_method(self, args, kwargs):
+        # TODO add dependencies support?
+        if len(args) != 1:
+            raise InterpreterException('find_library method takes one argument.')
+        libname = args[0]
+        if not isinstance(libname, str):
+            raise InterpreterException('Library name not a string.')
+
+        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject)
+        if disabled:
+            mlog.log('Library', mlog.bold(libname), 'skipped: feature', mlog.bold(feature), 'disabled')
+            return self.notfound_library(libname)
+
+        has_header_kwargs = {k[7:]: v for k, v in kwargs.items() if k.startswith('header_')}
+        has_header_kwargs['required'] = required
+        headers = mesonlib.stringlistify(kwargs.get('has_headers', []))
+        for h in headers:
+            if not self.has_header_method([h], has_header_kwargs):
+                return self.notfound_library(libname)
+
+        search_dirs = extract_search_dirs(kwargs)
+
+        libtype = mesonlib.LibType.PREFER_SHARED
+        if 'static' in kwargs:
+            if not isinstance(kwargs['static'], bool):
+                raise InterpreterException('static must be a boolean')
+            libtype = mesonlib.LibType.STATIC if kwargs['static'] else mesonlib.LibType.SHARED
+        linkargs = self.compiler.find_library(libname, self.environment, search_dirs, libtype)
+        if required and not linkargs:
+            if libtype == mesonlib.LibType.PREFER_SHARED:
+                libtype = 'shared or static'
+            else:
+                libtype = libtype.name.lower()
+            raise InterpreterException('{} {} library {!r} not found'
+                                       .format(self.compiler.get_display_language(),
+                                               libtype, libname))
+        lib = dependencies.ExternalLibrary(libname, linkargs, self.environment,
+                                           self.compiler.language)
+        return ExternalLibraryHolder(lib, self.subproject)
+
+    @permittedKwargs({})
+    def has_argument_method(self, args: T.Sequence[str], kwargs) -> bool:
+        args = mesonlib.stringlistify(args)
+        if len(args) != 1:
+            raise InterpreterException('has_argument takes exactly one argument.')
+        return self.has_multi_arguments_method(args, kwargs)
+
+    @permittedKwargs({})
+    def has_multi_arguments_method(self, args: T.Sequence[str], kwargs: dict):
+        args = mesonlib.stringlistify(args)
+        result, cached = self.compiler.has_multi_arguments(args, self.environment)
+        if result:
+            h = mlog.green('YES')
+        else:
+            h = mlog.red('NO')
+        cached = mlog.blue('(cached)') if cached else ''
+        mlog.log(
+            'Compiler for {} supports arguments {}:'.format(
+                self.compiler.get_display_language(), ' '.join(args)),
+            h, cached)
+        return result
+
+    @FeatureNew('compiler.get_supported_arguments', '0.43.0')
+    @permittedKwargs({})
+    def get_supported_arguments_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        supported_args = []
+        for arg in args:
+            if self.has_argument_method(arg, kwargs):
+                supported_args.append(arg)
+        return supported_args
+
+    @permittedKwargs({})
+    def first_supported_argument_method(self, args: T.Sequence[str], kwargs: dict) -> T.List[str]:
+        for arg in mesonlib.stringlistify(args):
+            if self.has_argument_method(arg, kwargs):
+                mlog.log('First supported argument:', mlog.bold(arg))
+                return [arg]
+        mlog.log('First supported argument:', mlog.red('None'))
+        return []
+
+    @FeatureNew('compiler.has_link_argument', '0.46.0')
+    @permittedKwargs({})
+    def has_link_argument_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        if len(args) != 1:
+            raise InterpreterException('has_link_argument takes exactly one argument.')
+        return self.has_multi_link_arguments_method(args, kwargs)
+
+    @FeatureNew('compiler.has_multi_link_argument', '0.46.0')
+    @permittedKwargs({})
+    def has_multi_link_arguments_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        result, cached = self.compiler.has_multi_link_arguments(args, self.environment)
+        cached = mlog.blue('(cached)') if cached else ''
+        if result:
+            h = mlog.green('YES')
+        else:
+            h = mlog.red('NO')
+        mlog.log(
+            'Compiler for {} supports link arguments {}:'.format(
+                self.compiler.get_display_language(), ' '.join(args)),
+            h, cached)
+        return result
+
+    @FeatureNew('compiler.get_supported_link_arguments_method', '0.46.0')
+    @permittedKwargs({})
+    def get_supported_link_arguments_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        supported_args = []
+        for arg in args:
+            if self.has_link_argument_method(arg, kwargs):
+                supported_args.append(arg)
+        return supported_args
+
+    @FeatureNew('compiler.first_supported_link_argument_method', '0.46.0')
+    @permittedKwargs({})
+    def first_supported_link_argument_method(self, args, kwargs):
+        for i in mesonlib.stringlistify(args):
+            if self.has_link_argument_method(i, kwargs):
+                mlog.log('First supported link argument:', mlog.bold(i))
+                return [i]
+        mlog.log('First supported link argument:', mlog.red('None'))
+        return []
+
+    @FeatureNew('compiler.has_function_attribute', '0.48.0')
+    @permittedKwargs({})
+    def has_func_attribute_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        if len(args) != 1:
+            raise InterpreterException('has_func_attribute takes exactly one argument.')
+        result, cached = self.compiler.has_func_attribute(args[0], self.environment)
+        cached = mlog.blue('(cached)') if cached else ''
+        h = mlog.green('YES') if result else mlog.red('NO')
+        mlog.log('Compiler for {} supports function attribute {}:'.format(self.compiler.get_display_language(), args[0]), h, cached)
+        return result
+
+    @FeatureNew('compiler.get_supported_function_attributes', '0.48.0')
+    @permittedKwargs({})
+    def get_supported_function_attributes_method(self, args, kwargs):
+        args = mesonlib.stringlistify(args)
+        return [a for a in args if self.has_func_attribute_method(a, kwargs)]
+
+    @FeatureNew('compiler.get_argument_syntax_method', '0.49.0')
+    @noPosargs
+    @noKwargs
+    def get_argument_syntax_method(self, args, kwargs):
+        return self.compiler.get_argument_syntax()
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter/interpreter.py
index 2b7a36a..2056379 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter/interpreter.py
@@ -11,54 +11,58 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from . import mparser
-from . import environment
-from . import coredata
-from . import dependencies
-from . import mlog
-from . import build
-from . import optinterpreter
-from . import compilers
-from .wrap import wrap, WrapMode
-from . import mesonlib
-from .mesonlib import FileMode, MachineChoice, OptionKey, Popen_safe, listify, extract_as_list, has_path_sep, unholder
-from .programs import ExternalProgram, NonExistingExternalProgram, OverrideProgram
-from .dependencies import InternalDependency, Dependency, NotFoundDependency, DependencyException
-from .depfile import DepFile
-from .interpreterbase import InterpreterBase, typed_pos_args
-from .interpreterbase import check_stringlist, flatten, noPosargs, noKwargs, stringArgs, permittedKwargs, noArgsFlattening
-from .interpreterbase import InterpreterException, InvalidArguments, InvalidCode, SubdirDoneRequest
-from .interpreterbase import InterpreterObject, MutableInterpreterObject, Disabler, disablerIfNotFound
-from .interpreterbase import FeatureNew, FeatureDeprecated, FeatureNewKwargs, FeatureDeprecatedKwargs
-from .interpreterbase import ObjectHolder, MesonVersionString, RangeHolder
-from .interpreterbase import TYPE_var, TYPE_nkwargs
-from .modules import ModuleReturnValue, ModuleObject, ModuleState
-from .cmake import CMakeInterpreter
-from .backend.backends import TestProtocol, Backend, ExecutableSerialisation
-
-from pathlib import Path, PurePath
+from .. import mparser
+from .. import environment
+from .. import coredata
+from .. import dependencies
+from .. import mlog
+from .. import build
+from .. import optinterpreter
+from .. import compilers
+from ..wrap import wrap, WrapMode
+from .. import mesonlib
+from ..mesonlib import FileMode, MachineChoice, OptionKey, listify, extract_as_list, has_path_sep, unholder
+from ..programs import ExternalProgram, NonExistingExternalProgram
+from ..dependencies import Dependency, NotFoundDependency, DependencyException
+from ..depfile import DepFile
+from ..interpreterbase import InterpreterBase, typed_pos_args
+from ..interpreterbase import noPosargs, noKwargs, stringArgs, permittedKwargs, noArgsFlattening
+from ..interpreterbase import InterpreterException, InvalidArguments, InvalidCode, SubdirDoneRequest
+from ..interpreterbase import InterpreterObject, Disabler, disablerIfNotFound
+from ..interpreterbase import FeatureNew, FeatureDeprecated, FeatureNewKwargs, FeatureDeprecatedKwargs
+from ..interpreterbase import ObjectHolder, RangeHolder
+from ..modules import ModuleObject
+from ..cmake import CMakeInterpreter
+from ..backend.backends import Backend, ExecutableSerialisation
+
+from .mesonmain import MesonMain
+from .compiler import CompilerHolder
+from .interpreterobjects import (SubprojectHolder, MachineHolder, EnvironmentVariablesHolder,
+                                 FeatureOptionHolder, ExternalProgramHolder, CustomTargetHolder,
+                                 RunTargetHolder, IncludeDirsHolder, ConfigurationDataHolder,
+                                 DependencyHolder, ModuleObjectHolder, GeneratedListHolder,
+                                 TargetHolder, CustomTargetIndexHolder, GeneratedObjectsHolder,
+                                 StaticLibraryHolder, ExecutableHolder, SharedLibraryHolder,
+                                 SharedModuleHolder, HeadersHolder, BothLibrariesHolder,
+                                 BuildTargetHolder, DataHolder, JarHolder, Test, RunProcess,
+                                 ManHolder, GeneratorHolder, InstallDirHolder, extract_required_kwarg,
+                                 extract_search_dirs)
+
+from pathlib import Path
 import os
 import shutil
 import uuid
 import re
-import shlex
 import stat
-import subprocess
 import collections
-import functools
 import typing as T
 
 import importlib
 
 if T.TYPE_CHECKING:
-    from .compilers import Compiler
-    from .envconfig import MachineInfo
-    from .environment import Environment
-
-permitted_method_kwargs = {
-    'partial_dependency': {'compile_args', 'link_args', 'links', 'includes',
-                           'sources'},
-}
+    from ..compilers import Compiler
+    from ..envconfig import MachineInfo
+    from ..environment import Environment
 
 def stringifyUserArguments(args, quote=False):
     if isinstance(args, list):
@@ -71,1736 +75,6 @@ def stringifyUserArguments(args, quote=False):
         return f"'{args}'" if quote else args
     raise InvalidArguments('Function accepts only strings, integers, lists, dictionaries and lists thereof.')
 
-
-class FeatureOptionHolder(InterpreterObject, ObjectHolder[coredata.UserFeatureOption]):
-    def __init__(self, env: 'Environment', name: str, option: coredata.UserFeatureOption):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, option)
-        if option.is_auto():
-            # TODO: we need to case here because options is not a TypedDict
-            self.held_object = T.cast(coredata.UserFeatureOption, env.coredata.options[OptionKey('auto_features')])
-        self.name = name
-        self.methods.update({'enabled': self.enabled_method,
-                             'disabled': self.disabled_method,
-                             'auto': self.auto_method,
-                             })
-
-    @noPosargs
-    @permittedKwargs({})
-    def enabled_method(self, args, kwargs):
-        return self.held_object.is_enabled()
-
-    @noPosargs
-    @permittedKwargs({})
-    def disabled_method(self, args, kwargs):
-        return self.held_object.is_disabled()
-
-    @noPosargs
-    @permittedKwargs({})
-    def auto_method(self, args, kwargs):
-        return self.held_object.is_auto()
-
-def extract_required_kwarg(kwargs, subproject, feature_check=None, default=True):
-    val = kwargs.get('required', default)
-    disabled = False
-    required = False
-    feature = None
-    if isinstance(val, FeatureOptionHolder):
-        if not feature_check:
-            feature_check = FeatureNew('User option "feature"', '0.47.0')
-        feature_check.use(subproject)
-        option = val.held_object
-        feature = val.name
-        if option.is_disabled():
-            disabled = True
-        elif option.is_enabled():
-            required = True
-    elif isinstance(val, bool):
-        required = val
-    else:
-        raise InterpreterException('required keyword argument must be boolean or a feature option')
-
-    # Keep boolean value in kwargs to simplify other places where this kwarg is
-    # checked.
-    kwargs['required'] = required
-
-    return disabled, required, feature
-
-def extract_search_dirs(kwargs):
-    search_dirs = mesonlib.stringlistify(kwargs.get('dirs', []))
-    search_dirs = [Path(d).expanduser() for d in search_dirs]
-    for d in search_dirs:
-        if mesonlib.is_windows() and d.root.startswith('\\'):
-            # a Unix-path starting with `/` that is not absolute on Windows.
-            # discard without failing for end-user ease of cross-platform directory arrays
-            continue
-        if not d.is_absolute():
-            raise InvalidCode(f'Search directory {d} is not an absolute path.')
-    return list(map(str, search_dirs))
-
-class TryRunResultHolder(InterpreterObject):
-    def __init__(self, res):
-        super().__init__()
-        self.res = res
-        self.methods.update({'returncode': self.returncode_method,
-                             'compiled': self.compiled_method,
-                             'stdout': self.stdout_method,
-                             'stderr': self.stderr_method,
-                             })
-
-    @noPosargs
-    @permittedKwargs({})
-    def returncode_method(self, args, kwargs):
-        return self.res.returncode
-
-    @noPosargs
-    @permittedKwargs({})
-    def compiled_method(self, args, kwargs):
-        return self.res.compiled
-
-    @noPosargs
-    @permittedKwargs({})
-    def stdout_method(self, args, kwargs):
-        return self.res.stdout
-
-    @noPosargs
-    @permittedKwargs({})
-    def stderr_method(self, args, kwargs):
-        return self.res.stderr
-
-class RunProcess(InterpreterObject):
-
-    def __init__(self, cmd, args, env, source_dir, build_dir, subdir, mesonintrospect, in_builddir=False, check=False, capture=True):
-        super().__init__()
-        if not isinstance(cmd, ExternalProgram):
-            raise AssertionError('BUG: RunProcess must be passed an ExternalProgram')
-        self.capture = capture
-        pc, self.stdout, self.stderr = self.run_command(cmd, args, env, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check)
-        self.returncode = pc.returncode
-        self.methods.update({'returncode': self.returncode_method,
-                             'stdout': self.stdout_method,
-                             'stderr': self.stderr_method,
-                             })
-
-    def run_command(self, cmd, args, env, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check=False):
-        command_array = cmd.get_command() + args
-        menv = {'MESON_SOURCE_ROOT': source_dir,
-                'MESON_BUILD_ROOT': build_dir,
-                'MESON_SUBDIR': subdir,
-                'MESONINTROSPECT': ' '.join([shlex.quote(x) for x in mesonintrospect]),
-                }
-        if in_builddir:
-            cwd = os.path.join(build_dir, subdir)
-        else:
-            cwd = os.path.join(source_dir, subdir)
-        child_env = os.environ.copy()
-        child_env.update(menv)
-        child_env = env.get_env(child_env)
-        stdout = subprocess.PIPE if self.capture else subprocess.DEVNULL
-        mlog.debug('Running command:', ' '.join(command_array))
-        try:
-            p, o, e = Popen_safe(command_array, stdout=stdout, env=child_env, cwd=cwd)
-            if self.capture:
-                mlog.debug('--- stdout ---')
-                mlog.debug(o)
-            else:
-                o = ''
-                mlog.debug('--- stdout disabled ---')
-            mlog.debug('--- stderr ---')
-            mlog.debug(e)
-            mlog.debug('')
-
-            if check and p.returncode != 0:
-                raise InterpreterException('Command "{}" failed with status {}.'.format(' '.join(command_array), p.returncode))
-
-            return p, o, e
-        except FileNotFoundError:
-            raise InterpreterException('Could not execute command "%s".' % ' '.join(command_array))
-
-    @noPosargs
-    @permittedKwargs({})
-    def returncode_method(self, args, kwargs):
-        return self.returncode
-
-    @noPosargs
-    @permittedKwargs({})
-    def stdout_method(self, args, kwargs):
-        return self.stdout
-
-    @noPosargs
-    @permittedKwargs({})
-    def stderr_method(self, args, kwargs):
-        return self.stderr
-
-class EnvironmentVariablesHolder(MutableInterpreterObject, ObjectHolder[build.EnvironmentVariables]):
-    def __init__(self, initial_values=None, subproject: str = ''):
-        MutableInterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, build.EnvironmentVariables(), subproject)
-        self.methods.update({'set': self.set_method,
-                             'append': self.append_method,
-                             'prepend': self.prepend_method,
-                             })
-        if isinstance(initial_values, dict):
-            for k, v in initial_values.items():
-                self.set_method([k, v], {})
-        elif initial_values is not None:
-            for e in mesonlib.stringlistify(initial_values):
-                if '=' not in e:
-                    raise InterpreterException('Env var definition must be of type key=val.')
-                (k, val) = e.split('=', 1)
-                k = k.strip()
-                val = val.strip()
-                if ' ' in k:
-                    raise InterpreterException('Env var key must not have spaces in it.')
-                self.set_method([k, val], {})
-
-    def __repr__(self) -> str:
-        repr_str = "<{0}: {1}>"
-        return repr_str.format(self.__class__.__name__, self.held_object.envvars)
-
-    def unpack_separator(self, kwargs: T.Dict[str, T.Any]) -> str:
-        separator = kwargs.get('separator', os.pathsep)
-        if not isinstance(separator, str):
-            raise InterpreterException("EnvironmentVariablesHolder methods 'separator'"
-                                       " argument needs to be a string.")
-        return separator
-
-    def warn_if_has_name(self, name: str) -> None:
-        # Multiple append/prepend operations was not supported until 0.58.0.
-        if self.held_object.has_name(name):
-            m = f'Overriding previous value of environment variable {name!r} with a new one'
-            FeatureNew('0.58.0', m).use(self.subproject)
-
-    @stringArgs
-    @permittedKwargs({'separator'})
-    @typed_pos_args('environment.set', str, varargs=str, min_varargs=1)
-    def set_method(self, args: T.Tuple[str, T.List[str]], kwargs: T.Dict[str, T.Any]) -> None:
-        name, values = args
-        separator = self.unpack_separator(kwargs)
-        self.held_object.set(name, values, separator)
-
-    @stringArgs
-    @permittedKwargs({'separator'})
-    @typed_pos_args('environment.append', str, varargs=str, min_varargs=1)
-    def append_method(self, args: T.Tuple[str, T.List[str]], kwargs: T.Dict[str, T.Any]) -> None:
-        name, values = args
-        separator = self.unpack_separator(kwargs)
-        self.warn_if_has_name(name)
-        self.held_object.append(name, values, separator)
-
-    @stringArgs
-    @permittedKwargs({'separator'})
-    @typed_pos_args('environment.prepend', str, varargs=str, min_varargs=1)
-    def prepend_method(self, args: T.Tuple[str, T.List[str]], kwargs: T.Dict[str, T.Any]) -> None:
-        name, values = args
-        separator = self.unpack_separator(kwargs)
-        self.warn_if_has_name(name)
-        self.held_object.prepend(name, values, separator)
-
-
-class ConfigurationDataHolder(MutableInterpreterObject, ObjectHolder[build.ConfigurationData]):
-    def __init__(self, pv, initial_values=None):
-        MutableInterpreterObject.__init__(self)
-        self.used = False # These objects become immutable after use in configure_file.
-        ObjectHolder.__init__(self, build.ConfigurationData(), pv)
-        self.methods.update({'set': self.set_method,
-                             'set10': self.set10_method,
-                             'set_quoted': self.set_quoted_method,
-                             'has': self.has_method,
-                             'get': self.get_method,
-                             'keys': self.keys_method,
-                             'get_unquoted': self.get_unquoted_method,
-                             'merge_from': self.merge_from_method,
-                             })
-        if isinstance(initial_values, dict):
-            for k, v in initial_values.items():
-                self.set_method([k, v], {})
-        elif initial_values:
-            raise AssertionError('Unsupported ConfigurationDataHolder initial_values')
-
-    def is_used(self):
-        return self.used
-
-    def mark_used(self):
-        self.used = True
-
-    def validate_args(self, args, kwargs):
-        if len(args) == 1 and isinstance(args[0], list) and len(args[0]) == 2:
-            mlog.deprecation('Passing a list as the single argument to '
-                             'configuration_data.set is deprecated. This will '
-                             'become a hard error in the future.',
-                             location=self.current_node)
-            args = args[0]
-
-        if len(args) != 2:
-            raise InterpreterException("Configuration set requires 2 arguments.")
-        if self.used:
-            raise InterpreterException("Can not set values on configuration object that has been used.")
-        name, val = args
-        if not isinstance(val, (int, str)):
-            msg = 'Setting a configuration data value to {!r} is invalid, ' \
-                  'and will fail at configure_file(). If you are using it ' \
-                  'just to store some values, please use a dict instead.'
-            mlog.deprecation(msg.format(val), location=self.current_node)
-        desc = kwargs.get('description', None)
-        if not isinstance(name, str):
-            raise InterpreterException("First argument to set must be a string.")
-        if desc is not None and not isinstance(desc, str):
-            raise InterpreterException('Description must be a string.')
-
-        return name, val, desc
-
-    @noArgsFlattening
-    def set_method(self, args, kwargs):
-        (name, val, desc) = self.validate_args(args, kwargs)
-        self.held_object.values[name] = (val, desc)
-
-    def set_quoted_method(self, args, kwargs):
-        (name, val, desc) = self.validate_args(args, kwargs)
-        if not isinstance(val, str):
-            raise InterpreterException("Second argument to set_quoted must be a string.")
-        escaped_val = '\\"'.join(val.split('"'))
-        self.held_object.values[name] = ('"' + escaped_val + '"', desc)
-
-    def set10_method(self, args, kwargs):
-        (name, val, desc) = self.validate_args(args, kwargs)
-        if val:
-            self.held_object.values[name] = (1, desc)
-        else:
-            self.held_object.values[name] = (0, desc)
-
-    def has_method(self, args, kwargs):
-        return args[0] in self.held_object.values
-
-    @FeatureNew('configuration_data.get()', '0.38.0')
-    @noArgsFlattening
-    def get_method(self, args, kwargs):
-        if len(args) < 1 or len(args) > 2:
-            raise InterpreterException('Get method takes one or two arguments.')
-        name = args[0]
-        if name in self.held_object:
-            return self.held_object.get(name)[0]
-        if len(args) > 1:
-            return args[1]
-        raise InterpreterException('Entry %s not in configuration data.' % name)
-
-    @FeatureNew('configuration_data.get_unquoted()', '0.44.0')
-    def get_unquoted_method(self, args, kwargs):
-        if len(args) < 1 or len(args) > 2:
-            raise InterpreterException('Get method takes one or two arguments.')
-        name = args[0]
-        if name in self.held_object:
-            val = self.held_object.get(name)[0]
-        elif len(args) > 1:
-            val = args[1]
-        else:
-            raise InterpreterException('Entry %s not in configuration data.' % name)
-        if val[0] == '"' and val[-1] == '"':
-            return val[1:-1]
-        return val
-
-    def get(self, name):
-        return self.held_object.values[name] # (val, desc)
-
-    @FeatureNew('configuration_data.keys()', '0.57.0')
-    @noPosargs
-    def keys_method(self, args, kwargs):
-        return sorted(self.keys())
-
-    def keys(self):
-        return self.held_object.values.keys()
-
-    def merge_from_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Merge_from takes one positional argument.')
-        from_object = args[0]
-        if not isinstance(from_object, ConfigurationDataHolder):
-            raise InterpreterException('Merge_from argument must be a configuration data object.')
-        from_object = from_object.held_object
-        for k, v in from_object.values.items():
-            self.held_object.values[k] = v
-
-# Interpreter objects can not be pickled so we must have
-# these wrappers.
-
-class DependencyHolder(InterpreterObject, ObjectHolder[Dependency]):
-    def __init__(self, dep: Dependency, pv: str):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, dep, pv)
-        self.methods.update({'found': self.found_method,
-                             'type_name': self.type_name_method,
-                             'version': self.version_method,
-                             'name': self.name_method,
-                             'get_pkgconfig_variable': self.pkgconfig_method,
-                             'get_configtool_variable': self.configtool_method,
-                             'get_variable': self.variable_method,
-                             'partial_dependency': self.partial_dependency_method,
-                             'include_type': self.include_type_method,
-                             'as_system': self.as_system_method,
-                             'as_link_whole': self.as_link_whole_method,
-                             })
-
-    def found(self):
-        return self.found_method([], {})
-
-    @noPosargs
-    @permittedKwargs({})
-    def type_name_method(self, args, kwargs):
-        return self.held_object.type_name
-
-    @noPosargs
-    @permittedKwargs({})
-    def found_method(self, args, kwargs):
-        if self.held_object.type_name == 'internal':
-            return True
-        return self.held_object.found()
-
-    @noPosargs
-    @permittedKwargs({})
-    def version_method(self, args, kwargs):
-        return self.held_object.get_version()
-
-    @noPosargs
-    @permittedKwargs({})
-    def name_method(self, args, kwargs):
-        return self.held_object.get_name()
-
-    @FeatureDeprecated('Dependency.get_pkgconfig_variable', '0.56.0',
-                       'use Dependency.get_variable(pkgconfig : ...) instead')
-    @permittedKwargs({'define_variable', 'default'})
-    def pkgconfig_method(self, args, kwargs):
-        args = listify(args)
-        if len(args) != 1:
-            raise InterpreterException('get_pkgconfig_variable takes exactly one argument.')
-        varname = args[0]
-        if not isinstance(varname, str):
-            raise InterpreterException('Variable name must be a string.')
-        return self.held_object.get_pkgconfig_variable(varname, kwargs)
-
-    @FeatureNew('dep.get_configtool_variable', '0.44.0')
-    @FeatureDeprecated('Dependency.get_configtool_variable', '0.56.0',
-                       'use Dependency.get_variable(configtool : ...) instead')
-    @permittedKwargs({})
-    def configtool_method(self, args, kwargs):
-        args = listify(args)
-        if len(args) != 1:
-            raise InterpreterException('get_configtool_variable takes exactly one argument.')
-        varname = args[0]
-        if not isinstance(varname, str):
-            raise InterpreterException('Variable name must be a string.')
-        return self.held_object.get_configtool_variable(varname)
-
-    @FeatureNew('dep.partial_dependency', '0.46.0')
-    @noPosargs
-    @permittedKwargs(permitted_method_kwargs['partial_dependency'])
-    def partial_dependency_method(self, args, kwargs):
-        pdep = self.held_object.get_partial_dependency(**kwargs)
-        return DependencyHolder(pdep, self.subproject)
-
-    @FeatureNew('dep.get_variable', '0.51.0')
-    @typed_pos_args('dep.get_variable', optargs=[str])
-    @permittedKwargs({'cmake', 'pkgconfig', 'configtool', 'internal', 'default_value', 'pkgconfig_define'})
-    @FeatureNewKwargs('dep.get_variable', '0.54.0', ['internal'])
-    def variable_method(self, args: T.Tuple[T.Optional[str]], kwargs: T.Dict[str, T.Any]) -> str:
-        default_varname = args[0]
-        if default_varname is not None:
-            FeatureNew('0.58.0', 'Positional argument to dep.get_variable()').use(self.subproject)
-            for k in ['cmake', 'pkgconfig', 'configtool', 'internal']:
-                kwargs.setdefault(k, default_varname)
-        return self.held_object.get_variable(**kwargs)
-
-    @FeatureNew('dep.include_type', '0.52.0')
-    @noPosargs
-    @permittedKwargs({})
-    def include_type_method(self, args, kwargs):
-        return self.held_object.get_include_type()
-
-    @FeatureNew('dep.as_system', '0.52.0')
-    @permittedKwargs({})
-    def as_system_method(self, args, kwargs):
-        args = listify(args)
-        new_is_system = 'system'
-        if len(args) > 1:
-            raise InterpreterException('as_system takes only one optional value')
-        if len(args) == 1:
-            new_is_system = args[0]
-        new_dep = self.held_object.generate_system_dependency(new_is_system)
-        return DependencyHolder(new_dep, self.subproject)
-
-    @FeatureNew('dep.as_link_whole', '0.56.0')
-    @permittedKwargs({})
-    @noPosargs
-    def as_link_whole_method(self, args, kwargs):
-        if not isinstance(self.held_object, InternalDependency):
-            raise InterpreterException('as_link_whole method is only supported on declare_dependency() objects')
-        new_dep = self.held_object.generate_link_whole_dependency()
-        return DependencyHolder(new_dep, self.subproject)
-
-class ExternalProgramHolder(InterpreterObject, ObjectHolder[ExternalProgram]):
-    def __init__(self, ep: ExternalProgram, subproject: str, backend=None):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, ep)
-        self.subproject = subproject
-        self.backend = backend
-        self.methods.update({'found': self.found_method,
-                             'path': self.path_method,
-                             'full_path': self.full_path_method})
-        self.cached_version = None
-
-    @noPosargs
-    @permittedKwargs({})
-    def found_method(self, args, kwargs):
-        return self.found()
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureDeprecated('ExternalProgram.path', '0.55.0',
-                       'use ExternalProgram.full_path() instead')
-    def path_method(self, args, kwargs):
-        return self._full_path()
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureNew('ExternalProgram.full_path', '0.55.0')
-    def full_path_method(self, args, kwargs):
-        return self._full_path()
-
-    def _full_path(self):
-        exe = self.held_object
-        if isinstance(exe, build.Executable):
-            return self.backend.get_target_filename_abs(exe)
-        return exe.get_path()
-
-    def found(self):
-        return isinstance(self.held_object, build.Executable) or self.held_object.found()
-
-    def get_command(self):
-        return self.held_object.get_command()
-
-    def get_name(self):
-        exe = self.held_object
-        if isinstance(exe, build.Executable):
-            return exe.name
-        return exe.get_name()
-
-    def get_version(self, interpreter):
-        if isinstance(self.held_object, build.Executable):
-            return self.held_object.project_version
-        if not self.cached_version:
-            raw_cmd = self.get_command() + ['--version']
-            cmd = [self, '--version']
-            res = interpreter.run_command_impl(interpreter.current_node, cmd, {}, True)
-            if res.returncode != 0:
-                m = 'Running {!r} failed'
-                raise InterpreterException(m.format(raw_cmd))
-            output = res.stdout.strip()
-            if not output:
-                output = res.stderr.strip()
-            match = re.search(r'([0-9][0-9\.]+)', output)
-            if not match:
-                m = 'Could not find a version number in output of {!r}'
-                raise InterpreterException(m.format(raw_cmd))
-            self.cached_version = match.group(1)
-        return self.cached_version
-
-class ExternalLibraryHolder(InterpreterObject, ObjectHolder[dependencies.ExternalLibrary]):
-    def __init__(self, el: dependencies.ExternalLibrary, pv: str):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, el, pv)
-        self.methods.update({'found': self.found_method,
-                             'type_name': self.type_name_method,
-                             'partial_dependency': self.partial_dependency_method,
-                             })
-
-    def found(self):
-        return self.held_object.found()
-
-    @noPosargs
-    @permittedKwargs({})
-    def type_name_method(self, args, kwargs):
-        return self.held_object.type_name
-
-    @noPosargs
-    @permittedKwargs({})
-    def found_method(self, args, kwargs):
-        return self.found()
-
-    def get_name(self):
-        return self.held_object.name
-
-    def get_compile_args(self):
-        return self.held_object.get_compile_args()
-
-    def get_link_args(self):
-        return self.held_object.get_link_args()
-
-    def get_exe_args(self):
-        return self.held_object.get_exe_args()
-
-    @FeatureNew('dep.partial_dependency', '0.46.0')
-    @noPosargs
-    @permittedKwargs(permitted_method_kwargs['partial_dependency'])
-    def partial_dependency_method(self, args, kwargs):
-        pdep = self.held_object.get_partial_dependency(**kwargs)
-        return DependencyHolder(pdep, self.subproject)
-
-class GeneratorHolder(InterpreterObject, ObjectHolder[build.Generator]):
-    @FeatureNewKwargs('generator', '0.43.0', ['capture'])
-    def __init__(self, interp, args, kwargs):
-        self.interpreter = interp
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, build.Generator(args, kwargs), interp.subproject)
-        self.methods.update({'process': self.process_method})
-
-    @FeatureNewKwargs('generator.process', '0.45.0', ['preserve_path_from'])
-    @permittedKwargs({'extra_args', 'preserve_path_from'})
-    def process_method(self, args, kwargs):
-        extras = mesonlib.stringlistify(kwargs.get('extra_args', []))
-        if 'preserve_path_from' in kwargs:
-            preserve_path_from = kwargs['preserve_path_from']
-            if not isinstance(preserve_path_from, str):
-                raise InvalidArguments('Preserve_path_from must be a string.')
-            preserve_path_from = os.path.normpath(preserve_path_from)
-            if not os.path.isabs(preserve_path_from):
-                # This is a bit of a hack. Fix properly before merging.
-                raise InvalidArguments('Preserve_path_from must be an absolute path for now. Sorry.')
-        else:
-            preserve_path_from = None
-        gl = self.held_object.process_files('Generator', args, self.interpreter,
-                                            preserve_path_from, extra_args=extras)
-        return GeneratedListHolder(gl)
-
-
-class GeneratedListHolder(InterpreterObject, ObjectHolder[build.GeneratedList]):
-    def __init__(self, arg1, extra_args=None):
-        InterpreterObject.__init__(self)
-        if isinstance(arg1, GeneratorHolder):
-            ObjectHolder.__init__(self, build.GeneratedList(arg1.held_object, extra_args if extra_args is not None else []))
-        else:
-            ObjectHolder.__init__(self, arg1)
-
-    def __repr__(self):
-        r = '<{}: {!r}>'
-        return r.format(self.__class__.__name__, self.held_object.get_outputs())
-
-    def add_file(self, a):
-        self.held_object.add_file(a)
-
-# A machine that's statically known from the cross file
-class MachineHolder(InterpreterObject, ObjectHolder['MachineInfo']):
-    def __init__(self, machine_info: 'MachineInfo'):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, machine_info)
-        self.methods.update({'system': self.system_method,
-                             'cpu': self.cpu_method,
-                             'cpu_family': self.cpu_family_method,
-                             'endian': self.endian_method,
-                             })
-
-    @noPosargs
-    @permittedKwargs({})
-    def cpu_family_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
-        return self.held_object.cpu_family
-
-    @noPosargs
-    @permittedKwargs({})
-    def cpu_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
-        return self.held_object.cpu
-
-    @noPosargs
-    @permittedKwargs({})
-    def system_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
-        return self.held_object.system
-
-    @noPosargs
-    @permittedKwargs({})
-    def endian_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
-        return self.held_object.endian
-
-class IncludeDirsHolder(InterpreterObject, ObjectHolder[build.IncludeDirs]):
-    def __init__(self, idobj: build.IncludeDirs):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, idobj)
-
-class HeadersHolder(InterpreterObject, ObjectHolder[build.Headers]):
-
-    def __init__(self, obj: build.Headers):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, obj)
-
-    def set_install_subdir(self, subdir):
-        self.held_object.install_subdir = subdir
-
-    def get_install_subdir(self):
-        return self.held_object.install_subdir
-
-    def get_sources(self):
-        return self.held_object.sources
-
-    def get_custom_install_dir(self):
-        return self.held_object.custom_install_dir
-
-    def get_custom_install_mode(self):
-        return self.held_object.custom_install_mode
-
-class DataHolder(InterpreterObject, ObjectHolder[build.Data]):
-    def __init__(self, data: build.Data):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, data)
-
-    def get_source_subdir(self):
-        return self.held_object.source_subdir
-
-    def get_sources(self):
-        return self.held_object.sources
-
-    def get_install_dir(self):
-        return self.held_object.install_dir
-
-class InstallDirHolder(InterpreterObject, ObjectHolder[build.IncludeDirs]):
-
-    def __init__(self, obj: build.InstallDir):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, obj)
-
-class ManHolder(InterpreterObject, ObjectHolder[build.Man]):
-
-    def __init__(self, obj: build.Man):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, obj)
-
-    def get_custom_install_dir(self) -> T.Optional[str]:
-        return self.held_object.custom_install_dir
-
-    def get_custom_install_mode(self) -> T.Optional[FileMode]:
-        return self.held_object.custom_install_mode
-
-    def locale(self) -> T.Optional[str]:
-        return self.held_object.locale
-
-    def get_sources(self) -> T.List[mesonlib.File]:
-        return self.held_object.sources
-
-class GeneratedObjectsHolder(InterpreterObject, ObjectHolder[build.ExtractedObjects]):
-    def __init__(self, held_object: build.ExtractedObjects):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, held_object)
-
-
-_Target = T.TypeVar('_Target', bound=build.Target)
-
-
-class TargetHolder(InterpreterObject, ObjectHolder[_Target]):
-    def __init__(self, target: _Target, interp: 'Interpreter'):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, target, interp.subproject)
-        self.interpreter = interp
-
-
-_BuildTarget = T.TypeVar('_BuildTarget', bound=build.BuildTarget)
-
-class BuildTargetHolder(TargetHolder[_BuildTarget]):
-    def __init__(self, target: _BuildTarget, interp: 'Interpreter'):
-        super().__init__(target, interp)
-        self.methods.update({'extract_objects': self.extract_objects_method,
-                             'extract_all_objects': self.extract_all_objects_method,
-                             'name': self.name_method,
-                             'get_id': self.get_id_method,
-                             'outdir': self.outdir_method,
-                             'full_path': self.full_path_method,
-                             'private_dir_include': self.private_dir_include_method,
-                             })
-
-    def __repr__(self):
-        r = '<{} {}: {}>'
-        h = self.held_object
-        return r.format(self.__class__.__name__, h.get_id(), h.filename)
-
-    def is_cross(self):
-        return not self.held_object.environment.machines.matches_build_machine(self.held_object.for_machine)
-
-    @noPosargs
-    @permittedKwargs({})
-    def private_dir_include_method(self, args, kwargs):
-        return IncludeDirsHolder(build.IncludeDirs('', [], False,
-                                                   [self.interpreter.backend.get_target_private_dir(self.held_object)]))
-
-    @noPosargs
-    @permittedKwargs({})
-    def full_path_method(self, args, kwargs):
-        return self.interpreter.backend.get_target_filename_abs(self.held_object)
-
-    @noPosargs
-    @permittedKwargs({})
-    def outdir_method(self, args, kwargs):
-        return self.interpreter.backend.get_target_dir(self.held_object)
-
-    @permittedKwargs({})
-    def extract_objects_method(self, args, kwargs):
-        gobjs = self.held_object.extract_objects(args)
-        return GeneratedObjectsHolder(gobjs)
-
-    @FeatureNewKwargs('extract_all_objects', '0.46.0', ['recursive'])
-    @noPosargs
-    @permittedKwargs({'recursive'})
-    def extract_all_objects_method(self, args, kwargs):
-        recursive = kwargs.get('recursive', False)
-        gobjs = self.held_object.extract_all_objects(recursive)
-        if gobjs.objlist and 'recursive' not in kwargs:
-            mlog.warning('extract_all_objects called without setting recursive '
-                         'keyword argument. Meson currently defaults to '
-                         'non-recursive to maintain backward compatibility but '
-                         'the default will be changed in the future.',
-                         location=self.current_node)
-        return GeneratedObjectsHolder(gobjs)
-
-    @noPosargs
-    @permittedKwargs({})
-    def get_id_method(self, args, kwargs):
-        return self.held_object.get_id()
-
-    @FeatureNew('name', '0.54.0')
-    @noPosargs
-    @permittedKwargs({})
-    def name_method(self, args, kwargs):
-        return self.held_object.name
-
-class ExecutableHolder(BuildTargetHolder[build.Executable]):
-    pass
-
-class StaticLibraryHolder(BuildTargetHolder[build.StaticLibrary]):
-    pass
-
-class SharedLibraryHolder(BuildTargetHolder[build.SharedLibrary]):
-    def __init__(self, target: build.SharedLibrary, interp: 'Interpreter'):
-        super().__init__(target, interp)
-        # Set to True only when called from self.func_shared_lib().
-        target.shared_library_only = False
-
-class BothLibrariesHolder(BuildTargetHolder):
-    def __init__(self, shared_holder, static_holder, interp):
-        # FIXME: This build target always represents the shared library, but
-        # that should be configurable.
-        super().__init__(shared_holder.held_object, interp)
-        self.shared_holder = shared_holder
-        self.static_holder = static_holder
-        self.methods.update({'get_shared_lib': self.get_shared_lib_method,
-                             'get_static_lib': self.get_static_lib_method,
-                             })
-
-    def __repr__(self):
-        r = '<{} {}: {}, {}: {}>'
-        h1 = self.shared_holder.held_object
-        h2 = self.static_holder.held_object
-        return r.format(self.__class__.__name__, h1.get_id(), h1.filename, h2.get_id(), h2.filename)
-
-    @noPosargs
-    @permittedKwargs({})
-    def get_shared_lib_method(self, args, kwargs):
-        return self.shared_holder
-
-    @noPosargs
-    @permittedKwargs({})
-    def get_static_lib_method(self, args, kwargs):
-        return self.static_holder
-
-class SharedModuleHolder(BuildTargetHolder[build.SharedModule]):
-    pass
-
-class JarHolder(BuildTargetHolder[build.Jar]):
-    pass
-
-class CustomTargetIndexHolder(TargetHolder[build.CustomTargetIndex]):
-    def __init__(self, target: build.CustomTargetIndex, interp: 'Interpreter'):
-        super().__init__(target, interp)
-        self.methods.update({'full_path': self.full_path_method,
-                             })
-
-    @FeatureNew('custom_target[i].full_path', '0.54.0')
-    @noPosargs
-    @permittedKwargs({})
-    def full_path_method(self, args, kwargs):
-        return self.interpreter.backend.get_target_filename_abs(self.held_object)
-
-class CustomTargetHolder(TargetHolder):
-    def __init__(self, target: 'build.CustomTarget', interp: 'Interpreter'):
-        super().__init__(target, interp)
-        self.methods.update({'full_path': self.full_path_method,
-                             'to_list': self.to_list_method,
-                             })
-
-    def __repr__(self):
-        r = '<{} {}: {}>'
-        h = self.held_object
-        return r.format(self.__class__.__name__, h.get_id(), h.command)
-
-    @noPosargs
-    @permittedKwargs({})
-    def full_path_method(self, args, kwargs):
-        return self.interpreter.backend.get_target_filename_abs(self.held_object)
-
-    @FeatureNew('custom_target.to_list', '0.54.0')
-    @noPosargs
-    @permittedKwargs({})
-    def to_list_method(self, args, kwargs):
-        result = []
-        for i in self.held_object:
-            result.append(CustomTargetIndexHolder(i, self.interpreter))
-        return result
-
-    def __getitem__(self, index):
-        return CustomTargetIndexHolder(self.held_object[index], self.interpreter)
-
-    def __setitem__(self, index, value):  # lgtm[py/unexpected-raise-in-special-method]
-        raise InterpreterException('Cannot set a member of a CustomTarget')
-
-    def __delitem__(self, index):  # lgtm[py/unexpected-raise-in-special-method]
-        raise InterpreterException('Cannot delete a member of a CustomTarget')
-
-    def outdir_include(self):
-        return IncludeDirsHolder(build.IncludeDirs('', [], False,
-                                                   [os.path.join('@BUILD_ROOT@', self.interpreter.backend.get_target_dir(self.held_object))]))
-
-class RunTargetHolder(TargetHolder):
-    def __init__(self, target, interp):
-        super().__init__(target, interp)
-
-    def __repr__(self):
-        r = '<{} {}: {}>'
-        h = self.held_object
-        return r.format(self.__class__.__name__, h.get_id(), h.command)
-
-class Test(InterpreterObject):
-    def __init__(self, name: str, project: str, suite: T.List[str], exe: build.Executable,
-                 depends: T.List[T.Union[build.CustomTarget, build.BuildTarget]],
-                 is_parallel: bool, cmd_args: T.List[str], env: build.EnvironmentVariables,
-                 should_fail: bool, timeout: int, workdir: T.Optional[str], protocol: str,
-                 priority: int):
-        InterpreterObject.__init__(self)
-        self.name = name
-        self.suite = suite
-        self.project_name = project
-        self.exe = exe
-        self.depends = depends
-        self.is_parallel = is_parallel
-        self.cmd_args = cmd_args
-        self.env = env
-        self.should_fail = should_fail
-        self.timeout = timeout
-        self.workdir = workdir
-        self.protocol = TestProtocol.from_str(protocol)
-        self.priority = priority
-
-    def get_exe(self):
-        return self.exe
-
-    def get_name(self):
-        return self.name
-
-class SubprojectHolder(InterpreterObject, ObjectHolder[T.Optional['Interpreter']]):
-
-    def __init__(self, subinterpreter: T.Optional['Interpreter'], subdir: str, warnings=0, disabled_feature=None,
-                 exception=None):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, subinterpreter)
-        self.warnings = warnings
-        self.disabled_feature = disabled_feature
-        self.exception = exception
-        self.subdir = PurePath(subdir).as_posix()
-        self.methods.update({'get_variable': self.get_variable_method,
-                             'found': self.found_method,
-                             })
-
-    @noPosargs
-    @permittedKwargs({})
-    def found_method(self, args, kwargs):
-        return self.found()
-
-    def found(self):
-        return self.held_object is not None
-
-    @permittedKwargs({})
-    @noArgsFlattening
-    def get_variable_method(self, args, kwargs):
-        if len(args) < 1 or len(args) > 2:
-            raise InterpreterException('Get_variable takes one or two arguments.')
-        if not self.found():
-            raise InterpreterException('Subproject "%s" disabled can\'t get_variable on it.' % (self.subdir))
-        varname = args[0]
-        if not isinstance(varname, str):
-            raise InterpreterException('Get_variable first argument must be a string.')
-        try:
-            return self.held_object.variables[varname]
-        except KeyError:
-            pass
-
-        if len(args) == 2:
-            return args[1]
-
-        raise InvalidArguments(f'Requested variable "{varname}" not found.')
-
-header_permitted_kwargs = {
-    'required',
-    'prefix',
-    'no_builtin_args',
-    'include_directories',
-    'args',
-    'dependencies',
-}
-
-find_library_permitted_kwargs = {
-    'has_headers',
-    'required',
-    'dirs',
-    'static',
-}
-
-find_library_permitted_kwargs |= {'header_' + k for k in header_permitted_kwargs}
-
-class CompilerHolder(InterpreterObject):
-    def __init__(self, compiler: 'Compiler', env: 'Environment', subproject: str):
-        InterpreterObject.__init__(self)
-        self.compiler = compiler
-        self.environment = env
-        self.subproject = subproject
-        self.methods.update({'compiles': self.compiles_method,
-                             'links': self.links_method,
-                             'get_id': self.get_id_method,
-                             'get_linker_id': self.get_linker_id_method,
-                             'compute_int': self.compute_int_method,
-                             'sizeof': self.sizeof_method,
-                             'get_define': self.get_define_method,
-                             'check_header': self.check_header_method,
-                             'has_header': self.has_header_method,
-                             'has_header_symbol': self.has_header_symbol_method,
-                             'run': self.run_method,
-                             'has_function': self.has_function_method,
-                             'has_member': self.has_member_method,
-                             'has_members': self.has_members_method,
-                             'has_type': self.has_type_method,
-                             'alignment': self.alignment_method,
-                             'version': self.version_method,
-                             'cmd_array': self.cmd_array_method,
-                             'find_library': self.find_library_method,
-                             'has_argument': self.has_argument_method,
-                             'has_function_attribute': self.has_func_attribute_method,
-                             'get_supported_function_attributes': self.get_supported_function_attributes_method,
-                             'has_multi_arguments': self.has_multi_arguments_method,
-                             'get_supported_arguments': self.get_supported_arguments_method,
-                             'first_supported_argument': self.first_supported_argument_method,
-                             'has_link_argument': self.has_link_argument_method,
-                             'has_multi_link_arguments': self.has_multi_link_arguments_method,
-                             'get_supported_link_arguments': self.get_supported_link_arguments_method,
-                             'first_supported_link_argument': self.first_supported_link_argument_method,
-                             'unittest_args': self.unittest_args_method,
-                             'symbols_have_underscore_prefix': self.symbols_have_underscore_prefix_method,
-                             'get_argument_syntax': self.get_argument_syntax_method,
-                             })
-
-    def _dep_msg(self, deps, endl):
-        msg_single = 'with dependency {}'
-        msg_many = 'with dependencies {}'
-        if not deps:
-            return endl
-        if endl is None:
-            endl = ''
-        names = []
-        for d in deps:
-            if isinstance(d, dependencies.InternalDependency):
-                continue
-            if isinstance(d, dependencies.ExternalLibrary):
-                name = '-l' + d.name
-            else:
-                name = d.name
-            names.append(name)
-        if not names:
-            return None
-        tpl = msg_many if len(names) > 1 else msg_single
-        return tpl.format(', '.join(names)) + endl
-
-    @noPosargs
-    @permittedKwargs({})
-    def version_method(self, args, kwargs):
-        return self.compiler.version
-
-    @noPosargs
-    @permittedKwargs({})
-    def cmd_array_method(self, args, kwargs):
-        return self.compiler.exelist
-
-    def determine_args(self, kwargs, mode='link'):
-        nobuiltins = kwargs.get('no_builtin_args', False)
-        if not isinstance(nobuiltins, bool):
-            raise InterpreterException('Type of no_builtin_args not a boolean.')
-        args = []
-        incdirs = extract_as_list(kwargs, 'include_directories')
-        for i in incdirs:
-            if not isinstance(i, IncludeDirsHolder):
-                raise InterpreterException('Include directories argument must be an include_directories object.')
-            for idir in i.held_object.to_string_list(self.environment.get_source_dir()):
-                args += self.compiler.get_include_args(idir, False)
-        if not nobuiltins:
-            opts = self.environment.coredata.options
-            args += self.compiler.get_option_compile_args(opts)
-            if mode == 'link':
-                args += self.compiler.get_option_link_args(opts)
-        args += mesonlib.stringlistify(kwargs.get('args', []))
-        return args
-
-    def determine_dependencies(self, kwargs, endl=':'):
-        deps = kwargs.get('dependencies', None)
-        if deps is not None:
-            final_deps = []
-            while deps:
-                next_deps = []
-                for d in unholder(listify(deps)):
-                    if not isinstance(d, Dependency) or d.is_built():
-                        raise InterpreterException('Dependencies must be external dependencies')
-                    final_deps.append(d)
-                    next_deps.extend(d.ext_deps)
-                deps = next_deps
-            deps = final_deps
-        return deps, self._dep_msg(deps, endl)
-
-    @permittedKwargs({
-        'prefix',
-        'args',
-        'dependencies',
-    })
-    def alignment_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Alignment method takes exactly one positional argument.')
-        check_stringlist(args)
-        typename = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of alignment must be a string.')
-        extra_args = mesonlib.stringlistify(kwargs.get('args', []))
-        deps, msg = self.determine_dependencies(kwargs)
-        result = self.compiler.alignment(typename, prefix, self.environment,
-                                         extra_args=extra_args,
-                                         dependencies=deps)
-        mlog.log('Checking for alignment of', mlog.bold(typename, True), msg, result)
-        return result
-
-    @permittedKwargs({
-        'name',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def run_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Run method takes exactly one positional argument.')
-        code = args[0]
-        if isinstance(code, mesonlib.File):
-            code = mesonlib.File.from_absolute_file(
-                code.rel_to_builddir(self.environment.source_dir))
-        elif not isinstance(code, str):
-            raise InvalidArguments('Argument must be string or file.')
-        testname = kwargs.get('name', '')
-        if not isinstance(testname, str):
-            raise InterpreterException('Testname argument must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs, endl=None)
-        result = self.compiler.run(code, self.environment, extra_args=extra_args,
-                                   dependencies=deps)
-        if len(testname) > 0:
-            if not result.compiled:
-                h = mlog.red('DID NOT COMPILE')
-            elif result.returncode == 0:
-                h = mlog.green('YES')
-            else:
-                h = mlog.red('NO (%d)' % result.returncode)
-            mlog.log('Checking if', mlog.bold(testname, True), msg, 'runs:', h)
-        return TryRunResultHolder(result)
-
-    @noPosargs
-    @permittedKwargs({})
-    def get_id_method(self, args, kwargs):
-        return self.compiler.get_id()
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureNew('compiler.get_linker_id', '0.53.0')
-    def get_linker_id_method(self, args, kwargs):
-        return self.compiler.get_linker_id()
-
-    @noPosargs
-    @permittedKwargs({})
-    def symbols_have_underscore_prefix_method(self, args, kwargs):
-        '''
-        Check if the compiler prefixes _ (underscore) to global C symbols
-        See: https://en.wikipedia.org/wiki/Name_mangling#C
-        '''
-        return self.compiler.symbols_have_underscore_prefix(self.environment)
-
-    @noPosargs
-    @permittedKwargs({})
-    def unittest_args_method(self, args, kwargs):
-        '''
-        This function is deprecated and should not be used.
-        It can be removed in a future version of Meson.
-        '''
-        if not hasattr(self.compiler, 'get_feature_args'):
-            raise InterpreterException(f'This {self.compiler.get_display_language()} compiler has no feature arguments.')
-        build_to_src = os.path.relpath(self.environment.get_source_dir(), self.environment.get_build_dir())
-        return self.compiler.get_feature_args({'unittest': 'true'}, build_to_src)
-
-    @permittedKwargs({
-        'prefix',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def has_member_method(self, args, kwargs):
-        if len(args) != 2:
-            raise InterpreterException('Has_member takes exactly two arguments.')
-        check_stringlist(args)
-        typename, membername = args
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_member must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        had, cached = self.compiler.has_members(typename, [membername], prefix,
-                                                self.environment,
-                                                extra_args=extra_args,
-                                                dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if had:
-            hadtxt = mlog.green('YES')
-        else:
-            hadtxt = mlog.red('NO')
-        mlog.log('Checking whether type', mlog.bold(typename, True),
-                 'has member', mlog.bold(membername, True), msg, hadtxt, cached)
-        return had
-
-    @permittedKwargs({
-        'prefix',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def has_members_method(self, args, kwargs):
-        if len(args) < 2:
-            raise InterpreterException('Has_members needs at least two arguments.')
-        check_stringlist(args)
-        typename, *membernames = args
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_members must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        had, cached = self.compiler.has_members(typename, membernames, prefix,
-                                                self.environment,
-                                                extra_args=extra_args,
-                                                dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if had:
-            hadtxt = mlog.green('YES')
-        else:
-            hadtxt = mlog.red('NO')
-        members = mlog.bold(', '.join([f'"{m}"' for m in membernames]))
-        mlog.log('Checking whether type', mlog.bold(typename, True),
-                 'has members', members, msg, hadtxt, cached)
-        return had
-
-    @permittedKwargs({
-        'prefix',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def has_function_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Has_function takes exactly one argument.')
-        check_stringlist(args)
-        funcname = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_function must be a string.')
-        extra_args = self.determine_args(kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        had, cached = self.compiler.has_function(funcname, prefix, self.environment,
-                                                 extra_args=extra_args,
-                                                 dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if had:
-            hadtxt = mlog.green('YES')
-        else:
-            hadtxt = mlog.red('NO')
-        mlog.log('Checking for function', mlog.bold(funcname, True), msg, hadtxt, cached)
-        return had
-
-    @permittedKwargs({
-        'prefix',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def has_type_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Has_type takes exactly one argument.')
-        check_stringlist(args)
-        typename = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_type must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        had, cached = self.compiler.has_type(typename, prefix, self.environment,
-                                             extra_args=extra_args, dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if had:
-            hadtxt = mlog.green('YES')
-        else:
-            hadtxt = mlog.red('NO')
-        mlog.log('Checking for type', mlog.bold(typename, True), msg, hadtxt, cached)
-        return had
-
-    @FeatureNew('compiler.compute_int', '0.40.0')
-    @permittedKwargs({
-        'prefix',
-        'low',
-        'high',
-        'guess',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def compute_int_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Compute_int takes exactly one argument.')
-        check_stringlist(args)
-        expression = args[0]
-        prefix = kwargs.get('prefix', '')
-        low = kwargs.get('low', None)
-        high = kwargs.get('high', None)
-        guess = kwargs.get('guess', None)
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of compute_int must be a string.')
-        if low is not None and not isinstance(low, int):
-            raise InterpreterException('Low argument of compute_int must be an int.')
-        if high is not None and not isinstance(high, int):
-            raise InterpreterException('High argument of compute_int must be an int.')
-        if guess is not None and not isinstance(guess, int):
-            raise InterpreterException('Guess argument of compute_int must be an int.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        res = self.compiler.compute_int(expression, low, high, guess, prefix,
-                                        self.environment, extra_args=extra_args,
-                                        dependencies=deps)
-        mlog.log('Computing int of', mlog.bold(expression, True), msg, res)
-        return res
-
-    @permittedKwargs({
-        'prefix',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def sizeof_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Sizeof takes exactly one argument.')
-        check_stringlist(args)
-        element = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of sizeof must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        esize = self.compiler.sizeof(element, prefix, self.environment,
-                                     extra_args=extra_args, dependencies=deps)
-        mlog.log('Checking for size of', mlog.bold(element, True), msg, esize)
-        return esize
-
-    @FeatureNew('compiler.get_define', '0.40.0')
-    @permittedKwargs({
-        'prefix',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def get_define_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('get_define() takes exactly one argument.')
-        check_stringlist(args)
-        element = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of get_define() must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        value, cached = self.compiler.get_define(element, prefix, self.environment,
-                                                 extra_args=extra_args,
-                                                 dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        mlog.log('Fetching value of define', mlog.bold(element, True), msg, value, cached)
-        return value
-
-    @permittedKwargs({
-        'name',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def compiles_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('compiles method takes exactly one argument.')
-        code = args[0]
-        if isinstance(code, mesonlib.File):
-            code = mesonlib.File.from_absolute_file(
-                code.rel_to_builddir(self.environment.source_dir))
-        elif not isinstance(code, str):
-            raise InvalidArguments('Argument must be string or file.')
-        testname = kwargs.get('name', '')
-        if not isinstance(testname, str):
-            raise InterpreterException('Testname argument must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs, endl=None)
-        result, cached = self.compiler.compiles(code, self.environment,
-                                                extra_args=extra_args,
-                                                dependencies=deps)
-        if len(testname) > 0:
-            if result:
-                h = mlog.green('YES')
-            else:
-                h = mlog.red('NO')
-            cached = mlog.blue('(cached)') if cached else ''
-            mlog.log('Checking if', mlog.bold(testname, True), msg, 'compiles:', h, cached)
-        return result
-
-    @permittedKwargs({
-        'name',
-        'no_builtin_args',
-        'include_directories',
-        'args',
-        'dependencies',
-    })
-    def links_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('links method takes exactly one argument.')
-        code = args[0]
-        if isinstance(code, mesonlib.File):
-            code = mesonlib.File.from_absolute_file(
-                code.rel_to_builddir(self.environment.source_dir))
-        elif not isinstance(code, str):
-            raise InvalidArguments('Argument must be string or file.')
-        testname = kwargs.get('name', '')
-        if not isinstance(testname, str):
-            raise InterpreterException('Testname argument must be a string.')
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs, endl=None)
-        result, cached = self.compiler.links(code, self.environment,
-                                             extra_args=extra_args,
-                                             dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if len(testname) > 0:
-            if result:
-                h = mlog.green('YES')
-            else:
-                h = mlog.red('NO')
-            mlog.log('Checking if', mlog.bold(testname, True), msg, 'links:', h, cached)
-        return result
-
-    @FeatureNew('compiler.check_header', '0.47.0')
-    @FeatureNewKwargs('compiler.check_header', '0.50.0', ['required'])
-    @permittedKwargs(header_permitted_kwargs)
-    def check_header_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('check_header method takes exactly one argument.')
-        check_stringlist(args)
-        hname = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_header must be a string.')
-        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject, default=False)
-        if disabled:
-            mlog.log('Check usable header', mlog.bold(hname, True), 'skipped: feature', mlog.bold(feature), 'disabled')
-            return False
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        haz, cached = self.compiler.check_header(hname, prefix, self.environment,
-                                                 extra_args=extra_args,
-                                                 dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if required and not haz:
-            raise InterpreterException(f'{self.compiler.get_display_language()} header {hname!r} not usable')
-        elif haz:
-            h = mlog.green('YES')
-        else:
-            h = mlog.red('NO')
-        mlog.log('Check usable header', mlog.bold(hname, True), msg, h, cached)
-        return haz
-
-    @FeatureNewKwargs('compiler.has_header', '0.50.0', ['required'])
-    @permittedKwargs(header_permitted_kwargs)
-    def has_header_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('has_header method takes exactly one argument.')
-        check_stringlist(args)
-        hname = args[0]
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_header must be a string.')
-        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject, default=False)
-        if disabled:
-            mlog.log('Has header', mlog.bold(hname, True), 'skipped: feature', mlog.bold(feature), 'disabled')
-            return False
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        haz, cached = self.compiler.has_header(hname, prefix, self.environment,
-                                               extra_args=extra_args, dependencies=deps)
-        cached = mlog.blue('(cached)') if cached else ''
-        if required and not haz:
-            raise InterpreterException(f'{self.compiler.get_display_language()} header {hname!r} not found')
-        elif haz:
-            h = mlog.green('YES')
-        else:
-            h = mlog.red('NO')
-        mlog.log('Has header', mlog.bold(hname, True), msg, h, cached)
-        return haz
-
-    @FeatureNewKwargs('compiler.has_header_symbol', '0.50.0', ['required'])
-    @permittedKwargs(header_permitted_kwargs)
-    def has_header_symbol_method(self, args, kwargs):
-        if len(args) != 2:
-            raise InterpreterException('has_header_symbol method takes exactly two arguments.')
-        check_stringlist(args)
-        hname, symbol = args
-        prefix = kwargs.get('prefix', '')
-        if not isinstance(prefix, str):
-            raise InterpreterException('Prefix argument of has_header_symbol must be a string.')
-        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject, default=False)
-        if disabled:
-            mlog.log(f'Header <{hname}> has symbol', mlog.bold(symbol, True), 'skipped: feature', mlog.bold(feature), 'disabled')
-            return False
-        extra_args = functools.partial(self.determine_args, kwargs)
-        deps, msg = self.determine_dependencies(kwargs)
-        haz, cached = self.compiler.has_header_symbol(hname, symbol, prefix, self.environment,
-                                                      extra_args=extra_args,
-                                                      dependencies=deps)
-        if required and not haz:
-            raise InterpreterException(f'{self.compiler.get_display_language()} symbol {symbol} not found in header {hname}')
-        elif haz:
-            h = mlog.green('YES')
-        else:
-            h = mlog.red('NO')
-        cached = mlog.blue('(cached)') if cached else ''
-        mlog.log(f'Header <{hname}> has symbol', mlog.bold(symbol, True), msg, h, cached)
-        return haz
-
-    def notfound_library(self, libname):
-        lib = dependencies.ExternalLibrary(libname, None,
-                                           self.environment,
-                                           self.compiler.language,
-                                           silent=True)
-        return ExternalLibraryHolder(lib, self.subproject)
-
-    @FeatureNewKwargs('compiler.find_library', '0.51.0', ['static'])
-    @FeatureNewKwargs('compiler.find_library', '0.50.0', ['has_headers'])
-    @FeatureNewKwargs('compiler.find_library', '0.49.0', ['disabler'])
-    @disablerIfNotFound
-    @permittedKwargs(find_library_permitted_kwargs)
-    def find_library_method(self, args, kwargs):
-        # TODO add dependencies support?
-        if len(args) != 1:
-            raise InterpreterException('find_library method takes one argument.')
-        libname = args[0]
-        if not isinstance(libname, str):
-            raise InterpreterException('Library name not a string.')
-
-        disabled, required, feature = extract_required_kwarg(kwargs, self.subproject)
-        if disabled:
-            mlog.log('Library', mlog.bold(libname), 'skipped: feature', mlog.bold(feature), 'disabled')
-            return self.notfound_library(libname)
-
-        has_header_kwargs = {k[7:]: v for k, v in kwargs.items() if k.startswith('header_')}
-        has_header_kwargs['required'] = required
-        headers = mesonlib.stringlistify(kwargs.get('has_headers', []))
-        for h in headers:
-            if not self.has_header_method([h], has_header_kwargs):
-                return self.notfound_library(libname)
-
-        search_dirs = extract_search_dirs(kwargs)
-
-        libtype = mesonlib.LibType.PREFER_SHARED
-        if 'static' in kwargs:
-            if not isinstance(kwargs['static'], bool):
-                raise InterpreterException('static must be a boolean')
-            libtype = mesonlib.LibType.STATIC if kwargs['static'] else mesonlib.LibType.SHARED
-        linkargs = self.compiler.find_library(libname, self.environment, search_dirs, libtype)
-        if required and not linkargs:
-            if libtype == mesonlib.LibType.PREFER_SHARED:
-                libtype = 'shared or static'
-            else:
-                libtype = libtype.name.lower()
-            raise InterpreterException('{} {} library {!r} not found'
-                                       .format(self.compiler.get_display_language(),
-                                               libtype, libname))
-        lib = dependencies.ExternalLibrary(libname, linkargs, self.environment,
-                                           self.compiler.language)
-        return ExternalLibraryHolder(lib, self.subproject)
-
-    @permittedKwargs({})
-    def has_argument_method(self, args: T.Sequence[str], kwargs) -> bool:
-        args = mesonlib.stringlistify(args)
-        if len(args) != 1:
-            raise InterpreterException('has_argument takes exactly one argument.')
-        return self.has_multi_arguments_method(args, kwargs)
-
-    @permittedKwargs({})
-    def has_multi_arguments_method(self, args: T.Sequence[str], kwargs: dict):
-        args = mesonlib.stringlistify(args)
-        result, cached = self.compiler.has_multi_arguments(args, self.environment)
-        if result:
-            h = mlog.green('YES')
-        else:
-            h = mlog.red('NO')
-        cached = mlog.blue('(cached)') if cached else ''
-        mlog.log(
-            'Compiler for {} supports arguments {}:'.format(
-                self.compiler.get_display_language(), ' '.join(args)),
-            h, cached)
-        return result
-
-    @FeatureNew('compiler.get_supported_arguments', '0.43.0')
-    @permittedKwargs({})
-    def get_supported_arguments_method(self, args, kwargs):
-        args = mesonlib.stringlistify(args)
-        supported_args = []
-        for arg in args:
-            if self.has_argument_method(arg, kwargs):
-                supported_args.append(arg)
-        return supported_args
-
-    @permittedKwargs({})
-    def first_supported_argument_method(self, args: T.Sequence[str], kwargs: dict) -> T.List[str]:
-        for arg in mesonlib.stringlistify(args):
-            if self.has_argument_method(arg, kwargs):
-                mlog.log('First supported argument:', mlog.bold(arg))
-                return [arg]
-        mlog.log('First supported argument:', mlog.red('None'))
-        return []
-
-    @FeatureNew('compiler.has_link_argument', '0.46.0')
-    @permittedKwargs({})
-    def has_link_argument_method(self, args, kwargs):
-        args = mesonlib.stringlistify(args)
-        if len(args) != 1:
-            raise InterpreterException('has_link_argument takes exactly one argument.')
-        return self.has_multi_link_arguments_method(args, kwargs)
-
-    @FeatureNew('compiler.has_multi_link_argument', '0.46.0')
-    @permittedKwargs({})
-    def has_multi_link_arguments_method(self, args, kwargs):
-        args = mesonlib.stringlistify(args)
-        result, cached = self.compiler.has_multi_link_arguments(args, self.environment)
-        cached = mlog.blue('(cached)') if cached else ''
-        if result:
-            h = mlog.green('YES')
-        else:
-            h = mlog.red('NO')
-        mlog.log(
-            'Compiler for {} supports link arguments {}:'.format(
-                self.compiler.get_display_language(), ' '.join(args)),
-            h, cached)
-        return result
-
-    @FeatureNew('compiler.get_supported_link_arguments_method', '0.46.0')
-    @permittedKwargs({})
-    def get_supported_link_arguments_method(self, args, kwargs):
-        args = mesonlib.stringlistify(args)
-        supported_args = []
-        for arg in args:
-            if self.has_link_argument_method(arg, kwargs):
-                supported_args.append(arg)
-        return supported_args
-
-    @FeatureNew('compiler.first_supported_link_argument_method', '0.46.0')
-    @permittedKwargs({})
-    def first_supported_link_argument_method(self, args, kwargs):
-        for i in mesonlib.stringlistify(args):
-            if self.has_link_argument_method(i, kwargs):
-                mlog.log('First supported link argument:', mlog.bold(i))
-                return [i]
-        mlog.log('First supported link argument:', mlog.red('None'))
-        return []
-
-    @FeatureNew('compiler.has_function_attribute', '0.48.0')
-    @permittedKwargs({})
-    def has_func_attribute_method(self, args, kwargs):
-        args = mesonlib.stringlistify(args)
-        if len(args) != 1:
-            raise InterpreterException('has_func_attribute takes exactly one argument.')
-        result, cached = self.compiler.has_func_attribute(args[0], self.environment)
-        cached = mlog.blue('(cached)') if cached else ''
-        h = mlog.green('YES') if result else mlog.red('NO')
-        mlog.log('Compiler for {} supports function attribute {}:'.format(self.compiler.get_display_language(), args[0]), h, cached)
-        return result
-
-    @FeatureNew('compiler.get_supported_function_attributes', '0.48.0')
-    @permittedKwargs({})
-    def get_supported_function_attributes_method(self, args, kwargs):
-        args = mesonlib.stringlistify(args)
-        return [a for a in args if self.has_func_attribute_method(a, kwargs)]
-
-    @FeatureNew('compiler.get_argument_syntax_method', '0.49.0')
-    @noPosargs
-    @noKwargs
-    def get_argument_syntax_method(self, args, kwargs):
-        return self.compiler.get_argument_syntax()
-
-
-class ModuleObjectHolder(InterpreterObject, ObjectHolder['ModuleObject']):
-    def __init__(self, modobj: 'ModuleObject', interpreter: 'Interpreter'):
-        InterpreterObject.__init__(self)
-        ObjectHolder.__init__(self, modobj)
-        self.interpreter = interpreter
-
-    def method_call(self, method_name, args, kwargs):
-        modobj = self.held_object
-        method = modobj.methods.get(method_name)
-        if not method and not modobj.methods:
-            # FIXME: Port all modules to use the methods dict.
-            method = getattr(modobj, method_name, None)
-            if method_name.startswith('_'):
-                raise InvalidArguments(f'Method {method_name!r} is private.')
-        if not method:
-            raise InvalidCode('Unknown method "%s" in object.' % method_name)
-        if not getattr(method, 'no-args-flattening', False):
-            args = flatten(args)
-        state = ModuleState(self.interpreter)
-        # Many modules do for example self.interpreter.find_program_impl(),
-        # so we have to ensure they use the current interpreter and not the one
-        # that first imported that module, otherwise it will use outdated
-        # overrides.
-        modobj.interpreter = self.interpreter
-        if method_name in modobj.snippets:
-            ret = method(self.interpreter, state, args, kwargs)
-        else:
-            # This is not 100% reliable but we can't use hash()
-            # because the Build object contains dicts and lists.
-            num_targets = len(self.interpreter.build.targets)
-            ret = method(state, args, kwargs)
-            if num_targets != len(self.interpreter.build.targets):
-                raise InterpreterException('Extension module altered internal state illegally.')
-            if isinstance(ret, ModuleReturnValue):
-                self.interpreter.process_new_values(ret.new_objects)
-                ret = ret.return_value
-        return self.interpreter.holderify(ret)
-
-
 class Summary:
     def __init__(self, project_name, project_version):
         self.project_name = project_name
@@ -1871,357 +145,6 @@ class Summary:
             line_len += v_len
         mlog.log(*line, sep=list_sep)
 
-class MesonMain(InterpreterObject):
-    def __init__(self, build: 'build.Build', interpreter: 'Interpreter'):
-        InterpreterObject.__init__(self)
-        self.build = build
-        self.interpreter = interpreter
-        self.methods.update({'get_compiler': self.get_compiler_method,
-                             'is_cross_build': self.is_cross_build_method,
-                             'has_exe_wrapper': self.has_exe_wrapper_method,
-                             'can_run_host_binaries': self.can_run_host_binaries_method,
-                             'is_unity': self.is_unity_method,
-                             'is_subproject': self.is_subproject_method,
-                             'current_source_dir': self.current_source_dir_method,
-                             'current_build_dir': self.current_build_dir_method,
-                             'source_root': self.source_root_method,
-                             'build_root': self.build_root_method,
-                             'project_source_root': self.project_source_root_method,
-                             'project_build_root': self.project_build_root_method,
-                             'add_install_script': self.add_install_script_method,
-                             'add_postconf_script': self.add_postconf_script_method,
-                             'add_dist_script': self.add_dist_script_method,
-                             'install_dependency_manifest': self.install_dependency_manifest_method,
-                             'override_dependency': self.override_dependency_method,
-                             'override_find_program': self.override_find_program_method,
-                             'project_version': self.project_version_method,
-                             'project_license': self.project_license_method,
-                             'version': self.version_method,
-                             'project_name': self.project_name_method,
-                             'get_cross_property': self.get_cross_property_method,
-                             'get_external_property': self.get_external_property_method,
-                             'has_external_property': self.has_external_property_method,
-                             'backend': self.backend_method,
-                             'add_devenv': self.add_devenv_method,
-                             })
-
-    def _find_source_script(self, prog: T.Union[str, mesonlib.File, ExecutableHolder], args):
-        
-        if isinstance(prog, (ExecutableHolder, ExternalProgramHolder)):
-            return self.interpreter.backend.get_executable_serialisation([unholder(prog)] + args)
-        found = self.interpreter.func_find_program({}, prog, {}).held_object
-        es = self.interpreter.backend.get_executable_serialisation([found] + args)
-        es.subproject = self.interpreter.subproject
-        return es
-
-    def _process_script_args(
-            self, name: str, args: T.List[T.Union[
-                str, mesonlib.File, CustomTargetHolder,
-                CustomTargetIndexHolder,
-                ExternalProgramHolder, ExecutableHolder,
-            ]], allow_built: bool = False) -> T.List[str]:
-        script_args = []  # T.List[str]
-        new = False
-        for a in args:
-            a = unholder(a)
-            if isinstance(a, str):
-                script_args.append(a)
-            elif isinstance(a, mesonlib.File):
-                new = True
-                script_args.append(a.rel_to_builddir(self.interpreter.environment.source_dir))
-            elif isinstance(a, (build.BuildTarget, build.CustomTarget, build.CustomTargetIndex)):
-                if not allow_built:
-                    raise InterpreterException(f'Arguments to {name} cannot be built')
-                new = True
-                script_args.extend([os.path.join(a.get_subdir(), o) for o in a.get_outputs()])
-
-                # This feels really hacky, but I'm not sure how else to fix
-                # this without completely rewriting install script handling.
-                # This is complicated by the fact that the install target
-                # depends on all.
-                if isinstance(a, build.CustomTargetIndex):
-                    a.target.build_by_default = True
-                else:
-                    a.build_by_default = True
-            elif isinstance(a, ExternalProgram):
-                script_args.extend(a.command)
-                new = True
-            else:
-                raise InterpreterException(
-                    'Arguments to {} must be strings, Files, or CustomTargets, '
-                    'Indexes of CustomTargets'.format(name))
-        if new:
-            FeatureNew.single_use(
-                'Calling "{}" with File, CustomTaget, Index of CustomTarget, '
-                'Executable, or ExternalProgram'.format(name),
-                '0.55.0', self.interpreter.subproject)
-        return script_args
-
-    @FeatureNewKwargs('add_install_script', '0.57.0', ['skip_if_destdir'])
-    @permittedKwargs({'skip_if_destdir'})
-    def add_install_script_method(self, args: 'T.Tuple[T.Union[str, mesonlib.File, ExecutableHolder], T.Union[str, mesonlib.File, CustomTargetHolder, CustomTargetIndexHolder], ...]', kwargs):
-        if len(args) < 1:
-            raise InterpreterException('add_install_script takes one or more arguments')
-        if isinstance(args[0], mesonlib.File):
-            FeatureNew.single_use('Passing file object to script parameter of add_install_script',
-                                  '0.57.0', self.interpreter.subproject)
-        skip_if_destdir = kwargs.get('skip_if_destdir', False)
-        if not isinstance(skip_if_destdir, bool):
-            raise InterpreterException('skip_if_destdir keyword argument must be boolean')
-        script_args = self._process_script_args('add_install_script', args[1:], allow_built=True)
-        script = self._find_source_script(args[0], script_args)
-        script.skip_if_destdir = skip_if_destdir
-        self.build.install_scripts.append(script)
-
-    @permittedKwargs(set())
-    def add_postconf_script_method(self, args, kwargs):
-        if len(args) < 1:
-            raise InterpreterException('add_postconf_script takes one or more arguments')
-        if isinstance(args[0], mesonlib.File):
-            FeatureNew.single_use('Passing file object to script parameter of add_postconf_script',
-                                  '0.57.0', self.interpreter.subproject)
-        script_args = self._process_script_args('add_postconf_script', args[1:], allow_built=True)
-        script = self._find_source_script(args[0], script_args)
-        self.build.postconf_scripts.append(script)
-
-    @permittedKwargs(set())
-    def add_dist_script_method(self, args, kwargs):
-        if len(args) < 1:
-            raise InterpreterException('add_dist_script takes one or more arguments')
-        if len(args) > 1:
-            FeatureNew.single_use('Calling "add_dist_script" with multiple arguments',
-                                  '0.49.0', self.interpreter.subproject)
-        if isinstance(args[0], mesonlib.File):
-            FeatureNew.single_use('Passing file object to script parameter of add_dist_script',
-                                  '0.57.0', self.interpreter.subproject)
-        if self.interpreter.subproject != '':
-            FeatureNew.single_use('Calling "add_dist_script" in a subproject',
-                                  '0.58.0', self.interpreter.subproject)
-        script_args = self._process_script_args('add_dist_script', args[1:], allow_built=True)
-        script = self._find_source_script(args[0], script_args)
-        self.build.dist_scripts.append(script)
-
-    @noPosargs
-    @permittedKwargs({})
-    def current_source_dir_method(self, args, kwargs):
-        src = self.interpreter.environment.source_dir
-        sub = self.interpreter.subdir
-        if sub == '':
-            return src
-        return os.path.join(src, sub)
-
-    @noPosargs
-    @permittedKwargs({})
-    def current_build_dir_method(self, args, kwargs):
-        src = self.interpreter.environment.build_dir
-        sub = self.interpreter.subdir
-        if sub == '':
-            return src
-        return os.path.join(src, sub)
-
-    @noPosargs
-    @permittedKwargs({})
-    def backend_method(self, args, kwargs):
-        return self.interpreter.backend.name
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureDeprecated('meson.source_root', '0.56.0', 'use meson.current_source_dir instead.')
-    def source_root_method(self, args, kwargs):
-        return self.interpreter.environment.source_dir
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureDeprecated('meson.build_root', '0.56.0', 'use meson.current_build_dir instead.')
-    def build_root_method(self, args, kwargs):
-        return self.interpreter.environment.build_dir
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureNew('meson.project_source_root', '0.56.0')
-    def project_source_root_method(self, args, kwargs):
-        src = self.interpreter.environment.source_dir
-        sub = self.interpreter.root_subdir
-        if sub == '':
-            return src
-        return os.path.join(src, sub)
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureNew('meson.project_build_root', '0.56.0')
-    def project_build_root_method(self, args, kwargs):
-        src = self.interpreter.environment.build_dir
-        sub = self.interpreter.root_subdir
-        if sub == '':
-            return src
-        return os.path.join(src, sub)
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureDeprecated('meson.has_exe_wrapper', '0.55.0', 'use meson.can_run_host_binaries instead.')
-    def has_exe_wrapper_method(self, args: T.Tuple[object, ...], kwargs: T.Dict[str, object]) -> bool:
-        return self.can_run_host_binaries_impl(args, kwargs)
-
-    @noPosargs
-    @permittedKwargs({})
-    @FeatureNew('meson.can_run_host_binaries', '0.55.0')
-    def can_run_host_binaries_method(self, args: T.Tuple[object, ...], kwargs: T.Dict[str, object]) -> bool:
-        return self.can_run_host_binaries_impl(args, kwargs)
-
-    def can_run_host_binaries_impl(self, args, kwargs):
-        if (self.is_cross_build_method(None, None) and
-                self.build.environment.need_exe_wrapper()):
-            if self.build.environment.exe_wrapper is None:
-                return False
-        # We return True when exe_wrap is defined, when it's not needed, and
-        # when we're compiling natively. The last two are semantically confusing.
-        # Need to revisit this.
-        return True
-
-    @noPosargs
-    @permittedKwargs({})
-    def is_cross_build_method(self, args, kwargs):
-        return self.build.environment.is_cross_build()
-
-    @permittedKwargs({'native'})
-    def get_compiler_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('get_compiler_method must have one and only one argument.')
-        cname = args[0]
-        for_machine = Interpreter.machine_from_native_kwarg(kwargs)
-        clist = self.interpreter.coredata.compilers[for_machine]
-        if cname in clist:
-            return CompilerHolder(clist[cname], self.build.environment, self.interpreter.subproject)
-        raise InterpreterException(f'Tried to access compiler for language "{cname}", not specified for {for_machine.get_lower_case_name()} machine.')
-
-    @noPosargs
-    @permittedKwargs({})
-    def is_unity_method(self, args, kwargs):
-        optval = self.interpreter.environment.coredata.get_option(OptionKey('unity'))
-        if optval == 'on' or (optval == 'subprojects' and self.interpreter.is_subproject()):
-            return True
-        return False
-
-    @noPosargs
-    @permittedKwargs({})
-    def is_subproject_method(self, args, kwargs):
-        return self.interpreter.is_subproject()
-
-    @permittedKwargs({})
-    def install_dependency_manifest_method(self, args, kwargs):
-        if len(args) != 1:
-            raise InterpreterException('Must specify manifest install file name')
-        if not isinstance(args[0], str):
-            raise InterpreterException('Argument must be a string.')
-        self.build.dep_manifest_name = args[0]
-
-    @FeatureNew('meson.override_find_program', '0.46.0')
-    @permittedKwargs({})
-    def override_find_program_method(self, args, kwargs):
-        if len(args) != 2:
-            raise InterpreterException('Override needs two arguments')
-        name, exe = args
-        if not isinstance(name, str):
-            raise InterpreterException('First argument must be a string')
-        exe = unholder(exe)
-        if isinstance(exe, mesonlib.File):
-            abspath = exe.absolute_path(self.interpreter.environment.source_dir,
-                                        self.interpreter.environment.build_dir)
-            if not os.path.exists(abspath):
-                raise InterpreterException('Tried to override %s with a file that does not exist.' % name)
-            exe = OverrideProgram(name, abspath)
-        if not isinstance(exe, (ExternalProgram, build.Executable)):
-            raise InterpreterException('Second argument must be an external program or executable.')
-        self.interpreter.add_find_program_override(name, exe)
-
-    @FeatureNew('meson.override_dependency', '0.54.0')
-    @permittedKwargs({'native'})
-    def override_dependency_method(self, args, kwargs):
-        if len(args) != 2:
-            raise InterpreterException('Override needs two arguments')
-        name = args[0]
-        dep = args[1]
-        if not isinstance(name, str) or not name:
-            raise InterpreterException('First argument must be a string and cannot be empty')
-        dep = unholder(dep)
-        if not isinstance(dep, dependencies.Dependency):
-            raise InterpreterException('Second argument must be a dependency object')
-        identifier = dependencies.get_dep_identifier(name, kwargs)
-        for_machine = self.interpreter.machine_from_native_kwarg(kwargs)
-        override = self.build.dependency_overrides[for_machine].get(identifier)
-        if override:
-            m = 'Tried to override dependency {!r} which has already been resolved or overridden at {}'
-            location = mlog.get_error_location_string(override.node.filename, override.node.lineno)
-            raise InterpreterException(m.format(name, location))
-        self.build.dependency_overrides[for_machine][identifier] = \
-            build.DependencyOverride(dep, self.interpreter.current_node)
-
-    @noPosargs
-    @permittedKwargs({})
-    def project_version_method(self, args, kwargs):
-        return self.build.dep_manifest[self.interpreter.active_projectname]['version']
-
-    @FeatureNew('meson.project_license()', '0.45.0')
-    @noPosargs
-    @permittedKwargs({})
-    def project_license_method(self, args, kwargs):
-        return self.build.dep_manifest[self.interpreter.active_projectname]['license']
-
-    @noPosargs
-    @permittedKwargs({})
-    def version_method(self, args, kwargs):
-        return MesonVersionString(coredata.version)
-
-    @noPosargs
-    @permittedKwargs({})
-    def project_name_method(self, args, kwargs):
-        return self.interpreter.active_projectname
-
-    def __get_external_property_impl(self, propname: str, fallback: T.Optional[object], machine: MachineChoice) -> object:
-        """Shared implementation for get_cross_property and get_external_property."""
-        try:
-            return self.interpreter.environment.properties[machine][propname]
-        except KeyError:
-            if fallback is not None:
-                return fallback
-            raise InterpreterException(f'Unknown property for {machine.get_lower_case_name()} machine: {propname}')
-
-    @noArgsFlattening
-    @permittedKwargs({})
-    @FeatureDeprecated('meson.get_cross_property', '0.58.0', 'Use meson.get_external_property() instead')
-    @typed_pos_args('meson.get_cross_property', str, optargs=[object])
-    def get_cross_property_method(self, args: T.Tuple[str, T.Optional[object]], kwargs: T.Dict[str, T.Any]) -> object:
-        propname, fallback = args
-        return self.__get_external_property_impl(propname, fallback, MachineChoice.HOST)
-
-    @noArgsFlattening
-    @permittedKwargs({'native'})
-    @FeatureNew('meson.get_external_property', '0.54.0')
-    @typed_pos_args('meson.get_external_property', str, optargs=[object])
-    def get_external_property_method(self, args: T.Tuple[str, T.Optional[object]], kwargs: T.Dict[str, T.Any]) -> object:
-        propname, fallback = args
-        machine = self.interpreter.machine_from_native_kwarg(kwargs)
-        return self.__get_external_property_impl(propname, fallback, machine)
-
-
-    @permittedKwargs({'native'})
-    @FeatureNew('meson.has_external_property', '0.58.0')
-    @typed_pos_args('meson.has_external_property', str)
-    def has_external_property_method(self, args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> str:
-        prop_name = args[0]
-        for_machine = self.interpreter.machine_from_native_kwarg(kwargs)
-        return prop_name in self.interpreter.environment.properties[for_machine]
-
-    @FeatureNew('add_devenv', '0.58.0')
-    @noKwargs
-    @typed_pos_args('add_devenv', (str, list, dict, EnvironmentVariablesHolder))
-    def add_devenv_method(self, args: T.Union[str, list, dict, EnvironmentVariablesHolder], kwargs: T.Dict[str, T.Any]) -> None:
-        env = args[0]
-        if isinstance(env, (str, list, dict)):
-            env = EnvironmentVariablesHolder(env)
-        self.build.devenv.append(env.held_object)
-
-
 known_library_kwargs = (
     build.known_shlib_kwargs |
     build.known_stlib_kwargs
@@ -2721,7 +644,7 @@ external dependencies (including libraries) must go to "dependencies".''')
             raise InterpreterException('Assert value not bool.')
         if not value:
             if message is None:
-                from .ast import AstPrinter
+                from ..ast import AstPrinter
                 printer = AstPrinter()
                 node.args.arguments[0].accept(printer)
                 message = printer.result
@@ -2953,7 +876,7 @@ external dependencies (including libraries) must go to "dependencies".''')
             new_build = self.build.copy()
             prefix = self.coredata.options[OptionKey('prefix')].value
 
-            from .modules.cmake import CMakeSubprojectOptions
+            from ..modules.cmake import CMakeSubprojectOptions
             options = kwargs.get('options', CMakeSubprojectOptions())
             if not isinstance(options, CMakeSubprojectOptions):
                 raise InterpreterException('"options" kwarg must be CMakeSubprojectOptions'
@@ -2973,7 +896,7 @@ external dependencies (including libraries) must go to "dependencies".''')
                 mlog.log('Processing generated meson AST')
 
                 # Debug print the generated meson file
-                from .ast import AstIndentationGenerator, AstPrinter
+                from ..ast import AstIndentationGenerator, AstPrinter
                 printer = AstPrinter()
                 ast.accept(AstIndentationGenerator())
                 ast.accept(printer)
@@ -3061,7 +984,7 @@ external dependencies (including libraries) must go to "dependencies".''')
         if self.backend is not None:
             return
         backend = self.coredata.get_option(OptionKey('backend'))
-        from .backend import backends
+        from ..backend import backends
         self.backend = backends.get_backend_from_name(backend, self.build, self)
 
         if self.backend is None:
diff --git a/mesonbuild/interpreter/interpreterobjects.py b/mesonbuild/interpreter/interpreterobjects.py
new file mode 100644
index 0000000..7d43752
--- /dev/null
+++ b/mesonbuild/interpreter/interpreterobjects.py
@@ -0,0 +1,999 @@
+import os
+import shlex
+import subprocess
+import re
+
+from pathlib import Path, PurePath
+
+from .. import mesonlib
+from .. import coredata
+from .. import build
+from .. import mlog
+
+from ..modules import ModuleReturnValue, ModuleObject, ModuleState
+from ..backend.backends import TestProtocol
+from ..interpreterbase import (InterpreterObject, ObjectHolder, MutableInterpreterObject,
+                               FeatureNewKwargs, FeatureNew, FeatureDeprecated,
+                               typed_pos_args, stringArgs, permittedKwargs,
+                               noArgsFlattening, noPosargs, TYPE_var, TYPE_nkwargs,
+                               flatten, InterpreterException, InvalidArguments, InvalidCode)
+from ..dependencies import Dependency, ExternalLibrary, InternalDependency
+from ..programs import ExternalProgram
+from ..mesonlib import FileMode, OptionKey, listify, Popen_safe
+
+import typing as T
+
+def extract_required_kwarg(kwargs, subproject, feature_check=None, default=True):
+    val = kwargs.get('required', default)
+    disabled = False
+    required = False
+    feature = None
+    if isinstance(val, FeatureOptionHolder):
+        if not feature_check:
+            feature_check = FeatureNew('User option "feature"', '0.47.0')
+        feature_check.use(subproject)
+        option = val.held_object
+        feature = val.name
+        if option.is_disabled():
+            disabled = True
+        elif option.is_enabled():
+            required = True
+    elif isinstance(val, bool):
+        required = val
+    else:
+        raise InterpreterException('required keyword argument must be boolean or a feature option')
+
+    # Keep boolean value in kwargs to simplify other places where this kwarg is
+    # checked.
+    kwargs['required'] = required
+
+    return disabled, required, feature
+
+def extract_search_dirs(kwargs):
+    search_dirs = mesonlib.stringlistify(kwargs.get('dirs', []))
+    search_dirs = [Path(d).expanduser() for d in search_dirs]
+    for d in search_dirs:
+        if mesonlib.is_windows() and d.root.startswith('\\'):
+            # a Unix-path starting with `/` that is not absolute on Windows.
+            # discard without failing for end-user ease of cross-platform directory arrays
+            continue
+        if not d.is_absolute():
+            raise InvalidCode(f'Search directory {d} is not an absolute path.')
+    return list(map(str, search_dirs))
+
+class FeatureOptionHolder(InterpreterObject, ObjectHolder[coredata.UserFeatureOption]):
+    def __init__(self, env: 'Environment', name: str, option: coredata.UserFeatureOption):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, option)
+        if option.is_auto():
+            # TODO: we need to case here because options is not a TypedDict
+            self.held_object = T.cast(coredata.UserFeatureOption, env.coredata.options[OptionKey('auto_features')])
+        self.name = name
+        self.methods.update({'enabled': self.enabled_method,
+                             'disabled': self.disabled_method,
+                             'auto': self.auto_method,
+                             })
+
+    @noPosargs
+    @permittedKwargs({})
+    def enabled_method(self, args, kwargs):
+        return self.held_object.is_enabled()
+
+    @noPosargs
+    @permittedKwargs({})
+    def disabled_method(self, args, kwargs):
+        return self.held_object.is_disabled()
+
+    @noPosargs
+    @permittedKwargs({})
+    def auto_method(self, args, kwargs):
+        return self.held_object.is_auto()
+
+class RunProcess(InterpreterObject):
+
+    def __init__(self, cmd, args, env, source_dir, build_dir, subdir, mesonintrospect, in_builddir=False, check=False, capture=True):
+        super().__init__()
+        if not isinstance(cmd, ExternalProgram):
+            raise AssertionError('BUG: RunProcess must be passed an ExternalProgram')
+        self.capture = capture
+        pc, self.stdout, self.stderr = self.run_command(cmd, args, env, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check)
+        self.returncode = pc.returncode
+        self.methods.update({'returncode': self.returncode_method,
+                             'stdout': self.stdout_method,
+                             'stderr': self.stderr_method,
+                             })
+
+    def run_command(self, cmd, args, env, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check=False):
+        command_array = cmd.get_command() + args
+        menv = {'MESON_SOURCE_ROOT': source_dir,
+                'MESON_BUILD_ROOT': build_dir,
+                'MESON_SUBDIR': subdir,
+                'MESONINTROSPECT': ' '.join([shlex.quote(x) for x in mesonintrospect]),
+                }
+        if in_builddir:
+            cwd = os.path.join(build_dir, subdir)
+        else:
+            cwd = os.path.join(source_dir, subdir)
+        child_env = os.environ.copy()
+        child_env.update(menv)
+        child_env = env.get_env(child_env)
+        stdout = subprocess.PIPE if self.capture else subprocess.DEVNULL
+        mlog.debug('Running command:', ' '.join(command_array))
+        try:
+            p, o, e = Popen_safe(command_array, stdout=stdout, env=child_env, cwd=cwd)
+            if self.capture:
+                mlog.debug('--- stdout ---')
+                mlog.debug(o)
+            else:
+                o = ''
+                mlog.debug('--- stdout disabled ---')
+            mlog.debug('--- stderr ---')
+            mlog.debug(e)
+            mlog.debug('')
+
+            if check and p.returncode != 0:
+                raise InterpreterException('Command "{}" failed with status {}.'.format(' '.join(command_array), p.returncode))
+
+            return p, o, e
+        except FileNotFoundError:
+            raise InterpreterException('Could not execute command "%s".' % ' '.join(command_array))
+
+    @noPosargs
+    @permittedKwargs({})
+    def returncode_method(self, args, kwargs):
+        return self.returncode
+
+    @noPosargs
+    @permittedKwargs({})
+    def stdout_method(self, args, kwargs):
+        return self.stdout
+
+    @noPosargs
+    @permittedKwargs({})
+    def stderr_method(self, args, kwargs):
+        return self.stderr
+
+class EnvironmentVariablesHolder(MutableInterpreterObject, ObjectHolder[build.EnvironmentVariables]):
+    def __init__(self, initial_values=None, subproject: str = ''):
+        MutableInterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, build.EnvironmentVariables(), subproject)
+        self.methods.update({'set': self.set_method,
+                             'append': self.append_method,
+                             'prepend': self.prepend_method,
+                             })
+        if isinstance(initial_values, dict):
+            for k, v in initial_values.items():
+                self.set_method([k, v], {})
+        elif initial_values is not None:
+            for e in mesonlib.stringlistify(initial_values):
+                if '=' not in e:
+                    raise InterpreterException('Env var definition must be of type key=val.')
+                (k, val) = e.split('=', 1)
+                k = k.strip()
+                val = val.strip()
+                if ' ' in k:
+                    raise InterpreterException('Env var key must not have spaces in it.')
+                self.set_method([k, val], {})
+
+    def __repr__(self) -> str:
+        repr_str = "<{0}: {1}>"
+        return repr_str.format(self.__class__.__name__, self.held_object.envvars)
+
+    def unpack_separator(self, kwargs: T.Dict[str, T.Any]) -> str:
+        separator = kwargs.get('separator', os.pathsep)
+        if not isinstance(separator, str):
+            raise InterpreterException("EnvironmentVariablesHolder methods 'separator'"
+                                       " argument needs to be a string.")
+        return separator
+
+    def warn_if_has_name(self, name: str) -> None:
+        # Multiple append/prepend operations was not supported until 0.58.0.
+        if self.held_object.has_name(name):
+            m = f'Overriding previous value of environment variable {name!r} with a new one'
+            FeatureNew('0.58.0', m).use(self.subproject)
+
+    @stringArgs
+    @permittedKwargs({'separator'})
+    @typed_pos_args('environment.set', str, varargs=str, min_varargs=1)
+    def set_method(self, args: T.Tuple[str, T.List[str]], kwargs: T.Dict[str, T.Any]) -> None:
+        name, values = args
+        separator = self.unpack_separator(kwargs)
+        self.held_object.set(name, values, separator)
+
+    @stringArgs
+    @permittedKwargs({'separator'})
+    @typed_pos_args('environment.append', str, varargs=str, min_varargs=1)
+    def append_method(self, args: T.Tuple[str, T.List[str]], kwargs: T.Dict[str, T.Any]) -> None:
+        name, values = args
+        separator = self.unpack_separator(kwargs)
+        self.warn_if_has_name(name)
+        self.held_object.append(name, values, separator)
+
+    @stringArgs
+    @permittedKwargs({'separator'})
+    @typed_pos_args('environment.prepend', str, varargs=str, min_varargs=1)
+    def prepend_method(self, args: T.Tuple[str, T.List[str]], kwargs: T.Dict[str, T.Any]) -> None:
+        name, values = args
+        separator = self.unpack_separator(kwargs)
+        self.warn_if_has_name(name)
+        self.held_object.prepend(name, values, separator)
+
+
+class ConfigurationDataHolder(MutableInterpreterObject, ObjectHolder[build.ConfigurationData]):
+    def __init__(self, pv, initial_values=None):
+        MutableInterpreterObject.__init__(self)
+        self.used = False # These objects become immutable after use in configure_file.
+        ObjectHolder.__init__(self, build.ConfigurationData(), pv)
+        self.methods.update({'set': self.set_method,
+                             'set10': self.set10_method,
+                             'set_quoted': self.set_quoted_method,
+                             'has': self.has_method,
+                             'get': self.get_method,
+                             'keys': self.keys_method,
+                             'get_unquoted': self.get_unquoted_method,
+                             'merge_from': self.merge_from_method,
+                             })
+        if isinstance(initial_values, dict):
+            for k, v in initial_values.items():
+                self.set_method([k, v], {})
+        elif initial_values:
+            raise AssertionError('Unsupported ConfigurationDataHolder initial_values')
+
+    def is_used(self):
+        return self.used
+
+    def mark_used(self):
+        self.used = True
+
+    def validate_args(self, args, kwargs):
+        if len(args) == 1 and isinstance(args[0], list) and len(args[0]) == 2:
+            mlog.deprecation('Passing a list as the single argument to '
+                             'configuration_data.set is deprecated. This will '
+                             'become a hard error in the future.',
+                             location=self.current_node)
+            args = args[0]
+
+        if len(args) != 2:
+            raise InterpreterException("Configuration set requires 2 arguments.")
+        if self.used:
+            raise InterpreterException("Can not set values on configuration object that has been used.")
+        name, val = args
+        if not isinstance(val, (int, str)):
+            msg = 'Setting a configuration data value to {!r} is invalid, ' \
+                  'and will fail at configure_file(). If you are using it ' \
+                  'just to store some values, please use a dict instead.'
+            mlog.deprecation(msg.format(val), location=self.current_node)
+        desc = kwargs.get('description', None)
+        if not isinstance(name, str):
+            raise InterpreterException("First argument to set must be a string.")
+        if desc is not None and not isinstance(desc, str):
+            raise InterpreterException('Description must be a string.')
+
+        return name, val, desc
+
+    @noArgsFlattening
+    def set_method(self, args, kwargs):
+        (name, val, desc) = self.validate_args(args, kwargs)
+        self.held_object.values[name] = (val, desc)
+
+    def set_quoted_method(self, args, kwargs):
+        (name, val, desc) = self.validate_args(args, kwargs)
+        if not isinstance(val, str):
+            raise InterpreterException("Second argument to set_quoted must be a string.")
+        escaped_val = '\\"'.join(val.split('"'))
+        self.held_object.values[name] = ('"' + escaped_val + '"', desc)
+
+    def set10_method(self, args, kwargs):
+        (name, val, desc) = self.validate_args(args, kwargs)
+        if val:
+            self.held_object.values[name] = (1, desc)
+        else:
+            self.held_object.values[name] = (0, desc)
+
+    def has_method(self, args, kwargs):
+        return args[0] in self.held_object.values
+
+    @FeatureNew('configuration_data.get()', '0.38.0')
+    @noArgsFlattening
+    def get_method(self, args, kwargs):
+        if len(args) < 1 or len(args) > 2:
+            raise InterpreterException('Get method takes one or two arguments.')
+        name = args[0]
+        if name in self.held_object:
+            return self.held_object.get(name)[0]
+        if len(args) > 1:
+            return args[1]
+        raise InterpreterException('Entry %s not in configuration data.' % name)
+
+    @FeatureNew('configuration_data.get_unquoted()', '0.44.0')
+    def get_unquoted_method(self, args, kwargs):
+        if len(args) < 1 or len(args) > 2:
+            raise InterpreterException('Get method takes one or two arguments.')
+        name = args[0]
+        if name in self.held_object:
+            val = self.held_object.get(name)[0]
+        elif len(args) > 1:
+            val = args[1]
+        else:
+            raise InterpreterException('Entry %s not in configuration data.' % name)
+        if val[0] == '"' and val[-1] == '"':
+            return val[1:-1]
+        return val
+
+    def get(self, name):
+        return self.held_object.values[name] # (val, desc)
+
+    @FeatureNew('configuration_data.keys()', '0.57.0')
+    @noPosargs
+    def keys_method(self, args, kwargs):
+        return sorted(self.keys())
+
+    def keys(self):
+        return self.held_object.values.keys()
+
+    def merge_from_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Merge_from takes one positional argument.')
+        from_object = args[0]
+        if not isinstance(from_object, ConfigurationDataHolder):
+            raise InterpreterException('Merge_from argument must be a configuration data object.')
+        from_object = from_object.held_object
+        for k, v in from_object.values.items():
+            self.held_object.values[k] = v
+
+permitted_partial_dependency_kwargs = {
+    'compile_args', 'link_args', 'links', 'includes', 'sources'
+}
+
+class DependencyHolder(InterpreterObject, ObjectHolder[Dependency]):
+    def __init__(self, dep: Dependency, pv: str):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, dep, pv)
+        self.methods.update({'found': self.found_method,
+                             'type_name': self.type_name_method,
+                             'version': self.version_method,
+                             'name': self.name_method,
+                             'get_pkgconfig_variable': self.pkgconfig_method,
+                             'get_configtool_variable': self.configtool_method,
+                             'get_variable': self.variable_method,
+                             'partial_dependency': self.partial_dependency_method,
+                             'include_type': self.include_type_method,
+                             'as_system': self.as_system_method,
+                             'as_link_whole': self.as_link_whole_method,
+                             })
+
+    def found(self):
+        return self.found_method([], {})
+
+    @noPosargs
+    @permittedKwargs({})
+    def type_name_method(self, args, kwargs):
+        return self.held_object.type_name
+
+    @noPosargs
+    @permittedKwargs({})
+    def found_method(self, args, kwargs):
+        if self.held_object.type_name == 'internal':
+            return True
+        return self.held_object.found()
+
+    @noPosargs
+    @permittedKwargs({})
+    def version_method(self, args, kwargs):
+        return self.held_object.get_version()
+
+    @noPosargs
+    @permittedKwargs({})
+    def name_method(self, args, kwargs):
+        return self.held_object.get_name()
+
+    @FeatureDeprecated('Dependency.get_pkgconfig_variable', '0.56.0',
+                       'use Dependency.get_variable(pkgconfig : ...) instead')
+    @permittedKwargs({'define_variable', 'default'})
+    def pkgconfig_method(self, args, kwargs):
+        args = listify(args)
+        if len(args) != 1:
+            raise InterpreterException('get_pkgconfig_variable takes exactly one argument.')
+        varname = args[0]
+        if not isinstance(varname, str):
+            raise InterpreterException('Variable name must be a string.')
+        return self.held_object.get_pkgconfig_variable(varname, kwargs)
+
+    @FeatureNew('dep.get_configtool_variable', '0.44.0')
+    @FeatureDeprecated('Dependency.get_configtool_variable', '0.56.0',
+                       'use Dependency.get_variable(configtool : ...) instead')
+    @permittedKwargs({})
+    def configtool_method(self, args, kwargs):
+        args = listify(args)
+        if len(args) != 1:
+            raise InterpreterException('get_configtool_variable takes exactly one argument.')
+        varname = args[0]
+        if not isinstance(varname, str):
+            raise InterpreterException('Variable name must be a string.')
+        return self.held_object.get_configtool_variable(varname)
+
+    @FeatureNew('dep.partial_dependency', '0.46.0')
+    @noPosargs
+    @permittedKwargs(permitted_partial_dependency_kwargs)
+    def partial_dependency_method(self, args, kwargs):
+        pdep = self.held_object.get_partial_dependency(**kwargs)
+        return DependencyHolder(pdep, self.subproject)
+
+    @FeatureNew('dep.get_variable', '0.51.0')
+    @typed_pos_args('dep.get_variable', optargs=[str])
+    @permittedKwargs({'cmake', 'pkgconfig', 'configtool', 'internal', 'default_value', 'pkgconfig_define'})
+    @FeatureNewKwargs('dep.get_variable', '0.54.0', ['internal'])
+    def variable_method(self, args: T.Tuple[T.Optional[str]], kwargs: T.Dict[str, T.Any]) -> str:
+        default_varname = args[0]
+        if default_varname is not None:
+            FeatureNew('0.58.0', 'Positional argument to dep.get_variable()').use(self.subproject)
+            for k in ['cmake', 'pkgconfig', 'configtool', 'internal']:
+                kwargs.setdefault(k, default_varname)
+        return self.held_object.get_variable(**kwargs)
+
+    @FeatureNew('dep.include_type', '0.52.0')
+    @noPosargs
+    @permittedKwargs({})
+    def include_type_method(self, args, kwargs):
+        return self.held_object.get_include_type()
+
+    @FeatureNew('dep.as_system', '0.52.0')
+    @permittedKwargs({})
+    def as_system_method(self, args, kwargs):
+        args = listify(args)
+        new_is_system = 'system'
+        if len(args) > 1:
+            raise InterpreterException('as_system takes only one optional value')
+        if len(args) == 1:
+            new_is_system = args[0]
+        new_dep = self.held_object.generate_system_dependency(new_is_system)
+        return DependencyHolder(new_dep, self.subproject)
+
+    @FeatureNew('dep.as_link_whole', '0.56.0')
+    @permittedKwargs({})
+    @noPosargs
+    def as_link_whole_method(self, args, kwargs):
+        if not isinstance(self.held_object, InternalDependency):
+            raise InterpreterException('as_link_whole method is only supported on declare_dependency() objects')
+        new_dep = self.held_object.generate_link_whole_dependency()
+        return DependencyHolder(new_dep, self.subproject)
+
+class ExternalProgramHolder(InterpreterObject, ObjectHolder[ExternalProgram]):
+    def __init__(self, ep: ExternalProgram, subproject: str, backend=None):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, ep)
+        self.subproject = subproject
+        self.backend = backend
+        self.methods.update({'found': self.found_method,
+                             'path': self.path_method,
+                             'full_path': self.full_path_method})
+        self.cached_version = None
+
+    @noPosargs
+    @permittedKwargs({})
+    def found_method(self, args, kwargs):
+        return self.found()
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureDeprecated('ExternalProgram.path', '0.55.0',
+                       'use ExternalProgram.full_path() instead')
+    def path_method(self, args, kwargs):
+        return self._full_path()
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureNew('ExternalProgram.full_path', '0.55.0')
+    def full_path_method(self, args, kwargs):
+        return self._full_path()
+
+    def _full_path(self):
+        exe = self.held_object
+        if isinstance(exe, build.Executable):
+            return self.backend.get_target_filename_abs(exe)
+        return exe.get_path()
+
+    def found(self):
+        return isinstance(self.held_object, build.Executable) or self.held_object.found()
+
+    def get_command(self):
+        return self.held_object.get_command()
+
+    def get_name(self):
+        exe = self.held_object
+        if isinstance(exe, build.Executable):
+            return exe.name
+        return exe.get_name()
+
+    def get_version(self, interpreter):
+        if isinstance(self.held_object, build.Executable):
+            return self.held_object.project_version
+        if not self.cached_version:
+            raw_cmd = self.get_command() + ['--version']
+            cmd = [self, '--version']
+            res = interpreter.run_command_impl(interpreter.current_node, cmd, {}, True)
+            if res.returncode != 0:
+                m = 'Running {!r} failed'
+                raise InterpreterException(m.format(raw_cmd))
+            output = res.stdout.strip()
+            if not output:
+                output = res.stderr.strip()
+            match = re.search(r'([0-9][0-9\.]+)', output)
+            if not match:
+                m = 'Could not find a version number in output of {!r}'
+                raise InterpreterException(m.format(raw_cmd))
+            self.cached_version = match.group(1)
+        return self.cached_version
+
+class ExternalLibraryHolder(InterpreterObject, ObjectHolder[ExternalLibrary]):
+    def __init__(self, el: ExternalLibrary, pv: str):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, el, pv)
+        self.methods.update({'found': self.found_method,
+                             'type_name': self.type_name_method,
+                             'partial_dependency': self.partial_dependency_method,
+                             })
+
+    def found(self):
+        return self.held_object.found()
+
+    @noPosargs
+    @permittedKwargs({})
+    def type_name_method(self, args, kwargs):
+        return self.held_object.type_name
+
+    @noPosargs
+    @permittedKwargs({})
+    def found_method(self, args, kwargs):
+        return self.found()
+
+    def get_name(self):
+        return self.held_object.name
+
+    def get_compile_args(self):
+        return self.held_object.get_compile_args()
+
+    def get_link_args(self):
+        return self.held_object.get_link_args()
+
+    def get_exe_args(self):
+        return self.held_object.get_exe_args()
+
+    @FeatureNew('dep.partial_dependency', '0.46.0')
+    @noPosargs
+    @permittedKwargs(permitted_partial_dependency_kwargs)
+    def partial_dependency_method(self, args, kwargs):
+        pdep = self.held_object.get_partial_dependency(**kwargs)
+        return DependencyHolder(pdep, self.subproject)
+
+class GeneratorHolder(InterpreterObject, ObjectHolder[build.Generator]):
+    @FeatureNewKwargs('generator', '0.43.0', ['capture'])
+    def __init__(self, interp, args, kwargs):
+        self.interpreter = interp
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, build.Generator(args, kwargs), interp.subproject)
+        self.methods.update({'process': self.process_method})
+
+    @FeatureNewKwargs('generator.process', '0.45.0', ['preserve_path_from'])
+    @permittedKwargs({'extra_args', 'preserve_path_from'})
+    def process_method(self, args, kwargs):
+        extras = mesonlib.stringlistify(kwargs.get('extra_args', []))
+        if 'preserve_path_from' in kwargs:
+            preserve_path_from = kwargs['preserve_path_from']
+            if not isinstance(preserve_path_from, str):
+                raise InvalidArguments('Preserve_path_from must be a string.')
+            preserve_path_from = os.path.normpath(preserve_path_from)
+            if not os.path.isabs(preserve_path_from):
+                # This is a bit of a hack. Fix properly before merging.
+                raise InvalidArguments('Preserve_path_from must be an absolute path for now. Sorry.')
+        else:
+            preserve_path_from = None
+        gl = self.held_object.process_files('Generator', args, self.interpreter,
+                                            preserve_path_from, extra_args=extras)
+        return GeneratedListHolder(gl)
+
+
+class GeneratedListHolder(InterpreterObject, ObjectHolder[build.GeneratedList]):
+    def __init__(self, arg1, extra_args=None):
+        InterpreterObject.__init__(self)
+        if isinstance(arg1, GeneratorHolder):
+            ObjectHolder.__init__(self, build.GeneratedList(arg1.held_object, extra_args if extra_args is not None else []))
+        else:
+            ObjectHolder.__init__(self, arg1)
+
+    def __repr__(self):
+        r = '<{}: {!r}>'
+        return r.format(self.__class__.__name__, self.held_object.get_outputs())
+
+    def add_file(self, a):
+        self.held_object.add_file(a)
+
+# A machine that's statically known from the cross file
+class MachineHolder(InterpreterObject, ObjectHolder['MachineInfo']):
+    def __init__(self, machine_info: 'MachineInfo'):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, machine_info)
+        self.methods.update({'system': self.system_method,
+                             'cpu': self.cpu_method,
+                             'cpu_family': self.cpu_family_method,
+                             'endian': self.endian_method,
+                             })
+
+    @noPosargs
+    @permittedKwargs({})
+    def cpu_family_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
+        return self.held_object.cpu_family
+
+    @noPosargs
+    @permittedKwargs({})
+    def cpu_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
+        return self.held_object.cpu
+
+    @noPosargs
+    @permittedKwargs({})
+    def system_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
+        return self.held_object.system
+
+    @noPosargs
+    @permittedKwargs({})
+    def endian_method(self, args: T.List[TYPE_var], kwargs: TYPE_nkwargs) -> str:
+        return self.held_object.endian
+
+class IncludeDirsHolder(InterpreterObject, ObjectHolder[build.IncludeDirs]):
+    def __init__(self, idobj: build.IncludeDirs):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, idobj)
+
+class HeadersHolder(InterpreterObject, ObjectHolder[build.Headers]):
+
+    def __init__(self, obj: build.Headers):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, obj)
+
+    def set_install_subdir(self, subdir):
+        self.held_object.install_subdir = subdir
+
+    def get_install_subdir(self):
+        return self.held_object.install_subdir
+
+    def get_sources(self):
+        return self.held_object.sources
+
+    def get_custom_install_dir(self):
+        return self.held_object.custom_install_dir
+
+    def get_custom_install_mode(self):
+        return self.held_object.custom_install_mode
+
+class DataHolder(InterpreterObject, ObjectHolder[build.Data]):
+    def __init__(self, data: build.Data):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, data)
+
+    def get_source_subdir(self):
+        return self.held_object.source_subdir
+
+    def get_sources(self):
+        return self.held_object.sources
+
+    def get_install_dir(self):
+        return self.held_object.install_dir
+
+class InstallDirHolder(InterpreterObject, ObjectHolder[build.IncludeDirs]):
+
+    def __init__(self, obj: build.InstallDir):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, obj)
+
+class ManHolder(InterpreterObject, ObjectHolder[build.Man]):
+
+    def __init__(self, obj: build.Man):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, obj)
+
+    def get_custom_install_dir(self) -> T.Optional[str]:
+        return self.held_object.custom_install_dir
+
+    def get_custom_install_mode(self) -> T.Optional[FileMode]:
+        return self.held_object.custom_install_mode
+
+    def locale(self) -> T.Optional[str]:
+        return self.held_object.locale
+
+    def get_sources(self) -> T.List[mesonlib.File]:
+        return self.held_object.sources
+
+class GeneratedObjectsHolder(InterpreterObject, ObjectHolder[build.ExtractedObjects]):
+    def __init__(self, held_object: build.ExtractedObjects):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, held_object)
+
+class Test(InterpreterObject):
+    def __init__(self, name: str, project: str, suite: T.List[str], exe: build.Executable,
+                 depends: T.List[T.Union[build.CustomTarget, build.BuildTarget]],
+                 is_parallel: bool, cmd_args: T.List[str], env: build.EnvironmentVariables,
+                 should_fail: bool, timeout: int, workdir: T.Optional[str], protocol: str,
+                 priority: int):
+        InterpreterObject.__init__(self)
+        self.name = name
+        self.suite = suite
+        self.project_name = project
+        self.exe = exe
+        self.depends = depends
+        self.is_parallel = is_parallel
+        self.cmd_args = cmd_args
+        self.env = env
+        self.should_fail = should_fail
+        self.timeout = timeout
+        self.workdir = workdir
+        self.protocol = TestProtocol.from_str(protocol)
+        self.priority = priority
+
+    def get_exe(self):
+        return self.exe
+
+    def get_name(self):
+        return self.name
+
+class SubprojectHolder(InterpreterObject, ObjectHolder[T.Optional['Interpreter']]):
+
+    def __init__(self, subinterpreter: T.Optional['Interpreter'], subdir: str, warnings=0, disabled_feature=None,
+                 exception=None):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, subinterpreter)
+        self.warnings = warnings
+        self.disabled_feature = disabled_feature
+        self.exception = exception
+        self.subdir = PurePath(subdir).as_posix()
+        self.methods.update({'get_variable': self.get_variable_method,
+                             'found': self.found_method,
+                             })
+
+    @noPosargs
+    @permittedKwargs({})
+    def found_method(self, args, kwargs):
+        return self.found()
+
+    def found(self):
+        return self.held_object is not None
+
+    @permittedKwargs({})
+    @noArgsFlattening
+    def get_variable_method(self, args, kwargs):
+        if len(args) < 1 or len(args) > 2:
+            raise InterpreterException('Get_variable takes one or two arguments.')
+        if not self.found():
+            raise InterpreterException('Subproject "%s" disabled can\'t get_variable on it.' % (self.subdir))
+        varname = args[0]
+        if not isinstance(varname, str):
+            raise InterpreterException('Get_variable first argument must be a string.')
+        try:
+            return self.held_object.variables[varname]
+        except KeyError:
+            pass
+
+        if len(args) == 2:
+            return args[1]
+
+        raise InvalidArguments(f'Requested variable "{varname}" not found.')
+
+class ModuleObjectHolder(InterpreterObject, ObjectHolder['ModuleObject']):
+    def __init__(self, modobj: 'ModuleObject', interpreter: 'Interpreter'):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, modobj)
+        self.interpreter = interpreter
+
+    def method_call(self, method_name, args, kwargs):
+        modobj = self.held_object
+        method = modobj.methods.get(method_name)
+        if not method and not modobj.methods:
+            # FIXME: Port all modules to use the methods dict.
+            method = getattr(modobj, method_name, None)
+            if method_name.startswith('_'):
+                raise InvalidArguments(f'Method {method_name!r} is private.')
+        if not method:
+            raise InvalidCode('Unknown method "%s" in object.' % method_name)
+        if not getattr(method, 'no-args-flattening', False):
+            args = flatten(args)
+        state = ModuleState(self.interpreter)
+        # Many modules do for example self.interpreter.find_program_impl(),
+        # so we have to ensure they use the current interpreter and not the one
+        # that first imported that module, otherwise it will use outdated
+        # overrides.
+        modobj.interpreter = self.interpreter
+        if method_name in modobj.snippets:
+            ret = method(self.interpreter, state, args, kwargs)
+        else:
+            # This is not 100% reliable but we can't use hash()
+            # because the Build object contains dicts and lists.
+            num_targets = len(self.interpreter.build.targets)
+            ret = method(state, args, kwargs)
+            if num_targets != len(self.interpreter.build.targets):
+                raise InterpreterException('Extension module altered internal state illegally.')
+            if isinstance(ret, ModuleReturnValue):
+                self.interpreter.process_new_values(ret.new_objects)
+                ret = ret.return_value
+        return self.interpreter.holderify(ret)
+
+_Target = T.TypeVar('_Target', bound=build.Target)
+
+
+class TargetHolder(InterpreterObject, ObjectHolder[_Target]):
+    def __init__(self, target: _Target, interp: 'Interpreter'):
+        InterpreterObject.__init__(self)
+        ObjectHolder.__init__(self, target, interp.subproject)
+        self.interpreter = interp
+
+
+_BuildTarget = T.TypeVar('_BuildTarget', bound=build.BuildTarget)
+
+class BuildTargetHolder(TargetHolder[_BuildTarget]):
+    def __init__(self, target: _BuildTarget, interp: 'Interpreter'):
+        super().__init__(target, interp)
+        self.methods.update({'extract_objects': self.extract_objects_method,
+                             'extract_all_objects': self.extract_all_objects_method,
+                             'name': self.name_method,
+                             'get_id': self.get_id_method,
+                             'outdir': self.outdir_method,
+                             'full_path': self.full_path_method,
+                             'private_dir_include': self.private_dir_include_method,
+                             })
+
+    def __repr__(self):
+        r = '<{} {}: {}>'
+        h = self.held_object
+        return r.format(self.__class__.__name__, h.get_id(), h.filename)
+
+    def is_cross(self):
+        return not self.held_object.environment.machines.matches_build_machine(self.held_object.for_machine)
+
+    @noPosargs
+    @permittedKwargs({})
+    def private_dir_include_method(self, args, kwargs):
+        return IncludeDirsHolder(build.IncludeDirs('', [], False,
+                                                   [self.interpreter.backend.get_target_private_dir(self.held_object)]))
+
+    @noPosargs
+    @permittedKwargs({})
+    def full_path_method(self, args, kwargs):
+        return self.interpreter.backend.get_target_filename_abs(self.held_object)
+
+    @noPosargs
+    @permittedKwargs({})
+    def outdir_method(self, args, kwargs):
+        return self.interpreter.backend.get_target_dir(self.held_object)
+
+    @permittedKwargs({})
+    def extract_objects_method(self, args, kwargs):
+        gobjs = self.held_object.extract_objects(args)
+        return GeneratedObjectsHolder(gobjs)
+
+    @FeatureNewKwargs('extract_all_objects', '0.46.0', ['recursive'])
+    @noPosargs
+    @permittedKwargs({'recursive'})
+    def extract_all_objects_method(self, args, kwargs):
+        recursive = kwargs.get('recursive', False)
+        gobjs = self.held_object.extract_all_objects(recursive)
+        if gobjs.objlist and 'recursive' not in kwargs:
+            mlog.warning('extract_all_objects called without setting recursive '
+                         'keyword argument. Meson currently defaults to '
+                         'non-recursive to maintain backward compatibility but '
+                         'the default will be changed in the future.',
+                         location=self.current_node)
+        return GeneratedObjectsHolder(gobjs)
+
+    @noPosargs
+    @permittedKwargs({})
+    def get_id_method(self, args, kwargs):
+        return self.held_object.get_id()
+
+    @FeatureNew('name', '0.54.0')
+    @noPosargs
+    @permittedKwargs({})
+    def name_method(self, args, kwargs):
+        return self.held_object.name
+
+class ExecutableHolder(BuildTargetHolder[build.Executable]):
+    pass
+
+class StaticLibraryHolder(BuildTargetHolder[build.StaticLibrary]):
+    pass
+
+class SharedLibraryHolder(BuildTargetHolder[build.SharedLibrary]):
+    def __init__(self, target: build.SharedLibrary, interp: 'Interpreter'):
+        super().__init__(target, interp)
+        # Set to True only when called from self.func_shared_lib().
+        target.shared_library_only = False
+
+class BothLibrariesHolder(BuildTargetHolder):
+    def __init__(self, shared_holder, static_holder, interp):
+        # FIXME: This build target always represents the shared library, but
+        # that should be configurable.
+        super().__init__(shared_holder.held_object, interp)
+        self.shared_holder = shared_holder
+        self.static_holder = static_holder
+        self.methods.update({'get_shared_lib': self.get_shared_lib_method,
+                             'get_static_lib': self.get_static_lib_method,
+                             })
+
+    def __repr__(self):
+        r = '<{} {}: {}, {}: {}>'
+        h1 = self.shared_holder.held_object
+        h2 = self.static_holder.held_object
+        return r.format(self.__class__.__name__, h1.get_id(), h1.filename, h2.get_id(), h2.filename)
+
+    @noPosargs
+    @permittedKwargs({})
+    def get_shared_lib_method(self, args, kwargs):
+        return self.shared_holder
+
+    @noPosargs
+    @permittedKwargs({})
+    def get_static_lib_method(self, args, kwargs):
+        return self.static_holder
+
+class SharedModuleHolder(BuildTargetHolder[build.SharedModule]):
+    pass
+
+class JarHolder(BuildTargetHolder[build.Jar]):
+    pass
+
+class CustomTargetIndexHolder(TargetHolder[build.CustomTargetIndex]):
+    def __init__(self, target: build.CustomTargetIndex, interp: 'Interpreter'):
+        super().__init__(target, interp)
+        self.methods.update({'full_path': self.full_path_method,
+                             })
+
+    @FeatureNew('custom_target[i].full_path', '0.54.0')
+    @noPosargs
+    @permittedKwargs({})
+    def full_path_method(self, args, kwargs):
+        return self.interpreter.backend.get_target_filename_abs(self.held_object)
+
+class CustomTargetHolder(TargetHolder):
+    def __init__(self, target: 'build.CustomTarget', interp: 'Interpreter'):
+        super().__init__(target, interp)
+        self.methods.update({'full_path': self.full_path_method,
+                             'to_list': self.to_list_method,
+                             })
+
+    def __repr__(self):
+        r = '<{} {}: {}>'
+        h = self.held_object
+        return r.format(self.__class__.__name__, h.get_id(), h.command)
+
+    @noPosargs
+    @permittedKwargs({})
+    def full_path_method(self, args, kwargs):
+        return self.interpreter.backend.get_target_filename_abs(self.held_object)
+
+    @FeatureNew('custom_target.to_list', '0.54.0')
+    @noPosargs
+    @permittedKwargs({})
+    def to_list_method(self, args, kwargs):
+        result = []
+        for i in self.held_object:
+            result.append(CustomTargetIndexHolder(i, self.interpreter))
+        return result
+
+    def __getitem__(self, index):
+        return CustomTargetIndexHolder(self.held_object[index], self.interpreter)
+
+    def __setitem__(self, index, value):  # lgtm[py/unexpected-raise-in-special-method]
+        raise InterpreterException('Cannot set a member of a CustomTarget')
+
+    def __delitem__(self, index):  # lgtm[py/unexpected-raise-in-special-method]
+        raise InterpreterException('Cannot delete a member of a CustomTarget')
+
+    def outdir_include(self):
+        return IncludeDirsHolder(build.IncludeDirs('', [], False,
+                                                   [os.path.join('@BUILD_ROOT@', self.interpreter.backend.get_target_dir(self.held_object))]))
+
+class RunTargetHolder(TargetHolder):
+    def __init__(self, target, interp):
+        super().__init__(target, interp)
+
+    def __repr__(self):
+        r = '<{} {}: {}>'
+        h = self.held_object
+        return r.format(self.__class__.__name__, h.get_id(), h.command)
diff --git a/mesonbuild/interpreter/mesonmain.py b/mesonbuild/interpreter/mesonmain.py
new file mode 100644
index 0000000..eef1ccf
--- /dev/null
+++ b/mesonbuild/interpreter/mesonmain.py
@@ -0,0 +1,369 @@
+import os
+
+from .. import mesonlib
+from .. import dependencies
+from .. import build
+from .. import mlog
+
+from ..mesonlib import unholder, MachineChoice, OptionKey
+from ..programs import OverrideProgram, ExternalProgram
+from ..interpreterbase import (InterpreterObject, FeatureNewKwargs, FeatureNew, FeatureDeprecated,
+                               typed_pos_args, permittedKwargs, noArgsFlattening, noPosargs, noKwargs,
+                               MesonVersionString, InterpreterException)
+
+from .compiler import CompilerHolder
+from .interpreterobjects import (ExecutableHolder, ExternalProgramHolder,
+                                 CustomTargetHolder, CustomTargetIndexHolder,
+                                 EnvironmentVariablesHolder)
+
+import typing as T
+
+class MesonMain(InterpreterObject):
+    def __init__(self, build: 'build.Build', interpreter: 'Interpreter'):
+        InterpreterObject.__init__(self)
+        self.build = build
+        self.interpreter = interpreter
+        self.methods.update({'get_compiler': self.get_compiler_method,
+                             'is_cross_build': self.is_cross_build_method,
+                             'has_exe_wrapper': self.has_exe_wrapper_method,
+                             'can_run_host_binaries': self.can_run_host_binaries_method,
+                             'is_unity': self.is_unity_method,
+                             'is_subproject': self.is_subproject_method,
+                             'current_source_dir': self.current_source_dir_method,
+                             'current_build_dir': self.current_build_dir_method,
+                             'source_root': self.source_root_method,
+                             'build_root': self.build_root_method,
+                             'project_source_root': self.project_source_root_method,
+                             'project_build_root': self.project_build_root_method,
+                             'add_install_script': self.add_install_script_method,
+                             'add_postconf_script': self.add_postconf_script_method,
+                             'add_dist_script': self.add_dist_script_method,
+                             'install_dependency_manifest': self.install_dependency_manifest_method,
+                             'override_dependency': self.override_dependency_method,
+                             'override_find_program': self.override_find_program_method,
+                             'project_version': self.project_version_method,
+                             'project_license': self.project_license_method,
+                             'version': self.version_method,
+                             'project_name': self.project_name_method,
+                             'get_cross_property': self.get_cross_property_method,
+                             'get_external_property': self.get_external_property_method,
+                             'has_external_property': self.has_external_property_method,
+                             'backend': self.backend_method,
+                             'add_devenv': self.add_devenv_method,
+                             })
+
+    def _find_source_script(self, prog: T.Union[str, mesonlib.File, ExecutableHolder], args):
+        
+        if isinstance(prog, (ExecutableHolder, ExternalProgramHolder)):
+            return self.interpreter.backend.get_executable_serialisation([unholder(prog)] + args)
+        found = self.interpreter.func_find_program({}, prog, {}).held_object
+        es = self.interpreter.backend.get_executable_serialisation([found] + args)
+        es.subproject = self.interpreter.subproject
+        return es
+
+    def _process_script_args(
+            self, name: str, args: T.List[T.Union[
+                str, mesonlib.File, CustomTargetHolder,
+                CustomTargetIndexHolder,
+                ExternalProgramHolder, ExecutableHolder,
+            ]], allow_built: bool = False) -> T.List[str]:
+        script_args = []  # T.List[str]
+        new = False
+        for a in args:
+            a = unholder(a)
+            if isinstance(a, str):
+                script_args.append(a)
+            elif isinstance(a, mesonlib.File):
+                new = True
+                script_args.append(a.rel_to_builddir(self.interpreter.environment.source_dir))
+            elif isinstance(a, (build.BuildTarget, build.CustomTarget, build.CustomTargetIndex)):
+                if not allow_built:
+                    raise InterpreterException(f'Arguments to {name} cannot be built')
+                new = True
+                script_args.extend([os.path.join(a.get_subdir(), o) for o in a.get_outputs()])
+
+                # This feels really hacky, but I'm not sure how else to fix
+                # this without completely rewriting install script handling.
+                # This is complicated by the fact that the install target
+                # depends on all.
+                if isinstance(a, build.CustomTargetIndex):
+                    a.target.build_by_default = True
+                else:
+                    a.build_by_default = True
+            elif isinstance(a, ExternalProgram):
+                script_args.extend(a.command)
+                new = True
+            else:
+                raise InterpreterException(
+                    'Arguments to {} must be strings, Files, or CustomTargets, '
+                    'Indexes of CustomTargets'.format(name))
+        if new:
+            FeatureNew.single_use(
+                'Calling "{}" with File, CustomTaget, Index of CustomTarget, '
+                'Executable, or ExternalProgram'.format(name),
+                '0.55.0', self.interpreter.subproject)
+        return script_args
+
+    @FeatureNewKwargs('add_install_script', '0.57.0', ['skip_if_destdir'])
+    @permittedKwargs({'skip_if_destdir'})
+    def add_install_script_method(self, args: 'T.Tuple[T.Union[str, mesonlib.File, ExecutableHolder], T.Union[str, mesonlib.File, CustomTargetHolder, CustomTargetIndexHolder], ...]', kwargs):
+        if len(args) < 1:
+            raise InterpreterException('add_install_script takes one or more arguments')
+        if isinstance(args[0], mesonlib.File):
+            FeatureNew.single_use('Passing file object to script parameter of add_install_script',
+                                  '0.57.0', self.interpreter.subproject)
+        skip_if_destdir = kwargs.get('skip_if_destdir', False)
+        if not isinstance(skip_if_destdir, bool):
+            raise InterpreterException('skip_if_destdir keyword argument must be boolean')
+        script_args = self._process_script_args('add_install_script', args[1:], allow_built=True)
+        script = self._find_source_script(args[0], script_args)
+        script.skip_if_destdir = skip_if_destdir
+        self.build.install_scripts.append(script)
+
+    @permittedKwargs(set())
+    def add_postconf_script_method(self, args, kwargs):
+        if len(args) < 1:
+            raise InterpreterException('add_postconf_script takes one or more arguments')
+        if isinstance(args[0], mesonlib.File):
+            FeatureNew.single_use('Passing file object to script parameter of add_postconf_script',
+                                  '0.57.0', self.interpreter.subproject)
+        script_args = self._process_script_args('add_postconf_script', args[1:], allow_built=True)
+        script = self._find_source_script(args[0], script_args)
+        self.build.postconf_scripts.append(script)
+
+    @permittedKwargs(set())
+    def add_dist_script_method(self, args, kwargs):
+        if len(args) < 1:
+            raise InterpreterException('add_dist_script takes one or more arguments')
+        if len(args) > 1:
+            FeatureNew.single_use('Calling "add_dist_script" with multiple arguments',
+                                  '0.49.0', self.interpreter.subproject)
+        if isinstance(args[0], mesonlib.File):
+            FeatureNew.single_use('Passing file object to script parameter of add_dist_script',
+                                  '0.57.0', self.interpreter.subproject)
+        if self.interpreter.subproject != '':
+            FeatureNew.single_use('Calling "add_dist_script" in a subproject',
+                                  '0.58.0', self.interpreter.subproject)
+        script_args = self._process_script_args('add_dist_script', args[1:], allow_built=True)
+        script = self._find_source_script(args[0], script_args)
+        self.build.dist_scripts.append(script)
+
+    @noPosargs
+    @permittedKwargs({})
+    def current_source_dir_method(self, args, kwargs):
+        src = self.interpreter.environment.source_dir
+        sub = self.interpreter.subdir
+        if sub == '':
+            return src
+        return os.path.join(src, sub)
+
+    @noPosargs
+    @permittedKwargs({})
+    def current_build_dir_method(self, args, kwargs):
+        src = self.interpreter.environment.build_dir
+        sub = self.interpreter.subdir
+        if sub == '':
+            return src
+        return os.path.join(src, sub)
+
+    @noPosargs
+    @permittedKwargs({})
+    def backend_method(self, args, kwargs):
+        return self.interpreter.backend.name
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureDeprecated('meson.source_root', '0.56.0', 'use meson.current_source_dir instead.')
+    def source_root_method(self, args, kwargs):
+        return self.interpreter.environment.source_dir
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureDeprecated('meson.build_root', '0.56.0', 'use meson.current_build_dir instead.')
+    def build_root_method(self, args, kwargs):
+        return self.interpreter.environment.build_dir
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureNew('meson.project_source_root', '0.56.0')
+    def project_source_root_method(self, args, kwargs):
+        src = self.interpreter.environment.source_dir
+        sub = self.interpreter.root_subdir
+        if sub == '':
+            return src
+        return os.path.join(src, sub)
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureNew('meson.project_build_root', '0.56.0')
+    def project_build_root_method(self, args, kwargs):
+        src = self.interpreter.environment.build_dir
+        sub = self.interpreter.root_subdir
+        if sub == '':
+            return src
+        return os.path.join(src, sub)
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureDeprecated('meson.has_exe_wrapper', '0.55.0', 'use meson.can_run_host_binaries instead.')
+    def has_exe_wrapper_method(self, args: T.Tuple[object, ...], kwargs: T.Dict[str, object]) -> bool:
+        return self.can_run_host_binaries_impl(args, kwargs)
+
+    @noPosargs
+    @permittedKwargs({})
+    @FeatureNew('meson.can_run_host_binaries', '0.55.0')
+    def can_run_host_binaries_method(self, args: T.Tuple[object, ...], kwargs: T.Dict[str, object]) -> bool:
+        return self.can_run_host_binaries_impl(args, kwargs)
+
+    def can_run_host_binaries_impl(self, args, kwargs):
+        if (self.is_cross_build_method(None, None) and
+                self.build.environment.need_exe_wrapper()):
+            if self.build.environment.exe_wrapper is None:
+                return False
+        # We return True when exe_wrap is defined, when it's not needed, and
+        # when we're compiling natively. The last two are semantically confusing.
+        # Need to revisit this.
+        return True
+
+    @noPosargs
+    @permittedKwargs({})
+    def is_cross_build_method(self, args, kwargs):
+        return self.build.environment.is_cross_build()
+
+    @permittedKwargs({'native'})
+    def get_compiler_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('get_compiler_method must have one and only one argument.')
+        cname = args[0]
+        for_machine = self.interpreter.machine_from_native_kwarg(kwargs)
+        clist = self.interpreter.coredata.compilers[for_machine]
+        if cname in clist:
+            return CompilerHolder(clist[cname], self.build.environment, self.interpreter.subproject)
+        raise InterpreterException(f'Tried to access compiler for language "{cname}", not specified for {for_machine.get_lower_case_name()} machine.')
+
+    @noPosargs
+    @permittedKwargs({})
+    def is_unity_method(self, args, kwargs):
+        optval = self.interpreter.environment.coredata.get_option(OptionKey('unity'))
+        if optval == 'on' or (optval == 'subprojects' and self.interpreter.is_subproject()):
+            return True
+        return False
+
+    @noPosargs
+    @permittedKwargs({})
+    def is_subproject_method(self, args, kwargs):
+        return self.interpreter.is_subproject()
+
+    @permittedKwargs({})
+    def install_dependency_manifest_method(self, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Must specify manifest install file name')
+        if not isinstance(args[0], str):
+            raise InterpreterException('Argument must be a string.')
+        self.build.dep_manifest_name = args[0]
+
+    @FeatureNew('meson.override_find_program', '0.46.0')
+    @permittedKwargs({})
+    def override_find_program_method(self, args, kwargs):
+        if len(args) != 2:
+            raise InterpreterException('Override needs two arguments')
+        name, exe = args
+        if not isinstance(name, str):
+            raise InterpreterException('First argument must be a string')
+        exe = unholder(exe)
+        if isinstance(exe, mesonlib.File):
+            abspath = exe.absolute_path(self.interpreter.environment.source_dir,
+                                        self.interpreter.environment.build_dir)
+            if not os.path.exists(abspath):
+                raise InterpreterException('Tried to override %s with a file that does not exist.' % name)
+            exe = OverrideProgram(name, abspath)
+        if not isinstance(exe, (ExternalProgram, build.Executable)):
+            raise InterpreterException('Second argument must be an external program or executable.')
+        self.interpreter.add_find_program_override(name, exe)
+
+    @FeatureNew('meson.override_dependency', '0.54.0')
+    @permittedKwargs({'native'})
+    def override_dependency_method(self, args, kwargs):
+        if len(args) != 2:
+            raise InterpreterException('Override needs two arguments')
+        name = args[0]
+        dep = args[1]
+        if not isinstance(name, str) or not name:
+            raise InterpreterException('First argument must be a string and cannot be empty')
+        dep = unholder(dep)
+        if not isinstance(dep, dependencies.Dependency):
+            raise InterpreterException('Second argument must be a dependency object')
+        identifier = dependencies.get_dep_identifier(name, kwargs)
+        for_machine = self.interpreter.machine_from_native_kwarg(kwargs)
+        override = self.build.dependency_overrides[for_machine].get(identifier)
+        if override:
+            m = 'Tried to override dependency {!r} which has already been resolved or overridden at {}'
+            location = mlog.get_error_location_string(override.node.filename, override.node.lineno)
+            raise InterpreterException(m.format(name, location))
+        self.build.dependency_overrides[for_machine][identifier] = \
+            build.DependencyOverride(dep, self.interpreter.current_node)
+
+    @noPosargs
+    @permittedKwargs({})
+    def project_version_method(self, args, kwargs):
+        return self.build.dep_manifest[self.interpreter.active_projectname]['version']
+
+    @FeatureNew('meson.project_license()', '0.45.0')
+    @noPosargs
+    @permittedKwargs({})
+    def project_license_method(self, args, kwargs):
+        return self.build.dep_manifest[self.interpreter.active_projectname]['license']
+
+    @noPosargs
+    @permittedKwargs({})
+    def version_method(self, args, kwargs):
+        return MesonVersionString(self.interpreter.coredata.version)
+
+    @noPosargs
+    @permittedKwargs({})
+    def project_name_method(self, args, kwargs):
+        return self.interpreter.active_projectname
+
+    def __get_external_property_impl(self, propname: str, fallback: T.Optional[object], machine: MachineChoice) -> object:
+        """Shared implementation for get_cross_property and get_external_property."""
+        try:
+            return self.interpreter.environment.properties[machine][propname]
+        except KeyError:
+            if fallback is not None:
+                return fallback
+            raise InterpreterException(f'Unknown property for {machine.get_lower_case_name()} machine: {propname}')
+
+    @noArgsFlattening
+    @permittedKwargs({})
+    @FeatureDeprecated('meson.get_cross_property', '0.58.0', 'Use meson.get_external_property() instead')
+    @typed_pos_args('meson.get_cross_property', str, optargs=[object])
+    def get_cross_property_method(self, args: T.Tuple[str, T.Optional[object]], kwargs: T.Dict[str, T.Any]) -> object:
+        propname, fallback = args
+        return self.__get_external_property_impl(propname, fallback, MachineChoice.HOST)
+
+    @noArgsFlattening
+    @permittedKwargs({'native'})
+    @FeatureNew('meson.get_external_property', '0.54.0')
+    @typed_pos_args('meson.get_external_property', str, optargs=[object])
+    def get_external_property_method(self, args: T.Tuple[str, T.Optional[object]], kwargs: T.Dict[str, T.Any]) -> object:
+        propname, fallback = args
+        machine = self.interpreter.machine_from_native_kwarg(kwargs)
+        return self.__get_external_property_impl(propname, fallback, machine)
+
+
+    @permittedKwargs({'native'})
+    @FeatureNew('meson.has_external_property', '0.58.0')
+    @typed_pos_args('meson.has_external_property', str)
+    def has_external_property_method(self, args: T.Tuple[str], kwargs: T.Dict[str, T.Any]) -> str:
+        prop_name = args[0]
+        for_machine = self.interpreter.machine_from_native_kwarg(kwargs)
+        return prop_name in self.interpreter.environment.properties[for_machine]
+
+    @FeatureNew('add_devenv', '0.58.0')
+    @noKwargs
+    @typed_pos_args('add_devenv', (str, list, dict, EnvironmentVariablesHolder))
+    def add_devenv_method(self, args: T.Union[str, list, dict, EnvironmentVariablesHolder], kwargs: T.Dict[str, T.Any]) -> None:
+        env = args[0]
+        if isinstance(env, (str, list, dict)):
+            env = EnvironmentVariablesHolder(env)
+        self.build.devenv.append(env.held_object)
diff --git a/mesonbuild/modules/cmake.py b/mesonbuild/modules/cmake.py
index 84fe658..ee09359 100644
--- a/mesonbuild/modules/cmake.py
+++ b/mesonbuild/modules/cmake.py
@@ -20,8 +20,9 @@ from . import ExtensionModule, ModuleReturnValue
 
 from .. import build, mesonlib, mlog
 from ..cmake import SingleTargetOptions, TargetOptions, cmake_defines_to_args
-from ..interpreter import ConfigurationDataHolder, InterpreterException, SubprojectHolder, DependencyHolder
+from ..interpreter import ConfigurationDataHolder, SubprojectHolder, DependencyHolder
 from ..interpreterbase import (
+    InterpreterException,
     InterpreterObject,
     ObjectHolder,
 
diff --git a/mesonbuild/modules/keyval.py b/mesonbuild/modules/keyval.py
index 8123a57..5fc4d52 100644
--- a/mesonbuild/modules/keyval.py
+++ b/mesonbuild/modules/keyval.py
@@ -16,8 +16,7 @@ from . import ExtensionModule
 
 from .. import mesonlib
 from ..mesonlib import typeslistify
-from ..interpreterbase import FeatureNew, noKwargs
-from ..interpreter import InvalidCode
+from ..interpreterbase import FeatureNew, noKwargs, InvalidCode
 
 import os
 
diff --git a/mesonbuild/modules/unstable_rust.py b/mesonbuild/modules/unstable_rust.py
index 91f7146..36d3164 100644
--- a/mesonbuild/modules/unstable_rust.py
+++ b/mesonbuild/modules/unstable_rust.py
@@ -19,8 +19,8 @@ from . import ExtensionModule, ModuleReturnValue
 from .. import mlog
 from ..build import BuildTarget, CustomTargetIndex, Executable, GeneratedList, InvalidArguments, IncludeDirs, CustomTarget
 from ..dependencies import Dependency, ExternalLibrary
-from ..interpreter import ExecutableHolder, BuildTargetHolder, CustomTargetHolder, permitted_kwargs, noPosargs
-from ..interpreterbase import InterpreterException, permittedKwargs, FeatureNew, typed_pos_args
+from ..interpreter import ExecutableHolder, BuildTargetHolder, CustomTargetHolder, permitted_kwargs
+from ..interpreterbase import InterpreterException, permittedKwargs, FeatureNew, typed_pos_args, noPosargs
 from ..mesonlib import stringlistify, unholder, listify, typeslistify, File
 
 if T.TYPE_CHECKING:
diff --git a/run_unittests.py b/run_unittests.py
index 1eba4df..33e2eec 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -50,8 +50,8 @@ import mesonbuild.environment
 import mesonbuild.mesonlib
 import mesonbuild.coredata
 import mesonbuild.modules.gnome
-from mesonbuild.interpreter import Interpreter, ObjectHolder
-from mesonbuild.interpreterbase import typed_pos_args, InvalidArguments
+from mesonbuild.interpreter import Interpreter
+from mesonbuild.interpreterbase import typed_pos_args, InvalidArguments, ObjectHolder
 from mesonbuild.ast import AstInterpreter
 from mesonbuild.mesonlib import (
     BuildDirLock, LibType, MachineChoice, PerMachine, Version, is_windows,