104 lines
2.3 KiB
Python
104 lines
2.3 KiB
Python
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# Copyright 2020-2021 Ternaris.
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# SPDX-License-Identifier: Apache-2.0
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"""Helpers used by code generators."""
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from __future__ import annotations
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from enum import IntEnum
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from importlib.util import module_from_spec, spec_from_loader
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from typing import TYPE_CHECKING, NamedTuple
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if TYPE_CHECKING:
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from types import ModuleType
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from typing import Any, Dict, List
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class Valtype(IntEnum):
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"""Msg field value types."""
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BASE = 1
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MESSAGE = 2
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ARRAY = 3
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SEQUENCE = 4
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class Descriptor(NamedTuple):
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"""Value type descriptor."""
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valtype: Valtype
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args: Any # Union[Descriptor, Msgdef, Tuple[int, Descriptor], str]
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SIZEMAP: Dict[str, int] = {
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'bool': 1,
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'int8': 1,
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'int16': 2,
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'int32': 4,
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'int64': 8,
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'uint8': 1,
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'uint16': 2,
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'uint32': 4,
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'uint64': 8,
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'float32': 4,
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'float64': 8,
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}
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def align(entry: Descriptor) -> int:
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"""Get alignment requirement for entry.
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Args:
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entry: Field.
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Returns:
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Required alignment in bytes.
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"""
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if entry.valtype == Valtype.BASE:
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if entry.args == 'string':
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return 4
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return SIZEMAP[entry.args]
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if entry.valtype == Valtype.MESSAGE:
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return align(entry.args.fields[0].descriptor)
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if entry.valtype == Valtype.ARRAY:
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return align(entry.args[1])
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assert entry.valtype == Valtype.SEQUENCE
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return 4
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def align_after(entry: Descriptor) -> int:
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"""Get alignment after entry.
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Args:
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entry: Field.
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Returns:
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Memory alignment after entry.
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"""
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if entry.valtype == Valtype.BASE:
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if entry.args == 'string':
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return 1
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return SIZEMAP[entry.args]
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if entry.valtype == Valtype.MESSAGE:
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return align_after(entry.args.fields[-1].descriptor)
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if entry.valtype == Valtype.ARRAY:
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return align_after(entry.args[1])
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assert entry.valtype == Valtype.SEQUENCE
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return min([4, align_after(entry.args)])
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def compile_lines(lines: List[str]) -> ModuleType:
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"""Compile lines of code to module.
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Args:
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lines: Lines of python code.
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Returns:
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Compiled and loaded module.
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"""
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module = module_from_spec(spec_from_loader('tmpmod', loader=None))
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exec('\n'.join(lines), module.__dict__) # pylint: disable=exec-used
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return module
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