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# Copyright (C) 2020 The Android Open Source Project
#
# 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.
"""Functions to build and parse directives from CFG files."""
import re
from typing import Iterable, List
from perf2cfg import exceptions
def build_flags(flags: Iterable[str]) -> str:
"""Builds a flags directive from a list of arguments.
Args:
flags (Iterable[str]): An iterable of flags.
Returns:
str: A flags directive with the given arguments.
Examples:
>>> parse_flags(['catch_block', 'critical'])
' flags "catch_block" "critical"'
"""
if not flags:
return ' flags'
args = ' '.join(f'"{flag}"' for flag in flags)
return f' flags {args}'
def build_name(name: str) -> str:
"""Builds a name directive from an argument.
Args:
name (str): An argument.
Returns:
str: A name directive with the given argument.
"""
return f' name "{name}"'
def parse_address(line: str) -> int:
"""Parses an address from a line.
Args:
line (str): A line to parse an address from.
Returns:
int: An instruction address.
Raises:
exceptions.ParseError: An error occurred during parsing.
Examples:
>>> parse_address('0x0000001c: d503201f nop')
28
"""
parts = line.split(':', 1)
addr = parts[0]
try:
return int(addr, 16)
except ValueError:
raise exceptions.ParseError('Expected an address')
def parse_flags(line: str) -> List[str]:
"""Parses a flags directive from a line.
Args:
line (str): A line to parse a flags directive from.
Returns:
List[str]: A list of unquoted arguments from a flags directive, or an
empty list if no arguments were found.
Raises:
exceptions.ParseError: An error occurred during parsing.
Example:
>>> parse_flags('flags "catch_block" "critical"')
['catch_block', 'critical']
"""
parts = line.split(None, 1)
if parts[0] != 'flags':
raise exceptions.ParseError('Expected a `flags` directive')
if len(parts) < 2:
return []
return re.findall(r'\"([^\"]+)\"', parts[1])
def parse_name(line: str) -> str:
"""Parses a name directive from a line.
Args:
line (str): A line to parse a name directive from.
Returns:
str: The unquoted argument of a name directive.
Raises:
exceptions.ParseError: An error occurred during parsing.
Examples:
>>> parse_name('name "disassembly (after)"')
'disassembly (after)'
"""
parts = line.split(None, 1)
if parts[0] != 'name':
raise exceptions.ParseError('Expected a `name` directive')
if len(parts) < 2:
raise exceptions.ParseError(
'Expected an argument to the `name` directive')
return parts[1].strip('"')
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