kopia lustrzana https://github.com/espressif/esp-idf
608 wiersze
23 KiB
Python
608 wiersze
23 KiB
Python
#
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# SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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#
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import abc
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import os
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import re
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from collections import namedtuple
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from enum import Enum
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from entity import Entity
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from pyparsing import (Combine, Forward, Group, Keyword, Literal, OneOrMore, Optional, Or, ParseFatalException,
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Suppress, Word, ZeroOrMore, alphanums, alphas, delimitedList, indentedBlock, nums,
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originalTextFor, restOfLine)
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from sdkconfig import SDKConfig
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class FragmentFile():
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"""
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Processes a fragment file and stores all parsed fragments. For
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more information on how this class interacts with classes for the different fragment types,
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see description of Fragment.
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"""
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def __init__(self, fragment_file, sdkconfig):
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try:
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fragment_file = open(fragment_file, 'r')
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except TypeError:
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pass
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path = os.path.realpath(fragment_file.name)
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indent_stack = [1]
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class parse_ctx:
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fragment = None # current fragment
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key = '' # current key
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keys = list() # list of keys parsed
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key_grammar = None # current key grammar
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@staticmethod
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def reset():
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parse_ctx.fragment_instance = None
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parse_ctx.key = ''
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parse_ctx.keys = list()
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parse_ctx.key_grammar = None
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def fragment_type_parse_action(toks):
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parse_ctx.reset()
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parse_ctx.fragment = FRAGMENT_TYPES[toks[0]]() # create instance of the fragment
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return None
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def expand_conditionals(toks, stmts):
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try:
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stmt = toks['value']
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stmts.append(stmt)
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except KeyError:
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try:
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conditions = toks['conditional']
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for condition in conditions:
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try:
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_toks = condition[1]
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_cond = condition[0]
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if sdkconfig.evaluate_expression(_cond):
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expand_conditionals(_toks, stmts)
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break
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except IndexError:
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expand_conditionals(condition[0], stmts)
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except KeyError:
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for tok in toks:
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expand_conditionals(tok, stmts)
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def key_body_parsed(pstr, loc, toks):
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stmts = list()
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expand_conditionals(toks, stmts)
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if parse_ctx.key_grammar.min and len(stmts) < parse_ctx.key_grammar.min:
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raise ParseFatalException(pstr, loc, "fragment requires at least %d values for key '%s'" %
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(parse_ctx.key_grammar.min, parse_ctx.key))
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if parse_ctx.key_grammar.max and len(stmts) > parse_ctx.key_grammar.max:
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raise ParseFatalException(pstr, loc, "fragment requires at most %d values for key '%s'" %
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(parse_ctx.key_grammar.max, parse_ctx.key))
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try:
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parse_ctx.fragment.set_key_value(parse_ctx.key, stmts)
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except Exception as e:
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raise ParseFatalException(pstr, loc, "unable to add key '%s'; %s" % (parse_ctx.key, str(e)))
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return None
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key = Word(alphanums + '_') + Suppress(':')
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key_stmt = Forward()
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condition_block = indentedBlock(key_stmt, indent_stack)
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key_stmts = OneOrMore(condition_block)
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key_body = Suppress(key) + key_stmts
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key_body.setParseAction(key_body_parsed)
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condition = originalTextFor(SDKConfig.get_expression_grammar()).setResultsName('condition')
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if_condition = Group(Suppress('if') + condition + Suppress(':') + condition_block)
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elif_condition = Group(Suppress('elif') + condition + Suppress(':') + condition_block)
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else_condition = Group(Suppress('else') + Suppress(':') + condition_block)
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conditional = (if_condition + Optional(OneOrMore(elif_condition)) + Optional(else_condition)).setResultsName('conditional')
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def key_parse_action(pstr, loc, toks):
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key = toks[0]
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if key in parse_ctx.keys:
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raise ParseFatalException(pstr, loc, "duplicate key '%s' value definition" % parse_ctx.key)
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parse_ctx.key = key
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parse_ctx.keys.append(key)
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try:
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parse_ctx.key_grammar = parse_ctx.fragment.get_key_grammars()[key]
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key_grammar = parse_ctx.key_grammar.grammar
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except KeyError:
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raise ParseFatalException(pstr, loc, "key '%s' is not supported by fragment" % key)
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except Exception as e:
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raise ParseFatalException(pstr, loc, "unable to parse key '%s'; %s" % (key, str(e)))
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key_stmt << (conditional | Group(key_grammar).setResultsName('value'))
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return None
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def name_parse_action(pstr, loc, toks):
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parse_ctx.fragment.name = toks[0]
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key.setParseAction(key_parse_action)
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ftype = Word(alphas).setParseAction(fragment_type_parse_action)
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fid = Suppress(':') + Word(alphanums + '_.').setResultsName('name')
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fid.setParseAction(name_parse_action)
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header = Suppress('[') + ftype + fid + Suppress(']')
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def fragment_parse_action(pstr, loc, toks):
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key_grammars = parse_ctx.fragment.get_key_grammars()
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required_keys = set([k for (k,v) in key_grammars.items() if v.required])
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present_keys = required_keys.intersection(set(parse_ctx.keys))
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if present_keys != required_keys:
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raise ParseFatalException(pstr, loc, 'required keys %s for fragment not found' %
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list(required_keys - present_keys))
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return parse_ctx.fragment
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fragment_stmt = Forward()
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fragment_block = indentedBlock(fragment_stmt, indent_stack)
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fragment_if_condition = Group(Suppress('if') + condition + Suppress(':') + fragment_block)
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fragment_elif_condition = Group(Suppress('elif') + condition + Suppress(':') + fragment_block)
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fragment_else_condition = Group(Suppress('else') + Suppress(':') + fragment_block)
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fragment_conditional = (fragment_if_condition + Optional(OneOrMore(fragment_elif_condition)) +
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Optional(fragment_else_condition)).setResultsName('conditional')
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fragment = (header + OneOrMore(indentedBlock(key_body, indent_stack, False))).setResultsName('value')
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fragment.setParseAction(fragment_parse_action)
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fragment.ignore('#' + restOfLine)
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deprecated_mapping = DeprecatedMapping.get_fragment_grammar(sdkconfig, fragment_file.name).setResultsName('value')
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fragment_stmt << (Group(deprecated_mapping) | Group(fragment) | Group(fragment_conditional))
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def fragment_stmt_parsed(pstr, loc, toks):
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stmts = list()
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expand_conditionals(toks, stmts)
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return stmts
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parser = ZeroOrMore(fragment_stmt)
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parser.setParseAction(fragment_stmt_parsed)
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self.fragments = parser.parseFile(fragment_file, parseAll=True)
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for fragment in self.fragments:
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fragment.path = path
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class Fragment():
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"""
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Base class for a fragment that can be parsed from a fragment file. All fragments
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share the common grammar:
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[type:name]
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key1:value1
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key2:value2
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...
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Supporting a new fragment type means deriving a concrete class which specifies
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key-value pairs that the fragment supports and what to do with the parsed key-value pairs.
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The new fragment must also be appended to FRAGMENT_TYPES, specifying the
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keyword for the type and the derived class.
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The key of the key-value pair is a simple keyword string. Other parameters
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that describe the key-value pair is specified in Fragment.KeyValue:
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1. grammar - pyparsing grammar to parse the value of key-value pair
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2. min - the minimum number of value in the key entry, None means no minimum
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3. max - the maximum number of value in the key entry, None means no maximum
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4. required - if the key-value pair is required in the fragment
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Setting min=max=1 means that the key has a single value.
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FragmentFile provides conditional expression evaluation, enforcing
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the parameters for Fragment.Keyvalue.
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"""
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__metaclass__ = abc.ABCMeta
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KeyValue = namedtuple('KeyValue', 'grammar min max required')
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IDENTIFIER = Word(alphas + '_', alphanums + '_')
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ENTITY = Word(alphanums + '.-_$+')
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@abc.abstractmethod
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def set_key_value(self, key, parse_results):
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pass
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@abc.abstractmethod
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def get_key_grammars(self):
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pass
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class Sections(Fragment):
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"""
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Fragment which contains list of input sections.
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[sections:<name>]
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entries:
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.section1
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.section2
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...
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"""
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# Unless quoted, symbol names start with a letter, underscore, or point
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# and may include any letters, underscores, digits, points, and hyphens.
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GNU_LD_SYMBOLS = Word(alphas + '_.', alphanums + '._-')
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entries_grammar = Combine(GNU_LD_SYMBOLS + Optional('+'))
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grammars = {
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'entries': Fragment.KeyValue(entries_grammar.setResultsName('section'), 1, None, True)
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}
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"""
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Utility function that returns a list of sections given a sections fragment entry,
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with the '+' notation and symbol concatenation handled automatically.
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"""
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@staticmethod
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def get_section_data_from_entry(sections_entry, symbol=None):
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if not symbol:
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sections = list()
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sections.append(sections_entry.replace('+', ''))
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sections.append(sections_entry.replace('+', '.*'))
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return sections
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else:
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if sections_entry.endswith('+'):
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section = sections_entry.replace('+', '.*')
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expansion = section.replace('.*', '.' + symbol)
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return (section, expansion)
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else:
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return (sections_entry, None)
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def set_key_value(self, key, parse_results):
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if key == 'entries':
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self.entries = set()
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for result in parse_results:
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self.entries.add(result['section'])
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def get_key_grammars(self):
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return self.__class__.grammars
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class Scheme(Fragment):
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"""
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Fragment which defines where the input sections defined in a Sections fragment
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is going to end up, the target. The targets are markers in a linker script template
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(see LinkerScript in linker_script.py).
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[scheme:<name>]
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entries:
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sections1 -> target1
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...
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"""
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grammars = {
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'entries': Fragment.KeyValue(Fragment.IDENTIFIER.setResultsName('sections') + Suppress('->') +
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Fragment.IDENTIFIER.setResultsName('target'), 1, None, True)
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}
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def set_key_value(self, key, parse_results):
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if key == 'entries':
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self.entries = set()
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for result in parse_results:
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self.entries.add((result['sections'], result['target']))
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def get_key_grammars(self):
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return self.__class__.grammars
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class Mapping(Fragment):
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"""
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Fragment which attaches a scheme to entities (see Entity in entity.py), specifying where the input
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sections of the entity will end up.
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[mapping:<name>]
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archive: lib1.a
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entries:
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obj1:symbol1 (scheme1); section1 -> target1 KEEP SURROUND(sym1) ...
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obj2 (scheme2)
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...
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Ultimately, an `entity (scheme)` entry generates an
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input section description (see https://sourceware.org/binutils/docs/ld/Input-Section.html)
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in the output linker script. It is possible to attach 'flags' to the
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`entity (scheme)` to generate different output commands or to
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emit additional keywords in the generated input section description. The
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input section description, as well as other output commands, is defined in
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output_commands.py.
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"""
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class Flag():
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PRE_POST = (Optional(Suppress(',') + Suppress('pre').setParseAction(lambda: True).setResultsName('pre')) +
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Optional(Suppress(',') + Suppress('post').setParseAction(lambda: True).setResultsName('post')))
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class Surround(Flag):
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def __init__(self, symbol):
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self.symbol = symbol
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self.pre = True
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self.post = True
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@staticmethod
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def get_grammar():
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# SURROUND(symbol)
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#
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# '__symbol_start', '__symbol_end' is generated before and after
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# the corresponding input section description, respectively.
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grammar = (Keyword('SURROUND').suppress() +
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Suppress('(') +
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Fragment.IDENTIFIER.setResultsName('symbol') +
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Suppress(')'))
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grammar.setParseAction(lambda tok: Mapping.Surround(tok.symbol))
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return grammar
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def __eq__(self, other):
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return (isinstance(other, Mapping.Surround) and
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self.symbol == other.symbol)
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class Align(Flag):
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def __init__(self, alignment, pre=True, post=False):
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self.alignment = alignment
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self.pre = pre
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self.post = post
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@staticmethod
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def get_grammar():
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# ALIGN(alignment, [, pre, post]).
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#
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# Generates alignment command before and/or after the corresponding
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# input section description, depending whether pre, post or
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# both are specified.
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grammar = (Keyword('ALIGN').suppress() +
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Suppress('(') +
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Word(nums).setResultsName('alignment') +
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Mapping.Flag.PRE_POST +
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Suppress(')'))
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def on_parse(tok):
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alignment = int(tok.alignment)
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if tok.pre == '' and tok.post == '':
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res = Mapping.Align(alignment)
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elif tok.pre != '' and tok.post == '':
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res = Mapping.Align(alignment, tok.pre)
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elif tok.pre == '' and tok.post != '':
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res = Mapping.Align(alignment, False, tok.post)
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else:
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res = Mapping.Align(alignment, tok.pre, tok.post)
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return res
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grammar.setParseAction(on_parse)
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return grammar
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def __eq__(self, other):
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return (isinstance(other, Mapping.Align) and
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self.alignment == other.alignment and
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self.pre == other.pre and
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self.post == other.post)
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class Keep(Flag):
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def __init__(self):
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pass
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@staticmethod
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def get_grammar():
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# KEEP()
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#
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# Surrounds input section description with KEEP command.
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grammar = Keyword('KEEP()').setParseAction(Mapping.Keep)
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return grammar
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def __eq__(self, other):
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return isinstance(other, Mapping.Keep)
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class Sort(Flag):
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class Type(Enum):
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NAME = 0
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ALIGNMENT = 1
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INIT_PRIORITY = 2
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def __init__(self, first, second=None):
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self.first = first
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self.second = second
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@staticmethod
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def get_grammar():
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# SORT([sort_by_first, sort_by_second])
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#
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# where sort_by_first, sort_by_second = {name, alignment, init_priority}
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#
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# Emits SORT_BY_NAME, SORT_BY_ALIGNMENT or SORT_BY_INIT_PRIORITY
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# depending on arguments. Nested sort follows linker script rules.
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keywords = Keyword('name') | Keyword('alignment') | Keyword('init_priority')
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grammar = (Keyword('SORT').suppress() + Suppress('(') +
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keywords.setResultsName('first') +
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Optional(Suppress(',') + keywords.setResultsName('second')) + Suppress(')'))
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grammar.setParseAction(lambda tok: Mapping.Sort(tok.first, tok.second if tok.second != '' else None))
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return grammar
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def __eq__(self, other):
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return (isinstance(other, Mapping.Sort) and
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self.first == other.first and
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self.second == other.second)
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def __init__(self):
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Fragment.__init__(self)
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self.entries = set()
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# k = (obj, symbol, scheme)
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# v = list((section, target), Mapping.Flag))
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self.flags = dict()
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self.deprecated = False
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def set_key_value(self, key, parse_results):
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if key == 'archive':
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self.archive = parse_results[0]['archive']
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elif key == 'entries':
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for result in parse_results:
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obj = None
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symbol = None
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scheme = None
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obj = result['object']
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try:
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symbol = result['symbol']
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except KeyError:
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pass
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scheme = result['scheme']
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mapping = (obj, symbol, scheme)
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self.entries.add(mapping)
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try:
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parsed_flags = result['sections_target_flags']
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except KeyError:
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parsed_flags = []
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if parsed_flags:
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entry_flags = []
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for pf in parsed_flags:
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entry_flags.append((pf.sections, pf.target, list(pf.flags)))
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try:
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existing_flags = self.flags[mapping]
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except KeyError:
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existing_flags = list()
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self.flags[mapping] = existing_flags
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existing_flags.extend(entry_flags)
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def get_key_grammars(self):
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# There are three possible patterns for mapping entries:
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# obj:symbol (scheme)
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# obj (scheme)
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# * (scheme)
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# Flags can be specified for section->target in the scheme specified, ex:
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# obj (scheme); section->target SURROUND(symbol), section2->target2 ALIGN(4)
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obj = Fragment.ENTITY.setResultsName('object')
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symbol = Suppress(':') + Fragment.IDENTIFIER.setResultsName('symbol')
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scheme = Suppress('(') + Fragment.IDENTIFIER.setResultsName('scheme') + Suppress(')')
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# The flags are specified for section->target in the scheme specified
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sections_target = Scheme.grammars['entries'].grammar
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flag = Or([f.get_grammar() for f in [Mapping.Keep, Mapping.Align, Mapping.Surround, Mapping.Sort]])
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section_target_flags = Group(sections_target + Group(OneOrMore(flag)).setResultsName('flags'))
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pattern1 = obj + symbol
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pattern2 = obj
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pattern3 = Literal(Entity.ALL).setResultsName('object')
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entry = ((pattern1 | pattern2 | pattern3) + scheme +
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Optional(Suppress(';') + delimitedList(section_target_flags).setResultsName('sections_target_flags')))
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grammars = {
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'archive': Fragment.KeyValue(Or([Fragment.ENTITY, Word(Entity.ALL)]).setResultsName('archive'), 1, 1, True),
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'entries': Fragment.KeyValue(entry, 0, None, True)
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}
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return grammars
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class DeprecatedMapping():
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"""
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Mapping fragment with old grammar in versions older than ESP-IDF v4.0. Does not conform to
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requirements of the Fragment class and thus is limited when it comes to conditional expression
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evaluation.
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"""
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# Name of the default condition entry
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DEFAULT_CONDITION = 'default'
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@staticmethod
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def get_fragment_grammar(sdkconfig, fragment_file):
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# Match header [mapping]
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header = Suppress('[') + Suppress('mapping') + Suppress(']')
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# There are three possible patterns for mapping entries:
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# obj:symbol (scheme)
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# obj (scheme)
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# * (scheme)
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obj = Fragment.ENTITY.setResultsName('object')
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symbol = Suppress(':') + Fragment.IDENTIFIER.setResultsName('symbol')
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scheme = Suppress('(') + Fragment.IDENTIFIER.setResultsName('scheme') + Suppress(')')
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pattern1 = Group(obj + symbol + scheme)
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pattern2 = Group(obj + scheme)
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pattern3 = Group(Literal(Entity.ALL).setResultsName('object') + scheme)
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mapping_entry = pattern1 | pattern2 | pattern3
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# To simplify parsing, classify groups of condition-mapping entry into two types: normal and default
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# A normal grouping is one with a non-default condition. The default grouping is one which contains the
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# default condition
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mapping_entries = Group(ZeroOrMore(mapping_entry)).setResultsName('mappings')
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normal_condition = Suppress(':') + originalTextFor(SDKConfig.get_expression_grammar())
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default_condition = Optional(Suppress(':') + Literal(DeprecatedMapping.DEFAULT_CONDITION))
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normal_group = Group(normal_condition.setResultsName('condition') + mapping_entries)
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default_group = Group(default_condition + mapping_entries).setResultsName('default_group')
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normal_groups = Group(ZeroOrMore(normal_group)).setResultsName('normal_groups')
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# Any mapping fragment definition can have zero or more normal group and only one default group as a last entry.
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archive = Suppress('archive') + Suppress(':') + Fragment.ENTITY.setResultsName('archive')
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entries = Suppress('entries') + Suppress(':') + (normal_groups + default_group).setResultsName('entries')
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mapping = Group(header + archive + entries)
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mapping.ignore('#' + restOfLine)
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def parsed_deprecated_mapping(pstr, loc, toks):
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fragment = Mapping()
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fragment.archive = toks[0].archive
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fragment.name = re.sub(r'[^0-9a-zA-Z]+', '_', fragment.archive)
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fragment.deprecated = True
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fragment.entries = set()
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condition_true = False
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for entries in toks[0].entries[0]:
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condition = next(iter(entries.condition.asList())).strip()
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condition_val = sdkconfig.evaluate_expression(condition)
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if condition_val:
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for entry in entries[1]:
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fragment.entries.add((entry.object, None if entry.symbol == '' else entry.symbol, entry.scheme))
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condition_true = True
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break
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if not fragment.entries and not condition_true:
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try:
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entries = toks[0].entries[1][1]
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except IndexError:
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entries = toks[0].entries[1][0]
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for entry in entries:
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fragment.entries.add((entry.object, None if entry.symbol == '' else entry.symbol, entry.scheme))
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if not fragment.entries:
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fragment.entries.add(('*', None, 'default'))
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dep_warning = str(ParseFatalException(pstr, loc,
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'Warning: Deprecated old-style mapping fragment parsed in file %s.' % fragment_file))
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print(dep_warning)
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return fragment
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mapping.setParseAction(parsed_deprecated_mapping)
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return mapping
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FRAGMENT_TYPES = {
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'sections': Sections,
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'scheme': Scheme,
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'mapping': Mapping
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}
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