647 lines
26 KiB
Python
647 lines
26 KiB
Python
#
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# Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import collections
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import itertools
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import os
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import fnmatch
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from fragments import Sections, Scheme, Mapping, Fragment
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from pyparsing import Suppress, White, ParseException, Literal, Regex, Group, ZeroOrMore, Word, OneOrMore, nums, alphanums, alphas, Optional
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from common import LdGenFailure
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class PlacementRule():
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"""
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Encapsulates a generated placement rule placed under a target
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"""
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DEFAULT_SPECIFICITY = 0
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ARCHIVE_SPECIFICITY = 1
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OBJECT_SPECIFICITY = 2
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SYMBOL_SPECIFICITY = 3
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class __container():
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def __init__(self, content):
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self.content = content
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__metadata = collections.namedtuple("__metadata", "excludes expansions expanded")
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def __init__(self, archive, obj, symbol, sections, target):
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if archive == "*":
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archive = None
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if obj == "*":
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obj = None
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self.archive = archive
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self.obj = obj
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self.symbol = symbol
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self.target = target
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self.sections = dict()
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self.specificity = 0
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self.specificity += 1 if self.archive else 0
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self.specificity += 1 if (self.obj and not self.obj == '*') else 0
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self.specificity += 1 if self.symbol else 0
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for section in sections:
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section_data = Sections.get_section_data_from_entry(section, self.symbol)
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if not self.symbol:
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for s in section_data:
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metadata = self.__metadata(self.__container([]), self.__container([]), self.__container(False))
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self.sections[s] = metadata
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else:
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(section, expansion) = section_data
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if expansion:
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metadata = self.__metadata(self.__container([]), self.__container([expansion]), self.__container(True))
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self.sections[section] = metadata
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def get_section_names(self):
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return self.sections.keys()
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def add_exclusion(self, other, sections_infos=None):
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# Utility functions for this method
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def do_section_expansion(rule, section):
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if section in rule.get_section_names():
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sections_in_obj = sections_infos.get_obj_sections(rule.archive, rule.obj)
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expansions = fnmatch.filter(sections_in_obj, section)
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return expansions
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def remove_section_expansions(rule, section, expansions):
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existing_expansions = self.sections[section].expansions.content
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self.sections[section].expansions.content = [e for e in existing_expansions if e not in expansions]
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# Exit immediately if the exclusion to be added is more general than this rule.
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if not other.is_more_specific_rule_of(self):
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return
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for section in self.get_sections_intersection(other):
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if(other.specificity == PlacementRule.SYMBOL_SPECIFICITY):
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# If this sections has not been expanded previously, expand now and keep track.
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previously_expanded = self.sections[section].expanded.content
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if not previously_expanded:
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expansions = do_section_expansion(self, section)
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if expansions:
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self.sections[section].expansions.content = expansions
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self.sections[section].expanded.content = True
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previously_expanded = True
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# Remove the sections corresponding to the symbol name
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remove_section_expansions(self, section, other.sections[section].expansions.content)
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# If it has been expanded previously but now the expansions list is empty,
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# it means adding exclusions has exhausted the list. Remove the section entirely.
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if previously_expanded and not self.sections[section].expanded.content:
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del self.sections[section]
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else:
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# A rule section can have multiple rule sections excluded from it. Get the
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# most specific rule from the list, and if an even more specific rule is found,
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# replace it entirely. Otherwise, keep appending.
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exclusions = self.sections[section].excludes
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exclusions_list = exclusions.content if exclusions.content is not None else []
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exclusions_to_remove = filter(lambda r: r.is_more_specific_rule_of(other), exclusions_list)
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remaining_exclusions = [e for e in exclusions_list if e not in exclusions_to_remove]
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remaining_exclusions.append(other)
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self.sections[section].excludes.content = remaining_exclusions
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def get_sections_intersection(self, other):
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return set(self.sections.keys()).intersection(set(other.sections.keys()))
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def is_more_specific_rule_of(self, other):
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if (self.specificity <= other.specificity):
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return False
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# Compare archive, obj and target
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for entity_index in range(1, other.specificity + 1):
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if self[entity_index] != other[entity_index] and other[entity_index] is not None:
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return False
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return True
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def maps_same_entities_as(self, other):
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if self.specificity != other.specificity:
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return False
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# Compare archive, obj and target
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for entity_index in range(1, other.specificity + 1):
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if self[entity_index] != other[entity_index] and other[entity_index] is not None:
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return False
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return True
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def __getitem__(self, key):
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if key == PlacementRule.ARCHIVE_SPECIFICITY:
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return self.archive
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elif key == PlacementRule.OBJECT_SPECIFICITY:
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return self.obj
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elif key == PlacementRule.SYMBOL_SPECIFICITY:
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return self.symbol
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else:
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return None
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def __str__(self):
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sorted_sections = sorted(self.get_section_names())
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sections_string = list()
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for section in sorted_sections:
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exclusions = self.sections[section].excludes.content
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exclusion_string = None
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if exclusions:
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exclusion_string = " ".join(map(lambda e: "*" + e.archive + (":" + e.obj + ".*" if e.obj else ""), exclusions))
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exclusion_string = "EXCLUDE_FILE(" + exclusion_string + ")"
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else:
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exclusion_string = ""
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section_string = None
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exclusion_section_string = None
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section_expansions = self.sections[section].expansions.content
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section_expanded = self.sections[section].expanded.content
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if section_expansions and section_expanded:
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section_string = " ".join(section_expansions)
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exclusion_section_string = section_string
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else:
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section_string = section
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exclusion_section_string = exclusion_string + " " + section_string
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sections_string.append(exclusion_section_string)
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sections_string = " ".join(sections_string)
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archive = str(self.archive) if self.archive else ""
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obj = (str(self.obj) + (".*" if self.obj else "")) if self.obj else ""
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# Handle output string generation based on information available
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if self.specificity == PlacementRule.DEFAULT_SPECIFICITY:
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rule_string = "*(%s)" % (sections_string)
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elif self.specificity == PlacementRule.ARCHIVE_SPECIFICITY:
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rule_string = "*%s:(%s)" % (archive, sections_string)
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else:
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rule_string = "*%s:%s(%s)" % (archive, obj, sections_string)
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return rule_string
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def __eq__(self, other):
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if id(self) == id(other):
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return True
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def exclusions_set(exclusions):
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exclusions_set = {(e.archive, e.obj, e.symbol, e.target) for e in exclusions}
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return exclusions_set
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if self.archive != other.archive:
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return False
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if self.obj != other.obj:
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return False
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if self.symbol != other.symbol:
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return False
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if set(self.sections.keys()) != set(other.sections.keys()):
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return False
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for (section, metadata) in self.sections.items():
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self_meta = metadata
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other_meta = other.sections[section]
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if exclusions_set(self_meta.excludes.content) != exclusions_set(other_meta.excludes.content):
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return False
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if set(self_meta.expansions.content) != set(other_meta.expansions.content):
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return False
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return True
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def __ne__(self, other):
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return not self.__eq__(other)
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def __iter__(self):
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yield self.archive
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yield self.obj
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yield self.symbol
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raise StopIteration
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class GenerationModel:
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"""
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Implements generation of placement rules based on collected sections, scheme and mapping fragment.
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"""
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DEFAULT_SCHEME = "default"
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def __init__(self):
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self.schemes = {}
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self.sections = {}
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self.mappings = {}
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def _add_mapping_rules(self, archive, obj, symbol, scheme_name, scheme_dict, rules):
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# Use an ordinary dictionary to raise exception on non-existing keys
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temp_dict = dict(scheme_dict)
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sections_bucket = temp_dict[scheme_name]
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for (target, sections) in sections_bucket.items():
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section_entries = []
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for section in sections:
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section_entries.extend(section.entries)
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rule = PlacementRule(archive, obj, symbol, section_entries, target)
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if rule not in rules:
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rules.append(rule)
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def _build_scheme_dictionary(self):
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scheme_dictionary = collections.defaultdict(dict)
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# Collect sections into buckets based on target name
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for scheme in self.schemes.values():
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sections_bucket = collections.defaultdict(list)
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for (sections_name, target_name) in scheme.entries:
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# Get the sections under the bucket 'target_name'. If this bucket does not exist
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# is is created automatically
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sections_in_bucket = sections_bucket[target_name]
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try:
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sections = self.sections[sections_name]
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except KeyError:
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message = GenerationException.UNDEFINED_REFERENCE + " to sections '" + sections + "'."
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raise GenerationException(message, scheme)
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sections_in_bucket.append(sections)
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scheme_dictionary[scheme.name] = sections_bucket
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# Search for and raise exception on first instance of sections mapped to multiple targets
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for (scheme_name, sections_bucket) in scheme_dictionary.items():
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for sections_a, sections_b in itertools.combinations(sections_bucket.values(), 2):
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set_a = set()
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set_b = set()
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for sections in sections_a:
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set_a.update(sections.entries)
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for sections in sections_b:
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set_b.update(sections.entries)
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intersection = set_a.intersection(set_b)
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# If the intersection is a non-empty set, it means sections are mapped to multiple
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# targets. Raise exception.
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if intersection:
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scheme = self.schemes[scheme_name]
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message = "Sections " + str(intersection) + " mapped to multiple targets."
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raise GenerationException(message, scheme)
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return scheme_dictionary
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def generate_rules(self, sdkconfig, sections_infos):
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placement_rules = collections.defaultdict(list)
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scheme_dictionary = self._build_scheme_dictionary()
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# Generate default rules
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default_rules = list()
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self._add_mapping_rules(None, None, None, GenerationModel.DEFAULT_SCHEME, scheme_dictionary, default_rules)
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all_mapping_rules = collections.defaultdict(list)
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# Generate rules based on mapping fragments
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for mapping in self.mappings.values():
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for (condition, entries) in mapping.entries:
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condition_true = False
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# Only non-default condition are evaluated agains sdkconfig model
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if condition != Mapping.DEFAULT_CONDITION:
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try:
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condition_true = sdkconfig.evaluate_expression(condition)
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except Exception as e:
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raise GenerationException(e.message, mapping)
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else:
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condition_true = True
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if condition_true:
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mapping_rules = list()
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archive = mapping.archive
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for (obj, symbol, scheme_name) in entries:
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try:
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self._add_mapping_rules(archive, obj, symbol, scheme_name, scheme_dictionary, mapping_rules)
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except KeyError:
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message = GenerationException.UNDEFINED_REFERENCE + " to scheme '" + scheme_name + "'."
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raise GenerationException(message, mapping)
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all_mapping_rules[mapping.name] = mapping_rules
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break # Exit on first condition that evaluates to true
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# Detect rule conflicts
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for mapping_rules in all_mapping_rules.items():
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self._detect_conflicts(mapping_rules)
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# Add exclusions
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for mapping_rules in all_mapping_rules.values():
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self._create_exclusions(mapping_rules, default_rules, sections_infos)
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# Add the default rules grouped by target
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for default_rule in default_rules:
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existing_rules = placement_rules[default_rule.target]
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if default_rule.get_section_names():
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existing_rules.append(default_rule)
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for mapping_rules in all_mapping_rules.values():
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# Add the mapping rules grouped by target
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for mapping_rule in mapping_rules:
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existing_rules = placement_rules[mapping_rule.target]
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if mapping_rule.get_section_names():
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existing_rules.append(mapping_rule)
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return placement_rules
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def _detect_conflicts(self, rules):
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(archive, rules_list) = rules
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for specificity in range(0, PlacementRule.OBJECT_SPECIFICITY + 1):
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rules_with_specificity = filter(lambda r: r.specificity == specificity, rules_list)
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for rule_a, rule_b in itertools.combinations(rules_with_specificity, 2):
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intersections = rule_a.get_sections_intersection(rule_b)
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if intersections and rule_a.maps_same_entities_as(rule_b):
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rules_string = str([str(rule_a), str(rule_b)])
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message = "Rules " + rules_string + " map sections " + str(list(intersections)) + " into multiple targets."
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mapping = self.mappings[Mapping.get_mapping_name_from_archive(archive)]
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raise GenerationException(message, mapping)
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def _create_extra_rules(self, rules):
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# This function generates extra rules for symbol specific rules. The reason for generating extra rules is to isolate,
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# as much as possible, rules that require expansion. Particularly, object specific extra rules are generated.
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rules_to_process = sorted(rules, key=lambda r: r.specificity)
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symbol_specific_rules = list(filter(lambda r: r.specificity == PlacementRule.SYMBOL_SPECIFICITY, rules_to_process))
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extra_rules = dict()
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for symbol_specific_rule in symbol_specific_rules:
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extra_rule_candidate = {s: None for s in symbol_specific_rule.get_section_names()}
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super_rules = filter(lambda r: symbol_specific_rule.is_more_specific_rule_of(r), rules_to_process)
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# Take a look at the existing rules that are more general than the current symbol-specific rule.
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# Only generate an extra rule if there is no existing object specific rule for that section
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for super_rule in super_rules:
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intersections = symbol_specific_rule.get_sections_intersection(super_rule)
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for intersection in intersections:
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if super_rule.specificity != PlacementRule.OBJECT_SPECIFICITY:
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extra_rule_candidate[intersection] = super_rule
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else:
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extra_rule_candidate[intersection] = None
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# Generate the extra rules for the symbol specific rule section, keeping track of the generated extra rules
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for (section, section_rule) in extra_rule_candidate.items():
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if section_rule:
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extra_rule = None
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extra_rules_key = (symbol_specific_rule.archive, symbol_specific_rule.obj, section_rule.target)
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try:
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extra_rule = extra_rules[extra_rules_key]
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if section not in extra_rule.get_section_names():
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new_rule = PlacementRule(extra_rule.archive, extra_rule.obj, extra_rule.symbol,
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list(extra_rule.get_section_names()) + [section], extra_rule.target)
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extra_rules[extra_rules_key] = new_rule
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except KeyError:
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extra_rule = PlacementRule(symbol_specific_rule.archive, symbol_specific_rule.obj, None, [section], section_rule.target)
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extra_rules[extra_rules_key] = extra_rule
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return extra_rules.values()
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def _create_exclusions(self, mapping_rules, default_rules, sections_info):
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rules = list(default_rules)
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rules.extend(mapping_rules)
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extra_rules = self._create_extra_rules(rules)
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mapping_rules.extend(extra_rules)
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rules.extend(extra_rules)
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# Sort the rules by means of how specific they are. Sort by specificity from lowest to highest
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# * -> lib:* -> lib:obj -> lib:obj:symbol
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sorted_rules = sorted(rules, key=lambda r: r.specificity)
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# Now that the rules have been sorted, loop through each rule, and then loop
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# through rules below it (higher indeces), adding exclusions whenever appropriate.
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for general_rule in sorted_rules:
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for specific_rule in reversed(sorted_rules):
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if (specific_rule.specificity > general_rule.specificity and
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specific_rule.specificity != PlacementRule.SYMBOL_SPECIFICITY) or \
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(specific_rule.specificity == PlacementRule.SYMBOL_SPECIFICITY and
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general_rule.specificity == PlacementRule.OBJECT_SPECIFICITY):
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general_rule.add_exclusion(specific_rule, sections_info)
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def add_fragments_from_file(self, fragment_file):
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for fragment in fragment_file.fragments:
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dict_to_append_to = None
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if isinstance(fragment, Scheme):
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dict_to_append_to = self.schemes
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elif isinstance(fragment, Sections):
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dict_to_append_to = self.sections
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else:
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dict_to_append_to = self.mappings
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# Raise exception when the fragment of the same type is already in the stored fragments
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if fragment.name in dict_to_append_to.keys():
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stored = dict_to_append_to[fragment.name].path
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new = fragment.path
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message = "Duplicate definition of fragment '%s' found in %s and %s." % (fragment.name, stored, new)
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raise GenerationException(message)
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dict_to_append_to[fragment.name] = fragment
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class TemplateModel:
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"""
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Encapsulates a linker script template file. Finds marker syntax and handles replacement to generate the
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final output.
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"""
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Marker = collections.namedtuple("Marker", "target indent rules")
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def __init__(self, template_file):
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self.members = []
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self.file = os.path.realpath(template_file.name)
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self._generate_members(template_file)
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def _generate_members(self, template_file):
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lines = template_file.readlines()
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target = Fragment.IDENTIFIER
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reference = Suppress("mapping") + Suppress("[") + target.setResultsName("target") + Suppress("]")
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pattern = White(" \t").setResultsName("indent") + reference
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# Find the markers in the template file line by line. If line does not match marker grammar,
|
|
# set it as a literal to be copied as is to the output file.
|
|
for line in lines:
|
|
try:
|
|
parsed = pattern.parseString(line)
|
|
|
|
indent = parsed.indent
|
|
target = parsed.target
|
|
|
|
marker = TemplateModel.Marker(target, indent, [])
|
|
|
|
self.members.append(marker)
|
|
except ParseException:
|
|
# Does not match marker syntax
|
|
self.members.append(line)
|
|
|
|
def fill(self, mapping_rules, sdkconfig):
|
|
for member in self.members:
|
|
target = None
|
|
try:
|
|
target = member.target
|
|
rules = member.rules
|
|
|
|
del rules[:]
|
|
|
|
rules.extend(mapping_rules[target])
|
|
except KeyError:
|
|
message = GenerationException.UNDEFINED_REFERENCE + " to target '" + target + "'."
|
|
raise GenerationException(message)
|
|
except AttributeError:
|
|
pass
|
|
|
|
def write(self, output_file):
|
|
# Add information that this is a generated file.
|
|
output_file.write("/* Automatically generated file; DO NOT EDIT */\n")
|
|
output_file.write("/* Espressif IoT Development Framework Linker Script */\n")
|
|
output_file.write("/* Generated from: %s */\n" % self.file)
|
|
output_file.write("\n")
|
|
|
|
# Do the text replacement
|
|
for member in self.members:
|
|
try:
|
|
indent = member.indent
|
|
rules = member.rules
|
|
|
|
for rule in rules:
|
|
generated_line = "".join([indent, str(rule), '\n'])
|
|
output_file.write(generated_line)
|
|
except AttributeError:
|
|
output_file.write(member)
|
|
|
|
|
|
class GenerationException(LdGenFailure):
|
|
"""
|
|
Exception for linker script generation failures such as undefined references/ failure to
|
|
evaluate conditions, duplicate mappings, etc.
|
|
"""
|
|
|
|
UNDEFINED_REFERENCE = "Undefined reference"
|
|
|
|
def __init__(self, message, fragment=None):
|
|
self.fragment = fragment
|
|
self.message = message
|
|
|
|
def __str__(self):
|
|
if self.fragment:
|
|
return "%s\nIn fragment '%s' defined in '%s'." % (self.message, self.fragment.name, self.fragment.path)
|
|
else:
|
|
return self.message
|
|
|
|
|
|
class SectionsInfo(dict):
|
|
"""
|
|
Encapsulates an output of objdump. Contains information about the static library sections
|
|
and names
|
|
"""
|
|
|
|
__info = collections.namedtuple("__info", "filename content")
|
|
|
|
def __init__(self):
|
|
self.sections = dict()
|
|
|
|
def add_sections_info(self, sections_info_file):
|
|
first_line = sections_info_file.readline()
|
|
|
|
archive_path = Literal("In archive").suppress() + Regex(r"[^:]+").setResultsName("archive_path") + Literal(":").suppress()
|
|
parser = archive_path
|
|
|
|
results = None
|
|
|
|
try:
|
|
results = parser.parseString(first_line)
|
|
except ParseException as p:
|
|
raise ParseException("File " + sections_info_file.name + " is not a valid sections info file. " + p.message)
|
|
|
|
archive = os.path.basename(results.archive_path)
|
|
self.sections[archive] = SectionsInfo.__info(sections_info_file.name, sections_info_file.read())
|
|
|
|
def _get_infos_from_file(self, info):
|
|
# Object file line: '{object}: file format elf32-xtensa-le'
|
|
object = Fragment.ENTITY.setResultsName("object") + Literal(":").suppress() + Literal("file format elf32-xtensa-le").suppress()
|
|
|
|
# Sections table
|
|
header = Suppress(Literal("Sections:") + Literal("Idx") + Literal("Name") + Literal("Size") + Literal("VMA") +
|
|
Literal("LMA") + Literal("File off") + Literal("Algn"))
|
|
entry = Word(nums).suppress() + Fragment.ENTITY + Suppress(OneOrMore(Word(alphanums, exact=8)) +
|
|
Word(nums + "*") + ZeroOrMore(Word(alphas.upper()) +
|
|
Optional(Literal(","))))
|
|
|
|
# Content is object file line + sections table
|
|
content = Group(object + header + Group(ZeroOrMore(entry)).setResultsName("sections"))
|
|
|
|
parser = Group(ZeroOrMore(content)).setResultsName("contents")
|
|
|
|
sections_info_text = info.content
|
|
results = None
|
|
|
|
try:
|
|
results = parser.parseString(sections_info_text)
|
|
except ParseException as p:
|
|
raise ParseException("Unable to parse section info file " + info.filename + ". " + p.message)
|
|
|
|
return results
|
|
|
|
def get_obj_sections(self, archive, obj):
|
|
stored = self.sections[archive]
|
|
|
|
# Parse the contents of the sections file
|
|
if not isinstance(stored, dict):
|
|
parsed = self._get_infos_from_file(stored)
|
|
stored = dict()
|
|
for content in parsed.contents:
|
|
sections = list(map(lambda s: s, content.sections))
|
|
stored[content.object] = sections
|
|
self.sections[archive] = stored
|
|
|
|
for obj_key in stored.keys():
|
|
if obj_key == obj + ".o" or obj_key == obj + ".c.obj":
|
|
return stored[obj_key]
|