Class: Antlr4::Runtime::ProfilingATNSimulator

Inherits:
ParserATNSimulator show all
Defined in:
lib/antlr4/runtime/profiling_atn_simulator.rb

Constant Summary

Constants inherited from ParserATNSimulator

Antlr4::Runtime::ParserATNSimulator::TURN_OFF_LR_LOOP_ENTRY_BRANCH_OPT

Constants inherited from ATNSimulator

ATNSimulator::SERIALIZED_UUID, ATNSimulator::SERIALIZED_VERSION

Instance Attribute Summary

Attributes inherited from ParserATNSimulator

#debug, #debug_list_atn_decisions, #dfa_debug, #retry_debug

Attributes inherited from ATNSimulator

#atn, #shared_context_cache

Instance Method Summary collapse

Methods inherited from ParserATNSimulator

#action_transition, #add_dfa_edge, #add_dfa_state, #alt_that_finished_decision_entry_rule, #apply_precedence_filter, #can_drop_loop_entry_edge_in_left_recursive_rule?, #clear_dfa, #closure, #closure_, #closure_checking_stop_state, #compute_start_state, #conflicting_alts, #conflicting_alts_or_unique_alt, #dump_dead_end_configs, #epsilon_target, #eval_semantic_context1, #eval_semantic_context2, #exec_atn, #exec_atn_with_full_context, get_safe_env, #lookahead_name, #precedence_transition, #pred_transition, #predicate_dfa_state, #predicate_predictions, #preds_for_ambig_alts, #reachable_target, #remove_all_configs_not_in_rule_stop_state, #rule_name, #rule_transition, #split_according_to_semantic_validity, #syn_valid_or_sem_invalid_alt_that_finished_decision_entry_rule, #token_name, #unique_alt

Methods inherited from ATNSimulator

#cached_context, check_condition, #clear_dfa, deserialize, #edge_factory, #state_factory, to_int, to_int32, to_long, to_uuid

Constructor Details

#initialize(parser) ⇒ ProfilingATNSimulator 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 3

def initialize(parser)
  super(parser, parser._interp.atn, parser._interp.decision_to_dfa, parser._interp.shared_context_cache)

  @num_decisions = @atn.decision_to_state.size
  @_sll_stop_index = 0
  @_ll_stop_index = 0
  @current_decision = 0
  @current_state = nil
  @conflicting_alt_resolved_by_sll = 0

  @decisions = Array.new(@numDecisions)
  i = 0
  while i < @num_decisions
    @decisions[i] = DecisionInfo.new(i)
    i += 1
  end
end

Instance Method Details

#adaptive_predict(input, decision, outer_ctx) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 21

def adaptive_predict(input, decision, outer_ctx)
  @_sll_stop_index = -1
  @_ll_stop_index = -1
  @current_decision = decision
  start = Time.now # expensive but useful info
  alt = super.adaptive_predict(input, decision, outer_ctx)
  stop = Time.now
  @decisions[decision].timeInPrediction += (stop - start)
  @decisions[decision].invocations += 1

  _s_ll_k = @_sll_stop_index - @_start_index + 1
  @decisions[decision].SLL_TotalLook += _s_ll_k
  @decisions[decision].SLL_MinLook = @decisions[decision].SLL_MinLook == 0 ? _s_ll_k : Math.min(@decisions[decision].SLL_MinLook, _s_ll_k)
  if _s_ll_k > @decisions[decision].SLL_MaxLook
    @decisions[decision].SLL_MaxLook = _s_ll_k
    @decisions[decision].SLL_MaxLookEvent = LookaheadEventInfo.new(decision, nil, alt, input, @_start_index, @_sll_stop_index, false)
  end

  if @_ll_stop_index >= 0
    _ll_k = @_ll_stop_index - @_start_index + 1
    @decisions[decision].LL_TotalLook += _ll_k
    @decisions[decision].LL_MinLook = @decisions[decision].LL_MinLook == 0 ? _ll_k : Math.min(@decisions[decision].LL_MinLook, _ll_k)
    if _ll_k > @decisions[decision].LL_MaxLook
      @decisions[decision].LL_MaxLook = _ll_k
      @decisions[decision].LL_MaxLookEvent = LookaheadEventInfo.new(decision, nil, alt, input, @_start_index, @_ll_stop_index, true)
    end
  end

  alt
ensure
  @current_decision = -1
end

#compute_reach_set(closure, t, full_ctx) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 76

def compute_reach_set(closure, t, full_ctx)
  if full_ctx
    # this method is called after each time the input position advances
    # during full context prediction
    @_ll_stop_index = @_input.index
  end

  reach_configs = super.compute_reach_set(closure, t, full_ctx)
  if full_ctx
    @decisions[@current_decision].LL_ATNTransitions += 1 # count computation even if error
    if !reach_configs.nil?
    else # no reach on current lookahead symbol. ERROR.
      # TODO: does not handle delayed errors per getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule()
      @decisions[@current_decision].errors.add(ErrorInfo.new(@current_decision, closure, @_input, @_start_index, @_ll_stop_index, true))
    end
  else
    @decisions[@current_decision].SLL_ATNTransitions += 1
    if !reach_configs.nil?
    else # no reach on current lookahead symbol. ERROR.
      @decisions[@current_decision].errors.add(ErrorInfo.new(@current_decision, closure, @_input, @_start_index, @_sll_stop_index, false))
    end
  end

  reach_configs
end

#compute_target_state(dfa, prev_d, t) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 70

def compute_target_state(dfa, prev_d, t)
  state = super.compute_target_state(dfa, prev_d, t)
  @current_state = state
  state
end

#eval_semantic_context(pred, parser_call_stack, alt, full_ctx) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 102

def eval_semantic_context(pred, parser_call_stack, alt, full_ctx)
  result = super.eval_semantic_context(pred, parser_call_stack, alt, full_ctx)
  unless pred.is_a? SemanticContext.PrecedencePredicate
    full_context = (@_ll_stop_index >= 0)
    stop_index = full_context ? @_ll_stop_index : @_sll_stop_index
    @decisions[@current_decision].predicate_evals.add(PredicateEvalInfo.new(@current_decision, @_input, @_start_index, stop_index, pred, result, alt, full_ctx))
  end

  result
end

#existing_target_state(prev_d, t) ⇒ Object

this method is called after each time the input position advances



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 54

def existing_target_state(prev_d, t) # this method is called after each time the input position advances
  # during SLL prediction
  @_sll_stop_index = @_input.index

  existing_tgt_state = super.existing_target_state(prev_d, t)
  unless existing_tgt_state.nil?
    @decisions[@current_decision].SLL_DFATransitions += 1 # count only if we transition over a DFA state
    if existing_tgt_state == @@error
      @decisions[@current_decision].errors.add(ErrorInfo.new(@current_decision, prev_d.configs, @_input, @_start_index, @_sll_stop_index, false))
    end
  end

  @current_state = existing_tgt_state
  existing_tgt_state
end

#report_ambiguity(dfa, _d, start_index, stop_index, exact, ambig_alts, configs) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 130

def report_ambiguity(dfa, _d, start_index, stop_index, exact, ambig_alts, configs)
  prediction = if !ambig_alts.nil?
                 ambig_alts.next_set_bit(0)
               else
                 configs.alts.next_set_bit(0)
               end

  if configs.full_ctx && prediction != @conflicting_alt_resolved_by_sll
    # Even though this is an ambiguity we are reporting, we can
    # still detect some context sensitivities.  Both SLL and LL
    # are showing a conflict, hence an ambiguity, but if they resolve
    # to different minimum alternatives we have also identified a
    # context sensitivity.
    @decisions[@current_decision].context_sensitivities.add(ContextSensitivityInfo.new(@current_decision, configs, @_input, start_index, stop_index))
  end
  @decisions[@current_decision].ambiguities.add(AmbiguityInfo.new(@current_decision, configs, ambig_alts, @_input, start_index, stop_index, configs.full_ctx))
  super.report_ambiguity(dfa, _d, start_index, stop_index, exact, ambig_alts, configs)
end

#report_attempting_full_context(dfa, conflicting_alts, configs, start_index, stop_index) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 113

def report_attempting_full_context(dfa, conflicting_alts, configs, start_index, stop_index)
  if !conflicting_alts.nil?
    @conflicting_alt_resolved_by_sll = conflicting_alts.next_set_bit(0)
  else
    @conflicting_alt_resolved_by_sll = configs.alts.next_set_bit(0)
  end
  @decisions[@current_decision].LL_Fallback += 1
  super.report_attempting_full_context(dfa, conflicting_alts, configs, start_index, stop_index)
end

#report_context_sensitivity(dfa, prediction, configs, start_index, stop_index) ⇒ Object 



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# File 'lib/antlr4/runtime/profiling_atn_simulator.rb', line 123

def report_context_sensitivity(dfa, prediction, configs, start_index, stop_index)
  if prediction != @conflicting_alt_resolved_by_sll
    @decisions[@current_decision].context_sensitivities.add(ContextSensitivityInfo.new(@current_decision, configs, @_input, start_index, stop_index))
  end
  super.report_context_sensitivity(dfa, prediction, configs, start_index, stop_index)
end