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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
#include "atn/PredicateEvalInfo.h"
#include "atn/LookaheadEventInfo.h"
#include "Parser.h"
#include "atn/ATNConfigSet.h"
#include "support/CPPUtils.h"
#include "atn/ProfilingATNSimulator.h"
using namespace antlr4;
using namespace antlr4::atn;
using namespace antlr4::dfa;
using namespace antlrcpp;
using namespace std::chrono;
ProfilingATNSimulator::ProfilingATNSimulator(Parser *parser)
: ParserATNSimulator(parser, parser->getInterpreter<ParserATNSimulator>()->atn,
parser->getInterpreter<ParserATNSimulator>()->decisionToDFA,
parser->getInterpreter<ParserATNSimulator>()->getSharedContextCache()) {
for (size_t i = 0; i < atn.decisionToState.size(); i++) {
_decisions.push_back(DecisionInfo(i));
}
}
size_t ProfilingATNSimulator::adaptivePredict(TokenStream *input, size_t decision, ParserRuleContext *outerContext) {
auto onExit = finally([this](){
_currentDecision = 0; // Originally -1, but that makes no sense (index into a vector and init value is also 0).
});
_sllStopIndex = -1;
_llStopIndex = -1;
_currentDecision = decision;
high_resolution_clock::time_point start = high_resolution_clock::now();
size_t alt = ParserATNSimulator::adaptivePredict(input, decision, outerContext);
high_resolution_clock::time_point stop = high_resolution_clock::now();
_decisions[decision].timeInPrediction += duration_cast<nanoseconds>(stop - start).count();
_decisions[decision].invocations++;
long long SLL_k = _sllStopIndex - _startIndex + 1;
_decisions[decision].SLL_TotalLook += SLL_k;
_decisions[decision].SLL_MinLook = _decisions[decision].SLL_MinLook == 0 ? SLL_k : std::min(_decisions[decision].SLL_MinLook, SLL_k);
if (SLL_k > _decisions[decision].SLL_MaxLook) {
_decisions[decision].SLL_MaxLook = SLL_k;
_decisions[decision].SLL_MaxLookEvent = std::make_shared<LookaheadEventInfo>(decision, nullptr, alt, input, _startIndex, _sllStopIndex, false);
}
if (_llStopIndex >= 0) {
long long LL_k = _llStopIndex - _startIndex + 1;
_decisions[decision].LL_TotalLook += LL_k;
_decisions[decision].LL_MinLook = _decisions[decision].LL_MinLook == 0 ? LL_k : std::min(_decisions[decision].LL_MinLook, LL_k);
if (LL_k > _decisions[decision].LL_MaxLook) {
_decisions[decision].LL_MaxLook = LL_k;
_decisions[decision].LL_MaxLookEvent = std::make_shared<LookaheadEventInfo>(decision, nullptr, alt, input, _startIndex, _llStopIndex, true);
}
}
return alt;
}
DFAState* ProfilingATNSimulator::getExistingTargetState(DFAState *previousD, size_t t) {
// this method is called after each time the input position advances
// during SLL prediction
_sllStopIndex = (int)_input->index();
DFAState *existingTargetState = ParserATNSimulator::getExistingTargetState(previousD, t);
if (existingTargetState != nullptr) {
_decisions[_currentDecision].SLL_DFATransitions++; // count only if we transition over a DFA state
if (existingTargetState == ERROR.get()) {
_decisions[_currentDecision].errors.push_back(
ErrorInfo(_currentDecision, previousD->configs.get(), _input, _startIndex, _sllStopIndex, false)
);
}
}
_currentState = existingTargetState;
return existingTargetState;
}
DFAState* ProfilingATNSimulator::computeTargetState(DFA &dfa, DFAState *previousD, size_t t) {
DFAState *state = ParserATNSimulator::computeTargetState(dfa, previousD, t);
_currentState = state;
return state;
}
std::unique_ptr<ATNConfigSet> ProfilingATNSimulator::computeReachSet(ATNConfigSet *closure, size_t t, bool fullCtx) {
if (fullCtx) {
// this method is called after each time the input position advances
// during full context prediction
_llStopIndex = (int)_input->index();
}
std::unique_ptr<ATNConfigSet> reachConfigs = ParserATNSimulator::computeReachSet(closure, t, fullCtx);
if (fullCtx) {
_decisions[_currentDecision].LL_ATNTransitions++; // count computation even if error
if (reachConfigs != nullptr) {
} else { // no reach on current lookahead symbol. ERROR.
// TODO: does not handle delayed errors per getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule()
_decisions[_currentDecision].errors.push_back(ErrorInfo(_currentDecision, closure, _input, _startIndex, _llStopIndex, true));
}
} else {
++_decisions[_currentDecision].SLL_ATNTransitions;
if (reachConfigs != nullptr) {
} else { // no reach on current lookahead symbol. ERROR.
_decisions[_currentDecision].errors.push_back(ErrorInfo(_currentDecision, closure, _input, _startIndex, _sllStopIndex, false));
}
}
return reachConfigs;
}
bool ProfilingATNSimulator::evalSemanticContext(Ref<const SemanticContext> const& pred, ParserRuleContext *parserCallStack,
size_t alt, bool fullCtx) {
bool result = ParserATNSimulator::evalSemanticContext(pred, parserCallStack, alt, fullCtx);
if (!(std::dynamic_pointer_cast<const SemanticContext::PrecedencePredicate>(pred) != nullptr)) {
bool fullContext = _llStopIndex >= 0;
int stopIndex = fullContext ? _llStopIndex : _sllStopIndex;
_decisions[_currentDecision].predicateEvals.push_back(
PredicateEvalInfo(_currentDecision, _input, _startIndex, stopIndex, pred, result, alt, fullCtx));
}
return result;
}
void ProfilingATNSimulator::reportAttemptingFullContext(DFA &dfa, const BitSet &conflictingAlts, ATNConfigSet *configs,
size_t startIndex, size_t stopIndex) {
if (conflictingAlts.count() > 0) {
conflictingAltResolvedBySLL = conflictingAlts.nextSetBit(0);
} else {
conflictingAltResolvedBySLL = configs->getAlts().nextSetBit(0);
}
_decisions[_currentDecision].LL_Fallback++;
ParserATNSimulator::reportAttemptingFullContext(dfa, conflictingAlts, configs, startIndex, stopIndex);
}
void ProfilingATNSimulator::reportContextSensitivity(DFA &dfa, size_t prediction, ATNConfigSet *configs,
size_t startIndex, size_t stopIndex) {
if (prediction != conflictingAltResolvedBySLL) {
_decisions[_currentDecision].contextSensitivities.push_back(
ContextSensitivityInfo(_currentDecision, configs, _input, startIndex, stopIndex)
);
}
ParserATNSimulator::reportContextSensitivity(dfa, prediction, configs, startIndex, stopIndex);
}
void ProfilingATNSimulator::reportAmbiguity(DFA &dfa, DFAState *D, size_t startIndex, size_t stopIndex, bool exact,
const BitSet &ambigAlts, ATNConfigSet *configs) {
size_t prediction;
if (ambigAlts.count() > 0) {
prediction = ambigAlts.nextSetBit(0);
} else {
prediction = configs->getAlts().nextSetBit(0);
}
if (configs->fullCtx && prediction != conflictingAltResolvedBySLL) {
// 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[_currentDecision].contextSensitivities.push_back(
ContextSensitivityInfo(_currentDecision, configs, _input, startIndex, stopIndex)
);
}
_decisions[_currentDecision].ambiguities.push_back(
AmbiguityInfo(_currentDecision, configs, ambigAlts, _input, startIndex, stopIndex, configs->fullCtx)
);
ParserATNSimulator::reportAmbiguity(dfa, D, startIndex, stopIndex, exact, ambigAlts, configs);
}
std::vector<DecisionInfo> ProfilingATNSimulator::getDecisionInfo() const {
return _decisions;
}
DFAState* ProfilingATNSimulator::getCurrentState() const {
return _currentState;
}
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