forked from NUDT-compiler/nudt-compiler-cpp
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107 lines
4.1 KiB
107 lines
4.1 KiB
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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#include "misc/MurmurHash.h"
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#include "atn/PredictionContext.h"
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#include "SemanticContext.h"
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#include "atn/ATNConfig.h"
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using namespace antlr4::atn;
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namespace {
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/**
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* This field stores the bit mask for implementing the
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* {@link #isPrecedenceFilterSuppressed} property as a bit within the
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* existing {@link #reachesIntoOuterContext} field.
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*/
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inline constexpr size_t SUPPRESS_PRECEDENCE_FILTER = 0x40000000;
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}
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ATNConfig::ATNConfig(ATNState *state, size_t alt, Ref<const PredictionContext> context)
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: ATNConfig(state, alt, std::move(context), 0, SemanticContext::Empty::Instance) {}
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ATNConfig::ATNConfig(ATNState *state, size_t alt, Ref<const PredictionContext> context, Ref<const SemanticContext> semanticContext)
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: ATNConfig(state, alt, std::move(context), 0, std::move(semanticContext)) {}
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ATNConfig::ATNConfig(ATNConfig const& other, Ref<const SemanticContext> semanticContext)
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: ATNConfig(other.state, other.alt, other.context, other.reachesIntoOuterContext, std::move(semanticContext)) {}
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ATNConfig::ATNConfig(ATNConfig const& other, ATNState *state)
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: ATNConfig(state, other.alt, other.context, other.reachesIntoOuterContext, other.semanticContext) {}
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ATNConfig::ATNConfig(ATNConfig const& other, ATNState *state, Ref<const SemanticContext> semanticContext)
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: ATNConfig(state, other.alt, other.context, other.reachesIntoOuterContext, std::move(semanticContext)) {}
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ATNConfig::ATNConfig(ATNConfig const& other, ATNState *state, Ref<const PredictionContext> context)
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: ATNConfig(state, other.alt, std::move(context), other.reachesIntoOuterContext, other.semanticContext) {}
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ATNConfig::ATNConfig(ATNConfig const& other, ATNState *state, Ref<const PredictionContext> context, Ref<const SemanticContext> semanticContext)
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: ATNConfig(state, other.alt, std::move(context), other.reachesIntoOuterContext, std::move(semanticContext)) {}
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ATNConfig::ATNConfig(ATNState *state, size_t alt, Ref<const PredictionContext> context, size_t reachesIntoOuterContext, Ref<const SemanticContext> semanticContext)
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: state(state), alt(alt), context(std::move(context)), reachesIntoOuterContext(reachesIntoOuterContext), semanticContext(std::move(semanticContext)) {}
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size_t ATNConfig::hashCode() const {
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size_t hashCode = misc::MurmurHash::initialize(7);
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hashCode = misc::MurmurHash::update(hashCode, state->stateNumber);
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hashCode = misc::MurmurHash::update(hashCode, alt);
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hashCode = misc::MurmurHash::update(hashCode, context);
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hashCode = misc::MurmurHash::update(hashCode, semanticContext);
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hashCode = misc::MurmurHash::finish(hashCode, 4);
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return hashCode;
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}
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size_t ATNConfig::getOuterContextDepth() const {
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return reachesIntoOuterContext & ~SUPPRESS_PRECEDENCE_FILTER;
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}
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bool ATNConfig::isPrecedenceFilterSuppressed() const {
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return (reachesIntoOuterContext & SUPPRESS_PRECEDENCE_FILTER) != 0;
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}
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void ATNConfig::setPrecedenceFilterSuppressed(bool value) {
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if (value) {
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reachesIntoOuterContext |= SUPPRESS_PRECEDENCE_FILTER;
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} else {
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reachesIntoOuterContext &= ~SUPPRESS_PRECEDENCE_FILTER;
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}
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}
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bool ATNConfig::operator==(const ATNConfig &other) const {
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return state->stateNumber == other.state->stateNumber && alt == other.alt &&
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((context == other.context) || (*context == *other.context)) &&
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*semanticContext == *other.semanticContext &&
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isPrecedenceFilterSuppressed() == other.isPrecedenceFilterSuppressed();
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}
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std::string ATNConfig::toString() const {
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return toString(true);
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}
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std::string ATNConfig::toString(bool showAlt) const {
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std::stringstream ss;
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ss << "(";
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ss << state->toString();
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if (showAlt) {
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ss << "," << alt;
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}
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if (context) {
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ss << ",[" << context->toString() << "]";
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}
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if (semanticContext != nullptr && semanticContext != SemanticContext::Empty::Instance) {
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ss << "," << semanticContext->toString();
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}
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if (getOuterContextDepth() > 0) {
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ss << ",up=" << getOuterContextDepth();
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}
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ss << ")";
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return ss.str();
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}
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