Intermediate changes

1 files changed, 0 insertions, 579 deletions

diff --git a/contrib/libs/antlr4_cpp_runtime/src/atn/PredictionContext.cpp b/contrib/libs/antlr4_cpp_runtime/src/atn/PredictionContext.cpp
deleted file mode 100644
index 704408f04d5..00000000000
--- a/contrib/libs/antlr4_cpp_runtime/src/atn/PredictionContext.cpp
+++ /dev/null
@@ -1,579 +0,0 @@
-/* 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/SingletonPredictionContext.h"
-#include "misc/MurmurHash.h"
-#include "atn/ArrayPredictionContext.h"
-#include "atn/PredictionContextCache.h"
-#include "atn/PredictionContextMergeCache.h"
-#include "RuleContext.h"
-#include "ParserRuleContext.h"
-#include "atn/RuleTransition.h"
-#include "support/Arrays.h"
-#include "support/CPPUtils.h"
-#include "support/Casts.h"
-
-#include "atn/PredictionContext.h"
-
-using namespace antlr4;
-using namespace antlr4::misc;
-using namespace antlr4::atn;
-using namespace antlrcpp;
-
-namespace {
-
-  void combineCommonParents(std::vector<Ref<const PredictionContext>> &parents) {
-    std::unordered_set<Ref<const PredictionContext>> uniqueParents;
-    uniqueParents.reserve(parents.size());
-    for (const auto &parent : parents) {
-      uniqueParents.insert(parent);
-    }
-    for (auto &parent : parents) {
-      parent = *uniqueParents.find(parent);
-    }
-  }
-
-  Ref<const PredictionContext> getCachedContextImpl(const Ref<const PredictionContext> &context,
-                                                    PredictionContextCache &contextCache,
-                                                    std::unordered_map<Ref<const PredictionContext>,
-                                                    Ref<const PredictionContext>> &visited) {
-    if (context->isEmpty()) {
-      return context;
-    }
-
-    {
-      auto iterator = visited.find(context);
-      if (iterator != visited.end()) {
-        return iterator->second; // Not necessarly the same as context.
-      }
-    }
-
-    auto cached = contextCache.get(context);
-    if (cached) {
-      visited[context] = cached;
-      return cached;
-    }
-
-    bool changed = false;
-
-    std::vector<Ref<const PredictionContext>> parents(context->size());
-    for (size_t i = 0; i < parents.size(); i++) {
-      auto parent = getCachedContextImpl(context->getParent(i), contextCache, visited);
-      if (changed || parent != context->getParent(i)) {
-        if (!changed) {
-          parents.clear();
-          for (size_t j = 0; j < context->size(); j++) {
-            parents.push_back(context->getParent(j));
-          }
-
-          changed = true;
-        }
-
-        parents[i] = std::move(parent);
-      }
-    }
-
-    if (!changed) {
-      visited[context] = context;
-      contextCache.put(context);
-      return context;
-    }
-
-    Ref<const PredictionContext> updated;
-    if (parents.empty()) {
-      updated = PredictionContext::EMPTY;
-    } else if (parents.size() == 1) {
-      updated = SingletonPredictionContext::create(std::move(parents[0]), context->getReturnState(0));
-      contextCache.put(updated);
-    } else {
-      updated = std::make_shared<ArrayPredictionContext>(std::move(parents), downCast<const ArrayPredictionContext*>(context.get())->returnStates);
-      contextCache.put(updated);
-    }
-
-    visited[updated] = updated;
-    visited[context] = updated;
-
-    return updated;
-  }
-
-  void getAllContextNodesImpl(const Ref<const PredictionContext> &context,
-                              std::vector<Ref<const PredictionContext>> &nodes,
-                              std::unordered_set<const PredictionContext*> &visited) {
-
-    if (visited.find(context.get()) != visited.end()) {
-      return; // Already done.
-    }
-
-    visited.insert(context.get());
-    nodes.push_back(context);
-
-    for (size_t i = 0; i < context->size(); i++) {
-      getAllContextNodesImpl(context->getParent(i), nodes, visited);
-    }
-  }
-
-  size_t insertOrAssignNodeId(std::unordered_map<const PredictionContext*, size_t> &nodeIds, size_t &nodeId, const PredictionContext *node) {
-    auto existing = nodeIds.find(node);
-    if (existing != nodeIds.end()) {
-      return existing->second;
-    }
-    return nodeIds.insert({node, nodeId++}).first->second;
-  }
-
-}
-
-const Ref<const PredictionContext> PredictionContext::EMPTY = std::make_shared<SingletonPredictionContext>(nullptr, PredictionContext::EMPTY_RETURN_STATE);
-
-//----------------- PredictionContext ----------------------------------------------------------------------------------
-
-PredictionContext::PredictionContext(PredictionContextType contextType) : _contextType(contextType), _hashCode(0) {}
-
-PredictionContext::PredictionContext(PredictionContext&& other) : _contextType(other._contextType), _hashCode(other._hashCode.exchange(0, std::memory_order_relaxed)) {}
-
-Ref<const PredictionContext> PredictionContext::fromRuleContext(const ATN &atn, RuleContext *outerContext) {
-  if (outerContext == nullptr) {
-    return PredictionContext::EMPTY;
-  }
-
-  // if we are in RuleContext of start rule, s, then PredictionContext
-  // is EMPTY. Nobody called us. (if we are empty, return empty)
-  if (outerContext->parent == nullptr || outerContext == &ParserRuleContext::EMPTY) {
-    return PredictionContext::EMPTY;
-  }
-
-  // If we have a parent, convert it to a PredictionContext graph
-  auto parent = PredictionContext::fromRuleContext(atn, RuleContext::is(outerContext->parent) ? downCast<RuleContext*>(outerContext->parent) : nullptr);
-  const auto *transition = downCast<const RuleTransition*>(atn.states[outerContext->invokingState]->transitions[0].get());
-  return SingletonPredictionContext::create(std::move(parent), transition->followState->stateNumber);
-}
-
-bool PredictionContext::hasEmptyPath() const {
-  // since EMPTY_RETURN_STATE can only appear in the last position, we check last one
-  return getReturnState(size() - 1) == EMPTY_RETURN_STATE;
-}
-
-size_t PredictionContext::hashCode() const {
-  auto hash = cachedHashCode();
-  if (hash == 0) {
-    hash = hashCodeImpl();
-    if (hash == 0) {
-      hash = std::numeric_limits<size_t>::max();
-    }
-    _hashCode.store(hash, std::memory_order_relaxed);
-  }
-  return hash;
-}
-
-Ref<const PredictionContext> PredictionContext::merge(Ref<const PredictionContext> a, Ref<const PredictionContext> b,
-                                                      bool rootIsWildcard, PredictionContextMergeCache *mergeCache) {
-  assert(a && b);
-
-  // share same graph if both same
-  if (a == b || *a == *b) {
-    return a;
-  }
-
-  const auto aType = a->getContextType();
-  const auto bType = b->getContextType();
-
-  if (aType == PredictionContextType::SINGLETON && bType == PredictionContextType::SINGLETON) {
-    return mergeSingletons(std::static_pointer_cast<const SingletonPredictionContext>(std::move(a)),
-                           std::static_pointer_cast<const SingletonPredictionContext>(std::move(b)), rootIsWildcard, mergeCache);
-  }
-
-  // At least one of a or b is array.
-  // If one is $ and rootIsWildcard, return $ as * wildcard.
-  if (rootIsWildcard) {
-    if (a == PredictionContext::EMPTY) {
-      return a;
-    }
-    if (b == PredictionContext::EMPTY) {
-      return b;
-    }
-  }
-
-  // convert singleton so both are arrays to normalize
-  Ref<const ArrayPredictionContext> left;
-  if (aType == PredictionContextType::SINGLETON) {
-    left = std::make_shared<ArrayPredictionContext>(downCast<const SingletonPredictionContext&>(*a));
-  } else {
-    left = std::static_pointer_cast<const ArrayPredictionContext>(std::move(a));
-  }
-  Ref<const ArrayPredictionContext> right;
-  if (bType == PredictionContextType::SINGLETON) {
-    right = std::make_shared<ArrayPredictionContext>(downCast<const SingletonPredictionContext&>(*b));
-  } else {
-    right = std::static_pointer_cast<const ArrayPredictionContext>(std::move(b));
-  }
-  return mergeArrays(std::move(left), std::move(right), rootIsWildcard, mergeCache);
-}
-
-Ref<const PredictionContext> PredictionContext::mergeSingletons(Ref<const SingletonPredictionContext> a, Ref<const SingletonPredictionContext> b,
-                                                                bool rootIsWildcard, PredictionContextMergeCache *mergeCache) {
-
-  if (mergeCache) {
-    auto existing = mergeCache->get(a, b);
-    if (existing) {
-      return existing;
-    }
-    existing = mergeCache->get(b, a);
-    if (existing) {
-      return existing;
-    }
-  }
-
-  auto rootMerge = mergeRoot(a, b, rootIsWildcard);
-  if (rootMerge) {
-    if (mergeCache) {
-      return mergeCache->put(a, b, std::move(rootMerge));
-    }
-    return rootMerge;
-  }
-
-  const auto& parentA = a->parent;
-  const auto& parentB = b->parent;
-  if (a->returnState == b->returnState) { // a == b
-    auto parent = merge(parentA, parentB, rootIsWildcard, mergeCache);
-
-    // If parent is same as existing a or b parent or reduced to a parent, return it.
-    if (parent == parentA) { // ax + bx = ax, if a=b
-      return a;
-    }
-    if (parent == parentB) { // ax + bx = bx, if a=b
-      return b;
-    }
-
-    // else: ax + ay = a'[x,y]
-    // merge parents x and y, giving array node with x,y then remainders
-    // of those graphs.  dup a, a' points at merged array
-    // new joined parent so create new singleton pointing to it, a'
-    auto c = SingletonPredictionContext::create(std::move(parent), a->returnState);
-    if (mergeCache) {
-      return mergeCache->put(a, b, std::move(c));
-    }
-    return c;
-  }
-  // a != b payloads differ
-  // see if we can collapse parents due to $+x parents if local ctx
-  Ref<const PredictionContext> singleParent;
-  if (a == b || (*parentA == *parentB)) { // ax + bx = [a,b]x
-    singleParent = parentA;
-  }
-  if (singleParent) { // parents are same, sort payloads and use same parent
-    std::vector<size_t> payloads = { a->returnState, b->returnState };
-    if (a->returnState > b->returnState) {
-      payloads[0] = b->returnState;
-      payloads[1] = a->returnState;
-    }
-    std::vector<Ref<const PredictionContext>> parents = { singleParent, singleParent };
-    auto c = std::make_shared<ArrayPredictionContext>(std::move(parents), std::move(payloads));
-    if (mergeCache) {
-      return mergeCache->put(a, b, std::move(c));
-    }
-    return c;
-  }
-
-  // parents differ and can't merge them. Just pack together
-  // into array; can't merge.
-  // ax + by = [ax,by]
-  if (a->returnState > b->returnState) { // sort by payload
-    std::vector<size_t> payloads = { b->returnState, a->returnState };
-    std::vector<Ref<const PredictionContext>> parents = { b->parent, a->parent };
-    auto c = std::make_shared<ArrayPredictionContext>(std::move(parents), std::move(payloads));
-    if (mergeCache) {
-      return mergeCache->put(a, b, std::move(c));
-    }
-    return c;
-  }
-  std::vector<size_t> payloads = {a->returnState, b->returnState};
-  std::vector<Ref<const PredictionContext>> parents = { a->parent, b->parent };
-  auto c = std::make_shared<ArrayPredictionContext>(std::move(parents), std::move(payloads));
-  if (mergeCache) {
-    return mergeCache->put(a, b, std::move(c));
-  }
-  return c;
-}
-
-Ref<const PredictionContext> PredictionContext::mergeRoot(Ref<const SingletonPredictionContext> a, Ref<const SingletonPredictionContext> b,
-                                                          bool rootIsWildcard) {
-  if (rootIsWildcard) {
-    if (a == EMPTY) { // * + b = *
-      return EMPTY;
-    }
-    if (b == EMPTY) { // a + * = *
-      return EMPTY;
-    }
-  } else {
-    if (a == EMPTY && b == EMPTY) { // $ + $ = $
-      return EMPTY;
-    }
-    if (a == EMPTY) { // $ + x = [$,x]
-      std::vector<size_t> payloads = { b->returnState, EMPTY_RETURN_STATE };
-      std::vector<Ref<const PredictionContext>> parents = { b->parent, nullptr };
-      return std::make_shared<ArrayPredictionContext>(std::move(parents), std::move(payloads));
-    }
-    if (b == EMPTY) { // x + $ = [$,x] ($ is always first if present)
-      std::vector<size_t> payloads = { a->returnState, EMPTY_RETURN_STATE };
-      std::vector<Ref<const PredictionContext>> parents = { a->parent, nullptr };
-      return std::make_shared<ArrayPredictionContext>(std::move(parents), std::move(payloads));
-    }
-  }
-  return nullptr;
-}
-
-Ref<const PredictionContext> PredictionContext::mergeArrays(Ref<const ArrayPredictionContext> a, Ref<const ArrayPredictionContext> b,
-                                                            bool rootIsWildcard, PredictionContextMergeCache *mergeCache) {
-
-  if (mergeCache) {
-    auto existing = mergeCache->get(a, b);
-    if (existing) {
-      return existing;
-    }
-    existing = mergeCache->get(b, a);
-    if (existing) {
-      return existing;
-    }
-  }
-
-  // merge sorted payloads a + b => M
-  size_t i = 0; // walks a
-  size_t j = 0; // walks b
-  size_t k = 0; // walks target M array
-
-  std::vector<size_t> mergedReturnStates(a->returnStates.size() + b->returnStates.size());
-  std::vector<Ref<const PredictionContext>> mergedParents(a->returnStates.size() + b->returnStates.size());
-
-  // walk and merge to yield mergedParents, mergedReturnStates
-  while (i < a->returnStates.size() && j < b->returnStates.size()) {
-    const auto& parentA = a->parents[i];
-    const auto& parentB = b->parents[j];
-    if (a->returnStates[i] == b->returnStates[j]) {
-      // same payload (stack tops are equal), must yield merged singleton
-      size_t payload = a->returnStates[i];
-      // $+$ = $
-      bool both$ = payload == EMPTY_RETURN_STATE && !parentA && !parentB;
-      bool ax_ax = (parentA && parentB) && *parentA == *parentB; // ax+ax -> ax
-      if (both$ || ax_ax) {
-        mergedParents[k] = parentA; // choose left
-        mergedReturnStates[k] = payload;
-      } else { // ax+ay -> a'[x,y]
-        mergedParents[k] = merge(parentA, parentB, rootIsWildcard, mergeCache);
-        mergedReturnStates[k] = payload;
-      }
-      i++; // hop over left one as usual
-      j++; // but also skip one in right side since we merge
-    } else if (a->returnStates[i] < b->returnStates[j]) { // copy a[i] to M
-      mergedParents[k] = parentA;
-      mergedReturnStates[k] = a->returnStates[i];
-      i++;
-    } else { // b > a, copy b[j] to M
-      mergedParents[k] = parentB;
-      mergedReturnStates[k] = b->returnStates[j];
-      j++;
-    }
-    k++;
-  }
-
-  // copy over any payloads remaining in either array
-  if (i < a->returnStates.size()) {
-    for (auto p = i; p < a->returnStates.size(); p++) {
-      mergedParents[k] = a->parents[p];
-      mergedReturnStates[k] = a->returnStates[p];
-      k++;
-    }
-  } else {
-    for (auto p = j; p < b->returnStates.size(); p++) {
-      mergedParents[k] = b->parents[p];
-      mergedReturnStates[k] = b->returnStates[p];
-      k++;
-    }
-  }
-
-  // trim merged if we combined a few that had same stack tops
-  if (k < mergedParents.size()) { // write index < last position; trim
-    if (k == 1) { // for just one merged element, return singleton top
-      auto c = SingletonPredictionContext::create(std::move(mergedParents[0]), mergedReturnStates[0]);
-      if (mergeCache) {
-        return mergeCache->put(a, b, std::move(c));
-      }
-      return c;
-    }
-    mergedParents.resize(k);
-    mergedReturnStates.resize(k);
-  }
-
-  ArrayPredictionContext m(std::move(mergedParents), std::move(mergedReturnStates));
-
-  // if we created same array as a or b, return that instead
-  // TODO: track whether this is possible above during merge sort for speed
-  if (m == *a) {
-    if (mergeCache) {
-      return mergeCache->put(a, b, a);
-    }
-    return a;
-  }
-  if (m == *b) {
-    if (mergeCache) {
-      return mergeCache->put(a, b, b);
-    }
-    return b;
-  }
-
-  combineCommonParents(m.parents);
-  auto c = std::make_shared<ArrayPredictionContext>(std::move(m));
-  if (mergeCache) {
-    return mergeCache->put(a, b, std::move(c));
-  }
-  return c;
-}
-
-std::string PredictionContext::toDOTString(const Ref<const PredictionContext> &context) {
-  if (context == nullptr) {
-    return "";
-  }
-
-  std::stringstream ss;
-  ss << "digraph G {\n" << "rankdir=LR;\n";
-
-  std::vector<Ref<const PredictionContext>> nodes = getAllContextNodes(context);
-  std::unordered_map<const PredictionContext*, size_t> nodeIds;
-  size_t nodeId = 0;
-
-  for (const auto &current : nodes) {
-    if (current->getContextType() == PredictionContextType::SINGLETON) {
-      std::string s = std::to_string(insertOrAssignNodeId(nodeIds, nodeId, current.get()));
-      ss << "  s" << s;
-      std::string returnState = std::to_string(current->getReturnState(0));
-      if (current == PredictionContext::EMPTY) {
-        returnState = "$";
-      }
-      ss << " [label=\"" << returnState << "\"];\n";
-      continue;
-    }
-    Ref<const ArrayPredictionContext> arr = std::static_pointer_cast<const ArrayPredictionContext>(current);
-    ss << "  s" << insertOrAssignNodeId(nodeIds, nodeId, arr.get()) << " [shape=box, label=\"" << "[";
-    bool first = true;
-    for (auto inv : arr->returnStates) {
-      if (!first) {
-       ss << ", ";
-      }
-      if (inv == EMPTY_RETURN_STATE) {
-        ss << "$";
-      } else {
-        ss << inv;
-      }
-      first = false;
-    }
-    ss << "]";
-    ss << "\"];\n";
-  }
-
-  for (const auto &current : nodes) {
-    if (current == EMPTY) {
-      continue;
-    }
-    for (size_t i = 0; i < current->size(); i++) {
-      if (!current->getParent(i)) {
-        continue;
-      }
-      ss << "  s" << insertOrAssignNodeId(nodeIds, nodeId, current.get()) << "->" << "s" << insertOrAssignNodeId(nodeIds, nodeId, current->getParent(i).get());
-      if (current->size() > 1) {
-        ss << " [label=\"parent[" << i << "]\"];\n";
-      } else {
-        ss << ";\n";
-      }
-    }
-  }
-
-  ss << "}\n";
-  return ss.str();
-}
-
-// The "visited" map is just a temporary structure to control the retrieval process (which is recursive).
-Ref<const PredictionContext> PredictionContext::getCachedContext(const Ref<const PredictionContext> &context,
-                                                                 PredictionContextCache &contextCache) {
-  std::unordered_map<Ref<const PredictionContext>, Ref<const PredictionContext>> visited;
-  return getCachedContextImpl(context, contextCache, visited);
-}
-
-std::vector<Ref<const PredictionContext>> PredictionContext::getAllContextNodes(const Ref<const PredictionContext> &context) {
-  std::vector<Ref<const PredictionContext>> nodes;
-  std::unordered_set<const PredictionContext*> visited;
-  getAllContextNodesImpl(context, nodes, visited);
-  return nodes;
-}
-
-std::vector<std::string> PredictionContext::toStrings(Recognizer *recognizer, int currentState) const {
-  return toStrings(recognizer, EMPTY, currentState);
-}
-
-std::vector<std::string> PredictionContext::toStrings(Recognizer *recognizer, const Ref<const PredictionContext> &stop, int currentState) const {
-
-  std::vector<std::string> result;
-
-  for (size_t perm = 0; ; perm++) {
-    size_t offset = 0;
-    bool last = true;
-    const PredictionContext *p = this;
-    size_t stateNumber = currentState;
-
-    std::stringstream ss;
-    ss << "[";
-    bool outerContinue = false;
-    while (!p->isEmpty() && p != stop.get()) {
-      size_t index = 0;
-      if (p->size() > 0) {
-        size_t bits = 1;
-        while ((1ULL << bits) < p->size()) {
-          bits++;
-        }
-
-        size_t mask = (1 << bits) - 1;
-        index = (perm >> offset) & mask;
-        last &= index >= p->size() - 1;
-        if (index >= p->size()) {
-          outerContinue = true;
-          break;
-        }
-        offset += bits;
-      }
-
-      if (recognizer != nullptr) {
-        if (ss.tellp() > 1) {
-          // first char is '[', if more than that this isn't the first rule
-          ss << ' ';
-        }
-
-        const ATN &atn = recognizer->getATN();
-        ATNState *s = atn.states[stateNumber];
-        std::string ruleName = recognizer->getRuleNames()[s->ruleIndex];
-        ss << ruleName;
-      } else if (p->getReturnState(index) != EMPTY_RETURN_STATE) {
-        if (!p->isEmpty()) {
-          if (ss.tellp() > 1) {
-            // first char is '[', if more than that this isn't the first rule
-            ss << ' ';
-          }
-
-          ss << p->getReturnState(index);
-        }
-      }
-      stateNumber = p->getReturnState(index);
-      p = p->getParent(index).get();
-    }
-
-    if (outerContinue)
-      continue;
-
-    ss << "]";
-    result.push_back(ss.str());
-
-    if (last) {
-      break;
-    }
-  }
-
-  return result;
-}