Ejemplo n.º 1
0
/// @brief Update the scattering in a Scop using the scoplib description of
/// the scattering.
bool ScopLib::updateScattering() {
  if (!scoplib)
    return false;

  StatementToIslMapTy *NewScattering = readScattering(PollyScop, scoplib);

  if (!NewScattering)
    return false;

  if (!D->isValidScattering(NewScattering)) {
    freeStmtToIslMap(NewScattering);
    errs() << "OpenScop file contains a scattering that changes the "
      << "dependences. Use -disable-polly-legality to continue anyways\n";
    return false;
  }

  for (Scop::iterator SI = PollyScop->begin(), SE = PollyScop->end(); SI != SE;
       ++SI) {
    ScopStmt *Stmt = *SI;

    if (NewScattering->find(Stmt) != NewScattering->end())
      Stmt->setScattering(isl_map_copy((*NewScattering)[Stmt]));
  }

  freeStmtToIslMap(NewScattering);
  return true;
}
Ejemplo n.º 2
0
bool JSONImporter::runOnScop(Scop &S) {
  const Dependences &D =
      getAnalysis<DependenceInfo>().getDependences(Dependences::AL_Statement);
  const DataLayout &DL = S.getFunction().getParent()->getDataLayout();

  std::string FileName = ImportDir + "/" + getFileName(S);

  std::string FunctionName = S.getFunction().getName();
  errs() << "Reading JScop '" << S.getNameStr() << "' in function '"
         << FunctionName << "' from '" << FileName << "'.\n";
  ErrorOr<std::unique_ptr<MemoryBuffer>> result =
      MemoryBuffer::getFile(FileName);
  std::error_code ec = result.getError();

  if (ec) {
    errs() << "File could not be read: " << ec.message() << "\n";
    return false;
  }

  Json::Reader reader;
  Json::Value jscop;

  bool parsingSuccessful = reader.parse(result.get()->getBufferStart(), jscop);

  if (!parsingSuccessful) {
    errs() << "JSCoP file could not be parsed\n";
    return false;
  }

  isl_set *OldContext = S.getContext();
  isl_set *NewContext =
      isl_set_read_from_str(S.getIslCtx(), jscop["context"].asCString());

  for (unsigned i = 0; i < isl_set_dim(OldContext, isl_dim_param); i++) {
    isl_id *id = isl_set_get_dim_id(OldContext, isl_dim_param, i);
    NewContext = isl_set_set_dim_id(NewContext, isl_dim_param, i, id);
  }

  isl_set_free(OldContext);
  S.setContext(NewContext);

  StatementToIslMapTy NewSchedule;

  int index = 0;

  for (ScopStmt &Stmt : S) {
    Json::Value schedule = jscop["statements"][index]["schedule"];
    isl_map *m = isl_map_read_from_str(S.getIslCtx(), schedule.asCString());
    isl_space *Space = Stmt.getDomainSpace();

    // Copy the old tuple id. This is necessary to retain the user pointer,
    // that stores the reference to the ScopStmt this schedule belongs to.
    m = isl_map_set_tuple_id(m, isl_dim_in,
                             isl_space_get_tuple_id(Space, isl_dim_set));
    for (unsigned i = 0; i < isl_space_dim(Space, isl_dim_param); i++) {
      isl_id *id = isl_space_get_dim_id(Space, isl_dim_param, i);
      m = isl_map_set_dim_id(m, isl_dim_param, i, id);
    }
    isl_space_free(Space);
    NewSchedule[&Stmt] = m;
    index++;
  }

  if (!D.isValidSchedule(S, &NewSchedule)) {
    errs() << "JScop file contains a schedule that changes the "
           << "dependences. Use -disable-polly-legality to continue anyways\n";
    for (StatementToIslMapTy::iterator SI = NewSchedule.begin(),
                                       SE = NewSchedule.end();
         SI != SE; ++SI)
      isl_map_free(SI->second);
    return false;
  }

  auto ScheduleMap = isl_union_map_empty(S.getParamSpace());
  for (ScopStmt &Stmt : S) {
    if (NewSchedule.find(&Stmt) != NewSchedule.end())
      ScheduleMap = isl_union_map_add_map(ScheduleMap, NewSchedule[&Stmt]);
    else
      ScheduleMap = isl_union_map_add_map(ScheduleMap, Stmt.getSchedule());
  }

  S.setSchedule(ScheduleMap);

  int statementIdx = 0;
  for (ScopStmt &Stmt : S) {
    int memoryAccessIdx = 0;
    for (MemoryAccess *MA : Stmt) {
      Json::Value accesses = jscop["statements"][statementIdx]["accesses"]
                                  [memoryAccessIdx]["relation"];
      isl_map *newAccessMap =
          isl_map_read_from_str(S.getIslCtx(), accesses.asCString());
      isl_map *currentAccessMap = MA->getAccessRelation();

      if (isl_map_dim(newAccessMap, isl_dim_param) !=
          isl_map_dim(currentAccessMap, isl_dim_param)) {
        errs() << "JScop file changes the number of parameter dimensions\n";
        isl_map_free(currentAccessMap);
        isl_map_free(newAccessMap);
        return false;
      }

      isl_id *OutId = isl_map_get_tuple_id(currentAccessMap, isl_dim_out);
      newAccessMap = isl_map_set_tuple_id(newAccessMap, isl_dim_out, OutId);

      if (MA->isArrayKind()) {
        // We keep the old alignment, thus we cannot allow accesses to memory
        // locations that were not accessed before if the alignment of the
        // access is not the default alignment.
        bool SpecialAlignment = true;
        if (LoadInst *LoadI = dyn_cast<LoadInst>(MA->getAccessInstruction())) {
          SpecialAlignment =
              DL.getABITypeAlignment(LoadI->getType()) != LoadI->getAlignment();
        } else if (StoreInst *StoreI =
                       dyn_cast<StoreInst>(MA->getAccessInstruction())) {
          SpecialAlignment =
              DL.getABITypeAlignment(StoreI->getValueOperand()->getType()) !=
              StoreI->getAlignment();
        }

        if (SpecialAlignment) {
          isl_set *newAccessSet = isl_map_range(isl_map_copy(newAccessMap));
          isl_set *currentAccessSet =
              isl_map_range(isl_map_copy(currentAccessMap));
          bool isSubset = isl_set_is_subset(newAccessSet, currentAccessSet);
          isl_set_free(newAccessSet);
          isl_set_free(currentAccessSet);

          if (!isSubset) {
            errs() << "JScop file changes the accessed memory\n";
            isl_map_free(currentAccessMap);
            isl_map_free(newAccessMap);
            return false;
          }
        }
      }

      // We need to copy the isl_ids for the parameter dimensions to the new
      // map. Without doing this the current map would have different
      // ids then the new one, even though both are named identically.
      for (unsigned i = 0; i < isl_map_dim(currentAccessMap, isl_dim_param);
           i++) {
        isl_id *id = isl_map_get_dim_id(currentAccessMap, isl_dim_param, i);
        newAccessMap = isl_map_set_dim_id(newAccessMap, isl_dim_param, i, id);
      }

      // Copy the old tuple id. This is necessary to retain the user pointer,
      // that stores the reference to the ScopStmt this access belongs to.
      isl_id *Id = isl_map_get_tuple_id(currentAccessMap, isl_dim_in);
      newAccessMap = isl_map_set_tuple_id(newAccessMap, isl_dim_in, Id);

      if (!isl_map_has_equal_space(currentAccessMap, newAccessMap)) {
        errs() << "JScop file contains access function with incompatible "
               << "dimensions\n";
        isl_map_free(currentAccessMap);
        isl_map_free(newAccessMap);
        return false;
      }

      auto NewAccessDomain = isl_map_domain(isl_map_copy(newAccessMap));
      auto CurrentAccessDomain = isl_map_domain(isl_map_copy(currentAccessMap));

      NewAccessDomain =
          isl_set_intersect_params(NewAccessDomain, S.getContext());
      CurrentAccessDomain =
          isl_set_intersect_params(CurrentAccessDomain, S.getContext());

      if (isl_set_is_subset(CurrentAccessDomain, NewAccessDomain) ==
          isl_bool_false) {
        errs() << "Mapping not defined for all iteration domain elements\n";
        isl_set_free(CurrentAccessDomain);
        isl_set_free(NewAccessDomain);
        isl_map_free(currentAccessMap);
        isl_map_free(newAccessMap);
        return false;
      }

      isl_set_free(CurrentAccessDomain);
      isl_set_free(NewAccessDomain);

      if (!isl_map_is_equal(newAccessMap, currentAccessMap)) {
        // Statistics.
        ++NewAccessMapFound;
        newAccessStrings.push_back(accesses.asCString());
        MA->setNewAccessRelation(newAccessMap);
      } else {
        isl_map_free(newAccessMap);
      }
      isl_map_free(currentAccessMap);
      memoryAccessIdx++;
    }
    statementIdx++;
  }

  return false;
}