C++ TransIDSet::size方法代码示例

/**
 * Regionize a func, so that each node and each arc in its TransCFG is
 * "covered".  A node is covered if any region contains it.  An arc T1->T2
 * is covered if either:
 *
 *   a) T1 and T2 are in the same region R and T2 immediately follows
 *      T1 in R.
 *   b) T2 is the head (first translation) of a region.
 *
 * Basic algorithm:
 *
 *   1) sort nodes in decreasing weight order
 *   2) for each node N:
 *      2.1) if N and all its incoming arcs are covered, then continue
 *      2.2) select a region starting at this node and mark nodes/arcs as
 *           covered appropriately
 */
void regionizeFunc(const Func* func,
                   MCGenerator* mcg,
                   RegionVec& regions) {
  const Timer rf_timer(Timer::regionizeFunc);
  assert(RuntimeOption::EvalJitPGO);
  auto const funcId = func->getFuncId();
  auto const profData = mcg->tx().profData();
  TransCFG cfg(funcId, profData, mcg->tx().getSrcDB(),
               mcg->getJmpToTransIDMap());

  if (Trace::moduleEnabled(HPHP::Trace::pgo, 5)) {
    auto dotFileName = folly::to<std::string>(
      "/tmp/func-cfg-", funcId, ".dot");
    cfg.print(dotFileName, funcId, profData, nullptr);
    FTRACE(5, "regionizeFunc: initial CFG for func {} saved to file {}\n",
           funcId, dotFileName);
  }

  TransCFG::ArcPtrVec   arcs = cfg.arcs();
  std::vector<TransID> nodes = cfg.nodes();

  std::sort(nodes.begin(), nodes.end(),
            [&](TransID tid1, TransID tid2) -> bool {
              if (RuntimeOption::EvalJitPGORegionSelector == "wholecfg") {
                auto bcOff1 = profData->transStartBcOff(tid1);
                auto bcOff2 = profData->transStartBcOff(tid2);
                if (bcOff1 != bcOff2) return bcOff1 < bcOff2;
              }
              if (cfg.weight(tid1) != cfg.weight(tid2)) {
                return cfg.weight(tid1) > cfg.weight(tid2);
              }
              // In case of ties, pick older translations first, in an
              // attempt to start loops at their headers.
              return tid1 < tid2;
            });

  TransCFG::ArcPtrSet coveredArcs;
  TransIDSet          coveredNodes;
  TransIDSet          heads;
  TransIDToRegionMap  headToRegion;
  RegionToTransIDsMap regionToTransIds;
  regions.clear();

  for (auto node : nodes) {
    if (!coveredNodes.count(node) ||
        !allArcsCovered(cfg.inArcs(node),  coveredArcs)) {
      TransID newHead = node;
      FTRACE(6, "regionizeFunc: selecting trace to cover node {}\n", newHead);
      TransIDSet selectedSet;
      TransIDVec selectedVec;
      RegionDescPtr region;
      if (RuntimeOption::EvalJitPGORegionSelector == "hottrace") {
        region = selectHotTrace(newHead, profData, cfg,
                                selectedSet, &selectedVec);
      } else if (RuntimeOption::EvalJitPGORegionSelector == "wholecfg") {
        region = selectWholeCFG(newHead, profData, cfg, selectedSet,
                                &selectedVec);
      } else {
        always_assert(0 && "Invalid value for EvalJitPGORegionSelector");
      }
      FTRACE(6, "regionizeFunc: selected region to cover node {}\n{}\n",
             newHead, show(*region));
      profData->setOptimized(profData->transSrcKey(newHead));
      assert(selectedVec.size() > 0 && selectedVec[0] == newHead);
      regions.push_back(region);
      heads.insert(newHead);
      markCovered(cfg, region, selectedVec, heads, coveredNodes, coveredArcs);
      regionToTransIds[region] = selectedVec;
      headToRegion[newHead] = region;

      FTRACE(6, "regionizeFunc: selected trace: {}\n",
             folly::join(", ", selectedVec));
    }
  }

  assert(coveredNodes.size() == cfg.nodes().size());
  assert(coveredArcs.size() == arcs.size());

  sortRegions(regions, func, cfg, profData, headToRegion, regionToTransIds);

  if (debug && Trace::moduleEnabled(HPHP::Trace::pgo, 5)) {
    FTRACE(5, "\n--------------------------------------------\n"
           "regionizeFunc({}): computed regions:\n", funcId);
//.........这里部分代码省略.........

/**
 * Regionize a func, so that each node and each arc in its TransCFG is
 * "covered".  A node is covered if any region contains it.  An arc T1->T2
 * is covered if either:
 *
 *   a) T1 and T2 are in the same region R and T2 immediately follows
 *      T1 in R.
 *   b) T2 is the head (first translation) of a region.
 *
 * Basic algorithm:
 *
 *   1) sort nodes in decreasing weight order
 *   2) for each node N:
 *      2.1) if N and all its incoming arcs are covered, then continue
 *      2.2) select a region starting at this node and mark nodes/arcs as
 *           covered appropriately
 */
void regionizeFunc(const Func*            func,
                   Transl::TranslatorX64* tx64,
                   RegionVec&             regions) {
  assert(RuntimeOption::EvalJitPGO);
  FuncId funcId = func->getFuncId();
  ProfData* profData = tx64->profData();
  TransCFG cfg(funcId, profData, tx64->getSrcDB(), tx64->getJmpToTransIDMap());

  if (Trace::moduleEnabled(HPHP::Trace::pgo, 5)) {
    string dotFileName = folly::to<string>("/tmp/func-cfg-", funcId, ".dot");
    cfg.print(dotFileName, funcId, profData, nullptr);
    FTRACE(5, "regionizeFunc: initial CFG for func {} saved to file {}\n",
           funcId, dotFileName);
  }

  TransCFG::ArcPtrVec arcs = cfg.arcs();
  vector<TransID>    nodes = cfg.nodes();

  std::sort(nodes.begin(), nodes.end(),
            [&](TransID tid1, TransID tid2) -> bool {
              if (cfg.weight(tid1) != cfg.weight(tid2)) {
                return cfg.weight(tid1) > cfg.weight(tid2);
              }
              // In case of ties, pick older translations first, in an
              // attempt to start loops at their headers.
              return tid1 < tid2;
            });

  TransCFG::ArcPtrSet coveredArcs;
  TransIDSet          coveredNodes;
  TransIDSet          heads;
  TransIDToRegionMap  headToRegion;
  RegionToTransIDsMap regionToTransIds;
  regions.clear();

  for (auto node : nodes) {
    if (!setContains(coveredNodes, node) ||
        !allArcsCovered(cfg.inArcs(node),  coveredArcs)) {
      TransID newHead = node;
      FTRACE(6, "regionizeFunc: selecting trace to cover node {}\n", newHead);
      TransIDSet selectedSet;
      TransIDVec selectedVec;
      RegionDescPtr region = selectHotTrace(newHead, profData, cfg,
                                            selectedSet, &selectedVec);
      profData->setOptimized(profData->transSrcKey(newHead));
      assert(selectedVec.size() > 0 && selectedVec[0] == newHead);
      regions.push_back(region);
      heads.insert(newHead);
      markCovered(cfg, selectedVec, heads, coveredNodes, coveredArcs);
      regionToTransIds[region] = selectedVec;
      headToRegion[newHead] = region;

      FTRACE(6, "regionizeFunc: selected trace: {}\n",
             folly::join(", ", selectedVec));
    }
  }

  assert(coveredNodes.size() == cfg.nodes().size());
  assert(coveredArcs.size() == arcs.size());

  sortRegion(regions, func, cfg, profData, headToRegion, regionToTransIds);

  if (debug && Trace::moduleEnabled(HPHP::Trace::pgo, 5)) {
    FTRACE(5, "\n--------------------------------------------\n"
           "regionizeFunc({}): computed regions:\n", funcId);
    for (auto region : regions) {
      FTRACE(5, "{}\n\n", show(*region));
    }
  }
}