C++ PEdge::IfAnnotation方法代码示例

void BlockSummary::GetAssumedBits(BlockMemory *mcfg, PPoint end_point,
                                  Vector<AssumeInfo> *assume_list)
{
  BlockId *id = mcfg->GetId();
  BlockCFG *cfg = mcfg->GetCFG();

  BlockSummary *sum = GetBlockSummary(id);

  const Vector<Bit*> *assumes = sum->GetAssumes();
  size_t assume_count = VectorSize<Bit*>(assumes);

  // pull in assumptions from the summary for mcfg. in some cases these
  // assumptions won't be useful, e.g. describing the state at exit
  // for functions. for now we're just adding all of them though. TODO: fix.
  for (size_t ind = 0; ind < assume_count; ind++) {
    Bit *bit = assumes->At(ind);
    bit->IncRef(assume_list);

    AssumeInfo info;
    info.bit = bit;
    assume_list->PushBack(info);
  }

  sum->DecRef();

  Vector<BlockCFG*> *annot_list = BodyAnnotCache.Lookup(id->Function());

  // add assumes at function entry for any preconditions.

  if (id->Kind() == B_Function) {
    for (size_t ind = 0; annot_list && ind < annot_list->Size(); ind++) {
      BlockCFG *annot_cfg = annot_list->At(ind);

      if (annot_cfg->GetAnnotationKind() != AK_Precondition &&
          annot_cfg->GetAnnotationKind() != AK_PreconditionAssume)
        continue;

      Bit *bit = BlockMemory::GetAnnotationBit(annot_cfg);
      if (!bit) continue;

      annot_cfg->IncRef(assume_list);
      bit->IncRef(assume_list);

      AssumeInfo info;
      info.annot = annot_cfg;
      info.bit = bit;
      assume_list->PushBack(info);
    }
  }

  // add assumptions from points within the block.

  for (size_t pind = 0; pind < cfg->GetPointAnnotationCount(); pind++) {
    PointAnnotation pann = cfg->GetPointAnnotation(pind);
    if (end_point && pann.point >= end_point)
      continue;

    BlockCFG *annot_cfg = GetAnnotationCFG(pann.annot);
    if (!annot_cfg) continue;

    Assert(annot_cfg->GetAnnotationKind() != AK_AssertRuntime);

    if (Bit *bit = BlockMemory::GetAnnotationBit(annot_cfg)) {
      // get the annotation bit in terms of block entry.
      Bit *point_bit = NULL;
      mcfg->TranslateBit(TRK_Point, pann.point, bit, &point_bit);
      point_bit->MoveRef(&point_bit, assume_list);

      annot_cfg->IncRef(assume_list);

      AssumeInfo info;
      info.annot = annot_cfg;
      info.point = pann.point;
      info.bit = point_bit;
      assume_list->PushBack(info);
    }

    annot_cfg->DecRef();
  }

  // add assumptions from annotation edges within the block, invariants
  // on values accessed by the block, and from the summaries of any callees.

  for (size_t eind = 0; eind < cfg->GetEdgeCount(); eind++) {
    PEdge *edge = cfg->GetEdge(eind);
    PPoint point = edge->GetSource();

    if (end_point && point >= end_point)
      continue;

    InvariantAssumeVisitor visitor(mcfg, point, assume_list);
    edge->DoVisit(&visitor);

    if (PEdgeAnnotation *nedge = edge->IfAnnotation()) {
      // add an assumption for this annotation.
      BlockCFG *annot_cfg = GetAnnotationCFG(nedge->GetAnnotationId());
      if (!annot_cfg) continue;

      Bit *bit = BlockMemory::GetAnnotationBit(annot_cfg);

//.........这里部分代码省略.........

void InferSummaries(const Vector<BlockSummary*> &summary_list)
{
  static BaseTimer infer_timer("infer_summaries");
  Timer _timer(&infer_timer);

  if (summary_list.Empty())
    return;

  Variable *function = summary_list[0]->GetId()->BaseVar();
  Vector<BlockCFG*> *annot_list = BodyAnnotCache.Lookup(function->GetName());

  // all traces which might refer to the result of pointer arithmetic.
  Vector<Exp*> arithmetic_list;
  ArithmeticEscape escape(function, arithmetic_list);

  // initial pass over the CFGs to get traces used in pointer arithmetic.
  for (size_t ind = 0; ind < summary_list.Size(); ind++) {
    BlockSummary *sum = summary_list[ind];

    BlockCFG *cfg = sum->GetMemory()->GetCFG();
    for (size_t eind = 0; eind < cfg->GetEdgeCount(); eind++) {
      PEdge *edge = cfg->GetEdge(eind);

      if (PEdgeAssign *assign_edge = edge->IfAssign()) {
        Exp *left = assign_edge->GetLeftSide();
        Exp *right = assign_edge->GetRightSide();
        ProcessArithmeticAssign(&escape, cfg->GetId(), left, right);
      }
    }
  }

  for (size_t ind = 0; ind < summary_list.Size(); ind++) {
    BlockSummary *sum = summary_list[ind];
    BlockMemory *mcfg = sum->GetMemory();
    BlockCFG *cfg = mcfg->GetCFG();

    // accumulate all the assertions at points in the CFG.
    Vector<AssertInfo> asserts;

    // add assertions at function exit for any postconditions.
    if (cfg->GetId()->Kind() == B_Function) {
      for (size_t aind = 0; annot_list && aind < annot_list->Size(); aind++) {
        BlockCFG *annot_cfg = annot_list->At(aind);

        if (annot_cfg->GetAnnotationKind() != AK_Postcondition)
          continue;
        if (Bit *bit = BlockMemory::GetAnnotationBit(annot_cfg)) {
          AssertInfo info;
          info.kind = ASK_Annotation;
          info.cls = ASC_Check;
          info.point = cfg->GetExitPoint();
          info.bit = bit;
          asserts.PushBack(info);
        }
      }
    }

    // add assertions for any point annotations within the CFG.
    for (size_t pind = 0; pind < cfg->GetPointAnnotationCount(); pind++) {
      PointAnnotation pann = cfg->GetPointAnnotation(pind);
      BlockCFG *annot_cfg = GetAnnotationCFG(pann.annot);
      if (!annot_cfg) continue;

      if (annot_cfg->GetAnnotationKind() != AK_Assert)
        continue;

      if (Bit *bit = BlockMemory::GetAnnotationBit(annot_cfg)) {
        AssertInfo info;
        info.kind = ASK_Annotation;
        info.cls = ASC_Check;
        info.point = pann.point;
        info.bit = bit;
        asserts.PushBack(info);
      }
    }

    for (size_t eind = 0; eind < cfg->GetEdgeCount(); eind++) {
      PEdge *edge = cfg->GetEdge(eind);
      PPoint point = edge->GetSource();

      if (PEdgeAnnotation *nedge = edge->IfAnnotation()) {
        // add an assertion for this annotation if it not an assume.
        BlockCFG *annot_cfg = GetAnnotationCFG(nedge->GetAnnotationId());
        if (!annot_cfg) continue;

        if (annot_cfg->GetAnnotationKind() != AK_Assert &&
            annot_cfg->GetAnnotationKind() != AK_AssertRuntime) {
          continue;
        }

        if (Bit *bit = BlockMemory::GetAnnotationBit(annot_cfg)) {
          AssertInfo info;
          info.kind = (annot_cfg->GetAnnotationKind() == AK_Assert)
            ? ASK_Annotation : ASK_AnnotationRuntime;
          info.cls = ASC_Check;
          info.point = point;
          info.bit = bit;
          asserts.PushBack(info);
        }
      }
//.........这里部分代码省略.........