private void addPhiConstraints(
      CGNode node, ControlFlowGraph<SSAInstruction, ISSABasicBlock> cfg, ISSABasicBlock b) {

    // visit each phi instruction in each successor block
    for (Iterator<? extends IBasicBlock> sbs = cfg.getSuccNodes(b); sbs.hasNext(); ) {
      ISSABasicBlock sb = (ISSABasicBlock) sbs.next();
      if (sb.isExitBlock()) {
        // an optimization based on invariant that exit blocks should have no
        // phis.
        continue;
      }
      int n = 0;
      // set n to be whichPred(this, sb);
      for (Iterator<? extends IBasicBlock> back = cfg.getPredNodes(sb); back.hasNext(); n++) {
        if (back.next() == b) {
          break;
        }
      }
      assert n < cfg.getPredNodeCount(sb);
      for (Iterator<SSAPhiInstruction> phis = sb.iteratePhis(); phis.hasNext(); ) {
        SSAPhiInstruction phi = phis.next();
        if (phi == null) {
          continue;
        }
        PointerKey def = heapModel.getPointerKeyForLocal(node, phi.getDef());
        if (phi.getUse(n) > 0) {
          PointerKey use = heapModel.getPointerKeyForLocal(node, phi.getUse(n));
          addNode(def);
          addNode(use);
          addEdge(def, use);
        }
        // }
        // }
      }
    }
  }
Пример #2
0
  /** Taken from com.ibm.wala.viz.PDFViewUtil */
  @Override
  public String getText(Object element) {
    if (element instanceof BasicBlock) {
      BasicBlock bb = (BasicBlock) element;
      IR ir = irView.getIR();

      StringBuilder result = new StringBuilder();

      int start = bb.getFirstInstructionIndex();
      int end = bb.getLastInstructionIndex();

      result.append("BB").append(bb.getNumber());

      if (bb.isEntryBlock()) {
        result.append(" (en)\n");
      } else if (bb.isExitBlock()) {
        result.append(" (ex)\n");
      }
      if (bb instanceof ExceptionHandlerBasicBlock) {
        result.append("<Handler>");
      }
      result.append("\n");

      for (Iterator<SSAPhiInstruction> it = bb.iteratePhis(); it.hasNext(); ) {
        SSAPhiInstruction phi = it.next();
        if (phi != null) {
          result.append(phi.toString(ir.getSymbolTable())).append("\n");
        }
      }
      if (bb instanceof ExceptionHandlerBasicBlock) {
        ExceptionHandlerBasicBlock ebb = (ExceptionHandlerBasicBlock) bb;
        SSAGetCaughtExceptionInstruction s = ebb.getCatchInstruction();
        if (s != null) {
          result.append(s.toString(ir.getSymbolTable())).append("\n");
        } else {
          result.append(" No catch instruction. Unreachable?\n");
        }
      }

      SSAInstruction[] instructions = ir.getInstructions();
      IMethod method = ir.getMethod();
      for (int j = start; j <= end; j++) {
        if (instructions[j] != null) {
          String x;
          int sourceLineNum = method.getLineNumber(j);
          x =
              String.format(
                  j + " [L%03d] " + instructions[j].toString(ir.getSymbolTable()), sourceLineNum);
          String padded = String.format("%1$-35s", x);
          result.append(padded);
          result.append("\n");
          result.append(SSAValuesToLocalVariables(instructions[j], j, ir));
          result.append("\n");
        }
      }
      for (Iterator<SSAPiInstruction> it = bb.iteratePis(); it.hasNext(); ) {
        SSAPiInstruction pi = it.next();
        if (pi != null) {
          result.append("           " + pi.toString(ir.getSymbolTable())).append("\n");
        }
      }
      return result.toString();
    }
    if (element instanceof EntityConnectionData) {
      return "\n";
    }
    return "";
  }