// called for each CodeBlob in the CodeCache
//
// This function filters out nmethods as it is only interested in
// other CodeBlobs. This function also filters out CodeBlobs that have
// a duplicate starting address as previous blobs. This is needed to
// handle the case where multiple stubs are generated into a single
// BufferBlob.

void CodeBlobCollector::do_blob(CodeBlob* cb) {

  {- -------------------------------------------
  (1) nmethod だった場合は, 情報の収集対象としないのですぐにリターン
      ---------------------------------------- -}

      // ignore nmethods
      if (cb->is_nmethod()) {
        return;
      }

  {- -------------------------------------------
  (1) 既に同じ start address のものが登録済みであれば登録しない (ここでリターン)
      (関数の docstring コメントに書いてあるが, 
       複数の stub が一つの BufferBlob に生成されたようなケースで, 重複して登録はしないようにしている模様)
      ---------------------------------------- -}

      // check if this starting address has been seen already - the
      // assumption is that stubs are inserted into the list before the
      // enclosing BufferBlobs.
      address addr = cb->code_begin();
      for (int i=0; i<_global_code_blobs->length(); i++) {
        JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i);
        if (addr == scb->code_begin()) {
          return;
        }
      }

  {- -------------------------------------------
  (1) 新しい JvmtiCodeBlobDesc を作り, 配列内に追加する.
      ---------------------------------------- -}

      // record the CodeBlob details as a JvmtiCodeBlobDesc
      JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end());
      _global_code_blobs->append(scb);
    }