src/share/vm/ci/ciMethodData.cpp

rev 5927 : 8031752: Failed speculative optimizations should be reattempted when root of compilation is different
Summary: support for speculative traps that keep track of the root of the compilation in which a trap occurs.
Reviewed-by: kvn, twisti
rev 5929 : 8035841: assert(dp_src->tag() == dp_dst->tag()) failed: should be same tags 1 != 0 at ciMethodData.cpp:90
Summary: concurrent update of traps with construction of ciMethodData
Reviewed-by: kvn, twisti

*** 85,96 ****
    DataLayout* dp_src  = mdo->extra_data_base();
    DataLayout* end_src = mdo->extra_data_limit();
    DataLayout* dp_dst  = extra_data_base();
    for (;; dp_src = MethodData::next_extra(dp_src), dp_dst = MethodData::next_extra(dp_dst)) {
      assert(dp_src < end_src, "moved past end of extra data");
!     assert(dp_src->tag() == dp_dst->tag(), err_msg("should be same tags %d != %d", dp_src->tag(), dp_dst->tag()));
!     switch(dp_src->tag()) {
      case DataLayout::speculative_trap_data_tag: {
        ciSpeculativeTrapData* data_dst = new ciSpeculativeTrapData(dp_dst);
        SpeculativeTrapData* data_src = new SpeculativeTrapData(dp_src);
        data_dst->translate_from(data_src);
        break;
--- 85,97 ----
    DataLayout* dp_src  = mdo->extra_data_base();
    DataLayout* end_src = mdo->extra_data_limit();
    DataLayout* dp_dst  = extra_data_base();
    for (;; dp_src = MethodData::next_extra(dp_src), dp_dst = MethodData::next_extra(dp_dst)) {
      assert(dp_src < end_src, "moved past end of extra data");
!     // New traps in the MDO can be added as we translate the copy so
!     // look at the entries in the copy.
!     switch(dp_dst->tag()) {
      case DataLayout::speculative_trap_data_tag: {
        ciSpeculativeTrapData* data_dst = new ciSpeculativeTrapData(dp_dst);
        SpeculativeTrapData* data_src = new SpeculativeTrapData(dp_src);
        data_dst->translate_from(data_src);
        break;
*** 100,110 ****
      case DataLayout::no_tag:
      case DataLayout::arg_info_data_tag:
        // An empty slot or ArgInfoData entry marks the end of the trap data
        return;
      default:
!       fatal(err_msg("bad tag = %d", dp_src->tag()));
      }
    }
  }
  
  void ciMethodData::load_data() {
--- 101,111 ----
      case DataLayout::no_tag:
      case DataLayout::arg_info_data_tag:
        // An empty slot or ArgInfoData entry marks the end of the trap data
        return;
      default:
!       fatal(err_msg("bad tag = %d", dp_dst->tag()));
      }
    }
  }
  
  void ciMethodData::load_data() {