src/share/vm/opto/compile.cpp

rev 5728 : 8029015: PPC64 (part 216): opto: trap based null and range checks

*** 858,867 ****
--- 858,871 ----
  
    _orig_pc_slot =  fixed_slots();
    int next_slot = _orig_pc_slot + (sizeof(address) / VMRegImpl::stack_slot_size);
    set_fixed_slots(next_slot);
  
+   // Compute when to use implicit null checks. Used by matching trap based
+   // nodes and NullCheck optimization.
+   set_allowed_deopt_reasons();
+ 
    // Now generate code
    Code_Gen();
    if (failing())  return;
  
    // Check if we want to skip execution of all compiled code.
*** 946,956 ****
      _number_of_mh_late_inlines(0),
      _inlining_progress(false),
      _inlining_incrementally(false),
      _print_inlining_list(NULL),
      _print_inlining_idx(0),
!     _preserve_jvm_state(0) {
    C = this;
  
  #ifndef PRODUCT
    TraceTime t1(NULL, &_t_totalCompilation, TimeCompiler, false);
    TraceTime t2(NULL, &_t_stubCompilation, TimeCompiler, false);
--- 950,961 ----
      _number_of_mh_late_inlines(0),
      _inlining_progress(false),
      _inlining_incrementally(false),
      _print_inlining_list(NULL),
      _print_inlining_idx(0),
!     _preserve_jvm_state(0),
!     _allowed_reasons(0) {
    C = this;
  
  #ifndef PRODUCT
    TraceTime t1(NULL, &_t_totalCompilation, TimeCompiler, false);
    TraceTime t2(NULL, &_t_stubCompilation, TimeCompiler, false);
*** 3348,3357 ****
--- 3353,3375 ----
      // The coast is clear.
      return false;
    }
  }
  
+ // Compute when not to trap. Used by matching trap based nodes and
+ // NullCheck optimization.
+ void Compile::set_allowed_deopt_reasons() {
+   _allowed_reasons = 0;
+   if (is_method_compilation()) {
+     for (int rs = (int)Deoptimization::Reason_none+1; rs < Compile::trapHistLength; rs++) {
+       assert(rs < BitsPerInt, "recode bit map");
+       if (!too_many_traps((Deoptimization::DeoptReason) rs)) {
+         _allowed_reasons |= nth_bit(rs);
+       }
+     }
+   }
+ }
  
  #ifndef PRODUCT
  //------------------------------verify_graph_edges---------------------------
  // Walk the Graph and verify that there is a one-to-one correspondence
  // between Use-Def edges and Def-Use edges in the graph.