src/share/vm/opto/graphKit.cpp

rev 7793 : 8073315: Enable gcc -Wtype-limits and fix upcoming issues.
Summary: Relevant fixes in blockOffsetTable.cpp, os_linux.cpp, parCardTableModRefBS.cpp.

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 3043,3058 ****
      // for checkcast and aastore the type of superklass should be exact.
      const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
      // We may not have profiling here or it may not help us. If we have
      // a speculative type use it to perform an exact cast.
      ciKlass* spec_obj_type = obj_type->speculative_type();
!     if (spec_obj_type != NULL ||
!         (data != NULL &&
!          // Counter has never been decremented (due to cast failure).
!          // ...This is a reasonable thing to expect.  It is true of
!          // all casts inserted by javac to implement generic types.
!          data->as_CounterData()->count() >= 0)) {
        cast_obj = maybe_cast_profiled_receiver(not_null_obj, tk->klass(), spec_obj_type, safe_for_replace);
        if (cast_obj != NULL) {
          if (failure_control != NULL) // failure is now impossible
            (*failure_control) = top();
          // adjust the type of the phi to the exact klass:
--- 3043,3053 ----
      // for checkcast and aastore the type of superklass should be exact.
      const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
      // We may not have profiling here or it may not help us. If we have
      // a speculative type use it to perform an exact cast.
      ciKlass* spec_obj_type = obj_type->speculative_type();
!     if (spec_obj_type != NULL || (data != NULL)) {
        cast_obj = maybe_cast_profiled_receiver(not_null_obj, tk->klass(), spec_obj_type, safe_for_replace);
        if (cast_obj != NULL) {
          if (failure_control != NULL) // failure is now impossible
            (*failure_control) = top();
          // adjust the type of the phi to the exact klass: