JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef CPU_SPARC_STUBROUTINES_SPARC_HPP
#define CPU_SPARC_STUBROUTINES_SPARC_HPP

// This file holds the platform specific parts of the StubRoutines
// definition. See stubRoutines.hpp for a description on how to
// extend it.


// So unfortunately c2 will call with a pc from a frame object
// (already adjusted) and a raw pc (unadjusted), so we need to check both.
// It didn't use to be like this before adapter removal.
static bool returns_to_call_stub(address return_pc)   {
  return ((return_pc + frame::pc_return_offset) == _call_stub_return_address) ||
          (return_pc == _call_stub_return_address );
}

enum /* platform_dependent_constants */ {
  // %%%%%%%% May be able to shrink this a lot
  code_size1 = 20000,           // simply increase if too small (assembler will crash if too small)
  code_size2 = 29000            // simply increase if too small (assembler will crash if too small)
};

class Sparc {
 friend class StubGenerator;

 private:
  static address _test_stop_entry;
  static address _stop_subroutine_entry;
  static address _flush_callers_register_windows_entry;

  static address _partial_subtype_check;
  // masks and table for CRC32
  static uint64_t _crc_by128_masks[];
  static juint    _crc_table[];
  static juint    _crc32c_table[];

 public:
  // test assembler stop routine by setting registers
  static void (*test_stop_entry()) ()                     { return CAST_TO_FN_PTR(void (*)(void), _test_stop_entry); }

  // a subroutine for debugging assembler code
  static address stop_subroutine_entry_address()          { return (address)&_stop_subroutine_entry; }

  // flushes (all but current) register window

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