hotspot/src/cpu/sparc/vm/stubRoutines_sparc.hpp
author twisti
Fri, 13 Feb 2009 09:09:35 -0800
changeset 2031 24e034f56dcb
parent 1 489c9b5090e2
child 5050 47ecd86932ce
permissions -rw-r--r--
6800154: Add comments to long_by_long_mulhi() for better understandability Summary: This patch adds a comment pointing to the Hacker's Delight version of the algorithm plus a verbatim copy of it. Furthermore it adds inline comments. Reviewed-by: kvn, jrose
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/*
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 * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// This file holds the platform specific parts of the StubRoutines
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// definition. See stubRoutines.hpp for a description on how to
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// extend it.
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// So unfortunately c2 will call with a pc from a frame object
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// (already adjusted) and a raw pc (unadjusted), so we need to check both.
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// It didn't use to be like this before adapter removal.
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static bool returns_to_call_stub(address return_pc)   {
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  return ((return_pc + frame::pc_return_offset) == _call_stub_return_address) ||
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          (return_pc == _call_stub_return_address );
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}
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enum /* platform_dependent_constants */ {
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  // %%%%%%%% May be able to shrink this a lot
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  code_size1 = 20000,                                        // simply increase if too small (assembler will crash if too small)
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  code_size2 = 20000                                         // simply increase if too small (assembler will crash if too small)
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};
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class Sparc {
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 friend class StubGenerator;
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 public:
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  enum { nof_instance_allocators = 10 };
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  // allocator lock values
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  enum {
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    unlocked = 0,
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    locked   = 1
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  };
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  enum {
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    v8_oop_lock_ignore_bits = 2,
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    v8_oop_lock_bits = 4,
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    nof_v8_oop_lock_cache_entries = 1 << (v8_oop_lock_bits+v8_oop_lock_ignore_bits),
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    v8_oop_lock_mask = right_n_bits(v8_oop_lock_bits),
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    v8_oop_lock_mask_in_place = v8_oop_lock_mask << v8_oop_lock_ignore_bits
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  };
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  static int _v8_oop_lock_cache[nof_v8_oop_lock_cache_entries];
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 private:
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  static address _test_stop_entry;
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  static address _stop_subroutine_entry;
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  static address _flush_callers_register_windows_entry;
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  static int _atomic_memory_operation_lock;
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  static address _partial_subtype_check;
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 public:
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  // %%% global lock for everyone who needs to use atomic_compare_and_exchange
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  // %%% or atomic_increment -- should probably use more locks for more
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  // %%% scalability-- for instance one for each eden space or group of
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  // address of the lock for atomic_compare_and_exchange
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  static int* atomic_memory_operation_lock_addr() { return &_atomic_memory_operation_lock; }
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  // accessor and mutator for _atomic_memory_operation_lock
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  static int atomic_memory_operation_lock() { return _atomic_memory_operation_lock; }
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  static void set_atomic_memory_operation_lock(int value) { _atomic_memory_operation_lock = value; }
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  // test assembler stop routine by setting registers
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  static void (*test_stop_entry()) ()                     { return CAST_TO_FN_PTR(void (*)(void), _test_stop_entry); }
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  // a subroutine for debugging assembler code
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  static address stop_subroutine_entry_address()          { return (address)&_stop_subroutine_entry; }
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  // flushes (all but current) register window
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  static intptr_t* (*flush_callers_register_windows_func())() { return CAST_TO_FN_PTR(intptr_t* (*)(void), _flush_callers_register_windows_entry); }
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  static address partial_subtype_check()                  { return _partial_subtype_check; }
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};