hotspot/src/share/vm/opto/regalloc.cpp
author goetz
Thu, 21 Nov 2013 19:00:57 -0800
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parent 15241 87d217c2d183
child 22872 b6902ee5bc8d
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8028767: PPC64: (part 121): smaller shared changes needed to build C2 Summary: smaller shared changes required to build the C2 compiler on PPC64. Reviewed-by: kvn
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/*
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 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "opto/regalloc.hpp"
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static const int NodeRegsOverflowSize = 200;
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void (*PhaseRegAlloc::_alloc_statistics[MAX_REG_ALLOCATORS])();
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int PhaseRegAlloc::_num_allocators = 0;
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#ifndef PRODUCT
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int PhaseRegAlloc::_total_framesize = 0;
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int PhaseRegAlloc::_max_framesize = 0;
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#endif
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PhaseRegAlloc::PhaseRegAlloc( uint unique, PhaseCFG &cfg,
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                              Matcher &matcher,
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                              void (*pr_stats)() ):
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               Phase(Register_Allocation), _cfg(cfg), _matcher(matcher),
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               _node_oops(Thread::current()->resource_area()),
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               _node_regs(0),
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               _node_regs_max_index(0),
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               _framesize(0xdeadbeef)
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{
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    int i;
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    for (i=0; i < _num_allocators; i++) {
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        if (_alloc_statistics[i] == pr_stats)
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            return;
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    }
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    assert((_num_allocators + 1) < MAX_REG_ALLOCATORS, "too many register allocators");
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    _alloc_statistics[_num_allocators++] = pr_stats;
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}
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//------------------------------reg2offset-------------------------------------
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int PhaseRegAlloc::reg2offset_unchecked( OptoReg::Name reg ) const {
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  // Slots below _max_in_arg_stack_reg are offset by the entire frame.
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  // Slots above _max_in_arg_stack_reg are frame_slots and are not offset.
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  int slot = (reg < _matcher._new_SP)
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    ? reg - OptoReg::stack0() + _framesize
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    : reg - _matcher._new_SP;
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  // Note:  We use the direct formula (reg - SharedInfo::stack0) instead of
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  // OptoReg::reg2stack(reg), in order to avoid asserts in the latter
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  // function.  This routine must remain unchecked, so that dump_frame()
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  // can do its work undisturbed.
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  // %%% not really clear why reg2stack would assert here
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  return slot*VMRegImpl::stack_slot_size;
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}
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int PhaseRegAlloc::reg2offset( OptoReg::Name reg ) const {
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  // Not allowed in the out-preserve area.
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  // In-preserve area is allowed so Intel can fetch the return pc out.
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  assert( reg <  _matcher._old_SP ||
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          (reg >= OptoReg::add(_matcher._old_SP,C->out_preserve_stack_slots()) &&
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           reg <  _matcher._in_arg_limit) ||
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          reg >=  OptoReg::add(_matcher._new_SP, C->out_preserve_stack_slots()) ||
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          // Allow return_addr in the out-preserve area.
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          reg == _matcher.return_addr(),
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          "register allocated in a preserve area" );
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  return reg2offset_unchecked( reg );
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}
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//------------------------------offset2reg-------------------------------------
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OptoReg::Name PhaseRegAlloc::offset2reg(int stk_offset) const {
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  int slot = stk_offset / jintSize;
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  int reg = (slot < (int) _framesize)
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    ? slot + _matcher._new_SP
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    : OptoReg::stack2reg(slot) - _framesize;
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  assert(stk_offset == reg2offset((OptoReg::Name) reg),
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         "offset2reg does not invert properly");
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  return (OptoReg::Name) reg;
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}
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//------------------------------set_oop----------------------------------------
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void PhaseRegAlloc::set_oop( const Node *n, bool is_an_oop ) {
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  if( is_an_oop ) {
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    _node_oops.set(n->_idx);
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  }
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}
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//------------------------------is_oop-----------------------------------------
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bool PhaseRegAlloc::is_oop( const Node *n ) const {
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  return _node_oops.test(n->_idx) != 0;
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}
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// Allocate _node_regs table with at least "size" elements
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void PhaseRegAlloc::alloc_node_regs(int size) {
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  _node_regs_max_index = size + (size >> 1) + NodeRegsOverflowSize;
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  _node_regs = NEW_RESOURCE_ARRAY( OptoRegPair, _node_regs_max_index );
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  // We assume our caller will fill in all elements up to size-1, so
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  // only the extra space we allocate is initialized here.
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  for( uint i = size; i < _node_regs_max_index; ++i )
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    _node_regs[i].set_bad();
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}
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#ifndef PRODUCT
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void
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PhaseRegAlloc::print_statistics() {
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  tty->print_cr("Total frameslots = %d, Max frameslots = %d", _total_framesize, _max_framesize);
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  int i;
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  for (i=0; i < _num_allocators; i++) {
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    _alloc_statistics[i]();
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  }
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}
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#endif