1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/opto/regalloc.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,130 @@
1.4 +/*
1.5 + * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "opto/regalloc.hpp"
1.30 +
1.31 +static const int NodeRegsOverflowSize = 200;
1.32 +
1.33 +void (*PhaseRegAlloc::_alloc_statistics[MAX_REG_ALLOCATORS])();
1.34 +int PhaseRegAlloc::_num_allocators = 0;
1.35 +#ifndef PRODUCT
1.36 +int PhaseRegAlloc::_total_framesize = 0;
1.37 +int PhaseRegAlloc::_max_framesize = 0;
1.38 +#endif
1.39 +
1.40 +PhaseRegAlloc::PhaseRegAlloc( uint unique, PhaseCFG &cfg,
1.41 + Matcher &matcher,
1.42 + void (*pr_stats)() ):
1.43 + Phase(Register_Allocation), _cfg(cfg), _matcher(matcher),
1.44 + _node_oops(Thread::current()->resource_area()),
1.45 + _node_regs(0),
1.46 + _node_regs_max_index(0),
1.47 + _framesize(0xdeadbeef)
1.48 +{
1.49 + int i;
1.50 +
1.51 + for (i=0; i < _num_allocators; i++) {
1.52 + if (_alloc_statistics[i] == pr_stats)
1.53 + return;
1.54 + }
1.55 + assert((_num_allocators + 1) < MAX_REG_ALLOCATORS, "too many register allocators");
1.56 + _alloc_statistics[_num_allocators++] = pr_stats;
1.57 +}
1.58 +
1.59 +
1.60 +//------------------------------reg2offset-------------------------------------
1.61 +int PhaseRegAlloc::reg2offset_unchecked( OptoReg::Name reg ) const {
1.62 + // Slots below _max_in_arg_stack_reg are offset by the entire frame.
1.63 + // Slots above _max_in_arg_stack_reg are frame_slots and are not offset.
1.64 + int slot = (reg < _matcher._new_SP)
1.65 + ? reg - OptoReg::stack0() + _framesize
1.66 + : reg - _matcher._new_SP;
1.67 + // Note: We use the direct formula (reg - SharedInfo::stack0) instead of
1.68 + // OptoReg::reg2stack(reg), in order to avoid asserts in the latter
1.69 + // function. This routine must remain unchecked, so that dump_frame()
1.70 + // can do its work undisturbed.
1.71 + // %%% not really clear why reg2stack would assert here
1.72 +
1.73 + return slot*VMRegImpl::stack_slot_size;
1.74 +}
1.75 +
1.76 +int PhaseRegAlloc::reg2offset( OptoReg::Name reg ) const {
1.77 +
1.78 + // Not allowed in the out-preserve area.
1.79 + // In-preserve area is allowed so Intel can fetch the return pc out.
1.80 + assert( reg < _matcher._old_SP ||
1.81 + (reg >= OptoReg::add(_matcher._old_SP,C->out_preserve_stack_slots()) &&
1.82 + reg < _matcher._in_arg_limit) ||
1.83 + reg >= OptoReg::add(_matcher._new_SP, C->out_preserve_stack_slots()) ||
1.84 + // Allow return_addr in the out-preserve area.
1.85 + reg == _matcher.return_addr(),
1.86 + "register allocated in a preserve area" );
1.87 + return reg2offset_unchecked( reg );
1.88 +}
1.89 +
1.90 +//------------------------------offset2reg-------------------------------------
1.91 +OptoReg::Name PhaseRegAlloc::offset2reg(int stk_offset) const {
1.92 + int slot = stk_offset / jintSize;
1.93 + int reg = (slot < (int) _framesize)
1.94 + ? slot + _matcher._new_SP
1.95 + : OptoReg::stack2reg(slot) - _framesize;
1.96 + assert(stk_offset == reg2offset((OptoReg::Name) reg),
1.97 + "offset2reg does not invert properly");
1.98 + return (OptoReg::Name) reg;
1.99 +}
1.100 +
1.101 +//------------------------------set_oop----------------------------------------
1.102 +void PhaseRegAlloc::set_oop( const Node *n, bool is_an_oop ) {
1.103 + if( is_an_oop ) {
1.104 + _node_oops.set(n->_idx);
1.105 + }
1.106 +}
1.107 +
1.108 +//------------------------------is_oop-----------------------------------------
1.109 +bool PhaseRegAlloc::is_oop( const Node *n ) const {
1.110 + return _node_oops.test(n->_idx) != 0;
1.111 +}
1.112 +
1.113 +// Allocate _node_regs table with at least "size" elements
1.114 +void PhaseRegAlloc::alloc_node_regs(int size) {
1.115 + _node_regs_max_index = size + (size >> 1) + NodeRegsOverflowSize;
1.116 + _node_regs = NEW_RESOURCE_ARRAY( OptoRegPair, _node_regs_max_index );
1.117 + // We assume our caller will fill in all elements up to size-1, so
1.118 + // only the extra space we allocate is initialized here.
1.119 + for( uint i = size; i < _node_regs_max_index; ++i )
1.120 + _node_regs[i].set_bad();
1.121 +}
1.122 +
1.123 +#ifndef PRODUCT
1.124 +void
1.125 +PhaseRegAlloc::print_statistics() {
1.126 + tty->print_cr("Total frameslots = %d, Max frameslots = %d", _total_framesize, _max_framesize);
1.127 + int i;
1.128 +
1.129 + for (i=0; i < _num_allocators; i++) {
1.130 + _alloc_statistics[i]();
1.131 + }
1.132 +}
1.133 +#endif
