| /* |
| * Copyright (c) 2000, 2013, 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. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "opto/regalloc.hpp" |
| |
| static const int NodeRegsOverflowSize = 200; |
| |
| void (*PhaseRegAlloc::_alloc_statistics[MAX_REG_ALLOCATORS])(); |
| int PhaseRegAlloc::_num_allocators = 0; |
| #ifndef PRODUCT |
| int PhaseRegAlloc::_total_framesize = 0; |
| int PhaseRegAlloc::_max_framesize = 0; |
| #endif |
| |
| PhaseRegAlloc::PhaseRegAlloc( uint unique, PhaseCFG &cfg, |
| Matcher &matcher, |
| void (*pr_stats)() ): |
| Phase(Register_Allocation), _cfg(cfg), _matcher(matcher), |
| _node_oops(Thread::current()->resource_area()), |
| _node_regs(0), |
| _node_regs_max_index(0), |
| _framesize(0xdeadbeef) |
| { |
| int i; |
| |
| for (i=0; i < _num_allocators; i++) { |
| if (_alloc_statistics[i] == pr_stats) |
| return; |
| } |
| assert((_num_allocators + 1) < MAX_REG_ALLOCATORS, "too many register allocators"); |
| _alloc_statistics[_num_allocators++] = pr_stats; |
| } |
| |
| |
| //------------------------------reg2offset------------------------------------- |
| int PhaseRegAlloc::reg2offset_unchecked( OptoReg::Name reg ) const { |
| // Slots below _max_in_arg_stack_reg are offset by the entire frame. |
| // Slots above _max_in_arg_stack_reg are frame_slots and are not offset. |
| int slot = (reg < _matcher._new_SP) |
| ? reg - OptoReg::stack0() + _framesize |
| : reg - _matcher._new_SP; |
| // Note: We use the direct formula (reg - SharedInfo::stack0) instead of |
| // OptoReg::reg2stack(reg), in order to avoid asserts in the latter |
| // function. This routine must remain unchecked, so that dump_frame() |
| // can do its work undisturbed. |
| // %%% not really clear why reg2stack would assert here |
| |
| return slot*VMRegImpl::stack_slot_size; |
| } |
| |
| int PhaseRegAlloc::reg2offset( OptoReg::Name reg ) const { |
| |
| // Not allowed in the out-preserve area. |
| // In-preserve area is allowed so Intel can fetch the return pc out. |
| assert( reg < _matcher._old_SP || |
| (reg >= OptoReg::add(_matcher._old_SP,C->out_preserve_stack_slots()) && |
| reg < _matcher._in_arg_limit) || |
| reg >= OptoReg::add(_matcher._new_SP, C->out_preserve_stack_slots()) || |
| // Allow return_addr in the out-preserve area. |
| reg == _matcher.return_addr(), |
| "register allocated in a preserve area" ); |
| return reg2offset_unchecked( reg ); |
| } |
| |
| //------------------------------offset2reg------------------------------------- |
| OptoReg::Name PhaseRegAlloc::offset2reg(int stk_offset) const { |
| int slot = stk_offset / jintSize; |
| int reg = (slot < (int) _framesize) |
| ? slot + _matcher._new_SP |
| : OptoReg::stack2reg(slot) - _framesize; |
| assert(stk_offset == reg2offset((OptoReg::Name) reg), |
| "offset2reg does not invert properly"); |
| return (OptoReg::Name) reg; |
| } |
| |
| //------------------------------set_oop---------------------------------------- |
| void PhaseRegAlloc::set_oop( const Node *n, bool is_an_oop ) { |
| if( is_an_oop ) { |
| _node_oops.set(n->_idx); |
| } |
| } |
| |
| //------------------------------is_oop----------------------------------------- |
| bool PhaseRegAlloc::is_oop( const Node *n ) const { |
| return _node_oops.test(n->_idx) != 0; |
| } |
| |
| // Allocate _node_regs table with at least "size" elements |
| void PhaseRegAlloc::alloc_node_regs(int size) { |
| _node_regs_max_index = size + (size >> 1) + NodeRegsOverflowSize; |
| _node_regs = NEW_RESOURCE_ARRAY( OptoRegPair, _node_regs_max_index ); |
| // We assume our caller will fill in all elements up to size-1, so |
| // only the extra space we allocate is initialized here. |
| for( uint i = size; i < _node_regs_max_index; ++i ) |
| _node_regs[i].set_bad(); |
| } |
| |
| #ifndef PRODUCT |
| void |
| PhaseRegAlloc::print_statistics() { |
| tty->print_cr("Total frameslots = %d, Max frameslots = %d", _total_framesize, _max_framesize); |
| int i; |
| |
| for (i=0; i < _num_allocators; i++) { |
| _alloc_statistics[i](); |
| } |
| } |
| #endif |