Mercurial > hg > truffle
view src/share/vm/opto/regalloc.cpp @ 15583:d331b7c3d7c4
[single-pass-iter] start of evolution towards a node iterator less memory-hungry
author | Miguel Garcia <miguel.m.garcia@oracle.com> |
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date | Fri, 09 May 2014 16:22:54 +0200 |
parents | 4ca6dc0799b6 |
children | 89152779163c |
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/* * Copyright (c) 2000, 2010, 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()), "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